Among the various types of hydraulic pumps, the vane pu […]
Among the various types of hydraulic pumps, the vane pump is a type of pump capable of achieving lower noise due to smooth operation and small flow pulsation. However, with the development of the vane pump to high pressure and high speed, noise has become a prominent problem. In the late 1950s, a vane pump with a pressure rating of 14.0 MPa appeared in foreign countries with a noise of about 75 DB. Since 1960, foreign countries have begun to pay attention to the research of reducing vane pumps. By the end of the 1970s and the mid-1980s, a series of low-noise vane pumps with excellent performance have emerged, and the noise can generally be controlled below 65DB. Among them, Japan Oil Research's PV2R series vane pump, even as low as 51-62DB, has reached the level of noise lower than the same power motor.
The main reasons for the noise generated by the vane pump are as follows:
1. During the operation of the pump, friction, collision, etc. between the blade and the stator curve surface cause noise. The main reason for the friction between the blade and the stator is that the pressure of the blade liquid is not well balanced, and the force at the bottom is too large, which is caused by the contact between the top of the blade and the surface of the stator. There are two reasons for causing the blade to collide with the stator: one is caused by the stator curve changing the blade motion state and the vibration caused by the impact; the other is the unstable blade motion caused by the machining accuracy error of the part. of. The impact of the blade on the stator is the most basic cause of the noise generated by the vane pump, so it is very important to study the characteristics of the stator curve.
2. When the working chamber between the two blades enters the oil discharge or oil suction chamber from the oil sealing zone between the suction and discharge oil chambers, the pressure from the oil discharge chamber to the working chamber may occur from the oil discharge chamber to the working chamber. The backlash of the working chamber to the suction chamber depends on the initial volume of the working chamber and the pressure of oil discharge or oil suction. If the pressure in the oil discharge chamber is large, it will have a large impact on the blades and other components, thereby exciting the noise. This noise is called trapped oil noise.
3. Flow pulsation excites noise.
4. Cavitation noise due to poor suction performance.
The above 4 points are the common causes of the noise of the vane pump. Users can check the noise problem one by one and solve it in time to avoid causing greater losses. If technical doubts can be consulted, Taizhou Yongchang Hydraulic Machinery Co., Ltd., we Will provide quality technical support.