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US20150300755A1 - Heat exchanger tube - Google Patents

Heat exchanger tube Download PDF

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Publication number
US20150300755A1
US20150300755A1 US14/438,893 US201314438893A US2015300755A1 US 20150300755 A1 US20150300755 A1 US 20150300755A1 US 201314438893 A US201314438893 A US 201314438893A US 2015300755 A1 US2015300755 A1 US 2015300755A1
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US
United States
Prior art keywords
wave
heat exchanger
flow path
exchanger tube
tube
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.)
Abandoned
Application number
US14/438,893
Inventor
Kyouhei Takimoto
Takashi Kaneda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marelli Corp
Original Assignee
Calsonic Kansei Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Calsonic Kansei Corp filed Critical Calsonic Kansei Corp
Assigned to CALSONIC KANSEI CORPORATION reassignment CALSONIC KANSEI CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KANEDA, TAKASHI, TAKIMOTO, Kyouhei
Publication of US20150300755A1 publication Critical patent/US20150300755A1/en
Abandoned legal-status Critical Current

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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
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • F28F3/046—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element the deformations being linear, e.g. corrugations
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0308—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other
    • F28D1/0325—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another
    • F28D1/0333—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another the plates having integrated connecting members
    • F28D1/0341—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits the conduits being formed by paired plates touching each other the plates having lateral openings therein for circulation of the heat-exchange medium from one conduit to another the plates having integrated connecting members with U-flow or serpentine-flow inside the conduits
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/047—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag
    • F28D1/0471—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being bent, e.g. in a serpentine or zig-zag the conduits having a non-circular cross-section
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F28F1/16—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means being integral with the element, e.g. formed by extrusion
    • F28F1/18—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means being integral with the element, e.g. formed by extrusion the element being built-up from finned sections
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F28F1/22—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means having portions engaging further tubular elements

Definitions

  • the invention relates to a heat exchanger tube.
  • Such conventional heat exchanger tubes respectively include a tube member the two outsides of which are formed of beads except for the entrance and exit parts thereof and the central portion of which has a partition bead and a flow path enabling a medium to flow in a U-like manner therethrough.
  • the path has a large number of projecting portions projecting inward in order to stir the flowing medium for enhancing heat radiation performance.
  • Two tube plates having such structure are assembled together to form the tube.
  • Patent Document 1 JP-A-H02-169127
  • Patent Document 2 WO 1983-04090 A1
  • the invention aims at solving the above problem and thus it is an object of the invention to provide a heat exchanger tube which, while preventing the increased flow resistance when the medium flows, can enhance the heat radiation performance.
  • the heat exchanger tube of the invention comprises: an entrance part for a medium; an exit part for the medium; and, an upstream side linear flow path part and a downstream side linear flow path part connecting the entrance and exist parts to each other and enabling the medium to flow therethrough, wherein at least one of the upstream and downstream side flow path parts includes, in the flow path of the medium, wave-shaped portions extending in the longitudinal direction of the tube and continuing with each other for guiding the medium.
  • the flow resistance can be restricted and the stirring of the medium by the wave-shaped portions can enhance the heat radiation performance.
  • FIG. 1 is a section view of a heat exchanger tube according to an embodiment 1 of the invention.
  • FIG. 2 is a section view of a heat exchanger tube according to an embodiment 2 of the invention.
  • FIG. 3 is section view of the heat exchanger tube according to the embodiment 2, taken along the S 3 -S 3 line of FIG. 2 .
  • FIG. 4 is section view of the heat exchanger tube according to the embodiment 2, taken along the S 4 -S 4 line of FIG. 2 .
  • the heat exchanger tube 1 of the embodiment 1 is used in a water-cooling type charge air cooler for cooling the compressed air of a charger (turbocharger or supercharger) attached to an internal combustion engine.
  • the heat exchanger tube 1 is produced by assembling together two half-divided tube plates.
  • the tube 1 includes an outer peripheral rib portion 1 a which projects inward in the thickness direction (height direction) thereof along the outer periphery thereof except for the entrance part 2 and exit part 3 thereof.
  • the tube 1 includes a partition rib portion (corresponding to a partition portion) 1 b formed at the central position in the width direction (vertical direction in FIG. 1 ) of the tube 1 and extending toward the longitudinal direction (horizontal direction in FIG. 1 ) of the tube from between the entrance part 2 and exist part 3 disposed on one end side of the tube 1 .
  • the rib portion 1 b extends up to the vicinity of a U-turn flow path part 4 C (which is described later) on the other end side of the tube 1 .
  • the rib portion 1 b separates the tube 1 into two areas, that is, an upstream side linear flow path part 4 A and a downstream side linear flow path part 4 B.
  • the downstream side end of the upstream side linear flow path part 4 A and the upstream side end of the downstream side linear flow path part 4 b are allowed to communicate with each other on the other end side of the tube 1 by the U-turn flow path part 4 C.
  • the entrance part 2 and exit part 3 are arranged side by side in the width direction of the tube 1 .
  • a parallel circuit with the cooling water of the engine used as the medium or a portion of the cooling water of the engine introduced therein, or an independent circuit (for example, a cooling water circuit for a charger-air-cooler) different from the cooling water of the engine are allowed to enter and leave the entrance part 2 and exit part 3 through the penetration holes thereof.
  • the entrance part 2 is connected to the upstream side end of the upstream side linear flow path part 4 A continuously therewith, while the exit part 3 is connected to the downstream side end of the downstream side linear flow path part 4 B continuously therewith.
  • the upstream side linear flow path part 4 A includes three upstream side flow paths 4 A 1 , 4 A 2 and 4 A 3 respectively between the outer peripheral rib portion 1 a existing on the upper side of FIG. 1 and partition rib portion 1 b .
  • the upstream side flow paths 4 A 1 , 4 A 2 and 4 A 3 respectively include wave-shaped multiple projecting sections 5 a , 5 b which project side by side inward in the thickness direction (on this side in FIG. 1 ) between the outer peripheral rib portion 1 a and partition rib portion 1 b and are wave-formed when viewed from above the thickness direction.
  • the downstream side linear flow path part 4 B includes three downstream side flow paths 4 B 1 , 4 B 2 and 4 B 3 respectively between the outer peripheral rib portion 1 a existing on the lower side of FIG. 1 and partition rib portion 1 b .
  • the downstream side flow paths 4 B 1 , 4 B 2 and 4 B 3 respectively include wave-shaped multiple projecting portions 5 c , 5 d which project side by side inward in the thickness direction between the outer peripheral rib portion 1 a and partition rib portion 1 b and are wave-formed when viewed from above the thickness direction.
  • the wave-shaped projecting portions 5 a , 5 b , 5 c , 5 d correspond to the wave-shaped portions of the invention.
  • the U-turn path part 4 C includes multiple arc-shaped projecting portions 6 a , 6 b which are formed inside the outer peripheral rib portion 1 a on the other end side of the tube 1 , project inward in the thickness direction and are arc-shaped when viewed from above the thickness direction.
  • the curvature of the arc-shaped projecting portion 6 a is set larger than that of the arc-shaped projecting portion 6 b.
  • the U-turn path part 4 C between the outer peripheral rib portion 1 a and the outside arc-shaped projecting portion 6 a , between the outside arc-shaped projecting portion 6 a and inside arc-shaped projecting portion 6 b , and between the inside arc-shaped projecting portion 6 b and the other end side end of the partition rib portion 1 b , there are formed a total of three U-turn flow paths 4 C 1 , 4 C 2 and 4 C 3 respectively.
  • the curvatures of the U-turn flow paths 4 C 1 , 4 C 2 and 4 C 3 are set such that the inflow direction and outflow direction of the medium can be changed 180° from each other.
  • the two ends of the outside arc-shaped projecting portion 6 a respectively continue with the downstream side end of the wave-shaped projecting portion 5 a and the upstream side end of the wave-shaped projecting portion 5 d .
  • This enables the medium to flow through the entrance part 2 , outside upstream side flow path 4 A 1 , outside U-turn flow path 4 C 1 , outside downstream side flow path 4 B 1 and exit part 3 .
  • the two ends of the inside arc-shaped projecting portion 6 b respectively continue with the downstream side end of the wave-shaped projecting portion 5 b and the upstream side end of the wave-shaped projecting portion 5 c .
  • This enables the medium to flow through the entrance part 2 , central upstream side flow path 4 A 2 , central U-turn flow path 4 C 2 , central downstream side flow path 4 B 2 and exit part 4 , and also through the entrance part 2 , inside upstream side flow path 4 A 3 , inside U-turn flow path 4 C 3 , outside downstream side flow path 4 B 3 and exit part 3 .
  • the upstream side end of the outside arc-shaped projecting portion 6 a and the downstream side end of the wave-shaped projecting portion 5 a , and the upstream side end of the inside arc-shaped projecting portion 6 b and the downstream side end of the wave-shaped projecting portion 5 b are connected to each other respectively by linear projecting portions 7 a and 7 b which are respectively extended by a specific distance toward upstream from the downstream side end of the partition rib portion 1 b.
  • the third tube plate includes wave-shaped projecting portions and arc-shaped projecting portions having the shapes and positions of images reflected by mirrors which are so parallel arranged upwardly of FIG. 1 as to face FIG. 1 .
  • the tube plate having the shape of FIG. 1 and the third tube plate are assembled together.
  • the wave-shaped projecting portions, arc-shaped projecting portions and linear projecting portions of these tube plates are opposed to each other at the same positions.
  • the wave-shaped projecting portions, arc-shaped projecting portions, linear projecting portions, outer peripheral rib portions and partition rib portions of these tube plates are fixed together by brazing or the like, thereby providing the tube 1 .
  • the cooling water supplied from the entrance part 2 flows meandering through the three upstream side flow paths 4 A 1 , 4 A 2 and 4 A 3 within the upstream side linear path portion 4 A under the control of the wave-shaped projecting portions 5 a , 5 b , and flows into the U-turn flow path part 4 C along the linear projecting portions 7 a , 7 b.
  • the flow direction of the cooling water is gradually changed 180° within the three arc-shaped U-turn flow paths 4 C 1 , 4 C 2 and 4 C 3 along the arc-shaped projecting portions 6 a and 6 b , thereby guiding the cooling water to the three downstream side flow paths 4 B 1 , 4 B 2 and 4 B 3 .
  • the medium advances meandering within the three wave-shaped downstream side flow paths 4 B 1 , 4 B 2 and 4 B 3 under the control of the wave-shaped projecting portions 5 c and 5 d , and flows out from the exit part 3 .
  • the cooling water while being stirred as in conventional dimples or the like, flows within the tube.
  • the wave-like meandering of the cooling water can restrict an increase in the flow resistance and can secure the heat radiation performance.
  • the direction of the cooling water is gradually changed. This can reduce the possibility that the cooling water can strike strongly at the end of the tube and thus can be damaged by erosion.
  • the high-temperature compressed air flowing outside the tube passes the tube exchanges its heat with the cooling water, whereby it is cooled. After fuel is blown into this air, the mixture thereof is combusted in the combustion room of the engine.
  • the heat exchanger tube of the embodiment 1 can provide the following effects.
  • the wave-shaped projecting portions 5 a , 5 b , 5 c , 5 d are formed in the upstream side and downstream side linear flow path parts 4 A and 4 B, the flow resistance when the cooling water flows can be restricted, and also since the cooling water flows along the wave-shaped projecting portions 5 a , 5 b , 5 c , 5 d , the heat radiation performance can be enhanced.
  • the tube 1 is manufactured by assembling together the two half-divided tube plates, the tube 1 can be manufactured easily and inexpensively.
  • the wave-shaped projecting portions 5 a , 5 b , 5 c , 5 d of the two tube plates are arranged to provide the same positions and the wave-shaped projecting portions 5 a , 5 b , 5 c , 5 d are continuously opposed to each other, thereby enabling the cooling water to meander.
  • the ends of the arc-shaped projecting portions 6 a , 6 b of the U-turn flow path part 4 C are arranged to straddle the downstream side end of the partition rib part 1 b , thereby enabling restriction of disturbance of the cooling water here. That is, the cooling water is enabled to flow smoothly between the linear flow path parts (between the upstream side and downstream side linear flow path parts 4 A and 4 B), whereby the flow resistance can be restricted.
  • FIG. 2 shows a heat exchanger tube 1 of an embodiment 2.
  • the heat exchanger tube 1 of the embodiment 2 there are prepared two tube plates having the same structure of the embodiment 1.
  • One tube plate is inverted and combined with the other to provide the tube 1 .
  • the mirror-reflected third tube plate of the embodiment 1 is not used.
  • the wave-shaped projecting portions 5 a , 5 b , 5 c , 5 d of the upstream side and downstream side linear flow path parts 4 A, 4 B and the arc-shaped projecting portions 6 a , 6 b respectively formed in the other tube are disposed as shown by broken lines in FIG. 2 .
  • the wave-shaped projecting portions 5 a , 5 b and wave-shaped projecting portions 5 c , 5 d which are paired wave-shaped portions, are alternately arranged side by side.
  • the wave-shaped portions only the partial sections of the wave-shaped projecting sections 5 a , 5 b constituted of the paired wave-shaped portions (or, the wave-shaped projecting portions 5 c , 5 d ) cross each other, while only such partial sections are opposed to each other.
  • FIG. 3 is a transverse section view taken along the S 3 -S 3 line passing the above-mentioned mutually shifted sections
  • FIG. 4 is a section view taken along the S 4 -S 4 line passing the above-mentioned mutually opposed sections.
  • the tube 1 can be manufactured more inexpensively than the embodiment 1.
  • the wave-shaped projecting portions 5 a , 5 b are formed in both of the upstream side and downstream side linear flow path parts 4 A and 4 B.
  • the portions may also be formed only in one of the two parts.
  • the medium may also be guided using inner fins instead of the wave-shaped projecting portions 5 a , 5 b and arc-shaped projecting portions 6 a , 6 b .
  • Use of the inner fins can enhance the setting freedom of the shape of the wave-shaped portions.
  • the respective arc-shaped and wave-shaped projections are connected to each other by the linear projecting portions 7 a and 7 b extended by a specific distance toward upstream side from the downstream side end of the partition rib portion 2 b .
  • the linear projecting portions 7 a and 7 b wave-shaped projecting portions are used to assemble together two tube plates having the same shape, the tube 1 can be manufactured more inexpensively.
  • heat exchanger tube of the invention is used in the water-cooled charge air cooler, this is not limitative but it can also be applied to other types of heat exchangers.
  • JPA JPA No. 2012-239052 filed on Dec. 30, 2012 and thus the whole thereof is used herein by citation. Also, all references cited herein are contained herein as a whole.

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  • 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)

Abstract

A heat exchanger tube which, while preventing the increased flow resistance when the medium flows, can enhance the heat radiation performance, is provided. The heat exchanger tube 1 includes an upstream side linear flow path part 4A and a downstream side linear flow path part 4B connecting an entrance part 2 and exist part 3 to each other and enabling the medium to flow therethrough, wherein at least one of the upstream side flow path part 4A and downstream side flow path part 4B includes, within the flow path of the medium, wave-shaped portions 5 a, 5 b, 5 c, 5 d extending in the longitudinal direction of the tube and continuing with each other for guiding the medium.

Description

    TECHNICAL FIELD
  • The invention relates to a heat exchanger tube.
    • BACKGROUND ART
  • Conventionally, there are known heat exchanger tubes which are disclosed in the patent documents 1 and 2.
  • Such conventional heat exchanger tubes respectively include a tube member the two outsides of which are formed of beads except for the entrance and exit parts thereof and the central portion of which has a partition bead and a flow path enabling a medium to flow in a U-like manner therethrough. The path has a large number of projecting portions projecting inward in order to stir the flowing medium for enhancing heat radiation performance. Two tube plates having such structure are assembled together to form the tube.
    • RELATED DOCUMENTS Patent Documents
  • Patent Document 1: JP-A-H02-169127
  • Patent Document 2: WO 1983-04090 A1
    • SUMMARY OF THE INVENTION Problems that the Invention is to Solve
  • When a large number of projecting portions are arranged within the flow path, although the heat radiation performance is enhanced, the flow resistance increases.
  • The invention aims at solving the above problem and thus it is an object of the invention to provide a heat exchanger tube which, while preventing the increased flow resistance when the medium flows, can enhance the heat radiation performance.
    • Means for Solving the Problems
  • In attaining the above object, the heat exchanger tube of the invention comprises: an entrance part for a medium; an exit part for the medium; and, an upstream side linear flow path part and a downstream side linear flow path part connecting the entrance and exist parts to each other and enabling the medium to flow therethrough, wherein at least one of the upstream and downstream side flow path parts includes, in the flow path of the medium, wave-shaped portions extending in the longitudinal direction of the tube and continuing with each other for guiding the medium.
    • Advantages of the Invention
  • According to the heat exchanger tube of the invention, due to provision of the wave-shaped portions, when the medium flows, the flow resistance can be restricted and the stirring of the medium by the wave-shaped portions can enhance the heat radiation performance.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a section view of a heat exchanger tube according to an embodiment 1 of the invention.
  • FIG. 2 is a section view of a heat exchanger tube according to an embodiment 2 of the invention.
  • FIG. 3 is section view of the heat exchanger tube according to the embodiment 2, taken along the S3-S3 line of FIG. 2.
  • FIG. 4 is section view of the heat exchanger tube according to the embodiment 2, taken along the S4-S4 line of FIG. 2.
    •  MODES FOR CARRYING OUT THE INVENTION
  • Description is given below specifically of the mode for carrying out the invention with reference to the embodiments shown in the drawings.
    • Embodiment 1
  • Firstly, description is given of the whole structure of the heat exchanger tube of the embodiment 1.
  • As shown in FIG. 1, the heat exchanger tube 1 of the embodiment 1 is used in a water-cooling type charge air cooler for cooling the compressed air of a charger (turbocharger or supercharger) attached to an internal combustion engine.
  • The heat exchanger tube 1 is produced by assembling together two half-divided tube plates.
  • The tube 1 includes an outer peripheral rib portion 1 a which projects inward in the thickness direction (height direction) thereof along the outer periphery thereof except for the entrance part 2 and exit part 3 thereof.
  • Also, the tube 1 includes a partition rib portion (corresponding to a partition portion) 1 b formed at the central position in the width direction (vertical direction in FIG. 1) of the tube 1 and extending toward the longitudinal direction (horizontal direction in FIG. 1) of the tube from between the entrance part 2 and exist part 3 disposed on one end side of the tube 1. The rib portion 1 b extends up to the vicinity of a U-turn flow path part 4C (which is described later) on the other end side of the tube 1. The rib portion 1 b separates the tube 1 into two areas, that is, an upstream side linear flow path part 4A and a downstream side linear flow path part 4B.
  • The downstream side end of the upstream side linear flow path part 4A and the upstream side end of the downstream side linear flow path part 4 b are allowed to communicate with each other on the other end side of the tube 1 by the U-turn flow path part 4C.
  • Meanwhile, the entrance part 2 and exit part 3 are arranged side by side in the width direction of the tube 1. A parallel circuit with the cooling water of the engine used as the medium or a portion of the cooling water of the engine introduced therein, or an independent circuit (for example, a cooling water circuit for a charger-air-cooler) different from the cooling water of the engine are allowed to enter and leave the entrance part 2 and exit part 3 through the penetration holes thereof. The entrance part 2 is connected to the upstream side end of the upstream side linear flow path part 4A continuously therewith, while the exit part 3 is connected to the downstream side end of the downstream side linear flow path part 4B continuously therewith.
  • The upstream side linear flow path part 4A includes three upstream side flow paths 4A1, 4A2 and 4A3 respectively between the outer peripheral rib portion 1 a existing on the upper side of FIG. 1 and partition rib portion 1 b. The upstream side flow paths 4A1, 4A2 and 4A3 respectively include wave-shaped multiple projecting sections 5 a, 5 b which project side by side inward in the thickness direction (on this side in FIG. 1) between the outer peripheral rib portion 1 a and partition rib portion 1 b and are wave-formed when viewed from above the thickness direction.
  • Similarly, the downstream side linear flow path part 4B includes three downstream side flow paths 4B1, 4B2 and 4B3 respectively between the outer peripheral rib portion 1 a existing on the lower side of FIG. 1 and partition rib portion 1 b. The downstream side flow paths 4B1, 4B2 and 4B3 respectively include wave-shaped multiple projecting portions 5 c, 5 d which project side by side inward in the thickness direction between the outer peripheral rib portion 1 a and partition rib portion 1 b and are wave-formed when viewed from above the thickness direction.
  • Here, the wave-shaped projecting portions 5 a, 5 b, 5 c, 5 d correspond to the wave-shaped portions of the invention.
  • On the other hand, the U-turn path part 4C includes multiple arc-shaped projecting portions 6 a, 6 b which are formed inside the outer peripheral rib portion 1 a on the other end side of the tube 1, project inward in the thickness direction and are arc-shaped when viewed from above the thickness direction. Here, the curvature of the arc-shaped projecting portion 6 a is set larger than that of the arc-shaped projecting portion 6 b.
  • Therefore, in the U-turn path part 4C, between the outer peripheral rib portion 1 a and the outside arc-shaped projecting portion 6 a, between the outside arc-shaped projecting portion 6 a and inside arc-shaped projecting portion 6 b, and between the inside arc-shaped projecting portion 6 b and the other end side end of the partition rib portion 1 b, there are formed a total of three U-turn flow paths 4C1, 4C2 and 4C3 respectively. The curvatures of the U-turn flow paths 4C1, 4C2 and 4C3 are set such that the inflow direction and outflow direction of the medium can be changed 180° from each other.
  • In this case, the two ends of the outside arc-shaped projecting portion 6 a respectively continue with the downstream side end of the wave-shaped projecting portion 5 a and the upstream side end of the wave-shaped projecting portion 5 d. This enables the medium to flow through the entrance part 2, outside upstream side flow path 4A1, outside U-turn flow path 4C1, outside downstream side flow path 4B1 and exit part 3.
  • Also, the two ends of the inside arc-shaped projecting portion 6 b respectively continue with the downstream side end of the wave-shaped projecting portion 5 b and the upstream side end of the wave-shaped projecting portion 5 c. This enables the medium to flow through the entrance part 2, central upstream side flow path 4A2, central U-turn flow path 4C2, central downstream side flow path 4B2 and exit part 4, and also through the entrance part 2, inside upstream side flow path 4A3, inside U-turn flow path 4C3, outside downstream side flow path 4B3 and exit part 3.
  • Here, the upstream side end of the outside arc-shaped projecting portion 6 a and the downstream side end of the wave-shaped projecting portion 5 a, and the upstream side end of the inside arc-shaped projecting portion 6 b and the downstream side end of the wave-shaped projecting portion 5 b are connected to each other respectively by linear projecting portions 7 a and 7 b which are respectively extended by a specific distance toward upstream from the downstream side end of the partition rib portion 1 b.
  • Although not shown, there is further prepared a third tube plate by molding. The third tube plate includes wave-shaped projecting portions and arc-shaped projecting portions having the shapes and positions of images reflected by mirrors which are so parallel arranged upwardly of FIG. 1 as to face FIG. 1.
  • Then, the tube plate having the shape of FIG. 1 and the third tube plate are assembled together. In this assembled state, the wave-shaped projecting portions, arc-shaped projecting portions and linear projecting portions of these tube plates are opposed to each other at the same positions.
  • In this state, the wave-shaped projecting portions, arc-shaped projecting portions, linear projecting portions, outer peripheral rib portions and partition rib portions of these tube plates are fixed together by brazing or the like, thereby providing the tube 1.
  • In the above-structured heat exchanger tube, the cooling water supplied from the entrance part 2 flows meandering through the three upstream side flow paths 4A1, 4A2 and 4A3 within the upstream side linear path portion 4A under the control of the wave-shaped projecting portions 5 a, 5 b, and flows into the U-turn flow path part 4C along the linear projecting portions 7 a, 7 b.
  • In the U-turn flow path part 4C, the flow direction of the cooling water is gradually changed 180° within the three arc-shaped U-turn flow paths 4C1, 4C2 and 4 C 3 along the arc-shaped projecting portions 6 a and 6 b, thereby guiding the cooling water to the three downstream side flow paths 4B1, 4B2 and 4B3.
  • Thereafter, the medium advances meandering within the three wave-shaped downstream side flow paths 4B1, 4B2 and 4B3 under the control of the wave-shaped projecting portions 5 c and 5 d, and flows out from the exit part 3.
  • Thus, the cooling water, while being stirred as in conventional dimples or the like, flows within the tube. The wave-like meandering of the cooling water can restrict an increase in the flow resistance and can secure the heat radiation performance. Also, as described above, in the U-turn flow path part as well, the direction of the cooling water is gradually changed. This can reduce the possibility that the cooling water can strike strongly at the end of the tube and thus can be damaged by erosion.
  • Meanwhile, the high-temperature compressed air flowing outside the tube passes the tube exchanges its heat with the cooling water, whereby it is cooled. After fuel is blown into this air, the mixture thereof is combusted in the combustion room of the engine.
  • As described above, the heat exchanger tube of the embodiment 1 can provide the following effects.
  • That is, since the wave-shaped projecting portions 5 a, 5 b, 5 c, 5 d are formed in the upstream side and downstream side linear flow path parts 4A and 4B, the flow resistance when the cooling water flows can be restricted, and also since the cooling water flows along the wave-shaped projecting portions 5 a, 5 b, 5 c, 5 d, the heat radiation performance can be enhanced.
  • Since the tube 1 is manufactured by assembling together the two half-divided tube plates, the tube 1 can be manufactured easily and inexpensively.
  • Also, in this case, the wave-shaped projecting portions 5 a, 5 b, 5 c, 5 d of the two tube plates are arranged to provide the same positions and the wave-shaped projecting portions 5 a, 5 b, 5 c, 5 d are continuously opposed to each other, thereby enabling the cooling water to meander.
  • Also, the ends of the arc-shaped projecting portions 6 a, 6 b of the U-turn flow path part 4C are arranged to straddle the downstream side end of the partition rib part 1 b, thereby enabling restriction of disturbance of the cooling water here. That is, the cooling water is enabled to flow smoothly between the linear flow path parts (between the upstream side and downstream side linear flow path parts 4A and 4B), whereby the flow resistance can be restricted.
    • Embodiment 2
  • FIG. 2 shows a heat exchanger tube 1 of an embodiment 2. In the heat exchanger tube 1 of the embodiment 2, there are prepared two tube plates having the same structure of the embodiment 1.
  • One tube plate is inverted and combined with the other to provide the tube 1.
  • In this case, the mirror-reflected third tube plate of the embodiment 1 is not used. Thus, the wave-shaped projecting portions 5 a, 5 b, 5 c, 5 d of the upstream side and downstream side linear flow path parts 4A, 4B and the arc-shaped projecting portions 6 a, 6 b respectively formed in the other tube are disposed as shown by broken lines in FIG. 2.
  • In this case, in the wave-shaped projecting portions 5 a, 5 b, 5 c, 5 d and linear projecting portions 7 a, 7 b of the two tube plates, only the partial sections thereof are opposed to each other, whereas the remaining sections are shifted from each other in the width direction of the tube 1. Meanwhile, the arc-shaped projecting portions 6 a and 6 b of the U-turn flow path part 4C are situated at the same positions and are continuously opposed to each other.
  • That is, the wave-shaped projecting portions 5 a, 5 b and wave-shaped projecting portions 5 c, 5 d, which are paired wave-shaped portions, are alternately arranged side by side. Thus, in the wave-shaped portions, only the partial sections of the wave-shaped projecting sections 5 a, 5 b constituted of the paired wave-shaped portions (or, the wave-shaped projecting portions 5 c, 5 d) cross each other, while only such partial sections are opposed to each other.
  • The remaining structures are similar to the embodiment 1.
  • FIG. 3 is a transverse section view taken along the S3-S3 line passing the above-mentioned mutually shifted sections, and FIG. 4 is a section view taken along the S4-S4 line passing the above-mentioned mutually opposed sections.
  • As can be understood from these section shapes, unlike the prior art using a large number of dimples, the cooling water is prevented from being stirred greatly.
  • In the heat exchanger tube 1 of the embodiment 2, since the stirring is easier than in the embodiment 1, the heat radiation performance is enhanced. In this case, the flow resistance increases slightly when compared with the embodiment 1.
  • However, since, as the two tube plates to be assembled, the same tube plate can be used, the tube 1 can be manufactured more inexpensively than the embodiment 1.
  • Although the invention has been discussed heretofore with reference to the above embodiments, the invention is not limited to these embodiments but can be changed in design or the like without departing from the subject matter thereof.
  • For example, in the embodiment 1, the wave-shaped projecting portions 5 a, 5 b are formed in both of the upstream side and downstream side linear flow path parts 4A and 4B. However, the portions may also be formed only in one of the two parts.
  • Also, the medium may also be guided using inner fins instead of the wave-shaped projecting portions 5 a, 5 b and arc-shaped projecting portions 6 a, 6 b. Use of the inner fins can enhance the setting freedom of the shape of the wave-shaped portions.
  • Also, the respective arc-shaped and wave-shaped projections are connected to each other by the linear projecting portions 7 a and 7 b extended by a specific distance toward upstream side from the downstream side end of the partition rib portion 2 b. However, when, instead of the linear projecting portions 7 a and 7 b, wave-shaped projecting portions are used to assemble together two tube plates having the same shape, the tube 1 can be manufactured more inexpensively.
  • Although the heat exchanger tube of the invention is used in the water-cooled charge air cooler, this is not limitative but it can also be applied to other types of heat exchangers.
  • Here, the present application is based on JPA (JPA No. 2012-239052) filed on Dec. 30, 2012 and thus the whole thereof is used herein by citation. Also, all references cited herein are contained herein as a whole.
    • DESCRIPTION OF REFERENCE NUMERALS AND SIGNS
    • 1: tube (heat exchanger tube)
    • 1 a: outer peripheral rib part
    • 1 b: partition rib part (partition part)
    • 2: entrance part
    • 3: exit part
    • 4A: upstream side linear flow path part
    • 4B: downstream side linear flow path part
    • 4C: U-turn flow path part
    • 4A1, 4A2, 4A3: upstream side flow path
    • 4B1, 4B2, 4B3: downstream side flow path
    • 4C1, 4C2, 4C3: U-turn flow path
    • 5 a, 5 b, 5 c, 5 d: wave-shaped projecting portion
    • 6 a, 6 b: arc-shaped projecting portion
    • 7 a, 7 b: linear projecting portion

Claims (12)

1. A heat exchanger tube comprising:
an entrance part for a medium;
an exit part for the medium; and
an upstream side linear flow path part and a downstream side linear flow path part connecting the entrance and exist parts to each other and enabling the medium to flow therethrough, wherein:
at least one of the upstream side and downstream side flow path parts includes, within the flow path of the medium, wave-shaped portions extending in the longitudinal direction of the tube and continuing with each other for guiding the medium; and
the medium flows flow path parts defined by the wave-shaped portions and located next to each other.
2. The heat exchanger tube according to claim 1, wherein
the wave-shaped portions are projecting portions projecting inwardly of the tube.
3. The heat exchanger tube according to claim 2, wherein
the wave-shaped projecting portions are inner fins.
4. The heat exchanger tube according to claim 1, wherein
the entrance and exit parts are arranged on one end side of the tube, the tube includes, on the other end side thereof, a U-turn flow path part for connecting the upstream side and downstream side linear flow path parts to each other, and the U-turn path part includes an arc-shaped projecting portion projecting inwardly of the tube and continuing with the wave-shaped portion formed at least in one of the upstream side and downstream side linear flow path parts.
5. The heat exchanger tube according to claim 1, wherein
the wave-shaped portion is constituted of multiple wave-shaped portions arranged in the thickness direction of the tube.
6. The heat exchanger tube according to claim 5, wherein
a pair of the wave-shaped portions are so arranged as to be situated at the same position and such wave-shaped portions are opposed to each other continuously.
7. The heat exchanger tube according to claim 5, wherein
only the partial sections of the paired wave-shaped portions cross each other and only such partial sections are opposed to each other.
8. The heat exchanger tube according to claim 5, wherein
the paired wave-shaped portions are parallel arranged alternately.
9. The heat exchanger tube according to claim 4, wherein
the end of a U-turn portion of the U-turn flow path part straddles inwardly the end of a partition part for separating the upstream side and downstream side flow path parts from each other.
10. The heat exchanger tube according to claim 1, wherein:
the medium flowing within the tube is cooling water; and
the heat exchanger tube is the tube of a water-cooling type charge air cooler for allowing the cooling water and compressed air flowing outside the tube to exchange heat with each other to thereby cool the compressed air.
11. The heat exchanger tube according to claim 5, wherein
phases corresponding to shapes of the wave-shaped portions, located next to each other in the thickness direction of the tube, are offset from each other.
12. The heat exchanger tube according to claim 5, wherein
phases corresponding to shapes of the wave-shaped portions, located next to each other in the thickness direction of the tube, have an opposite-phase relation with each other.
US14/438,893 2012-10-30 2013-10-07 Heat exchanger tube Abandoned US20150300755A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2012-239052 2012-10-30
JP2012239052A JP5921413B2 (en) 2012-10-30 2012-10-30 Tube for heat exchanger
PCT/JP2013/077244 WO2014069175A1 (en) 2012-10-30 2013-10-07 Heat exchanger tube

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US (1) US20150300755A1 (en)
JP (1) JP5921413B2 (en)
CN (1) CN104769381A (en)
DE (1) DE112013005192T5 (en)
WO (1) WO2014069175A1 (en)

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WO2014069175A1 (en) 2014-05-08
JP5921413B2 (en) 2016-05-24
DE112013005192T5 (en) 2015-08-27
CN104769381A (en) 2015-07-08

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Effective date: 20150420

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