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Control method for protection of compressor during refrigeration cycle of direct-current frequency-conversion air conditioner

A compressor protection and refrigeration cycle technology, applied in heating and ventilation control systems, heating methods, space heating and ventilation, etc., can solve problems such as excessive liquid refrigerant, compressor damage, and insufficient refrigerant evaporation.

Inactive Publication Date: 2012-01-25
NINGBO AUX ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in a low temperature environment, when the air conditioner unit is running, the indoor temperature is often too low, so that the refrigerant in the evaporator of the indoor unit does not absorb enough heat from the indoor air, resulting in insufficient evaporation of the refrigerant, which in turn leads to the liquid being sucked into the compressor. There is too much refrigerant, the hydraulic pressure in the compressor is too large, and eventually the compressor is damaged

Method used

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  • Control method for protection of compressor during refrigeration cycle of direct-current frequency-conversion air conditioner
  • Control method for protection of compressor during refrigeration cycle of direct-current frequency-conversion air conditioner

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Embodiment Construction

[0023] The control method of the compressor protection during the refrigeration cycle in the DC inverter air conditioner of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to the following specific embodiments.

[0024] As shown in the accompanying drawings, an embodiment of the control method for compressor protection during the refrigeration cycle in the DC inverter air conditioner of the present invention, it includes the following steps:

[0025] a. Normal operation of the air conditioner;

[0026] b. Detect the suction temperature T of the compressor suction port. The suction temperature refers to the temperature of the refrigerant passing through the compressor suction port. It is customary in the industry to call it the suction temperature;

[0027] c. Determine whether the suction temperature T is greater than or equal to To, if yes, return t...

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Abstract

The invention discloses a control method for the protection of a compressor during the refrigeration cycle of a direct-current frequency-conversion air conditioner, comprising the following steps of: a, normally running the air conditioner; b, detecting a suction temperature T of a suction inlet of the compressor; c, judging whether the suction temperature T is equal to or greater than To; if so, returning to the step b; and if not, turning to the next step; d, running an outdoor fan in a low wind shift, running an indoor fan in a high wind shift, reducing the opening degree of an electronic expansion valve, and running the compressor with a reduced frequency; e, repeating the step b; and f, judging whether the suction temperature T is equal to or greater than Tr; if so, returning to the step a; and if not, returning to the step d. Through the control method, the compressor can be prevented from being slugged at low temperature.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a control method for protecting a compressor during a refrigeration cycle in a DC inverter air conditioner. Background technique [0002] The working principle of the refrigeration cycle of the DC inverter air conditioner is as follows: the refrigerant is compressed into high-temperature and high-pressure vapor by the compressor, and the refrigerant vapor releases heat in the condenser of the outdoor unit, and transfers the heat to the outdoor air, while the refrigerant vapor condenses into high-pressure steam. The liquid is then throttled by a throttling device such as an electronic expansion valve to become a low-temperature and low-pressure gas-liquid two-phase, and then passes through the evaporator of the indoor unit and absorbs the heat of the indoor air to become a low-pressure gas, and then enters the compressor. Repeat; the outdoor fan drives the outdoor air to flow aroun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/00
Inventor 郑坚江侯丽峰赵世婷
Owner NINGBO AUX ELECTRIC
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