Heat exchanger and refrigeration cycle apparatus
US-2020300515-A1 · Sep 24, 2020 · US
Pipe coupling structure and refrigeration cycle apparatus
US12055329B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12055329-B2 |
| Application number | US-202318382555-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 23, 2023 |
| Priority date | Apr 28, 2021 |
| Publication date | Aug 6, 2024 |
| Grant date | Aug 6, 2024 |
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- Title
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- Abstract
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- Assignees and inventors
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- Key dates
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- First independent claim
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- CPC / IPC classifications
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- Citations and related patents
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Abstract
Official abstract text for this publication.
A heat transfer tube as a first refrigerant pipe has a first portion, a first expansion portion, a second portion, a second expansion portion, and a third portion arranged in order. A connecting tube as a second refrigerant pipe has a fourth portion facing the second portion and a fifth portion facing the third portion. The connecting tube is inserted into the heat transfer tube. The inner diameter of the second portion is larger than the inner diameter of the first portion, and the inner diameter of the third portion is larger than the inner diameter of the second portion. The outer diameter of the fifth portion is larger than the outer diameter of the fourth portion. The fifth portion and the third portion are brazed.
First claim
Opening claim text (preview).
The invention claimed is: 1. A pipe coupling structure comprising: a first refrigerant pipe that has a first portion, a first expansion portion, a second portion, a second expansion portion, and a third portion arranged in order; and a second refrigerant pipe that is inserted into the first refrigerant pipe, has a fourth portion facing the second portion and a fifth portion facing the third portion, and has a fourth expansion portion between the fourth portion and the fifth portion, wherein the second portion has an inner diameter larger than an inner diameter of the first portion, and the third portion has an inner diameter larger than the inner diameter of the second portion, the first expansion portion is an area of the first refrigerant pipe, an inner diameter of which gradually changes from the inner diameter of the first portion to the inner diameter of the second portion, the second expansion portion is an area of the first refrigerant pipe, an inner diameter of which gradually changes from the inner diameter of the second portion to the inner diameter of the third portion, the fourth expansion portion is an area of the second refrigerant pipe, an outer diameter of which gradually changes from the outer diameter of the fourth portion to the outer diameter of the fifth portion, the fourth expansion portion is in contact with the second expansion portion, the outer diameter of the fifth portion is larger than the outer diameter of the fourth portion, and the fifth portion and the third portion are solder material. 2. The pipe coupling structure according to claim 1 , wherein a first gap between the second portion and the fourth portion is larger than a second gap between the third portion and the fifth portion. 3. The pipe coupling structure according to claim 1 , wherein the first refrigerant pipe has a third expansion portion connected to the third portion and expanded in a tapered shape from the third portion. 4. The pipe coupling structure according to claim 1 , wherein the first refrigerant pipe is a heat transfer tube of a heat exchanger, and the first portion and part of the second portion penetrate a heat transfer fin. 5. The pipe coupling structure according to claim 4 , wherein the second portion is in contact with a tube plate of the heat exchanger. 6. The pipe coupling structure according to claim 4 , wherein the other part of the second portion and the third portion are not in contact with the heat transfer fin. 7. The pipe coupling structure according to claim 5 , wherein a distance along a tube axis direction from the third portion to the tube plate is greater than a length of the third portion along the tube axis direction. 8. The pipe coupling structure according to claim 5 , wherein a distance along a tube axis direction from the third portion to the tube plate is greater than an outer diameter of the third portion. 9. The pipe coupling structure according to claim 4 , wherein the second refrigerant pipe is disposed at an outlet or inlet of the heat exchanger. 10. The pipe coupling structure according to claim 4 , wherein the first refrigerant pipe has a thickness smaller than a thickness of the second refrigerant pipe. 11. The pipe coupling structure according to claim 1 , wherein a ratio of the inner diameter of the third portion to the inner diameter of the second portion is smaller than a ratio of the inner diameter of the second portion to the inner diameter of the first portion. 12. The pipe coupling structure according to claim 1 , wherein the inner diameter of the first portion is 5 mm or less. 13. The pipe coupling structure according to claim 1 , wherein the second portion has a length longer than a length of the fourth portion. 14. The pipe coupling structure according to claim 1 , wherein at least one of the first refrigerant pipe and the second refrigerant pipe is formed from aluminum or an aluminum alloy. 15. A refrigeration cycle apparatus comprising: a refrigerant circuit through which a refrigerant circulates; and the pipe coupling structure according to claim 1 , provided in the refrigerant circuit. 16. The pipe coupling structure according to claim 2 , wherein the first refrigerant pipe has a third expansion portion connected to the third portion and expanded in a tapered shape from the third portion. 17. The pipe coupling structure according to claim 2 , wherein the first refrigerant pipe is a heat transfer tube of a heat exchanger, and the first portion and part of the second portion penetrate a heat transfer fin. 18. The pipe coupling structure according to claim 3 , wherein the first refrigerant pipe is a heat transfer tube of a heat exchanger, and the first portion and part of the second portion penetrate a heat transfer fin. 19. The pipe coupling structure according to claim 5 , wherein the other part of the second portion and the third portion are not in contact with the heat transfer fin. 20. The pipe coupling structure according to claim 5 , wherein the second refrigerant pipe is disposed at an outlet or inlet of the heat exchanger. 21. The pipe coupling structure according to claim 1 , wherein the fourth portion is positioned on an insertion direction side of the fifth portion, wherein the insertion direction is a direction of an insertion of the second refrigerant pipe into the first refrigerant pipe.
Assignees
Inventors
Classifications
Soldered joints · CPC title
Evaporators; Condensers · CPC title
Brazing of heat exchangers · CPC title
the conduits being bent, e.g. in a serpentine or zig-zag · CPC title
Combination of units extending one beside or one above the other (F28D1/0452 takes precedence) · CPC title
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US12055329B2 cover?
- A heat transfer tube as a first refrigerant pipe has a first portion, a first expansion portion, a second portion, a second expansion portion, and a third portion arranged in order. A connecting tube as a second refrigerant pipe has a fourth portion facing the second portion and a fifth portion facing the third portion. The connecting tube is inserted into the heat transfer tube. The inner diam…
- Who is the assignee on this patent?
- Daikin Ind Ltd
- What technology area does this patent fall under?
- Primary CPC classification F25B41/40. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Aug 06 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).