Method of multi-stage pump flow control and adjustment
There are three methods for multi-stage pump flow control and adjustment: adjusting plunger or piston stroke, adjusting stroke and pump speed. Among them, adjusting stroke is the most widely used. The method is simple and reliable. There are three ways to adjust the stroke:
1. Manual adjustment when parking: Manually adjust the stroke of the multi-stage pump when parking.
2. Manual adjustment during operation: change the axial displacement during pump operation to concisely change the crank radius to achieve the purpose of adjusting the stroke length. Common methods include N-shaped crankshaft adjustment, L-shaped crankshaft adjustment and eccentric cam adjustment.
3. Automatic adjustment during operation: there are two common types: pneumatic control and electric control. Pneumatic control is to automatically adjust the stroke by changing the air source pressure signal; electric control is to automatically adjust the stroke by changing the electric signal.
When the metering medium and working pressure of the multi-stage pump are determined, the output flow of the metering pump can be adjusted in two dimensions by adjusting the stroke length and reciprocating frequency. Both the imported stroke length and the reciprocating frequency can be used as adjustment variables, but in engineering applications, the stroke length is generally regarded as a coarse adjustment variable, and the reciprocating frequency is a fine adjustment variable: adjust the stroke length to a certain value, and then achieve fine adjustment by changing its frequency Increase the flexibility of metering pump adjustment. In relatively simple applications, the stroke length can also be manually set, and only the stroke frequency is used as the adjustment variable, thus simplifying the system configuration.
