Expansion valve opening degree control method, controller, and heat pump main unit

By dynamically adjusting the opening cycle and amount of the expansion valve, the problem of excessively high exhaust temperature of the heat pump unit in low-temperature environments was solved, achieving stable operation and improved energy efficiency of the heat pump unit.

CN115875885BActive Publication Date: 2026-07-03GUANGDONG PHNIX ECO ENERGY SOLUTION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGDONG PHNIX ECO ENERGY SOLUTION
Filing Date
2022-12-29
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In low-temperature environments, the compressor exhaust temperature of the heat pump unit is too high. The opening adjustment cycle of the existing expansion valve is fixed and cannot be adjusted in time, resulting in abnormal operation or damage to the heat pump unit.

Method used

By acquiring the rate of change of the compressor's exhaust temperature, the opening adjustment cycle and amount of the expansion valve are dynamically adjusted. Combined with the compressor's frequency and temperature changes, the opening of the expansion valve is adjusted in real time to prevent the exhaust temperature from becoming too high.

Benefits of technology

It effectively prevents the compressor exhaust temperature from becoming too high, ensures the normal operation of the heat pump unit, improves the energy efficiency ratio, and shortens the start-up time.

✦ Generated by Eureka AI based on patent content.

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    Figure CN115875885B_ABST
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Abstract

This invention provides a method for controlling the opening degree of an expansion valve, a controller, and a heat pump unit. The method for controlling the opening degree of the expansion valve includes the following steps: S102: obtaining the discharge temperature change rate ΔTd of the compressor; S103: setting an adjustment period Δtc according to the discharge temperature change rate ΔTd, wherein the larger the discharge temperature change rate ΔTd, the shorter the adjustment period Δtc; S104: calculating the opening adjustment amount ΔP of the electronic main expansion valve within each adjustment period Δtc; S105: adjusting the opening degree of the electronic main expansion valve according to the calculated adjustment amount within each adjustment period Δtc. Compared with the prior art, this invention sets the adjustment period by the discharge temperature change rate to adjust the opening degree of the expansion valve in a timely manner, thereby effectively preventing the compressor discharge temperature from becoming too high under low ambient temperature conditions and ensuring the normal operation of the heat pump unit.
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