Air conditioner and control method and device for electronic expansion valve in defrosting process of air conditioner
A technology of electronic expansion valve and control method, applied in refrigeration and liquefaction, space heating and ventilation, heating and ventilation control systems, etc., can solve problems such as control imbalance, detection temperature and pressure distortion, unit waiting for liquid, etc., to avoid control Imbalance, the effect of ensuring the stability of the system
Active Publication Date: 2017-05-24
CHONGQING MIDEA GENERAL REFRIGERATING EQUIP +1
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Problems solved by technology
The inventors of the present application found that in the process of implementing the present invention, the method of using PID to control the electronic expansion valve in the defrosting process will bring about system instability, and the temperature and pressure detected by the electronic expansion valve will be distorted, resulting in control imbalance and causing the unit to stand by. liquid, which will affect the performance of the unit for a long time
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[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0043] Such as figure 1 A control method 100 for an electronic expansion valve in defrosting of an air conditioner includes:
[0044] 110. Control the opening degree of the electronic expansion valve to the first opening degree, and switch the four-way valve, so that the air conditioner enters the defrosting mode.
[0045] Specifically, in this embodiment, the first opening degree is the pre-opening degree of the electronic expansion valve before defrosti...
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The invention relates to an air conditioner and a control method and device for an electronic expansion valve in the defrosting process of the air conditioner. The control method comprises the steps that the opening degree of the electronic expansion valve is controlled as a first opening degree, and a four-way valve is switched to enable the air conditioner to get into a defrosting pattern; when the first opening degree is kept for first time T1, the temperature of the outlet water of an evaporator under the current working condition and the control target pressure corresponding to the temperature of the outlet water are detected; the current evaporation pressure is detected; and the control opening degree of the electronic expansion valve is determined according to the control target pressure and the current evaporation pressure. The electronic expansion valve is controlled to control the opening degree so that adjustment can be carried out, the system stability can be ensured, and the problems that as the electronic expansion valve detects the temperature and the pressure in a distortion manner, control imbalance and unit liquid staying are caused, and the unit performance is affected for a long time are avoided.
Description
technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method and device for an electronic expansion valve in defrosting thereof. Background technique [0002] With the popularization of the dual system of air conditioning, the central air conditioner is not only turned on for cooling in summer, but also turned on in winter for heating, resulting in the problem of frosting. Because the outdoor temperature is very low in winter, it is easy to frost the air conditioner. Once frost forms, it will affect the operating performance of the unit. Severe frost will also lead to protection of the unit and even reduce the service life. Therefore, the defrosting of the central air conditioner is crucial. [0003] In the process of defrosting, PID control is conventionally used to control the electronic expansion valve. The inventors of the present application found in the process of implementing the pr...
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Patent Timeline
Login to View More IPC IPC(8): F24F11/00F25B47/02F25B49/00
CPCF24F11/30F24F11/42F24F11/62F24F11/64F24F11/83F24F11/84F25B47/02F25B49/00F25B2347/023F25B2600/2513
Inventor 刘雅岚梁涛杨崇银刘开胜
Owner CHONGQING MIDEA GENERAL REFRIGERATING EQUIP