Internal thread heat exchange tube, heat exchanger and air conditioner

Abstract

The utility model provides an internal thread heat exchange tube, a heat exchanger and an air conditioner. The internal thread heat exchange pipe comprises a pipe body, protruding thread teeth are arranged on the inner wall face of the pipe body, the thread teeth extend in the axial direction of the pipe body along a spiral line, the multiple thread teeth are arranged in the circumferential direction of the pipe body at intervals, and the tooth crests of the thread teeth are arc crests. According to the internal thread heat exchange tube, the tooth crests of the thread teeth are arranged to be the arc crests, and compared with the prior art that the tooth crests are sharp corners, the arc crests can increase the heat exchange area, and heat exchange is facilitated; and compared with the prior art that the tooth crests are flat crests, the area of the arc top is smaller, so that refrigerant disturbance in the heat exchange tube can be intensified, and heat exchange is enhanced. Therefore, according to the internal thread heat exchange tube, the effects of optimizing the heat exchange area and enhancing disturbance heat exchange can be achieved at the same time, and the heat exchange tube has high heat exchange efficiency.

Description

Technical Field

[0001] The present application belongs to the technical field of air conditioning, and in particular relates to an internally threaded heat exchange tube, a heat exchanger and an air conditioner. Background Art

[0002] The heat exchanger is a crucial component of air conditioners, directly impacting their heat transfer. After the refrigerant enters the heat exchange tubes, it exchanges heat with the outside air, achieving both cooling and heating effects. Currently, achieving high heat transfer efficiency in heat exchange tubes is a key research area in air conditioners. Utility Model Content

[0003] The embodiments of the present application provide an internally threaded heat exchange tube, a heat exchanger, and an air conditioner to achieve high heat exchange efficiency of the heat exchange tube.

[0004] In the first aspect, an embodiment of the present application provides an internally threaded heat exchange tube, which includes a tube body, and the inner wall surface of the tube body is provided with raised thread teeth, the thread teeth extend along a spiral line in the axial direction of the tube body, and multiple thread teeth are arranged at intervals along the circumference of the tube body, and the tooth top of the thread teeth is an arc top.

[0005] Optionally, the arc radius of the arc top is 0.057mm to 0.063mm.

[0006] Optionally, the outer diameter of the tube body is 6.9 mm; and / or the wall thickness of the tube body is 0.21 mm±0.002 mm.

[0007] Optionally, the tooth height of the thread teeth is 0.12mm±0.002mm.

[0008] Optionally, the helix angle of the thread teeth is 30°±2°.

[0009] Optionally, the top angle of the thread teeth is 20°±7°.

[0010] Optionally, the number of thread teeth is 55.

[0011] Optionally, the bottom width of the thread teeth is 0.15mm±0.005mm; and / or, a thread groove is formed between two adjacent thread teeth, and the width of the thread groove is 0.21mm±0.003mm; and / or, the connection between the thread teeth and the inner wall of the tube body is an arc transition, and the radius of the transition arc is 0.032mm~0.038mm.

[0012] In a second aspect, an embodiment of the present application further provides a heat exchanger, which includes the above-mentioned internally threaded heat exchange tube.

[0013] In a third aspect, an embodiment of the present application further provides an air conditioner, which includes the above-mentioned heat exchanger.

[0014] The internally threaded heat exchange tube, heat exchanger, and air conditioner provided in the embodiments of the present application utilize a circular arc top at the tooth tips of the internally threaded heat exchange tube. Compared to the prior art with pointed tooth tips, the circular arc top increases the heat exchange area, facilitating heat exchange. Furthermore, compared to the prior art with flat tooth tips, the circular arc top has a smaller area, thereby exacerbating refrigerant disturbance within the heat exchange tube and enhancing heat exchange. Therefore, the internally threaded heat exchange tube of the present application can simultaneously optimize the heat exchange area and enhance disturbance heat exchange, resulting in a high heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are merely some embodiments of this application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. In the following description, the same reference numerals represent the same parts.

[0016] Figure 1 This is a schematic radial cross-sectional view of the internally threaded heat exchange tube provided in an embodiment of the present application.

[0017] Figure 2 for Figure 1 The enlarged structural schematic diagram of the part A of the internally threaded heat exchange tube is shown.

[0018] Figure 3 This is a schematic axial cross-sectional view of the internally threaded heat exchange tube provided in an embodiment of the present application.

[0019] Figure 4 A comparison chart of the heat transfer coefficients of the internally threaded heat exchange tube provided in the embodiment of the present application and the existing heat exchange tube.

[0020] Description of Figure Numbers:

[0021] 100. Internally threaded heat exchange tube; 110. Tube body; 120. Thread teeth; 130. Thread groove. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0023] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0024] In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0025] The embodiment of the present application provides an internally threaded heat exchange tube 100, such as Figures 1 to 3 As shown, the internally threaded heat exchange tube 100 includes a tube body 110, and the inner wall surface of the tube body 110 is provided with raised thread teeth 120, and the thread teeth 120 extend along a spiral line in the axial direction of the tube body 110. Multiple thread teeth 120 are arranged at intervals along the circumference of the tube body 110, and the tooth top of the thread tooth 120 is an arc top (that is, the tooth top surface of the thread tooth 120 is an arc surface).

[0026] The internally threaded heat exchange tube 100 provided in the embodiment of the present application utilizes a circular top configuration for the tooth tips 120. Compared to existing technologies with pointed tops, the circular tops increase the heat exchange area, facilitating heat exchange. Furthermore, compared to existing technologies with flat tops, the circular tops have a smaller area, thereby increasing refrigerant turbulence within the heat exchange tube and enhancing heat exchange. Therefore, the internally threaded heat exchange tube 100 of the present application can simultaneously optimize the heat exchange area and enhance turbulent heat exchange, resulting in a high heat exchange efficiency.

[0027] Specifically, the tube body 110 of the internally threaded heat exchange tube 100 is a hollow structure, and the thread teeth 120 are provided on the inner wall surface of the tube body 110. In this embodiment, the thread teeth 120 and the tube body 110 are an integral structure, and the internally threaded teeth 120 can be formed by machining or integral casting.

[0028] Optionally, the arc radius R1 of the arc top is 0.057 mm to 0.063 mm. For example, the arc radius R1 of the arc top can be 0.057 mm, 0.058 mm, 0.059 mm, 0.06 mm, 0.061 mm, 0.062 mm, or 0.063 mm, etc., and can be set according to actual needs. By setting the arc radius R1 of the arc top of the thread teeth 120 to 0.057 mm to 0.063 mm, the internally threaded heat exchange tube 100 can have better heat exchange efficiency.

[0029] Optionally, the outer diameter D of the tube body 110 is 6.9 mm. By setting the outer diameter D of the tube body 110 to 6.9 mm, high heat exchange efficiency can be achieved while reducing the weight per meter of the internally threaded heat exchange tube 100 to lower costs. It is understood that, in theory, the larger the outer diameter D of a heat exchange tube, the better the heat exchange performance. However, compared to a heat exchange tube with an outer diameter D of 7 mm, the internally threaded heat exchange tube 100 of the present application has a smaller outer diameter D and actually improves heat exchange efficiency.

[0030] Optionally, the wall thickness t of the tube body 110 is 0.21mm±0.002mm, which is also the bottom wall thickness of the internally threaded heat exchange tube 100. For example, the wall thickness t of the tube body 110 can be 0.208mm, 0.209mm, 0.21mm, 0.211mm, or 0.212mm, etc., and can be set according to actual needs. It is understood that by appropriately reducing the outer diameter D of the tube body 110 of the internally threaded heat exchange tube 100 while maintaining the wall thickness t of the internally threaded heat exchange tube 100, the meter weight of the heat exchange tube can be reduced, thereby reducing the manufacturing cost of the heat exchange tube.

[0031] Optionally, the tooth height h of the thread teeth 120 is 0.12mm±0.002mm, and the tooth height h of the thread teeth 120 refers to the maximum height of the thread teeth 120 protruding from the inner wall surface of the tube body 110. Exemplarily, the tooth height h of the thread teeth 120 can be 0.118mm, 0.119mm, 0.12mm, 0.121mm or 0.122mm, etc., and can be set according to actual needs. By optimizing the tooth height parameters of the thread teeth 120, when the tooth height h is large, the contact area between the refrigerant and the internal threaded heat exchange tube 100 can be increased, so that the heat exchange internal surface area inside the internal threaded heat exchange tube 100 is larger, thereby improving the heat exchange efficiency of the internal threaded heat exchange tube 100 and enhancing the heat transfer effect of the internal threaded heat exchange tube 100.

[0032] Optionally, the helix angle α of the thread teeth 120 is 30°±2°, and the helix angle α refers to the angle between the inclination direction of the thread teeth 120 and the axial direction of the tube body 110. The helix angle α enables the refrigerant to be guided and move along the spiral direction. Exemplarily, the helix angle α of the thread teeth 120 can be 28°, 29°, 30°, 31° or 32°, etc., and can be set according to actual needs. By optimizing the helix angle α of the thread teeth 120 to 30°±2°, the refrigerant in the internally threaded heat exchange tube 100 generates a secondary flow different from the radial direction, the turbulence intensity is increased, and the convective heat transfer during evaporation and condensation is enhanced, so that the internally threaded heat exchange tube 100 has a higher heat exchange efficiency.

[0033] Optionally, the tooth top angle β of the thread tooth 120 is 20°±7°, and the tooth top angle β refers to the angle formed by the two sides of the thread tooth 120. Exemplarily, the tooth top angle β of the thread tooth 120 can be 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26° or 27°, etc., and can be set according to actual needs. By setting the tooth top angle β of the thread tooth 120 to 20°±7°, the smaller tooth top angle increases the contact area between the refrigerant and the thread tooth 120, which is beneficial to increase the heat exchange area of the inner surface of the internal threaded heat exchange tube 100, thereby improving the heat exchange efficiency of the internal threaded heat exchange tube 100.

[0034] Optionally, the number of thread teeth 120 is 50 to 60, for example, the number of thread teeth 120 may be 50, 51, 51, 52, 53, 54, 55, 56, 57, 58, 59, or 60. Specifically, the number of thread teeth 120 determines its density. The more thread teeth 120 there are, the denser the thread teeth 120 are; the fewer thread teeth 120 there are, the sparser the thread teeth 120 are.

[0035] Optionally, the tooth bottom width W1 of the thread tooth 120 is 0.15mm±0.005mm. For example, the tooth bottom width W1 of the thread tooth 120 can be 0.145mm, 0.145mm, 0.147mm, 0.148mm, 0.149mm, 0.15mm, 0.151mm, 0.152mm, 0.153mm, 0.154mm or 0.155mm, etc., which can be set according to actual needs.

[0036] Optionally, a thread groove 130 is formed between two adjacent thread teeth 120, and the width W2 of the thread groove 130 (i.e., the distance between two adjacent thread teeth 120) is 0.21 mm ± 0.003 mm. For example, the tooth height h of the thread teeth 120 can be 0.207 mm, 0.208 mm, 0.209 mm, 0.21 mm, 0.211 mm, 0.212 mm, or 0.213 mm, etc., and can be set according to actual needs.

[0037] Optionally, the connection between the thread teeth 120 and the inner wall of the tube body 110 is an arc transition, and the radius R2 of the transition arc is 0.032mm to 0.038mm. For example, the radius R2 of the transition arc can be 0.032mm, 0.033mm, 0.034mm, 0.035mm, 0.036mm, 0.037mm or 0.038mm, etc., and can be set according to actual needs. By setting the connection between the thread teeth 120 and the inner wall of the tube body 110 as an arc transition, a smoother refrigerant flow path can be provided, which helps to reduce resistance and noise during the refrigerant flow process.

[0038] See Table 1 below, which compares the parameters of the internally threaded heat exchange tube 100 of the prior art and this embodiment. Compared to the prior art, the outer diameter D of the internally threaded heat exchange tube 100 of this embodiment is 0.1 mm smaller, the wall thickness t is 0.01 mm smaller, the tooth height h of the thread teeth 120 is 0.02 mm larger, the tooth top angle β is 12° smaller, the helix angle α is 14° larger, the number of thread teeth 120 is reduced by 10, the tooth bottom width W1 is 0.015 mm larger, the width W2 of the thread groove 130 is 0.03 mm larger, the transition arc radius R2 is 0.01 mm smaller, and the arc top radius R1 is 0.005 mm larger. Among them, increasing the helix angle α can cause the refrigerant in the heat exchange tube to produce a secondary flow that is different from the radial direction of the tube body 110, increase the turbulence intensity, and enhance the convective heat transfer effect during heat exchange, thereby improving the heat exchange efficiency. At the same time, increasing the tooth height h and tooth top arc radius R1 of the thread teeth 120 can increase the inner surface area of the internally threaded heat exchange tube 100, that is, increase the heat exchange area, which helps to improve the heat exchange efficiency. Although the tooth height h and tooth top arc radius R1 of the thread teeth 120 in this embodiment are increased, the number of thread teeth 120 is reduced by 10, and the radius R2 of the transition arc is reduced by 0.01mm, which effectively reduces the weight of the internally threaded heat exchange tube 100. In general, the gram per meter weight of the internally threaded heat exchange tube 100 of this embodiment is reduced by 3g / m compared to the prior art, which reduces the cost and also helps to achieve lightweight heat exchanger.

[0039] Table 1

[0040] parameter Existing technology This embodiment Outer diameter (mm) 7 6.9 Wall thickness (mm) 0.22±0.002 0.21±0.002 Tooth height (mm) 0.1±0.002 0.12±0.002 Tooth tip angle (°) 32±7 20±7 Helix angle (°) 16±2 30±2 Number of racks 65 55 Tooth bottom width (mm) 0.135±0.005 0.15±0.005 Thread groove width (mm) 0.18±0.003 0.21±0.003 Transition arc radius (mm) 0.045 0.035 Tooth tip arc radius (mm) 0.055 0.06 Gram weight per meter (g / m) 46.6 43.6

[0041] See also Figure 4 As shown in Table 2, the applicant conducted a comparative experiment on the heat transfer coefficient of the internally threaded heat exchange tube 100 of this embodiment and the heat exchange tube of the prior art. Figure 4 Figure 2 is a comparison chart of the heat transfer coefficients of the internally threaded heat exchange tube 100 of this embodiment and the existing heat exchange tube, and Table 3 is a comparison table of the heat transfer coefficients of the internally threaded heat exchange tube 100 of this embodiment and the existing heat exchange tube. Figure 4 From Table 2, we can see that when the refrigerant flow rate is 200Kg / m 2 *s~450Kg / m 2 *s, the heat transfer coefficient inside the tube of the internally threaded heat exchange tube 100 of this embodiment is higher than the heat transfer coefficient inside the tube of the existing heat exchange tube, and the heat transfer coefficient inside the tube is increased by an average of 91.6%.

[0042] Table 2

[0043]

[0044]

[0045] The present application also provides a heat exchanger comprising an internally threaded heat exchange tube 100. The specific structure of the internally threaded heat exchange tube 100 is similar to that of the aforementioned embodiments. Since the present heat exchanger utilizes all of the technical solutions of all of the aforementioned embodiments, it possesses at least all of the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and therefore, no further details will be given here.

[0046] The present application also provides an air conditioner including a heat exchanger. The specific structure of the heat exchanger is described in the above embodiments. Since the present air conditioner adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0047] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0048] The above is a detailed introduction to the internally threaded heat exchange tube, heat exchanger and air conditioner provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An internally threaded heat exchange tube, characterized in that: The internally threaded heat exchange tube (100) comprises a tube body (110), wherein the inner wall surface of the tube body (110) is provided with raised thread teeth (120), wherein the thread teeth (120) extend along a spiral line in the axial direction of the tube body (110), and a plurality of the thread teeth (120) are arranged at intervals along the circumference of the tube body (110), and the tooth tops of the thread teeth (120) are arc tops.

2. The internally threaded heat exchange tube according to claim 1, characterized in that: The arc radius of the arc top is 0.057mm to 0.063mm.

3. The internally threaded heat exchange tube according to claim 1, characterized in that: The outer diameter of the tube (110) is 6.9 mm; And / or, the wall thickness of the tube body (110) is 0.21 mm ± 0.002 mm.

4. The internally threaded heat exchange tube according to claim 1, characterized in that: The tooth height of the thread teeth (120) is 0.12 mm ± 0.002 mm.

5. The internally threaded heat exchange tube according to claim 1, characterized in that: The helix angle of the thread teeth (120) is 30°±2°.

6. The internally threaded heat exchange tube according to claim 1, characterized in that: The tooth top angle of the thread teeth (120) is 20°±7°.

7. The internally threaded heat exchange tube according to claim 1, characterized in that: The number of the thread teeth (120) is 55.

8. The internally threaded heat exchange tube according to claim 1, characterized in that: The tooth bottom width of the thread teeth (120) is 0.15 mm ± 0.005 mm; and / or, a thread groove (130) is formed between two adjacent thread teeth (120), and the width of the thread groove (130) is 0.21 mm ± 0.003 mm; And / or, the connection between the thread teeth (120) and the inner wall surface of the tube body (110) is an arc transition, and the radius of the transition arc is 0.032mm to 0.038mm.

9. A heat exchanger, characterized in that: The heat exchanger comprises the internally threaded heat exchange tube (100) according to any one of claims 1 to 8.

10. An air conditioner, characterized in that: The air conditioner includes the heat exchanger according to claim 9.

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