2017年1月6日星期五
2017年1月5日星期四
The use of small stainless steel submersible pumps
The small size stainless steel submersible pump is compact, small in volume, small in noise and energy-saving. It is convenient for maintenance. It is easy to use and easy to use. It is not suitable for frequent moving or temporary emergency use. It is not fixed installation, as long as the rubber tube or connected to the tube, the submersible pump can be placed underwater flat, but must be equipped with safety control box to ensure safety. Submersible pump with stainless steel stamping process design, greatly improve the pump and impeller surface smoothness, so that water friction loss reduced to the extreme, so energy-saving effect is very significant. At the same time, so the size and weight of the pump dropped significantly, which is ideal for mobile use needs of the occasion.
Small stainless steel submersible pump use:
① family bath pressurization and water supply.
② gardens, scenic water circulation transport.
③ food hygiene fluid transport.
④ factory transport or corrosive liquids to enhance and transport.
⑤ family drinking water extraction.
⑥ laboratory health water.
Villa flowers and trees and other watering.
2017年1月4日星期三
2017年1月3日星期二
2017年1月2日星期一
Analysis on Application of Sewage Pump (2)
First, deputy impeller hydrodynamic seal technology application
The so-called sub-impeller hydrodynamic seal is in the pump impeller back cover near the back of the coaxial installation of an open impeller. When the pump work, vice impeller with the pump spindle rotation, vice impeller in the liquid will rotate together, turning the liquid will produce an outward centrifugal force, the centrifugal force on the one hand to withstand the flow of mechanical seal liquid, reducing the mechanical Seal the pressure. On the other hand to prevent the solid particles in the media into the friction of the mechanical seal, reducing the wear of mechanical seal grinding block and prolong its service life.
Vice impeller in addition to play a role in sealing, but also can play a role in reducing the axial force in the submersible pump axial force mainly by the role of the liquid in the impeller pressure on the pressure and the entire rotating part of the composition of gravity, which The two forces act in the same direction, and the resultant force is the sum of the two forces. It can be seen that the performance of the same parameters in the case of submersible sewage pump axial force than the general horizontal pump to large, and the balance of difficulty is more difficult than the vertical pump. Therefore, submersible sewage pump, the bearing is easy to damage the reason is also the axial force has a great relationship.
If the auxiliary impeller is installed, the direction of the differential pressure acting on the auxiliary impeller is opposite to that of the above two forces, which can cancel out part of the axial force, which will prolong the life of the bearing. However, the use of vice impeller sealing system also has a drawback, that is, vice impeller to consume part of the energy, generally about 3%, but as long as the design is reasonable, can this part of the loss is reduced to a minimum.
Second, the pump design technology without overload application
In general centrifugal pumps, the power is always increased with the increase in flow, that is, the power curve is a curve with the increase in flow, which the use of the pump will bring a problem: When the pump in the In general, the pump power is less than the rated power of the motor. This pump is safe to use; however, when the pump head is lowered, the flow rate increases (as can be seen from the pump performance curve) Power also increased.
When the flow rate exceeds the design point of flow and reach a certain value, the pump's input power may exceed the motor rated power and cause the motor overload and burned. When the motor is overloaded, either the protection system operates to stop the pump, or the protection system fails to burn the motor.
Pump head below the design point of use of working conditions, is also often encountered in practice, one case is pump selection, the pump head selected too high, while the actual use of the pump is to reduce the head Use; the other is the pump operating point in use is not very good to determine, in other words the pump flow rate often need to be adjusted; there is a situation where the pump needs to change the location of frequent use. These three conditions may overload the pump and affect pump reliability. It can be said, the pump does not have full-lift characteristics (including sewage pump), its use will be subject to a large extent.
The so-called full-lift characteristics (also known as no overload feature) refers to the power curve increases with the flow rate is very slow increase, it is more desirable when the flow increases to a certain value, the power will not only increase, The power curve is a hump curve, if so, as long as we select the motor rated power slightly more than the hump point of the power value, then the flow of 0 to the maximum flow of the entire range, whether you are in that one Operating point on the run, the pump power will not exceed the motor power leaving the pump overload, with this performance of the pump, whether the selection or use, will be very convenient and reliable. In addition the motor power does not need to be too large, can save considerable equipment costs.
Analysis on Application of Sewage Pump (1)
1. Sewage pump is a pump and motor connected, and at the same time into the liquid work under the pump products, and general horizontal or vertical sewage pump compared to the sewage pump has the following advantages: 1. Structure Compact, small footprint. The sewage pump can be directly installed in the sewage pond because of the submerged operation. It is not necessary to construct a special pumping station to install the pump and the machine, which can save a lot of land and infrastructure.
2. Installation and maintenance convenience. Small sewage pump can be installed free, large-scale sewage pumps are generally equipped with automatic coupling device can be automatically installed, installation and maintenance is very convenient.
3. Continuous operation for a long time. Sewage pump As the pump and motor coaxial, shaft short, light weight of the rotating parts, so bear the load on the bearing (radial) is relatively small, life expectancy much longer than the average pump.
4. There is no cavitation damage and irrigation water and other issues. In particular, the latter point to the operator to bring a great deal of convenience.
5. Vibration and noise, the motor temperature is low, no pollution to the environment.
It is because of the above advantages, sewage pump has been more and more attention, the use of more and more widely from the original simply used to transport water to the present can transport a variety of domestic sewage, industrial wastewater, construction sites Drainage, liquid feed and so on.
In the municipal engineering, industry, hospitals, construction, hotels, water conservancy construction and other industries play a very important role.
But anything is divided into two, the most critical problem for the sewage pump is the reliability of the problem, because the use of sewage pump is liquid in the case; transmission medium is a mixture of solid materials containing some of the liquid; pump and The motor is very close; the pump is a vertical arrangement, the weight of the rotating parts and the impeller to withstand water pressure in the same direction. These problems have made the sewage pump in the seal, the motor bearing capacity, bearing arrangements and selection requirements in general than the sewage pump is higher.
In order to improve the life of sewage pumps, and now most of the domestic and foreign manufacturers are in the pump protection system to find ways to leak in the pump, overload, over-temperature and other failures can automatically alarm, and automatically shut down for repair. However, we believe that in the sewage pump to set the protection system is necessary, it can effectively protect the safe operation of the pump.
But this is not the problem, the protection system is just a pump failure after a remedy, is a more passive approach. The key issue is to proceed from the root, completely solve the pump in the sealed, overload and other issues, this is a more proactive approach. To this end, we put the auxiliary impeller hydrodynamic seal technology and pump no-overload design technology applied to the sewage pump, the greater the pump seal reliability and carrying capacity, extended pump life.
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