The principle of throttling adjustment is to change the shape of the pipeline characteristic curve, thereby changing the operating point of the centrifugal pump. Making the outer diameter of the centrifugal pump impeller small can change the performance of the pump at the same rotation speed, which can change both the flow rate and the head.. This kind of adjustment method also has no additional energy loss and is a more economical method, but it is only suitable for centrifugal pumps to be used when the centrifugal pump changes to small flow operation for a long time.2016-04-20 There are 4 types of .
(4) The outer diameter of the cutting impeller is adjusted. But a variable speed motor must be used. (1) Throttle adjustment. (3) Variable speed adjustment. Because the gate valve is closed small and more energy is consumed on the gate valve, this adjustment method has a large loss Solar Photovoltaic Pump Controller and poor economy, but because this method is simple and convenient, it is widely used in operation. (2) Bypass return adjustment. When the pump is working to reduce the flow rate, close the gate valve at the outlet of the pump, and the resistance of the gate valve will increase.
This is because the head of the vortex pump rises sharply when the flow is reduced, and the shaft power increases, but when the flow is increased, the shaft power drops slightly. The principle is to change the position of the characteristic curve of the pump by changing the speed of the centrifugal pump, thereby changing the operating point.
This adjustment method has no additional energy loss and is a relatively economical method. This method is more suitable for vortex pumps. This adjustment method is to open the bypass valve of the pump, and a part of the liquid returns from the pump discharge pipe to the suction pipe, thereby reducing the discharge pipe flow
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