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

Claim 0:
1. An internal heat exchanger comprising:
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, 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, and wherein
the inner pipe has a distal end which extends more outwardly in an axial direction than a distal end of the outer pipe, and further comprising:
a connector interposed between the outer pipe and the inner pipe and a connection target member and defines both a low-pressure communication flow path communicating the inner flow path with a refrigerant passage of the connection target member and a high-pressure communication flow path communicating the inner-outer flow path with a refrigerant flow path of the connection target member, wherein
the distal end of the outer pipe is separated from an innermost portion of an outer pipe insertion portion of the connector to form a high-pressure communication space communicating the high-pressure communication flow path, and wherein
an outer pipe side sealing member is interposed between the outer pipe and the outer pipe insertion portion of the connector to prevent a refrigerant leakage from the high-pressure communication space, and wherein
an inner pipe side sealing member is interposed between the inner pipe and an inner pipe insertion portion of the connector to prevent a refrigerant leakage from the high-pressure communication space, and 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.