Research on Flow Characteristics of Drainage Diaphragm Pump

Recently, frequent accidents with oil spills on the sea have brought more and more attention to the prevention and recovery of spilled oil. In view of the oil spill recovery operation at sea and the characteristics of the oil, the oil-contaminated delivery pump should have the advantages of compact structure, light weight, large handling capacity, capable of conveying fluids with solid particles or viscous properties, and having no-load operation and continuous operation, Overload will not burn features.

Diaphragm pump works for oil spill recovery, but domestic bulky pump structure bulky, low throughput, foreign technology blockade serious. Therefore, developing a new type of diaphragm pump that is suitable for China's national conditions, low price and relatively large capacity has become an urgent problem to be solved. Diaphragm pump application drainage principle of volume efficiency has greatly improved, more suitable for offshore sewage transport.

According to the basic principle of fluid mechanics, the paper established a theoretical model of the drainage diaphragm pump, and solved the differential equations, and got the law of fluid flow in the theory drainage pump. The analysis shows that the working process of the drainage pump is divided into two stages of propulsion flow and drainage flow. During the propulsion flow stage, the fluid discharged by the piston is faster than the fluid velocity in the discharge pipe, and some of the fluid is stored in the buffer tank. As the piston speed decreases, The fluid in the buffer tank is released again and the fluid is accelerated. In the flow-diversion phase, the external fluid is continuously transported by the inertial force of the fluid in the discharge pipe. The speed source is used to simulate the function of buffer tank. The valve switching function is realized based on In-Form method and animal body method. MOF file of object movement is prepared. Finally a set of numerical calculation method of drainage diaphragm pump is formed. This method is used to simulate a theoretical drainage pump, which verifies the existence of drainage flow and shows that the volumetric efficiency of the drainage pump reaches more than 200% under the theoretical conditions.

At the same time, the calculated flow curves are roughly the same as the theoretical ones, which proves the rationality of numerical methods. The same numerical method was used to simulate the internal flow of a practical drainage diaphragm pump. It was found that the volumetric efficiency of the pump was 127% under the action of drainage, but the internal flow was obviously asymmetric. The main flow was on the discharge pipe side and the pump Within the flow loss. The numerical simulation of the internal flow in a symmetrical drainage diaphragm pump shows that the internal flow loss is obviously reduced and the drainage effect is enhanced. The results of the thesis have certain theoretical guidance value for the optimal design of the drainage diaphragm pump.

The diaphragm pump, also known as the control pump, is the main type of actuator that uses a power operation to change fluid flow by accepting the control signal from the modulating unit. Diaphragm pump generally by the implementing agencies and valves. The use of compressed air as the power source, for a variety of corrosive liquids, with particles of liquid, high viscosity, volatile, flammable, highly toxic liquid can be smoked exhausted. Diaphragm Pump Category: QBY type pneumatic diaphragm pump, DBY-type electric diaphragm pump, DP miniature high-pressure electric diaphragm pump.

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