Heat exchange pipe, heat exchanger and water heating apparatus

Patent metadata

Field	Value
Publication number	US-11867428-B2
Application number	US-202017136533-A
Country	US
Kind code	B2
Filing date	Dec 29, 2020
Priority date	Apr 28, 2020
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

The present disclosure discloses a heat exchange pipe, a heat exchanger and a water heating apparatus. The heat exchange pipe comprises: a pipe body and a plurality of fins fixedly disposed to sleeve the pipe body; a flow guiding structure is provided at a partial outer edge of the fin; and a flow guiding flue is formed between the flow guiding structure and an outer wall of the pipe body. The heat exchange pipe, the heat exchanger and the water heating apparatus provided by the present disclosure can improve the flue gas flow path and the heat exchange efficiency.

First claim

What is claimed is:

1. A heat exchange having a spirally coiled heat exchange pipe which comprises a pipe body and a plurality of fins fixedly disposed to sleeve the pipe body;
wherein a flow guiding structure is provided at an outer edge of a fin of the plurality of fins;
wherein a flow guiding flue is formed between the flow guiding structure and an outer wall of the pipe body;
wherein the heat exchange pipe comprises an inner coiled pipe and an outer coiled pipe surrounding the inner coiled pipe;
wherein a partition board is provided between the inner coiled pipe and the outer coiled pipe;
wherein a flue gas outlet of the flow guiding flue of the inner coiled pipe faces the partition board;
wherein the outer coiled pipe is spirally coiled around a central axis; and
wherein an orientation of the flue gas outlet of the outer coiled pipe is parallel to the central axis.

2. The heat exchanger according to claim 1 , wherein the fin has a first portion in which the outer edge is provided with the flow guiding structure, and a second portion in which the outer edge is not provided with the flow guiding structure; in a case where a part of the fin is intercepted at a same central angle, a heat exchange area of an intercepted part of the first portion is larger than that of an intercepted part of the second portion.

3. The heat exchanger according to claim 2 , wherein in a case where a part of the fin is intercepted at a same central angle, a difference between the heat exchange area of the intercepted part of the first portion and the heat exchange area of the intercepted part of the second portion is approximately a heat exchange area of the flow guiding structure of the intercepted part.

4. The heat exchanger according to claim 1 , wherein at least a partial length of the flow guiding structure has a preset width; a direction of the width is a direction of a spacing between the fin and an adjacent fin of the plurality of fins; and the preset width is more than 0.9 times the spacing between the fin and the adjacent fin.

5. The heat exchanger according to claim 1 , wherein the fin is in contact and attached with an adjacent fin of the plurality of fins.

6. The heat exchanger according to claim 5 , wherein an attaching length of the flow guiding structure accounts for more than 0.8 of a length of the whole flow guiding structure.

7. The heat exchanger according to claim 1 , wherein at least a partial length of the flow guiding structure extends around the pipe body with a constant width.

8. The heat exchanger according to claim 1 , wherein at least a partial length of the flow guiding flue extends around the pipe body with a constant flow area.

9. The heat exchanger according to claim 1 , wherein a spacing between the outer edge of the fin that is not provided with the flow guiding structure and an outer wall of the pipe body is L1, and a spacing between the flow guiding structure and the pipe body is L2, wherein 0.5L1≤L2≤1.5L1.

10. The heat exchanger according to claim 1 , wherein the flow guiding structure extends along a circumferential direction.

11. The heat exchanger according to claim 1 , wherein the flow guiding structure is integrated with the fin, and the flow guiding structure is a flow guiding flanging located at the outer edge of the fin.

12. The heat exchanger according to claim 1 , wherein the outer edge of the fin and an outer edge of an adjacent fin of the plurality of fins circle the heat exchange pipe and are attached to each other.

13. A water heating apparatus comprising the heat exchanger according to claim 1 .

14. A heat exchange having a spirally coiled heat exchange pipe which comprises a pipe body and a plurality of fins fixedly disposed to sleeve the pipe body,
wherein a flow guiding structure is provided at an outer edge of a fin of the plurality of fins;
wherein a flow guiding flue is formed between the flow guiding structure and an outer wall of the pipe body,
wherein the heat exchange pipe comprises an inner coiled pipe and an outer coiled pipe surrounding the inner coiled pipe;
wherein a partition board is between the inner coiled pipe and the outer coiled pipe;
wherein a flue gas outlet of the flow guiding flue of the inner coiled pipe faces the partition board; and
wherein in the outer coiled pipe, the flue gas outlet of the flow guiding flue of one circle of the heat exchange pipe faces the flue gas inlet of the flow guiding flue of a next circle of the heat exchange pipe.

15. The heat exchanger according to claim 14 , wherein the fin has a first portion in which the outer edge is provided with the flow guiding structure, and a second portion in which the outer edge is not provided with the flow guiding structure; in a case where a part of the fin is intercepted at a same central angle, a heat exchange area of an intercepted part of the first portion is larger than that of an intercepted part of the second portion.

16. The heat exchanger according to claim 15 , wherein in a case where a part of the fin is intercepted at a same central angle, a difference between the heat exchange area of the intercepted part of the first portion and the heat exchange area of the intercepted part of the second portion is approximately a heat exchange area of the flow guiding structure of the intercepted part.

17. The heat exchanger according to claim 14 , wherein at least a partial length of the flow guiding structure has a preset width; a direction of the width is a direction of a spacing between the fin and an adjacent fin of the plurality of fins; and the preset width is more than 0.9 times the spacing between the fin and the adjacent fin.

18. The heat exchanger according to claim 14 , wherein the fin is in contact and attached with an adjacent fin of the plurality of fins.

19. The heat exchanger according to claim 18 , wherein an attaching length of the flow guiding structure accounts for more than 0.8 of a length of the whole flow guiding structure.

20. The heat exchanger according to claim 14 , wherein at least a partial length of the flow guiding structure extends around the pipe body with a constant width.

21. The heat exchanger according to claim 14 , wherein at least a partial length of the flow guiding flue extends around the pipe body with a constant flow area.

22. The heat exchanger according to claim 14 , wherein a spacing between the outer edge of the fin that is not provided with the flow guiding structure and an outer wall of the pipe body is L1, and a spacing between the flow guiding structure and the pipe body is L2, wherein 0.5≤L1≤L2≤1.5L1.

23. The heat exchanger according to claim 14 , wherein the flow guiding structure extends along a circumferential direction.

24. The heat exchanger according to claim 14 , wherein the flow guiding structure is integrated with the fin, and the flow guiding structure is a flow guiding flanging located at the outer edge of the fin.

25. The heat exchanger according to claim 14 , wherein the outer edge of the fin and an outer edge of an adjacent fin of the plurality of fins circle the heat exchange pipe and are attached to each other.

26. A water heating apparatus comprising the heat exchanger according to claim 14 .

27. A heat exchange having a spirally coiled heat exchange pipe which comprises a pipe body and a plurality of fins fixedly disposed to sleeve the pipe body,
wherein a flow guiding structure is pro

Assignees

• Smith A O China Water Heater
• Smith Corp A O

Inventors

• Gao Xiang
• Fang Dian
• Zhou Xiaowei

Classifications

• F24H1/43 Primary

  helically or spirally coiled · CPC title

• F24H9/0026 Primary

  in combustion gas channels · CPC title

• F28D7/04

  the conduits being spirally coiled (F28D7/10 takes precedence){(F28D7/0016 and F28D7/0033 take precedence)} · CPC title

• F24D2200/18

  Flue gas recuperation · CPC title

• F28F1/325

  Fins with openings · CPC title