KR20070031053A - Flange and pipe assembly structure for condenser of automobile - Google Patents

Abstract

The present invention can minimize the manual welding through the brazing process between the joint flange and the in / out pipe, reduce the defect rate related to the joint state, improve the productivity and reduce the manufacturing cost of flange pipe for automobile condenser We want to provide an assembly structure.

Flange pipe assembly structure for automobile condenser of the present invention is a clad material of aluminum alloy selected from the clad aluminum alloy group including aluminum alloy number AL4343, AL4045, AL4N43, AL4N45; Including a core material of one kind of aluminum alloy selected from the clad aluminum alloy group including the aluminum alloy number AL3003, AL3N03, AL3N33, AL3005, AL3N43, AL6951, laminated the material 36 on one or both sides of the core material 35 Coalesced in / out pipes 30 and 40; A joint flange (10) in which one end (31, 41) of each of the in / out pipes (30, 40) is fusion-fixed through brazing; The other end 32, 42 of each of the in / out pipes 30, 40 includes a header tank 20 in which fusion is fixed through the brazing process.

Clad, Aluminum, Alloy, Pipe, Brazing, Joint Flange

Description

FLANGE AND PIPE ASSEMBLY STRUCTURE FOR CONDENSER OF AUTOMOBILE}

1 is a cross-sectional view for explaining a fastening structure of an aluminum alloy tube according to the prior art,

Figure 2 is an overall perspective view for explaining the configuration of the flange pipe assembly structure for an automobile condenser according to an embodiment of the present invention,

2a to 2c are perspective views and enlarged cross-sectional view for explaining the manufacturing method of the in / out pipe shown in FIG.

3A and 3B are enlarged cross-sectional views of circle A (A ') shown in FIG. 2;

4A and 4B are enlarged cross-sectional views of circle B (B ') shown in FIG.

<Description of Symbols for Main Parts of Drawings>

10: joint flange 20: header tank

30, 40: in / out pipe 35: core material

36: felling 50, 60: first, second fixing clip

100: basic brazing sheet 150: individual brazing sheet

FIELD OF THE INVENTION The present invention relates to the construction of flanged pipe assemblies for automotive condensers, and more particularly, to interconnecting in / out pipes to joint flanges and header tanks that serve as input and output without individual welding by brazing. Relates to a flange pipe assembly structure for an automobile condenser.

In general, KS D 7043 of the Korean Industrial Standards relates to aluminum alloy brazing filler metals and brazing sheets, types of aluminum alloy solder (hereinafter referred to as 'solder') and brazing sheets used for soldering. It defines the quality, dimensions and tolerances, tests and inspections, and how to label and label products.

Here, looking at the definition of the term, sheet and plate mean the thin clad aluminum alloy sheet material in the same concept.

In addition, a solder means using it independently or using it as a covering material of a brazing sheet.

In addition, the core material is the main aluminum alloy constituting the brazing sheet, which means that the solidus temperature is higher than the liquidus temperature of the solder.

In addition, a material means the solder clad on the surface of a core material.

In addition, the sacrificial cathode material means an aluminum alloy having a lower potential state than the core material clad on the surface of the core material.

In addition, a cladding rate means the ratio (%) of the thickness (one side) of a workpiece with respect to the thickness of a brazing sheet.

Core material, shell material and sacrificial anode material are all classified in the form of 'aluminum alloy number'. The aluminum alloy number is represented by a four-digit number consisting of 'AL' and a number or letter, and is called a series including the first and second numbers.

For example, in the case of aluminum alloy AL3003, it means any one aluminum alloy selected from the AL30 series selected from the aluminum alloy group.

The sacrificial cathode material is named under the concept of protecting the core material by sacrificing the core content of the core material by the potential difference in the relationship between the core material and the core material, and means a clad material clad on the surface of the core material in the description of the present invention.

Details of the chemical composition of the core material and material (sacrificial anode material), the type of brazing sheet using the core material and the material, the type, size and tolerance of the brazing sheet, the standard dimensions of the brazing sheet, and the cladding ratio of the cladding of the material of the brazing sheet. The description is disclosed in KS D 7043 and will be omitted here.

In addition, the aluminum and aluminum alloy welded tube of KS D 6713, which is another technical standard for better understanding of the present invention, is manufactured by integrating the aforementioned brazing sheet by high frequency induction heating welding (hereinafter referred to as 'welding'). Or it is manufactured to have a tube shape.

Although these technical specifications are known in the art, there is still no product or technology in which aluminum alloy pipes are applied to joint flanges or header tanks for automobile condensers. Still, the simple wire welding method as shown in FIG. In accordance with the present invention, a flange pipe assembly for an automobile condenser is constructed.

As shown in FIG. 1, in the aluminum alloy tube assembly structure according to the prior art, a pure aluminum alloy tube 1 made of a material of AL30 series (eg AL3003) or AL50 series (eg AL5052) is used.

The end of the conventional pure aluminum alloy tube (1) is inserted into the insertion hole (2) of the assembly portion (3), and then the corner of the outer surface that is not limited in the welding direction, that is, the simple aluminum alloy tube (1) Only the joining portion 5 corresponding to the initial portion of the insertion hole 2 which is in contact with the outer peripheral surface of the end is manually welded using the aluminum alloy wire 4, respectively.

For example, in joint flanges and in / out pipe assemblies (hereinafter referred to as 'flange pipe assemblies') including header tanks of automotive condensers, two places on the joint flange side and two places on the header tank side are manually applied. As welding is carried out, manufacturing cost increases and mass production efficiency is lowered, and defects are increased at joining portions due to manual welding.

In addition, the outer peripheral surface of the end portion of the aluminum alloy tube 1 except for the joining portion 5 maintains a simple surface contact with the insertion hole 2 of the corresponding assembly portion 3, so that the clamping force is relatively lowered so that the pressure resistance test pressure is reduced. It is impossible to produce high quality products.

In addition, since the conventional pure aluminum alloy tube (1) itself is a material that is not fused to the joint flange by the brazing method disclosed above, it is a structure that can be manufactured by the brazing method, but can be welded quickly and precisely in both the joint flange or the header tank. There is also an urgent need for the development of technology for pipe materials with little width of the non-clad area or low flux.

The present invention has been made in order to solve the problems of the prior art as described above, it is possible to minimize the manual welding through the brazing process between the joint flange and the in / out pipe, it is possible to reduce the failure rate related to the joint state, The present invention provides a flanged pipe assembly structure for an automobile condenser that can improve mass production and reduce manufacturing costs.

An object of the present invention as described above, and the material is one aluminum alloy selected from the clad aluminum alloy group including aluminum alloy number AL4343, AL4045, AL4N43, AL4N45; In the flange pipe assembly structure for automobile condenser including a core material of aluminum alloy selected from the clad aluminum alloy group including aluminum alloy number AL3003, AL3N03, AL3N33, AL3005, AL3N43, AL6951, one side or both sides of the core material An in / out pipe which is laminated and coalesced; A joint flange in which one end of each of the in / out pipes is fused and fixed through brazing; The other end of each of the in / out pipes is achieved by a flanged pipe assembly structure for an automobile condenser comprising a header tank fusion-fixed through brazing.

In addition, according to the present invention, the material of the part inserted into the connection hole of the joint flange of one end of each of the in / out pipe is a sacrificial cathode material which is melted by the brazing processing temperature transmitted through the brazing process, Except for the entire inner circumferential surface of the connecting hole except the insertion hole and the end portion is preferably fused.

In addition, according to the present invention, the other end of each of the in / out pipes and the portion inserted into the entrance hole of the header tank and integral flange bottom surface material; Each of the peripheral materials of the access hole is a sacrificial anode material that is melted by the brazing processing temperature transmitted through the brazing process, and is preferably uniformly and firmly fused at the entire inner circumferential surface of the access hole, at the insertion start and end portions.

In addition, according to the present invention, it is preferable that the in / out pipe is constructed to minimize the width of the non-clad region by using the basic brazing sheet.

In addition, according to the present invention, the basic brazing sheet and the material having a thickness ratio of 10%; The core member having a thickness ratio of 90%; And a plurality of welding supplements formed between the material and the core so as to have a thickness relatively thicker than the thickness of the material as the material, wherein the plurality of welding supplements are in the width direction of the basic brazing sheet. It is preferable to arrange | position so as to maintain equal intervals.

Hereinafter, a flange pipe assembly structure for a car condenser according to a preferred embodiment of the present invention with reference to the accompanying Figures 2 to 4b will be described in detail.

2 is an overall perspective view for explaining the configuration of the flange pipe assembly structure for an automobile condenser according to an embodiment of the present invention, Figures 2a to 2c is a manufacturing method of the in / out pipe shown in FIG. Perspective and enlarged cross-sectional views for explanation. 3A and 3B are enlarged cross-sectional views of circle A (A ') shown in FIG. 2, and FIGS. 4A and 4B are enlarged cross-sectional views of circle B (B') shown in FIG.

As shown in FIG. 2, the flange pipe assembly structure for an automobile condenser includes a joint flange 10, a header tank 20, an in pipe 30, an out pipe 40, a first and a second fixing clip 50. 60).

The first and second fixing clips 50 and 60 are made of a clad aluminum alloy material having a material or a core material disclosed in the present invention, and are fixed to the header tank 20 through a brazing method, and thus to the header tank 20. It serves as a holder for holding the in / out pipes 30 and 40 or as a bracket for fixing the header tank 20 to a predetermined mounting position.

The joint flange 10 is a material of one type of aluminum alloy selected from clad aluminum alloy groups such as AL3003 (melting temperature: 650 ° C.), AL3N03, AL3N33, AL3005, AL3N43, AL6951, and the like, which will be described below. It is preferable to have the same or equivalent melting temperature as the core material of the 30 and the out pipe 40 (also referred to as in / out pipe in the description of the present invention or in the following claims).

The joint flange 10 is fixed to one side of the fixed end on the outer surface of the header tank 20, the fixing method is a rivet fastening method, a welding method.

The joint flange 10 extends smoothly and vertically at one fixed end thereof to have a substantially '-' shape, and fastens the in pipe 30 and the out pipe 40 to the other fixed end in a thickness direction. have.

Here, the in-pipe 30 and the out-pipe 40 refer to the same clad aluminum alloy pipe manufactured by the same manufacturing method except for simple design differences such as diameter, length, and thickness difference.

The other fixed end of the joint flange 10 is formed with a plurality of connecting holes 19 penetrating in the thickness direction as indicated by a dotted line (see FIG. 3A or FIG. 3B).

One end 31 and 41 of the in pipe 30 and the out pipe 40 are respectively inserted into the corresponding connecting holes 19 of the joint flange 10 and then fused by the brazing method as will be described in detail below. .

The other ends 32 and 42 of the in pipe 30 and the out pipe 40 are inserted into the inlet and outlet holes 29 of the header tank 20, respectively, and are then fused by the brazing method (see FIGS. 4A and 4B). ).

The header tank 20 is a semi-circular tube-shaped header having a plurality of slits and a semi-circular tube-shaped tank having no slits to be fused by a brazing method to have a tube or tank shape, and the material thereof is capable of brazing fixing. It is made of clad aluminum alloy.

That is, the header tank 20 is also made of the core material or the material of the material described throughout the present invention.

The in pipe 30 and the out pipe 40 may be manufactured by a conventional clad pipe tube method, and have a flux usage amount of 0.01 mm to 1 mm with little or no width of the non-clad area to be described below. It is manufactured by the method of pipe cladding which is less consumed.

Clad pipe tube method disclosed in the present invention is a cladding material of one aluminum alloy selected from the clad aluminum alloy group such as AL4343 (melting temperature: 610 ℃), AL4045, AL4N43, AL4N45 and the like; Brazing sheet is made of double or triple laminated core material of aluminum alloy selected from clad aluminum alloy group such as AL3003 (melting temperature: 650 ℃), AL3N03, AL3N33, AL3005, AL3N43, AL6951.

At this time, a predetermined pipe manufacturing apparatus for performing the tube and welding process using the brazing sheet is strip welding machine (strip welding machine), tensioner looper (looper), high frequency induction heating welding device (HF welding machine), DDS cutting machine.

Here, the high-frequency induction heating welding apparatus includes an impeller (core) inserted into the axis of the tube before welding, an induction coil disposed in a state spaced apart from the outer circumference of the tube, It includes a pair of pressure rolls with semicircular grooves on both sides relative to the point corresponding to the welding point.

Tubes before welding are tubular tubularly pre-cut individual brazing sheets (or plates) that have a width corresponding to the circumferential distance of the finished product plus the distance considering the weld loss ratio. It refers to an unfinished tube which is supplied to the high frequency induction heating welding device while maintaining the non-contact angle of inclination, that is, the non-angle angle, of 4 ° to 7 ° in a state where both ends of the direction are rolled in a tube shape.

Hereinafter, the brazing sheet of the present invention will be described in order to manufacture the pipe bodies of the in pipe 30 and the out pipe 40 using the pipe manufacturing apparatus described above.

The in / out pipes 30 and 40 in the present invention are manufactured using the basic brazing sheet 100 described below.

As shown in FIGS. 2A to 2C, the basic brazing sheet 100 to be described in the present invention has a characteristic structure (eg, the welding supplement 112) that can minimize the width w of the non-clad region. It is material.

The basic brazing sheet 100 includes a material 36 having a thickness ratio of 10% as one aluminum alloy (eg, AL4343) material selected from the group of clad aluminum alloys; One other aluminum alloy (for example, AL3003) material selected from the clad aluminum alloy group includes a core material 35 having a thickness ratio of 90%, wherein the material material 36 is formed on one or both surfaces of the core material 35. ) And a plurality of welding supplements 112 having the same thickness as that of the workpiece 36 and having a thickness relatively thicker than that of the workpiece 36. Formed therebetween, the plurality of welding supplement portion 112 is to be arranged so as to maintain an equal interval f in the width direction of the basic brazing sheet (100).

The intermediate portion 111 of the workpiece 36 is positioned between each weld supplement 112. In addition, the upper portion of the core 35 is formed with a groove 122 extending in the longitudinal direction at a position corresponding to the welding supplement portion 112.

When the basic brazing sheet 100 is completed, secondary processing is performed for fabrication of the individual brazing sheet 150 (see FIG. 2B) for the in pipe 30 and the out pipe 40.

That is, in the secondary processing, the basic brazing sheet 100 is cut based on the cutting lines 140 and 141 passing through the welding supplementary portion 112 by a predetermined cutting device, so as to the individual brazing sheet 150. Are separated.

The individual brazing sheet 150 is provided with half welding supplements 112a and 112b formed at both ends by cutting the welding supplement portion 112 in half, corresponding to the above-described equal interval f. A width equal to a value obtained by adding the distance in consideration of the weld loss ratio to the circumferential distances of the out / out pipes 30 and 40; It is preferable to have the length equal to and the sheet length relatively larger than the axial length of the in / out pipes 30 and 40.

In addition, since the semi-weld supplements 112a and 112b are provided at both ends of the individual brazing sheets 150, the semi-weld supplements 112a and 112b are manufactured so as to have a tubular shape by performing joint and brazing welding together. In this case, the in / out pipes 30 and 40 having little width w of the non-clad region or low flux usage are completed.

Here, the width (w) of the non-clad region is a key issue for maintaining high quality such as high rigidity and high pressure resistance as a condenser or condenser product for automobiles, and the width (w) of the non-clad region is a reference value (for example, 2 mm). If larger, the material 36 corresponding to the sacrificial anode material during brazing is melted and melted at a brazing processing temperature lower than that of the core 35, and the other parts of the material to be coalesced (eg header tanks or joint flanges) or other. This is because it may not be completely fused with the aluminum alloy or weld failure may occur, and thus the amount of flux used may be increased, and uniform production of a welded product may not be possible.

Referring to FIG. 2C, these individual brazing sheets 150 continuously close each other the semi-weld fillers 112a and 112b corresponding to both ends of the individual brazing sheets 150 while maintaining a vee angle. It is supplied to the high frequency induction heating welding machine side of the pipe manufacturing apparatus.

The impeller 161 of the high frequency induction heating welding apparatus is inserted into the inner diameters of the in / out pipes 30 and 40, and the induction heating coil 160 is spaced apart from the outer circumference of the in / out pipes 30 and 40. Is placed.

Then, the high-frequency induction heating welding apparatus performs the welding within the range of 400 kW to 600 kW, the brittle is relatively good, and the weld quality of the present invention to provide a solid durability and the in / out pipe 30 of the present invention. , 40).

The welded in / out pipes 30 and 40 are then passed through a pair of pressure rolls and then subjected to post-treatment (such as welded surface spraying and finishing surface treatment), followed by nearly complete hollow pipe cross sections. The production is completed to have a shape.

Hereinafter, the brazing between the in pipe 30 and the joint flange 10, the in pipe 30 and the header tank 20, based on the in pipe 30 having the same type as the out pipe 40 of the present invention. We will explain the fusion or bonding relationship.

As shown in FIG. 3A, a small amount of flux is applied to the side of the joint flange 10 in the connecting hole 19 without the thread 11.

Thereafter, one end 31 of the in / out pipe including the out pipe or the in pipe 30 is inserted into the connection hole 19 based on the side on which the flux is applied.

Referring to the phosphorus pipe 30, the side with the thread 11 is where the other pipe member (not shown) to supply the refrigerant toward the phosphorus pipe 30 in the future is fastened. A stopper is formed between the side with the thread 11 and the side without the thread.

The height of the stopping jaw protrudes to the inner diameter of the in pipe 30 or the out pipe.

Due to this reason, when one end 31 of the in / out pipe including the out pipe or the in pipe 30 is brazed as follows, a part of the material 36 of the one end 31 is outside the stop jaw. As a result, it may flow into the inner circumferential surface of the stop jaw or the thread 11, and may be fixed, thereby preventing the fastening of other pipe members, thereby causing a brazing product defect.

In order to prevent this, in the present invention, the inner corner of one end 31 of the in / out pipe including the out pipe or the in pipe 30 is pressed against the outside by a predetermined expansion tool 70 to prevent the flow of the material. It is preferable that the groove 39 is formed.

As shown in FIG. 3B, as described above, the material 36 of the one end portion 31 inserted into surface contact with the inner circumferential surface of the connection hole 19 is lower than the core material 35 or the joint flange 10. It has a melting temperature.

Therefore, the material 36 of the portion inserted into the connection hole 19 in one end 31 of the in / out pipe is a sacrificial anode material that is melted by the brazing processing temperature transmitted through the brazing process, and thus, when brazing, The entire inner circumferential surface (c) of the connecting hole (19) except for the thread (11) is uniformly and firmly fused at the insertion start portion (c1) and the end portion (c2).

In addition, the workpiece flow prevention groove 39 is retained by the material 36 slightly flowing out during brazing, so that the defect of the brazing product on the side with the thread 11 on the outside of the stop jaw does not occur.

In particular, since the material 36 of the in / out pipe is manufactured to minimize the width w of the non-clad region as described above, there are no welding defects, a uniform welding area, and a solid high quality. The product is finished.

Such brazing is performed equally or equally in the fusion between the header end 20 and the other end 32 of the in / out pipe including the in pipe 30 or the out pipe, as shown in FIG. 4A.

That is, as shown in Figure 4a, a small amount of flux is also applied to the entry and exit hole 29 of the header tank 20.

Thereafter, the other end 32 of the in / out pipe including the out pipe or the in pipe 30 is inserted into the flux-applied entrance and exit 29.

Then, using a predetermined expansion tool (not shown), the end 32a of the other end 32 of the in / out pipe is preferably expanded like a dotted line.

This expansion increases the brazing efficiency and keeps the preassembly from shaking during pre-assembly storage and transport.

In addition, the other end 32 of the in / out pipe has an integral flange 34 in its body to provide the present invention with greater clamping force.

In the case of applying the present invention, the integral flange 34 may be formed by the same shape and formation method on one end of the above-described out / out pipe (not shown).

This integral flange 34 also has a core 35 and a workpiece 36.

The integral flange 34 may be formed by corrugating the other end 32 of the in / out pipe, or may be formed by coalescing another ring member by fusion.

As shown in FIG. 4B, as described above, the material 36 of the other end 32 inserted into surface contact with the inner circumferential surface of the access hole 29 may be the core material 35 or the header tank 20 core material 25. Has a melting temperature lower than).

Therefore, a portion of the other end 32 of the in / out pipe including the in pipe 30 or the out pipe is inserted into the entrance hole 29; Integral flange 34, bottom flank 36; Each of the peripheral workpieces 26 of the entrance hole 29 serves as a sacrificial anode material melted by the brazing processing temperature transmitted through the brazing process, so that the entire inner circumferential surface d of the entrance hole 29 and the insertion start portion are provided. (d1) and uniformly and firmly fused at the site | part (d2) bent by expansion.

The bent part (d2) is a part that receives the welding joint force and the bending force at the same time in the welding, so that it is possible to maintain a more firm welded state, and that the part 36 of the workpiece 36 flows into the other end 32 during brazing. Prevent it.

The flanged pipe assembly structure for automobile condenser of the present invention is pointed out in the conventional manual welding as the in / out pipe which minimizes or eliminates the width of the non-clad area at the welded area is brazed between the joint flange and the header tank. In addition to solving the problems, the increase in the weld area formed throughout the insertion site, and the increase in the clamping force according to the increase in the welding area, it is possible to produce a high-quality automotive condenser product with high pressure resistance test pressure.

In addition, the flange pipe assembly structure for automobile condenser of the present invention can reduce the manufacturing cost by welding the corresponding components by brazing method in almost all parts, and uses the in / out pipe without the width of the non-clad area. As a result, it is possible to minimize the amount of flux used during the brazing process and to maintain the precise and reliable welding quality uniformly.

In addition, the flange pipe assembly structure for an automobile condenser of the present invention has the advantage that it can be formed at one end or the other end of the in / out pipe having an integral flange to provide a more robust welding fastening force.

In addition, the flange pipe assembly structure for an automobile condenser of the present invention is formed in the inner corner of the one end of each of the in / out pipe has a flow prevention groove is formed, there is an advantage that can prevent the defects of the brazing product in advance.

Claims (7)

A material of one kind of aluminum alloy selected from the clad aluminum alloy group including aluminum alloy numbers AL4343, AL4045, AL4N43, and AL4N45; In the flange pipe assembly structure for automobile condenser including the core material which is one kind of aluminum alloy selected from clad aluminum alloy group including aluminum alloy number AL3003, AL3N03, AL3N33, AL3005, AL3N43, AL6951, An in / out pipe in which the material is laminated and laminated on one or both surfaces of the core material; A joint flange in which one end of each of the in / out pipes is fused and fixed through brazing; And a header tank in which the other end of each of the in / out pipes is fusion-fixed through brazing. The method of claim 1, The material of the part inserted into the connection hole of the joint flange among one end of each of the in / out pipes is a sacrificial anode material melted by the brazing processing temperature transmitted through the brazing process, and the entire inner circumferential surface of the connection hole except for the thread. And a flanged pipe assembly structure for an automobile condenser, characterized in that it is fused at the insertion and end portions. The method of claim 1, Flange pipe assembly structure for a car condenser, characterized in that the workpiece flow prevention groove is formed in the inner corner of one end of each of the in / out pipe. The method of claim 1, A portion of the other end of each of the in / out pipes inserted into an entry hole of the header tank and an integral flange bottom face material; Each of the peripheral materials of the entrance hole is a sacrificial anode material which is melted by the brazing processing temperature transmitted through the brazing process, and is uniformly and steadily fused in the entire inner circumferential surface of the entrance hole, the insertion start part and the end part. Flange pipe assembly structure for condenser. The method of claim 1, And an end of the other end of the other end of each of the in / out pipes is expanded. The method of claim 1, The in / out pipe is flanged pipe assembly structure for a car condenser, characterized in that the non-clad area is minimized by using the basic brazing sheet. The method of claim 6, The basic brazing sheet includes the material having a thickness ratio of 10%; The core member having a thickness ratio of 90%; And a plurality of welding supplementary portions formed between the material and the core so as to have a thickness relatively thicker than the thickness of the substrate, the plurality of welding supplements being in the width direction of the basic brazing sheet. Flange pipe assembly structure for a car condenser, characterized in that arranged at equal intervals.

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