Refrigerant pipe

Patent metadata

Field	Value
Publication number	US-12092241-B2
Application number	US-202217813933-A
Country	US
Kind code	B2
Filing date	Jul 21, 2022
Priority date	Jan 27, 2020
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A refrigerant pipe constituting a refrigerant circuit of a refrigeration apparatus, includes: a pipe body made of stainless steel; and a first connecting tube made of copper or a copper alloy and that is configured to connect a first different refrigerant pipe to the refrigerant pipe. The first connecting tube is connected to an outer circumferential surface of a first end of the pipe body in a pipe axis direction of the pipe body. The first connecting tube overlaps with the pipe body in a pipe diameter direction in an entirety of the first connecting tube in the pipe axis direction.

First claim

What is claimed is:

1. A refrigerant pipe constituting a refrigerant circuit of a refrigeration apparatus, the refrigerant pipe comprising:
a pipe body made of stainless steel; and
a first connecting tube:
made of copper or a copper alloy,
that is a straight tube having constant outer and inner diameters and smooth outer and inner surfaces, and
that is configured to connect a first different refrigerant pipe to the refrigerant pipe, wherein

the first connecting tube is connected to an outer circumferential surface of a first end of the pipe body in a pipe axis direction of the pipe body,
the first connecting tube overlaps with the pipe body in a pipe diameter direction in an entirety of the first connecting tube in the pipe axis direction, and
the pipe body protrudes from both ends of the first connecting tube in the pipe axis direction.

2. The refrigerant pipe according to claim 1 , wherein the pipe body comprises a positioner configured to position the first connecting tube in the pipe axis direction.

3. The refrigerant pipe according to claim 2 , wherein
the pipe body comprises:
a minor diameter portion constituting the first end;
a stepped portion disposed continuously to the minor diameter portion and that has an outer diameter enlarged from an outer diameter of the minor diameter portion; and
a major diameter portion disposed continuously to the stepped portion and that has an outer diameter that is larger than the outer diameter of the minor diameter portion, and

the stepped portion constitutes the positioner.

4. The refrigerant pipe according to claim 3 , wherein the first connecting tube has an outer diameter equal to the outer diameter of the major diameter portion.

5. A refrigerant pipe constituting a refrigerant circuit of a refrigeration apparatus, the refrigerant pipe comprising:
a pipe body made of stainless steel; and
a first connecting tube made of copper or a copper alloy and that is configured to connect a first different refrigerant pipe to the refrigerant pipe, wherein
the first connecting tube is connected to an outer circumferential surface of a first end of the pipe body in a pipe axis direction of the pipe body,
the first connecting tube overlaps with the pipe body in a pipe diameter direction in an entirety of the first connecting tube in the pipe axis direction,
the first connecting tube is brazed to the first end of the pipe body with a first brazing filler material, and
the first brazing filler material has a melting point that is higher than a melting point of a second brazing filler material that brazes the first different refrigerant pipe to the first connecting tube.

6. A refrigerant pipe constituting a refrigerant circuit of a refrigeration apparatus, the refrigerant pipe comprising:
a pipe body made of stainless steel;
a first connecting tube made of copper or a copper alloy and that is configured to connect a first different refrigerant pipe to the refrigerant pipe; and
a second connecting tube made of copper or a copper alloy and that is configured to connect a second different refrigerant pipe to the refrigerant pipe, wherein
the first connecting tube is connected to an outer circumferential surface of a first end of the pipe body in a pipe axis direction of the pipe body,
the first connecting tube overlaps with the pipe body in a pipe diameter direction in an entirety of the first connecting tube in the pipe axis direction,
the second connecting tube is connected to an outer circumferential surface of a second end of the pipe body in the pipe axis direction of the pipe body,
the second connecting tube overlaps with the pipe body in the pipe diameter direction in an entirety of the second connecting tube in the pipe axis direction,
the first connecting tube is disposed at the first end of the pipe body, and
the second connecting tube is disposed at the second end of the pipe body.

Assignees

• Daikin Ind Ltd
• Fuso Ind Ltd

Inventors

• Hamadate Junichi
• Jindou Masanori
• Ye Hao

Classifications

• F16L13/08

  Soldered joints · CPC title

• F25B41/40

  Fluid line arrangements · CPC title

• B23K33/006

  for cylindrical workpieces · CPC title

• B23K31/027

  Making tubes by soldering or welding · CPC title

• B23K2103/22

  Ferrous alloys and copper or alloys thereof · CPC title