Operation control method and device of air conditioning system, controller, medium and product

By adjusting the light-load and stability modes of the dual electronic expansion valve control system, the problem of unstable operation of the air conditioning system under low load and long connecting pipe projects is solved, achieving higher operational stability and cooling effect.

CN121363794APending Publication Date: 2026-01-20创维空调科技(安徽)有限公司
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Patent Information

Application Number
CN202511878922.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-12
Publication Date
2026-01-20

AI Technical Summary

Technical Problem

Existing air conditioning systems are prone to refrigerant shortages or refrigerant-laden operation under low-load conditions or with long connecting pipes, which can lead to compressor damage or unstable unit operation.

Method used

A dual electronic expansion valve control system is adopted, which adjusts the refrigerant flow through light load mode and stable mode respectively. In light load mode, the first electronic expansion valve is kept at its minimum opening, and the second electronic expansion valve is adjusted according to the exhaust temperature. In stable mode, the second electronic expansion valve is adjusted according to the difference in exhaust temperature.

Benefits of technology

It improves the operational stability and reliability of the air conditioning system under low load and long connecting pipe engineering, avoids compressor liquid operation and system fluctuations, and enhances the cooling effect.

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Abstract

The invention discloses an operation control method and device of an air conditioning system, a controller, a medium and a product. The method comprises the steps that if the frequency of a compressor is within a preset low-frequency range and the opening degree of a first electronic expansion valve is at the minimum opening degree, a light load mode is started, specifically, the first electronic expansion valve is kept at the minimum opening degree, and a second electronic expansion valve is adjusted according to the unit exhaust temperature on the basis of a first preset rule; and if the difference value between the maximum exhaust temperature value and the minimum exhaust temperature value in the preset expansion valve adjusting period is larger than a preset temperature difference threshold value and lasts for a preset period number, a stability maintaining mode is entered, and based on a second preset rule, a second electronic expansion valve is adjusted according to the exhaust temperature change difference value in the current preset expansion valve adjusting period. A double-electronic expansion valve control system is adopted, and different control modes are adopted according to the system state, so that the problem that the unit runs without fluorine or with liquid under low-load use or long connecting pipe engineering is solved.
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