The valve is used in the mineral processing plant. The pipeline necessary equipment for drying for throttling, various pipelines. But the valve flange connection is very important, it is related to the pipeline leakage of the problem, the flange link depends on whether the leak is a flange gasket.
At present, the valve commonly used flange gaskets have the following several forms, including the flange clearance is also different:
1, flexible graphite composite gasket
The middle of the flexible graphite composite gasket is 0.5mm thick carbon steel plate or stainless steel plate, the upper layer of the steel plate is covered with a flexible graphite layer, with a total thickness of about 3mm. This gasket compression has a certain resilience, and not because of the compression force is too large and lead to the destruction of the gasket, so there is a certain gap in the flange.
2, rubber asbestos gasket
The rubber asbestos gasket is suitable for low pressure and water system. The deformation of the gasket is small and the resilience is poor. If used at high temperature conditions, the bolt is affected by temperature and elongation, the gasket can not be compensated by its resilience to compensate for the gap, and only increase the pressure to keep the flange seal. The gasket is used as a seal, and the flange must have a clearance.
It is also due to the use of rubber asbestos gasket for many years, making some use of units regardless of the flange gasket material and the form of what is required to ask the flange must be a gap. In fact, it is now used in the petrochemical company process pipeline valve has basically no longer use the rubber asbestos gasket.
3, metal corrugated gasket
Metal corrugated gasket by the thickness of about 0.8mm steel by pressing or rolling on surface and formation of corrugated gasket. When the gasket is pressed, the middle flange is sealed by the deformation of the wave crest. Because the gasket is very thin, the thickness of the deformation is only about 0.5mm, so there is no obvious gap between the flange, basically belong to the no gap.
4, spiral wound gasket
In the valve link, use the winding gasket to make the flange no clearance, may appear on the outside of the gap, but there is no gap between the actual. The sealing effect of spiral wound gasket is compressed by a valve body spigot depth control and the realization of Pina gasket. The compression rate of spiral wound gaskets is generally 0.8 ~ 1.2mm. In the structural design of pressing gasket, spiral wound gasket thickness higher body spigot depth of 0.8 ~ 1.2mm, which close to the two plane flange, the gasket is in pressure and volume within the prescribed scope. In the condition, which changes with the temperature, and the gasket is reduced by bolt elongation than the pressure seal, can cushion the elasticity of compensation, so as to ensure no leakage in the flange gasket.
The amount of compression gasket can also be used bolt fastening force control, the purpose is not only to ensure that the gasket has sufficient sealing pressure and not to overload, in order to guarantee the resilience of gasket. If the fastening force does not control the bolt, and the force is too large, the gasket will lose resilience due to plastic deformation, or even destroy the gasket structure. The amount of pressure and the methods used to control the bolt screwing force to control the gasket, the structure design can give Spiralwound gasket to deformation a large degree of freedom. This structure can have flange clearance.
www.wel-water-pump.com
2016年11月11日星期五
2016年11月10日星期四
Structure of stainless steel automatic coupling device for submersible sewage pump
An overview of automatic coupling device
Automatic coupling device automatic docking a submersible pump outlet flange and the water outlet pipeline system, composed of a submersible pump outlet flange, flange and pipe coupling additional inlet flange on both sides of the seat, additional coupling flange and the water outlet pipe seat inlet flange each have a pair of wedge and wedge card point position near the horizontal center line flange. When the submersible pump water falling from above, additional coupling flange on both sides of the wedge and seat card outlet pipe inlet flange on both sides of the wedge card card together, in the role of the dignity of the pump and the submersible inclined wedge clamp, two flange tightly together, like two sides of a flange with two bolted, hydraulic submersible pump then it does not open the flange and a large number of Water Leakage. When the submersible pump from the pool to lift up to two when the wedge card can conveniently disengaged along the slope, so as to realize the function of automatic coupling device. It can facilitate the automatic installation and disassembly of submersible pumps, to solve the problem of a large number of water leakage between the two flanges, so as to save energy.
Automatic coupling device size chart
Advantages of automatic coupling device of GAK type submersible sewage pump:
1 after using the automatic coupling device, the installation and maintenance is convenient. In the absence of automatic coupling device under the condition of fixed installation, such as pump fault maintenance personnel need to unscrew the screw pump lifting water, repair, or other small pump to pump the water down perfect maintenance, if the water is dirty, it would be difficult for people to go to the next, then the overhaul had great difficulty. The automatic coupling device but the installation of GAK type submersible sewage pump, need lifting, people may not need to unscrew the screw water, the water pump can directly improve, after repairing down along the guide rail can realize sealing pump and pipeline, water pump and normal operation. Small, free installation of sewage pump, sewage pump large are generally equipped with automatic coupling device can be automatically installed, the installation and maintenance very convenient.
2 GAK type submersible sewage pump automatic coupling device compact structure, small area. Sewage pump into the liquid as a result, it can be directly installed in the sewage pool, without the construction of a dedicated pump pumps and machines used to install, can save a lot of land and infrastructure costs.
The composition of automatic coupling device of GAK type submersible sewage pump:
Automatic coupling device of GAK type submersible sewage pump, which comprises a coupler, coupling flange, a guide rod, the upper fixed plate in the coupling base and the coupling slider on the contact surface provided with an annular groove, the groove is tightly fixed with soft sealing pad. With the structure, the coupling contact coupling and coupling the base slide surface is the annular sealing groove is firmly sealed. The coupling device, stainless steel stainless steel automatic coupling device, submersible pump, sewage pump coupler coupling device
GAK submersible sewage pump automatic coupling device in general according to the different use of the environment, I developed a cast iron submersible sewage pump automatic coupling device and stainless steel submersible sewage pump automatic coupling device. The guide rail of the automatic coupling device can also be customized into a welded pipe, seamless steel pipe and stainless steel pipe. When lifting, similar to the chain guide can also be customized steel and stainless steel chain guide chain guidance.
Automatic coupling device automatic docking a submersible pump outlet flange and the water outlet pipeline system, composed of a submersible pump outlet flange, flange and pipe coupling additional inlet flange on both sides of the seat, additional coupling flange and the water outlet pipe seat inlet flange each have a pair of wedge and wedge card point position near the horizontal center line flange. When the submersible pump water falling from above, additional coupling flange on both sides of the wedge and seat card outlet pipe inlet flange on both sides of the wedge card card together, in the role of the dignity of the pump and the submersible inclined wedge clamp, two flange tightly together, like two sides of a flange with two bolted, hydraulic submersible pump then it does not open the flange and a large number of Water Leakage. When the submersible pump from the pool to lift up to two when the wedge card can conveniently disengaged along the slope, so as to realize the function of automatic coupling device. It can facilitate the automatic installation and disassembly of submersible pumps, to solve the problem of a large number of water leakage between the two flanges, so as to save energy.
Automatic coupling device size chart
Advantages of automatic coupling device of GAK type submersible sewage pump:
1 after using the automatic coupling device, the installation and maintenance is convenient. In the absence of automatic coupling device under the condition of fixed installation, such as pump fault maintenance personnel need to unscrew the screw pump lifting water, repair, or other small pump to pump the water down perfect maintenance, if the water is dirty, it would be difficult for people to go to the next, then the overhaul had great difficulty. The automatic coupling device but the installation of GAK type submersible sewage pump, need lifting, people may not need to unscrew the screw water, the water pump can directly improve, after repairing down along the guide rail can realize sealing pump and pipeline, water pump and normal operation. Small, free installation of sewage pump, sewage pump large are generally equipped with automatic coupling device can be automatically installed, the installation and maintenance very convenient.
2 GAK type submersible sewage pump automatic coupling device compact structure, small area. Sewage pump into the liquid as a result, it can be directly installed in the sewage pool, without the construction of a dedicated pump pumps and machines used to install, can save a lot of land and infrastructure costs.
The composition of automatic coupling device of GAK type submersible sewage pump:
Automatic coupling device of GAK type submersible sewage pump, which comprises a coupler, coupling flange, a guide rod, the upper fixed plate in the coupling base and the coupling slider on the contact surface provided with an annular groove, the groove is tightly fixed with soft sealing pad. With the structure, the coupling contact coupling and coupling the base slide surface is the annular sealing groove is firmly sealed. The coupling device, stainless steel stainless steel automatic coupling device, submersible pump, sewage pump coupler coupling device
GAK submersible sewage pump automatic coupling device in general according to the different use of the environment, I developed a cast iron submersible sewage pump automatic coupling device and stainless steel submersible sewage pump automatic coupling device. The guide rail of the automatic coupling device can also be customized into a welded pipe, seamless steel pipe and stainless steel pipe. When lifting, similar to the chain guide can also be customized steel and stainless steel chain guide chain guidance.
Reasons and methods of filling water before starting the centrifugal pump
Centrifugal pump before the start, the first to be filled with water, in order to discharge the air inside the pump casing. The working principle of the centrifugal pump, the impeller rotates, the water by centrifugal force and is thrown to the outer edge of the impeller, the impeller center of the vacuum, water is sucked, forming a continuous working process of water pump. If you start the pump body is filled with water, but is filled with air, the air density is much less than the density of water, the impeller to rotate at the same speed, the centrifugal force generated by the centrifugal force of the air will be far less than water. This will gather in the impeller center, so that the impeller center can not form a sufficient vacuum to prevent water intake, affecting the formation of the continuous process of water pumps. Therefore, the centrifugal pump before starting, must first be filled with water, the air discharged in the body, in order to maintain the normal operation of the pump.
The centrifugal pump to the water pump and a water inlet pipe filled with water before, otherwise the pump is not pumping work. After the start of the centrifugal pump does not water, often because the air in the pump is not discharged, the water is not filled due to.
Before starting the pump, the water tank filled with water for sealing. Pump starts to pump water from the vacuum tank, the tank water level resulted in the formation of a certain degree of vacuum in the tank, into the water in the pool will be under the influence of the atmospheric pressure through the inlet into the tank, thus forming the water cycle, the pump started running. The water filling method has the following advantages: small hydraulic loss, high efficiency of pumping station, low labor intensity of technical personnel, easy to start, and is conducive to the realization of the automatic control of pump unit.
There are two kinds of main water filling method before startup: one is by the end of valve assembly with water valve, check valve, installed in the inlet pipe imports, the disadvantage of this method is that valve head loss is bigger, affect the efficiency of the pump device; the other is not the end of valve with water, the greatest advantage of this method is energy saving relative to the valve of the pumping station, can save 10% ~ 15%.
The centrifugal pump to the water pump and a water inlet pipe filled with water before, otherwise the pump is not pumping work. After the start of the centrifugal pump does not water, often because the air in the pump is not discharged, the water is not filled due to.
Before starting the pump, the water tank filled with water for sealing. Pump starts to pump water from the vacuum tank, the tank water level resulted in the formation of a certain degree of vacuum in the tank, into the water in the pool will be under the influence of the atmospheric pressure through the inlet into the tank, thus forming the water cycle, the pump started running. The water filling method has the following advantages: small hydraulic loss, high efficiency of pumping station, low labor intensity of technical personnel, easy to start, and is conducive to the realization of the automatic control of pump unit.
There are two kinds of main water filling method before startup: one is by the end of valve assembly with water valve, check valve, installed in the inlet pipe imports, the disadvantage of this method is that valve head loss is bigger, affect the efficiency of the pump device; the other is not the end of valve with water, the greatest advantage of this method is energy saving relative to the valve of the pumping station, can save 10% ~ 15%.
2016年11月9日星期三
Problems and correction methods of mechanical seal for submersible sewage pump
Usually, in the process of fluid sealing occasions there is pollution, mainly adopts the contact type ordinary double mechanical seal, the seal between the two fluid assisted by blocking system is higher than the obstruction sealing fluid medium pressure injection pressure, prevent leakage to the outside of the sealed medium. But in practical application, often due to various reasons of failure and can effectively prevent the leakage of the sealed medium, especially for conveying fluid medium containing solid particles, the frequent pumping process and easy to stop, the sealing reliability is far from satisfactory. The sewage discharge pump of a single plant of a Petrochemical Industries Co is not ideal because of the sealing effect, and the leakage of the pump is an urgent problem to be solved.
1, submersible sewage pump mechanical sealing technology parameters of the pump model is WQ30-35-7.5, in normal work, the inlet pressure is close to the normal pressure, the outlet pressure is 0.55mpa, the conveying temperature is room temperature. The mechanical seal is a double end face with a multi spring balance structure, the inner diameter of the sealing surface is 35.2mm, the outside diameter is 44.2mm, the width of the end face is 4.5mm, and the balance diameter is 36.8mm.
2, under the conditions of the existing problems
(1) isolation fluid pressure is less than the sealed medium pressure in order to ensure the sealing function of the double face theory, isolation fluid pressure must be higher than the sealed medium pressure 0.1-0.15mpa, to prevent the leakage of the medium containing certain toxicity. But in practical engineering, the isolation fluid pressure is not greater than 0.3MPa, less than the pressure of the sealing medium 0.55mpa, so the use of sealing effect is not ideal.
(2) transport medium containing solid particles due to a large number of sewage pump is put in process unit discharges to various process fluid in the tank (including a large number of cooling water) timing transported to the sewage treatment station for purification treatment, impurity class which contains a certain proportion of the solid particles, easily into the sealing between severe abrasive wear the early failure of the seal. If the isolated fluid auxiliary system can not work, the pressure of the isolated fluid is less than the pressure of the sealed medium, the solid particles will enter the inner seal between the end face, the probability of failure is greatly increased.
(3) in the frequent start stop state when the liquid in the tank after the completion of the sewage pump, the pump will stop automatically when the tank fluid to the specified level, the pump is automatically switched to the running state, it is because the pump is in frequent on-off state, so that the mechanical seal appears periodic instability dry friction state, this is one of the main causes of the frequent failure of seal.
(4) pump because the pump is prone to frequent on-off state, when the liquid level of tank drops to a certain extent, it is easy to make the pump evacuation phenomenon, vibration and noise intensity, this phenomenon will inevitably lead to seal the unstable state, the possibility of seal failure greatly increased. Based on the above analysis that the double end common contacting mechanical seal sealing principle because of its particularity restrictions and conditions, and ensure the long period operation of the seal in this difficult environment. Moreover, in a stable condition, although the use of the double seal or seal series can basically eliminate the leakage of the sealed medium, but seal auxiliary system is complex, operating costs increased, and the reliability of auxiliary system directly affects the use effect of sealing.
3, mechanical seal of the submersible sewage pump transformation due to conic mechanical seal is especially suitable for containing solid suspended pumping equipment, so the sealing surface to cone seal. The static ring material as tetrafuoroethylene ring material, stainless steel, tungsten carbide spray cone. Its main features are as follows.
(1) mechanical seal ring cone is a conical ring, with static ring wear, contact the bus length of L growth, the static ring diameter increases.
(2) the sealing contact surface generatrix length is very short (stable at the beginning of operation for the 0.3-0.5mm), so the contact surface temperature difference is small, low temperature rise, reducing the degree of adhesive wear. The static ring has a large compression cross section, and the pressure deformation is small.
(3) the sealing sleeve and the moving ring have a certain float, so the sealing cover can always keep a good contact state, and the suspended particles in the medium are not easy to enter the sealing surface. The direction of the leakage of the medium is in a certain angle with the centrifugal force direction, which is favorable for reducing the leakage.
1, submersible sewage pump mechanical sealing technology parameters of the pump model is WQ30-35-7.5, in normal work, the inlet pressure is close to the normal pressure, the outlet pressure is 0.55mpa, the conveying temperature is room temperature. The mechanical seal is a double end face with a multi spring balance structure, the inner diameter of the sealing surface is 35.2mm, the outside diameter is 44.2mm, the width of the end face is 4.5mm, and the balance diameter is 36.8mm.
2, under the conditions of the existing problems
(1) isolation fluid pressure is less than the sealed medium pressure in order to ensure the sealing function of the double face theory, isolation fluid pressure must be higher than the sealed medium pressure 0.1-0.15mpa, to prevent the leakage of the medium containing certain toxicity. But in practical engineering, the isolation fluid pressure is not greater than 0.3MPa, less than the pressure of the sealing medium 0.55mpa, so the use of sealing effect is not ideal.
(2) transport medium containing solid particles due to a large number of sewage pump is put in process unit discharges to various process fluid in the tank (including a large number of cooling water) timing transported to the sewage treatment station for purification treatment, impurity class which contains a certain proportion of the solid particles, easily into the sealing between severe abrasive wear the early failure of the seal. If the isolated fluid auxiliary system can not work, the pressure of the isolated fluid is less than the pressure of the sealed medium, the solid particles will enter the inner seal between the end face, the probability of failure is greatly increased.
(3) in the frequent start stop state when the liquid in the tank after the completion of the sewage pump, the pump will stop automatically when the tank fluid to the specified level, the pump is automatically switched to the running state, it is because the pump is in frequent on-off state, so that the mechanical seal appears periodic instability dry friction state, this is one of the main causes of the frequent failure of seal.
(4) pump because the pump is prone to frequent on-off state, when the liquid level of tank drops to a certain extent, it is easy to make the pump evacuation phenomenon, vibration and noise intensity, this phenomenon will inevitably lead to seal the unstable state, the possibility of seal failure greatly increased. Based on the above analysis that the double end common contacting mechanical seal sealing principle because of its particularity restrictions and conditions, and ensure the long period operation of the seal in this difficult environment. Moreover, in a stable condition, although the use of the double seal or seal series can basically eliminate the leakage of the sealed medium, but seal auxiliary system is complex, operating costs increased, and the reliability of auxiliary system directly affects the use effect of sealing.
3, mechanical seal of the submersible sewage pump transformation due to conic mechanical seal is especially suitable for containing solid suspended pumping equipment, so the sealing surface to cone seal. The static ring material as tetrafuoroethylene ring material, stainless steel, tungsten carbide spray cone. Its main features are as follows.
(1) mechanical seal ring cone is a conical ring, with static ring wear, contact the bus length of L growth, the static ring diameter increases.
(2) the sealing contact surface generatrix length is very short (stable at the beginning of operation for the 0.3-0.5mm), so the contact surface temperature difference is small, low temperature rise, reducing the degree of adhesive wear. The static ring has a large compression cross section, and the pressure deformation is small.
(3) the sealing sleeve and the moving ring have a certain float, so the sealing cover can always keep a good contact state, and the suspended particles in the medium are not easy to enter the sealing surface. The direction of the leakage of the medium is in a certain angle with the centrifugal force direction, which is favorable for reducing the leakage.
2016年11月8日星期二
Calculation method of pump shaft power and efficiency
H: pump head, unit M, Q flow, unit is M /H within.P as fand, efficiency of pump for the shaft power, the unit KW. is P= P GQH/1000 shaft power within the pump (KW), the P =1000KG/M3, G=9.8
Proportion of units for the KG/M3, the flow of units for the M3/H, head of the unit for the M, 1KG=9.8 Newton
P= specific gravity * flow * head *9.8 Newton /KG
=KG/M3*M3/H*M*9.8 Newton /KG
=9.8 Newton *M/3600 seconds
= Newton *M/367 seconds
= w /367
The above is the calculation of the water power, the power of the shaft and then divided by the efficiency of the following:
Shaft power for the X, motor power for the P, K for the coefficient (the reciprocal efficiency)
Motor power P=X*K (K in the X does not have different values at the same time)
X = 22, K=1.25
22<X = 55, K=1.15
K=1.00 55<X
Pump shaft power calculation formula
Flow H, head Q:M3/H: m H2O, efficiency N:%
Slurry density KG/M3 A
Axis power KW N
N=H*Q*A*G/ (N*3600)
Motor power should also consider the transmission efficiency and safety factor. General direct connection take 1, belt take 0.96, safety factor 1.2
The calculation formula of the efficiency of the pump: Pump effective power and shaft power ratio: within =PE/P
Pump power usually refers to the input power, that is, the original motivation to the pump shaft power, it is also known as the shaft power, with P said.
The effective power is the product of the pump head and mass flow and gravity acceleration.
PE= P G QH (W) or PE= QH/1000 (KW).
P: pump liquid density (KG/M3)
Gamma: pump liquid gamma = P G severe (N/ M3)
G: gravity acceleration (M/S)
The mass flow rate of QM= Q P (T/H or KG/S)
Introduction of pump efficiency
What is the efficiency of the pump? How is the formula?
Ratio of effective power and shaft power of pump. Within =X/P
Pump power usually refers to the input power, that is, the original motivation to the pump shaft power, it is also known as the shaft power, with P said.
The effective power is the product of the pump head and mass flow and gravity acceleration.
PE= G or PE= W QH P QH/1000 (KW).
P: pump liquid density (KG/M3)
Gamma: pump liquid gamma = P G severe (N/ M3)
G: gravity acceleration (M/S)
The quality of QM= Q or KG/S T/H P flow
Proportion of units for the KG/M3, the flow of units for the M3/H, head of the unit for the M, 1KG=9.8 Newton
P= specific gravity * flow * head *9.8 Newton /KG
=KG/M3*M3/H*M*9.8 Newton /KG
=9.8 Newton *M/3600 seconds
= Newton *M/367 seconds
= w /367
The above is the calculation of the water power, the power of the shaft and then divided by the efficiency of the following:
Shaft power for the X, motor power for the P, K for the coefficient (the reciprocal efficiency)
Motor power P=X*K (K in the X does not have different values at the same time)
X = 22, K=1.25
22<X = 55, K=1.15
K=1.00 55<X
Pump shaft power calculation formula
Flow H, head Q:M3/H: m H2O, efficiency N:%
Slurry density KG/M3 A
Axis power KW N
N=H*Q*A*G/ (N*3600)
Motor power should also consider the transmission efficiency and safety factor. General direct connection take 1, belt take 0.96, safety factor 1.2
The calculation formula of the efficiency of the pump: Pump effective power and shaft power ratio: within =PE/P
Pump power usually refers to the input power, that is, the original motivation to the pump shaft power, it is also known as the shaft power, with P said.
The effective power is the product of the pump head and mass flow and gravity acceleration.
PE= P G QH (W) or PE= QH/1000 (KW).
P: pump liquid density (KG/M3)
Gamma: pump liquid gamma = P G severe (N/ M3)
G: gravity acceleration (M/S)
The mass flow rate of QM= Q P (T/H or KG/S)
Introduction of pump efficiency
What is the efficiency of the pump? How is the formula?
Ratio of effective power and shaft power of pump. Within =X/P
Pump power usually refers to the input power, that is, the original motivation to the pump shaft power, it is also known as the shaft power, with P said.
The effective power is the product of the pump head and mass flow and gravity acceleration.
PE= G or PE= W QH P QH/1000 (KW).
P: pump liquid density (KG/M3)
Gamma: pump liquid gamma = P G severe (N/ M3)
G: gravity acceleration (M/S)
The quality of QM= Q or KG/S T/H P flow
2016年11月7日星期一
Submersible sewage pump how to maintain how to maintain good use
In order to ensure the normal use and service life of submersible sewage pump, regular inspection and maintenance should be carried out:
1, to replace the sealing ring: long-term use in water media, the gap between the impeller and the sealing ring can be increased, resulting in decreased pump flow and efficiency, should turn off the switch, lift the pump, remove the bottom cover, remove the sealing ring, according to the actual size of the impeller mouth ring sealing ring, the gap is generally about 0.5mm.
No 2, submersible sewage pump long-term, cleaning should be lifted and placed in ventilated and dry place, pay attention to antifreeze. If placed in water, at least 15 days running 30min (not dry mill), in order to check its function and adaptability.
3, cable inspection at least once a year, if damaged, please give the replacement.
4, at least once a year to check the motor insulation and fastening screws, if the motor insulation, please contact the company's after-sales service department, if the fastening screw loose, please re tighten.
5, submersible sewage pump in the factory has been injected into the appropriate amount of oil, used to lubricate the mechanical seal, the oil should be checked once a year. If there is water in the oil, should be let go, change the oil, the replacement gasket, tighten the plug. Three weeks later, it is necessary to re check, if the oil and emulsion, the mechanical seal should be checked, if necessary, should be replaced (with the company's after-sales service department). Note: oil is 32 mechanical oil.
6, submersible sewage pump operation after the failure, please according to the given troubleshooting method to eliminate, will be resolved, and can not determine the cause, not to dismantle the repair, should contact the customer service department immediately.
1, to replace the sealing ring: long-term use in water media, the gap between the impeller and the sealing ring can be increased, resulting in decreased pump flow and efficiency, should turn off the switch, lift the pump, remove the bottom cover, remove the sealing ring, according to the actual size of the impeller mouth ring sealing ring, the gap is generally about 0.5mm.
No 2, submersible sewage pump long-term, cleaning should be lifted and placed in ventilated and dry place, pay attention to antifreeze. If placed in water, at least 15 days running 30min (not dry mill), in order to check its function and adaptability.
3, cable inspection at least once a year, if damaged, please give the replacement.
4, at least once a year to check the motor insulation and fastening screws, if the motor insulation, please contact the company's after-sales service department, if the fastening screw loose, please re tighten.
5, submersible sewage pump in the factory has been injected into the appropriate amount of oil, used to lubricate the mechanical seal, the oil should be checked once a year. If there is water in the oil, should be let go, change the oil, the replacement gasket, tighten the plug. Three weeks later, it is necessary to re check, if the oil and emulsion, the mechanical seal should be checked, if necessary, should be replaced (with the company's after-sales service department). Note: oil is 32 mechanical oil.
6, submersible sewage pump operation after the failure, please according to the given troubleshooting method to eliminate, will be resolved, and can not determine the cause, not to dismantle the repair, should contact the customer service department immediately.
Modification of the lubrication mode of stainless steel centrifugal pump
Stainless steel centrifugal pump rolling bearing lubrication is mainly to reduce the friction power consumption, reduce wear rate, but also play a cooling, dust, rust and vibration absorption and so on. Well equipment lubrication is to ensure the normal operation of equipment. Reduce equipment wear, prevent equipment accidents, reduce power consumption, extend the repair cycle and the effective measures of life.
This type of water pump rolling bearings lubricated by 30# (winter) or 40# (summer) mechanical lubrication. Due to the design of dynamic seal leakage is very serious, not only caused a lot of waste oil, bearing damage, and environmental pollution, is not conducive to the safe operation of equipment and civilized production. In a few years of work, in order to solve this problem, a number of small changes to small leather.
A way to transform the process of lubrication
[felt seal change to single seal]
The original bearing box seal with felt seal. The leak is very serious, each pump fuel consumption is about 300kg/a, caused a lot of waste oil, a thick layer of oil on the ground.
In order to change the status of oil spill, modified felt seal skeleton seal, as follows:
The bearing box and cover for processing, the car out of a deep hole diameter of 65mm, 12mm, fit a specification for the seal 45mm * 60MM * 12mm.
The blanket is removed, the seal with a hammer gently into it, and the correct installation.
After reformation, the equipment in normal operation, the vibration displacement is about 0.04mm, the bearing temperature is about 50 degrees C, each pump in oil consumption is only about 50kg. Keep the house clean, prevent due to lack of oil caused by bearing, shaft damage accident, make the operation of the equipment in good condition.
A single skeleton oil seal is changed to double skeleton oil seal
In order to reduce the amount of leakage is more, according to the structure of the bearing box cover, and put forward the reform scheme, the bearing box end cover for processing hole diameter 65mm. Change the single layer skeleton oil seal to the double-layer skeleton oil seal:
Test run shows that this method is very effective in preventing the leakage of oil in the short term. But after 6 months of continuous operation, due to the wear of the skeleton oil seal will increase the amount of leakage.
Two, skeleton oil seal defects
The felt seal to seal, the use of 4A, although the effect is good, but there are obvious defects.
In practical work, because the seal life is short, often need to change, in the replacement of skeleton oil seal, all equipment needs to be disintegrated, on the one hand to increase the labor intensity of workers, on the other hand, equipment overhaul process, the damage may cause the impeller, bearings and other parts of the economy, does not meet the requirements of equipment management, but if you do not change the oil seal, causing leakage, is not conducive to sealing, but also directly affect the bearing life. In short, the practice has proved that: the skeleton oil seal does not completely solve the problem of oil leakage of the bearing box.
Three, lubricating grease instead of lubricating oil
At present, but also cheap and no leakage of the sealing device has not, and some sealing effect is good, but the price is expensive, the economy is not feasible. After investigation and research, the decision to bold test - to replace the lubricating oil with grease lubrication.
[transformation method]
Taking into account the pump shaft power is only 18.5kw, the flow rate is only 200m3/h; pump speed is 1450r/min, the line speed is 3.4m/s. From the above two points, it is feasible to use grease lubrication.
The concrete method is as follows
The oil in the oil discharged, cleaning of the bearing box.
The end cover of the two ends of the bearing box and the oil discharging hole are opened to eliminate the air in the box body.
The butter gun grease filling hole to the bearing box by filling, add grease from both ends of cover and the oil drain hole extrusion, as fill, and tighten the bearing end cover and the oil drain hole plug wire. Hand turning, the grease evenly distributed in the box body.
Start the pump, open the outlet valve of the pump operation, under normal circumstances, to monitor the temperature of the bearing and the situation of oil pumps.
Grease oil is good, without changing the pump in normal operation, the temperature monitoring data and vibration monitoring data can be seen, with grease instead of lubricating oil is feasible, and can be popularized and applied in the same type of pump.
[lubricating grease lubrication effect]
Grease is not easy to leak, is conducive to the lubrication of pump bearings, to ensure safe and stable operation of the pump, greatly reducing the amount of fuel and the number of times. Not only saving, but also reduce the labor intensity of workers. Specifically speaking:
The cost of oil saving. The use of lubricating oil per pump consumption of 9kg/a, the cost of 63 yuan /a. And the oil consumption in the framework of the skeleton oil seal in good condition for 4kg/ months, the cost of 200 yuan /a. Each pump can save 137 yuan /a, greatly reducing the cost of lubrication.
Reduce maintenance costs. Seal the average life span of 4 months, in order to replace the seal, the annual need for inspection and repair 3 times, instead of lithium grease lubrication, reduce labor costs. Material cost, mechanical cost, and avoid the damage caused by equipment parts in the process of maintenance.
The operation period of equipment is prolonged. From vibration. Temperature and other aspects of the monitoring, the use of grease sealing performance is good, bearings running well, extend the service life of the bearing.
Improve the job environment.
This type of water pump rolling bearings lubricated by 30# (winter) or 40# (summer) mechanical lubrication. Due to the design of dynamic seal leakage is very serious, not only caused a lot of waste oil, bearing damage, and environmental pollution, is not conducive to the safe operation of equipment and civilized production. In a few years of work, in order to solve this problem, a number of small changes to small leather.
A way to transform the process of lubrication
[felt seal change to single seal]
The original bearing box seal with felt seal. The leak is very serious, each pump fuel consumption is about 300kg/a, caused a lot of waste oil, a thick layer of oil on the ground.
In order to change the status of oil spill, modified felt seal skeleton seal, as follows:
The bearing box and cover for processing, the car out of a deep hole diameter of 65mm, 12mm, fit a specification for the seal 45mm * 60MM * 12mm.
The blanket is removed, the seal with a hammer gently into it, and the correct installation.
After reformation, the equipment in normal operation, the vibration displacement is about 0.04mm, the bearing temperature is about 50 degrees C, each pump in oil consumption is only about 50kg. Keep the house clean, prevent due to lack of oil caused by bearing, shaft damage accident, make the operation of the equipment in good condition.
A single skeleton oil seal is changed to double skeleton oil seal
In order to reduce the amount of leakage is more, according to the structure of the bearing box cover, and put forward the reform scheme, the bearing box end cover for processing hole diameter 65mm. Change the single layer skeleton oil seal to the double-layer skeleton oil seal:
Test run shows that this method is very effective in preventing the leakage of oil in the short term. But after 6 months of continuous operation, due to the wear of the skeleton oil seal will increase the amount of leakage.
Two, skeleton oil seal defects
The felt seal to seal, the use of 4A, although the effect is good, but there are obvious defects.
In practical work, because the seal life is short, often need to change, in the replacement of skeleton oil seal, all equipment needs to be disintegrated, on the one hand to increase the labor intensity of workers, on the other hand, equipment overhaul process, the damage may cause the impeller, bearings and other parts of the economy, does not meet the requirements of equipment management, but if you do not change the oil seal, causing leakage, is not conducive to sealing, but also directly affect the bearing life. In short, the practice has proved that: the skeleton oil seal does not completely solve the problem of oil leakage of the bearing box.
Three, lubricating grease instead of lubricating oil
At present, but also cheap and no leakage of the sealing device has not, and some sealing effect is good, but the price is expensive, the economy is not feasible. After investigation and research, the decision to bold test - to replace the lubricating oil with grease lubrication.
[transformation method]
Taking into account the pump shaft power is only 18.5kw, the flow rate is only 200m3/h; pump speed is 1450r/min, the line speed is 3.4m/s. From the above two points, it is feasible to use grease lubrication.
The concrete method is as follows
The oil in the oil discharged, cleaning of the bearing box.
The end cover of the two ends of the bearing box and the oil discharging hole are opened to eliminate the air in the box body.
The butter gun grease filling hole to the bearing box by filling, add grease from both ends of cover and the oil drain hole extrusion, as fill, and tighten the bearing end cover and the oil drain hole plug wire. Hand turning, the grease evenly distributed in the box body.
Start the pump, open the outlet valve of the pump operation, under normal circumstances, to monitor the temperature of the bearing and the situation of oil pumps.
Grease oil is good, without changing the pump in normal operation, the temperature monitoring data and vibration monitoring data can be seen, with grease instead of lubricating oil is feasible, and can be popularized and applied in the same type of pump.
[lubricating grease lubrication effect]
Grease is not easy to leak, is conducive to the lubrication of pump bearings, to ensure safe and stable operation of the pump, greatly reducing the amount of fuel and the number of times. Not only saving, but also reduce the labor intensity of workers. Specifically speaking:
The cost of oil saving. The use of lubricating oil per pump consumption of 9kg/a, the cost of 63 yuan /a. And the oil consumption in the framework of the skeleton oil seal in good condition for 4kg/ months, the cost of 200 yuan /a. Each pump can save 137 yuan /a, greatly reducing the cost of lubrication.
Reduce maintenance costs. Seal the average life span of 4 months, in order to replace the seal, the annual need for inspection and repair 3 times, instead of lithium grease lubrication, reduce labor costs. Material cost, mechanical cost, and avoid the damage caused by equipment parts in the process of maintenance.
The operation period of equipment is prolonged. From vibration. Temperature and other aspects of the monitoring, the use of grease sealing performance is good, bearings running well, extend the service life of the bearing.
Improve the job environment.
2016年11月6日星期日
Attention to the use of mobile submersible sewage pump
Attention to the use of mobile submersible sewage pump:
1, can not be a long period of low lift pump condition (general use head shall not be less than the rated head of 60%), the best use can control the lift range in the proposed within, to prevent electric pumps due to overload and burn the motor.
2, pump before use should be carefully check whether the cable is damaged, the fastener is loose or fall off, pump in the transportation, storage and installation process has no deformation or damage.
3, using 500V megger electric pump motor and relative insulation resistance, and its value should not be less than 2 ohm, or deal with the stator winding of drying, drying temperature is not allowed to exceed 120 DEG C.
4, the installation of the series of pumps are fixed and mobile two. When using a fixed type automatic installation, the chain were put into (from the pump outlet, the connection should be parallel to the pump outlet) two screw rings or lifting plate on the lifting pump. Slowly slide down the slide until it is automatically coupled in place. When using the mobile installation, first put the hose, with chain wear into two rings under the lifting pump, attention can not be used as cut cable rope, in order to avoid danger.
The direction of rotation 5, after the pump is switched from the inlet to see the rotation is counterclockwise, if the pump reverse, only two lines in any cable connection position can be reversed.
A wire 6, electric pump must be in strict accordance with the relevant regulations in order to ensure that when used properly connected, personal safety in electric pump operation, is strictly prohibited in the near installation, others do? ~ or move, just in case the pump leakage accident.
7, the electric pump in no special circumstances must be equipped with automatic water pump control cabinet, do not hang directly or use the grid switch to connect the power supply, to ensure the normal operation of electric pump.
8, no self circulation cooling device of the pump is strictly prohibited without the overall long-term operation of the water, to prevent overheating of the pump.
1, can not be a long period of low lift pump condition (general use head shall not be less than the rated head of 60%), the best use can control the lift range in the proposed within, to prevent electric pumps due to overload and burn the motor.
2, pump before use should be carefully check whether the cable is damaged, the fastener is loose or fall off, pump in the transportation, storage and installation process has no deformation or damage.
3, using 500V megger electric pump motor and relative insulation resistance, and its value should not be less than 2 ohm, or deal with the stator winding of drying, drying temperature is not allowed to exceed 120 DEG C.
4, the installation of the series of pumps are fixed and mobile two. When using a fixed type automatic installation, the chain were put into (from the pump outlet, the connection should be parallel to the pump outlet) two screw rings or lifting plate on the lifting pump. Slowly slide down the slide until it is automatically coupled in place. When using the mobile installation, first put the hose, with chain wear into two rings under the lifting pump, attention can not be used as cut cable rope, in order to avoid danger.
The direction of rotation 5, after the pump is switched from the inlet to see the rotation is counterclockwise, if the pump reverse, only two lines in any cable connection position can be reversed.
A wire 6, electric pump must be in strict accordance with the relevant regulations in order to ensure that when used properly connected, personal safety in electric pump operation, is strictly prohibited in the near installation, others do? ~ or move, just in case the pump leakage accident.
7, the electric pump in no special circumstances must be equipped with automatic water pump control cabinet, do not hang directly or use the grid switch to connect the power supply, to ensure the normal operation of electric pump.
8, no self circulation cooling device of the pump is strictly prohibited without the overall long-term operation of the water, to prevent overheating of the pump.
Advantages and characteristics of submersible sewage pump
Main features of submersible sewage pump
1 unique leaf or double blade impeller structure, greatly improve the through capacity of sewage, which can effectively through 5 times of pump diameter and pump diameter solid particles 50%.
2 mechanical seal using a new hard corrosion-resistant tungsten carbide material, while the seal is improved to double end seal, so that it is in the oil chamber for a long time to run, can make the pump safe and continuous operation for more than 8000 hours.
3 compact structure, small volume, low noise, energy saving effect, convenient maintenance, no need of pump room, dive into the water to work, greatly reduce the project cost.
4 the pump seal oil chamber is provided with a high precision anti interference water leakage detection sensor, and a heat sensitive element is embedded in the stator winding, and the absolute protection of the motor of the pump is provided.
5 according to the user needs to be equipped with a fully automatic safety protection control cabinet, the pump leakage, leakage, overload and over temperature and so on absolute protection, improve the safety and reliability of the product.
6 the float switch can automatically control the start and stop of the pump according to the change of the required liquid.
7 according to the user needs to be equipped with dual guide rail automatic coupling installation system, which brings great convenience to the installation and maintenance, people do not have to enter the sewage pit.
Advantages of submersible sewage pump
1 compact structure, small floor area. Sewage pump into the liquid as a result, it can be directly installed in the sewage pool, without the construction of a dedicated pump pumps and machines used to install, can save a lot of land and infrastructure costs.
2 convenient installation and maintenance. Small, free installation of sewage pump, sewage pump large are generally equipped with automatic coupling device can be automatically installed, the installation and maintenance very convenient.
3 continuous running time. Due to pump and motor coaxial, short axis, rotating parts of light weight, so the load bearing on the bearing (radial) is relatively small, life expectancy is much longer than the general pump.
4 there is no cavitation damage and irrigation water and other issues. Especially after a little to the operator has brought a lot of convenience.
1 unique leaf or double blade impeller structure, greatly improve the through capacity of sewage, which can effectively through 5 times of pump diameter and pump diameter solid particles 50%.
2 mechanical seal using a new hard corrosion-resistant tungsten carbide material, while the seal is improved to double end seal, so that it is in the oil chamber for a long time to run, can make the pump safe and continuous operation for more than 8000 hours.
3 compact structure, small volume, low noise, energy saving effect, convenient maintenance, no need of pump room, dive into the water to work, greatly reduce the project cost.
4 the pump seal oil chamber is provided with a high precision anti interference water leakage detection sensor, and a heat sensitive element is embedded in the stator winding, and the absolute protection of the motor of the pump is provided.
5 according to the user needs to be equipped with a fully automatic safety protection control cabinet, the pump leakage, leakage, overload and over temperature and so on absolute protection, improve the safety and reliability of the product.
6 the float switch can automatically control the start and stop of the pump according to the change of the required liquid.
7 according to the user needs to be equipped with dual guide rail automatic coupling installation system, which brings great convenience to the installation and maintenance, people do not have to enter the sewage pit.
Advantages of submersible sewage pump
1 compact structure, small floor area. Sewage pump into the liquid as a result, it can be directly installed in the sewage pool, without the construction of a dedicated pump pumps and machines used to install, can save a lot of land and infrastructure costs.
2 convenient installation and maintenance. Small, free installation of sewage pump, sewage pump large are generally equipped with automatic coupling device can be automatically installed, the installation and maintenance very convenient.
3 continuous running time. Due to pump and motor coaxial, short axis, rotating parts of light weight, so the load bearing on the bearing (radial) is relatively small, life expectancy is much longer than the general pump.
4 there is no cavitation damage and irrigation water and other issues. Especially after a little to the operator has brought a lot of convenience.
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