Refrigerant recovery control method and air conditioning system

Abstract

The present invention provides a refrigerant recovery control method and an air conditioning system. The refrigerant recovery control method includes the steps of: closing the high-pressure cut-off valve after receiving a liquid collection command; judging whether the system pressure is greater than the first preset pressure; if the system If the pressure is not greater than the first preset pressure, it will operate in heating mode; if the system pressure is greater than the first preset pressure, it will operate in cooling mode; close the low pressure cut-off valve. The refrigerant recovery control method described in the present invention increases the detection of system pressure in the refrigerant recovery control, so that the refrigerant recovery can only be completed after the system pressure reaches a certain value. This way of driving refrigeration oil recovery by increasing the refrigerant return speed , can achieve clean recovery of refrigeration oil, ensure that the surface of the stop valve nozzle is clean, and there is no refrigeration oil residue; and the control method is simple in principle and has a wide range of applications. It is only improved on the basis of the existing commercial inspection and testing system, and the improvement cost is low and easy. Achieve promotion.

Description

technical field [0001] The invention relates to the technical field of refrigeration oil recovery, in particular to a refrigerant recovery control method and an air conditioning system. Background technique [0002] During the commercial inspection and testing process of the air conditioning system, refrigeration recovery is required. In the prior art, during refrigeration recovery, some air-conditioning system products have a large amount of refrigerated oil residue inside the nozzle of the shut-off valve, and "bubbles" will emerge from them, and the "bubbles" will disappear after being placed for a period of time. After analysis, the "bubble" is due to the residual refrigerant in the refrigeration oil. When it is under low pressure, the refrigerant volatilizes, which looks like a leak inside the stop valve. This will cause misjudgment in production, seriously affect production efficiency, and bring Quality control risks. In addition, the refrigerated oil remaining in the...

AI Technical Summary

Problems solved by technology

After analysis, the "bubble" is due to the residual refrigerant in the refrigeration oil. When it is under low pressure, the refrigerant volatilizes, which looks like a leak inside the stop valve. This will cause misjudgment in production, seriously affect production efficiency, and bring Quality Control Risk

In addition, the refrigerated oil remaining in the nozzle of the stop valve will overflow from the nozzle, contaminate the surface of the unit, and cause customer complaints

Images