A heat exchange tube, a heat exchanger, and an air conditioner

Abstract

The present invention discloses a heat exchange tube, a heat exchanger, and an air conditioner, relating to the technical field of heat exchange devices. Specifically, it includes a tube body, and at least one columnar protrusion for disturbing the fluid in the tube body is provided on the inner wall of the tube body. The end face of the free end of the columnar protrusion is fan-shaped, and the horizontal height of the position where the vertex of the fan shape on the columnar protrusion is located is less than the horizontal height of the position where the arc of the fan shape on the columnar protrusion is located. The resistance of the fluid in the heat exchange tube and the heat transfer resistance are further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange devices, and particularly relates to a heat exchange tube, a heat exchanger, and an air conditioner. Background Art

[0002] As a very important heat transfer element, the optimization and upgrading of the inner and outer fin structures of heat exchange tubes have always been the key research directions in related fields. Taking a conventional heat exchange tube as an example, its internal teeth are generally multi-start spiral teeth with a trapezoidal or triangular cross-section. The heat transfer performance of the heat exchange tube is controlled by controlling parameters such as the number of internal teeth, the spiral angle, and the tooth height.

[0003] The threaded internal tooth structure is relatively simple, and it can only promote the disturbance of the primary fluid. Heat exchange tube manufacturers often enhance the disturbance to promote heat transfer by increasing the tooth height and helix, but small vortex regions are often formed behind the teeth (relative to the flow field direction), increasing the fluid resistance and heat transfer resistance inside the tube, which is not conducive to improving the overall heat exchange effect of the heat exchange tube.

[0004] At the same time, many scholars have studied aquatic organisms based on bionics. The results show that the body surface structures of many organisms have unique drag reduction properties. Therefore, replicating the morphological characteristics of the organism's body surface onto the material surface is a feasible and important research direction. For bionic surface drag reduction, before the 1960s, scientists generally believed that the smoother the object surface, the smaller its underwater drag. The research on surface drag reduction technology has always been carried out in the direction of reducing the surface roughness of the object to make its surface smooth enough. As people's observation of the microscopic structure of the object surface becomes deeper and deeper, it is gradually realized that a surface with a certain texture structure has better underwater drag reduction effect.

[0005] Therefore, how to further reduce the fluid resistance and heat transfer resistance inside the heat exchange tube has become an urgent technical problem to be solved. Summary of the Invention

[0006] The main object of the present invention is to provide a heat exchange tube, a heat exchanger, and an air conditioner, aiming to further reduce the fluid resistance and heat transfer resistance inside the heat exchange tube.

[0007] To achieve the above object, the present invention provides a heat exchange tube, including a tube body, at least one columnar protrusion for disturbing the fluid inside the tube body is provided on the inner wall of the tube body, the end face of the free end of the columnar protrusion is fan-shaped, and the horizontal height of the position where the vertex of the fan shape on the columnar protrusion is located is less than the horizontal height of the position where the arc of the fan shape on the columnar protrusion is located.

[0008] In an embodiment of the present application, at least one arc-shaped groove is provided on the end face of the free end of the columnar protrusion, and the arc-shaped groove is concentrically arranged with the fan shape.

[0009] In one embodiment of the present application, at least one linear groove whose length direction is parallel to the length direction of the angular bisector of the sector is further provided on the end face of the free end of the columnar protrusion.

[0010] In one embodiment of the present application, the cross-section of the linear groove is V-shaped.

[0011] In one embodiment of the present application, the depth of the arc-shaped groove is H3, and 0.02 mm < H3 < 0.15 mm.

[0012] In one embodiment of the present application, the distance between the bottom of the linear groove and the fixed end of the columnar protrusion is H2, and 0.05 mm < H2 < 0.25 mm.

[0013] In one embodiment of the present application, the radius of the sector is R, and 0.15 mm < R < 2.5 mm.

[0014] In one embodiment of the present application, the central angle of the sector is θ, and 10° < θ < 60°.

[0015] In one embodiment of the present application, when there are two or more columnar protrusions, the two or more columnar protrusions are spirally arranged along the length direction of the pipe body, and any two adjacent columnar protrusions are arranged in a staggered manner.

[0016] In one embodiment of the present application, when the columnar protrusions are spirally arranged, the included angle between the angular bisector of the sector and the axis direction of the pipe body is θ2, and 60° < θ2 < 150°.

[0017] The present application also discloses a heat exchanger, including the heat exchange tube described in any one of the above.

[0018] The present application also discloses an air conditioner, including the heat exchange tube or the heat exchanger described in any one of the above.

[0019] By adopting the above technical solution, by arranging columnar protrusions in the pipe body, setting the free end of the columnar protrusions as a sector, and setting the direction from the vertex of the sector to the arc surface as a slope surface with a height difference, the flow guiding of the fluid in the pipe body by the columnar protrusions is strengthened. Further reducing the resistance of the fluid in the heat exchange tube and the heat transfer resistance, improving the heat exchange efficiency of the heat exchange tube, with a simple structure and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described in detail below in conjunction with specific embodiments and drawings, where:

[0021] Figure 1 is a schematic structural diagram of the first embodiment of the present invention.

[0022] Figure 2 isFigure 1 Planar development view

[0023] Figure 3 is Figure 1 Enlarged structural schematic diagram of the columnar protrusion in Specific embodiments

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following specific embodiments are only used to explain the present invention and do not constitute a limitation to the present invention.

[0025] As Figures 1 to 3 shown, in order to achieve the above objectives, the present invention provides a heat exchange tube, which includes a tube body 10. At least one columnar protrusion 20 for disturbing the fluid in the tube body 10 is provided on the inner wall of the tube body 10. The end face of the free end of the columnar protrusion 20 is fan-shaped, and the horizontal height of the position where the vertex of the fan shape on the columnar protrusion 20 is located is less than the horizontal height of the position where the arc of the fan shape on the columnar protrusion 20 is located.

[0026] Specifically, the present invention provides a heat exchange tube, which includes a tube body 10 and a columnar protrusion 20 arranged in the tube body 10.

[0027] Among them, the tube body 10 is made of a metal material, such as an aluminum alloy material, a alloy steel material, etc. The tube body 10 made of a metal material has the advantages of strong supporting ability, wear resistance, good heat conduction performance, etc.

[0028] The tube body 10 is cylindrical. The columnar protrusion 20 is arranged inside the tube body 10. The columnar protrusion 20 is made of the same material as the tube body 10. The columnar protrusion 20 and the tube body 10 are connected in a fixed connection manner, such as welding. Connecting the columnar protrusion 20 and the tube body 10 in a fixed connection manner can improve the connection strength between the columnar protrusion 20 and the tube body 10 and improve the stability of the columnar protrusion 20 during operation. Of course, according to the design requirements, the columnar protrusion 20 and the tube body 10 can also be connected in a detachable manner, such as screw connection, bolt connection, etc. Connecting the columnar protrusion 20 and the tube body 10 in a detachable manner can facilitate the installation and disassembly of the columnar protrusion 20 and is convenient for later maintenance. It can be imagined that the columnar protrusion 20 can also be obtained by pressing the inner wall of the tube body 10 with a pressing tool, and the specific processing method is not limited here one by one.

[0029] One end of the columnar protrusion 20 connected to the pipe body 10 is a fixed end, and the end of the columnar protrusion 20 away from the pipe body 10 is a free end. The end face of the free end of the columnar protrusion 20 is fan-shaped, and the horizontal height of the position where the vertex of the fan shape on the columnar protrusion 20 is located is less than the horizontal height of the position where the arc surface of the fan shape on the columnar protrusion 20 is located, so as to realize the setting of an inclined slope surface at the free end of the columnar protrusion 20. Through this slope surface, the resistance of the fluid in the heat exchange pipe and the heat transfer resistance can be further reduced. Thus, the heat exchange efficiency of the heat exchange pipe is improved. The structure is simple and easy to implement.

[0030] The position where the vertex of the fan shape on the columnar protrusion 20 is located faces the inlet of the pipe body 10, so as to conveniently reduce the resistance to the fluid in the heat exchange pipe.

[0031] When the number of the columnar protrusions 20 is one, one columnar protrusion 20 is installed in the pipe body 10 to realize the flow disturbance of the fluid.

[0032] When the number of the columnar protrusions 20 is multiple, the multiple columnar protrusions 20 are distributed in groups, and any two adjacent groups of columnar protrusions are arranged staggeredly. A wave crest and a wave trough will be formed between the two groups of staggeredly arranged columnar protrusions 20. When the fluid passes through the two groups of staggeredly arranged columnar protrusions 20, smaller vortex areas will be formed in the wave troughs of the wave crest and the wave trough. The vortices generated in the vortex areas will be separated by the position where the vertex of the fan shape of the next group of columnar protrusions 20 is located, so as to break the larger vortices into several small vortices, forming a secondary flow disturbance, and further improving the heat exchange efficiency of the pipe body 10.

[0033] By adopting the above technical solution, by arranging the columnar protrusion 20 in the pipe body 10, setting the free end of the columnar protrusion 20 to be fan-shaped, and setting the direction from the vertex to the arc surface of the fan shape to be a slope surface with a height difference, the flow guiding of the fluid in the pipe body 10 by the columnar protrusion 20 is strengthened. The resistance of the fluid in the heat exchange pipe and the heat transfer resistance are further reduced, and the heat exchange efficiency of the heat exchange pipe is improved. The structure is simple and easy to implement.

[0034] In an embodiment of the present application, at least one arc-shaped groove 21 is provided on the end face of the free end of the columnar protrusion 20, and the arc-shaped groove 21 is concentric with the fan shape.

[0035] Specifically, at least one arc-shaped groove 21 is provided on the end face of the free end of the columnar protrusion 20, and the arc-shaped groove 21 is concentric with the fan shape, so as to ensure that the distance between the arc of the arc-shaped groove 21 and the arc of the fan shape is equal, improving the flow disturbance effect of the columnar protrusion 20 and reducing the resistance to the fluid in the pipe body at the same time. By providing the arc-shaped groove 21, it helps to break the thickness of the columnar protrusion 20, reduce the thickness of the columnar protrusion 20, and reduce the thermal resistance, thereby improving the heat exchange efficiency of the pipe body 10.

[0036] With the above technical solution, an arc-shaped groove 21 is provided on the end face of the free end of the columnar protrusion 20 to reduce the thickness of the columnar protrusion 20, thereby improving the heat exchange efficiency of the pipe body 10. The structure is simple and easy to implement.

[0037] In an embodiment of the present application, at least one linear groove 22 whose length direction is parallel to the length direction of the angular bisector of the sector is further provided on the end face of the free end of the columnar protrusion 20.

[0038] Specifically, a linear groove 22 is provided on the end face of the free end of the columnar protrusion 20. The linear groove 22 refers to a straight groove, and the length direction of the linear groove 22 is parallel to the length direction of the angular bisector of the sector. Thus, it is convenient for the fluid in the pipe body 10 to flow through the free end of the columnar protrusion 20. By providing the linear groove 22, it helps to reduce the thickness of the columnar protrusion 20, thereby reducing the thermal resistance of the columnar protrusion 20 and improving the heat transfer coefficient of the pipe body 10. At the same time, when the pipe body 10 is in the evaporation condition, the linear groove and the arc-shaped groove 21 can provide a large number of vaporization core points beneficial to evaporation phase change, enhancing the phase change heat transfer effect. The length direction of the linear groove 22 is the same as the flow direction of the fluid inside the pipe body 10, thereby reducing the resistance of the fluid in the pipe body 10 and improving the heat transfer efficiency.

[0039] With the above technical solution, a linear groove 22 is further provided on the end face of the free end of the columnar protrusion 20, and the length direction of the linear groove 22 is parallel to the length direction of the angular bisector of the sector, thereby reducing the resistance to the fluid in the pipe body 10. The structure is simple and easy to implement.

[0040] In an embodiment of the present application, the cross-section of the linear groove 22 is V-shaped.

[0041] Specifically, the cross-section of the linear groove 22 is V-shaped. Setting the linear groove 22 as V-shaped can facilitate the formation of vaporization core points at the bottom of the linear groove 22. After the bubbles generated in the vaporization core points enter the fluid, it further enhances the disturbance of the fluid and enhances the phase change heat transfer effect of the pipe body 10.

[0042] In an embodiment of the present application, the depth of the arc-shaped groove 21 is H3, and 0.02 mm < H3 < 0.15 mm.

[0043] Specifically, the depth of the arc-shaped groove 21 is H3, and 0.02 mm < H3 < 0.15 mm, which helps to break the thickness of the columnar protrusion 20, reduce the thermal resistance, and thereby improve the heat transfer efficiency of the pipe body 10. The depth H3 of the arc-shaped groove 21 is preferably 0.05 mm.

[0044] In an embodiment of the present application, the distance between the bottom of the linear groove 22 and the fixed end of the columnar protrusion 20 is H2, where 0.05 mm < H2 < 0.25 mm.

[0045] Specifically, the distance between the bottom of the linear groove 22 and the fixed end of the columnar protrusion 20 is H2, where 0.05 mm < H2 < 0.25 mm. This helps the linear groove 22 reduce the resistance to the fluid, and at the same time facilitates the formation of vaporization core points at the bottom of the linear groove 22. The bubbles generated at the vaporization core points can improve the disturbance of the fluid in the pipe body 10, thereby enhancing the phase change heat transfer effect. The depth of the linear groove 22 is preferably 0.1 mm.

[0046] In an embodiment of the present application, the radius of the sector is R, where 0.15 mm < R < 2.5 mm.

[0047] Specifically, the radius of the sector is R, where 0.15 mm < R < 2.5 mm. This reduces the resistance of the columnar protrusion 20 to the fluid in the pipe body 10 and improves the heat transfer effect of the pipe body 10 at the same time. R is preferably 0.8 mm.

[0048] In an embodiment of the present application, the central angle of the sector is θ, where 10° < θ < 60°.

[0049] Specifically, the central angle of the sector is θ, where 10° < θ < 60°. This reduces the resistance of the columnar protrusion 20 to the fluid in the pipe body 10 and improves the heat transfer effect of the pipe body 10 at the same time. θ is preferably 30°.

[0050] In an embodiment of the present application, when there are two or more columnar protrusions 20, the two or more columnar protrusions 20 are spirally arranged along the length direction of the pipe body 10, and any two adjacent columnar protrusions 20 are staggered.

[0051] Specifically, when there are two or more columnar protrusions 20, the two or more columnar protrusions 20 are spirally arranged along the length direction of the pipe body 10, thereby reducing the resistance of the columnar protrusions 20 to the fluid in the pipe body 10. At the same time, the staggered arrangement of any two adjacent columnar protrusions 20 facilitates the formation of vortices between two adjacent columnar protrusions 20, which are divided into two small vortices by the next columnar protrusion 20, thereby improving the turbulence effect on the fluid in the pipe body 10. The structure is simple and easy to implement.

[0052] In an embodiment of the present application, when the columnar protrusions 20 are spirally arranged, the included angle between the angular bisector of the sector and the axis direction of the pipe body 10 is θ2, where 60° < θ2 < 150°.

[0053] Specifically, when the columnar protrusions 20 are spirally arranged, the included angle between the angular bisector of the sector and the axial direction of the pipe body 10 is θ2, where 60° < θ2 < 150°, which can reduce the resistance to the fluid in the pipe body 10 and improve the heat exchange efficiency. θ2 is preferably 120°.

[0054] The present application also discloses a heat exchanger, including the heat exchange tube described in any one of the above.

[0055] The present application also discloses an air conditioner, including the heat exchange tube or the heat exchanger described in any one of the above.

[0056] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A heat exchange tube, characterized in that, It includes a pipe body, and at least one columnar protrusion for disturbing the fluid in the pipe body is provided on the inner wall of the pipe body. The end face of the free end of the columnar protrusion is fan-shaped, and the horizontal height of the position where the vertex of the fan shape on the columnar protrusion is located is less than the horizontal height of the position where the arc of the fan shape on the columnar protrusion is located. When there are two or more columnar protrusions, the two or more columnar protrusions are spirally arranged along the length direction of the pipe body, and any two adjacent columnar protrusions are arranged in a staggered manner. When the columnar protrusions are spirally arranged, the included angle between the angular bisector of the fan shape and the axis direction of the pipe body is θ2, and 60° < θ2 < 150°.

2. The heat exchange tube according to claim 1, characterized in that, At least one arc-shaped groove is provided on the end face of the free end of the columnar protrusion, and the arc-shaped groove is concentric with the fan shape.

3. The heat exchange tube according to claim 1, characterized in that, At least one linear groove with a length direction parallel to the length direction of the angular bisector of the fan shape is further provided on the end face of the free end of the columnar protrusion.

4. The heat exchange tube according to claim 3, characterized in that, The cross section of the linear groove is V-shaped.

5. The heat exchange tube according to claim 2, characterized in that, The depth of the arc-shaped groove is H3, and 0.02 mm < H3 < 0.15 mm.

6. The heat exchange tube according to claim 3, characterized in that, The distance between the bottom of the linear groove and the fixed end of the columnar protrusion is H2, and 0.05 mm < H2 < 0.25 mm.

7. The heat exchange tube according to claim 1, characterized in that, The radius of the fan shape is R, and 0.15 mm < R < 2.5 mm.

8. The heat exchange tube according to claim 1, characterized in that, The central angle of the fan shape is θ, and 10° < θ < 60°.

9. A heat exchanger, characterized in that, It includes the heat exchange pipe according to any one of claims 1 to 8.

10. An air conditioner, characterized in that, It includes the heat exchange pipe according to any one of claims 1 to 8 or the heat exchanger according to claim 9.

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