Air-conditioning unit and its pressure control method

Abstract

The invention provides an air conditioning unit and a pressure control method thereof. The air conditioning unit comprises an outdoor heat exchanger tube temperature sensing bag, a first electromagnetic valve and a second electromagnetic valve which are electrically connected with a control device. As the control device receives temperature information of the outdoor heat exchanger tube temperature sensing bag and controls on and off of the first electromagnetic valve and the second electromagnetic valve, the control device can automatically conduct flow adjustment according to pressure changes, the pressure of the unit can be kept within an appropriate scope under any environmental condition, and the air conditioning unit runs in the hostile environment; when it is detected that the pressure of the system is too high, the refrigerant flow entering an evaporator is automatically reduced, the evaporating pressure of the system is reduced, the running exhaust pressure of the unit is further reduced, and it is guaranteed that the unit can stably run. The problem that the air conditioning unit cannot run under the hostile working condition when the pressure is too high is solved, and the running reliability and the running comfort of the unit are greatly improved.

Description

technical field [0001] The invention relates to the technical field of structure and control of an air conditioning unit, in particular to an air conditioning unit and a pressure control method thereof. Background technique [0002] At present, during the operation of many air conditioning units, when the ambient temperature is too high, the system pressure is usually relatively high. In order to reduce the system operating pressure and ensure the reliability of operation, many units are often equipped with pressure switches or anti-high temperature Protective function. Its working principle is: the compressor compresses the refrigerant of the evaporator (actually a refrigerant, such as R22), and then sends it to the condenser for cooling. When the ambient temperature is higher, due to the high temperature of the condenser, the refrigerant cannot be liquefied, the pressure rises, and other reasons cause the pressure of the pipeline to rise. In order to avoid serious failure...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an air-conditioning unit and its pressure control method, so that the air-conditioning unit can maintain the pressure within a suitable range under any environmental conditions, and solve the problem of excessive pressure of the air-conditioning unit under severe working conditions. The problem of high inability to operate greatly improves the reliability and comfort of the air conditioning unit operation

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