The liquid refrigerant in the condenser is connected to the capillary through the regulating valve and the capillary is a normally closed device. The pressure value is set according to the temperature of the refrigerant, the mechanical degree of the fluid is increased, and the pressure is also increased. When the pressure exceeds this value, the regulating valve opens to inject liquid refrigerant to the compressor, and the capillary is used to adjust the amount of injection. The liquid refrigerant entering the compressor is mixed with the normal return gas, absorbs the heat of the superheated refrigerant gas and evaporates, so that the suction temperature is lowered, and the compressor motor winding is effectively cooled, so that the system can work normally under the environment of 5 ° C. To extend the life of the compressor. Vibration and noise control. The vehicle air conditioner is a split structure, the indoor unit is installed on the inner compartment wall, and the outdoor unit is connected to the compartment wall through the mounting bracket. Since the compartment and the mounting bracket are all metal members, the internal damping is small, and the vibration and radiation noise are easily excited. The inner surface material of the compartment is also made of metal material, and the sound absorption coefficient is very small. After a sound is emitted, the multiple reflections through the wall of the compartment will be lost, and the operation of the air conditioner is continuous, under continuous noise and vibration response. The compartment is equivalent to a speaker. Once the excitation frequency of the air conditioner is close to the natural frequency of the cabin, it will cause resonance, resulting in higher airborne sound, which affects the normal work of the staff. The links of the acoustic system are the sound source, the way to spread the sound, and the receptor of the sound, that is, the source of the sound source. Control noise is carried out in three aspects: sound source, pathway, and receiver protection. Controlling noise from a sound source is the most fundamental and effective means of controlling noise.
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