Refrigerant circulation system

The refrigerant circulation system regulates superheat and flow rate to supply gas-phase refrigerant to vehicle motors, addressing agitation resistance and ensuring efficient cooling capacity.

JP2026022732APending Publication Date: 2026-02-13MAZDA MOTOR CORP
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Patent Information

Application Number
JP2024124223
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-07-31
Publication Date
2026-02-13

AI Technical Summary

Technical Problem

In refrigerant circulation systems for vehicles, particularly those with large motors, liquid refrigerant flowing into the motor creates agitation resistance and requires maintaining a low degree of superheat to ensure sufficient cooling capacity, which existing systems fail to address effectively.

Method used

A refrigerant circulation system with a refrigerant circuit including sensors and controllers to regulate the degree of superheat and flow rate, ensuring gas-phase refrigerant is supplied to the motor, using expansion valves to maintain a predetermined superheat range and bypass paths to adjust refrigerant flow as needed.

Benefits of technology

The system effectively supplies gas-phase refrigerant with controlled superheat, reducing agitation resistance and maintaining sufficient cooling capacity for the motor, even under varying cooling demands.

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Abstract

To provide a refrigerant circulation system for supplying a gas-phase refrigerant whose degree of superheat is suppressed to a small value to a motor.SOLUTION: In the refrigerant circulating system S for cooling the motor 20 in the vehicle by circulating the refrigerant R, the controller 40 estimates a degree of superheat d of the refrigerant R flowing out of the second heat exchangers 15a and 15b on the basis of a detection signal of the sensor 30, and controls flow rates of the first expansion valves 14a and 14b so as to maintain the degree of superheat d within a predetermined range between a lower limit value dt1 and an upper limit value dt2 which are greater than zero, and the controller 40 supplies the refrigerant R from the second heat exchangers 15a and 15b to the motor 20 via the flow path 3.SELECTED DRAWING: Figure 1
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Citation Information

Patent Citations

  • Electric expansion valve control device of refrigeration cycle and electric expansion valve control program

    JP2022186209A