CN103128519A - Manufacture method of micro-channel heat exchanger and device - Google Patents

Abstract

A method and device for manufacturing a microchannel heat exchanger in the technical field of heat exchange devices. First, the frame of the microchannel heat exchanger is formed by cold extrusion technology, and then the fins are tightly fixed to the frame of the microchannel heat exchanger through an assembly mechanism. Finally, glue is applied to the contact of the finned and flat tubes to make a microchannel heat exchanger; the microchannel heat exchanger includes: a heat exchanger frame composed of a header and a flat tube, and a A plurality of fins, wherein: the collecting pipe is provided with grooves for inserting flat tubes, and the inside of the flat tubes contains a plurality of microchannel structures. The invention solves the problem of high energy consumption in the manufacturing process of the microchannel heat exchanger, saves production energy consumption and reduces the cost of the heat exchanger.

Description

Microchannel heat exchanger manufacturing method and device

technical field

The invention relates to a method and a device in the technical field of heat exchange devices, in particular to a method and a device for manufacturing a microchannel heat exchanger.

Background technique

The micro-channel heat exchanger is a high-efficiency heat exchanger made of all-aluminum materials. Its flat tube adopts a micro-channel structure, which can strengthen condensation and boiling heat transfer, and significantly improve the heat transfer efficiency of the refrigerant side; its fins are made of high-efficiency The heat exchange fins are in the form of louvers, and the window structure can periodically interrupt the air flow boundary layer, and at the same time guide the air flow to achieve enhanced heat transfer on the air side. The micro-channel heat exchanger has the advantages of light weight, compact structure, and high heat exchange efficiency. It has a cost advantage to replace copper materials (national strategic reserve resources); at the same time, its small internal volume is conducive to greatly reducing the amount of refrigerant charge. , in line with the trend of energy saving and environmental protection

At present, the processing of micro-channel heat exchangers mainly adopts the overall brazing process. The assembled heat exchanger is placed in the brazing furnace tube belt, and the welding is completed through degreasing, spraying, drying, brazing, water cooling, air cooling and other processes. . Integral brazing requires that the heat exchanger be assembled before entering the brazing furnace, and the heat exchanger should be bound and fixed with square steel or strapping tape. If the binding force is not properly controlled, it is easy to cause false welding or wing drop during the brazing process. If the furnace temperature is not properly controlled, the header and flat tube will not be welded. More importantly, the temperature requirements of the brazing furnace are very strict, and the maximum temperature exceeds 600°C, which requires continuous consumption of a large amount of energy.

Cold extrusion is a processing method in which the metal blank is placed in the cold extrusion die cavity, and at room temperature, the punch fixed on the press is applied to the blank to force the metal scrap block to undergo plastic flow deformation to produce parts. Cold extrusion has the advantages of saving raw materials, improving labor efficiency, improving the surface accuracy and mechanical properties of parts, and reducing the cost of parts. More importantly, compared with the brazing process, cold extrusion does not need to heat the metal material, which can save a lot of energy.

Cold extrusion is a processing method in which the metal blank is placed in the cold extrusion die cavity, and at room temperature, the punch fixed on the press is applied to the blank to force the metal scrap block to undergo plastic flow deformation to produce parts. Cold extrusion has the advantages of saving raw materials, improving labor efficiency, improving the surface accuracy and mechanical properties of parts, and reducing the cost of parts. More importantly, compared with the brazing process, cold extrusion does not need to heat the metal material, which can save a lot of energy.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a method and device for manufacturing a microchannel heat exchanger, which solves the problem of high energy consumption in the manufacturing process of the microchannel heat exchanger, saves production energy consumption, and reduces the cost of the heat exchanger .

The present invention is achieved through the following technical solutions:

The invention relates to a method for manufacturing a microchannel heat exchanger. First, the frame of the microchannel heat exchanger is formed by a cold extrusion process, and then the fins are tightly fixed in the frame of the microchannel heat exchanger by an assembly mechanism, and finally the fins are fixed to the frame of the microchannel heat exchanger. Glue is applied to the contacts of the flat tubes to form a microchannel heat exchanger.

The cold extrusion process refers to: after inserting the two ends of several flat tubes of the microchannel heat exchanger frame vertically into two headers respectively, the microchannel heat exchanger frame is put into the cold extrusion die cavity, Through the fixed punch on the press, pressure is applied to the joint of the flat tube header, so that the aluminum chips at the joint produce plastic flow deformation and fill the gap between the flat tube and the header insertion slot, thus making the microchannel heat exchanger A closed cavity is formed inside.

The assembly mechanism includes: an assembly frame with fixtures and a gluing head movably arranged on the frame, wherein: the gluing head has a built-in motor connected to the controller, and is movably arranged on the vertical and horizontal assembly frame To realize automatic two-dimensional gluing, the fixture composed of limit blocks and comb teeth is fixed and set at the bottom of the assembly frame.

The number of the limiting blocks is 6, the inner sides of which are respectively in contact with the four outer surfaces of the microchannel heat exchanger frame and realize frame limiting; the comb teeth are arranged in the inner area of the limiting block and are connected The fins are in contact with each other to realize the fin limit.

The width of the comb teeth is 5mm.

The tight fixing refers to: place the microchannel heat exchanger frame on the assembly platform of the assembly mechanism and clamp it with a clamp; then raise two pairs of comb teeth between the two flat tubes on one side, so that the distance between the flat tubes is slightly It becomes larger, and finally puts the fins and puts away the comb teeth, and realizes the assembly of the fins between every two flat tubes in turn.

Since the width of the fins is larger than that of the flat tubes, the two can form a relatively stable fit.

The gluing refers to: the controller controls the gluing head to apply heat-conducting adhesive on a line where the flat tubes and fins are in contact; .

The present invention relates to the microchannel heat exchanger prepared by the above method, comprising: a heat exchanger frame composed of a header and flat tubes and a plurality of fins arranged in the heat exchanger frame, wherein: the header is provided with a It is inserted into the channel of the flat tube, and the flat tube contains multiple microchannel structures inside.

An anti-corrosion material is provided in the gap between the fins and the collector, and the anti-corrosion material is preferably sponge or plastic to prevent electrochemical corrosion caused by contact between the fins and the collector.

The fins are rolled from surface-treated aluminum foil, and the width of the fins is 0.01-0.03 mm larger than the distance between the flat tubes. It can be in the form of louvers or other high-efficiency fin forms.

The surface treatment described is achieved using various existing surface treatment coatings widely used in the air conditioning industry.

technical effect

Compared with the existing manufacturing methods of microchannel heat exchangers, the present invention has the advantages that the cold extrusion process can connect the headers and flat tubes to complete the molding of the microchannel heat exchanger frame, avoiding the high energy consumption of brazing and saving Removed large-scale equipment such as brazing furnaces, which improved production efficiency and reduced costs. The use of adhesive material instead of welding to join the fins and flat tubes makes surface treatment of the fins possible. The fin raw material can use hydrophilic (or hydrophobic) aluminum foil as needed to improve the drainage, frosting, anti-corrosion and dust accumulation performance of the heat exchanger.

Description of drawings

Fig. 1 is the frame diagram of microchannel heat exchanger;

Figure 2 is an axonometric view of the microchannel heat exchanger assembly platform;

Fig. 3 is a top view of the assembly platform of the microchannel heat exchanger;

Fig. 4 is the front view of the assembly platform of the microchannel heat exchanger;

Figure 5 is an axonometric view of a microchannel heat exchanger assembly table with a heat exchanger;

Fig. 6 is a schematic diagram of a microchannel heat exchanger;

In the figure: 10 microchannel heat exchanger frame, 20 microchannel heat exchanger assembly table, 30 microchannel heat exchanger, 1 header, 2 flat tubes, 3 fins, 4 finless area, 5 header insertion Groove, 21 bottom plate, 22 bracket, 23, 24 guide rail, 25 gluing head, 26 comb teeth (closed state), 27 comb teeth (raised state), 28 positioning fixture.

Detailed ways

The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

Example 1

As shown in Figure 1, this embodiment relates to a microchannel heat exchanger frame 10 comprising: a header 1 and a flat tube 2, wherein: the end of the flat tube 2 is inserted into the insertion groove 5 of the header 1 to a fixed depth . Put the microchannel heat exchanger frame 10 into the cold extrusion die cavity, and apply pressure to the header insertion groove 5 through the fixed punch on the press, so that the aluminum chips at the joint will undergo plastic flow deformation and fill the flat The tubes 2 and headers are inserted into the gaps between the grooves 5, so that the microchannel heat exchanger frame 10 forms a closed cavity.

As shown in FIG. 5 , the microchannel heat exchanger frame 10 is assembled on an assembly platform 20 . The microchannel heat exchanger frame 10 is placed on the assembly platform 20 and clamped and fixed with the positioning fixture 28 . Raise two pairs of comb teeth 27 between the two flat tubes on one side, so that the distance between the flat tubes increases slightly, then put the fins 3 in, and pack the comb teeth 27. According to the sequence, the assembly of the fins 3 between each two flat tubes is realized in turn; since the width of the fins 3 is larger than the distance between the flat tubes, the two can form a relatively stable fit. After completing the assembly of all the fins 3 and the flat tubes, glue is applied to the contact between the fins 3 and the flat tubes by the glue applicator 25 . The specific method is. The gluing head 25 is controlled by a program to apply heat-conducting glue on a line where the flat tube contacts the fin 3 . Follow the order of the flat tubes to complete the glue connection of all the flat tubes and the fins 3 .

As shown in Figure 6, when the assembled microchannel heat exchanger 30 is assembled, a finless area 4 is formed where the comb teeth 27 are inserted, and sponge or plastic is filled in the middle, which effectively prevents the contact between the fins 3 and the header 1. Electrochemical corrosion.

As shown in FIG. 1 , the header 1 can be, but not limited to, D-type, O-type or B-type.

As shown in FIG. 1 , the flat tube 2 can be, but not limited to, an extruded flat tube or a folded flat tube. The flat tube 2 contains multiple microchannel structures inside, and the shape of the microchannel structures is not limited.

As shown in Figure 2, the described microchannel heat exchanger assembly station 20 includes: a base plate 21, a bracket 22, guide rails 23, 24, a glue applicator 25, comb teeth 26, 27 and a positioning fixture 28, wherein: the base plate 21 can Fixed on the table surface or other planes, the guide rail 23 can slide on the guide rail 24 and achieve positioning, the glue applicator 25 can slide on the guide rail 23 and realize positioning, the comb teeth 2627 can extend out of the bottom plate 21, and the positioning fixture 28 can be adjusted according to Need to move and fix the heat exchanger to be assembled.

As shown in FIG. 5 , the fins 3 are rolled from surface-treated aluminum foil, and can be in the form of louvers or other high-efficiency fin forms. The fin width is 0.01-0.03mm larger than the flat tube spacing.

Claims (10)

1. micro-channel heat exchanger manufacture method, it is characterized in that, at first adopt cold-extrusion technology to carry out moulding to the micro-channel heat exchanger framework, then by assemble mechanism, fin closely is fixed in the micro-channel heat exchanger framework, the most backward fin flat tube contact position gluing is made micro-channel heat exchanger.

2. method according to claim 1, it is characterized in that, described cold-extrusion technology refers to: with the two ends of some flat tubes of micro-channel heat exchanger framework respectively vertical insert two headers after, the micro-channel heat exchanger framework is put into the cold extrusion die cavity, by punch fixing on forcing press, exert pressure to flat tube header junction, make the aluminium bits of joint portion produce plastic flow deformation, fill up the gap of flat tube and header insertion groove, thereby make the airtight cavity of the inner formation of micro-channel heat exchanger.

3. method according to claim 1, it is characterized in that, described assemble mechanism comprises: with the assembling frame of fixture and be movably set in gluing head on frame, wherein: the built-in motor that is connected with controller of gluing head, by realizing automation two dimension gluing on the assembling frame that is movably set in crossbar structure, the fixture that is comprised of limited block and broach is fixedly installed on the bottom of assembling frame.

4. method according to claim 3, is characterized in that, the quantity of described limited block is 6, and its inboard contacts with four lateral surfaces of micro-channel heat exchanger framework respectively, and also implementation framework is spacing; Described broach is arranged at the interior zone of limited block and contacts with fin, realizes that fin is spacing.

5. method according to claim 3, is characterized in that, the width of described broach is 5mm.

6. method according to claim 1, is characterized in that, describedly closely fixedly refers to: the micro-channel heat exchanger framework be placed on the assembly bench of assemble mechanism and use clamp; Then rise two pairs of broach between two flat tubes of a side, make the flat tube spacing become a little greatly, put at last fin and pack up broach, realize successively the assembling of fin between every two flat tubes.

7. method according to claim 1, is characterized in that, described gluing refers to: control gluing head by controller, coating heat conduction viscose on the line that flat tube contacts with fin; And the glue company that completes all flat tubes and fin according to putting in order of flat tube.

8. micro-channel heat exchanger for preparing according to the described method of above-mentioned arbitrary claim, it is characterized in that, comprise: the heat exchanger framework that header and flat tube form and be arranged at some fins in the heat exchanger framework, wherein: header is provided with for the conduit that inserts flat tube, and a plurality of MCAs are contained in flat tube inside;

Gap between described fin and header is provided with anticorrosive.

9. heat exchanger according to claim 8, is characterized in that, described anticorrosive is sponge or plastics, contacts to prevent fin the electrochemical corrosion that forms with header.

10. heat exchanger according to claim 8, is characterized in that, described fin is formed by surface treated aluminum foil rolling, and fin width is than the large 0.01-0.03mm of flat tube spacing.

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