Hydraulic pumps


A hydraulic pump is a mechanical device that sucks a liquid from one place through mechanical action and then pushes it to another to create a flow pressure. It is the power element of the hydraulic system, which is driven by an engine or electric motor to suck oil from the hydraulic oil tank, form a pressure oil discharge, and send it to the actuator. The main function of the hydraulic pump is to convert the mechanical energy of the power engine (such as electric motor and internal combustion engine) into the pressure energy of the liquid to provide the required energy for the hydraulic system.

Hydraulic pumps are used in a wide range of applications, including but not limited to agriculture, construction, mining, aerospace, marine, textiles, food processing, and medical devices. In these fields, hydraulic pumps are often used in various machinery for lifting, turning, braking, conveying, cutting, and pressure testing.


According to the different structures, hydraulic pumps can be divided into gear pumps, piston pumps, vane pumps and screw pumps. When selecting a hydraulic pump, there are many factors to consider, such as whether the flow rate varies (fixed or variable pump), the operating pressure of the system, the working environment (e.g., resistance to contamination sources), and noise indicators.


When using a hydraulic pump, you need to pay special attention to the following key points to ensure its proper operation and long service life:

1. Start and run: Before starting the hydraulic pump, it should be jogged several times to ensure that the direction and sound of the oil flow are normal. After that, it is operated at low pressure for a period of time before being put into normal operation. During operation, the operation of the pump should be checked regularly, such as noise, oil temperature, etc., to ensure its normal operation.

2. Oil temperature and oil: oil temperature is an important factor affecting the performance of hydraulic pumps. The oil temperature should be kept below 60°C to prevent the oil viscosity from decreasing and oxidizing. At the same time, the selected fluid should have stable oil temperature characteristics, good chemical stability, and anti-foaming properties. The oil must be kept clean and free of mechanical impurities and corrosive substances that can damage the parts of the pump.

3. Leakage and sealing: The inlet and outlet ports of the hydraulic pump should be installed firmly, and the sealing device should be reliable to prevent air inhalation or oil leakage, which will affect the performance of the hydraulic pump. At the same time, the oil leakage of the shaft and connection should be checked regularly, especially in the environment of high temperature and high pressure.

4. Precautions for special pumps: For piston pumps, the pump must be filled with clean working oil through the oil drain port on the shell before starting. At the same time, the installation of oil filters on the suction pipeline should be avoided as much as possible, and the diameter of the shut-off valve on the suction pipeline should be one stop larger than the diameter of the suction pipeline.

5. Installation and disassembly: Before installation, check whether the depth of the mounting hole is greater than the shaft extension length of the pump to prevent the phenomenon of top shaft. For pumps that need to be disassembled, they should be carried out in the prescribed order to avoid damage to the parts of the pump.


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