WO2022257776A1 - 扁管及换热器 - Google Patents

扁管及换热器 Download PDF

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Publication number
WO2022257776A1
WO2022257776A1 PCT/CN2022/095334 CN2022095334W WO2022257776A1 WO 2022257776 A1 WO2022257776 A1 WO 2022257776A1 CN 2022095334 W CN2022095334 W CN 2022095334W WO 2022257776 A1 WO2022257776 A1 WO 2022257776A1
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WO
WIPO (PCT)
Prior art keywords
flat tube
bent
section
heat exchanger
bending
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.)
Ceased
Application number
PCT/CN2022/095334
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English (en)
French (fr)
Inventor
冯忠波
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 Artificial Environment Co Ltd
Original Assignee
Zhejiang Dunan Artificial Environment 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 Artificial Environment Co Ltd filed Critical Zhejiang Dunan Artificial Environment Co Ltd
Priority to KR1020237044142A priority Critical patent/KR20240012500A/ko
Priority to EP22819374.4A priority patent/EP4354067B1/en
Priority to JP2023566979A priority patent/JP2024520278A/ja
Priority to US18/567,034 priority patent/US20240263891A1/en
Publication of WO2022257776A1 publication Critical patent/WO2022257776A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • 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
    • F28F1/04—Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
    • 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

Definitions

  • the present application relates to the technical field of heat exchangers, in particular, to a flat tube and a heat exchanger.
  • some heat exchangers bend the flat tubes to form a double-row structure.
  • the length of the bent section of the flat tube is relatively long, which relatively shortens the length of the non-bent section, so that the area where the fins are arranged is small, which affects the heat transfer performance of the heat exchanger.
  • the present application provides a flat tube and a heat exchanger to solve the problem of poor heat exchange performance of existing heat exchangers.
  • the present application provides a flat tube, the middle part of the flat tube forms a bent section, and the area of the flat tube outside the bent section forms two straight section, the bent section includes a bent section and two twisted sections, and the two ends of each twisted section are respectively connected to one end of the bent section and one straight section; wherein, the bent section The part is bent around an axis parallel to the thickness direction of the flat tube, the minimum radius of curvature inside the bent part is RNmin, the thickness of the flat tube is t, and t ⁇ RNmin ⁇ 5t.
  • the maximum curvature radius inside the bending portion is RNmax, t ⁇ RNmax ⁇ 5t.
  • the minimum radius of curvature outside the bent portion is RWmin, t ⁇ RWmin ⁇ 5t.
  • the maximum curvature radius outside the bent portion is RWmax, t ⁇ RWmax ⁇ 5t.
  • RNmin is 4.5t, 4t or 3t.
  • the maximum curvature radius inside the bending part is RNmax, RNmax ⁇ 5t; the minimum curvature radius outside the bending part is RWmin, RWmin ⁇ 5t.
  • junctions of the two twisted parts and the bent parts respectively have preset tangents
  • the angle between the two preset tangents is ⁇
  • the angle between the two straight sections The angle is ⁇ , where ⁇ > ⁇ .
  • the flat tube has a preset symmetry plane, the symmetry plane divides the bent part into two symmetrical parts, the two torsion parts are arranged symmetrically with respect to the symmetry plane, and the two The straight section is arranged symmetrically with respect to said plane of symmetry.
  • a heat exchanger is provided.
  • the heat exchanger includes a plurality of flat tubes arranged side by side, and fins are arranged between straight sections of two adjacent flat tubes.
  • a flat tube is provided.
  • the middle part of the flat tube forms a bent section, and the area of the flat tube outside the bent section forms two straight sections.
  • the bent section includes a bent part and two twisted sections.
  • the two ends of each torsion part are respectively connected to one end of the bending section and a straight section; wherein, the bending section is bent around an axis parallel to the thickness direction of the flat tube, and the minimum radius of curvature inside the bending section is RNmin,
  • the thickness of the flat tube is t, t ⁇ RNmin ⁇ 5t.
  • the bending deformation can be completed when the minimum radius of curvature inside the bending part is set relatively small, which can reduce the length of the bending section, thereby increasing the length of the straight section, thereby improving
  • the heat transfer performance of the flat tube and the heat exchanger using the flat tube is studied.
  • the bending radius of the conventional bending heat exchanger is large, and the bending angle is limited, especially the lower limit of the angle.
  • the bending radius of the conventional microchannel heat exchanger is generally required to be greater than 5t to meet the strength and corrosion resistance of the flat tube bending section .
  • This scheme discloses a flat tube structure with a smaller bending radius, and it has been verified by experiments that while meeting the requirements for the strength and corrosion resistance of the flat tube, the length of the bending section can be further effectively reduced, and the length of the effective section of the fin can be relatively increased . That is, the ratio of the effective heat exchange area to the area of the overall heat exchanger will become larger.
  • the straight section connected to the bent section of the flat tube is moderately folded outward in the opposite direction, so that the height of the heat exchanger is reduced, and the bottom is properly opened, which can reduce the overall height of the heat exchanger with this flat tube structure, and relatively increase Large heat exchanger frontal area, thus improving heat transfer performance.
  • Fig. 1 shows the front view of the flat tube provided by the embodiment of the application
  • Figure 2 shows a perspective view of the flat tube in Figure 1;
  • Figure 3 shows a side view of the flat tube in Figure 1;
  • Fig. 4 shows the structural representation of the heat exchanger provided by the embodiment of the present application
  • FIG. 5 shows a schematic view of the heat exchanger in FIG. 4 before the flat tubes are bent.
  • the embodiment of the present application provides a flat tube, the middle part of the flat tube forms a bent section 10, and the area outside the bent section 10 of the flat tube forms two straight sections 20, and the bent section
  • the bent section 10 includes a bent section 11 and two twisted sections 12, and the two ends of each twisted section 12 are respectively connected to one end of the bent section 10 and a straight section 20;
  • the axis in the thickness direction is bent, the minimum radius of curvature inside the bent portion 11 is RNmin, the thickness of the flat tube is t, and t ⁇ RNmin ⁇ 5t.
  • the two widthwise surfaces on one side of the two straight sections 20 of the flat tube are located on the same plane, and the two widthwise surfaces on the other side are located on the same other plane, which is beneficial to the replacement of the flat tube.
  • the arrangement of multiple flat tubes and the arrangement of fins in heat treatment are larger than the radius of curvature on the inside.
  • the minimum radius of curvature inside the bending part 11 is set to t ⁇ RNmin ⁇ 5t, so that the bending deformation can be completed when the minimum radius of curvature is relatively small, which can reduce the bending section 10 of the flat tube Therefore, the length of the straight section 20 is increased, thereby improving the heat exchange performance of the flat tube and the heat exchanger using the flat tube.
  • RNmin can be set to a size of 4.5t, 4t or 3t.
  • the maximum curvature radius inside the bending portion 11 is RNmax, and t ⁇ RNmax ⁇ 5t. This can ensure that the maximum radius of curvature inside the bent portion 11 is relatively small, so as to reduce the length of the flat tube occupied by the bent section 10 , thereby increasing the length of the straight section 20 . Fins can be arranged on the straight section 20, which increases the area where fins are arranged, thereby improving the heat exchange performance of the heat exchanger.
  • t ⁇ RNmin ⁇ 5t the minimum radius of curvature outside the bent portion 11 is RWmin, and t ⁇ RWmin ⁇ 5t. Specifically, t ⁇ RNmin ⁇ 4t, 2t ⁇ RWmin ⁇ 5t. In this way, the curvature of the bent portion 11 can be reduced, so that it can be bent and formed with a smaller bending radius, so that compared with the prior art, the length of the bent section 10 can be reduced.
  • t ⁇ RNmin ⁇ 5t the maximum curvature radius outside the bending portion 11 is RWmax, and t ⁇ RWmax ⁇ 5t. Specifically, t ⁇ RNmax ⁇ 4t, 2t ⁇ RWmax ⁇ 5t. In this way, the length of the bent section 10 can be further reduced on the premise of meeting the strength and process requirements.
  • the bent portion 11 is convenient for bending and forming.
  • the junctions of the two twisted parts 12 and the bent parts 11 have preset tangents 13 respectively, the angle between the two preset tangents 13 is ⁇ , and the angle between the two straight sections 20 The angle is ⁇ , where ⁇ > ⁇ . That is, after the bending part 11 is bent and formed, the two straight sections 20 of the flat tube are partially folded outward, which reduces the height of the flat tube and is convenient for arrangement in a limited space. Moreover, the proper opening of the bottom of the flat tube can reduce the overall height of the heat exchanger with this flat tube structure, and relatively increase the windward area of the heat exchanger, thereby improving the heat exchange performance.
  • ⁇ 90° For example, set ⁇ to 30° or 60°.
  • the flat tube has a preset symmetrical plane, and the symmetrical plane divides the bent part 11 into two symmetrical parts, the two twisted parts 12 are arranged symmetrically with respect to the symmetrical plane, and the two straight sections 20 are symmetrically facing each other. called settings. This facilitates the flat tube forming and the arrangement of several flat tubes.
  • the heat exchanger includes a plurality of flat tubes arranged side by side, and the straight sections 20 of two adjacent flat tubes are arranged There are fins 30 .
  • the minimum radius of curvature inside the bending part 11 is set to t ⁇ RNmin ⁇ 5t, so that the bending deformation can be completed when the minimum radius of curvature is relatively small, which can reduce the bending section 10 of the flat tube Therefore, the length of the straight section 20 is increased, thereby improving the heat exchange performance of the flat tube and the heat exchanger using the flat tube.
  • the bending radius of the conventional bending heat exchanger is large, and the bending angle is limited, especially the lower limit of the angle.
  • the bending radius of the conventional microchannel heat exchanger is generally required to be greater than 5t to meet the strength and corrosion resistance of the flat tube bending section .
  • This scheme discloses a flat tube structure with a smaller bending radius, and it has been verified by experiments that while meeting the requirements for the strength and corrosion resistance of the flat tube, the length of the bending section can be further effectively reduced, and the length of the effective section of the fin can be relatively increased . That is, the ratio of the effective heat exchange area to the area of the overall heat exchanger will become larger.
  • the straight section connected to the bent section of the flat tube is moderately folded outward in the opposite direction, so that the height of the heat exchanger is reduced, and the bottom is properly opened, which can reduce the overall height of the heat exchanger with this flat tube structure, and relatively increase Large heat exchanger frontal area, thus improving heat transfer performance.

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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

本申请提供了一种扁管及换热器，扁管的中部形成折弯段，扁管位于折弯段外的区域形成两个平直段，折弯段包括折弯部和两个扭转部，每个扭转部的两端分别和折弯段的一端以及一个平直段连接；其中，折弯部绕平行于扁管厚度方向的轴线弯曲，折弯部内侧的最小曲率半径为RNmin，扁管的厚度为t，t＜RNmin＜5t。在该方案中，将折弯部内侧的最小曲率半径设置的比较小的情况下即可完成折弯变形，这样可以减小折弯段的长度，从而增大了平直段的长度，进而提高了扁管以及应用该扁管的换热器的换热性能。

Description

扁管及换热器 技术领域
本申请涉及换热器技术领域，具体而言，涉及一种扁管及换热器。
背景技术
对于采用扁管的换热器，为了增大换热面积并简化结构，一些换热器中将扁管进行折弯以形成双排结构。现有的换热器中扁管的折弯段的长度都较长，这相对缩短了非折弯段的长度，这样布置翅片的区域较小，影响换热器的换热性能。
发明内容
本申请提供了一种扁管及换热器，以解决现有的换热器换热性能差的问题。
为了解决上述问题，根据本申请的一个方面，本申请提供了一种扁管，所述扁管的中部形成折弯段，所述扁管位于所述折弯段外的区域形成两个平直段，所述折弯段包括折弯部和两个扭转部，每个所述扭转部的两端分别和所述折弯段的一端以及一个所述平直段连接；其中，所述折弯部绕平行于所述扁管厚度方向的轴线弯曲，所述折弯部内侧的最小曲率半径为RNmin，所述扁管的厚度为t，t＜RNmin＜5t。
进一步地，所述折弯部内侧的最大曲率半径为RNmax，t＜RNmax＜5t。
进一步地，所述折弯部外侧的最小曲率半径为RWmin，t＜RWmin＜5t。
进一步地，所述折弯部外侧的最大曲率半径为RWmax，t＜RWmax＜5t。
进一步地，RNmin为4.5t、4t或3t。
进一步地，所述折弯部内侧的最大曲率半径为RNmax，RNmax≥5t；所述折弯部外侧的最小曲率半径为RWmin，RWmin≥5t。
进一步地，两个所述扭转部和所述折弯部的交接处分别具有预设切线，两个所述预设切线之间的夹角为θ，两个所述平直段之间的夹角为α，其中，α＞θ。
进一步地，α≤90°。
进一步地，所述扁管具有预设的对称面，所述对称面将所述折弯部分为对称的两部分，两个所述扭转部相对于所述对称面对称设置，两个所述平直段相对于所述对称面对称设置。
根据本申请的另一方面，提供了一种换热器，所述换热器包括多个并排设置的扁管，相邻两个所述扁管的平直段之间设置有翅片。
应用本申请的技术方案，提供了一种扁管，扁管的中部形成折弯段，扁管位于折弯段外的区域形成两个平直段，折弯段包括折弯部和两个扭转部，每个扭转部的两端分别和折弯段的一端以及一个平直段连接；其中，折弯部绕平行于扁管厚度方向的轴线弯曲，折弯部内侧的最小曲率半径为RNmin，扁管的厚度为t，t＜RNmin＜5t。在该方案中，将折弯部内侧的最小曲率半径设置的比较小的情况下即可完成折弯变形，这样可以减小折弯段的长度，从而增大了平直段的长度，进而提高了扁管以及应用该扁管的换热器的换热性能。
常规折弯换热器折弯半径较大，折弯角度受到限制，尤其是角度下限，常规微通道换热器折弯半径普遍要求大于5t，以满足扁管折弯段的强度和耐腐蚀性。本方案公开一种更小折弯半径的扁管结构，并经过实验验证，在满足扁管强度和耐腐蚀性要求的同时，可进一步有效减小折弯段长度，相对增加翅片有效段长度。即有效换热面积相对于整体换热器的面积的占比会变大。同时，将与扁管折弯段相连的直线段适度向反方向外折，使换热器高度降低，而底部适当张开，可降低具有此扁管结构的换热器整体高度，并相对增大换热器迎风面积，从而提高换热性能。
附图说明
构成本申请的一部分的说明书附图用来提供对本申请的进一步理解，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1示出了本申请的实施例提供的扁管的主视图；
图2示出了图1中的扁管的立体图；
图3示出了图1中的扁管的侧视图；
图4示出了本申请的实施例提供的换热器的结构示意图；
图5示出了图4中的换热器在扁管折弯前的示意图。
其中，上述附图包括以下附图标记：
10、折弯段；11、折弯部；12、扭转部；13、预设切线；20、平直段；30、翅片。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本申请及其应用或使用的任何限制。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
如图1至图3所示，本申请的实施例提供了一种扁管，扁管的中部形成折弯段10，扁管位于折弯段10外的区域形成两个平直段20，折弯段10包括折弯部11和两个扭转部12，每个 扭转部12的两端分别和折弯段10的一端以及一个平直段20连接；其中，折弯部11绕平行于扁管厚度方向的轴线弯曲，折弯部11内侧的最小曲率半径为RNmin，扁管的厚度为t，t＜RNmin＜5t。其中，扁管的两个平直段20一侧的两个宽度方向的表面位于同一平面，另一侧的两个宽度方向的表面位于相同的另一个平面，这样有利于应用该扁管的换热中多个扁管的排布以及翅片的布置。折弯部11外侧的曲率半径大于内侧的曲率半径。
在该方案中，将折弯部11内侧的最小曲率半径设置为t＜RNmin＜5t，这样最小曲率半径比较小的情况下即可完成折弯变形，这样可以减小扁管的折弯段10的长度，从而增大了平直段20的长度，进而提高了扁管以及应用该扁管的换热器的换热性能。
具体地，RNmin可以设置为4.5t、4t或3t等尺寸。
在另一实施例中，t＜RNmin＜5t，折弯部11内侧的最大曲率半径为RNmax，t＜RNmax＜5t。这样可保证折弯部11内侧的最大曲率半径比较小，以减小折弯段10占用扁管的长度，从而增大了平直段20的长度。在平直段20上可以布置翅片，这样增加了布置翅片的区域，从而提高了换热器的换热性能。
在另一实施例中，t＜RNmin＜5t，折弯部11外侧的最小曲率半径为RWmin，t＜RWmin＜5t。具体地，t＜RNmin＜4t，2t＜RWmin＜5t。这样可减小折弯部11的曲率，从而以较小的折弯半径弯曲成型，因此与现有技术相比，折弯段10可减小长度。
或者，在另一实施例中，t＜RNmin＜5t，折弯部11外侧的最大曲率半径为RWmax，t＜RWmax＜5t。具体地，t＜RNmax＜4t，2t＜RWmax＜5t。这样可在满足强度和工艺要求的前提下，进一步减小折弯段10的长度。
或者，在另一实施例中，t＜RNmin＜5t，折弯部11内侧的最大曲率半径为RNmax，RNmax≥5t；折弯部11外侧的最小曲率半径为RWmin，RWmin≥5t。这样折弯部11便于弯曲成型。
在上述实施例中，两个扭转部12和折弯部11的交接处分别具有预设切线13，两个预设切线13之间的夹角为θ，两个平直段20之间的夹角为α，其中，α＞θ。即折弯部11在弯曲成型后，将扁管的两个平直段20部分外折，这样减小了扁管的高度，便于在有限的空间内布置。而且，扁管的底部适当张开，可降低具有此扁管结构的换热器整体高度，并相对增大换热器迎风面积，从而提高换热性能。
具体地，α≤90°。例如将α设置为30°或60°。
进一步地，扁管具有预设的对称面，对称面将折弯部11分为对称的两部分，两个扭转部12相对于对称面对称设置，两个平直段20相对于对称面对称设置。这样便于扁管成型以及多个扁管的布置。
如图4和图5所示，本申请的另一实施例提供了一种换热器，换热器包括多个并排设置的扁管，相邻两个扁管的平直段20之间设置有翅片30。在该方案中，将折弯部11内侧的最小曲率半径设置为t＜RNmin＜5t，这样最小曲率半径比较小的情况下即可完成折弯变形，这 样可以减小扁管的折弯段10的长度，从而增大了平直段20的长度，进而提高了扁管以及应用该扁管的换热器的换热性能。
常规折弯换热器折弯半径较大，折弯角度受到限制，尤其是角度下限，常规微通道换热器折弯半径普遍要求大于5t，以满足扁管折弯段的强度和耐腐蚀性。本方案公开一种更小折弯半径的扁管结构，并经过实验验证，在满足扁管强度和耐腐蚀性要求的同时，可进一步有效减小折弯段长度，相对增加翅片有效段长度。即有效换热面积相对于整体换热器的面积的占比会变大。同时，将与扁管折弯段相连的直线段适度向反方向外折，使换热器高度降低，而底部适当张开，可降低具有此扁管结构的换热器整体高度，并相对增大换热器迎风面积，从而提高换热性能。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (10)

  1. 一种扁管，其特征在于，
    所述扁管的中部形成折弯段(10)，所述扁管位于所述折弯段(10)外的区域形成两个平直段(20)，所述折弯段(10)包括折弯部(11)和两个扭转部(12)，每个所述扭转部(12)的两端分别和所述折弯段(10)的一端以及一个所述平直段(20)连接；
    其中，所述折弯部(11)绕平行于所述扁管厚度方向的轴线弯曲，所述折弯部(11)内侧的最小曲率半径为RNmin，所述扁管的厚度为t，t＜RNmin＜5t。
  2. 根据权利要求1所述的扁管，其特征在于，
    所述折弯部(11)内侧的最大曲率半径为RNmax，t＜RNmax＜5t。
  3. 根据权利要求1所述的扁管，其特征在于，
    所述折弯部(11)外侧的最小曲率半径为RWmin，t＜RWmin＜5t。
  4. 根据权利要求1所述的扁管，其特征在于，
    所述折弯部(11)外侧的最大曲率半径为RWmax，t＜RWmax＜5t。
  5. 根据权利要求1所述的扁管，其特征在于，RNmin为4.5t、4t或3t。
  6. 根据权利要求1所述的扁管，其特征在于，
    所述折弯部(11)内侧的最大曲率半径为RNmax，RNmax≥5t；
    所述折弯部(11)外侧的最小曲率半径为RWmin，RWmin≥5t。
  7. 根据权利要求1所述的扁管，其特征在于，两个所述扭转部(12)和所述折弯部(11)的交接处分别具有预设切线(13)，两个所述预设切线(13)之间的夹角为θ，两个所述平直段(20)之间的夹角为α，其中，α＞θ。
  8. 根据权利要求7所述的扁管，其特征在于，α≤90°。
  9. 根据权利要求1所述的扁管，其特征在于，所述扁管具有预设的对称面，所述对称面将所述折弯部(11)分为对称的两部分，两个所述扭转部(12)相对于所述对称面对称设置，两个所述平直段(20)相对于所述对称面对称设置。
  10. 一种换热器，其特征在于，所述换热器包括多个并排设置的扁管，相邻两个所述扁管的平直段(20)之间设置有翅片(30)。
PCT/CN2022/095334 2021-06-09 2022-05-26 扁管及换热器 Ceased WO2022257776A1 (zh)

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