Title:
REFRIGERANT PIPE JOINT STRUCTURE
Document Type and Number:
WIPO Patent Application WO/2020/174517
Kind Code:
A1
Abstract:
The purpose of the present invention is to obtain a refrigerant pipe joint structure in which the productivity of a flare nut provided with a water-draining hole is improved, and cost is minimized while maintaining reliability against refrigerant leakage. This invention comprises: a copper pipe provided with a pipe part and a flare part in which both ends of the pipe part are enlarged into tapers; a union formed into a taper at a distal end part and provided with a refrigerant flow channel along a center axis; and a flare nut provided with a female screw part that threads together with the union. The flare nut is provided with a through-hole through which the pipe part of the copper pipe is passed, a relief shape formed in an end part of the female screw part, a tapered flare seat surface formed between the relief shape and the through-hole, and a communication hole allowing communication between the relief shape and an external space. The union is provided with a tapered seat surface at the distal end and a male screw part formed in a side surface and is fastened by threading together with the female screw part, the flare part of the copper pipe is held between the flare seat surface and the seat surface of the union, the communication hole opens into the end surface in which the female screw part is formed, and the center axis of the communication hole is parallel to the center axis of the female screw part.
Inventors:
NISHIDA SOSUKE (JP)
MAKINO HIROAKI (JP)
MAKINO HIROAKI (JP)
Application Number:
PCT/JP2019/006982
Publication Date:
September 03, 2020
Filing Date:
February 25, 2019
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
F16L19/028
Foreign References:
| JPS545817U | 1979-01-16 | |||
| DE1775199A1 | 1971-07-22 | |||
| JPS5582578U | 1980-06-06 | |||
| JPS61188089U | 1986-11-22 | |||
| JPS60116485U | 1985-08-06 | |||
| JPS5693585U | 1981-07-25 | |||
| JP2009085430A | 2009-04-23 | |||
| JP2016065614A | 2016-04-28 | |||
| JPH06147372A | 1994-05-27 | |||
| US20050275222A1 | 2005-12-15 | |||
| JP2000161548A | 2000-06-16 | |||
| JPS58180893A | 1983-10-22 |
Attorney, Agent or Firm:
KISA PATENT & TRADEMARK FIRM (JP)
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