CN217330855U - Double-sided reinforced heat transfer pipe with pyramid stamped on surface - Google Patents
Double-sided reinforced heat transfer pipe with pyramid stamped on surface Download PDFInfo
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- CN217330855U CN217330855U CN202122997336.8U CN202122997336U CN217330855U CN 217330855 U CN217330855 U CN 217330855U CN 202122997336 U CN202122997336 U CN 202122997336U CN 217330855 U CN217330855 U CN 217330855U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to a heat-transfer pipe is reinforceed to two-sided of surface punching press pyramid, include: the tube body adopts a stamping technology to form convex pyramid-shaped rough elements and concave pyramid-shaped rough elements on the inner and outer tube walls, the convex pyramid-shaped rough elements and the concave pyramid-shaped rough elements are uniformly arranged at intervals along the circumferential direction and the axial direction of the tube to form a double-sided reinforced heat transfer tube, the pyramid-shaped rough elements are formed by converging four smooth surfaces to form the bottom points of the concave pyramid-shaped rough elements and the top points of the convex pyramid-shaped rough elements, and ridge lines of the pyramid-shaped rough elements are distributed in a straight line. More heat transfer areas are increased, and transverse vortexes and longitudinal vortexes are generated by the fluid inside and outside the heat transfer pipe in an induced mode, so that the disturbance of the fluid inside and outside the heat transfer pipe is increased; the generated vortex can destroy the continuity of the flowing boundary layer and the thermal boundary layer of the inner wall surface and the outer wall surface of the heat transfer pipe, and is beneficial to strengthening the heat transfer inside and outside the pipe. The double-sided reinforced heat transfer pipe with the surface stamping pyramid reduces metal consumption under the condition of the same heat transfer quantity, and has the characteristics of high efficiency and energy saving.
Description
Technical Field
The utility model relates to a two-sided enhanced heat-transfer pipe of surface punching press pyramid.
Background
The tubular heat exchanger is widely applied, such as a shell-and-tube heat exchanger and a tube-fin heat exchanger in the field of petrochemical industry. The heat exchange tube is one of the core components of the heat exchanger, and the heat exchange performance of the heat exchange tube directly influences the overall performance of the heat exchanger. In order to improve the overall performance of heat exchange equipment, various designs have been made on the structure of heat exchange tubes.
The double-sided enhanced heat transfer pipe with the pyramid-shaped surface is particularly suitable for fluid working media with high oil viscosity and is mainly used for a shell-and-tube heat exchanger, the enhanced heat transfer mechanism of the double-sided enhanced heat transfer pipe is to increase the heat transfer area and destroy a fluid boundary layer to generate secondary flow enhanced fluid disturbance, the heat transfer performance of the heat exchanger is greatly improved, the principle of enhanced heat transfer is fully utilized, and the enhanced heat transfer special pipe can save production materials.
The utility model aims at overcoming the one-way not enough of reinforceing the heat transfer pipe now, process into the rough first heat transfer mechanical tubes of a surface punching press pyramid form through the surface with smooth heat exchange tube, prepare out a heat transfer efficiency height and use extensive two-way heat exchange tube of reinforceing.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a two-sided enhancement heat-transfer pipe of surface punching press pyramid can reduce metal consumption, reduce cost under the same condition of heat transfer capacity.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
a double-sided reinforced heat transfer pipe with a pyramid-shaped surface is designed, wherein a stamping technology is adopted to form convex pyramid-shaped rough elements and concave pyramid-shaped rough elements on the inner pipe wall and the outer pipe wall of a light pipe, the convex pyramid-shaped rough elements and the concave pyramid-shaped rough elements are uniformly arranged at intervals along the circumferential direction and the axial direction of the pipe to form the double-sided reinforced heat transfer pipe, the pyramid-shaped rough elements are formed by converging four smooth surfaces to form the bottom points of the concave pyramid-shaped rough elements and the top points of the convex pyramid-shaped rough elements, and ridge lines of the pyramid-shaped rough elements are distributed linearly.
The double-sided reinforced heat transfer pipe with the pyramid-shaped surface is characterized in that: the radial section where the top ends of the pyramid-shaped rough elements are located is distributed in a petal shape, and the axial section where the top ends of the pyramid-shaped rough elements are located is a wave-shaped pipe wall with alternate concave and convex shapes.
The double-sided reinforced heat transfer pipe with the pyramid-shaped surface is characterized in that: the pyramid-shaped rough elements can be in a diamond shape or a parallelogram shape, the length of the pyramid-shaped rough elements in the main flow direction of the pyramid-shaped rough elements is L, the elevation angle of the pyramid-shaped rough elements perpendicular to the main flow direction is represented by theta, the height of the pyramid-shaped rough elements is H, and the pyramid-shaped rough elements are closely arranged on the pipe body. The diameter of a round pipe on the surface of the pyramid-shaped double-sided reinforced heat transfer pipe before the pyramid-shaped rough element is stamped is D, and the inner pipe wall and the outer pipe wall of the reinforced heat transfer pipe are both wave-shaped expansion wall surfaces. The pyramid-shaped rough element can be in a diamond shape or a parallelogram shape and is confirmed according to the length ratio L/D, the elevation angle theta and the height ratio H/D of the pyramid-shaped rough element. The structural parameter range of the double-sided reinforced heat transfer pipe of the pyramid is that the length ratio L/D of the pyramid-shaped coarse elements is 0.26-1.05, the relative height H/D is 0.079-0.1, and the elevation angle theta is 39.8-71.6 degrees.
The novel technical effects are mainly reflected in that:
(1) the utility model discloses in the coarse first of continuous unsmooth alternate pyramid form, can reduce metal consumption, reduce cost under the same heat transfer capacity condition, and the inside and outside surface of pipe all is that one-way heat-transfer pipe can play two-sided intensive heat transfer's effect is compared to uneven wave pipe wall.
(2) The utility model discloses the coarse first of unsmooth alternate pyramid form in well, its length, angle of elevation and height variation range are very little, and the coarse first of every pyramid is very little, and inseparable arranging on the pipe wall, compares smooth circular heat-transfer pipe and can increase more heat transfer area.
(3) The utility model discloses in owing to have the coarse unit of continuous unsmooth alternate pyramid form, can produce to superpose in the vortex along mainstream direction, increase the disturbance of fluid in strengthening the intraductal disturbance, the vertical vortex of production can destroy the continuity of flowing boundary layer and thermal boundary layer, has disturbed the fluid flow state, reaches the purpose of strengthening the heat transfer.
Drawings
Fig. 1 is a schematic diagram of a three-dimensional model of a double-sided enhanced heat transfer tube with a pyramid punched on the surface.
Fig. 2 is an axial cross-sectional view of a double-sided enhanced heat transfer tube with pyramid stamped surfaces.
Fig. 3 is a schematic diagram of the parameters of the pyramid-shaped coarse cell structure.
FIG. 4 is a radial cross-sectional view of the pyramid-shaped rough element tip.
FIG. 5 is a graph of the results of the first example showing the variation of the Nu number of the enhanced heat transfer factor with the Reynolds number Re.
FIG. 6 is a graph showing the variation of the resistance coefficient f at different Reynolds numbers Re according to the calculation result of the first embodiment.
FIG. 7 is a graph showing the change of the integrated enhanced heat transfer evaluation factor JF with the Reynolds number Re as a result of calculation in the first example.
In the figure, 1-tube body; 2-pyramid-shaped rough elements; 3-sunken pyramid-shaped rough elements; 4-raised pyramid-shaped rough elements; 5-the bottom points of the concave pyramid-shaped coarse elements; 6-the apex of the convex pyramid-shaped coarse element; 7-edges of pyramid-shaped coarse elements; 8.9, 10, 11-four smooth surfaces constituting pyramid-shaped roughness elements.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures. Fig. 1 is a schematic diagram of a three-dimensional model of the present invention.
With reference to fig. 1 to 4, the invention provides a double-sided reinforced heat transfer tube (1) with a pyramid punched on the surface, wherein the double-sided reinforced heat transfer tube comprises pyramid-shaped rough elements (2) uniformly arranged in the axial direction and the circumferential direction of the double-sided reinforced heat transfer tube, and the pyramid-shaped rough elements (2) are formed on the surface of the tube at one time through processing. The pyramid-shaped rough elements (2) shown in fig. 2 are rhombus, but are not limited to rhombus and may also be parallelogram, and the axial section of the double-sided reinforced heat transfer pipe with pyramid-shaped rough elements punched on the surface is a wavy pipe wall with alternate concave and convex. In fig. 4, the radial section where the top end of the pyramid-shaped rough element is located is a petal-shaped section with 5 pyramid-shaped rough elements, the side length of each pyramid-shaped rough element (2) is 15mm, and the height of each pyramid-shaped rough element is 1.9 mm.
For the purpose of illustrating the objects and advantages of the present invention, the present invention will be further described with reference to the following numerical calculation examples. It should be understood that the specific examples described herein are for purposes of illustration only and are not intended to limit the invention. Any person skilled in the art can replace or change the technical solution and the design of the present invention equally within the technical scope of the present invention, and all the technical solutions and the design of the present invention should be covered within the protection scope of the present invention.
Example one
In this example, a pyramid-shaped double-sided enhanced heat transfer tube and a light pipe of the same size were punched on a surface having a length D of 19mm and a total tube length of 480mm, and flow and heat transfer characteristics were numerically simulated in a range of 50 to 500 under the boundary condition of an equal wall temperature (UWT), and the influence of fluid flow and heat transfer in the tube was analyzed by comparison for the double-sided enhanced heat transfer tube having a pyramid-shaped roughness element punched on the surface, wherein the structural parameters of the pyramid-shaped roughness element were respectively set to a length ratio L/D of 0.31, an elevation angle θ of 45 °, and a height ratio H/D of 0.09, and the comparison results are shown in fig. 5, 6, and 7.
Fig. 5 shows the relationship between the number of the enhanced heat transfer factor Nu and the reynolds number Re of the double-sided enhanced heat transfer tube with the pyramid punched on the surface, and it can be seen from the figure that the heat transfer factor of the enhanced heat transfer tube increases with the increase of the reynolds number, and the heat transfer capacity of the enhanced heat transfer tube is enhanced by 13.39% -19.2% compared with that of a smooth circular tube under the same reynolds number.
Fig. 6 shows the variation of the flow resistance coefficient f of the double-sided enhanced heat transfer tube with pyramid punched on the surface under different reynolds numbers Re, and it can be seen from the figure that the flow resistance coefficient f of the enhanced heat transfer tube is in a descending trend along with the increase of the reynolds number, and the resistance of the enhanced heat transfer tube is enhanced by 28.9% -67.2% compared with that of a smooth round tube under the same reynolds number.
FIG. 7 shows the variation of the total evaluation factor JF with the Reynolds number Re in a double-sided enhanced heat transfer tube with pyramid stamped on the surface, and it can be seen from the figure that the total evaluation factor JF increases with the increase of the Reynolds number Re, and that the enhanced heat transfer is higher for the same Reynolds number than for a smooth round tubeThe resistance-enhanced heat transfer comprehensive evaluation factors of the pipes are all larger than 1, and the enhanced heat transfer comprehensive evaluation factor JF is defined as JF (Nu/Nu) 0 )/(f/f 0 ) 1/3 Where Nu is 0 And f 0 The nussel number and the drag coefficient of a smooth circular tube are respectively.
Claims (3)
1. A double-sided reinforced heat transfer tube with a pyramid-shaped punched surface comprises: body (1) and the coarse unit of pyramid form (2), its characterized in that: the pipe body (1) adopts a stamping technology to form convex pyramid-shaped rough elements (4) and concave pyramid-shaped rough elements (3) on the inner and outer pipe walls, the convex pyramid-shaped rough elements and the concave pyramid-shaped rough elements are uniformly arranged at intervals along the circumferential direction and the axial direction of the pipe to form a double-sided reinforced heat transfer pipe, the pyramid-shaped rough elements (2) are formed by converging four smooth surfaces (8), (9), (10) and (11) to form bottom points (5) of the concave pyramid-shaped rough elements (3) and top points (6) of the convex pyramid-shaped rough elements (4), and ridge lines (7) of the pyramid-shaped rough elements (2) are distributed linearly.
2. The double-sided enhanced heat transfer tube with a stamped pyramid in accordance with claim 1, wherein: the radial section where the top end of the pyramid-shaped rough element is located is distributed in a petal shape, and the axial section where the top end of the pyramid-shaped rough element is located is a wave-shaped pipe wall with alternate concave and convex parts.
3. The double-sided enhanced heat transfer tube with a stamped pyramid in accordance with claim 1, wherein: the pyramid-shaped coarse element length in the main flow direction of the pyramid-shaped coarse element is L, the pyramid-shaped coarse element elevation angle perpendicular to the main flow direction is represented by theta, the height of the pyramid-shaped coarse element is H, the pyramid-shaped coarse elements are tightly arranged on the tube body, the diameter of a round tube on the surface of the pyramid-shaped double-sided reinforced heat transfer tube before the pyramid-shaped coarse element is stamped is D, the inner tube wall and the outer tube wall of the reinforced heat transfer tube are both wave-shaped expansion wall surfaces, and the structural parameter range of the pyramid-shaped double-sided reinforced heat transfer tube is that the length ratio L/D of the pyramid-shaped coarse element is 0.26-1.05, the relative height H/D is 0.079-0.1, and the elevation angle theta is 39.8-71.6 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122997336.8U CN217330855U (en) | 2021-12-02 | 2021-12-02 | Double-sided reinforced heat transfer pipe with pyramid stamped on surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122997336.8U CN217330855U (en) | 2021-12-02 | 2021-12-02 | Double-sided reinforced heat transfer pipe with pyramid stamped on surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217330855U true CN217330855U (en) | 2022-08-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122997336.8U Active CN217330855U (en) | 2021-12-02 | 2021-12-02 | Double-sided reinforced heat transfer pipe with pyramid stamped on surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217330855U (en) |
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2021
- 2021-12-02 CN CN202122997336.8U patent/CN217330855U/en active Active
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