Pipe connection assembly for heat exchangers

Abstract

The present invention relates to a pipe connection assembly of a heat exchanger for connecting a header tank and a pipe of a heat exchanger, in which a device for preventing a welding ring for fixing the manifold and the pipe from entering into a hollow portion at one end of the manifold before welding is provided, and a space is formed between an inner surface of the one end of the manifold and an outer surface of the pipe, thereby preventing the melted welding ring from flowing out.

Description

Technical Field

[0001] The present invention relates to a pipe connecting assembly for a heat exchanger, and more particularly, to an assembly for connecting an inlet and an outlet formed on a water header tank of a heat exchanger and a pipe to each other. Background Art

[0002] Generally, a heat exchanger is a device installed along a specific flow path to perform heat exchange in such a way that a heat exchange medium circulates within it, either absorbing heat from the outside or dissipating it. Such heat exchangers are manufactured differently depending on their intended use, with examples including condensers and evaporators using refrigerant as the heat exchange medium, radiators and heater cores using coolant as the heat exchange medium, and oil coolers using oil used in engines, transmissions, and the like.

[0003] In this case, the heat exchanger typically has a form in which a header tank is connected to both ends of a plurality of tubes, through which heat is transferred between the internal and external fluids. Furthermore, a manifold including an inlet and an outlet for a heat exchange medium is constructed in the header tank, and the pipes are fixedly connected to the manifold, allowing the heat exchange medium to be introduced from another engine or discharged to another engine after the heat exchange medium has been transferred. An evaporator, which is one type of such a heat exchanger, is disclosed in Korean Patent Publication No. 10-2016-0026750 (entitled "Evaporator," hereinafter referred to as "Related Art Document 1").

[0004] Reference Figure 1 According to the related art document 1, the evaporator 1 can be constructed to include a first header tank 2a, a second header tank 2b, an inlet duct 3, an outlet duct 4, and a core 5. In this case, the evaporator 1 can include a function of cooling the air introduced by the blower through heat exchange during the process of the liquid heat exchange medium becoming gaseous, and supplying the cooled air to the interior. In addition, the heat exchange medium can be introduced into the inlet duct 3 and discharged from the outlet duct 4, and can flow on the first header tank 2a or the second header tank 2b divided into two rows by the internal partition wall. Therefore, the related art document 1 has provided an evaporator 1 with multiple flow paths by providing a manifold including the inlet duct 3 and the outlet duct 4 in either the first header tank 2a or the second header tank 2b.

[0005] Next, refer to Figure 2In the related art, a welding process has been performed using a pipe connection assembly including a welding ring 7c to connect a manifold 7a, which includes an inlet pipe or outlet pipe as described above, to a pipe 7b, whose flow path connects to other components in the vehicle. In this welding process according to the related art, the welding ring 7c is provided on the outer surface of the pipe 7b. When the pipe 7b is partially inserted into the manifold 7a, heat is applied to the welding ring 7c using a welding torch or the like, thereby securing the pipe 7b and the manifold 7a to each other. However, in the related art, due to the narrow space between the outer surface of the pipe 7b and the opening of the manifold 7a, the melted welding ring 7c has been found to overflow onto the outside of the manifold 7a. Consequently, there is a disadvantage in that the heat exchanger is contaminated by residual welding ring 7c provided on the exterior of the manifold 7a and the pipe 7b.

[0006] Currently, in order to solve the above problems, technologies such as Korean Patent Publication No. 10-2016-0087940 (titled “Welded Construction of Inlet and Outlet Pipes of Heat Exchanger”, hereinafter referred to as “Related Art Document 2”) have been disclosed. Figure 3 As shown in Related Art Document 2, the opening of the manifold 8a is formed to have a larger diameter than the welding ring 8c, so that a portion of the welding ring 8c is inserted into the opening of the manifold 8a. However, since the welding torch used during welding first heats the outer portion of the welding ring 8c, there is a problem that the portion of the welding ring 8c introduced into the opening of the manifold 8a melts relatively slowly, causing the first melted outer portion of the welding ring 8c to overflow to the outside along the distal end portion of the opening. Summary of the Invention

[0007] Technical issues

[0008] An object of the present invention is to provide a pipe connection assembly for a heat exchanger, wherein a space between the inner surface of one end of a manifold and the outer surface of a pipe can be ensured to accommodate a melted welding ring, and the welding ring can be exposed to the outside during welding.

[0009] Technical Solution

[0010] In a general aspect, a pipe connection assembly of a heat exchanger that connects a header tank and a pipe of the heat exchanger to each other includes: a manifold having one end connected to the pipe and the other end connected to an inner portion of the header tank so that a heat exchange medium flows; and a welding ring provided at one end of the manifold so that the manifold and the pipe are fixedly coupled to each other, wherein the welding ring is provided on one end surface of the manifold and a space is formed between the inner surface of the one end of the manifold and the outer surface of the inserted pipe so as to accommodate the melted welding ring.

[0011] In addition, the manifold may have a protrusion protruding toward the hollow inner portion and provided on the inner surface of the one end.

[0012] In addition, one end of the manifold may include a first body and a second body connected to one end of the first body and having an inner diameter larger than that of the first body, and the protrusion may be provided on the second body.

[0013] Additionally, the welding ring may be configured to rest on the protrusion.

[0014] In addition, in the manifold, an inner diameter of the second body may be formed to be smaller than an outer diameter of the welding ring so that a portion of the welding ring is seated on the second body.

[0015] In addition, in the manifold, a length difference between an outer diameter of the welding ring and an inner diameter of the second body may be formed to be smaller than a gap between an inner surface of the welding ring and an outer surface of the pipe.

[0016] In addition, the inner diameter of the second body may be formed to be larger than the outer diameter of the welding ring so that the thickness of the inner and outer sides of the welding ring is smaller than the gap between the inner surface of the second body and the outer surface of the pipe.

[0017] In addition, the second body may have an inner diameter that becomes narrower toward the first body.

[0018] In addition, a portion of the duct may be recessed inwardly so that a gap between an inner surface of the second body and an outer surface of the duct increases.

[0019] In addition, the protrusion may be a plurality of protrusions, and the plurality of protrusions may be provided to be spaced apart from each other along the inner circumferential surface of the second body.

[0020] In addition, the welding ring may have a protrusion protruding outward and provided on an outer surface of the welding ring.

[0021] In addition, the outer diameter of the protrusion may be formed to be larger than the inner diameter of one end side of the manifold so that the welding ring is provided on the one end surface of the manifold.

[0022] In addition, the protrusion may be a plurality of protrusions, and the plurality of protrusions may be provided to be spaced apart from each other along an outer circumferential surface of the welding ring.

[0023] In another general aspect, a heat exchanger includes: a pair of water collecting tanks, the pair of water collecting tanks being arranged to be spaced apart from each other; a core, the core including a plurality of tubes and a plurality of fins, both ends of the plurality of tubes being respectively connected to the pair of water collecting tanks, and the plurality of tubes being arranged to be spaced apart from each other in two side directions, and the plurality of fins being inserted between the plurality of tubes; and a pipe connecting assembly, the pipe connecting assembly being connected to one or more of the water collecting tanks among the pair of water collecting tanks, wherein the heat exchange medium flowing inside the water collecting tanks is introduced into or discharged through the pipe connecting assembly.

[0024] Beneficial effects

[0025] In the heat exchanger pipe connection assembly according to the present invention having the above-described configuration, a cup-shaped space is formed at the end of the manifold to accommodate the melted weld ring and prevent the weld ring from being introduced into the space before the welding process. Therefore, the present invention not only has the advantage of preventing welding byproducts of the weld ring from flowing downwardly to the outside of the manifold, but also has the advantage of resolving problems such as welding defects when performing welding using a welding torch.

[0026] In addition, according to the setting of the diameter (or radius) relationship between the components of the pipe connection assembly of the heat exchanger, the present invention can allow the melted weld ring to be appropriately introduced into the space when heat is applied to the weld ring from the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a perspective view of an evaporator according to the related art.

[0028] Figure 2 and Figure 3 is a cross-sectional view of a pipe connection assembly according to the related art.

[0029] Figure 4 is a perspective view of a heat exchanger according to a first embodiment of the present invention.

[0030] Figure 5 1 is an exploded perspective view of a pipe connection assembly according to a first embodiment of the present invention.

[0031] Figure 6 1 and 2 are perspective views and enlarged views of a main portion of a manifold according to a first embodiment of the present invention.

[0032] Figure 7a and Figure 7b 1 is a diagram illustrating an assembling process of a pipe connection assembly according to a first embodiment of the present invention.

[0033] Figure 8a 、 Figure 8b and Figure 9 is a sectional view of a pipe connection assembly according to a first embodiment of the present invention.

[0034] Figure 10 is a side sectional view of a pipe connection assembly according to a second embodiment of the present invention.

[0035] Figure 11a and Figure 11b 1 is a diagram illustrating an assembling process of a pipe connection assembly according to a third embodiment of the present invention.

[0036] Figure 12 is a planar sectional view of a pipe connection assembly according to a third embodiment of the present invention.

[0037] Figure 13 is an exploded perspective view of a pipe connection assembly according to a fourth embodiment of the present invention.

[0038] Figure 14 is a planar sectional view of a pipe connection assembly according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0039] Hereinafter, a pipe connection assembly of a heat exchanger having the above-described configuration according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0040] <First embodiment>

[0041] Figure 4 and Figure 5 A pipe connection assembly of a heat exchanger according to a first embodiment of the present invention is shown, wherein: Figure 4 This is a three-dimensional diagram of the heat exchanger. Figure 5 It is an exploded perspective view of the pipe connection assembly.

[0042] Reference Figure 4 , the heat exchanger according to the present invention may include a manifold connection portion 10, a water collection tank 20 and a core portion 30. In this case, the manifold connection portion 10 may have a in ) to the heat exchange medium in the manifold connection and discharged from the manifold connection (F out) of the heat exchange medium and can be fixedly coupled to the header tank 20. In addition, the header tanks 20 can be formed as a pair and arranged spaced apart from each other in the height direction, and both ends of the tube 31 of the core 30 in the height direction can be respectively coupled to the pair of header tanks 20. In addition, the manifold connection part 10 may include an inlet and an outlet through which the heat exchange medium is introduced (F in ), through which the heat exchange medium is discharged (F out ), and the inlet and outlet can be constructed in various structures, for example, a structure in which both the inlet and the outlet are connected to one header tank 20 or are respectively connected to the pair of header tanks 20, or a structure in which multiple inlets and outlets are constructed and connected to the header tank 20. In addition, the core 30 may include a plurality of tubes 31 arranged to be spaced apart from each other in the length direction, and also include fins 32 interposed between the plurality of tubes 31. Here, since the heat exchanger according to the present invention can be formed as an evaporator, the heat exchange medium can flow inside the manifold connection part 10, the header tank 20, and the tubes 31, and the air introduced by the blower can flow to the fins 32. Therefore, the air can be cooled while the flowing heat exchange medium evaporates and the air can be supplied to the interior of the vehicle. In addition, although not shown, a partition wall that partitions the interior into two or more rows, a baffle that realizes multiple channel flows, and the like may also be included in the header tank 20 according to the present invention.

[0043] The heat exchange medium will be described in more detail through the structure between the above-mentioned components. When the heat exchange medium is introduced into the inlet of the manifold connection 10, it can be distributed to the plurality of tubes 31 through the header tank 20 and exchange heat with the fluid flowing outside the tubes 31. Furthermore, the heat exchange medium can flow along the path formed by the header tank 20 and the tubes 31, and the heat exchange medium that has undergone heat exchange can be discharged through the outlet of the manifold connection 10. Here, the inlet and outlet of the manifold connection 10 can be connected to pipelines, so as to be configured so that the heat exchange medium can be introduced from or discharged to another engine.

[0044] Reference Figure 5The manifold connection portion 10 may include one or more manifolds 100, and the manifold 100 may be formed as an inlet 110 or an outlet 120. Furthermore, a welding ring 300 may be provided between the manifold 100 and the pipe 200 so that the manifold 100 and the pipe 200 can be fixedly coupled to each other. In this case, the welding ring 300 can be melted through a welding process to fixedly couple the manifold 100 and the pipe 200. Hereinafter, the pipe connection assembly according to the present invention to be described may include the structure between the manifold 100 and the pipe 200 described above, and the end of the manifold 100 connected to the pipe 200 will be defined as one end, and the direction in which the manifold 100 is connected to the water header tank 20 will be defined as the other end. In this case, the manifold 100 may be connected to the water header tank 20 via a separate housing of the manifold connection portion 10 as shown, or may be installed to be directly connected to the water header tank 20, although this is not shown, and the illustrated structure is merely an example for more clearly describing the present invention, and the present invention is not limited thereto.

[0045] Figure 6 、 Figures 7a and 7b A pipe connection assembly of a heat exchanger according to a first embodiment of the present invention is shown, wherein Figure 6 This is a three-dimensional and enlarged view of the main parts of the manifold. Figure 7a and Figure 7b 2 is a diagram showing an assembly process of a pipe connection assembly.

[0046] Reference Figure 6 , the manifold 100 according to the present invention may be opened on one side, and hereinafter, in order to more clearly describe the present invention, the side on which the manifold 100 is opened will be defined as the upper side D 11 , the direction opposite to the upper side will be defined as the lower side D 12 , typically in the vertical direction D1. In addition, the manifold 100 may have a main body that extends so that its inner portion is hollow based on the front-back (D2) and left-right (D3) planes perpendicular to the vertical direction D1, and may extend in a shape such as a circular shape or a polygonal shape depending on the form of the manifold 100. In this case, based on the front-back, left-right planes, the direction toward the center point of the hollow portion will be defined as the inside, and the direction opposite to the inside will be defined as the outside. In addition, as the main body with a predetermined thickness extends, the diameter of the outer surface of the main body will be defined as the outer diameter, the diameter of the inner surface of the main body will be defined as the inner diameter, the distance from the center of the hollow portion to the outer surface will be referred to as the outer radius, and the distance from the center of the hollow portion to the inner surface will be referred to as the inner radius. In addition, taking into account the case where the front-back, left-right planes of the main body have an irregular or polygonal shape, the outer diameter and the inner diameter will be defined as twice the outer radius and twice the inner radius, respectively.

[0047] The manifold 100 may include a first body 101 and a second body 102, and a hollow portion 100a extending vertically therethrough may be hollow within the manifold 100. In this case, the first body 101 may be a vertically extending body, and the second body 102 may be connected to the upper end of the first body 101 and extend upward. Here, the inner diameter of the second body 102 may be formed to be larger than the inner diameter of the first body 101, and the second body 102 may have an inner diameter formed to a 1-1 radius M0. In addition, the second body 102 may include an extension member 102a having a 1-1 radius M0 and a protrusion 102b having a shape protruding from the extension member 102a toward the hollow portion 100a. In this case, the inner end of the protrusion 102b may have a 1-2 radius M1, which may be formed to be smaller than the 1-1 radius M0. Here, the number of the protrusions 102b may be plural, the plurality of protrusions 102b may be formed and arranged to be spaced apart from each other along the inner circumferential surface of the second body 102, and some of the plurality of protrusions 102b may be arranged in directions symmetrical to each other relative to the center of the hollow portion 100a.

[0048] Refer to it together Figure 7a and Figure 7b During welding using the pipe connection assembly according to the present invention, the weld ring 300 can be positioned on the upper end surface of the manifold 100 before welding, and the pipe 200 can be introduced into the hollow portion 100a of the manifold 100 with the weld ring 300 positioned. In this case, as described above, a space can be formed in the second body 102 of the manifold 100 due to the extension member 102a being positioned at the uppermost end and the inner surface being spaced apart from the outer surface of the pipe 200. Here, when the weld ring 300 melts, it can be introduced into this space. Furthermore, the protrusion 102b of the second body 102 prevents the weld ring 300 from being introduced into this space before welding, thereby supporting the weld ring 300 to be exposed to the outside.

[0049] Figure 8a 、 Figure 8b and Figure 9 A pipe connection assembly of a heat exchanger according to a first embodiment of the present invention is shown, wherein Figure 8a 、 Figure 8b and Figure 9 is a side cross-sectional view of a pipe connection assembly. In this case, Figure 8a and Figure 9 is a side cross-sectional view taken along an extension member at one end of the manifold, Figure 8b is a side cross-sectional view taken along the protrusion at one end of the manifold.

[0050] Reference Figure 8a and Figure 8b , the pipe 200 may be formed so that the diameter 2Y of its outer surface has a second radius Y, and the welding ring 300 may be formed so that the diameter 2R of its outer surface and the diameter 2R0 of its inner surface have a third radius R and a 3-1 radius R0, respectively. In this case, as described above, the inner surfaces of the extension member 102a and the protrusion 102b of the second body 102 may be formed so as to have a 1-1 radius M0 and a 1-2 radius M1, respectively, and the respective radii may have lengths formed according to the following Relationship 1.

[0051] [Equation 1]

[0052] O <Y≤R0<M1<M0<R

[0053] That is, since the 1-1 radius M0 and the 1-2 radius M1 of the second body 102 are formed smaller than the third radius R of the outer surface of the welding ring 300, a portion of the lower surface of the welding ring 300 can be seated on the extension member 102a of the second body 102, while the remaining portion of the lower surface of the welding ring 300 can be seated on the protrusion 102b of the second body 102. Furthermore, since the inner surface of the second body 102 and the outer surface of the pipe 200 are spaced apart by a predetermined distance, a void space is formed. Therefore, when the welding ring 300 melts, it can be drawn into this void space. In this case, the inner diameter of the first body 101 can be formed to correspond to or differ from the outer diameter of the pipe 200. When the inner diameter of the first body 101 corresponds to the outer diameter of the pipe 200, the first body 101 and the pipe 200 can be coupled to each other to form a tight joint.

[0054] Alternatively, the above-described second body 102 , pipe 200 , and welding ring 300 may be formed to have lengths according to the following relation (2).

[0055] [Equation 2]

[0056] O <Y≤R0<M1<R<M0

[0057] This means that the inner diameter of the extension member 102a of the second body 102 is formed to be larger than the outer diameter of the welding ring 300, and the inner diameter of the protrusion 102b of the second body 102 is formed to be smaller than the outer diameter of the welding ring 300, and the welding ring 300 can be prevented from being introduced into the empty space through the protrusion 102b before welding.

[0058] Reference Figure 9Considering assemblability, a gap (R0-Y) may be formed between the inner diameter of the weld ring 300 and the outer diameter of the pipe 200. Furthermore, as described above, the inner diameter of the extension member 102a may be formed to be larger than the outer diameter of the weld ring 300, and the length difference (R-M0) between the inner diameter of the extension member 102a and the outer diameter of the weld ring 300 may be formed to be the same as or different from the gap (R0-Y). As an example, the gap and the length difference (R-M0) may be formed by the following relational equation (3).

[0059] [Equation 3]

[0060] R-M0<R0-Y

[0061] In the case where the gap and the length difference (R-M0) are formed as in the relationship (3), when the welding ring 300 is biased toward one side, the welding ring 300 can be introduced into the space between the inner surface of the second body 102 and the outer surface of the pipe 200, but the insertion of the welding ring 300 can be restricted by the protrusion 102b of the second body 102.

[0062] <Second embodiment>

[0063] Figure 10 FIG. 2 shows a pipe connection assembly of a heat exchanger according to a second embodiment of the present invention. Figure 10 is a side cross-sectional view of a pipe connection assembly.

[0064] Reference Figure 10 , the pipe 200 of the pipe connection assembly according to the present invention can be formed so that the outer surface of its lower end is recessed inward. In this case, the pipe 200 may include: a first pipe body 210, which extends in the vertical direction so that its outer diameter has a second radius Y; and a second pipe body 220, which is connected to the lower end of the first pipe body 210 and has an outer diameter formed to have a 2-1 radius Y1, as described above. In this case, the 2-1 radius Y1 is formed to have a length smaller than the second radius Y, and therefore, the second pipe body 220 can be configured into an inwardly recessed shape. In this case, the term "inward" can refer to the hollow inward direction of the pipe 200, and the second radius Y and the 2-1 radius Y1 are radii based on the center of the hollow inner portion of the pipe 200.

[0065] In addition, the pipe 200 may further include a third pipe body 230 connected to the lower end of the second pipe body 220. In this case, the third pipe body 230 may have an outer diameter formed as a 2-2nd radius Y2, and the 2-2nd radius Y2 may be formed to be larger than the 2-1st radius Y1. In addition, the 2-2nd radius Y2 may be formed to have the same length as or different from the second radius Y.

[0066] In addition, the manifold 100 may further include a third body 103 extending downward from the first body 101. In this case, the inner diameter of the third body 103 is formed to be smaller than the inner diameter of the first body 101 and the outer diameter of the lower end of the pipe 200, so the insertion depth of the pipe 200 can be limited.

[0067] <Third embodiment>

[0068] Figure 11a 、 Figure 11b and Figure 12 A pipe connection assembly of a heat exchanger according to a third embodiment of the present invention is shown, wherein Figure 11a and Figure 11b is a diagram showing the assembly process of the pipe connection assembly, Figure 12 It is a plan cross-sectional view of the pipe connection assembly.

[0069] Reference Figure 11a and Figure 11b , the welding ring 300 may be provided at a point where the manifold 100 and the pipe 200 contact each other. In more detail, when one end of the manifold 100 is connected to the pipe 200, as Figure 6 As shown, and when the other end of the manifold 100 is connected to the water collecting tank as described above, the welding ring 300 can be provided on one end side of the manifold 100, as shown in FIG. Figure 11a In addition, a hollow portion may be formed in one end of the manifold 100 and each of the welding ring 300, and as shown in FIG. Figure 11b As shown, pipe 200 can be inserted into the hollow portion. Next, in the present invention, when pipe 200 is inserted into the hollow portion of manifold 100, welding ring 300 is melted using a welding torch or the like, allowing manifold 100 and pipe 200 to be welded and connected. In this embodiment, one end of manifold 100 is positioned facing upward, and welding ring 300 can be formed to be positioned above the end of manifold 100. Furthermore, welding ring 300 can be melted while penetrating the gap between the outer surface of pipe 200 and the inner surface of manifold 100 to be accommodated. A feature of the present invention is that outwardly protruding protrusions 310 are formed on the outer surface of welding ring 300. Furthermore, protrusions 310 may be provided in one or more portions, and when provided in plurality, they may be spaced apart along the outer circumferential surface of welding ring 300.

[0070] Will refer to Figure 12The structural relationship between the manifold 100, the pipe 200, and the weld ring 300 will be described in more detail. When the manifold 100, the pipe 200, and the weld ring 300 are configured in a cylindrical or annular shape, the radius may be formed based on a constant center point O. In this case, the protrusion 310 of the weld ring 300 protrudes outward, and therefore, the 3-2 radius R1, which is the outer radius of the protrusion 310 of the weld ring 300, may be formed to be larger than the third radius R, which is the outer radius of the weld ring 300. Furthermore, at one end of the manifold 100, a first radius M, which is the outer radius, and a 1-1 radius M0, which is the inner radius, may be formed. Here, the 3-2 radius R1 is formed to be smaller than the first radius M but larger than the 1-1 radius M0, so that the protrusion 310 can be seated on one end surface of the manifold 100. Furthermore, the third radius R may be formed to have a length smaller than the 1-1 radius M0. Therefore, when the weld ring 300 melts, it is contained within the space formed by the inner surface of the second body 102 of the manifold 100 and the outer surface of the pipe 200, as described above, and is fully exposed to the outside. This prevents welding defects and prevents the melted weld ring 300 from overflowing due to unmelted weld ring 300 inside. The outer surface of the pipe 200 may also have a diameter formed as a second radius Y, which may be formed to correspond to the 3-1 radius R0, which is the inner radius of the weld ring 300. In this case, considering assemblability, the 3-1 radius R0 may be formed to be larger than the second radius Y.

[0071] <Fourth embodiment>

[0072] Figure 13 and Figure 14 A pipe connection assembly of a heat exchanger according to a fourth embodiment of the present invention is shown, wherein Figure 13 This is an exploded perspective view of the pipe connection assembly. Figure 14 It is a plan cross-sectional view of the pipe connection assembly.

[0073] Reference Figure 13 The pipe connection assembly according to the present invention further includes a connection body 400 that connects the manifold 100 and the pipe 200 to each other. In this case, a protrusion 410 protruding inwardly may be formed on the inner surface of the upper end of the connection body 400, and the welding ring 300 may be seated on one end surface of the protrusion 410 and may be disposed to surround the outer surface of the pipe 200.

[0074] Will refer to Figure 14 The structures between the corresponding components are described in more detail. Figure 14As shown, the connection body 400 includes an inwardly protruding protrusion 410. The inner sides of the connection body 400 and the protrusion 410 may have inner diameters formed as a fourth radius N and a 4-1 radius N1, respectively, based on a specific center point O. Here, the 4-1 radius N1 may be formed to be smaller than the fourth radius N. Furthermore, the welding ring 300 may have a third radius R as an outer radius and a 3-1 radius R0 as an inner radius. These third radius R and 3-1 radius R0 are formed based on the center point O. The 3-1 radius R0 may be formed to be smaller than the fourth radius N but larger than the 4-1 radius N1. Therefore, the welding ring 300 may be placed on the protrusion 410 of the connection body 400 and exposed to the outside. Furthermore, the 3-1 radius R0 is formed to be larger than the second radius Y, which is the outer radius of the pipe 200, so that the welding ring 300 can be formed to surround the pipe 200. In addition, a space is formed between the inner surface of the upper end side of the connection body 400 and the outer surface of the lower end side of the pipe 200, and when the welding ring 300 placed on the protrusion 410 is melted, the welding ring 300 can be accommodated in this space. Here, according to the present invention, a plurality of protrusions 410 can be arranged to be spaced apart from each other along the inner circumferential surface of the connection body 400, and the protruding surface of the protrusion 410 can be modified in various forms, such as a protruding surface parallel to one end surface of the connection body 400 or a form inclined relative to the one end surface of the connection body 400.

[0075] The present invention is not limited to the above-described embodiments, but can be applied to various fields. In addition, the present invention can be variously modified by those skilled in the art without departing from the gist of the present invention as claimed in the claims.

Claims

1. A pipe connection assembly for a heat exchanger, the pipe connection assembly connecting a water collecting tank and a pipe of the heat exchanger to each other, the pipe connection assembly comprising: a manifold having one end connected to the pipe and the other end connected to an inner portion of the header tank so that a heat exchange medium flows; as well as a welding ring provided at one end of the manifold so that the manifold and the pipe are fixedly coupled to each other, wherein the welding ring is provided on one end surface of the manifold, and A space is formed between the inner surface of one end of the manifold and the outer surface of the inserted pipe to accommodate the melted welding ring. wherein one end of the manifold includes a first body and a second body, the second body being connected to one end of the first body and having an inner diameter larger than that of the first body, The second body includes an extension member having an inner diameter of a 1-1 radius and a protrusion having an inner diameter of a 1-2 radius formed by being hollowed out and protruding from the extension member, wherein the 1-2 radius is smaller than the 1-1 radius. wherein a portion of the welding ring is positioned to rest on the protrusion, An inner diameter of the extension member is formed to be smaller than an outer diameter of the welding ring so that another portion of the welding ring is located on the extension member.

2. The pipe connection assembly according to claim 1, wherein: In the manifold, a length difference between an outer diameter of the welding ring and an inner diameter of the second body is formed to be smaller than a gap between an inner surface of the welding ring and an outer surface of the pipe.

3. The pipe connection assembly according to claim 1, wherein: The inner diameter of the second body is formed to be larger than the outer diameter of the welding ring so that the thickness of the inner and outer sides of the welding ring is smaller than the gap between the inner surface of the second body and the outer surface of the pipe.

4. The pipe connection assembly according to claim 1, wherein: The second body has an inner diameter that becomes narrower toward the first body.

5. The pipe connection assembly according to claim 1, wherein: A portion of the pipe is recessed inwardly, so that a gap between an inner surface of the second body and an outer surface of the pipe is increased.

6. The pipe connection assembly according to claim 1, wherein: The number of the protrusions is plural, and the plurality of protrusions are provided to be spaced apart from each other along the inner circumferential surface of the second body.

7. The pipe connection assembly according to claim 1, wherein: The welding ring has a protrusion protruding outward and provided on an outer surface of the welding ring.

8. The pipe connection assembly according to claim 7, wherein: The outer diameter of the protrusion is formed to be larger than the inner diameter of one end side of the manifold so that the welding ring is provided on the one end surface of the manifold.

9. The pipe connection assembly according to claim 7, wherein: The number of the protrusions is plural, and the plurality of protrusions are provided to be spaced apart from each other along the outer circumferential surface of the welding ring.

10. A heat exchanger, comprising: a pair of water collecting tanks, the pair of water collecting tanks being arranged to be spaced apart from each other; a core comprising a plurality of tubes and a plurality of fins, wherein both ends of the plurality of tubes are respectively coupled to the pair of water collecting tanks, the plurality of tubes are arranged to be spaced apart from each other in two lateral directions, and the plurality of fins are interposed between the plurality of tubes; as well as The pipe connection assembly of claim 1, wherein the pipe connection assembly is coupled to one or more of the water collecting tanks in the pair of water collecting tanks. The heat exchange medium flowing inside the water collecting tank is introduced into or discharged through the pipe connection assembly.

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