Explain the characteristics and classification of hydraulic oil pumps in detail

Release Date:2021-09-02

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The hydraulic oil pump is composed of a pump body, a rectangular oil tank, a pressure handle, and a high-pressure steel wire braided hose. The power element of the hydraulic system is to convert the mechanical energy of the prime mover into the pressure energy of the liquid. It refers to the oil pump in the hydraulic system. It provides power to the entire hydraulic system. The structure of hydraulic pumps generally includes gear pumps, vane pumps and plunger pumps. There are three types of hydraulic oil pump joints: straight-through, self-sealing and joints.

　　

　　Hydraulic oil pump characteristics

　　 1. The hydraulic oil pump body is small and light, easy to use, and high working pressure. 2. Single-stage pumping station: simple structure, higher working pressure can be obtained. 3. Two-stage pumping station: when low pressure, high and low pressure pumps supply oil at the same time, and a larger output flow can be obtained. At high pressure, the low-pressure pump automatically returns oil without load through the unloading relief valve. Reduce power consumption. 4. Pressure maintaining function: In the case of no leakage in the external oil circuit, stop the pump to maintain the pressure for 5 minutes, and the rated pressure will not drop by more than 5Mpa.

　　

　　 hydraulic oil pump classification

　　 According to the commonly used pump structure in hydraulic system, it is divided into three types: gear pump, vane pump and plunger pump.

　　

　　 gear pump

　　The volume is small, the structure is relatively simple, the cleanliness of the oil is not strict, and the price is relatively cheap; but the pump shaft is subject to unbalanced force, severe wear, and large leakage.

　　

　　Vane pump

　　 is divided into double-acting vane pump and single-acting vane pump. This kind of pump has uniform flow, stable operation, low noise, higher working pressure and volumetric efficiency than gear pumps, and more complicated structure than gear pumps.

　　

　　 plunger pump

　　 High volumetric efficiency, small leakage, can work under high pressure, mostly used in high-power hydraulic systems; but the structure is complex, the material and processing accuracy requirements are high, the price is expensive, and the oil cleanliness requirements are high. Generally, plunger pumps are used when gear pumps and vane pumps cannot meet the requirements. There are other types of hydraulic pumps, such as screw pumps, but their applications are not as common as the above three types.

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