Interpretation of the Characteristics and Working Principle of Metering Pumps

[Asia Pump Network News] is a metering pump to meet a variety of strict process needs, the flow rate can be adjusted within the range of 0-100% stepless, used to transport liquid (especially corrosive liquids) A special volume pump . Metering pump, also known as quantitative pump or proportional pump. The metering pump is a reciprocating displacement pump, used for precise measurement, usually requires the accuracy of the metering pump does not exceed ± 1% accuracy. With the modernization of the industry toward automation, long-distance automatic control of the continuous development of this situation, metering pumps supporting the strong, to adapt to a wide range of media (liquid) advantages are particularly prominent. A comprehensive understanding of the types and characteristics of metering pumps The type and characteristics of metering pumps According to the structure of metering pump hydraulic end, the metering pump is often divided into plunger, hydraulic diaphragm, mechanical diaphragm and bellows four. ① Plunger metering pump and reciprocating pump structure is basically the same, the hydraulic end by the cylinder, plunger, suction and discharge valves, packing and other components, in addition to meet the hydraulic pump reciprocating pump design requirements, but also Suction valve, discharge valve, seal and other components that affect the metering accuracy of the pump should be carefully designed and selected. ② hydraulic diaphragm metering pumps commonly known as diaphragm metering pumps. A single diaphragm metering pump is equipped with a diaphragm at the front of the plunger (the plunger is not in contact with the diaphragm) and separates the hydraulic end into a transfusion chamber and a hydraulic chamber. The infusion chamber is connected to the pump for suction and discharge. The hydraulic chamber is filled with hydraulic oil (light oil) and communicates with the hydraulic tank (fill tank) at the upper end of the pump. When the plunger moves back and forth, the pressure is transmitted to the diaphragm by the hydraulic oil and deflects the volume before and after the deflection, which serves as a fluid delivery function and meets the requirements of accurate metering. ③ mechanical diaphragm metering pump diaphragm and plunger mechanism connected, no hydraulic oil system, the plunger moves back and forth directly before and after the diaphragm deflection deformation. ④ bellows metering pump structure and mechanical diaphragm metering pump is similar, just to replace the diaphragm bellows, the end of the plunger and bellow fixed together. When the plunger reciprocating, the bellows is stretched and compressed, thus changing the volume of the cylinder to achieve the purpose of infusion and measurement. Metering pump flow adjustment Metering pump flow adjustment methods commonly used to adjust the plunger (or piston) stroke, adjust the plunger reciprocating frequency or both of the above three methods, of which the most widely used way to adjust the stroke. The method is simple and reliable, and can still maintain high metering accuracy at low flow rates. Trip adjustment methods are the following three. ① Parking manual adjustment. Manually adjust the metering pump stroke while parking. ② manual adjustment during operation. In the pump operation to change the axial displacement, in order to indirectly change the crank radius, to achieve the purpose of adjusting the stroke length. Common methods are N-shaped crankshaft adjustment, L-shaped crankshaft adjustment and eccentric cam adjustment. ③ automatic adjustment during operation. There are two common pneumatic control and electric control. Pneumatic control is by changing the pressure signal to achieve the purpose of automatic adjustment of travel. Electric control is achieved by changing the electrical signal to automatically adjust the trip.

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