Patent ID: 11873935
Assignee: DENSO CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 27:
28. A refrigeration cycle apparatus comprising:
a compressor; a condenser; an expansion valve for an indoor air conditioning unit; an evaporator for the indoor air-conditioning unit; an expansion valve for a rear cooler; an evaporator for the rear cooler; and an internal heat exchanger, wherein
the internal heat exchanger includes:
an outer pipe forming an outside pipe of a double pipe; and
an inner pipe formed separately from the outer pipe and forming an inside pipe of the double pipe, and wherein
the inner pipe forms, thereinside, an inner flow path through which a refrigerant of a low-pressure side for a refrigeration cycle flows, and wherein
the inner pipe and the outer pipe form, therebetween, an inner-outer flow path through which the refrigerant of a high-pressure side for the refrigeration cycle flows, and wherein
the outer pipe has an outer diameter of 30 millimeters or less, and wherein
a ratio of a difference between an inner diameter of the outer pipe and an outer diameter of the inner pipe to the inner diameter of the outer pipe is 25% or less, and wherein
the inner pipe and the outer pipe form, therebetween, a concentric structure which maintains a flow path cross-sectional area of the inner-outer flow path and arranges the outer pipe and the inner pipe concentrically, further comprising:
a connector located at end portions of the outer pipe and the inner pipe, and forms a high-pressure communication flow path communicating the inner-outer flow path with a refrigerant flow path of a connection target member, and a low-pressure communication flow path communicating the inner flow path with a refrigerant passage of the connection target member;
an outer pipe side sealing member located at the end portion of the outer pipe to prevent a refrigerant leakage; and
an inner pipe side sealing member located at the end portion of the inner pipe to prevent a refrigerant leakage, wherein
the double pipe and the connector are mechanically fixed at a place other than places where the outer pipe side sealing member and the inner pipe side sealing member are arranged, and wherein
the concentric structure is not defined at a position where the outer pipe side sealing member and the inner pipe side sealing member are arranged, and wherein
an end portion of the outer pipe at the connector is pressed and deformed inward in the radial direction of the outer pipe over a predetermined distance, and wherein
the internal heat exchanger is interposed between the condenser and the compressor, and the expansion valve for the indoor air-conditioning unit and the expansion valve for the rear cooler, and wherein
the connector connects the high-pressure communication flow path with at least the condenser or one of the expansion valve for the indoor air-conditioning unit and the expansion valve for the rear cooler, and connects the low-pressure communication flow path with at least the expansion valve for the indoor air-conditioning unit and one of the expansion valve for the rear cooler or the compressor.