Control method and device for electronic expansion valve of heat pump air conditioner and heat pump air conditioner
A technology of electronic expansion valve and control method, which is applied in the field of air conditioning, can solve the problems that the amount of refrigerant in the system cannot be adjusted accordingly, the adjustment effect is poor, and the adaptability is poor, so as to improve adjustment accuracy and adaptability, improve adjustment, and improve The effect of stability
Active Publication Date: 2021-02-23
CHONGQING MIDEA GENERAL REFRIGERATING EQUIP +1
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Problems solved by technology
For example, the exhaust superheat target value of some control schemes is based on the ambient temperature and water temperature look-up table, and there is a sudden change in the exhaust superheat target value, resulting in poor regulation effect
[0006] 3. Poor adaptability
The target value of exhaust superheat is based on the scheme of looking up the ambient temperature and water temperature, and it cannot be adjusted accordingly when the amount of refrigerant in the system is changed, resulting in poor adaptability
Method used
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[0043] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0044] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element refe...
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The present invention provides a method and device for controlling the electronic expansion valve of a heat pump air conditioner, and the heat pump air conditioner. The method includes the following steps: after the electronic expansion valve is pre-opened, the pressure ratio of the heat pump air conditioner is determined; and the exhaust gas is obtained according to the pressure ratio. The superheat target value; the exhaust superheat actual value and the exhaust superheat target value control the electronic expansion valve. The present invention continuously adjusts the exhaust superheat target value controlled by the electronic expansion valve based on pressure ratio changes, improves the calculation accuracy of the exhaust superheat target value, and can improve the adjustment accuracy and adaptability of the electronic expansion valve during heating, thereby Improve the stability of heat pump air conditioners.
Description
technical field [0001] The invention relates to the technical field of air conditioning, in particular to a method and device for controlling an electronic expansion valve of a heat pump air conditioner and the heat pump air conditioner. Background technique [0002] At present, in common air source heat pump units, the electronic expansion valve is generally controlled according to the suction superheat degree or exhaust superheat degree during heating operation. The disadvantage of the control based on the suction superheat is that the suction superheat in the low-temperature heating section is small and close to zero, and there are cases where the electronic expansion valve moves substantially but the suction superheat has no obvious change, resulting in poor adjustment accuracy. The control method based on the exhaust superheat degree is to obtain the superheat degree interval by looking up the table according to the ambient temperature (low pressure) and water temperatu...
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IPC IPC(8): F25B49/00
CPCF25B49/00F25B2600/2513
Inventor 张建鹏
Owner CHONGQING MIDEA GENERAL REFRIGERATING EQUIP