Double-wall pipe and refrigerant cycle device using the same

US20060096314A1Inactive Publication Date: 2006-05-11DENSO CORP +1
19 Cites 71 Cited by

Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
DENSO CORP
Publication Date
2006-05-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

A double-wall pipe includes an outer pipe provided with first and second openings, respectively, at first and second end parts of the outer pipe in a pipe longitudinal direction, and an inner pipe inserted in the outer pipe to define a passage between the outer pipe and the inner pipe. An inlet portion is connected to the outer pipe to communicate with the passage through the first opening, and an outlet portion is connected to the outer pipe to communicate with the passage through the second opening. In the double-wall pipe, the outer pipe and the inner pipe can be disposed to define an expanded portion having an expanded sectional area in the first passage, and the expanded portion can be provided at least at a portion near the inlet portion and the outer portion. The inner pipe can be provided with plural grooves in the double-wall pipe.
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Description

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application is based on Japanese Patent Applications No. 2004-325522 filed on Nov. 9, 2004, No. 2004-325521 filed on Nov. 9, 2004, No. 2005-112825 filed on Apr. 8, 2005, No. 2005-136390 filed on May 9, 2005, and No. 2005-263967 filed on Sep. 12, 2005, the contents of which are incorporated herein by reference. FIELD OF THE INVENTION

[0002] The present invention relates to a double-wall pipe constructed with an inner pipe defining an inner passage and an outer pipe enveloping the inner pipe so as to define an outer passage between the outer pipe and the inner pipe. The double-wall pipe can be suitably used for a refrigerant cycle device, for example. BACKGROUND OF THE INVENTION

[0003] A double-wall pipe is used in a refrigerant cycle device for a vehicle air conditioning system, for example.

[0004] A double-wall pipe disclosed in, for example, JP-A-2001-277842 is formed by combining a high-pressure refrigerant pipe extending between ...

Claims

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