Method for controlling opening of electronic expansion valve in central air-conditioning unit

An electronic expansion valve, central air conditioning technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as large changes in suction superheat, affecting electronic expansion valve opening control, system instability, etc. Disturbance improvement, reducing the probability of sensor drift, and improving reliability

Active Publication Date: 2011-11-16
HAIER GRP CORP +1
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  • Abstract
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  • Application Information

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Problems solved by technology

At this time, if the pressure or temperature sensor drifts, it will cause a large change in the suction super

Method used

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  • Method for controlling opening of electronic expansion valve in central air-conditioning unit
  • Method for controlling opening of electronic expansion valve in central air-conditioning unit
  • Method for controlling opening of electronic expansion valve in central air-conditioning unit

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Embodiment Construction

[0018] For the operation of central air-conditioning units (such as water-cooled central air-conditioning units), according to different refrigerants, during normal operation, it is necessary to maintain an appropriate exhaust superheat. Affect the operation of the compressor; if the exhaust superheat is low, a large amount of liquid refrigerant will enter the compressor, causing liquid shock of the compressor, which also affects the life of the compressor; and if the exhaust superheat is too high, the condensing pressure will be too high or the suction pressure will be too high. If the temperature is too low, the system is also unstable; therefore, the basis of the entire expansion valve control is the exhaust superheat, but direct control of the exhaust superheat is difficult to control accurately, so most of the controls in the prior art are The exhaust superheat is influenced indirectly via the suction superheat control. However, due to the characteristics of the sensor, t...

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Abstract

The invention provides a method for controlling opening of an electronic expansion valve in a central air-conditioning unit, which comprises the following steps of: 1, changing the opening of the electronic expansion valve according to difference of T suction and T target; and 2, after the opening of the electronic expansion valve is changed, when a compressor in the central air-conditioning unitoperates to a first preset time, if T exhaust is not in a preset range of exhaust superheat degree, changing the T target and turning to the step 1, otherwise setting T target to be T0 target and returning to the step 1, wherein T suction refers to an actual suction superheat degree of the compressor in the central air-conditioning unit, T exhaust refers to an actual exhaust superheat degree of the compressor, T target refers to an actual target suction superheat degree of the compressor, and T0 target refers to an initial target suction superheat degree of the compressor. By the control method, interference resistance of the central air-conditioning unit is improved, and the reliability of the central air-conditioning unit is improved.

Description

technical field [0001] The invention relates to a method for controlling the opening of an electronic expansion valve in a central air-conditioning unit. Background technique [0002] In the refrigeration central air-conditioning system, there are four main components: compressor, condenser, throttling device, and evaporator. The most widely studied control logic is how to control the compressor and throttling device to make the system more efficient and stable. [0003] Usually, the throttling component of the water-cooled unit—the electronic expansion valve—is controlled based on the collected temperature and pressure sensor data. We found that during the actual operation of the water-cooled unit, the temperature sensor or pressure sensor will drift. This drift is accompanied by factors such as the sensor itself and the external environment temperature. Affected by these sensor drift factors, the electronic expansion valve The action will be affected, and then the operat...

Claims

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Application Information

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IPC IPC(8): F25B49/02
Inventor 孟庆超国德防赵雷王锡元尹叶俐
Owner HAIER GRP CORP
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