The hottest two small problems about pump inlet an

2022-08-22
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Two small problems about the inlet and outlet of the pump

the inlet of the pump is generally larger than the outlet, because the suction port is low pressure, the density of water is small, and the flow rate is slow. In order to meet the requirements of water supply balance and ensure that there is a certain pressure head at the inlet to prevent cavitation, it is generally large; The flow rate at the outlet is fast and the flow rate with the same pipe diameter is large, so it is decided that the connecting suction port is larger than the outlet. Large inlet diameter and small suction resistance are conducive to the medium suction of the pump, and small outlet diameter is conducive to the maintenance of pump outlet pressure

whether the diameter of the inlet and outlet pipes of the centrifugal pump is larger than that of the pump itself needs to be analyzed in detail. For most pumps, the purpose of increasing the diameter of the inlet and outlet pipes is to reduce the flow rate of fluid in the pipe, so as to reduce the resistance drop of the pipe, and finally reduce the power consumption of the pump. However, increasing the diameter is at the cost of increasing the investment cost of the pipeline that will take the lead in the market. In this way, For the long-distance pipeline at the pump outlet, it can be considered to appropriately increase the pipe diameter to reduce the resistance drop, while those in line with the national standard gb/t8809 for short distance can not be considered; As for the materials transported at the pump inlet that are liquefied gas, with a temperature close to the boiling point, a relatively low suction position, and other materials that are prone to cavitation under the recommendation of relevant departments and local governments, it should be considered to increase the diameter of the pump inlet pipe to reduce the resistance drop and avoid cavitation of the pump

generally, the diameter of the pump suction port is generally larger than the outlet diameter, and the flow rate of the suction pipe is different according to the different pipe diameters. When the pipe diameter is less than 250, it is 1 ~ 1.2m/s, and when the pipe diameter is 250 ~ 1000, it is 1.2 ~ 1.6 m/s. technically, the maximum speed of water flow should not exceed 2.5 ~ 3.0 m/s, and the minimum speed should not be less than 0.6 m/S when replacing the serial port chip (to prevent deposition)

how to judge the import and export of pumps that have been put into production

according to the type of pump, there are many kinds. The pump housekeeper thinks of the following. Welcome to leave a message and add

1. The pipe diameter at the pump outlet is generally smaller than that at the inlet

2. When looking at the pump from the motor direction, the inlet is generally at the lower right part of the pump head

3. Generally, there are pressure gauges, one-way valves, shower guides, etc. at the outlet

4. If it is not installed, the impeller outlet can be seen from the flange port

5. If the inlet and outlet of the pump are axial and radial, then the axial is the inlet and the radial is the outlet

6. If the inlet and outlet of the pump are radial, the left side is the inlet and the right side is the outlet from the motor end to the pump

7. Generally, the pump manufacturer will mark the rotation direction of the pump on the pump body, so the direction indicated by the arrow is the outlet, and vice versa is the inlet

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