Matters Needing Attention in The Use Of Hydraulic Pumps in Hydraulic Seals

The hydraulic pump is the power component of the hydraulic system. It is driven by an engine or an electric motor, sucking oil from the hydraulic oil tank, forming a pressure oil discharge, and sending it to the actuator. Hydraulic pumps are divided into gear pumps, plunger pumps, vane pumps and screw pumps according to their structure.

I. the hydraulic pump connection precautions

1.The hydraulic pump can be installed with a support or a flange. The pump and the prime mover should use a common base support, and both the flange and the base should have sufficient rigidity. Special attention: plunger pumps with a flow rate greater than (or equal to) 160L/min should not be installed on the fuel tank.

2. An elastic coupling should be used to connect the hydraulic pump and the output shaft of the prime mover. It is strictly forbidden to install a pulley or gear on the hydraulic pump shaft to drive the hydraulic pump. If a pulley or gear must be used to connect the pump, a pair of The pulley or gear is installed with a support, and the coaxiality error between the support and the pump shaft should not be greater than 0.05mm.

3. The oil suction pipe should be as short, straight, large and thick as possible. Generally, the oil suction pipe should be equipped with a coarse filter whose nominal flow is not less than 2 times of the pump flow (the filtration accuracy is generally 80~180). The oil drain pipe of the hydraulic pump should be directly connected to the oil tank, and the back pressure of the oil return should not be greater than 0.05MPa. The oil suction pipe port and the oil return pipe port of the oil pump should be below 200mm of the low oil level of the oil tank. Pay special attention to the fact that it is not allowed to install an oil filter on the oil suction pipe of the plunger pump. The diameter of the stop valve on the oil suction pipe should be one block larger than that of the oil suction pipe. The length of the oil suction pipe is L<2500mm, and the pipe elbow should not be more than two.

4. The inlet and outlet of the hydraulic pump should be firmly installed, and the sealing device should be reliable, otherwise it will cause air inhalation or oil leakage, which will affect the performance of the hydraulic pump.

5. The self-priming height of the hydraulic pump should not exceed 500mm (or the inlet vacuum should not exceed 0.03MPa). If the oil supply pump is used for oil supply, the oil supply pressure should not exceed 0.5MPa. When the oil supply pressure exceeds 0.5MPa, the pressure resistance should be changed. sealing ring. For plunger pumps, the method of backfilling and self-priming should be adopted as far as possible.

6. Before installing the hydraulic pump, check whether the installation hole is larger than the shaft extension of the pump to prevent the phenomenon of top shaft, otherwise the pump will be burned.