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Air conditioner and control method for preventing compressor from running with liquid

A control method and compressor technology, which is applied to refrigerators, refrigeration components, mechanical equipment, etc., can solve problems such as compressor damage, and achieve the effects of improving reliability and avoiding wear and tear

Inactive Publication Date: 2019-03-22
GREE ELECTRIC APPLIANCES INC
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  • Abstract
  • Description
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Problems solved by technology

[0005] The invention proposes an air conditioner and a control method for preventing the compressor from running with liquid, and aims to solve the problem of damage to the compressor caused by the operation of the compressor with liquid

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  • Air conditioner and control method for preventing compressor from running with liquid

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the following specific examples are only used to explain the present invention, but not to limit the present invention.

[0026] At present, the frequency control of the compressor of the frequency conversion unit is basically based on the temperature control of the inlet and outlet water of the shell tube. When the water temperature is stable, the frequency of the compressor is stable. When the water temperature is unstable, it is usually based on the degree of superheat. Adjustment is made, but electronic expansion valve adjustment has limited effect. Even when the steps of the electronic expansion valve are adjusted to the minimum steps, the compressor still has the risk of running with liquid.

[0027] The control method pro...

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Abstract

The invention discloses an air conditioner and a control method for preventing a compressor from running with liquid. The control method comprises the steps of calculating the air suction superheat degree X and an exhaust superheat degree T of the compressor; carrying out frequency increase operation on the compressor when the air suction superheat degree X of the compressor is smaller than zero,and the exhaust superheat degree T of the compressor is smaller than an exhaust superheat target value T1; and carrying out decrease operation on the opening degree of an electronic expansion valve when the air suction superheat degree X of the compressor is smaller than zero of the exhaust superheat degree T1 of the compressor is smaller than the superheat degree target value T1. According to theair conditioner and the control method for preventing the compressor from running with liquid, the liquid amount of the compressor is controlled by combined action of compressor frequency and the electronic expansion valve, so that the possibility liquid impact of the compressor is reduced, the frequency of compressor damage caused by oil lack is reduced, and the reliability of the compressor andthe whole air conditioner is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner and a method for preventing compressors from running with liquid [0002] control method. Background technique [0003] In the air conditioning system, when the compressor is running with liquid, a large amount of liquid refrigerant enters the compression chamber, because the compressor cannot compress the liquid, and it will cause liquid shock, which will cause damage to the cylinder; in addition, the lubricating oil in the cylinder will dissolve in the The liquid refrigerant is taken out of the compressor, causing the compressor to be unable to lubricate due to lack of oil, and it is extremely easy to cause damage to the compressor during long-term operation. At present, most small frequency conversion units use high-pressure chamber rotor compressors. After entering the suction port, the refrigerant directly enters the oil pool at the bottom of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/30F24F11/84F25B41/06F25B41/34
CPCF24F11/30F24F11/84F25B2600/2513F25B2500/28F25B41/31Y02B30/70
Inventor 贺秋王传华孙思代园
Owner GREE ELECTRIC APPLIANCES INC
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