Four-way valve, air conditioning system and control method thereof

Abstract

The invention provides a four-way valve, an air conditioning system and a control method thereof. One of the four-way valves includes a main spool valve, the main spool valve includes a main valve body, and the main valve body has a D pipe correspondingly connected to the exhaust port of the compressor and corresponding to the suction port of the compressor. The connected S pipe also includes a pressure relief pipe, one end of the pressure relief pipe is connected to the D pipe through the pipe, and the other end of the pressure relief pipe is connected to the S pipe. The pressure relief line can be turned on or off according to the pressure difference of the refrigerant in the D pipe and the S pipe. According to a four-way valve, an air conditioning system and a control method thereof of the present invention, the pressure relief pipeline of the four-way valve can discharge the high-pressure refrigerant in the D pipe when the refrigerant pressure difference between the D pipe and the S pipe is too large. Therefore, the pressure difference of the refrigerant in the D pipe and the S pipe can be reduced, which can effectively reduce the risk of liquid hammer of the four-way valve, and can effectively reduce the probability of the occurrence of the four-way valve cross-gas phenomenon.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a four-way valve, an air conditioning system and a control method thereof. Background technique [0002] The electromagnetic four-way reversing valve (four-way valve) is an important part of the heat pump air conditioner. Its main function is to use the relative movement between the valve core and the valve body to change the direction of refrigerant flow, so that the heat pump air conditioner can achieve cooling mode. Switch between the heating mode and realize the heating and defrosting function to meet the user's demand for the heating capacity of the unit. The four-way valve is an important functional part of the heat pump air conditioner. If it fails, it will lead to the failure of important functions of the air conditioner, which will not only increase the difficulty of maintenance operations and maintenance costs, but also fail to meet the needs of use...

AI Technical Summary

Problems solved by technology

The four-way valve is an important functional part of the heat pump air conditioner. If it fails, it will lead to the failure of important functions of the air conditioner, which will not only increase the difficulty of maintenance operations and maintenance costs, but also fail to meet the needs of users and reduce user satisfaction. degree, increasing the risk of complaints

This is related to the high and low pressure difference during the reversing process of the four-way valve and the length of the two ends of the slider, which will lead to the balance of the high and low pressure difference during the reversing process of the four-way valve, which cannot overcome the sliding resistance of the slider, and then gets stuck in the middle position of the four-way valve , unable to effectively realize cooling and heating functions

Under the same pressure difference condition, if the length of the two ends of the slider is too short, it will increase the amount of crossover of the four-way valve, which will cause the slider to be stuck in a certain position and cannot be reversed normally; if the length of the two ends of the slider is too long, it will As a result, the amount of gas passing through is relatively small, especially when the high pressure is relatively high, the pressure relief cannot be effectively performed, and the risk of hydraulic shock of the four-way valve is increased. This phenomenon is even more serious for fixed-frequency machines.

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