CN216523335U

CN216523335U - Copper alloy micro-channel tube of air-conditioning refrigeration heat exchanger

Info

Publication number: CN216523335U
Application number: CN202123359065.XU
Authority: CN
Inventors: 林锡彬
Original assignee: Hailiang Aotuo Copper Tube Guangdong Co ltd
Current assignee: Hailiang Aotuo Copper Tube Guangdong Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-05-13
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a copper alloy microchannel tube of an air-conditioning refrigeration heat exchanger, which comprises an outer tube shell and inner ribs arranged in the outer tube shell, wherein the outer tube shell comprises a first flat wall, a first arc-shaped wall, a second flat wall and a second arc-shaped wall which are connected in sequence in a seamless manner, the first flat wall and the second flat wall are mutually parallel, the inner ribs are provided with a plurality of upper raised lines and a plurality of lower raised lines which are communicated from front to back, the tops of the upper raised lines are attached to the first flat wall and combined together through brazing, and the bottoms of the lower raised lines are attached to the second flat wall and combined together through brazing. The seamless tube outer shell avoids the problem of leakage of a welding seam part, has reliable product quality, strong corrosion resistance, good heat transfer performance, low processing cost and high production efficiency. The inner fins increase the heat transfer area of the inner surface, increase the connecting force between the first flat wall and the second flat wall and improve the integral bearable pressure of the copper alloy micro-channel tube.

Description

Copper alloy micro-channel tube of air-conditioning refrigeration heat exchanger

Technical Field

The utility model relates to a copper alloy microchannel tube of an air-conditioning refrigeration heat exchanger.

Background

Traditional air conditioner refrigeration heat exchanger adopts the pipeline of round copper pipe with outside aluminium fin structure more, along with the continuous promotion of copper and copper alloy metal price, has the pressure that the cost lasts the increase. Therefore, under the condition of keeping the heat exchange efficiency basically unchanged, the currently adopted measure for reducing the cost is the light weight of the copper pipe for the two devices (the evaporator and the condenser), namely, the design of the heat exchanger applies the way of reducing the diameter and the wall of the copper pipe. However, the light weight of the copper pipe brings along with the increase of the processing difficulty of the copper pipe and the air conditioning pipeline, the corresponding increase of the processing cost of the copper pipe with small diameter and thin wall, the increase of the processing and manufacturing cost of the air conditioner and the reduction of the pressure resistance and the corrosion resistance of the pipeline.

The other direction of cost reduction of household and commercial air conditioners is to adopt a circular aluminum pipe to replace a copper pipe, the aluminum air conditioner mainly has reduced corrosion resistance, particularly, the evaporator pipeline which is usually wet and has condensed water working conditions is easy to leak due to corrosion, and in addition, the heterogeneous metal connection between the heat exchanger pipeline of aluminum and aluminum alloy and the copper pipeline of a compressor is easy to leak due to poor welding, so that the aluminum pipe air conditioner of the type is basically absent in the domestic market at present. In another scheme, the mode of an automobile air conditioner is used for reference, an aluminum alloy micro-channel flat tube with better corrosion resistance is adopted, and an advection heat exchanger is manufactured by combining brazing with an external aluminum alloy fin. But also because of the poor corrosion resistance of the aluminum and aluminum alloy pipelines, the corrosion resistance requirement can be met only by more comprehensive design and perfect surface spraying treatment; at present, the aluminum alloy microchannel tube is still a related technology of forward extrusion of the microchannel tube, which is controlled by the manufacturer in Euramerican days, and domestic civil enterprises for producing aluminum tubes are limited by the design of a microchannel split-flow die and a material process technology related to the forward extrusion, so that strong competition is difficult to form for foreign enterprises in the aspects of capacity and product quality stability.

The heat exchanger which is made of the porous microchannel flat tube developed and manufactured by adopting copper and copper alloy has the advantages of higher working temperature adaptation, better corrosion resistance and better pressure resistance, and is the mainstream trend of high-end household and commercial air conditioners and special application heat exchangers. However, since copper and copper alloy have higher strength and higher hot working temperature than aluminum alloy, if the integral copper and copper alloy microchannel tube with a similar aluminum alloy microchannel tube structure is manufactured by adopting a forward extrusion or continuous extrusion process, the processing blank needs to be preheated at higher temperature, the required die material needs to bear higher working temperature and large deformation stress action under the condition of large extrusion ratio, for the copper and copper alloy microchannel tube which seeks to save materials, a precise and complex metal shunt welding extrusion die is inevitably required, the size of an extrusion die tongue core forming the microchannel is small and weak, and the integral copper and copper alloy microchannel tube can be processed by using a material with harsh performance requirements and high price and special surface treatment, such as application of hard alloy or special high-temperature alloy. For copper and copper alloy micro-channel tubes produced by an extrusion method, the requirements on process conditions are strict correspondingly for ensuring the metal welding quality in the extrusion process, and the problem of poor leakage of welding seam parts is easy to occur. At present, the copper and copper alloy flat tubes are mainly manufactured into the micro-channel tubes by adopting a copper and copper alloy folding and welding method, for example, the integral copper plate is bent, and the overlapped parts are brazed to form the flat tubes with the S-shaped cross section and the two-hole micro-channel structure, and the tube walls of the copper and copper alloy micro-channel tubes are actually welded with seams. However, the flat copper and copper alloy tubes with such a structure still fail to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a copper alloy microchannel tube of an air-conditioning refrigeration heat exchanger, which is used for solving the problems that in the prior art, a copper and copper alloy microchannel flat tube is difficult to process and is easy to leak at a welding seam part.

The technical scheme of the utility model is realized as follows:

the utility model aims to provide a copper alloy micro-channel tube of an air-conditioning refrigeration heat exchanger, which comprises an outer tube shell and inner fins arranged in the outer tube shell, and is characterized in that: the outer pipe shell comprises a first flat wall, a first arc-shaped wall, a second flat wall and a second arc-shaped wall which are sequentially connected in a seamless mode, the first flat wall and the second flat wall are parallel to each other, the inner ribs are provided with a plurality of upper protruding strips and a plurality of lower protruding strips which are communicated in a front-back mode, the tops of the upper protruding strips are attached to the first flat wall and combined together through brazing, and the bottoms of the lower protruding strips are attached to the second flat wall and combined together through brazing.

The outer pipe shell is formed into the flat pipe by a seamless round copper pipe through a continuous casting and rolling stretching process or a hole-shaped rolling deformation or a flat pipe hole-shaped die stretching process.

The left and right ends of the inner fin are respectively combined with the first flat wall or/and the second flat wall by brazing.

The inner fins are composed of upper fins and lower fins, the upper fins comprise first base plates, the upper raised lines are formed by bending the first base plates, the lower fins comprise second base plates, the lower raised lines are formed by bending the second base plates, and the first base plates and the second base plates are attached together.

The first base plate and the second base plate are joined together by heat brazing.

The upper raised strips and the lower raised strips are vertically aligned.

The upper raised strips and the lower raised strips are arranged at intervals up and down.

Compared with the prior art, the utility model has the following advantages:

1. the copper alloy microchannel tube of the air-conditioning refrigeration heat exchanger comprises an outer tube shell and inner ribs arranged in the outer tube shell, wherein the outer tube shell comprises a first flat wall, a first arc-shaped wall, a second flat wall and a second arc-shaped wall which are sequentially connected in a seamless mode, the first flat wall and the second flat wall are parallel to each other, the inner ribs are provided with a plurality of upper protruding strips and a plurality of lower protruding strips which are communicated from front to back, the tops of the upper protruding strips are attached to the first flat wall and combined together through brazing, and the bottoms of the lower protruding strips are attached to the second flat wall and combined together through brazing. The seamless pipe outer pipe shell avoids the problem of leakage of a welding seam part, and has reliable product quality, strong corrosion resistance, good heat transfer performance, low processing cost and high production efficiency. The inner fins increase the heat transfer area of the inner surface, increase the connecting force between the first flat wall and the second flat wall, and improve the integral bearable pressure of the copper alloy micro-channel tube.

2. Other advantages of the present invention are described in detail in the examples section.

Drawings

Fig. 1 is an exploded schematic view of a copper alloy microchannel tube of an air-conditioning refrigeration heat exchanger according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a copper alloy microchannel tube of the air conditioning refrigeration heat exchanger of the first embodiment;

fig. 3 is an exploded schematic view of a copper alloy microchannel tube of an air-conditioning refrigeration heat exchanger according to a second embodiment of the present invention;

fig. 4 is a cross-sectional view of the copper alloy microchannel tube of the air conditioning refrigeration heat exchanger of example two.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 and fig. 2, the present embodiment provides a copper alloy microchannel tube of an air-conditioning refrigeration heat exchanger, which includes an outer tube shell 1 and inner fins 2 installed inside the outer tube shell 1, and is characterized in that: the outer tube shell 1 comprises a first flat wall 11, a first arc-shaped wall 12, a second flat wall 13 and a second arc-shaped wall 14 which are connected in sequence in a seamless mode, the first flat wall 11 and the second flat wall 13 are parallel to each other, the inner fins 2 are provided with a plurality of upper protruding strips 21 and a plurality of lower protruding strips 22 which are communicated in a front-back mode, the tops of the upper protruding strips 21 are attached to the first flat wall 11 and combined together through brazing, and the bottoms of the lower protruding strips 22 are attached to the second flat wall 13 and combined together through brazing.

The copper alloy microchannel tube of the air-conditioning refrigeration heat exchanger has the advantages that the problem of corrosion leakage caused by extrusion weld defect leakage and poor zinc spraying is solved by the seamless outer tube shell, the copper and copper alloy flat tube shell has better corrosion resistance and better heat transfer performance compared with an aluminum alloy microchannel flat tube, the product quality is reliable, the processing cost is low, and the production efficiency is high. The inner fins 2 increase the heat transfer area of the inner surface, increase the connecting force between the first flat wall 11 and the second flat wall 13, and improve the integral bearable pressure of the copper alloy microchannel tube.

The outer pipe shell 1 is produced by a seamless round copper pipe by using a continuous casting and rolling stretching process or a casting, extruding, rolling and stretching process, and is processed and formed into a flat pipe by a hole-shaped roll-forming process or a flat pipe hole-shaped die stretching process.

Specifically, the circular seamless tube with a smaller outer diameter and a diameter of 4-25mm is produced by a continuous casting and rolling stretching method which has huge capacity and mature process and reliable quality at present, and is used for manufacturing a flat tube with a width of 5-30 mm, a height of 0.4-10 mm and a shell wall thickness of 0.1-2.4 mm; a smooth seamless pipe with the outer diameter of more than 25mm is subjected to hole-shaped rolling deformation or flat pipe hole-shaped die stretching technology, and the round pipe is subjected to plastic processing to form a flat pipe for manufacturing the flat pipe with the width of more than 30mm, the height of more than 10mm and the shell wall thickness of 1mm-10 mm.

The inner fins 2 are made of copper and copper alloy or other metal plates or coil by punching or rolling folding, and the thickness range is 0.05mm-3 mm.

Before the inner fins 2 are inserted into the outer tube shell 1, certain gaps exist between the inner fins and the width direction and the height direction of the inner tube shell 1, namely certain gaps exist between the upper convex strips 21 and the first flat wall 11 and between the lower convex strips 22 and the second flat wall 13, the inner fins 2 are easily inserted into the assembly process, and the inner fins 2 and the inner tube shell 1 have good mutual guiding and positioning. After the inner fins 2 are inserted, the height of the outer pipe shell 1 is properly reduced by a rolling method, so that pre-pressing stress is tightly adhered between the first flat wall 11 and the upper convex strip 21, and between the second flat wall 13 and the lower convex strip 22, and the adhering surfaces of the first flat wall 11 and the upper convex strip are combined into an integral structure after heating and brazing.

The left and right ends of the inner fin 2 are joined to the first flat wall 11 and/or the second flat wall 13 by brazing.

The upper protruding strip 21 and the lower protruding strip 22 are vertically spaced.

Example two:

as shown in fig. 3 and 4, the copper alloy microchannel tube of the air-conditioning refrigeration heat exchanger according to the present embodiment is similar to the copper alloy microchannel tube according to the first embodiment, except that:

the inner rib 2 is composed of an upper rib 23 and a lower rib 24, the upper rib 23 includes a first base 231, the upper protrusion 21 is formed by bending the first base 231, the lower rib 24 includes a second base 241, the lower protrusion 22 is formed by bending the second base 241, and the first base 231 and the second base 241 are attached together.

The inner fins 2 are composed of upper fins 23 and lower fins 24, the processing is more convenient, and the design forms of the fins can be more various.

The first base plate 231 and the second base plate 241 are joined together by heat brazing. The integrity of the copper and copper alloy micro-channel flat tube is further enhanced.

The upper protruding strips 21 and the lower protruding strips 22 are vertically spaced, or the upper protruding strips 21 and the lower protruding strips 22 may be vertically aligned.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides an air conditioner refrigeration heat exchanger's copper alloy microchannel tube, includes outer tube shell and installs the interior fin in outer tube shell, its characterized in that: the outer pipe shell comprises a first flat wall, a first arc-shaped wall, a second flat wall and a second arc-shaped wall which are sequentially connected in a seamless mode, the first flat wall and the second flat wall are parallel to each other, the inner ribs are provided with a plurality of upper protruding strips and a plurality of lower protruding strips which are communicated in a front-back mode, the tops of the upper protruding strips are attached to the first flat wall and combined together through brazing, and the bottoms of the lower protruding strips are attached to the second flat wall and combined together through brazing.

2. The copper alloy microchannel tube of an air conditioning refrigeration heat exchanger as recited in claim 1 wherein: the outer pipe shell is produced by a seamless round copper pipe by using a continuous casting and rolling stretching process or a casting, extruding, rolling and stretching process, and is processed and formed into a flat pipe by a hole-shaped rolling deformation or flat pipe hole-shaped die stretching process.

3. The copper alloy microchannel tube of an air conditioning refrigeration heat exchanger as recited in claim 2 wherein: the left and right ends of the inner fin are respectively combined with the first flat wall or/and the second flat wall by brazing.

4. The copper alloy microchannel tube of an air conditioning refrigeration heat exchanger as recited in claim 2 wherein: the inner fins are composed of upper fins and lower fins, the upper fins comprise first base plates, the upper raised lines are formed by bending the first base plates, the lower fins comprise second base plates, the lower raised lines are formed by bending the second base plates, and the first base plates are attached to the second base plates.

5. The copper alloy microchannel tube of an air conditioning refrigeration heat exchanger as recited in claim 4 wherein: the first base plate and the second base plate are combined together by heating and brazing.

6. The copper alloy microchannel tube of an air conditioning refrigeration heat exchanger as recited in claim 5 wherein: the upper raised strips and the lower raised strips are arranged in an up-and-down alignment mode.

7. The copper alloy microchannel tube of an air-conditioning refrigeration heat exchanger as recited in any one of claims 1 to 6, wherein: the upper raised strips and the lower raised strips are arranged at intervals up and down.