Valve-adjusting method and valve-adjusting device for optimal opening of electronic expansion valve

Abstract

The invention provides a valve-adjusting method for the optimal opening of an electronic expansion valve. The valve-adjusting method for the optimal opening of the electronic expansion valve is used for adjusting through a method for quickly adjusting the initial opening and finding the optimal opening of a valve body through a return air superheat degree. The valve-adjusting method for the optimal opening of the electronic expansion valve comprises the steps of (1) when a refrigerating device starts running, acquiring running parameters of the refrigerating device; (2) determining the initialopening of the valve body of the electronic expansion valve according to the running parameters; (3) starting a fan, enabling the system pressure to achieve a balance, and after the fan runs for a preset time, starting a compressor; (4) after the compressor runs for a preset time, and detecting a coil temperature and a return air temperature, wherein a difference value between the coil temperature and the return air temperature is the return air superheat degree; and (5) adjusting the opening of the valve body of the electronic expansion valve according to the return air superheat degree.

Description

technical field [0001] The invention relates to a valve regulating technology of an air-conditioning heat pump system, in particular to a valve regulating method for an optimal opening degree of an electronic expansion valve. The invention also relates to a valve adjusting device for the optimal opening degree of the electronic expansion valve. Background technique [0002] The throttling part of the existing low-temperature air-conditioning heat pump system is generally an electronic expansion valve, and the opening of the valve body is controlled by the degree of superheat; increase; when the detected temperature value is lower than the minimum superheat value, the opening of the electronic expansion valve will decrease or increase according to the set valve step. [0003] Because the valve step is adjusted according to the set number of steps, the opening of the valve body increases or decreases stepwise. When the optimum opening of the valve body is between two consecu...

AI Technical Summary

Problems solved by technology

[0004] When the opening of the valve body oscillates, the heating capacity and energy efficiency ratio of the air-conditioning heat pump system will fluctuate periodically, resulting in a periodic increase or decrease in the heating or cooling capacity at the end, affecting the comfort at the end of use

[0005] The unstable opening of the valve body causes the electronic expansion to frequently send valve adjustment pulses, thereby accelerating the aging of the valve body and shortening the service life of the product

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