EP1840495B1 - Double pipe heat exchanger and method of manufacturing the same - Google Patents
Double pipe heat exchanger and method of manufacturing the same Download PDFInfo
- Publication number
- EP1840495B1 EP1840495B1 EP05704232A EP05704232A EP1840495B1 EP 1840495 B1 EP1840495 B1 EP 1840495B1 EP 05704232 A EP05704232 A EP 05704232A EP 05704232 A EP05704232 A EP 05704232A EP 1840495 B1 EP1840495 B1 EP 1840495B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pipe
- heat exchanger
- inner pipe
- outer pipe
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000012530 fluid Substances 0.000 claims description 23
- 239000000498 cooling water Substances 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 9
- 241000219793 Trifolium Species 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Images
Classifications
-
- 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
- F28F1/08—Tubular elements crimped or corrugated in longitudinal section
-
- 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
- F28D7/106—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 consisting of two coaxial conduits or modules of two coaxial conduits
-
- 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
- F28F1/02—Tubular elements of cross-section which is non-circular
- F28F1/06—Tubular elements of cross-section which is non-circular crimped or corrugated in cross-section
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4935—Heat exchanger or boiler making
- Y10T29/49361—Tube inside tube
Definitions
- the present invention relates to a double pipe heat exchanger that is: used as an EGR cooler, an oil cooler, or the like; and bent along the piping route of a vehicle.
- An EGR cooler is interposed in the middle of the pipe for the exhaust gas of an engine and cools the exhaust gas with cooling water.
- An example thereof is "a double pipe heat exchanger" disclosed in Japanese Unexamined Patent Publication No. 2000-161871 .
- the heat exchanger has a double pipe structure comprising an inner pipe and an outer pipe, and radiator fins are integrally bent and formed at an intermediate portion in the axial direction of the inner pipe. That is, a large number of protrusions are formed in the radial directions from the center in a cross section at the intermediate portion of the inner pipe.
- JP2002-013882 describes a double-page heat exchanger having radial protrusions in cross section and a continuous structure in the axial direction and according to the preamble of claim 1.
- a conventional EGR cooler is interposed into a linear part located in the middle of the exhaust gas pipe for an engine.
- the positioning of the EGR cooler is inflexible, the number of parts increases, and the production cost as a whole has been obliged to increase.
- an object of the present invention is to provide: a double pipe heat exchanger that has a simple structure and can be easily bent along a piping route; and a method for producing the double pipe heat exchanger.
- the present invention according to Claim 1 is a double pipe heat exchanger wherein:
- the present invention according to Claim 2 is a double pipe heat exchanger according to Claim 1, wherein only the center portions of the end edges of the balloon-shaped bulges (3) on the outside in the radial directions touch the inner surface of the outer pipe (2).
- the present invention according to Claim 3 is a double pipe heat exchanger according to Claim 1 or 2, wherein:
- the present invention according to Claim 4 is a double pipe heat exchanger according to Claim 1 or 2, wherein:
- the present invention according to Claim 5 is a double pipe heat exchanger according to any one of Claims 1 to 4, wherein, in an axial cross-section of the inner pipe (1) :
- the present invention according to Claim 6 is a method for producing a double pipe heat exchanger according to any one of Claims 1 to 5, comprising the processes of:
- a double pipe heat exchanger and a production method thereof according to the present invention are configured as stated above and exhibit the following effects.
- a double pipe heat exchanger is: formed by bending the inner pipe 1 and the outer pipe 2 in the state where the outer pipe 2 is fitted outside the inner pipe 1; and, in the state, configured so that the inner pipe 1 may have a plurality of bulges 3 and the top portions 9 at the outermost ends of the waves formed on the bulges 3 may touch the inner surface of the outer pipe 2.
- the inner pipe 1 has a plurality of bulges 3 extending in the radial directions from the center, the bulges 3 communicate with one another, and a plurality of grooves 10 is formed at the outer circumference of the center portion.
- the cross section hardly deforms when the inner pipe 1 and the outer pipe 2 are bent by applying external force. That is, since the top portions 9 of the waves of the inner pipe 1 touch the inner surface of the outer pipe 2, the top portions 9 support the outer pipe 2 in the event of plastic deformation. Resultantly, a specific bush or the like is not required at deforming and bending can be applied.
- a double pipe heat exchanger wherein only the center portions of the end edges of the bulges 3 on the outside in the radial directions touch the inner surface of the outer pipe 2 can further smoothen the flow of the second fluid 5 and accelerate the heat exchange. That is, the second fluid 5 can flow nearly all around the outer circumference of the bulges 3.
- a double pipe heat exchanger of the same configuration is used as an oil cooler to cool oil with cooling water, it is possible to provide an oil cooler conforming to various pipes and flow channels and contributing to space-saving.
- a method for producing a double pipe heat exchanger includes the processes of: inserting the inner pipe 1 into the outer pipe 2 while keeping the axis lines straight; welding only the opening rims 6 at both the ends of the inner pipe 1 in the axial direction of the axis line to the outer pipe 2; and successively bending the inner pipe 1 and the outer pipe 2 by applying external force.
- the heat exchanger has an outer pipe 2 and an inner pipe 1 that is inserted into the outer pipe 2.
- the inner pipe 1 is, except both the ends as shown in Fig. 1 , bent and formed into the shape of a three-leaf clover in cross section and the bulges 3 of the clover shape are bent into the shape of waves extending in the axial direction. Then the maximum radius of the clover shape is equal to the inner radius of the outer pipe 2. Both the ends of the inner pipe 1 are formed into a cylindrical shape and the outer diameter is equal to the inner diameter of the outer pipe 2. Further, three grooves 10 are formed at the outer circumference of the inner pipe 1 at the center portion.
- the bulges 3 are formed into the shape of an inflated balloon as it is obvious from Fig. 3 and they communicate with one another at the axis line (the center of the inner pipe 1).
- the width of each of the bulges 3 gradually increases up to the intermediate portion and then gradually decreases toward the tip thereof in the radius direction from the center of the inner pipe 1 to the outside. Then the inner pipe 1 is inserted into the outer pipe 2 so that only the top portions 9 at the tips may touch the outer pipe 2.
- the inner pipe 1 is inserted into the outer pipe 2 in the state of keeping the axis lines straight. Successively, only the opening rims 6 at the ends of the inner pipe 1 are fixed to the opening ends of the outer pipe 2 by welding. On this occasion, the top portions 9 at the tips of the bulges 3 touch the inner surface of the outer pipe 2. The contact points of the top portions 9 are not bonded.
- the pipes are bent in the state where the top portions 9 of the bulges 3 shown in Fig. 2 touch the inner surface of the outer pipe 2 to prevent the shape of the cross section of the outer pipe 2 from being extraordinarily deformed.
- the whole body is bent as shown in Fig. 4 , for example.
- the shape of the bending is formed so as to conform to the installation route of piping.
- a double pipe heat exchanger thus bent is connected through flanges 8 as a part of the outlet pipe for the exhaust gas of an engine.
- cooling water as the second fluid 5 flows in from one of the pair of pipes 11; flows between the inner pipe 1 and the outer pipe 2; and flows out from the other pipe 11.
- an exhaust gas as the first fluid 4 flows in the inner pipe 1 and the exhaust gas is cooled with the cooling water.
- the exhaust gas flows snakily in the bulges 3 where the exhaust gas flows comparatively easily.
- the cooling water also flows snakily on the outside of the inner pipe 1.
- the cooling water flows along the grooves 10 at the center portion of the inner pipe 1.
- the double pipe heat exchanger can be used as an oil cooler in place of the EGR cooler.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Description
- The present invention relates to a double pipe heat exchanger that is: used as an EGR cooler, an oil cooler, or the like; and bent along the piping route of a vehicle.
- An EGR cooler is interposed in the middle of the pipe for the exhaust gas of an engine and cools the exhaust gas with cooling water. An example thereof is "a double pipe heat exchanger" disclosed in Japanese Unexamined Patent Publication No.
2000-161871 - The heat exchanger has a double pipe structure comprising an inner pipe and an outer pipe, and radiator fins are integrally bent and formed at an intermediate portion in the axial direction of the inner pipe. That is, a large number of protrusions are formed in the radial directions from the center in a cross section at the intermediate portion of the inner pipe.
-
JP2002-013882 claim 1. - A conventional EGR cooler is interposed into a linear part located in the middle of the exhaust gas pipe for an engine. As a result, the positioning of the EGR cooler is inflexible, the number of parts increases, and the production cost as a whole has been obliged to increase.
- In view of the above situation, an object of the present invention is to provide: a double pipe heat exchanger that has a simple structure and can be easily bent along a piping route; and a method for producing the double pipe heat exchanger.
- The present invention according to
Claim 1 is a double pipe heat exchanger wherein: - an outer pipe (2) is fitted outside an inner pipe (1) and wherein a first fluid (4) flows in the inner pipe (1); and
- a second fluid (5) flows between the inner pipe (1) and the outer pipe (2);
- in a cross section orthogonal to the axis line of the inner pipe (1), the inner pipe (1) has a plurality of balloon-shaped bulges (3) communicating with one another and extending in the radial directions from the center, and the width of each of the bulges (3) is the largest at an intermediate portion between the center and the outside of the inner pipe (1) in a radial direction and gradually decreases toward both the sides of the bulge (3) in the radial direction;
- a plurality of grooves (10) is formed on the outer surface side at the center portion of the inner pipe (1) in the manner of extending in an axial direction thereof;
- the outer circumference of each of the bulges (3) is bent into the shape of waves in an axial cross-section;
- each top portion (9) of the wave touches the inner surface of the outer pipe (2) at the outermost end of the bulge (3) in the radial directions in an axial cross-section;
- the axis lines of the outer pipe (2) and the inner pipe (1) are bent, and wherein said heat exchanger is formed by bending the inner pipe and the outer pipe after the outer pipe is fitted outside the inner pipe.
- The present invention according to
Claim 2 is a double pipe heat exchanger according toClaim 1, wherein only the center portions of the end edges of the balloon-shaped bulges (3) on the outside in the radial directions touch the inner surface of the outer pipe (2). - The present invention according to
Claim 3 is a double pipe heat exchanger according toClaim - opening rims (6) at both the ends of the inner pipe (1) in the axial direction are connected and fixed to the inner surface of the outer pipe (2) all around the rims;
- a pair of ports (7) for the first fluid (4) is provided on the outer surface at both the ends of the outer pipe (2) ;
- flanges (8) for connection are protrusively attached to both the ends of the outer pipe (2); and
- the double pipe heat exchanger is used as an EGR cooler wherein the exhaust gas of an engine flows as the first fluid (4) and cooling water flows as the second fluid (5).
- The present invention according to
Claim 4 is a double pipe heat exchanger according toClaim - opening rims (6) at both the ends of the inner pipe (1) in the axial direction are connected and fixed to the inner surface of the outer pipe (2) all around the rims;
- a pair of ports (7) for the first fluid (4) is provided on the outer surface at both the ends of the outer pipe (2) ;
- flanges (8) for connection are protrusively attached to both the ends of the outer pipe (2); and
- the double pipe heat exchanger is used as an oil cooler wherein one of the first fluid (4) and the second fluid (5) is cooling water and the other is oil.
- The present invention according to
Claim 5 is a double pipe heat exchanger according to any one ofClaims 1 to 4, wherein, in an axial cross-section of the inner pipe (1) : - the three balloon-shaped bulges (3) communicate with one another in the center; and
- the whole appearance of the inner pipe (1) is formed into the shape of a three-leaf clover.
- The present invention according to
Claim 6 is a method for producing a double pipe heat exchanger according to any one ofClaims 1 to 5, comprising the processes of: - inserting the inner pipe (1) into the outer pipe (2) and bringing the top portions (9) of the waves of the bulges (3) of the inner pipe (1) into contact with the inner surface of the outer pipe (2) while keeping each of the axis lines straight;
- welding only the opening rims (6) at both the ends of the inner pipe (1) in the axial direction to the outer pipe (2); and
- successively applying external force to the inner pipe (1) and the outer pipe (2) and bending the whole body so as to bend the axis lines of the pipes.
- A double pipe heat exchanger and a production method thereof according to the present invention are configured as stated above and exhibit the following effects.
- A double pipe heat exchanger according to the present invention is: formed by bending the
inner pipe 1 and theouter pipe 2 in the state where theouter pipe 2 is fitted outside theinner pipe 1; and, in the state, configured so that theinner pipe 1 may have a plurality ofbulges 3 and thetop portions 9 at the outermost ends of the waves formed on thebulges 3 may touch the inner surface of theouter pipe 2. Hence, it is possible to: smoothly curve the axis lines of theinner pipe 1 and theouter pipe 2 in the state of keeping the cross sectional shapes of theinner pipe 1 and theouter pipe 2; and realize a highly accurate double pipe heat exchanger. - Further, the
inner pipe 1 has a plurality ofbulges 3 extending in the radial directions from the center, thebulges 3 communicate with one another, and a plurality ofgrooves 10 is formed at the outer circumference of the center portion. Hence, the effects that the heat transfer area increases, agitation is caused by the wavy surfaces of thebulges 3, and thus the heat exchange can be accelerated are exhibited. - Yet further, the cross section hardly deforms when the
inner pipe 1 and theouter pipe 2 are bent by applying external force. That is, since thetop portions 9 of the waves of theinner pipe 1 touch the inner surface of theouter pipe 2, thetop portions 9 support theouter pipe 2 in the event of plastic deformation. Resultantly, a specific bush or the like is not required at deforming and bending can be applied. - Furthermore, the bending can be facilitated. Then the outer circumference of each of the
bulges 3 is bent in the shape of waves in an axial cross-section and thetop portions 9 of the waves touch the inner surface of theouter pipe 2 at the outermost ends of thebulges 3. Hence, the flow channel of thesecond fluid 5 is not segmented and thus it is possible to sufficiently agitate thesecond fluid 5 and accelerate the heat exchange. - In addition, it is possible to provide a double pipe heat exchanger having a simple structure and being excellent in heat exchange performance.
- In the above configuration, a double pipe heat exchanger wherein only the center portions of the end edges of the
bulges 3 on the outside in the radial directions touch the inner surface of theouter pipe 2 can further smoothen the flow of thesecond fluid 5 and accelerate the heat exchange. That is, thesecond fluid 5 can flow nearly all around the outer circumference of thebulges 3. - Next, with a double pipe heat exchanger wherein the
opening rims 6 at both the ends of theinner pipe 1 are connected and fixed to the inner surface of theouter pipe 2 all around the rims, theflanges 8 are protrusively attached to both the ends of theouter pipe 2, and the heat exchanger is used as an EGR cooler wherein an exhaust gas and cooling water flow, it is possible to: facilitate the attachment of the EGR cooler to pipes; and provide an EGR cooler contributing to space-saving. - Further, when a double pipe heat exchanger of the same configuration is used as an oil cooler to cool oil with cooling water, it is possible to provide an oil cooler conforming to various pipes and flow channels and contributing to space-saving.
- In the above configuration, by forming the appearance of the
inner pipe 1 into the shape of a three-leaf clover in a cross section of theinner pipe 1, it is possible to provide a heat exchanger that: allows thesecond fluid 5 to flow uniformly at each part of the outer circumference of theinner pipe 1; and exhibits high heat exchange performance. Besides, it is possible to: bring the outer circumference of theinner pipe 1 into contact with the inner circumference of theouter pipe 2 in a balanced manner; bend the integrated body of theinner pipe 1 and theouter pipe 2 while avoiding extraordinary deformation of the cross sectional shape of theouter pipe 2; and provide a high performance heat exchanger. - A method for producing a double pipe heat exchanger according to the present invention includes the processes of: inserting the
inner pipe 1 into theouter pipe 2 while keeping the axis lines straight; welding only theopening rims 6 at both the ends of theinner pipe 1 in the axial direction of the axis line to theouter pipe 2; and successively bending theinner pipe 1 and theouter pipe 2 by applying external force. By so doing, it is possible to: provide a double pipe heat exchanger the whole body of which is curved without changing the cross sectional shapes of theinner pipe 1 and theouter pipe 2; and use the heat exchanger also as a part of piping. -
-
Fig. 1 is an explanatory view showing the first production process of a double pipe heat exchanger according to the present invention. -
Fig. 2 is a vertical sectional view of the substantial part showing the second production process of the double pipe heat exchanger. -
Fig. 3 is a sectional view taken on line III-III ofFig. 2 . -
Fig. 4 is a perspective explanatory view of a double pipe heat exchanger completed through the third production process. - Next, embodiments according to the present invention will be described in reference to drawings.
- The heat exchanger has an
outer pipe 2 and aninner pipe 1 that is inserted into theouter pipe 2. - The
inner pipe 1 is, except both the ends as shown inFig. 1 , bent and formed into the shape of a three-leaf clover in cross section and thebulges 3 of the clover shape are bent into the shape of waves extending in the axial direction. Then the maximum radius of the clover shape is equal to the inner radius of theouter pipe 2. Both the ends of theinner pipe 1 are formed into a cylindrical shape and the outer diameter is equal to the inner diameter of theouter pipe 2. Further, threegrooves 10 are formed at the outer circumference of theinner pipe 1 at the center portion. - The
bulges 3 are formed into the shape of an inflated balloon as it is obvious fromFig. 3 and they communicate with one another at the axis line (the center of the inner pipe 1). The width of each of thebulges 3 gradually increases up to the intermediate portion and then gradually decreases toward the tip thereof in the radius direction from the center of theinner pipe 1 to the outside. Then theinner pipe 1 is inserted into theouter pipe 2 so that only thetop portions 9 at the tips may touch theouter pipe 2. - With regard to the
outer pipe 2, as it is obvious fromFig. 1 , a pair offlanges 8 is welded and fixed to both the ends of theouter pipe 2, a pair ofports 7 is provided at both the end portions in the axial direction, and thepipes 11 are protrusively attached there. - With regard to the
inner pipe 1 and theouter pipe 2 thus produced, theinner pipe 1 is inserted into theouter pipe 2 in the state of keeping the axis lines straight. Successively, only the opening rims 6 at the ends of theinner pipe 1 are fixed to the opening ends of theouter pipe 2 by welding. On this occasion, thetop portions 9 at the tips of thebulges 3 touch the inner surface of theouter pipe 2. The contact points of thetop portions 9 are not bonded. - Successively, external force is applied from the outer circumference of the
outer pipe 2 and theouter pipe 2 is bent together with theinner pipe 1 as shown inFig. 4 . On this occasion, the axis line is deformed in the state where thetop portions 9 of thebulges 3 of theinner pipe 1 are supported by the inner surface of theouter pipe 2. - In that regard, the pipes are bent in the state where the
top portions 9 of thebulges 3 shown inFig. 2 touch the inner surface of theouter pipe 2 to prevent the shape of the cross section of theouter pipe 2 from being extraordinarily deformed. Thereby, the whole body is bent as shown inFig. 4 , for example. The shape of the bending is formed so as to conform to the installation route of piping. - A double pipe heat exchanger thus bent is connected through
flanges 8 as a part of the outlet pipe for the exhaust gas of an engine. Then cooling water as the second fluid 5: flows in from one of the pair ofpipes 11; flows between theinner pipe 1 and theouter pipe 2; and flows out from theother pipe 11. Meanwhile, an exhaust gas as thefirst fluid 4 flows in theinner pipe 1 and the exhaust gas is cooled with the cooling water. The exhaust gas flows snakily in thebulges 3 where the exhaust gas flows comparatively easily. Likewise, the cooling water also flows snakily on the outside of theinner pipe 1. At the same time, the cooling water flows along thegrooves 10 at the center portion of theinner pipe 1. - Although descriptions have been made on the basis of an EGR cooler in the above embodiment, the double pipe heat exchanger can be used as an oil cooler in place of the EGR cooler. On this occasion, it is possible to: run oil between the
inner pipe 1 and theouter pipe 2; and run cooling water in theinner pipe 1. Otherwise, it is also acceptable to: run the cooling water between theinner pipe 1 and theouter pipe 2; and run the oil in theinner pipe 1.
Claims (6)
- A double pipe heat exchanger wherein:an outer pipe (2) is fitted outside an inner pipe (1) and wherein a first fluid (4) flows in the inner pipe (1) anda second fluid (5) flows between the inner pipe (1) and the outer pipe (2);in a cross section orthogonal to the axis line of the inner pipe (1), the inner pipe (1) has a plurality of balloon-shaped bulges (3) communicating with one another and extending in the radial directions from the center, and the width of each of the bulges (3) is the largest at an intermediate portion between the center and the outside of the inner pipe (1) in a radial direction and gradually decreases toward both the sides of the bulge (3) in the radial direction; anda plurality of grooves (10) is formed on the outer surface side at the center portion of the inner pipe (1) in the manner of extending in an axial direction thereof;characterised in that the outer circumference of each of the bulges (3) is bent into the shape of waves in an axial cross-section;each top portion (9) of the wave touches the inner surface of the outer pipe (2) at the outermost end of the bulges (3) in the radial directions in the cross section;the axis lines of the outer pipe (2) and the inner pipe (1) are bent and wherein said heat exchanger is formed by bending the inner pipe (1) and outer pipe (2) after the outer pipe (2) is fitted outside the inner pipe (1).
- The double pipe heat exchanger according to Claim 1, wherein only the center portions of the end edges of said balloon-shaped bulges (3) on the outside in the radial directions touch the inner surface of said outer pipe (2) .
- The double pipe heat exchanger according to Claim 1 or 2, wherein:opening rims (6) at both the ends of the inner pipe (1) in the axial direction are connected and fixed to the inner surface of the outer pipe (2) all around the rims;a pair of ports (7) for the first fluid (4) is provided on the outer surface at both the ends of the outer pipe (2) ;flanges (8) for connection are protrusively attached to both the ends of the outer pipe (2); andthe double pipe heat exchanger is used as an EGR cooler wherein the exhaust gas of an engine flows as the first fluid (4) and cooling water flows as the second fluid (5).
- The double pipe heat exchanger according to Claim 1 or 2, wherein:opening rims (6) at both the ends of the inner pipe (1) in the axial direction are connected and fixed to the inner surface of the outer pipe (2) all around the rims;a pair of ports (7) for the first fluid (4) is provided on the outer surface at both the ends of the outer pipe (2) ;flanges (8) for connection are protrusively attached to both the ends of the outer pipe (2); andthe double pipe heat exchanger is used as an oil cooler wherein one of the first fluid (4) and the second fluid (5) is cooling water and the other is an oil.
- The double pipe heat exchanger according to any one of Claims 1 to 4, wherein, in an axial cross-section of said inner pipe (1):the three balloon-shaped bulges (3) communicate with one another in the center; andthe whole appearance of the inner pipe (1) is formed into the shape of a three-leaf clover.
- A method for producing a double pipe heat exchanger according to any one of Claims 1 to 5, comprising the processes of:inserting the inner pipe (1) into the outer pipe (2) and bringing the top portions (9) of the waves of the bulges (3) of the inner pipe (1) into contact with the inner surface of the outer pipe (2) while keeping each of the axis lines straight;welding only the opening rims (6) at both the ends of the inner pipe (1) in the axial direction to the outer pipe (2); andsuccessively applying external force to the inner pipe (1) and the outer pipe (2) and bending the whole body so as to bend the axis lines of the pipes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/001179 WO2006077657A1 (en) | 2005-01-21 | 2005-01-21 | Double pipe heat exchanger and method of manufacturing the same |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1840495A1 EP1840495A1 (en) | 2007-10-03 |
EP1840495A4 EP1840495A4 (en) | 2008-05-28 |
EP1840495B1 true EP1840495B1 (en) | 2010-03-03 |
Family
ID=36692055
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05704232A Not-in-force EP1840495B1 (en) | 2005-01-21 | 2005-01-21 | Double pipe heat exchanger and method of manufacturing the same |
Country Status (5)
Country | Link |
---|---|
US (1) | US20080141665A1 (en) |
EP (1) | EP1840495B1 (en) |
CN (1) | CN100510599C (en) |
DE (1) | DE602005019787D1 (en) |
WO (1) | WO2006077657A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4698417B2 (en) * | 2005-12-28 | 2011-06-08 | 株式会社デンソー | Manufacturing method of double pipe |
DE202006013279U1 (en) * | 2006-08-30 | 2008-01-17 | Dolmar Gmbh | Motor operated implement |
US8267033B2 (en) * | 2008-01-22 | 2012-09-18 | Lockheed Martin Corporation | Clathrate glider with heat exchanger |
GB0909221D0 (en) * | 2009-04-30 | 2009-07-15 | Eaton Fluid Power Gmbh | Heat exchanger |
KR101608996B1 (en) * | 2010-01-11 | 2016-04-05 | 엘지전자 주식회사 | Heat exchanger |
DE102010047092A1 (en) * | 2010-10-01 | 2012-04-05 | Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) | Charge air cooling device for an internal combustion engine |
CN102607300B (en) * | 2012-03-16 | 2013-08-28 | 赵晓东 | Spiral baffle double-pipe heat exchanger |
DE102013007590A1 (en) * | 2013-05-02 | 2014-11-06 | GM Global Technology Operations LLC (n. d. Gesetzen des Staates Delaware) | Internal heat exchanger for a motor vehicle air conditioning system |
CN103411454A (en) * | 2013-08-29 | 2013-11-27 | 哈尔滨工业大学 | Tube type heat exchanger with outer-protruding-type corrugated tubes arranged in staggering mode |
DE102017109191A1 (en) * | 2017-04-28 | 2018-10-31 | Faurecia Emissions Control Technologies, Germany Gmbh | Component of an exhaust system and method for producing such a component |
CN108225057A (en) * | 2018-02-11 | 2018-06-29 | 佛山科学技术学院 | A kind of concave surface heat exchanger tube double pipe heat exchanger |
JP7045303B2 (en) * | 2018-10-31 | 2022-03-31 | 株式会社クボタ | Engine with supercharger |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1787904A (en) * | 1927-05-02 | 1931-01-06 | Francis J Heyward | Car heater |
US1920059A (en) * | 1932-05-16 | 1933-07-25 | Buschbaum Fred | Exhaust operated heater |
US2259433A (en) * | 1937-11-15 | 1941-10-14 | Hoover Co | Heat exchanger |
US2204294A (en) * | 1938-06-23 | 1940-06-11 | Eclipse Aviat Corp | Exhaust pipe |
DE1129516B (en) * | 1955-10-04 | 1962-05-17 | Andre Huet | Pipe heat exchanger, the heat exchange surface of which consists of many pairs of coaxially inserted pipes |
US3105708A (en) * | 1960-04-20 | 1963-10-01 | Howard E Esty | Water jacketed exhaust attachment for internal combustion engine |
US3777343A (en) * | 1971-03-11 | 1973-12-11 | Spiral Tubing Corp | Method for forming a helically corrugated concentric tubing unit |
US4194560A (en) * | 1976-03-19 | 1980-03-25 | Nihon Radiator Co., Ltd. | Oil cooler and method for forming it |
US4437513A (en) * | 1978-06-02 | 1984-03-20 | Joseph Castiglioni | Heat recovery apparatus |
US4393926A (en) * | 1981-04-06 | 1983-07-19 | Appel Gary H | Clover heat exchanger core |
US5311661A (en) * | 1992-10-19 | 1994-05-17 | Packless Metal Hose Inc. | Method of pointing and corrugating heat exchange tubing |
JP2590250Y2 (en) * | 1992-10-20 | 1999-02-10 | 神鋼メタルプロダクツ株式会社 | Heat exchanger |
US5573062A (en) * | 1992-12-30 | 1996-11-12 | The Furukawa Electric Co., Ltd. | Heat transfer tube for absorption refrigerating machine |
JP2000161871A (en) * | 1998-11-25 | 2000-06-16 | Toyota Motor Corp | Double piping type heat exchanger |
DE19909368C1 (en) * | 1999-03-03 | 2000-08-10 | Hde Metallwerk Gmbh | Heat exchanger tube with inner and outer tubes involves at least one tube with rib type formations forming screw-line flow channel over axial length |
JP2002013882A (en) * | 2000-06-30 | 2002-01-18 | Matsushita Refrig Co Ltd | Double pipe heat exchanger and refrigerating cycle device using it |
US6488079B2 (en) * | 2000-12-15 | 2002-12-03 | Packless Metal Hose, Inc. | Corrugated heat exchanger element having grooved inner and outer surfaces |
CN2462328Y (en) * | 2000-12-20 | 2001-11-28 | 四平市巨元换热设备有限公司 | Detatchable shaped sleeve type heat exchanger |
JP2002228371A (en) * | 2001-02-06 | 2002-08-14 | Hitachi Ltd | Heat exchanger |
JP3079576U (en) * | 2001-02-14 | 2001-08-24 | 株式会社ティグ | Heat exchanger tubes |
-
2005
- 2005-01-21 CN CN200580046959.8A patent/CN100510599C/en not_active Expired - Fee Related
- 2005-01-21 WO PCT/JP2005/001179 patent/WO2006077657A1/en active Application Filing
- 2005-01-21 DE DE602005019787T patent/DE602005019787D1/en active Active
- 2005-01-21 US US11/795,193 patent/US20080141665A1/en not_active Abandoned
- 2005-01-21 EP EP05704232A patent/EP1840495B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
CN100510599C (en) | 2009-07-08 |
CN101103243A (en) | 2008-01-09 |
WO2006077657A1 (en) | 2006-07-27 |
DE602005019787D1 (en) | 2010-04-15 |
EP1840495A4 (en) | 2008-05-28 |
US20080141665A1 (en) | 2008-06-19 |
EP1840495A1 (en) | 2007-10-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1840495B1 (en) | Double pipe heat exchanger and method of manufacturing the same | |
EP1734325B1 (en) | Double-tube heat exchanger and method of producing the same | |
US6523603B2 (en) | Double heat exchanger with condenser and radiator | |
JP4347961B2 (en) | Multiway flat tube | |
JP2002538411A (en) | Welding heat exchanger with grommet structure | |
JPH0726956A (en) | Oil cooler | |
JP2002181481A (en) | Heat exchanger and its manufacturing method | |
JPH09310995A (en) | Egr gas cooler | |
JP2002153931A (en) | Heat exchange tube and finless heat exchanger | |
JP4440574B2 (en) | Double tube heat exchanger and manufacturing method thereof | |
JP2016012616A (en) | Heat exchanger | |
EP2425193A2 (en) | Heat exchanger | |
JP2007506931A (en) | Curved heat exchanger and manufacturing method thereof | |
CN110567298A (en) | Nested formula spiral baffling board and heat exchanger | |
JPH07260393A (en) | Header for heat exchanger and tank structure | |
JPH1123184A (en) | Heat exchanger | |
CN109282675B (en) | Sleeve type heat exchanger, method and mold for manufacturing same | |
KR102343097B1 (en) | Tube for heat exchanger, manufacturing method of the same, and heat exchanger | |
JP2007187381A (en) | Heat exchanger | |
JP2005321122A (en) | Tubular type heat exchanger | |
JP2009092269A (en) | Double tube-type heat exchanger | |
KR102438785B1 (en) | Manufacturing method of tube for heat exchanger, tube for heat exchanger manufactured thereby, and heat exchanger | |
JP2963222B2 (en) | Brazing joint structure of heat exchange medium inlet and outlet tubes in heat exchanger | |
KR20030081877A (en) | Oil Cooler for Car | |
JP3836966B2 (en) | Tube for heat exchanger |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20070720 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CZ DE IT |
|
RBV | Designated contracting states (corrected) |
Designated state(s): CZ DE IT |
|
DAX | Request for extension of the european patent (deleted) | ||
A4 | Supplementary search report drawn up and despatched |
Effective date: 20080502 |
|
17Q | First examination report despatched |
Effective date: 20080908 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAC | Information related to communication of intention to grant a patent modified |
Free format text: ORIGINAL CODE: EPIDOSCIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): CZ DE IT |
|
REF | Corresponds to: |
Ref document number: 602005019787 Country of ref document: DE Date of ref document: 20100415 Kind code of ref document: P |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20101206 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CZ Payment date: 20101231 Year of fee payment: 7 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20120118 Year of fee payment: 8 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20120114 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CZ Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130121 Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130801 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R119 Ref document number: 602005019787 Country of ref document: DE Effective date: 20130801 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20130121 |