When designing and arranging pipelines for gear pump, the following matters shall be paid attention to:
A. Reasonably select the pipe diameter of the gear pump. The pipe diameter is large. Under the same flow rate, the liquid flow speed is small and the resistance loss is small. However, the high price and small pipe diameter will lead to a sharp increase in the resistance loss, which will increase the lift of the selected pump, increase the matching power, and increase the cost and operation cost. Therefore, it should be considered comprehensively from the perspective of technology and economy.
B. The maximum pressure that the discharge pipe and its pipe joint can bear shall be considered.
C. The pipeline shall be arranged as a straight pipe as far as possible to minimize the accessories in the pipeline and the length of the pipeline. When turning is necessary, the bending radius of the elbow shall be 3 ~ 5 times the diameter of the pipeline, and the angle shall be greater than 90 ℃ as far as possible.
D. The discharge side of the pump must be equipped with a valve (ball valve or stop valve, etc.) and a check valve. The valve is used to regulate the operating point of the pump. The check valve can prevent the pump from reversing when the liquid flows back, and prevent the pump from being hit by water hammer. (when the liquid flows back, it will generate huge reverse pressure and damage the pump)
2、 Influence of flow head of gear pump
Determination of flow
A. If the minimum, normal and maximum flow have been given in the production process, the maximum flow shall be considered.
B. If only the normal flow is given in the production process, a certain margin shall be considered.
For ns100 high flow and low head pumps, the flow margin is 5%, for ns50 low flow and high head pumps, the flow margin is 10%, for 50 ≤ ns ≤ 100 pumps, the flow margin is also 5%, for pumps with poor quality and poor operating conditions, the flow margin should be 10%.
C. If the basic data only give weight flow, it should be converted into volume flow.
