Refrigeration cycle device

By setting branch lines and subcooling heat exchangers in the refrigeration cycle unit, and combining the opening adjustment of the expansion valve and control unit, the problem of switching between gas injection and liquid injection in mixed injection was solved, thereby achieving performance improvement and enhanced stability.

CN117098958BActive Publication Date: 2026-07-21CARRIER JAPAN CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CARRIER JAPAN CORP
Filing Date
2021-03-24
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing refrigeration cycle units cannot effectively switch between gas injection and liquid injection in mixed injection, resulting in limited performance improvement and unstable compressor cooling.

Method used

By setting up branch circuits, subcooling heat exchangers, and control units in the refrigeration cycle unit, and by adjusting the opening of the expansion valve and detecting temperature/pressure, appropriate switching between gas injection and liquid injection can be achieved, thereby controlling the superheat and discharge temperature of the refrigerant.

Benefits of technology

It improves the performance of the refrigeration cycle unit, enhances the stability of operation control, and improves the reliability of the compressor, avoiding problems such as overcooling and liquid compression.

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    Figure CN117098958B_ABST
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Abstract

The present application relates to a refrigeration cycle device provided with: a main flow path of refrigerant; a compressor; a condenser; an evaporator; a branch flow path that branches the main flow path downstream of the condenser to flow a portion of the refrigerant flowing from the condenser to the evaporator; an expansion valve that adjusts the flow rate of the refrigerant flowing in the branch flow path; a subcooling heat exchanger that exchanges heat between the refrigerant flowing in the branch flow path through the expansion valve and the refrigerant flowing in the main flow path downstream of the condenser; an injection flow path that injects the refrigerant flowing out of the subcooling heat exchanger on the branch flow path into the compressor; and a control unit. The control unit determines a determination condition for adjusting the opening degree of the expansion valve, and adjusts the opening degree of the expansion valve based on either a first target value for the discharge temperature of the refrigerant discharged from the compressor or a second target value for the superheat degree of the refrigerant flowing in the injection flow path, depending on whether the determination condition is satisfied.
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