US-12618621-B2 - Pipe connection assembly of heat exchanger

US12618621B2US 12618621 B2US12618621 B2US 12618621B2US-12618621-B2

Abstract

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

Inventors

Duck-Ho Lee
Neung Kwon
Ho Chang Sim
Jong Du Lee

Assignees

HANON SYSTEMS

Dates

Publication Date: 20260505
Application Date: 20210215
Priority Date: 20200219

Claims (8)

1 . A pipe connection assembly of a heat exchanger connecting a header tank and a pipe of the heat exchanger to each other, 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; and a welding ring disposed at one end of the manifold so that the manifold and the pipe are fixedly coupled to each other, wherein the welding ring is disposed on one end surface of the manifold, wherein a space is formed between an inner surface of one end of the manifold and an outer surface of the inserted pipe, such that the welding ring is accommodated, wherein one end of the manifold includes a first body and a second body connected to one end of the first body and having an inner diameter greater than that of the first body, wherein the second body includes an extension member with an inner diameter of a 1-1-th radius, and a protrusion part with an inner diameter of a 2-2-th radius, formed by being hollowed out and projecting from the extension member, wherein the 2-2-th radius is smaller than the 1-1-th radius, wherein a portion of the welding ring is located to seat on the protrusion part, and wherein an inner diameter of the extension member is formed to be smaller than an outer diameter of the welding ring, such that another portion of the welding ring is located on the expansion member.
2 . The pipe connection assembly of claim 1 , wherein the second body has an inner diameter that becomes narrower toward the first body.
3 . The pipe connection assembly of claim 1 , wherein a portion of the pipe is depressed inward so that a clearance between an inner surface of the second body and the outer surface of the pipe increases.
4 . The pipe connection assembly of claim 1 , wherein the number of protrusion parts is plural, and the plurality of protrusion parts are disposed to be spaced apart from each other along an inner circumferential surface of the second body.
5 . The pipe connection assembly of claim 1 , wherein the welding ring has a projection part protruding outward and disposed on an outer surface thereof.
6 . The pipe connection assembly of claim 5 , wherein an outer diameter of the projection part is formed to be greater than an inner diameter of one end side of the manifold, such that the welding ring is disposed on one end surface of the manifold.
7 . The pipe connection assembly of claim 5 , wherein the number of projection parts is plural, and the plurality of projection parts are disposed to be spaced apart from each other along an outer circumferential surface of the welding ring.
8 . A heat exchanger comprising: a pair of header tanks disposed to be spaced apart from each other; a core part including a plurality of tubes having both ends coupled to the pair of header tanks, respectively, and disposed to be spaced apart from each other in both side directions, and a plurality of fins interposed between the plurality of tubes; and the pipe connection assembly of claim 1 coupled to one or more of the header tanks among the pair of header tanks, wherein the heat exchange medium flowing inside the header tank is introduced or discharged through the pipe connection assembly.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a national phase under 35 U.S.C. § 371 of International Application No. PCT/KR2021/001912 filed on Feb. 15, 2021, which claims benefit of priority from Korean Patent Application Nos. 10-2021-0016430 filed on Feb. 5, 2021 and 10-2020-0020208 filed on Feb. 19, 2020. The entire contents of these applications are incorporated herein by reference in their entirety. TECHNICAL FIELD The present invention relates to a pipe connection assembly of a heat exchanger, and more particularly, to an assembly connecting an inlet and an outlet formed on a header tank of a heat exchanger and a pipe to each other. BACKGROUND ART In general, heat exchangers are devices installed on specific flow paths so as to perform heat exchange in such a way that a heat exchange medium circulating inside absorbs heat from the outside or radiates heat to the outside. Such heat exchangers are variously manufactured depending on use purposes, like a condenser and an evaporator using a refrigerant as a heat exchange medium, a radiator and a heater core using a coolant as a heat exchange medium, an oil cooler using oil used in an engine, a transmission, and the like, as a heat exchange medium, or the like. In this case, the heat exchanger generally has a form in which a header tank is coupled to both ends of a plurality of tubes through which heat transfer is performed between an internal fluid and an external fluid. In addition, a manifold including an inlet and an outlet through which a heat exchange medium flows is configured in the header tank, and a pipe is fixedly coupled to the manifold, such that a heat exchange medium is introduced from another engine or a heat exchange medium of which heat transfer is performed is discharged to another engine. An evaporator, which is a type of such a heat exchanger, is disclosed in Korean Patent Laid-Open Publication No. 10-2016-0026750 (entitled “Evaporator” and hereinafter referred to as “Related Art Document 1”). Referring to FIG. 1, an evaporator 1 according to Related Art Document 1 may be configured to include a first header tank 2a, a second header tank 2b, an inlet pipe 3, an outlet pipe 4 and a core part 5. In this case, the evaporator 1 may include a function of cooling air introduced by a blower by heat exchange in a process in which a liquid heat exchange medium is changed to a gaseous state and supplying the cooled air into the interior. In addition, the heat exchange medium may be introduced into the inlet pipe 3 and discharged from the outlet pipe 4, and may flow on the first header tank 2a or the second header tank 2b partitioned into two rows by an internal partition wall. Accordingly, Related Art Document 1 has provided the evaporator 1 having a plurality of pass flows by disposing a manifold including the inlet pipe 3 and the outlet pipe 4 in any one of the first header tank 2a or the second header tank 2b. Next, referring to FIG. 2, in the related art, a welding process has been performed through a pipe connection assembly including a welding ring 7c so as to connect the manifold 7a including the inlet pipe or the outlet pipe as described above and a pipe 7b of which a flow path is connected to other components in a vehicle to each other. Here, in the welding process according to the related art, a welding ring 7c was disposed on an outer surface of the pipe 7b, and when the pipe 7b is partially inserted into the manifold 7a, the pipe 7b and the manifold 7a have been fixed to each other by applying heat to the welding ring 7c through a welding torch or the like. However, in the related art, a problem that the molten welding ring 7c overflows to the outside of the manifold 7a has occurred due to a narrow space between the outer surface of the pipe 7b and an opening of the manifold 7a. Accordingly, there was a disadvantage that the heat exchanger is contaminated due to the residual welding ring 7c disposed on the outside of the manifold 7a and the pipe 7b. Currently, in order to solve the problems as described above, technologies such as Korean Patent Laid-Open Publication No. 10-2016-0087940 (entitled “Welded Construction of Inlet and Outlet Pipes of Heat Exchanger” and hereinafter referred to as “Related Art Document 2”) have been disclosed. As illustrated in FIG. 3, in Related Art Document 2, an opening of a manifold 8a is formed to have a greater diameter than a welding ring 8c, such that a portion of the welding ring 8c is inserted into the opening of the manifold 8a. However, since a welding torch used in a welding process first heats an outer portion of the welding ring 8c, there is a problem that a portion of the welding ring 8c introduced into the opening of the manifold 8a is relatively slowly molten, such that the first molten outer portion of the welding ring 8c overflows to the outside along a distal end portion of the opening. DISCLOSURE Technical Problem An object of the present invention is to provide a pipe c