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Micro-channel heat exchanger and machining method thereof

A technology of microchannel heat exchanger and processing method, applied in indirect heat exchangers, heat exchanger types, additive processing, etc., can solve the problems of low thermal efficiency of microchannel heat exchangers, easy deformation of microchannels, etc., to avoid The effect of combining unevenness, avoiding clogging of etching channels, and avoiding deformation

Pending Publication Date: 2021-05-28
HARBIN ELECTRIC POWER GENERATION EQUIP NAT ENG RES CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of low thermal efficiency of the existing microchannel heat exchangers and the easy deformation of the microchannels during processing, the present invention provides a microchannel heat exchanger

Method used

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  • Micro-channel heat exchanger and machining method thereof
  • Micro-channel heat exchanger and machining method thereof
  • Micro-channel heat exchanger and machining method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] In this embodiment, the processing of the microchannel heat exchanger 1 used in the seawater working fluid heat channel for primary power generation is taken as an example. The size of the microchannel heat exchanger 1 is 100mm×100mm×100mm, and its structural diagram is as follows figure 1 , figure 2 shown.

[0038] The processing method is as follows:

[0039] 1. Through 3D unit modeling, the triangular microchannel unit 1-1 with circular arc transition is adopted. The diameter of the circumscribed circle of the triangle is 1mm. The contact area of ​​the hot and cold aisles increases.

[0040] 2. Use selected area laser 3D printing for manufacturing to realize layered additive manufacturing. The layer-by-layer printing method is as follows: image 3 Shown; Use the triangular prism mandrel ceramic mandrel 2 coated with solder resist as channel support (extracted out after manufacture), described triangular prism mandrel ceramic mandrel 2 as Figure 4 As shown, the ...

Embodiment 2

[0047] In this embodiment, the processing of the microchannel heat exchanger 1 for LNG offshore cold energy power generation applied to secondary coupling power generation is taken as an example. The size of the microchannel heat exchanger 1 is 100mm×100mm×100mm, and its structural diagram is as follows figure 1 , figure 2 shown.

[0048] The processing method is as follows:

[0049] 1. Through 3D unit modeling, the triangular microchannel unit 1-1 with circular arc transition is adopted. The diameter of the circumscribed circle of the triangle is 1mm. The contact area of ​​the hot and cold aisles increases.

[0050] 2. Use selected area laser 3D printing for manufacturing to realize layered additive manufacturing. The layer-by-layer printing method is as follows: image 3 Shown; Use the triangular prism mandrel ceramic mandrel 2 coated with solder resist as channel support (extracted out after manufacture), described triangular prism mandrel ceramic mandrel 2 as Figure ...

Embodiment 3

[0057] In this embodiment, the processing of the microchannel heat exchanger 1 used to realize high-temperature and high-pressure steam heat exchange in the field of thermal power is taken as an example. The size of the microchannel heat exchanger 1 is 100mm×100mm×100mm, and its structural diagram is as follows figure 1 , figure 2 shown.

[0058] The processing method is as follows:

[0059] 1. Through 3D unit modeling, the triangular microchannel unit 1-1 with circular arc transition is adopted. The diameter of the circumscribed circle of the triangle is 1mm. The contact area of ​​the hot and cold aisles increases.

[0060] 2. Use selected area laser 3D printing for manufacturing to realize layered additive manufacturing. The layer-by-layer printing method is as follows: image 3 Shown; Use the triangular prism mandrel ceramic mandrel 2 coated with solder resist as channel support (extracted out after manufacture), described triangular prism mandrel ceramic mandrel 2 as ...

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Abstract

The invention relates to a micro-channel heat exchanger and a machining method thereof, belongs to the technical field of heat exchangers, and aims to solve the problems that a micro-channel of an existing micro-channel heat exchanger is low in heat exchange efficiency and prone to deformation during machining. Micro-channels of the micro-channel heat exchanger are each a triangle with arc transition. The method sequentially comprises the steps of establishing a model through a 3D unit; carrying out manufacturing through selective laser 3D printing according to the established digital model, thereby realizing layered additive manufacturing; carrying out surface modification strengthening on the inner wall areas of the micro-channels; and carrying out layer-by-layer numerical control milling on a micro-channel heat exchanger blank to ensure high smoothness of the inner wall to obtain the micro-channel heat exchanger. The micro-channel units are designed into triangles with arc transition, the channels are alternating forwards and reversely, the contact area of the cold and hot channels is increased, then the heat exchange efficiency is improved, 3D printing is adopted for layered additive manufacturing, and the problem of poor micro-channel forming is avoided.

Description

technical field [0001] The invention belongs to the technical field of heat exchangers, in particular to a microchannel heat exchanger and a processing method thereof. Background technique [0002] The traditional heat exchanger has a shell + inner tube bundle structure. The tube bundle is fixed by the tube plate, and the tube ends are connected by hydraulic expansion tubes and tube end welding. Therefore, in view of the problems existing in traditional heat exchangers, a new thin-plate interlayer friction-welded microchannel heat exchanger is proposed. The heat transfer efficiency of this structure is much higher than that of traditional heat exchangers, and it can complete efficient heat transfer in a small space. . However, the processing method of this kind of microchannel heat exchanger is: processing multiple microchannels on the thin plate by laser engraving, and then assembling the processed multiple thin plates by interlayer friction welding. However, because mult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D1/053B22F10/28B22F10/40B22F10/38B22F10/66B22F10/62B33Y10/00B33Y80/00
CPCF28D1/0535B22F3/1103B22F3/24B22F3/1146B33Y10/00B33Y80/00B22F2003/247B22F2003/242
Inventor 车鹏程任志远贺怀志代海燕周竞超蔡纳新曲晓峰孙永立
Owner HARBIN ELECTRIC POWER GENERATION EQUIP NAT ENG RES CENT CO LTD
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