The inner surface of the centrifugal pump and the inner surface of the pressurized water chamber are rusty. Surface rust will reduce the pump water 7% -8%; maintenance only with steel brush and iron sandpaper or grinding wheel smooth, you can make it in the work of the fuel consumption or power consumption reduced by 9% -14%. Seal ring gap increases. According to the test, when the impeller radius in the direction of the gap increased by 4 mm, the pump will be reduced by 10%; maintenance only with organic adhesive plus asbestos line to restore the factory to the provisions of the gap, you can make the pump at work fuel consumption or Power consumption reduced by 10% -12%. The axis of the water chamber and the impeller does not coincide. According to the test, when the pressure chamber and the impeller axis deviation of 2 mm or skew angle greater than 2 degrees, the pump water will be reduced by 5% -6%; maintenance, just careful measurement, carefully identify the axis coincidence position, You can make the pump at work when the oil or power consumption reduced by 6% -7%. Blade installation angle is inconsistent. When the blade installation angle is inconsistent, the pump water will be reduced by 5%; maintenance, the use of angle scale, the installation of fixed position, you can make the pump at work fuel consumption or power consumption reduced by 5% -6%.

Since the direction of the suction pipe and the outlet pipe is affected by the rotation direction of the stainless steel multi-stage centrifugal pump, it is important to understand the definition of the rotation direction. The stainless steel multistage centrifugal pump centrifugal lift is constant for a given impeller diameter and flow, and the lift head is a function of flow. At some point on the head flow curve, once the lift head exceeds the centrifugal head, then at these points Pressure gradient reverse, resulting in the opposite direction of flow, that is, the phenomenon of reflow.

The mechanism of the inlet return of the impeller with low specific speed centrifugal pump is analyzed from the theoretical and experimental aspects. It is considered that the rotational speed component is the main reason for the inlet return of the impeller, and it is pointed out that the return flow is the main reason leading to the instability of the small flow. As the design staff in the design of low-speed high-speed induction wheel stainless steel multi-stage centrifugal pump is often used positive angle method, in order to ensure that the induction wheel produced stainless steel multi-stage centrifugal pump head to meet the energy requirements of centrifugal wheel imports, The inlet angle is greater than the liquid flow angle, and the centrifugal wheel is given better cavitation performance, and the blade inlet angle is larger than the liquid flow angle. In order to obtain high efficiency, in the design of ultra low specific speed high speed induction wheel centrifugal pump When the actual flow angle is smaller than the flow angle under the design conditions, so that the induction wheel and the centrifugal wheel inlet front has a non-uniform peripheral velocity component, Thereby producing a vortex around the flow line.

Ordinary pump work on the ground, while the submersible pump works in the water. It is because the submersible pump work environment, so the requirements of submersible pump is much higher than the ordinary pump. The most important point, submersible pump corrosive problems, used to deal with submersible pumps in a timely manner, you can use the third device to dry the submersible pump. There is a little different, submersible pump before running to fill the water, because only the submersible pump will produce centripetal force, centripetal force will promote the water.

A. Overload overcurrent debugging: the thermal relay current adjustment knob, slowly to less than the actual working current direction of rotation, each rotation a little scale, interval 2-5 minutes or so, until the thermal relay action unit to stop working so far. And then reverse the rotation can be a little scale;
B. Phase loss sensitivity debugging: the unit to start again, and one by one off the unit knife switch fuse, so that the unit in two-phase electrical work. Observe whether the thermal relay can cut off the control power within 5 seconds;
C. Short-circuit test: This step is usually protected by the air switch of the power supply system. Generally do not field test (more dangerous) requires the power supply system must be equipped with air switch (air switch model preferred DW10 type, selected DZ type).

Simple submersible pump also has a lot of species and shape, it is also a fashionable object. Submersible pump start device mainly Y-type star delta starter start device, direct start device, auto-step-down start device, variable frequency step-down device these four. So what about their function? Then look at your introduction below.
1.Y-type star delta buck starting device
This is a large power submersible pump, can be run in the overload, stall and undervoltage and other abnormal operating conditions to protect, can also be based on changes in pressure or level of automatic control of submersible pump operation, and Equipped with stator winding overheating, bearing overheating, motor or oil indoor water and other special protection.
2.Direct start device
It is used for low-power submersible motor and submersible pump, starting device by the contactor, relays and other components, can be equipped with stator winding overheating protection.
3.Auto-step-down start device
This device can be on the submersible motor and submersible pump step-down start, starting device in addition to contactors, relays and other components, the control panel and equipped with a self-lotus transformer. Its function to the first two devices are equipped with the function.
4.Variable frequency step-down start device
Its function is that the water supply system can automatically adjust the system water supply pressure, so that the water supply pressure to maintain a constant, to avoid the water pressure fluctuations. Using the inverter device soft start, eliminating the start of the impact of the current, extending the service life of the device. The water supply system will automatically adjust the speed of the submersible pump and the number of running units according to the set pressure, so that the water supply system can be operated in the energy efficient optimization state.

In submersible pump design, clear hole technology is a very important work. How to master its clear hole technology, the following for everyone to elaborate:
Submersible pump clear hole technology mainly draws on the gas lift type reverse rotation rotary drilling mud removal system. Due to the use of impact drilling machine into the hole, so the water pile mud requirements are not very high, are piling the process of self-made mud, but also because after the hole has been used to dig the large diameter particles have been excluded, so you can do the mud sucking jobs. The depth of the hose in the catheter connected to the conduit should be greater than 1.5 times the height of the head in the borehole to the mouth, and the duct is about 20-30 cm from the bottom of the hole.
Through the submersible pump on the vacuum suction of the mud, reducing the water level within the catheter, because the catheter and the water level within the pile to form a connector, so that the water quickly from the bottom of the catheter flock to the catheter, so that through the catheter hole on the pile bottom layer Upward pressure, the bottom of the pile into the catheter into the catheter and then into the rubber tube, and finally discharged by the submersible pump.