Matching relationship between model and use efficiency of submersible electric pump

Shanghai WeiHu(WEL) Pump Industry Co., ltd., is a professional production of the development, production, sales, manufacturing all kinds of submersible pumps, submersible motor, stainless steel pump, hot water pump and auxiliary equipment of the scale of modern professional production of high-tech enterprises. The company has a complete production, testing technology and equipment, the main production of 150QJ, 200QJ, 250QJ, 300QJ and other series of submersible pumps and ancillary equipment.

Submersible pumps of different sizes have different scope of use, any of the provisions of submersible pump nameplate on the flow and head is the submersible electric pump rated the best point is this submersible pump efficiency is high.

Along with the different structure form of the submersible pump, the characteristics of the submersible pump are different. The centrifugal pump or mixed flow pump, when the use of the head exceeds the rated head, shaft power of pump to reduce, when using the head below the rated head, shaft power of pump required increases, when the use of the head a lot lower than the rated head, shaft power of pump required will be greatly increased. At this time, the load of the electric submersible pump is increased, the stator current is increased, and the stator winding tends to overheat.

If there exists a submersible pump long time low lift and large flow operation, the stator winding heating is very powerful, often burn out the motor. The axial flow pump, the characteristics of the opposite; when using the head below the rated head, shaft power of pump to reduce, when the use of the head exceeds the rated head, shaft power of pump required increases, when the use of the head increased more than the rated pump head, shaft power will be greatly increase. At this time, the stator winding of submersible electric pump will overheat. If you are running in high lift axial flow submersible pump long time heating, the stator winding is very powerful, often burn out the motor.

Submersible pump generally in the normal operation of 0.7 - 1.2 times the rated flow range (submersible sewage pump can operate normally in the 0.7 - 1.3 times the rated flow rate range), beyond this range, could cause an overload, thus requiring the user to select and use submersible pump, we must consider the appropriate scope of use. Especially for multi-stage submersible electric pump, more need to pay attention to: high lift submersible pump, do not use too low head, so as not to waste electrical energy, and may damage the submersible electric pump.

The raw material prices continued to rise for integrated development

Countries, China's pump industry is still relatively backward. But the person pointed out that the domestic economic development is very rapid, but the supply of water and electricity in many factors under the influence of a serious shortage of water pumps and generators market space is still great. China's pump industry could use the advantage to achieve integrated development.
Although, suffered the impact of raw materials, but the pump industry has maintained a relatively stable demand and development, annual growth rate remained at around 13%. The reason is mainly the increasing improvement of urban infrastructure to a large extent contributed to the water pump industry to enter the sales peak. And together with the national implementation of stimulating domestic demand increasing, many places for agricultural water pumps also subsidies, all of these water and construction of electrical engineering project promoted the development of the pump industry, the pump industry has been a development opportunity.
Although the domestic pump industry has made considerable progress, but there are still a lot of problems. Market order; product structure is not complete, the low-end market products oversupply; relatively low levels of enterprise technology, independent research and development of independent innovation ability of these problems largely hindered the healthy development of the pump industry.
Water pump industry market competition has intensified so many vendors realize that technical level, quality, price and service will become one of the important factors of competition in a certain period of time. As pump vendors to the quality of service, good quality to win the market.
20 years of reform and opening up, China's pump industry in terms of size, strength, science and technology, talent and other aspects of a very large development, to provide economic and technological basis for the development of technology. China's pump industry has the ability to achieve integrated development, but also the only way in order to continue to narrow the gap in developed countries to catch up or exceed the foreign advanced level.

What is the jywq?

We will meet the sewage inside the bottom of the precipitation of impurities in the choice of sewage pump, then meet this situation we should choose jywq. Jywq comes together when disc, disc speed can stir the precipitation at the bottom of the sewage together with impurities play together.
First to know about jywq:
Jywq main features
1 when the sewage pump operation, automatic mixing tank bottom sediments, completely prevent dirt accumulation, no need to manually clean up;
2 unique impeller design, with the fibers, debris chopped and tear function;
3 by using external circulation cooling system, so that the sewage pump low water level operation, reduce the motor start frequency, extend the motor life;
4 municipal engineering, construction site.
5 exploration, mining, power plant auxiliary machine
6 biogas digesters in rural areas, irrigation ponds, clear edit this paragraph jywq
What is the jywq?
Jywq main purpose
1 factories and commercial heavily polluted wastewater discharge.
2 urban sewage treatment plants, hospitals, hotels drainage system.
3 residential sewage drainage station.
Water supply device for water supply plant of 4 drainage station and water supply plant of civil air defense system.
5 municipal engineering, construction site.
6 exploration, mining, power plant auxiliary machine.
7 biogas digesters in rural areas, farmland irrigation, dredginghetang.
The above is jywq characteristics and applicable scope, according to the above basic introduction to understand the basic situation of the water pump, customers can choose according to the actual parameters.

Definition and classification of mixed flow pump

Under the action of centrifugal force and axial force, the mixed flow pump is a kind of centrifugal pump, which belongs to a kind of centrifugal pump and axial flow pump. Mixed flow pump is a kind of "pull" type structure of the pump, in the inspection and removal of impeller and shaft seal, without the pipeline connected with the pump body apart. The pump shaft is equipped with precision machining, with thin oil lubrication bearing, shaft sleeve is arranged in the stuffing box cover. Oil bearing box, a constant level oiler to control. When the mixed flow pump impeller in the water rotation, the blades of the centrifugal force, but also has the lifting effect, the impeller rotation by the mixing of the two kinds of action, so called mixed flow pump.
Working principle of mixed flow pump:
When the prime mover drives the impeller to rotate, the action of the liquid is both centrifugal force and axial thrust, which is integrated with the centrifugal pump and axial flow pump, and the liquid is inclined to flow out of the impeller. So it is a kind of pump between the centrifugal pump and axial flow pump. Mixed flow pump than the speed higher than the centrifugal pump, lower than the axial flow pump, generally between 300-500. Its head is higher than the axial flow pump, but the flow rate is smaller than the axial flow pump, larger than the centrifugal pump.
Classification of mixed flow pumps:
1, according to the inspection and disassembly form can be divided into: can draw out type mixed flow pump and can not draw out type mixed flow pump;
2, press the water chamber type can be divided into: vane type mixed flow pump and the vortex shell type mixed flow pump;
3, according to the blade adjustment type can be divided into: fixed mixed flow pump, semi adjustable mixed flow pump and fully adjustable mixed flow pump.

Analysis of pump type selection

Convenient pipe installation, can be widely used for general pipeline pump for high-rise building pressurized water use, and can transport particles containing fiber wastewater, except for conveying the sewage, but also suitable for drainage pump, filter cleaning condensate pump etc.. Enterprise unit wastewater discharge. Urban sewage treatment plant discharge system. Subway, underground room, air defense system drainage station. The hospitals, hotels, high-rise building sewage discharge. The residentialsewagepumping station. The municipal engineering construction site in the mud, dilute emissions. Water supply device, tap water factory. The farms and rural sewage irrigation. To exploration and mining equipment for water treatment. The place of the shoulder arm, pumping mud. The use condition of water temperature is less than or equal to 60 DEG C, the liquid pH value of 4 ~ 10.
The 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%.
Mechanical seal using a new type of 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.
The 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.
The sealing oil pump is arranged inside the Water Leakage high-precision interference detection sensors, and embedded within the stator windings of the thermal components, the absolute protection of the pump motor.
And according to user needs can be equipped with automatic safety protection control cabinet for the pump Water Leakage, leakage, overload and over temperature of absolute protection, improve the safety and reliability of the product.
The float switch solution based on the required changes, automatic control of pump start and stop, without special care, it is very convenient to use.
And according to user needs with double rail automatic coupling installation system, which brings great convenience to installation and maintenance, this may not enter the sewage pit.
It can be used in the whole range of lift, while the motor is not overloaded.
We have two different installation methods, fixed automatic coupling installation system, mobile free installation system.
Pipeline sewage pump installation technology is the key to determine the installation height of the pipeline sewage pump is the suction process. The height is the vertical distance from the water surface to the center line of the centrifugal pump impeller, it allows suction confused on a high vacuum, high vacuum suction on the vacuum pump inlet section refers to the value of the pump product specifications or nameplate allowed, and in 1 the standard atmospheric pressure, water temperature of 20 DEG C case the determination to test. It does not take into account the current situation of water after the water pipe. The pump installation height should be allowed to suck up the vacuum after deducting the suction pipe loss head, the remaining part of the value, it is to overcome the actual height of water absorption.
Pump installation height can not exceed the calculated value, otherwise, the centrifugal pump will not be pumped to the Sheung shui. In addition, the calculated values affect the size of the resistance water pipe head loss, therefore, should adopt the shortest piping layout, and minimize the elbow and other parts, can also be appropriately equipped with larger diameter pipe to reduce the flow tube.
It should be noted that the elevation of the installation site and water temperature of the sewage pump installation site is different from the test conditions, such as local elevation more than 300 meters or more than 20 of the water temperature is pumped, the calculated value to be modified. Atmospheric pressure at different altitudes and the saturation vapor pressure at temperatures above 20 c.. However, when the water temperature is below 20 degrees Celsius, the saturated vapor pressure is negligible.
From Li Shen pipeline sewage pump installation technology, suction pipes require stringent tightness, can not leak, Water Leakage, otherwise it will damage at the pump inlet vacuum, pump out the water, even when serious pumping Sheung shui. Therefore, to do a good job in the pipeline interface, to ensure the quality of the construction of the pipeline connection.

What are the types of commonly used flange gaskets?

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.
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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.