KR20110131163A - Double pipe type heat exchanger and method for manufacturing the same - Google Patents

Double pipe type heat exchanger and method for manufacturing the same Download PDF

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Publication number
KR20110131163A
KR20110131163A KR1020110120790A KR20110120790A KR20110131163A KR 20110131163 A KR20110131163 A KR 20110131163A KR 1020110120790 A KR1020110120790 A KR 1020110120790A KR 20110120790 A KR20110120790 A KR 20110120790A KR 20110131163 A KR20110131163 A KR 20110131163A
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KR
South Korea
Prior art keywords
tube
pair
circumferential surface
inner tube
outer tube
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Application number
KR1020110120790A
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Korean (ko)
Inventor
유태승
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(주)휘일
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Publication of KR20110131163A publication Critical patent/KR20110131163A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0012—Brazing heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/003—Multiple wall conduits, e.g. for leak detection

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The present invention discloses a double tube heat exchanger capable of brazing the outer tube and the inner tube in a simple structure by the shaft tube of the outer tube and a manufacturing method thereof. The present invention forms a pair of rib removing sections by removing a plurality of ribs at both ends of the outer tube formed along the longitudinal direction of the plurality of ribs on the inner circumferential surface, and constraining each of the pair of rib removing sections, respectively, at both ends of the outer tube. A pair of small diameter portions are formed in the groove. A pair of through holes is formed at a position spaced inwardly from the small diameter portion, and the inner tube is inserted into the outer tube so that both ends of the inner tube are exposed out of the outer tube. The inner circumferential surface of the pair of small diameter portions and the outer circumferential surface of the inner tube are joined by brazing. According to the present invention, since the outer tube and the inner tube can be brazed in a simple structure by the shaft tube of the outer tube, the manufacturing process can be simplified, the production cost can be greatly reduced, and the productivity can be improved. In addition, since the inner circumferential surface of the small diameter portion and the outer circumferential surface of the inner tube are joined so that airtightness is maintained by brazing, poor bonding can be prevented and reliability can be improved.

Description

DOUBLE PIPE TYPE HEAT EXCHANGER AND METHOD FOR MANUFACTURING THE SAME

The present invention relates to a double tube heat exchanger, and more particularly, to a double tube heat exchanger having a simple structure having an inner tube coupled by brazing and the outer tube is connected to both ends and a manufacturing method thereof.

Heat exchangers are devices that transfer heat from a high temperature fluid to a low temperature fluid through a heat transfer wall, and are used in heaters, coolers, evaporators and condensers. Heat exchangers are available in a variety of ways, including multi-tube, double pipe, fin tube type, coil tube type, spiral type, and plate type. It is known.

The double tube heat exchanger is configured such that an inner pipe is inserted into a concentric circle in an outer pipe. Fluid for heat exchange is supplied to each of the passage and the inner tube between the outer tube and the inner tube. The double tube heat exchanger is relatively simple in structure, inexpensive, and can be constructed by connecting the same dimensions in series or in parallel to increase the heat transfer area.

A double tube heat exchanger of US Pat. No. 5,740,857 discloses a technique in which a waste liquid transmission pipe is concentrically inserted into a reservoir pipe. Coupling is coupled to each of both ends of the delivery and reservoir tubes.

A double tube heat exchanger of US Pat. No. 6,098,704 discloses a technique in which an outer tube and an inner tube are integrally formed. The inner tube is formed longer than the outer tube, and the distal end of the inner tube is exposed outside the outer tube. The header is coupled to the outer peripheral surface of the outer tube and the inner tube adjacent to the distal end of the outer tube. A connecting pipe is coupled to the header to communicate with the passage between the outer and inner tubes.

However, the conventional double tube heat exchanger as described above is required to combine separate couplings or headers at both ends of the outer tube and the inner tube, which leads to a complicated structure and manufacturing process, resulting in an increase in production cost and a decrease in productivity. In particular, when the coupling or the header is joined by brazing, the outer tube and the coupling and the inner tube and the coupling are brazed. Therefore, the machining precision of the coupling can be reduced to reduce the defect of the brazing, there is a problem that the machining cost of the coupling occurs a lot. In addition, there is a problem in that there is a high probability that a defect of the brazing joint occurs because there are many parts to be brazed.

The present invention is to solve various problems of the conventional double tube heat exchanger as described above. An object of the present invention is to provide a double tube heat exchanger and a method for manufacturing the same, which can simplify the structure and the manufacturing process, reduce the production cost, and improve the productivity.

Another object of the present invention is to provide a double tube heat exchanger and a method for manufacturing the same, which can prevent a poor connection by the shaft tube and brazing of the outer tube.

According to one aspect of the present invention, a method of manufacturing a new double tube heat exchanger is provided. A method of manufacturing a double tube heat exchanger according to the present invention includes: forming a pair of rib removing sections by removing a plurality of ribs at both ends of an outer tube having a plurality of ribs formed in a longitudinal direction on an inner circumferential surface thereof; Conduiting each of the pair of rib removal sections to form a pair of small diameter portions at each of both ends of the outer tube; Forming a pair of through holes at positions spaced in a predetermined distance from the pair of small diameter portions; Inserting the inner tube into the outer tube such that both ends of the inner tube are exposed out of the outer tube; Coupling the inner circumferential surface of the pair of small diameter parts with the outer circumferential surface of the inner tube by brazing.

The double tube heat exchanger according to another aspect of the present invention includes a large diameter portion, a pair of small diameter portions formed at both ends of the large diameter portion by axial condensation, a plurality of ribs extending along the longitudinal direction on the inner circumferential surface of the large diameter portion, and formed on the large diameter portion. An outer tube including a pair of through holes; An inner tube inserted into the outer tube so as to be exposed out of the pair of small diameter portions, the inner peripheral surface of the pair of small diameter portions and the outer peripheral surface of the inner tube are joined by brazing.

The double tube heat exchanger according to the present invention and the manufacturing method thereof can be brazed to the outer tube and the inner tube by a simple structure by the shaft tube of the outer tube, the manufacturing process is simplified to greatly reduce the production cost, improve the productivity Can be. In addition, since the inner circumferential surface of the small diameter portion and the outer circumferential surface of the inner tube are joined so that airtightness is maintained by brazing, poor bonding can be prevented and reliability can be improved. In particular, the conventional double tube heat exchanger has to braze the coupling with respect to four places of the outer tube and the inner tube, but the double tube heat exchanger according to the present invention is brazed in two places of the small diameter portion and the inner tube of the outer tube. The probability of bad will be greatly reduced.

1 is a cross-sectional view showing the configuration of a double tube heat exchanger according to the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.
3 is a cross-sectional view taken along the line III-III of FIG. 1.
Figure 4 is a perspective view of the outer tube cut out in the double tube heat exchanger according to the present invention.
5 is a perspective view showing the outer tube and the inner tube in the double tube heat exchanger according to the present invention.
6 is a cross-sectional view illustrating the outer tube of FIG. 5.
7 is a cross-sectional view illustrating a state in which the ribs of the outer tube are removed from the double tube heat exchanger according to the present invention.
8 is a cross-sectional view illustrating the shaft tube of the outer tube in the double tube heat exchanger according to the present invention.
9 is a cross-sectional view illustrating a state in which the outer tube, the inner tube and the first and second connecting tubes are temporarily assembled in the double tube heat exchanger according to the present invention.
10 is a front view showing an example of the configuration in which the double tube heat exchanger according to the present invention is bent.
11 is a front view illustrating a state in which a knurling is formed in an outer tube in a double tube heat exchanger according to the present invention.
12 is a partial cross-sectional view for explaining the rolling of the knurling in the double tube heat exchanger according to the present invention.
It is a front view which shows the structure by which the groove | channel is formed in the outer side pipe | tube in a double tube heat exchanger.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of a double tube heat exchanger and a method of manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

First, referring to FIGS. 1 to 4, the double tube heat exchanger 10 according to the present invention includes an outer tube 20. The outer tube 20 is composed of a hollow pipe having a passage 22, a first end portion 24 and a second end portion 26, and a metal material having excellent thermal conductivity, for example, an aluminum alloy, It is produced linearly by extrusion of copper alloy.

A plurality of ribs (28) are formed along the longitudinal direction on the inner circumferential surface of the outer tube (20). A pair of rib removal sections 30a and 30b are formed in which ribs 28 disposed at the first and second end portions 24 and 26 of the outer tube 20 are removed. That is, the rib removal sections 30a and 30b are formed by removing the ribs 28 to a predetermined length from the sock end of the outer tube 20. The rib removing sections 30a and 30b are formed of a pair of small diameter portions 32a and 32b whose diameters are reduced by the shaft tube. The large diameter portion 32c is disposed between the small diameter portions 32a and 32b, and each of the large diameter portion 32c and the small diameter portions 32a and 32b is formed by each of the pair of tapered portions 32d and 32e. It is connected.

A pair of through holes 34a and 34b are formed on the outer circumferential surface of the outer tube 20 so as to communicate with the passage 22. 1 and 4, the through holes 34a and 34b are formed in opposite directions, but the through holes 34a and 34b may be formed in the same direction.

The double tube heat exchanger 10 according to the present invention includes an inner tube 40 inserted into the outer tube 20. The inner tube 40 is composed of a hollow tube having a passage 42, a first end portion 44, and a second end portion 46, and is manufactured linearly by extrusion of a metal material. The inner tube 40 is formed longer than the outer tube 20, and the first and second end portions 44 and 46 of the inner tube 40 are exposed out of the outer tube 20. The outer circumferential surface of the inner tube 40 is in contact with the inner circumferential surfaces of the ribs 28 and the small diameter portions 32a and 32b. The inner circumferential surface of the small diameter portions 32a and 32b is brazed to the outer circumferential surface of the inner tube 40 to be coupled to maintain airtightness.

The first connecting pipe 50 and the second connecting pipe 52 are connected to each of the through holes 34a and 34b so as to communicate with the passage 22. The first connecting pipe 50 may be an inlet pipe for introducing the fluid, and the second connecting pipe 52 may be an outlet pipe for discharging the fluid. Heating medium is generally supplied to the passage 42 of the inner tube 40 to prevent the risk of leakage. Cooling media, such as cooling water, is supplied to the passage 22 between the outer tube 20 and the inner tube 40. The heat medium and the cooling medium exchange heat with the inner tube 40 interposed therebetween.

The double tube heat exchanger according to the present invention having such a configuration and a manufacturing method thereof will now be described.

5 and 6, the outer tube 20 and the inner tube 40 are prepared by molding by extrusion. The plurality of ribs 28 are formed along the longitudinal direction on the inner circumferential surface of the outer tube 20 by extrusion. In FIG. 5, four ribs 28 are illustrated at equal intervals, but this is merely an example, and the number and positions of the ribs 28 may be appropriately changed as necessary.

As shown in FIG. 7, a pair of ribs 28 are removed by removing the first and second end portions 24 and 26 of the outer tube 20 from the inner circumferential surface of the outer tube 20 adjacent thereto. The rib removal sections 30a and 30b are formed. The ribs 28 remove by cutting a length from the first and second distal ends 24, 26 toward the center of the passage 22. The ribs 28 can be simply removed by the lathe cutting.

As shown in FIG. 8, after the rib removal sections 30a and 30b are formed by removing the ribs 28, the first and second end portions 24 having the rib removal sections 30a and 30b are formed. , And a pair of small diameter portions 32a and 32b are formed by axially aligning the outer circumferential surface of the adjacent outer tube 20. The shaft pipe of the outer tube 20 can be implemented by a swaging machine. After the shaft pipe of the outer tube 20 is completed, a pair of through holes 34a and 34b are formed on the outer circumferential surface of the outer tube 20 adjacent to each of the small diameter portions 32a and 32b to communicate with the passage 22. do. In the present embodiment, the through holes 34a and 34b may be formed to avoid the ribs 28 on the outer circumferential surface of the outer tube 20 in which the ribs 28 are formed. The through holes 34a and 34b may be formed by punching of a press, piercing machine, or drilling of a drilling machine.

1 and 9, the inner tube 40 is inserted into the passage 22 of the outer tube 20 to be preassembled. The first and second distal ends 44 and 46 of the inner tube 40 are inserted into the outer tube 20 so as to be exposed out of the outer tube 20. The outer circumferential surface of the inner tube 40 is supported by the inner circumferential surface of the ribs 28. At this time, as shown in FIG. 1, a brazing filler metal 60 is filled for brazing between the inner circumferential surface of the small diameter portions 32a and 32b and the outer circumferential surface of the inner tube 40.

In addition, the first and second connecting pipes 50 and 52 are inserted into the through holes 34a and 34b of the outer pipe 20 to be preassembled. The brazing filler metal 62 is filled for brazing between the inner circumferential surfaces of the through holes 34a and 34b and the outer circumferential surfaces of the first and second connecting pipes 50 and 52, respectively. In the present embodiment, the first and second connecting pipes 50 and 52 may be replaced with the inlet and outlet pipes of the fluid. In this case, the inlet pipe and the outlet pipe may be coupled to the through holes 34a and 34b through a separate process.

When the temporary assembly of the outer tube 20, the inner tube 40, the first connector 50 and the second connector 52 is completed, the temporary assembly is put into a brazing furnace to perform brazing. . Brazing can be carried out while conveying the assembled assembly in a brazing furnace by a conveyor. Once the brazing is complete, remove the temporary assembly from the brazing furnace and allow it to cool.

Finally, as shown in FIG. 10, the double tube heat exchanger 10 according to the present invention may be bent in a predetermined form for the configuration of a heater, a cooler, an evaporator, a condenser, and the like. At this time, the large diameter portion 32c and the inner tube 40 of the outer tube 20 are integrally bent. Bending of the double tube heat exchanger 10 may be performed by a bending machine.

As described above, the double tube heat exchanger 10 according to the present invention is manufactured by brazing the inner tube 40 by removing a portion of the ribs 28 and condensing the tube, thereby simplifying the structure and simplifying the manufacturing process, thereby reducing the production cost. Can improve productivity. In addition, since the inner circumferential surfaces of the small-diameter portions 32a and 32b are brazed to the outer circumferential surface of the inner tube 40, the coupling is maintained well, and thus a poor bonding can be prevented and reliability can be improved.

Referring to FIG. 11, the double tube heat exchanger 10 according to the present invention further includes a knurling 70 formed on the outer circumferential surface of the inner tube 40 to increase the surface area. The knurling 70 is formed on the outer circumferential surface of the inner tube 40 to be in contact with the ribs 28 before inserting the inner tube 40 into the outer tube 20. 11, the knurling 70 is formed of diamond knurling, but the knurling 70 may be formed of a straight knurling. The knurling 70 may be formed by form rolling or lathe turning using a knurling tool 72 on a lathe. It is preferable to carry out knurling 70 by rolling.

Referring to FIG. 12, in the double tube heat exchanger 10 according to the present invention, the knurling 70 is rolled flat by a rolling mill. The knurling 70 has a plurality of peaks 72a and a plurality of valleys 72b. The peaks 72a are flattened by rolling. The surface area of the inner tube 40 is increased by the interface of the deformed acids 72a. When the surface area of the inner tube 40 is increased, the thermal conductive area is widened. In particular, when the knurling 70 is formed by rolling, the thickness change of the inner tube 40 is minimized by the knurling 70 being rolled flat to maintain rigidity.

Referring to FIG. 13, the double tube heat exchanger 10 according to the present invention further has grooves 80 formed on the outer circumferential surface of the inner tube 40 in contact with the plurality of ribs 28 to increase the surface area. It is. The groove 80 is formed on the outer circumferential surface of the inner tube 40 so as to be in contact with the ribs 28 before inserting the inner tube 40 into the outer tube 20. Processing of the groove 80 can be formed by turning of the lathe. In FIG. 13, the groove 80 is helically formed on the outer circumferential surface of the inner tube 40, but this is merely illustrative, and the groove 80 is linear along the axial direction or the radial direction of the inner tube 40. It may be formed or formed in a serration. The formation of the grooves 80 increases the heat conduction area of the inner tube 40.

The embodiments described above are merely illustrative of the preferred embodiments of the present invention, the scope of the present invention is not limited to the described embodiments, those skilled in the art within the spirit and claims of the present invention It will be understood that various changes, modifications, or substitutions may be made thereto, and such embodiments are to be understood as being within the scope of the present invention.

10: heat exchanger 20: outer tube
22: passage 28: rib
30a, 30b: Rib removal section 32a, 32b: Small diameter part
32c: Large diameter part 32d, 32e: taper part
34a, 34b: through hole 40: inner tube
42: passage 50: first connector
52: second connector 60, 62: brazing filler metal
70: knurled 80: groove

Claims (12)

Forming a pair of rib removing sections by removing the plurality of ribs at both ends of the outer tube in which a plurality of ribs are formed along an inner circumferential surface thereof;
Conduiting each of the pair of rib removing sections to form a pair of small diameter portions at each of both ends of the outer tube;
Forming a pair of through holes at positions spaced a predetermined distance inward from the pair of small diameter portions;
Inserting the inner tube into the outer tube such that both ends of the inner tube are exposed out of the outer tube;
The method of manufacturing a double tube heat exchanger comprising the step of coupling the inner peripheral surface of the pair of small diameter portion and the outer peripheral surface of the inner tube by brazing. The method of claim 1,
After inserting the inner tube into the outer tube, coupling the first connecting tube and the second connecting tube which can be coupled by the brazing to the pair of through holes. Way. The method according to claim 1 or 2,
And the pair of through-holes are formed in the outer circumferential surface of the outer tube adjacent to the pair of small diameter portions. The method according to claim 1 or 2,
After the step of coupling, the method of manufacturing a double tube heat exchanger further comprising the step of bending the outer tube to the desired shape. The method according to claim 1 or 2,
And forming a knurling to increase a surface area on an outer circumferential surface of the inner tube in contact with the plurality of ribs before inserting the inner tube into the outer tube. The method of claim 5,
The method of manufacturing a double tube heat exchanger further comprising the step of rolling the knurling. The method according to claim 1 or 2,
And forming a plurality of grooves on the outer circumferential surface of the inner tube in contact with the plurality of ribs before inserting the inner tube into the outer tube to increase a surface area. An outer side including a large diameter portion, a pair of small diameter portions formed by axially connecting both ends of the large diameter portion, a plurality of ribs extending in a longitudinal direction on an inner circumferential surface of the large diameter portion, and a pair of through holes formed in the large diameter portion Tube;
An inner tube inserted into the outer tube so as to be exposed out of the pair of small diameter portions,
A double tube heat exchanger having an inner circumferential surface of the pair of small diameter portions and an outer circumferential surface of the inner tube connected by brazing. The method of claim 7, wherein
And the large diameter portion and the inner tube are integrally bent. The method according to claim 8 or 9,
And a knurling is further formed on an outer circumferential surface of the inner tube in contact with the plurality of ribs to increase the surface area. The method of claim 10,
The knurling is a flat-rolled double tube heat exchanger. The method according to claim 8 or 9,
And a groove is formed on an outer circumferential surface of the inner tube in contact with the plurality of ribs to increase a surface area.
KR1020110120790A 2011-10-19 2011-11-18 Double pipe type heat exchanger and method for manufacturing the same KR20110131163A (en)

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KR20110107119 2011-10-19
KR1020110107119 2011-10-19

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101287605B1 (en) * 2012-05-08 2013-07-19 (주)휘일 Double pipe type heat exchanger
KR101326723B1 (en) * 2012-05-08 2013-11-08 (주)휘일 Double pipe heat exchanger with spiral lib and method manufacturing the same
WO2013168981A1 (en) * 2012-05-08 2013-11-14 (주)휘일 Double pipe heat exchanger with helical rib, and method and apparatus for manufacturing helical ribbed pipe
KR20160006319A (en) * 2014-07-08 2016-01-19 유재경 Channel Shaped Tube Having Dual Fluid Paths for Exchanging Heat

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101287605B1 (en) * 2012-05-08 2013-07-19 (주)휘일 Double pipe type heat exchanger
KR101326723B1 (en) * 2012-05-08 2013-11-08 (주)휘일 Double pipe heat exchanger with spiral lib and method manufacturing the same
WO2013168981A1 (en) * 2012-05-08 2013-11-14 (주)휘일 Double pipe heat exchanger with helical rib, and method and apparatus for manufacturing helical ribbed pipe
KR20160006319A (en) * 2014-07-08 2016-01-19 유재경 Channel Shaped Tube Having Dual Fluid Paths for Exchanging Heat

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