A kind of electronic expansion valve control method

A technology of electronic expansion valve and control method, which is applied in heating and ventilation control systems, heating methods, household heating, etc., and can solve problems such as increased suction pressure, high and low pressure fluctuations in the system, and large opening of the electronic expansion valve. To achieve the effect of increasing the opening

CN103438547BActive Publication Date: 2016-04-20SHENZHEN MCQUAY AIR CONDITIONING

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner: SHENZHEN MCQUAY AIR CONDITIONING
Publication Date: 2016-04-20

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Abstract

The invention discloses a control method of an electronic expansion valve, including the steps of controlling the opening degree of the electronic expansion valve by adopting a suction pressure control mode after an air conditioning unit is started; judging whether the air conditioning unit exceeds the shortest suction pressure control time and meets the suction gas superheat control condition, and if so, adopting the suction gas superheat control mode is to control the opening degree of the electronic expansion valve. The suction pressure control mode is as follows: when the suction pressure of a compressor is higher than the suction pressure target value, the opening degree of the electronic expansion valve is reduced; when the suction pressure of the compressor is lower than the suction pressure target value, the opening degree of the electronic expansion valve is increased; when the suction pressure of the compressor is equal to the suction pressure target value, the opening degree of the electronic expansion valve is unchanged. The method can prevent the opening degree of the electronic expansion valve from varying due to the adoption of the suction gas superheat control when the air conditioning unit is started, and avoids influences on the life of the electronic expansion valve and the stability of the air conditioning system.

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Description

technical field

[0001] The present invention relates to the technical field of air conditioners, and more specifically, to a method for controlling an electronic expansion valve. Background technique

[0002] In air-conditioning equipment, the method of controlling the suction superheat of the compressor is usually used to adjust the opening or closing of the electronic expansion valve inside the air-conditioning equipment, so that the equipment can operate normally. Generally, when the actual suction superheat is greater than the target suction superheat, the opening of the electronic expansion valve increases; when the actual suction superheat is lower than the target suction superheat, the opening of the electronic expansion valve decreases; the actual suction superheat When it is equal to the target suction superheat degree, the opening degree of the electronic expansion valve remains unchanged.

[0003] At present, the control of the suction superheat of the electronic...

Claims

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