Analysis of the function of the oil leakage groove of the external meshing hydraulic gear pump

External meshing hydraulic gear pump is an important component of hydraulic system, and its performance directly affects the operating efficiency and stability of the entire system. In the design of gear pumps, the oil drain groove is a crucial element that cannot be ignored, and it plays a vital role in solving the problem of trapped oil.

A、 The occurrence of trapped oil phenomenon During the operation of the gear pump, in order to ensure continuous and smooth oil supply, the overlap coefficient of gear meshing must be greater than 1. This means that at any working moment, there is at least one pair of teeth meshing. However, this also leads to the situation where two pairs of gear teeth always mesh at the same time, forming a closed volume, namely the trapped oil zone. As the gear rotates, the volume of the trapped oil area will change, causing a sharp fluctuation in oil pressure and resulting in trapped oil phenomenon.

B、 The function of the oil drain groove In order to effectively solve the problem of trapped oil, designers have introduced a drain groove in the external gear pump. The function of the oil drain groove is mainly reflected in the following aspects: 1. Improve system stability: The application of oil drain grooves helps reduce the impact of radial force changes on gears and improve the stability and reliability of hydraulic systems. 2. Adjust pressure and flow rate: The oil discharge groove can utilize the pressure difference in the pump chamber to transmit pressure to the unloading groove through the pressure oil circuit, so that the pressure between the pump chamber and the unloading groove tends to balance. When the output pressure of the pump reaches a certain value, the pressure in the unloading tank will increase, thereby reducing the flow rate of the pump output and achieving the effect of automatic unloading. 3. Protection of hydraulic components: By adjusting the oil drain groove, it can effectively prevent the oil from being excessively squeezed or forming a vacuum in the trapped oil area, thereby protecting gears and bearings from damage caused by additional loads and extending their service life.

C、 Design considerations for oil drain groove When designing a drain groove, it is necessary to consider the impact of its size and shape on the adjustment effect. Generally speaking, the larger and more reasonable the shape of the unloading groove, the better its adjustment effect. In addition, the design of the oil drain groove needs to be optimized based on specific hydraulic system requirements and the working conditions of the gear pump. In short, the oil drain groove plays a crucial role in the external meshing hydraulic gear pump, which can effectively solve the problem of trapped oil and improve the working efficiency and stability of the hydraulic gear pump. In the design and use process, the influencing factors and optimization methods should be fully considered to ensure the normal operation and long-term stability of the hydraulic system.

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