CN115451748A - Flat pipe and heat exchanger - Google Patents

Flat pipe and heat exchanger Download PDF

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Publication number
CN115451748A
CN115451748A CN202110645778.8A CN202110645778A CN115451748A CN 115451748 A CN115451748 A CN 115451748A CN 202110645778 A CN202110645778 A CN 202110645778A CN 115451748 A CN115451748 A CN 115451748A
Authority
CN
China
Prior art keywords
bending
flat
flat pipe
bending part
section
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.)
Pending
Application number
CN202110645778.8A
Other languages
Chinese (zh)
Inventor
魏文建
兰兆忠
梁新宇
王冠军
丁二刚
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.)
Zhejiang Dunan Thermal Technology Co Ltd
Original Assignee
Zhejiang Dunan Thermal Technology Co Ltd
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 Zhejiang Dunan Thermal Technology Co Ltd filed Critical Zhejiang Dunan Thermal Technology Co Ltd
Priority to CN202110645778.8A priority Critical patent/CN115451748A/en
Priority to PCT/CN2022/095334 priority patent/WO2022257776A1/en
Priority to EP22819374.4A priority patent/EP4354067A1/en
Priority to KR1020237044142A priority patent/KR20240012500A/en
Priority to JP2023566979A priority patent/JP2024520278A/en
Publication of CN115451748A publication Critical patent/CN115451748A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F28D1/0475—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 single U-bend
    • F28D1/0476—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 single U-bend 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • 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
    • F28D1/0408—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids
    • F28D1/0426—Multi-circuit heat exchangers, e.g. integrating different heat exchange sections in the same unit or heat exchangers for more than two fluids with units having particular arrangement relative to the large body of fluid, e.g. with interleaved units or with adjacent heat exchange units in common air flow or with units extending at an angle to each other or with units arranged around a central element
    • F28D1/0443—Combination of units extending one beside or one above the other
    • 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
    • F28D7/0008—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 for one medium being in heat conductive contact with the conduits for the other medium
    • F28D7/0025—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 for one medium being in heat conductive contact with the conduits for the other medium the conduits for one medium or the conduits for both media being flat tubes or arrays of tubes
    • F28D7/0033—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 for one medium being in heat conductive contact with the conduits for the other medium the conduits for one medium or the conduits for both media being flat tubes or arrays of tubes the conduits for one medium or the conduits for both media being bent
    • 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
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • 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
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • 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
    • F28F1/24—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 transversely
    • 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
    • F28D1/053—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 straight
    • F28D1/0535—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 straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel 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
    • F28F1/10—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
    • F28F1/126—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 consisting of zig-zag shaped fins

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)

Abstract

The invention provides a flat tube and a heat exchanger, wherein a bending section is formed in the middle of the flat tube, two straight sections are formed in the area of the flat tube outside the bending section, the bending section comprises a bending part and two torsion parts, and two ends of each torsion part are respectively connected with one end of the bending section and one straight section; the bending part is bent around an axis parallel to the thickness direction of the flat pipe, the minimum curvature radius of the inner side of the bending part is RNmin, the thickness of the flat pipe is t, and t is more than RNmin and less than 5t. In this scheme, can accomplish the deformation of bending under the less condition that the minimum curvature radius that will bend the portion inboard sets up, can reduce the length of the section of bending like this to increased the length of straight section, and then improved the heat transfer performance of flat pipe and applied this flat pipe's heat exchanger.

Description

Flat pipe and heat exchanger
Technical Field
The invention relates to the technical field of heat exchangers, in particular to a flat pipe and a heat exchanger.
Background
For the heat exchanger adopting the flat pipe, in order to increase the heat exchange area and simplify the structure, the flat pipe is bent in some heat exchangers to form a double-row structure. The length of the bending section of the flat tube in the existing heat exchanger is longer, so that the length of the non-bending section is relatively shortened, and the area for arranging the fins is smaller, thereby influencing the heat exchange performance of the heat exchanger.
Disclosure of Invention
The invention provides a flat pipe and a heat exchanger, which aim to solve the problem of poor heat exchange performance of the conventional heat exchanger.
In order to solve the above problems, according to an aspect of the present invention, a bending section is formed in the middle of the flat tube, two straight sections are formed in a region of the flat tube outside the bending section, the bending section includes a bending portion and two torsion portions, and two ends of each torsion portion are respectively connected to one end of the bending section and one straight section; the bending part is bent around an axis parallel to the thickness direction of the flat pipe, the minimum curvature radius of the inner side of the bending part is RNmin, the thickness of the flat pipe is t, and t is more than RNmin and less than 5t.
Furthermore, the maximum curvature radius of the inner side of the bending part is RNmax, and t is less than RNmax and less than 5t.
Furthermore, the minimum curvature radius of the outer side of the bending part is RWMin, and t is more than RWMin and less than 5t.
Furthermore, the maximum curvature radius of the outer side of the bending part is RWMax, and t is more than RWMax and less than 5t.
Further, RNmin is 4.5t, 4t or 3t.
Furthermore, the maximum curvature radius of the inner side of the bending part is RNmax, and RNmax is more than or equal to 5t; the minimum curvature radius of the outer side of the bending part is Rwmin which is not less than 5t.
Furthermore, the joint of the two torsion portions and the bending portion is provided with a preset tangent line, an included angle between the two preset tangent lines is theta, an included angle between the two straight sections is alpha, and alpha is larger than theta.
Further, alpha is less than or equal to 90 degrees.
Further, the flat pipe is provided with a preset symmetrical plane, the symmetrical plane divides the bending part into two symmetrical parts, the two torsion parts are symmetrically arranged relative to the symmetrical plane, and the two straight sections are symmetrically arranged relative to the symmetrical plane.
According to another aspect of the invention, a heat exchanger is provided, which comprises a plurality of flat tubes arranged side by side, and a fin is arranged between straight sections of two adjacent flat tubes.
The technical scheme of the invention is applied, a bending section is formed in the middle of the flat tube, two straight sections are formed in the area of the flat tube outside the bending section, the bending section comprises a bending part and two torsion parts, and two ends of each torsion part are respectively connected with one end of the bending section and one straight section; the bending part is bent around an axis parallel to the thickness direction of the flat pipe, the minimum curvature radius of the inner side of the bending part is RNmin, the thickness of the flat pipe is t, and t is more than RNmin and less than 5t. In this scheme, can accomplish the deformation of bending under the less condition that the minimum curvature radius that will bend the portion inboard sets up, can reduce the length of the section of bending like this to increased the length of straight section, and then improved the heat transfer performance of flat pipe and applied this flat pipe's heat exchanger.
The bending radius of the conventional bending heat exchanger is large, the bending angle is limited, especially the angle lower limit, the bending radius of the conventional micro-channel heat exchanger is generally required to be larger than 5t, and therefore the strength and the corrosion resistance of the bending section of the flat pipe are met. This scheme discloses a less radial flat tube structure of bending to through experimental verification, when satisfying flat tub intensity and corrosion resistance requirement, can further effectively reduce the length of bending section, increase the effective length of fin relatively. That is, the ratio of the effective heat exchange area to the area of the entire heat exchanger becomes large. Meanwhile, the straight line segment connected with the bent segment of the flat pipe is properly folded outwards in the opposite direction, so that the height of the heat exchanger is reduced, the bottom of the heat exchanger is properly opened, the overall height of the heat exchanger with the flat pipe structure can be reduced, the windward area of the heat exchanger is relatively increased, and the heat exchange performance is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a front view of a flat tube according to an exemplary embodiment of the present disclosure;
fig. 2 shows a perspective view of the flat tube from fig. 1;
fig. 3 shows a side view of the flat tube from fig. 1;
FIG. 4 is a schematic diagram of a heat exchanger provided by an embodiment of the present invention;
fig. 5 shows a schematic view of the heat exchanger in fig. 4 before bending the flat tubes.
Wherein the figures include the following reference numerals:
10. bending sections; 11. a bending part; 12. a torsion portion; 13. presetting a tangent line; 20. a straight section; 30. and a fin.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
As shown in fig. 1 to 3, an embodiment of the present invention provides a flat tube, where a bending section 10 is formed in the middle of the flat tube, two straight sections 20 are formed in an area of the flat tube outside the bending section 10, the bending section 10 includes a bending portion 11 and two torsion portions 12, and two ends of each torsion portion 12 are respectively connected to one end of the bending section 10 and one straight section 20; the bending part 11 is bent around an axis parallel to the thickness direction of the flat pipe, the minimum curvature radius of the inner side of the bending part 11 is RNmin, the thickness of the flat pipe is t, and t is more than RNmin and less than 5t. Wherein, two width direction's of two straight sections 20 one sides of flat pipe surface is located the coplanar, and two width direction's of opposite side surface is located another plane the same, is favorable to using arranging and the arranging of fin of a plurality of flat pipes in the heat transfer of this flat pipe like this. The outside radius of curvature of the bent portion 11 is larger than the inside radius of curvature.
In this scheme, the minimum radius of curvature that will bend the portion 11 inboard sets up to t < RNmin < 5t, can accomplish the deformation of bending under the less condition of minimum radius of curvature like this, can reduce the length of the section 10 of bending of flat pipe like this to the length of straight section 20 has been increased, and then has improved the heat transfer performance of flat pipe and the heat exchanger of using this flat pipe.
Specifically, RNmin may be set to a size of 4.5t, 4t, or 3t, etc.
In another embodiment, t < RNmin < 5t, the maximum radius of curvature inside bend 11 is RNmax, t < RNmax < 5t. Therefore, the maximum curvature radius of the inner side of the bending part 11 is ensured to be smaller, so that the length of the bending section 10 occupying the flat pipe is reduced, and the length of the straight section 20 is increased. Fins can be arranged on the straight section 20, so that the area for arranging the fins is increased, and the heat exchange performance of the heat exchanger is improved.
In another embodiment, t < RNmin < 5t, the minimum radius of curvature of the outer side of the bend 11 is Rwmin, and t < Rwmin < 5t. Specifically, t is more than RNmin and less than 4t, and 2t is more than Rwmin and less than 5t. This reduces the curvature of the bend 11 and thus the bend can be formed with a smaller bend radius, so that the length of the bend 10 can be reduced compared to the prior art.
Alternatively, in another embodiment, t < RNmin < 5t, the maximum radius of curvature of the outer side of the bend 11 is RWMax, and t < RWMax < 5t. Specifically, t < RNmax < 4t,2t < RWMax < 5t. Therefore, the length of the bending section 10 can be further reduced on the premise of meeting the requirements of strength and process.
Or in another embodiment, t is less than RNmin and less than 5t, the maximum curvature radius of the inner side of the bending part 11 is RNmax, and RNmax is more than or equal to 5t; the minimum curvature radius of the outer side of the bending part 11 is Rwmin which is not less than 5t. So that the bent portion 11 is easily bent.
In the above embodiment, the joints of the two torsion portions 12 and the bending portion 11 respectively have the predetermined tangent lines 13, the included angle between the two predetermined tangent lines 13 is θ, and the included angle between the two straight sections 20 is α, where α > θ. The bending part 11 is formed by bending, and then the two flat sections 20 of the flat pipe are folded outwards, so that the height of the flat pipe is reduced, and the flat pipe is convenient to arrange in a limited space. Moreover, the bottom of the flat pipe is properly opened, so that the overall height of the heat exchanger with the flat pipe structure can be reduced, the windward area of the heat exchanger is relatively increased, and the heat exchange performance is improved.
Specifically, α is ≦ 90. For example, α is set to 30 ° or 60 °.
Further, the flat tube has a preset symmetry plane, the symmetry plane divides the bending portion 11 into two symmetrical parts, the two torsion portions 12 are symmetrically arranged relative to the symmetry plane, and the two straight portions 20 are symmetrically arranged relative to the symmetry plane. The flat pipe molding and the arrangement of a plurality of flat pipes are convenient.
As shown in fig. 4 and 5, another embodiment of the present invention provides a heat exchanger, which includes a plurality of flat tubes arranged side by side, and a fin 30 is arranged between the flat sections 20 of two adjacent flat tubes. In the scheme, the minimum curvature radius of the inner side of the bending part 11 is set to be t < RNmin < 5t, so that the bending deformation can be completed under the condition that the minimum curvature radius is smaller, the length of the bending section 10 of the flat pipe can be reduced, the length of the straight section 20 is increased, and the heat exchange performance of the flat pipe and the heat exchanger using the flat pipe is improved.
The bending radius of the conventional bending heat exchanger is large, the bending angle is limited, especially the angle lower limit, the bending radius of the conventional micro-channel heat exchanger is generally required to be larger than 5t, and therefore the strength and the corrosion resistance of the bending section of the flat pipe are met. This scheme discloses a less radial flat tube structure of bending to through experimental verification, when satisfying flat tub intensity and corrosion resistance requirement, can further effectively reduce the length of bending section, increase the effective length of fin relatively. That is, the ratio of the effective heat exchange area to the area of the entire heat exchanger becomes large. Meanwhile, the straight line section connected with the bending section of the flat pipe is properly folded outwards in the opposite direction, so that the height of the heat exchanger is reduced, the bottom of the heat exchanger is properly opened, the overall height of the heat exchanger with the flat pipe structure can be reduced, the windward area of the heat exchanger is relatively increased, and the heat exchange performance is improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A flat pipe is characterized in that the flat pipe,
bending sections (10) are formed in the middle of the flat tubes, two straight sections (20) are formed in the regions, located outside the bending sections (10), of the flat tubes, each bending section (10) comprises a bending part (11) and two torsion parts (12), and two ends of each torsion part (12) are connected with one end of each bending section (10) and one straight section (20) respectively;
the bending part (11) is bent around an axis parallel to the thickness direction of the flat pipe, the minimum curvature radius of the inner side of the bending part (11) is RNmin, the thickness of the flat pipe is t, and t is more than RNmin and less than 5t.
2. Flat tube according to claim 1,
the maximum curvature radius of the inner side of the bending part (11) is RNmax, and t is more than RNmax and less than 5t.
3. Flat tube according to claim 1,
the minimum curvature radius of the outer side of the bending part (11) is Rwmin, and t is more than Rwmin and less than 5t.
4. Flat tube according to claim 1,
the maximum curvature radius of the outer side of the bending part (11) is RWMax, and t is more than RWMax and less than 5t.
5. Flat tube according to claim 1, characterized in that RNmin is 4.5t, 4t or 3t.
6. Flat tube according to claim 1,
the maximum curvature radius of the inner side of the bending part (11) is RNmax, and RNmax is more than or equal to 5t;
the minimum curvature radius of the outer side of the bending part (11) is RWin, and RWin is not less than 5t.
7. The flat tube according to claim 1, wherein a predetermined tangent (13) is provided at the junction between the two torsion portions (12) and the bending portion (11), an included angle between the two predetermined tangents (13) is θ, and an included angle between the two straight sections (20) is α, where α > θ.
8. Flat tube according to claim 7, characterised in that α ≦ 90 °.
9. Flat tube according to claim 1, characterised in that it has a predetermined plane of symmetry which divides the bend (11) into two symmetrical parts, two torsion portions (12) being arranged symmetrically with respect to the plane of symmetry, and two straight portions (20) being arranged symmetrically with respect to the plane of symmetry.
10. The heat exchanger is characterized by comprising a plurality of flat pipes arranged side by side, wherein a fin (30) is arranged between straight sections (20) of the adjacent two flat pipes.
CN202110645778.8A 2021-06-09 2021-06-09 Flat pipe and heat exchanger Pending CN115451748A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202110645778.8A CN115451748A (en) 2021-06-09 2021-06-09 Flat pipe and heat exchanger
PCT/CN2022/095334 WO2022257776A1 (en) 2021-06-09 2022-05-26 Flat tube and heat exchanger
EP22819374.4A EP4354067A1 (en) 2021-06-09 2022-05-26 Flat tube and heat exchanger
KR1020237044142A KR20240012500A (en) 2021-06-09 2022-05-26 Flat tubes and heat exchangers
JP2023566979A JP2024520278A (en) 2021-06-09 2022-05-26 Flat tubes and heat exchangers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110645778.8A CN115451748A (en) 2021-06-09 2021-06-09 Flat pipe and heat exchanger

Publications (1)

Publication Number Publication Date
CN115451748A true CN115451748A (en) 2022-12-09

Family

ID=84294977

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110645778.8A Pending CN115451748A (en) 2021-06-09 2021-06-09 Flat pipe and heat exchanger

Country Status (5)

Country Link
EP (1) EP4354067A1 (en)
JP (1) JP2024520278A (en)
KR (1) KR20240012500A (en)
CN (1) CN115451748A (en)
WO (1) WO2022257776A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3305460B2 (en) * 1993-11-24 2002-07-22 昭和電工株式会社 Heat exchanger
JP2009216315A (en) * 2008-03-11 2009-09-24 Showa Denko Kk Heat exchanger
JP5900564B2 (en) * 2013-09-11 2016-04-06 ダイキン工業株式会社 Heat exchanger, air conditioner, and heat exchanger manufacturing method
US10247482B2 (en) * 2013-12-13 2019-04-02 Hangzhou Sanhua Research Institute Co., Ltd. Bent heat exchanger and method for bending the heat exchanger

Also Published As

Publication number Publication date
WO2022257776A1 (en) 2022-12-15
EP4354067A1 (en) 2024-04-17
JP2024520278A (en) 2024-05-24
KR20240012500A (en) 2024-01-29

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