High-frequency vibrations cause the vibration of the casing to cause high compressor noise
The motor drives the crank linkage mechanism to realize the reciprocating motion of the piston, thereby completing the compression of the refrigerant medium. On the one hand, the vibration of the casing comes from the vibration generated when the compressor is working, and is transmitted to the casing through the compression spring vibration isolation system to make the casing vibrate and radiate noise; on the other hand, the compressor is working due to vibration radiation noise and fluid noise during compression. A sound field with a large noise energy is formed in the casing. In addition, liquid disturbances in the housing directly excite the housing with vibration and noise radiation, causing the housing to vibrate and radiate noise. Obviously, improving the compression spring isolation system of the compressor can reduce the vibration energy transmitted to the casing due to the vibration of the movement, which will help reduce the noise of the compressor.
For a specific compressor vibration isolation system, the movement (separated body) is placed on four compression springs (isolator), and the compression spring is mounted on the compression spring strut (base) through the plastic post, and the compression spring strut welding On the outer casing. Due to the high frequency vibration of the movement, it is these medium and high frequency vibrations that cause the housing to vibrate, resulting in high compressor noise. This involves high frequency vibration isolation.
It can be seen from the transmission rate of the high-frequency standing wave effect time-sharing vibration system that due to the standing wave effect, the actual transmission rate at high frequencies is higher than that calculated by simple theory (ignoring the standing wave effect), and exhibits a fluctuation trend; As the mass ratio and damping ratio increase, the fluctuations tend to decrease, which means that increasing the mass ratio and damping ratio helps to improve the vibration isolation effect of the vibration isolation system. However, for the actual compressor compressor compression spring isolation system, it is very difficult to change the mass ratio. We can increase the damping of the vibration isolation system, reduce the stiffness of the vibration isolation system, increase the vibration isolation frequency range, and reduce the transmission rate. purpose.
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