According to gear pump selection principles and selection of basic conditions, the specific operation is as follows:
1. According to the layout of equipment, topography, water level conditions and operating conditions, the choice of horizontal, vertical and other types (pipeline type, submersible type, submerged type, non-clogging type, self-priming type, gear type, etc.) Pump.
2, according to the nature of the liquid medium to determine the water pump, hot water pump or pump, chemical pump or corrosion-resistant pump or impurity pump, or non-clogging pump. Pumps installed in the explosive area should be based on the explosion area level, using the appropriate explosion-proof motor.
3, according to the size of the flow, to determine the menu suction pump or double suction pump; according to the level of the head, single-stage pump or multi-stage pump, high speed pump or low speed pump (air conditioning pump) Single-stage pump and multi-stage pump can also be used when the first choice of single-stage pump.
4, to determine the specific model of the pump to determine the choice of what series of pumps, you can press the maximum flow, (in the absence of maximum flow, it is usually desirable to 1.1 times the normal flow as the maximum flow), take to enlarge 5% -10% margin After the lift of the two main parameters of performance, in the spectrum or series of characteristic curve to determine the specific model. Operation is as follows:
　　
Use the pump characteristic curve to find the desired flow value on the abscissa and the desired lift value on the ordinate. Draw the vertical or horizontal lines from the two values, respectively, and the intersection of the two lines falls exactly on the characteristic curve. The pump is to three years ago many of China's slurry pump also uses horizontal centrifugal pump shown in Figure 1. The overcurrent member of the horizontal centrifugal pump is made of cast iron, and the sealing form is the packing seal. Many problems in production and operation:
1, horizontal centrifugal pump flow pieces (that is, wearing parts) has a very short service life. As the pressure filter post-press larger. At this point the pump pressure is too large, the flow of the pump to withstand the friction load, to speed up the wearing parts wear and tear, the general set of pump parts life of 35-45 hours.
2, serious leakage. The use of packing seal, coupled with the pump delivery of corrosive media, with the supply pressure increases, the sealing performance worse. Leakage caused by metal loss at the same time, although there is a recovery pump underground, but located in the corner of the operation is not convenient, as long as the worker's sense of responsibility is not strong, leaking ore (gold, copper is high) will lose the whole process affect the metal balance and the scene The civilized production.
3, frequent maintenance, maintenance and operation difficulties. The pump chamber is full of pulp, the seal is not good, the slurry is easy to enter the pump bearings, often to be dismantled pump body, downtime seriously affect the production.
The traditional gear pump starch sewage treatment is usually the sewage directly into the filter press with a centrifugal pump, filtered starch solid waste air-dried packaged and shipped away. Such a process in the actual use of the process will generally encounter two problems.
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