Heat exchange tubes and heat exchangers

Abstract

This utility model relates to a heat exchange tube and a heat exchanger. The heat exchange tube includes a tube body and helical teeth. The helical teeth are disposed on the inner wall of the tube body and extend along the length direction of the tube body. The helical teeth include left-handed teeth and right-handed teeth, with the left-handed teeth and right-handed teeth rotating in opposite directions. In a projection plane parallel to the length direction of the tube body, the projections of the left-handed teeth and the right-handed teeth at least partially overlap. The heat exchange tube of this utility model has a reasonable structural design, which is beneficial to improving the heat exchange efficiency of the heat exchange tube.

Description

Technical Field

[0001] This utility model relates to the field of pipe processing technology, specifically to a heat exchange tube and a heat exchanger. Background Technology

[0002] Internally threaded copper tubes are a key heat transfer material in the manufacture of heat exchangers (evaporators or condensers) in air conditioners. To improve the energy efficiency ratio and achieve energy saving in air conditioners, it is necessary to increase the heat transfer per unit area of ​​the heat exchanger, control its volume and mass, and improve the heat transfer coefficient. In related technologies, unreasonable structural design of the heat exchanger tubes leads to low heat exchange efficiency. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a heat exchange tube with a reasonable structural design, which is conducive to improving the heat exchange efficiency of the heat exchange tube.

[0005] An embodiment of this utility model also proposes a heat exchanger.

[0006] The heat exchange tube of this utility model includes: a tube body and helical teeth. The helical teeth are disposed on the inner wall of the tube body and extend along the length direction of the tube body. The helical teeth include left-handed teeth and right-handed teeth. The left-handed teeth and the right-handed teeth have opposite directions of rotation. In a projection plane parallel to the length direction of the tube body, at least part of the projection of the left-handed teeth and the projection of the right-handed teeth overlap.

[0007] According to the embodiments of the present invention, the heat exchange tube with left-handed and right-handed teeth rotates in opposite directions, which intensifies the turbulence of the fluid inside the heat exchange tube, thus improving the heat exchange efficiency. Furthermore, since the projections of the left-handed and right-handed teeth overlap at least partially in a projection plane parallel to the length direction of the tube, the turbulence intensity is further increased, resulting in more thorough heat exchange within the heat exchange tube and improving its heat exchange efficiency.

[0008] In some embodiments, the junction of the left-hand helical tooth and the right-hand helical tooth has a smooth area and an overlapping area, the overlapping area of ​​the left-hand helical tooth and the right-hand helical tooth constitutes the overlapping area, and the inner wall surface of the smooth area is a smooth curved surface.

[0009] In some embodiments, along the length of the tube body, the length of the smooth area is L1, and the length of the overlapping area is L2, wherein 0 < L1 ≤ 2 mm, and 0 < L2 ≤ 20 mm.

[0010] In some embodiments, the parameters of the helical teeth satisfy at least one of the following conditions:

[0011] The helix angle of the helical teeth is β, where 15°≤β≤45°;

[0012] The spiral teeth are multiple and arranged sequentially along the circumference of the tube body. The number of spiral teeth is n, where 30≤n≤85.

[0013] The tooth tip angle of the helical teeth is α, where 10°≤α≤50°;

[0014] The tooth height of the helical teeth is H, where 0.1mm ≤ H ≤ 0.2mm;

[0015] The radius of the arc surface of the tooth tip angle of the spiral tooth is R1, where 0.02mm≤R1≤0.05mm;

[0016] The radius of the arc surface of the tooth root angle of the spiral tooth is R2, where 0.03mm≤R2≤0.05mm.

[0017] In some embodiments, there are multiple helical teeth arranged sequentially along the circumference of the tube body, and there is a tooth groove between two adjacent helical teeth. The width of the tooth groove gradually increases in the direction from the outer wall surface of the tube body to the inner wall surface of the tube body.

[0018] In some embodiments, the parameters of the tube body satisfy at least one of the following conditions:

[0019] The outer diameter of the tube is φ1, where 4mm≤φ1≤16mm;

[0020] The wall thickness of the tube is M, where 0.2mm ≤ M ≤ 0.3mm.

[0021] In some embodiments, there are multiple left-handed teeth and multiple right-handed teeth, and the multiple left-handed teeth and multiple right-handed teeth are arranged alternately along the length direction of the tube body.

[0022] In some embodiments, the length of a single left-handed tooth along the tube body is L3, and the length of a single right-handed tooth along the tube body is L4, wherein 5mm≤L3≤5000mm and 5mm≤L4≤5000mm.

[0023] In some embodiments, the heat exchange tube is a copper tube, which is integrally spun to form the tube body and the helical teeth.

[0024] Another embodiment of the heat exchanger of the present invention includes the heat exchange tube described in any one of the embodiments of the present invention.

[0025] According to the embodiments of the present invention, the heat exchanger, due to the opposite rotation directions of the left-hand and right-hand teeth, can make the turbulence of the fluid inside the heat exchange tube more intense, which is beneficial to improving the heat exchange effect of the heat exchange tube. Since the projections of the left-hand and right-hand teeth overlap at least partially in the projection plane parallel to the length direction of the tube body, the turbulence intensity of the fluid can be further increased, making the heat exchange of the fluid inside the heat exchange tube more complete, which is beneficial to improving the heat exchange efficiency of the heat exchanger. Attached Figure Description

[0026] Figure 1 This is a partial longitudinal cross-sectional view of the heat exchange tube according to an embodiment of the present invention.

[0027] Figure 2 This is a partial longitudinal cross-sectional view of the heat exchange tube according to another embodiment of the present invention.

[0028] Figure 3 This is a partial cross-sectional view of the heat exchange tube according to an embodiment of the present invention.

[0029] Figure label:

[0030] 1. Pipe body;

[0031] 2. Helical teeth; 21. Left-handed helical teeth; 22. Right-handed helical teeth; 23. Smooth area; 24. Overlapping area. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] The following is a reference appendix. Figures 1 to 3 This invention describes a heat exchange tube and a heat exchanger according to an embodiment of the present invention.

[0034] like Figure 1 and Figure 2 As shown, the heat exchange tube of this utility model embodiment includes a tube body 1 and a helical tooth 2. The helical tooth 2 is disposed on the inner wall of the tube body 1 and extends along the length direction of the tube body 1. The helical tooth 2 includes a left-handed tooth 21 and a right-handed tooth 22. The left-handed tooth 21 and the right-handed tooth 22 have opposite directions of rotation. In the projection plane parallel to the length direction of the tube body 1, at least part of the projection of the left-handed tooth 21 and the projection of the right-handed tooth 22 overlap.

[0035] According to the embodiment of the present invention, the heat exchange tube with left-handed teeth 21 and right-handed teeth 22 rotates in opposite directions, which makes the turbulence of the fluid inside the heat exchange tube more intense, thus improving the heat exchange effect of the heat exchange tube. Since the projections of left-handed teeth 21 and right-handed teeth 22 at least partially overlap in the projection plane parallel to the length direction of the tube body 1, the turbulence intensity of the fluid can be further increased, making the heat exchange of the fluid inside the heat exchange tube more complete, which is beneficial to improving the heat exchange efficiency of the heat exchange tube.

[0036] Understandably, the inner wall of tube 1 has both left-handed teeth 21 and right-handed teeth 22. Because the left-handed teeth 21 and right-handed teeth 22 rotate in different directions, during the flow of the fluid (refrigerant) inside the tube, the fluid flows in a left-handed direction in the region of the left-handed teeth 21, and then in a right-handed direction when the fluid reaches the region of the right-handed teeth 22. In this process, the refrigerant flow is highly turbulent, resulting in thorough mixing and allowing heat to be transferred more quickly from the fluid to the outside of the tube. This increases the intensity of the refrigerant turbulence, thereby improving the heat transfer coefficient of the heat exchange tube and achieving a more efficient heat transfer effect.

[0037] In a projection plane parallel to the length direction of the tube body 1, the projections of the left-hand tooth 21 and the right-hand tooth 22 at least partially overlap. That is, the left-hand tooth 21 and the right-hand tooth 22 overlap in at least a portion of the tube body 1. As a result, when the fluid passes through this overlapping area, the turbulence intensity of the fluid can be further increased, making the heat exchange of the fluid in the heat exchange tube more complete.

[0038] Optionally, such as Figure 2 As shown, the junction of the left-hand tooth 21 and the right-hand tooth 22 has a smooth region 23 and an overlapping region 24. The overlapping area of ​​the left-hand tooth 21 and the right-hand tooth 22 constitutes the overlapping region 24, and the inner wall surface of the smooth region 23 is a smooth curved surface. It can be understood that the smooth region 23 is not spun, that is, the smooth region 23 is not provided with a left-hand tooth 21 or a right-hand tooth 22. This facilitates the conversion of the left-hand tooth 21 and the right-hand tooth 22 at the position of the smooth region 23 when processing the heat exchange tube.

[0039] like Figure 2As shown, along the length of the tube 1, the length of the smoothing region 23 is L1, and the length of the overlapping region 24 is L2, where 0 < L1 ≤ 2 mm and 0 < L2 ≤ 20 mm. It is understandable that the length of the smoothing region 23 is less than or equal to 2 mm. When the length of the smoothing region 23 is too long (greater than 2 mm), it will reduce the turbulence intensity of the fluid flowing inside the tube 1, thus reducing the heat exchange effect. When the length of the smoothing region 23 is less than or equal to 2 mm, it ensures that the left-handed tooth 21 and the right-handed tooth 22 can switch smoothly without adversely affecting the fluid flow inside the tube 1, which is beneficial for ensuring a more efficient heat exchange effect of the heat exchange tube. Furthermore, since the length of the overlapping region 24, L2, is less than or equal to 20 mm, the production cost of the heat exchange tube can be reduced.

[0040] For example, L1 can be 0.5mm, 1.5mm, or 2mm. L2 can be 1mm, 5mm, 10mm, 15mm, or 20mm.

[0041] Optionally, the helix angle of the helical tooth 2 is β, where 15°≤β≤45°. For example, β can be 15°, 20°, 25°, 30°, 35°, 40°, or 45°.

[0042] Through analysis of the heat transfer mechanism during evaporation and condensation, the inventors found that when the helix angle β of the helical teeth 2 meets the above parameter range, the fluid can rotate, causing the fluid in the pipe to generate a secondary flow different from the axial and radial flows, thereby increasing the turbulence intensity of the fluid and greatly promoting the improvement of the heat transfer coefficient of the heat exchange tube.

[0043] Optionally, such as Figure 3 As shown, there are multiple helical teeth 2, arranged sequentially along the circumference of the tube body 1. The number of teeth 2 is n, where 30 ≤ n ≤ 85. For example, the number of teeth n of the helical teeth 2 can be 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, or 85. By arranging the helical teeth 2 in the above-mentioned manner, the heat exchange tube of this embodiment can increase the number of vaporization nuclei, which is more conducive to heat exchange of the fluid, and makes the tooth pitch more reasonable, thereby improving the utilization rate of the tube material.

[0044] Optionally, such as Figure 3 As shown, the tip angle of the helical tooth 2 is α, where 10°≤α≤50°. For example, the tip angle α of the helical tooth 2 can be 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, or 50°. This allows for parameter optimization of the tip angle of the threaded tooth to further improve the heat exchange efficiency of the heat exchange tube.

[0045] Optionally, such as Figure 3As shown, the tooth height of the helical tooth 2 is H, where 0.1mm ≤ H ≤ 0.2mm. For example, the tooth height H of the helical tooth 2 can be 0.1mm, 0.12mm, 0.14mm, 0.16mm, 0.18mm, or 0.2mm. Therefore, the tooth height of the helical tooth 2 can be optimized to further improve the heat exchange efficiency of the heat exchange tube.

[0046] Optionally, the radius of the arc surface of the tip angle of the helical tooth 2 is R1, where 0.02mm ≤ R1 ≤ 0.05mm. For example, the radius of arc surface R1 of the tip angle of the helical tooth 2 can be 0.02mm, 0.03mm, 0.04mm, or 0.05mm. The radius of arc surface of the root angle of the helical tooth 2 is R2, where 0.03mm ≤ R2 ≤ 0.05mm. For example, the radius of arc surface R2 of the root angle of the helical tooth 2 can be 0.03mm, 0.04mm, or 0.05mm. This allows for parameter optimization of the tip angle and root angle of the helical tooth 2 to further improve the heat exchange effect of the heat exchange tube.

[0047] Optionally, there are multiple helical teeth 2, arranged sequentially along the circumference of the tube 1. Adjacent helical teeth 2 have grooves between them, and the width of the grooves gradually increases in the direction from the outer wall surface of the tube 1 towards the inner wall surface. It can be understood that the width of the groove is the distance between two adjacent helical teeth 2. Since the width of the grooves gradually increases in the direction from the outer wall surface of the tube 1 towards the inner wall surface, the contact area between the fluid and the inner wall of the tube 1 can be further increased, thereby improving the heat exchange effect of the heat exchange tube.

[0048] For example, in the projection plane orthogonal to the axis of the tube 1, the cross section of the tooth groove is trapezoidal.

[0049] Optionally, the outer diameter of the tube body 1 is φ1, where 4mm ≤ φ1 ≤ 16mm. For example, the outer diameter φ1 of the tube body 1 can be 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, or 16mm. The wall thickness of the tube body 1 is M, where 0.2mm ≤ M ≤ 0.3mm. For example, the wall thickness M of the tube body 1 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, or 0.3mm. This ensures that the heat exchange tube has sufficient structural strength and good heat exchange effect.

[0050] Optionally, such as Figure 1 and Figure 2As shown, there are multiple left-handed teeth 21 and multiple right-handed teeth 22, which are arranged alternately along the length of the tube 1. During the flow of the fluid (refrigerant) inside the tube, in the region of the left-handed teeth 21, the fluid flows in a left-handed direction. When the fluid reaches the region of the right-handed teeth 22, the refrigerant flows in a right-handed direction. In this process, the flow of the refrigerant is very turbulent, and the refrigerant is fully stirred and mixed, allowing heat to be transferred from the fluid to the outside of the tube more quickly. This increases the intensity of the refrigerant turbulence, thereby improving the heat transfer coefficient of the heat exchange tube and achieving a more efficient heat transfer effect.

[0051] Optionally, the length of a single left-handed tooth 21 along the tube body 1 is L3, and the length of a single right-handed tooth 22 along the tube body 1 is L4, wherein 5mm ≤ L3 ≤ 5000mm and 5mm ≤ L4 ≤ 5000mm. It is understood that the length L3 of a single left-handed tooth 21 along the tube body 1 can be arbitrarily selected between 5mm and 5000mm, and the length L4 of a single right-handed tooth 22 along the tube body 1 can be arbitrarily selected between 5mm and 5000mm.

[0052] It should be noted that heat exchange tubes can be processed continuously, with a processing weight of up to 1 ton and a processing length of 10,000m-30,000m.

[0053] Optionally, the heat exchange tube is made of copper tube, which is integrally spun to form tube body 1 and helical teeth 2, thereby further improving the heat exchange effect of the heat exchange tube, and having high structural strength and reliable operation.

[0054] Another embodiment of the heat exchanger of this utility model includes the heat exchange tube of this utility model. It is understood that the heat exchanger can be an evaporator or a condenser.

[0055] According to the embodiment of the present invention, the heat exchanger, due to the opposite rotation directions of the left-hand helical teeth 21 and the right-hand helical teeth 22, can make the turbulence of the fluid in the heat exchange tube more intense, which is beneficial to improving the heat exchange effect of the heat exchange tube. Since the projections of the left-hand helical teeth 21 and the right-hand helical teeth 22 at least partially overlap in the projection plane parallel to the length direction of the tube body 1, the turbulence intensity of the fluid can be further increased, making the heat exchange of the fluid in the heat exchange tube more complete, which is beneficial to improving the heat exchange efficiency of the heat exchanger.

[0056] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A heat exchange tube, characterized by, include: tube body(1); The spiral teeth (2) are disposed on the inner wall of the tube body (1) and extend along the length direction of the tube body (1). The spiral teeth (2) include a left-handed tooth (21) and a right-handed tooth (22). The left-handed tooth (21) and the right-handed tooth (22) have opposite directions of rotation. In a projection plane parallel to the length direction of the tube body (1), at least part of the projection of the left-handed tooth (21) and the projection of the right-handed tooth (22) overlap.

2. The heat exchange tube according to claim 1, wherein The junction of the left-hand helical tooth (21) and the right-hand helical tooth (22) has a smooth area (23) and an overlapping area (24). The overlapping area of ​​the left-hand helical tooth (21) and the right-hand helical tooth (22) constitutes the overlapping area (24). The inner wall of the smooth area (23) is a smooth curved surface.

3. The heat exchange tube according to claim 2, wherein Along the length direction of the tube body (1), the length of the smooth area (23) is L1, and the length of the overlapping area (24) is L2, wherein 0 < L1 ≤ 2 mm, and 0 < L2 ≤ 20 mm.

4. The heat exchange tube of claim 1, wherein The parameters of the helical teeth (2) must satisfy at least one of the following conditions: The helix angle of the helical tooth (2) is β, where 15°≤β≤45°; There are multiple spiral teeth (2), which are arranged sequentially along the circumference of the tube body (1). The number of teeth of the spiral teeth (2) is n, where 30≤n≤85. The tooth tip angle of the helical tooth (2) is α, where 10°≤α≤50°; The tooth height of the helical tooth (2) is H, wherein 0.1mm≤H≤0.2mm; The radius of the arc surface of the tooth tip angle of the spiral tooth (2) is R1, where 0.02mm≤R1≤0.05mm; The radius of the arc surface of the tooth root angle of the spiral tooth (2) is R2, where 0.03mm≤R2≤0.05mm.

5. The heat exchange tube of claim 1, wherein There are multiple helical teeth (2), which are arranged sequentially along the circumference of the tube (1). There is a tooth groove between two adjacent helical teeth (2). The width of the tooth groove gradually increases in the direction from the outer wall surface of the tube (1) to the inner wall surface of the tube (1).

6. The heat exchange tube of claim 1, wherein The parameters of the tube (1) must satisfy at least one of the following conditions: The outer diameter of the tube (1) is φ1, wherein 4mm≤φ1≤16mm; The wall thickness of the tube (1) is M, wherein 0.2mm≤M≤0.3mm.

7. The heat exchange tube of claim 1, wherein There are multiple left-handed teeth (21) and multiple right-handed teeth (22), and the multiple left-handed teeth (21) and multiple right-handed teeth (22) are arranged alternately along the length direction of the tube body (1).

8. The heat exchange tube of claim 7, wherein The length of a single left-handed tooth (21) along the tube body (1) is L3, and the length of a single right-handed tooth (22) along the tube body (1) is L4, wherein 5mm≤L3≤5000mm and 5mm≤L4≤5000mm.

9. The heat exchange tube according to any one of claims 1 to 8, characterized in that The heat exchange tube is a copper tube, which is integrally spun to form the tube body (1) and the helical teeth (2).

10. A heat exchanger, characterized by The heat exchange tube includes any one of claims 1-9.

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