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).