Heat exchanger, method for making heat exchanger, and heat exchange system

Patent metadata

Field	Value
Publication number	US-11988464-B2
Application number	US-202017135858-A
Country	US
Kind code	B2
Filing date	Dec 28, 2020
Priority date	Aug 1, 2019
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

A heat exchanger disclosed in the present disclosure includes a first collecting pipe, a second collecting pipe, a number of heat exchange tubes, at least one fin and a hygroscopic colloid. The heat exchange tube has a pipe wall and a refrigerant flow channel for a refrigerant to circulate. The heat exchange tube has a first end and a second end. The refrigerant flow channel extends from the first end to the second end along an extension direction of the heat exchange tube and extends through the heat exchange tube. The hygroscopic colloid is adhered to at least part of an outer surface of the heat exchange tube and/or the fin. The present disclosure also discloses a heat exchange system having the heat exchanger and a method for making the heat exchanger. The hygroscopic colloidal material of the present disclosure is friendly to metal surfaces.

First claim

What is claimed is:

1. A heat exchanger, comprising a first collecting pipe, a second collecting pipe, a plurality of heat exchange tubes and at least one fin;
the plurality of heat exchange tubes respectively connecting with the first collecting pipe and the second collecting pipe, the heat exchange tube comprising a pipe wall and a refrigerant flow channel for a refrigerant to circulate, the heat exchange tube comprising a first end and a second end along an extension direction of the heat exchange tube, the refrigerant flow channel extending from the first end to the second end along the extension direction of the heat exchange tube and extending through the heat exchange tube, and the refrigerant flow channel of the heat exchange tube communicating with an inner cavity of the first collecting pipe and an inner cavity of the second collecting pipe;
the fin being at least partially arranged between two adjacent heat exchange tubes;
wherein the heat exchanger further comprises a hygroscopic colloid adhered to at least part of an outer surface of the heat exchange tube and/or at least part of an outer surface of the fin;
wherein the outer surface of the fin comprises a covered area and a non-covered area, the covered area is covered with the hygroscopic colloid, and the non-covered area is not in contact with the hygroscopic colloid; and
wherein the heat exchanger further comprises at least one of (a), (b) and (c):
(a) the hygroscopic colloid is covered along a width direction of the fin, and the covered area occupies 30% to 50% of a total width of the fin;
(b) the hygroscopic colloid is covered along a length direction of the fin, and the covered area occupies 5% to 15% of a total length of the fin;
(c) the hygroscopic colloid is covered along a height direction of the fin, and the covered area occupies 10% to 30% of a total height of the fin.

2. The heat exchanger according to claim 1 , wherein the hygroscopic colloid is zinc oxide gel, and a solute of the zinc oxide gel is nano-sized zinc oxide.

3. The heat exchanger according to claim 1 , wherein a pH value of the hygroscopic colloid is between 6 to 8.

4. The heat exchanger according to claim 1 , wherein a covered thickness range of the hygroscopic colloid is 0.07 mm to 1 mm.

5. The heat exchanger according to claim 1 , wherein the first collecting pipe and the second collecting pipe are arranged in parallel, each of the first collecting pipe and the second collecting pipe has a pipe wall and the inner cavity, and the pipe wall of each collecting pipe is provided with a plurality of openings which extend through the pipe wall of the collecting pipe;
wherein the plurality of the heat exchange tubes are arranged along an axial direction of the collecting pipe, the first ends of the heat exchange tubes are inserted into the first collecting pipe through the corresponding openings, respectively, and the second ends of the heat exchange tubes are inserted into the second collecting pipe through the corresponding openings, respectively.

6. The heat exchanger according to claim 5 , wherein the fin extends along a length direction of the heat exchange tube.

7. A heat exchanger, comprising a first collecting pipe, a second collecting pipe, a plurality of heat exchange tubes and at least one fin;
the plurality of heat exchange tubes respectively connecting with the first collecting pipe and the second collecting pipe, the heat exchange tube comprising a pipe wall and a refrigerant flow channel for a refrigerant to circulate, the heat exchange tube comprising a first end and a second end along an extension direction of the heat exchange tube, the refrigerant flow channel extending from the first end to the second end along the extension direction of the heat exchange tube and extending through the heat exchange tube, and the refrigerant flow channel of the heat exchange tube communicating with an inner cavity of the first collecting pipe and an inner cavity of the second collecting pipe;
the fin being at least partially arranged between two adjacent heat exchange tubes;
wherein the heat exchanger further comprises a hygroscopic colloid adhered to at least part of an outer surface of the heat exchange tube and/or at least part of an outer surface of the fin;
wherein the fin extends along a length direction of the heat exchange tube, the outer surface of the fin comprises a covered area and a non-covered area, the covered area is covered with the hygroscopic colloid, and the non-covered area is not in contact with the hygroscopic colloid;
wherein the fin has a plurality of wave crest portions and a plurality of wave trough portions, the wave crest portions and the wave trough portions are alternately arranged along the length direction of the fin, the wave crest portion has a top end surface and the wave trough portion has a bottom end surface; the plurality of heat exchange tubes comprise a first heat exchange tube and a second heat exchange tube adjacent to the first heat exchange tube, the first heat exchange tube has a first top wall and a first bottom wall along a height direction of the heat exchange tube, the second heat exchange tube has a second top wall and a second bottom wall, the top end surface of the wave crest portion is in contact with the first bottom wall of the first heat exchange tube, the bottom end surface of the wave trough portion is in contact with the second top wall of the second heat exchange tube; the wave crest portion and/or the wave trough portion of the fin are covered with the hygroscopic colloid; at least a partial area of the wave crest portion and/or at least a partial area of the wave trough portion forms the covered area; and at least a partial area of the fin connected between the wave crest portion and the wave trough portion forms the non-covered area.

8. The heat exchanger according to claim 1 , wherein the heat exchange tube includes at least one bent portion and two straight tube sections, the two straight tube sections include a first straight tube section located on a first side of the bent portion and a second straight tube section located on a second side of the bent portion, the first side is a windward side, and a surface of the first straight tube section is covered with the hygroscopic colloid.

9. The heat exchanger according to claim 1 , wherein the heat exchange tube is a heat exchange copper tube, the fin is a sheet-shaped fin, the copper tube is inserted between the fins, and at least part of the fins is arranged between the copper tubes;
wherein at least part of the surface of the fin is covered with the hygroscopic colloid, and/or at least part of the surface of the heat exchange copper tube is covered with the hygroscopic colloid.

10. A method for making a heat exchanger, comprising:
providing a collecting pipe, a plurality of heat exchange tubes and at least one fin, inserting first ends and second ends of the plurality of heat exchange tubes into corresponding openings of the collecting pipe, respectively, assembling the fins between two adjacent heat exchange tubes, and performing a welding treatment after the assembly is completed; and
providing a hygroscopic colloid, covering the hygroscopic colloid on the heat exchanger, and then performing a low temperature curing treatment;
wherein a covering method is at least one ways of spraying, brushing and dipping, and a temperature of the curing treatment is 40° C. to 70° C.

11. The method for making the heat exchanger according to claim 10 , comprising following steps:
dissolving an appropriate amount of zinc acetate dihydrate in ethanolamine;
heating and stirring after isopropanol is added;
after the solution becomes transparent, addi

Assignees

• Hangzhou Sanhua Res Inst Co Ltd
• Zhejiang Sanhua Intelligent Controls Co Ltd

Inventors

• Zhou Jing
• Huang Hai
• Huang Ningjie

Classifications

• F28F19/06 Primary

  of metal · CPC title

• F28D1/05383

  with multiple rows of conduits or with multi-channel conduits (F28D1/05391 takes precedence) · CPC title

• F28F1/126

  consisting of zig-zag shaped fins (F28F1/105 takes precedence) · CPC title

• F28F2245/02

  hydrophilic · CPC title

• F24F13/30 Primary

  Arrangement or mounting of heat-exchangers · CPC title