Shanghai Yi pump analytical pipeline centrifugal pump misunderstanding

The main products of pipeline centrifugal pumps are ISG vertical pipeline centrifugal pumps, ISW horizontal pipeline centrifugal pumps, YG vertical pipeline oil pumps and other branches. Shanghai Yi pump pump technicians explain the misunderstandings of pipeline centrifugal pumps in actual use. Help the user's water pump running stable, long service life.

1. Pipe elbow in centrifugal pump inlet pipe If there are many elbows used in the inlet pipe, it will increase the local flow resistance. And the elbow should be turned in the vertical direction, not allowed to turn in the horizontal direction, so as not to gather air.

2. Pipeline Centrifugal Pump Pipeline Department Matching Some Pipeline Centrifugal Pump Users think this can increase the actual lift. Actually, the actual lift of the pump is equal to the total head to the loss head. When the pump model is determined, the total head is constant; the loss head mainly comes from the pipeline resistance, and the smaller the pipe diameter, the greater the resistance, so the greater the loss head, so after reducing the pipe diameter, the actual lift of the pump can not be increased. Instead, it will decrease, leading to a drop in pump efficiency. Similarly, when a small-diameter pump uses a large pipe to pump water, it will not reduce the actual head of the pump. Instead, it will reduce the loss head due to a reduction in the resistance of the pipe, which will increase the actual lift.

3. High-lift pumps are used for pumping low-lift pumps. Some users of centrifugal pumps believe that the lower the pumping head, the smaller the motor load. In the misunderstanding of this misunderstanding, when choosing a water pump, the head of the pump is often selected very high. In fact, for the centrifugal pump, when the pump model is determined, the power consumption is proportional to the actual flow of the pump. The flow of the pump will decrease with the increase of the head, so the higher the lift, the smaller the flow and the smaller the power consumption. Conversely, the lower the head, the greater the flow and the greater the power consumed.

4. When the bottom valve is set, the bottom section of the water inlet pipe is not vertical. If it is installed like this, the valve cannot be closed by itself, causing water leakage. The correct installation method is: The inlet pipe is equipped with a bottom valve, and the bottom section is preferably vertical. If it cannot be installed vertically due to topographic conditions, the angle between the axis of the water pipe and the horizontal plane should be above 60°.

5. The inlet of the centrifugal pump is directly connected to the elbow. This will cause uneven distribution of the water flow through the elbow into the impeller. When the diameter of the inlet pipe is larger than the inlet of the pump, an eccentric reducer should be installed. Eccentric reducer tube is to be mounted on the flat surface, and the inclined surface is mounted on the bottom. Otherwise, the air will gather, the amount of water will be reduced or the water will not be able to be pumped, and there will be a crash. If the inlet pipe and the water pump inlet diameter are equal, a straight pipe shall be added between the inlet of the pump and the elbow. The length of the straight pipe shall not be less than 2 to 3 times the diameter of the water pipe.

6. When installing the water inlet pipe, the horizontal section may be horizontal or upward. This will cause the air in the inlet pipe to collect air, reduce the degree of vacuum of the water pipe and the water pump, reduce the water absorption of the pump, and reduce the water output. The correct approach is: The horizontal section should be slightly inclined to the direction of the water source, should not be horizontal, but not upturned. (Text/YIBENG)