WO2015114015A1 - Sectional uneven inner grooved tube - Google Patents

Sectional uneven inner grooved tube Download PDF

Info

Publication number
WO2015114015A1
WO2015114015A1 PCT/EP2015/051724 EP2015051724W WO2015114015A1 WO 2015114015 A1 WO2015114015 A1 WO 2015114015A1 EP 2015051724 W EP2015051724 W EP 2015051724W WO 2015114015 A1 WO2015114015 A1 WO 2015114015A1
Authority
WO
WIPO (PCT)
Prior art keywords
grooved tube
inner grooved
fins
fin
uneven inner
Prior art date
Application number
PCT/EP2015/051724
Other languages
French (fr)
Inventor
Shicai TANG
Original Assignee
Luvata Espoo Oy
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 Luvata Espoo Oy filed Critical Luvata Espoo Oy
Publication of WO2015114015A1 publication Critical patent/WO2015114015A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—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
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00—Fins
    • F28F2215/04—Assemblies of fins having different features, e.g. with different fin densities

Definitions

  • the present invention relates to a sectional uneven inner grooved tube for heat transfer, in particular, to a sectional uneven inner grooved tube used in an electronic cooling device.
  • Heat transfer tubes with grooved inner surfaces are used primarily as evaporator tubes or condenser tubes in heat exchangers. It is known to provide heat transfer tubes with grooves and alternating "fins" on their inner surfaces. The grooves and the fins co-operate to enhance turbulence of fluid heat transfer mediums delivered within the tube. This turbulence enhances heat transfer performance. The grooves and fins also provide extra surface area and capillary effects for additional heat exchange.
  • the present invention provides a sectional uneven inner grooved tube for heat transfer, comprising:
  • At least one first fin having a first height, wherein said at least one first fin is arranged on the inner surface of the sectional uneven inner grooved tube;
  • At least one second fin having a second height greater than the first height, wherein said at least one second fin is arranged on the inner surface of the sectional uneven inner grooved tube and is spaced apart from said at least one first fin,
  • said at least one first fin extends in parallel with said at least one second fin.
  • the at least one first fin comprises at least one group of the first fins spaced apart from each other.
  • the at least one second fin comprises at least one group of the second fins spaced apart from each other.
  • said at least one group of the first fins and said at least one group of the second fins are arranged alternately on the inner surface of the sectional uneven inner grooved tube.
  • said at least one group of the first fins and said at least one group of the second fins are arranged alternately on the inner surface of the sectional uneven inner grooved tube so that the cross section of the section uneven inner grooved tube is asymmetric.
  • said at least one group of the first fins and said at least one group of the second fins are arranged alternately on the inner surface of the sectional uneven inner grooved tube so that the cross section of the section uneven inner grooved tube is symmetric.
  • a space is formed by said at least one second fin when the sectional uneven inner grooved tube is flattened, so that heat transfer medium may flow through the sectional uneven inner grooved tube via the space.
  • the sectional uneven inner grooved tube is used in an electronic cooling device.
  • said at least one first fin and said at least one second fin extend in a direction parallel to a longitudinal axis of the sectional uneven inner grooved tube.
  • said at least one first fin and said at least one second fin extend helically around a longitudinal axis of the sectional uneven inner grooved tube.
  • the outside diameter of the sectional uneven inner grooved tube is 3mm to 16mm and the thickness of the back wall of sectional uneven inner grooved tube is 0.10mm-0.60mm, the first height is 0.01mm-0.15mm, the apex angle of the first fin is 0°-50°, and the number of first fins is 1-150, and the distance between two adjacent first fins is 0.01mm-0.20mm.
  • the second height of the second fin is 0.10mm-0.30mm
  • the apex angle of the second fin is 0°-50°
  • the number of second fins is 5-100
  • the distance between two adjacent second fins is 0.10mm-0.50mm.
  • Fig. 1 is a cross sectional view of an asymmetric uneven inner grooved tube according to an embodiment of the present invention
  • FIG. 2 is an enlarged view of a portion of the asymmetric uneven inner grooved tube shown in Fig. 1 ;
  • Fig. 3 is a cross sectional view of a symmetric uneven inner grooved tube according to another embodiment of the present invention.
  • Fig. 4 is an enlarged view of a portion of the symmetric uneven inner grooved tube shown in Fig. 3.
  • Fig. 1 is a cross sectional view of an asymmetric uneven inner grooved tube 1 according to a first embodiment of the present invention
  • Fig. 2 is an enlarged view of a portion of the asymmetric uneven inner grooved tube shown in Fig. 1.
  • the asymmetric uneven inner grooved tube 1 comprises a plurality of first fins 10 having a first height hf (see Fig. 2) and a plurality of second fins 20 having a second height Hf (see Fig.2) greater than the first height hf.
  • the plurality of first fins 10 are arranged on the inner surface of the asymmetric uneven inner grooved tube 1 and are spaced apart from one other so that first grooves 1 1 are formed between two adjacent first fins 10.
  • the plurality of second fins 20 are arranged on the inner surface of the asymmetric uneven inner grooved tube 1 and are spaced apart from one other so that second grooves 21 are formed between two adjacent second fins 20.
  • the first fins 10 extend in parallel with the second fins 20.
  • the second fins 20 will ensure that a space is formed when the tube 1 is flattened into a shape shown with a dashed line, so that heat transfer medium, such as vapor, may flow through the space.
  • the space forms at least one flow channel for heat transfer medium, so as to speed up the circulation of the heat transfer medium. Therefore, the heat transfer efficiency will be significantly improved, as compared to the inner grooved tube with fins having the same height, for which spaces/flow channels can be destroyed when flattened.
  • Fig. 1 shows only one group of first fins 10 and one group of second fins 20 are arranged on the inner surface of the asymmetric uneven inner grooved tube 1
  • the asymmetric uneven inner grooved tube 1 may have two or more groups of first fins 10 and/or two or more groups of second fins 20. Furthermore, the number n of first fins 10 and the number N of second fins 20 contained in each group may differ between different groups.
  • the outside diameter of the asymmetric uneven inner grooved tube 1 may be in a range of 3mm-16mm, and the thickness H w of the back wall 30 may be in a range of 0.10mm-0.60mm, so that the asymmetric uneven inner grooved tube 1 , when flattened, may fit into limited spaces.
  • the parameters for the second fins 20 as well the second grooves 21 formed thereby may be defined as follows:
  • second height Hf of the second fins 20 0.10mm-0.30mm; width Gf of the second grooves 21 : 0.10mm-0.50mm;
  • apex angle ai of the second fins 20 0°-50°;
  • the parameters for the first fins 10 as well the first grooves 11 formed thereby may be defined as follows:
  • first height hf of the first fins 10 0.01mm-0.15mm;
  • width gf of the first grooves 11 0.01mm-0.20mm;
  • apex angle a 2 of the first fins 10 0°-50°;
  • n of the first fins 10 1 -150.
  • Fig. 1 and Fig. 2 show that all the first fins 10 have the same height hf, and the same apex angle a 3 ⁇ 4 and all the second fins 20 also have the same height Hf, and the same apex angle ai, the present invention is not limited to this arrangement.
  • the first fins may have different heights and/or different apex angles
  • the second fins may also have different heights and/or different apex angles. The same applies to the first grooves and second grooves.
  • Fig. 3 is a cross sectional view of a symmetric uneven inner grooved tube l a according to another embodiment of the present invention
  • Fig. 4 is an enlarged view of a portion of the symmetric uneven inner grooved tube 1 a.
  • two groups of first fins 10 and two groups of second fins 20 are provided on the inner surface of the symmetric uneven inner grooved tube la.
  • the arrangement shown in Fig. 3 facilitates the manufacturing of the symmetric uneven inner grooved tube la, since the inner grooved tube is generally made by drawing the tube through a die, and the symmetric arrangement of the first fins 10 and second fins 20 generates symmetric forces on the tube and on the die.
  • the parameters of the first fins 10 and second fins 20 as well as the tube may be defined as above. Besides, the parameters of the first fins 10 (as well as the second fins 20) may differ from one another.
  • the first fins 10 and the second fins 20 may extend in a direction parallel to a longitudinal axis of the tube, or extend helically around the longitudinal axis of the tube.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

The present invention provides a sectional uneven inner grooved tube (1) for heat transfer, comprising: at least one first fin (10) having a first height, wherein said at least one first fin is arranged on the inner surface of the sectional uneven inner grooved tube; and at least one second fin (20) having a second height greater than the first height, wherein said at least one second fin is arranged on the inner surface of the sectional uneven inner grooved tube and is spaced apart from said at least one first fin. With fins having different heights, a desirable space can be kept when the sectional inner grooved tube is flattened to fit into limited spaces, so that the heat transfer efficiency will be significantly improved, as compared to inner grooved tubes with fins having the same height.

Description

Sectional uneven inner grooved tube
TECHNICAL FIELD
[001] The present invention relates to a sectional uneven inner grooved tube for heat transfer, in particular, to a sectional uneven inner grooved tube used in an electronic cooling device.
BACKGROUND
[002] Heat transfer tubes with grooved inner surfaces are used primarily as evaporator tubes or condenser tubes in heat exchangers. It is known to provide heat transfer tubes with grooves and alternating "fins" on their inner surfaces. The grooves and the fins co-operate to enhance turbulence of fluid heat transfer mediums delivered within the tube. This turbulence enhances heat transfer performance. The grooves and fins also provide extra surface area and capillary effects for additional heat exchange.
[003] In electronic cooling devices, it is for some applications needed to flatten inner grooved tubes to fit limited spaces. However, when flattened, these kinds of inner grooved tubes cannot keep enough flow channels for heat transfer mediums to flow from evaporator end to condenser end, resulting in the heat transfer efficiency being significantly reduced. SUMMARY
[004] It is an object of the present invention to provide a sectional uneven inner grooved tube, which can keep enough flow channels for heat transfer medium to flow through when the tube is flattened.
[005] In particular, the present invention provides a sectional uneven inner grooved tube for heat transfer, comprising:
at least one first fin having a first height, wherein said at least one first fin is arranged on the inner surface of the sectional uneven inner grooved tube; and
at least one second fin having a second height greater than the first height, wherein said at least one second fin is arranged on the inner surface of the sectional uneven inner grooved tube and is spaced apart from said at least one first fin,
wherein said at least one first fin extends in parallel with said at least one second fin.
[006] With fins having different heights, a desirable space can be kept when the sectional inner grooved tube is flattened to fit limited spaces, so that the heat transfer efficiency will be significantly improved, as compared to inner grooved tube with fins having the same height.
[007] Preferably, the at least one first fin comprises at least one group of the first fins spaced apart from each other.
[008] Preferably, the at least one second fin comprises at least one group of the second fins spaced apart from each other. [009] Preferably, said at least one group of the first fins and said at least one group of the second fins are arranged alternately on the inner surface of the sectional uneven inner grooved tube.
[010] In one embodiment, said at least one group of the first fins and said at least one group of the second fins are arranged alternately on the inner surface of the sectional uneven inner grooved tube so that the cross section of the section uneven inner grooved tube is asymmetric.
[01 1] In another embodiment, said at least one group of the first fins and said at least one group of the second fins are arranged alternately on the inner surface of the sectional uneven inner grooved tube so that the cross section of the section uneven inner grooved tube is symmetric.
[012] Preferably, a space is formed by said at least one second fin when the sectional uneven inner grooved tube is flattened, so that heat transfer medium may flow through the sectional uneven inner grooved tube via the space.
[013] Preferably, the sectional uneven inner grooved tube is used in an electronic cooling device.
[014] In one embodiment, said at least one first fin and said at least one second fin extend in a direction parallel to a longitudinal axis of the sectional uneven inner grooved tube.
[015] In another embodiment, said at least one first fin and said at least one second fin extend helically around a longitudinal axis of the sectional uneven inner grooved tube.
[016] Preferably, the outside diameter of the sectional uneven inner grooved tube is 3mm to 16mm and the thickness of the back wall of sectional uneven inner grooved tube is 0.10mm-0.60mm, the first height is 0.01mm-0.15mm, the apex angle of the first fin is 0°-50°, and the number of first fins is 1-150, and the distance between two adjacent first fins is 0.01mm-0.20mm.
[017] Preferably, the second height of the second fin is 0.10mm-0.30mm, the apex angle of the second fin is 0°-50°, and the number of second fins is 5-100, and the distance between two adjacent second fins is 0.10mm-0.50mm.
[018] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
[019] Features, advantages, and technical and industrial significance of exemplary embodiments of the invention will be described below with reference to the accompanying drawings, in which like numerals denote like elements, and wherein:
[020] Fig. 1 is a cross sectional view of an asymmetric uneven inner grooved tube according to an embodiment of the present invention;
[021] Fig. 2 is an enlarged view of a portion of the asymmetric uneven inner grooved tube shown in Fig. 1 ;
[022] Fig. 3 is a cross sectional view of a symmetric uneven inner grooved tube according to another embodiment of the present invention; and
[023] Fig. 4 is an enlarged view of a portion of the symmetric uneven inner grooved tube shown in Fig. 3. DETAILED DESCRIPTION
[024] Fig. 1 is a cross sectional view of an asymmetric uneven inner grooved tube 1 according to a first embodiment of the present invention, and Fig. 2 is an enlarged view of a portion of the asymmetric uneven inner grooved tube shown in Fig. 1. As shown in Fig. 1, the asymmetric uneven inner grooved tube 1 comprises a plurality of first fins 10 having a first height hf (see Fig. 2) and a plurality of second fins 20 having a second height Hf (see Fig.2) greater than the first height hf. The plurality of first fins 10 are arranged on the inner surface of the asymmetric uneven inner grooved tube 1 and are spaced apart from one other so that first grooves 1 1 are formed between two adjacent first fins 10. Similarly, the plurality of second fins 20 are arranged on the inner surface of the asymmetric uneven inner grooved tube 1 and are spaced apart from one other so that second grooves 21 are formed between two adjacent second fins 20. The first fins 10 extend in parallel with the second fins 20.
[025] As can be seen from Fig. 1, as the second fins 20 are higher than the first fins 10, the second fins 20 will ensure that a space is formed when the tube 1 is flattened into a shape shown with a dashed line, so that heat transfer medium, such as vapor, may flow through the space. The space forms at least one flow channel for heat transfer medium, so as to speed up the circulation of the heat transfer medium. Therefore, the heat transfer efficiency will be significantly improved, as compared to the inner grooved tube with fins having the same height, for which spaces/flow channels can be destroyed when flattened.
[026] Although Fig. 1 shows only one group of first fins 10 and one group of second fins 20 are arranged on the inner surface of the asymmetric uneven inner grooved tube 1 , the present invention is not limited to this arrangement. The asymmetric uneven inner grooved tube 1 may have two or more groups of first fins 10 and/or two or more groups of second fins 20. Furthermore, the number n of first fins 10 and the number N of second fins 20 contained in each group may differ between different groups.
[027] According to a preferred embodiment, the outside diameter of the asymmetric uneven inner grooved tube 1 may be in a range of 3mm-16mm, and the thickness Hw of the back wall 30 may be in a range of 0.10mm-0.60mm, so that the asymmetric uneven inner grooved tube 1 , when flattened, may fit into limited spaces.
[028] According to a further preferred embodiment, the parameters for the second fins 20 as well the second grooves 21 formed thereby, may be defined as follows:
second height Hf of the second fins 20: 0.10mm-0.30mm; width Gf of the second grooves 21 : 0.10mm-0.50mm;
apex angle ai of the second fins 20: 0°-50°;
number N of the second fins 20: 5-100.
[029] In accordance with the above parameters defined for the second fins 20 as well as for the second grooves 21 formed thereby, the parameters for the first fins 10 as well the first grooves 11 formed thereby may be defined as follows:
first height hf of the first fins 10: 0.01mm-0.15mm;
width gf of the first grooves 11 : 0.01mm-0.20mm;
apex angle a2 of the first fins 10: 0°-50°;
number n of the first fins 10: 1 -150. [030] Although Fig. 1 and Fig. 2 show that all the first fins 10 have the same height hf, and the same apex angle a¾ and all the second fins 20 also have the same height Hf, and the same apex angle ai, the present invention is not limited to this arrangement. Alternatively, the first fins may have different heights and/or different apex angles, and the second fins may also have different heights and/or different apex angles. The same applies to the first grooves and second grooves.
[031] Fig. 3 is a cross sectional view of a symmetric uneven inner grooved tube l a according to another embodiment of the present invention; and Fig. 4 is an enlarged view of a portion of the symmetric uneven inner grooved tube 1 a. As shown in Fig. 4, two groups of first fins 10 and two groups of second fins 20 are provided on the inner surface of the symmetric uneven inner grooved tube la. The arrangement shown in Fig. 3 facilitates the manufacturing of the symmetric uneven inner grooved tube la, since the inner grooved tube is generally made by drawing the tube through a die, and the symmetric arrangement of the first fins 10 and second fins 20 generates symmetric forces on the tube and on the die.
[032] Similarly, the parameters of the first fins 10 and second fins 20 as well as the tube may be defined as above. Besides, the parameters of the first fins 10 (as well as the second fins 20) may differ from one another.
[033] The first fins 10 and the second fins 20 may extend in a direction parallel to a longitudinal axis of the tube, or extend helically around the longitudinal axis of the tube.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

Claims

1. A sectional uneven inner grooved tube for heat transfer,
characterized in
that it comprises:
at least one first fin having a first height, wherein said at least one first fin is arranged on the inner surface of the sectional uneven inner grooved tube; and
at least one second fin having a second height greater than the first height, wherein said at least one second fin is arranged on the inner surface of the sectional uneven inner grooved tube and is spaced apart from said at least one first fin,
wherein said at least one first fin extends in parallel with said at least one second fin.
2. The sectional uneven inner grooved tube for heat transfer according to claim 1 , wherein the at least one first fin comprises at least one group of the first fins spaced apart from each other.
3. The sectional uneven inner grooved tube for heat transfer according to claim 2, wherein the at least one second fin comprises at least one group of the second fins spaced apart from each other.
4. The sectional uneven inner grooved tube for heat transfer according to claim 3, wherein said at least one group of the first fins and said at least one group of the second fins are arranged alternately on the inner surface of the sectional uneven inner grooved tube.
5. The sectional uneven inner grooved tube for heat transfer according to claim 4, wherein said at least one group of the first fins and said at least one group of the second fins are arranged alternately on the inner surface of the sectional uneven inner grooved tube so that the cross section of the section uneven inner grooved tube is asymmetric.
6. The sectional uneven inner grooved tube for heat transfer according to claim 4, wherein said at least one group of the first fins and said at least one group of the second fins are arranged alternately on the inner surface of the sectional uneven inner grooved tube so that the cross section of the section uneven inner grooved tube is symmetric.
7. The sectional uneven inner grooved tube for heat transfer according to any one of the preceding claims, wherein a space is formed by said at least one second fin when the sectional uneven inner grooved tube is flattened, so that heat transfer medium may flow through the sectional uneven inner grooved tube via the space.
8. The sectional uneven inner grooved tube for heat transfer according to any one of the preceding claims, wherein the sectional uneven inner grooved tube is used in an electronic cooling device.
9. The sectional uneven inner grooved tube for heat transfer according to any one of the preceding claims, wherein said at least one first fin and said at least one second fin extend in a direction parallel to a longitudinal axis of the sectional uneven inner grooved tube.
10. The sectional uneven inner grooved tube for heat transfer according to any of claims 1-8, wherein said at least one first fin and said at least one second fin extend helically around a longitudinal axis of the sectional uneven inner grooved tube.
1 1. The sectional uneven inner grooved tube for heat transfer according to any one of the preceding claims, wherein the outside diameter of the sectional uneven inner grooved tube is 3mm to 16mm and the thickness of the back wall of sectional uneven inner grooved tube is 0.10mm-0.60mm,
wherein the first height is 0.01mm-0.15mm, the apex angle of the first fin is 0°- 50°, and the number of first fins is 1 -150; and
wherein the distance between two adjacent first fins is 0.0 lmm-0.20mm.
12. The sectional uneven inner grooved tube for heat transfer according to any one of the preceding claims, wherein the second height of the second fin is 0.10mm-0.30mm, the apex angle of the second fin is 0°-50°, and the number of second fins is 5-100; and wherein the distance between two adjacent second fins is 0.10mm-0.50mm.
PCT/EP2015/051724 2014-01-29 2015-01-28 Sectional uneven inner grooved tube WO2015114015A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410042742.0A CN104807358A (en) 2014-01-29 2014-01-29 Inner groove tube with irregular cross section
CN201410042742.0 2014-01-29

Publications (1)

Publication Number Publication Date
WO2015114015A1 true WO2015114015A1 (en) 2015-08-06

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Application Number Title Priority Date Filing Date
PCT/EP2015/051724 WO2015114015A1 (en) 2014-01-29 2015-01-28 Sectional uneven inner grooved tube

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WO (1) WO2015114015A1 (en)

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WO2019021016A1 (en) * 2017-07-27 2019-01-31 Oxford Nanosystems Ltd Heat exchange element with microstructured coating and process for production

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CN215261362U (en) * 2021-06-25 2021-12-21 重庆美的制冷设备有限公司 Copper pipe for heat exchanger, heat exchanger and air conditioner

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