Liquid return judgment method and system for compressor of refrigerating system
A refrigeration system and compressor technology, applied in refrigerators, refrigeration and liquefaction, heating and ventilation control systems, etc., can solve the problems of high cost and misjudgment rate, and achieve the effect of ensuring refrigeration effect, low cost and improving accuracy
Active Publication Date: 2021-06-18
四川长虹空调有限公司
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Problems solved by technology
[0005] This invention aims to solve the problems of high cost and misjudgment rate in the existing compressor liquid return judgment method, and proposes a liquid return judgment of the refrigeration system compressor method and system
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Embodiment
[0029] The liquid return judging method of the refrigeration system compressor described in the embodiment of the present invention, such as figure 1 shown, including the following steps:
[0030] Step S1. Obtain the operating power of the compressor of the refrigeration system, the operating frequency of the compressor, and the outdoor ambient temperature according to the first preset cycle;
[0031] Among them, the outdoor ambient temperature can be obtained through the exhaust temperature sensor that comes with the refrigeration system.
[0032] In order to improve the accuracy of liquid return judgment, in this embodiment, the first preset period is preferably 1 second, and the times corresponding to the first preset period are respectively: T 0 , T 1 , T 2 , ..., the operating power of the compressor obtained at the corresponding time is: Pw 0 、Pw 1 、Pw 2 , ..., the outdoor ambient temperature obtained at the corresponding time are: Tor 0 、Tor 1 、Tor 2, ..., the ...
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The invention relates to the technical field of refrigeration, discloses a liquid return judgment method and system for a compressor of a refrigeration system, and aims to solve the problems of high cost and high misjudgment rate of an existing liquid return judgment method for the compressor. The method comprises the following steps that the compressor operation power, the compressor operation frequency and the outdoor environment temperature of the refrigerating system are obtained according to a first preset period; the change of the operation power of the compressor, the change of the operation frequency of the compressor and the change of the outdoor environment temperature at the current moment are calculated compared with that at the previous moment; and if the operation frequency of the compressor at the current moment is not changed compared with that at the previous moment, the difference value between the outdoor environment temperature at the current moment and the outdoor environment temperature at the previous moment is smaller than a first preset value, and the ratio of the operation power of the compressor at the current moment and the operation power of the compressor at the previous moment is larger than or equal to a second preset value, it is judged that the liquid return risk exists in the compressor. The cost is reduced, the accuracy of liquid return judgment is improved, and the method is suitable for air conditioners.
Description
technical field [0001] The invention relates to the technical field of refrigeration, in particular to a method and system for judging liquid return of a compressor in a refrigeration system. Background technique [0002] The main reasons for refrigerant liquid return in the refrigeration system are as follows: (1) During the installation process, there is a situation where the refrigerant is added to the pipeline, but there is no exact way to increase the amount, and it is prone to refrigerant overcharge. In the process, too much refrigerant has no place to store, occupying the internal space of the heat exchanger, resulting in that the refrigerant cannot be completely transformed into a superheated gas during the evaporation process, so that the refrigerant that returns to the compressor returns in the form of wet vapor or directly in liquid form; (2) The air conditioner is out of normal operating conditions. For special working conditions such as electronic equipment, suc...
Claims
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IPC IPC(8): F25B49/02F24F11/49F24F11/88F24F110/12
CPCF25B49/022F24F11/49F24F11/88F25B2500/28F24F2110/12Y02B30/70
Inventor 李越峰赵静
Owner 四川长虹空调有限公司