WO2020130657A1

WO2020130657A1 - Heat exchanger, and device and method for manufacturing same

Info

Publication number: WO2020130657A1
Application number: PCT/KR2019/018061
Authority: WO
Inventors: 구중삼; 한지훈; 김영찬
Original assignee: 한온시스템 주식회사
Priority date: 2018-12-20
Filing date: 2019-12-19
Publication date: 2020-06-25

Abstract

An embodiment provides a heat exchanger, and a device and a method for manufacturing same, the heat exchanger comprising: a pair of header tankers spaced apart from each other; multiple tubes, each of which is fixed at both ends thereof to the pair of header tanks to form a flow channel for a heat-exchanging medium; and multiple heat-radiating fins coupled to the multiple tubes, wherein each of the heat-radiating fins comprises: a plate-shaped fin body; multiple tube insertion holes which are formed in the fin body and into which the tubes are inserted, respectively; and a joining enhancement part formed to protrude from the edge of each of the tube insertion holes in the fin body. Therefore, the problem of a small area of the joining portion between the tubes and the heat-radiating fins can be solved by the joining enhancement part.

Description

Heat exchanger, its manufacturing apparatus and manufacturing method

An embodiment relates to a heat exchanger, its manufacturing apparatus and manufacturing method. In detail, the present invention relates to a heat exchanger having an increased bonding area between a tube and a radiating fin to improve heat exchange efficiency, and an apparatus and method for manufacturing the heat exchanger.

A heat exchanger, for example a radiator, can be installed in the engine room of a vehicle.

An invention related to this is Korean Patent Publication No. 10-2011-0072005 (2011.06.29., heat exchanger).

The radiator is generally made of a structure in which heat dissipation fins are coupled to a tube, and can be divided into mechanical and brazing methods according to the heat dissipation fin coupling method.

Among the radiators, a mechanical radiator is manufactured by expanding the tube while the tube is inserted into the heat dissipation fin.

Therefore, the mechanical radiator has an advantage in that it is inexpensive to manufacture compared to a conventional radiator of a brazing method, but the bonding area between the tube and the heat dissipation fin is small, so that the tube and the heat dissipation fin easily fall, thereby lowering heat dissipation performance, etc. There was a problem.

An embodiment provides a heat exchanger, an apparatus for manufacturing the same, and a manufacturing method, which improves the problem that the bonding area between the tube and the radiating fin is small.

The problems to be solved in the embodiments are not limited to the problems mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the following description.

The subject is a pair of header tanks spaced apart from each other; A plurality of tubes having both ends fixed to the pair of header tanks to form a flow path of a heat exchange medium; And a plurality of heat dissipation fins coupled to the plurality of tubes, wherein the heat dissipation fins are plate-shaped fin bodies; A plurality of tube insertion holes formed in the fin body and into which the tube is inserted; And it is achieved by a heat exchanger including a junction increasing portion formed by protruding from the edge of the tube insertion hole in the fin body.

Here, the junction increasing portion may be formed in a hollow pillar shape to surround the outer circumferential surface of the tube.

In addition, an end portion of the junction increasing portion disposed on any one of the heat dissipation fins may be disposed to be in contact with one surface of the fin body of the heat dissipation fins disposed adjacent to each other.

In addition, the tube insertion hole has a cross-sectional shape corresponding to the tube, and the tube insertion hole includes a pair of arc portions facing each other, and a pair of arc portions connecting the pair of arc portions and facing each other. , The distance between the pair of arc portions may be greater than the distance between the pair of connection portions.

Here, the connecting portion may be made of one concave curvature portion. Alternatively, the connecting portion may be formed of two concave curvature portions.

In addition, the heat dissipation fin may include a plurality of louvers formed by cutting and bending the pin body, and the louvers may include a plurality of valleys extending along an inclined surface of the louver.

In addition, the heat dissipation fin includes a plurality of louvers disposed between the tube insertion holes, and a plurality of tabs protruding from one surface of the fin body, and ends of the tabs disposed on any one of the heat dissipation fins are neighbors It may be arranged to be in contact with one surface of the fin body of the heat dissipation fins are arranged.

Here, the tab may be formed by cutting and bending the pin body.

In addition, the tab may be disposed on the pin body in a zigzag shape based on the longitudinal direction of the heat dissipation fin.

Further, the tab may be arranged on the width direction side based on one louver.

The object is to expand the tube inserted into the tube insertion hole of the heat dissipation fin; And it is achieved by a manufacturing apparatus of a heat exchanger including a heating unit for heating the expansion tube.

The object is to prepare a heat radiation fin having a tube insertion hole; Preparing a tube to be inserted into the tube insertion hole; Forming a clad layer on the tube or the heat dissipation fin; And expanding the tube through an expansion part in a state where the tube is inserted into the tube insertion hole, and the expansion part expands the tube in a state heated by a heating part to melt the clad layer and dissolve the It is achieved by a method of manufacturing a heat exchanger forming a junction increasing portion connecting the tube and the heat dissipation fin.

The heat exchanger according to the embodiment, the manufacturing apparatus and the manufacturing method thereof, can improve the problem that the bonding area between the tube and the radiating fin is small by the bonding increasing unit.

In addition, the heat exchanger according to the embodiment can improve the heat exchange efficiency of the heat exchanger by expanding the arrangement area of the louver through the arrangement of the tabs.

Various and beneficial advantages and effects of the embodiments are not limited to the above, and will be more easily understood in the course of describing the specific embodiments of the present invention.

1 is a front view showing a heat exchanger according to an embodiment,

2 is a side view showing a heat dissipation fin of a heat exchanger according to an embodiment,

3 is an enlarged perspective view showing part A of FIG. 2,

Figure 4 is an enlarged side view showing part A of Figure 2,

5 is a cross-sectional view taken along line A-A in FIG. 4,

Figure 6 is a perspective view of part B of Figure 4,

7 is a modified example of FIG. 4,

8 is another modification of FIG. 4,

9 is another modification of FIG. 4,

10 is a view showing the coupling of the tube and the heat dissipation fin of a conventional mechanical radiator,

11 is a view showing an apparatus for manufacturing a heat exchanger according to an embodiment,

12 is a view showing a combination of a heat dissipation fin and the tube of a conventional mechanical radiator using the manufacturing apparatus of the heat exchanger according to the embodiment,

13 is a view showing a coupling relationship between the heat exchange fin and the tube of the heat exchanger according to the embodiment manufactured by the manufacturing apparatus of the heat exchanger according to the embodiment,

14 is a flow chart showing a method of manufacturing a heat exchanger according to an embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical idea of the present invention is not limited to some embodiments described, but may be implemented in various different forms, and within the scope of the technical idea of the present invention, one or more of its components between embodiments may be selectively selected. It can be used by bonding and substitution.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly defined and described, can be generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as a meaning, and terms that are commonly used, such as a dictionary-defined term, may interpret the meaning in consideration of the contextual meaning of the related technology.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In the present specification, a singular form may also include a plural form unless specifically stated in the phrase, and is combined with A, B, C when described as “at least one (or more than one) of A and B, C”. It can contain one or more of all possible combinations.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used.

These terms are only for distinguishing the component from other components, and the term is not limited to the nature, order, or order of the component.

And, when a component is described as being'connected','coupled' or'connected' to another component, the component is not only directly connected to, coupled to, or connected to the other component, but also to the component It may also include a case of'connected','coupled' or'connected' due to another component between the other components.

In addition, when described as being formed or disposed in the “upper (upper) or lower (lower)” of each component, the upper (upper) or lower (lower) is one as well as when the two components are in direct contact with each other. It also includes a case in which another component described above is formed or disposed between two components. In addition, when expressed as “up (up) or down (down)”, it may include the meaning of the downward direction as well as the upward direction based on one component.

1 is a front view showing a heat exchanger according to an embodiment. In FIG. 1, in consideration of the shape and arrangement of the tube 130 and the heat dissipation fin 140, the x direction may indicate an insertion direction, and the z direction may indicate a longitudinal direction or a vertical direction.

Referring to FIG. 1, the heat exchanger according to the embodiment may include a first header tank 110, a second header tank 120, a plurality of tubes 130, and heat dissipation fins 140. Here, the first header tank 110 and the second header tank 120 may be disposed spaced apart from each other.

The first header tank 110 may be formed with a heat exchange medium, for example, at least one inlet (not shown) through which the refrigerant passing through the evaporator of the vehicle air conditioner flows, and the second header tank 120 may exchange heat. At least one outlet (not shown) through which the medium is discharged may be formed.

Both ends of the tube 130 may be fixed by being coupled to the first header tank 110 and the second header tank 120, respectively.

In addition, the tube 130 may form a flow path of the heat exchange medium. That is, the heat exchange medium in the first header tank 110 may move to the second header tank 120 through the tube 130.

The plurality of tubes 130 may be arranged to be spaced apart from each other in the z direction. As shown in Figure 1, a plurality of tubes 130 are disposed between the first header tank 110 and the second header tank 120, the first header tank 110 and the second header The tank 120 may be disposed to be spaced apart from each other in the longitudinal direction. Here, the heat dissipation fin 140 may be coupled to the tube 130.

2 is a side view showing a heat dissipation fin of a heat exchanger according to an embodiment, FIG. 3 is an enlarged perspective view showing part A of FIG. 2, FIG. 4 is an enlarged side view showing part A of FIG. 2, and FIG. 5 is FIG. It is a sectional view in AA. In FIG. 2, the y-direction may indicate a width direction.

2 to 5, the heat dissipation fin 140 may include a fin body 141, a plurality of tube insertion holes 143, and a joint augmentation part 145. In addition, the heat dissipation fin 140 may further include a plurality of louvers 147 and/or tabs 149.

The pin body 141 may be formed in a plate shape, that is, a flat plate shape.

The tube insertion hole 143 may be formed to penetrate one surface and the other surface of the pin body 141.

In addition, the tube 130 may be inserted into the tube insertion hole 143.

The tube insertion hole 143 may be formed in a shape corresponding to the tube 130. For example, the tube insertion hole 143 may have a shape corresponding to the cross-sectional shape of the tube 130. Therefore, the following description of the shape of the tube insertion hole 143 may be applied as it is to the cross-sectional shape of the tube 130 by applying the same or some changes.

The tube insertion hole 143 may include a pair of arc portions 143a facing each other, and a pair of arc portions 143b connecting the pair of arc portions 143a and disposed to face each other.

The space W1 between the pair of arc portions 143a may be greater than the space W2 between the pair of connecting portions 143b. In particular, the connection portion 143b may be formed of one concave curvature portion to increase the contact area between the tube 130 and the heat dissipation fin 140. Here, the interval W1 between the arc portions 143a may be referred to as a first interval. In addition, the gap W2 between the connecting portions 143b may be referred to as a second gap.

In addition, the curvature portion of the connecting portion 143b may be formed in an arc shape. Then, in consideration of the arrangement of the louver 147, the curvature portion may be arranged such that the shortest distance is formed at the center side of the connection portion 143b. Accordingly, the distance W2 between the connecting portions 143b may be the shortest distance from the central side.

The plurality of tube insertion holes 143 may be disposed spaced apart from each other in the longitudinal direction of the pin body 141. Accordingly, each of the plurality of tubes 130 may be inserted into each of the plurality of tube insertion holes 143.

The junction increasing portion 145 may be formed to protrude from the tube insertion hole 143. Here, the junction increasing portion 145 may be formed to protrude in the insertion direction of the tube 130.

3 to 5, the junction augmentation part 145 may be formed by bending the edge of the tube insertion hole 143 in the fin body 141. Accordingly, the junction increasing portion 145 may be formed along the edge of the tube insertion hole 143.

Therefore, the bonding augmentation part 145 may have a shape protruding from one surface of the pin body 141 so as to surround the tube insertion hole 143. Here, the junction increasing portion 145 may be a hollow pillar shape, but is not limited thereto.

Referring to FIG. 5, since the junction augmentation part 145 may be formed by bending at the pin body 141, it may be disposed to face the tube 130 inserted into the tube insertion hole 143. Therefore, the contact area between the tube 130 and the heat dissipation fin 140 may be increased by the junction increasing unit 145.

Meanwhile, a cladding layer (not shown) may be formed on the inner surface of the junction increasing portion 145. The clad layer may include lead (Pb), but is not limited thereto, and may include other materials as long as it can be used as a brazing material for the tube 130 and the heat dissipation fin 140.

2 to 4, a plurality of louvers 147 may be disposed between the plurality of tube insertion holes 143. Here, the louver 147 may be referred to as a louver pin.

The louver 147 may be formed by cutting and bending the pin body 141. In addition, the louver 147 may be disposed to be inclined with respect to the pin body 141. In addition, a plurality of the louvers 147 may be disposed on the pin body 141 to be spaced apart from each other so that air can flow smoothly between one surface and the other surface of the pin body 141. Accordingly, since a passage through which air can move may be formed between the louvers 147 disposed along the width direction, the louver 147 may improve heat exchange efficiency.

6 is a perspective view of part B of FIG. 4, and may show another example of the arrangement of the louver 147.

Referring to FIG. 6, the louver 147 may include a plurality of valleys 147a extending along an inclined surface of the louver 147. For example, the louver 147 may be formed in a cross-sectional shape of a tooth or a wavy shape in the width direction. Accordingly, the louver 147 may increase the contact area with the air.

And, as shown in Figure 6, in consideration of the flow of air flowing toward the louver 147, a plurality of louvers 147 may be arranged in different directions. For example, the plurality of louvers 147 may be disposed on the pin body 141 in a'V' shape.

A plurality of tabs 149 may be formed to protrude from one surface of the pin body 141.

As the tab 149 is formed to protrude based on the pin body 141, the tab 149 may maintain a distance between the heat dissipation fins 140. Here, the protruding height of the tab 149 may be greater than the protruding height of the junction increasing portion 145. At this time, the tab 149 and the junction increasing portion 145 may be formed to protrude from the pin body 141 in the same direction.

For example, an end of the tab 149 disposed in any one of the heat dissipation fins 140 may be disposed and supported in contact with one surface of the fin body 141 of the heat dissipation fin 140 disposed adjacent to the insertion direction. Therefore, the distance between the heat dissipation fins 140 can be maintained. Accordingly, FPDM (Fins Per DeciMeter, number of pins per 10 cm) may be maintained by the tab 149, but as a result, the installation space of the louver 147 may be reduced.

In addition, the tab 149 may be formed by cutting and bending an area of the pin body 141. Accordingly, a hole may be formed in the pin body 141 to penetrate one surface and the other surface, and air may move through the hole.

7 is a modified example of FIG. 4, and may show another embodiment of the heat dissipation fin 140.

Referring to FIG. 7, the tube insertion hole 143 includes a pair of arc portions 143a facing each other, and a pair of arc portions 143a connecting the pair of arc portions 143a and facing each other. The connecting portion 143b may be formed of two concave curvature portions to further increase the contact area between the tube 130 and the heat dissipation fin 140.

Here, the curvature portion may be formed in an arc shape, and the two curvature portions may be disposed on the connection portion 143b so that the longest distance is formed at the center side of the connection portion 143b. Accordingly, the distance W2 between the connecting portions 143b may be the longest distance from the central side.

8 is a modified example of FIG. 4, and may show another embodiment of the heat dissipation fin 140.

Referring to FIG. 8, the heat dissipation fin 140 may be formed such that one tab 149 is disposed on the width direction side of the louver 147. As illustrated in FIG. 8, one tab 149 may be disposed on the width direction side based on one louver 147.

Here, the tab 149 may be arranged in a zigzag shape based on the longitudinal direction of the heat dissipation fin 140. Accordingly, the plurality of tabs 149 having a zigzag arrangement can support the heat dissipation fin 140 while maintaining the distance between the heat dissipation fins 140 in a balanced manner.

When comparing the heat dissipation fin 140 shown in FIG. 4 and the heat dissipation fin 140 shown in FIG. 8, the heat dissipation fin 140 shown in FIG. 8 is more tabbed than the heat dissipation fin 140 shown in FIG. 4 149) is small in number. Accordingly, since the louver 147 may be disposed in the region of the pin body 141 on which the tab 149 is formed, the heat exchange efficiency can be improved by increasing the installation space of the louver 147.

9 is a modified example of FIG. 4, and may show another embodiment of the heat dissipation fin 140.

As the junction augmentation part 145 is formed to protrude based on the pin body 141, the junction augmentation part 145 may function to maintain a distance between the heat dissipation fins 140.

For example, the end portion of the junction increasing portion 145 disposed in any one of the heat dissipation fins 140 may be in contact with and supported by one surface of the fin body 141 of the heat dissipation fins 140 disposed adjacent to the insertion direction. Therefore, the distance between the heat dissipation fins 140 can be maintained. However, the tube 130 can be expanded by heat after being combined in a manner that is inserted into the tube insertion hole 143 of the heat dissipation fin 140, so that the heat dissipation fin ( 140) may be determined.

Accordingly, the junction increase unit 145 may increase the installation space of the louver 147 while maintaining the FPDM (Fins Per DeciMeter, the number of pins per 10 cm).

Referring to FIG. 9, the heat dissipation fin 140 may include the fin body 141, a plurality of tube insertion holes 143, a joint augmentation part 145, and a plurality of louvers 147. have.

When comparing the heat dissipation fin 140 shown in FIG. 4 and the heat dissipation fin 140 shown in FIG. 9, the heat dissipation fin 140 shown in FIG. 9 does not include the tab 149 and the junction augmentation part ( The difference is that the end of 145 supports the pin body 141. Accordingly, since the louver 147 may be arranged in the region of the pin body 141 on which the tab 149 is formed, by increasing the installation space of the louver 147, the heat exchange efficiency of the heat dissipation fin 140 is increased. Improve it.

10 is a view showing the coupling of the tube and the heat dissipation fin of a conventional mechanical radiator.

Referring to FIG. 10, the tube 10 and the radiating fin 20 of the conventional radiator may be mechanically coupled by a conventional dilator 30 having an outer diameter larger than the inner diameter of the tube 10. For example, as the inner diameter and the outer diameter of the tube 10 increase while the tube 30 is inserted into the tube 10, the tube expansion operation may be performed. Accordingly, the outer peripheral surface of the tube 10 comes into contact with the heat dissipation fin 20.

However, this mechanical coupling has a problem that the coupling strength is low and the coupling is released by impact. In addition, since the mechanical coupling induces simple contact, there is a problem in that heat exchange efficiency is poor.

11 is a view showing an apparatus for manufacturing a heat exchanger according to an embodiment, and FIG. 12 is a view showing a combination of a heat radiating fin and a tube of a conventional mechanical radiator using the apparatus for manufacturing a heat exchanger according to an embodiment. Is a view showing a coupling relationship between a heat exchange fin and a tube of a heat exchanger according to an embodiment manufactured by an apparatus for manufacturing a heat exchanger according to an embodiment.

Referring to FIG. 11, an apparatus for manufacturing a heat exchanger according to an embodiment may include an expansion portion 210 and a heating portion 220. Here, the manufacturing apparatus of the heat exchanger according to the embodiment may be referred to as an expansion device.

The expansion tube 210 may have an outer diameter larger than the inner diameter of the tube 130. Therefore, in the process in which the expansion portion 210 is inserted into the tube 130, the expansion and expansion of the inner diameter and the outer diameter of the tube 130 may be performed. In addition, since the expansion operation of the tube 130 is performed while the tube 130 is inserted into the tube insertion hole 143 of the heat dissipation fin 140, the tube 130 is attached to the heat dissipation fin 140 by the expansion operation. It can be fixed securely.

At this time, since the heat dissipation fin 140 of the heat exchanger according to the embodiment includes the junction augmentation part 145, during the expansion operation using the augmentation part 210, surface contact by the junction augmentation part 145 is performed. can do. Accordingly, the coupling force and heat exchange efficiency of the heat dissipation fin 140 and the tube 130 of the heat exchanger according to the embodiment may be increased.

The heating unit 220 may heat the expansion tube 210. Therefore, the expansion pipe 210 expands the tube 130 and simultaneously melts the clad layer (not shown) formed on the tube 130 or the heat radiation fin 140 to connect the tube 130 and the heat radiation fin 140. The junction increasing portion 230 can be formed. Here, the heating unit 220 may include an electric heater disposed in the expansion tube 210, but is not limited thereto, and the heating unit 220 may include various types of known heaters. At this time, the junction enhancement portion 230 formed by melting the clad layer may be referred to as a second junction enhancement portion. Accordingly, the junction increasing portion 145 of the heat dissipation fin 140 disposed in the heat exchanger according to the embodiment may be referred to as a first junction increasing portion.

As shown in FIG. 12, even if the conventional tube 10 and the heat dissipation fin 20 are used, the manufacturing apparatus of the heat exchanger according to the embodiment uses the heating part 220 to heat the tube 10 or the heat dissipation fin ( 20) By forming a junction increasing portion 230 connecting the tube 10 and the heat radiation fin 20 by melting the clad layer (not shown) formed on the tube, the bonding force and heat exchange efficiency of the tube 10 and the heat radiation fin 20 Can increase.

In addition, as shown in FIG. 13, even during expansion operation using the tube 130 and the heat dissipation fin 140 of the heat exchanger according to the embodiment, the heat exchanger according to the embodiment increases the junction of the heat dissipation fin 140 (145) ), the bonding strength of the tube 130 and the heat dissipation fin 140 and the heat exchange efficiency can be further increased through the junction increase unit 230 formed by melting the clad layer.

Therefore, the heat exchanger according to the embodiment includes a structural joint increase portion such as a joint increase portion 145 of the heat dissipation fin 140 and a chemical joint increase portion formed by a melting phenomenon, such as a joint increase portion 230 formed by melting the clad layer. can do.

14 is a flowchart of a method of manufacturing a heat exchanger according to an embodiment.

Referring to Figure 14, the method of manufacturing a heat exchanger according to an embodiment is prepared by the step of preparing a heat radiation fin (S100), preparing a tube (S110), forming a clad layer (S120), and expanding portions It may include the step of expanding the tube and forming a junction augmentation (S130).

The method of manufacturing the heat exchanger according to the embodiment may be performed using the manufacturing apparatus of FIG. 11, and as a result, the heat exchangers of FIGS. 1 to 9 may be manufactured.

First, a plurality of heat radiation fins 140 having a tube insertion hole 143 may be prepared (S100).

Next, a tube 130 inserted into the tube insertion hole 143 may be prepared (S110).

Next, a cladding layer may be formed on the tube 130 or the heat dissipation fin 140 (S120). Here, the clad layer may be formed on the tube 130 or the heat dissipation fin 140, but is not limited thereto.

Next, the tube 130 can be expanded by the expansion tube 210 in a state where it is inserted into the tube insertion hole 143 (S130). At this time, the expansion tube 210 may melt the cladding layer while expanding the tube 130 in a state heated by the heating unit 220. Accordingly, as illustrated in FIGS. 12 and 13, the clad layer in a molten state may form a junction enhancement portion 230 connecting the tube 130 and the heat dissipation fin 140.

The preferred embodiments of the present invention have been described above, but those skilled in the art can add, change, delete or add components within the scope of the present invention. By this, the present invention can be variously modified and changed, and it will be said that it is also included within the scope of the present invention.

110: first header tank, 120: second header tank, 130: tube, 140: heat dissipation fin, 141: pin body, 143: tube insertion hole, 143a: circular arc, 143b: connecting portion, 145: joint increase, 147: Louver, 147a: bone, 149: tap, 210: dilator, 220: heating, 230: joint augmentation

Claims

A pair of header tanks spaced apart from each other;

A plurality of tubes having both ends fixed to the pair of header tanks to form a flow path of a heat exchange medium; And

It includes a plurality of heat dissipation fins coupled to the plurality of tubes,

The heat dissipation fin,

A plate-shaped pin body;

A plurality of tube insertion holes formed in the fin body and into which the tube is inserted; And

A heat exchanger including a junction increasing portion protruding from the edge of the tube insertion hole in the fin body.
According to claim 1,

The junction increasing portion is a heat exchanger formed in a hollow pillar shape to surround the outer circumferential surface of the tube.
According to claim 1,

The heat exchanger is disposed at one end of the heat-radiating fin, and the end portion of the junction increasing portion is disposed in contact with one surface of the fin body of the heat-dissipating fin.
According to claim 1,

The tube insertion hole has a cross-sectional shape corresponding to the tube,

The tube insertion hole includes a pair of arc portions facing each other, and a pair of connecting portions connecting the pair of arc portions and facing each other,

The heat exchanger between the pair of circular arc portions is larger than the gap between the pair of connecting portions.
According to claim 4,

The connection portion is a heat exchanger formed of one concave curvature portion.
According to claim 4,

The connection portion is a heat exchanger formed of two concave curvature portions.
According to claim 1,

The heat dissipation fin,

The pin body includes a plurality of louvers formed by cutting and bending,

The louver is a heat exchanger including a plurality of valleys extending along the inclined surface of the louver.
According to claim 1,

The heat dissipation fin,

A plurality of louvers disposed between the tube insertion holes, and

It includes a plurality of tabs disposed to protrude from one surface of the pin body,

An end of the tab disposed on any one of the heat dissipation fins is a heat exchanger disposed to be in contact with one surface of the fin body of the heat dissipation fins adjacent to each other.
The method of claim 8,

The tab is a heat exchanger formed by cutting and bending the pin body.
The method of claim 9,

The tab is a heat exchanger disposed on the fin body in a zigzag shape based on the longitudinal direction of the heat dissipation fin.
The method of claim 10,

The tab is a heat exchanger disposed on the width direction side based on one louver.
An expanding portion for expanding a tube inserted into the tube insertion hole of the heat dissipation fin; And

Manufacturing apparatus of a heat exchanger including a heating unit for heating the expansion tube.
Preparing a heat radiation fin having a tube insertion hole;

Preparing a tube to be inserted into the tube insertion hole;

Forming a clad layer on the tube or the heat dissipation fin; And

Comprising the step of expanding the tube through the expansion portion in the state of inserting the tube into the tube insertion hole,

The expansion tube is a method of manufacturing a heat exchanger by expanding the tube in a state heated by a heating unit to melt the clad layer and form a junction enhancement unit connecting the tube and the heat radiation fin.