Inclined high-low combined tooth internal thread pipe

Abstract

The utility model discloses an inclined high-low combined tooth internal thread pipe, which is characterized in that thread teeth on the inner side of a pipe body at least comprise a group of inclined high-low combined teeth, the inclined high-low combined teeth at least comprise a high tooth profile and a low tooth profile, meanwhile, the high tooth profile and the low tooth profile are distributed on the inner side of the pipe body in an inclined manner, and the tooth heights are not equal; the high tooth profiles and the low tooth profiles are configured to be continuously or discontinuously distributed at intervals, the addendum angles of the high tooth profiles and the low tooth profiles are fillets, and the helical angles of the high tooth profiles and the low tooth profiles are the same or different, so that a plurality of inclined circular teeth which are alternately distributed and are different in height are formed on the inner side of the pipe body, a medium flowing channel is enlarged, and the contact area between the internal threaded pipe and a medium is increased; compared with the prior art, the inner threaded pipe has the advantages that large resistance to flowing of media in the pipe body is avoided, sufficient turbulent flow effect can be achieved, turbulent flow effect of the media is enhanced through difference of different tooth heights, and accordingly heat transfer efficiency of the inner threaded pipe is improved.

Description

Technical Field

[0001] This utility model relates to the field of internal threaded tube technology, specifically to an internal threaded tube with high-efficiency heat exchange. Background Technology

[0002] The heat exchange aluminum tubes of air conditioner heat exchangers are usually threaded tubes. The inner side of the threaded tube has helical thread teeth, which has a large heat transfer area and a high degree of disturbance at the gas-liquid interface, resulting in high heat transfer efficiency.

[0003] Chinese Patent No. CN 204787989 U discloses a straight-tooth high-low tooth internal thread heat transfer tube, including a tube body. The inner wall of the tube body is provided with parallel straight teeth. The length of the straight teeth extends along the axial direction of the tube body, the height of the straight teeth extends along the radial direction of the tube body, the cross-section of the tooth tip of the straight teeth is a straight line, and multiple grooves are provided at intervals on the side of the straight teeth. The length of the grooves extends along the axial direction of the tube body, the width of the grooves extends along the radial direction of the tube body, and the depth of the grooves extends along the circumference of the tube body. The straight teeth include high teeth and low teeth arranged at intervals.

[0004] However, the internally threaded tube provided by the above solution, with its regularly arranged straight teeth, will increase the resistance to the flow of the medium inside the internally threaded tube, resulting in a decrease in the flow velocity of the medium inside the internally threaded tube. At the same time, it will also reduce the mixing degree and turbulence effect of the medium inside the internally threaded tube, making the medium flow unstable and thus affecting the heat transfer efficiency of the internally threaded tube.

[0005] Therefore, how to effectively improve the turbulence effect of the medium inside the internal threaded tube and improve the heat transfer efficiency of the internal threaded tube has become an urgent problem to be solved in this field. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an inclined high and low combined tooth internal threaded tube with several good turbulence effect and high heat transfer efficiency.

[0007] To achieve the above objectives, the present invention provides an inclined high-low combined tooth internal threaded pipe, comprising a pipe body, wherein threaded teeth are formed on the inner side of the pipe body.

[0008] The thread teeth include at least one set of inclined high-low combination teeth, wherein the inclined high-low combination teeth include at least one high tooth profile and one low tooth profile.

[0009] The high and low tooth profiles are obliquely distributed inside the tube body, and the tooth heights are not equal. The high and low tooth profiles are arranged in a continuous or discontinuous interval distribution. The tooth tip angles of the high and low tooth profiles are rounded. The helix angles of the high and low tooth profiles are the same or different.

[0010] Furthermore, the inclined high-low combination tooth includes a high tooth profile and a low tooth profile distributed adjacent to each other.

[0011] Furthermore, the inclined high-low combination tooth includes one high tooth profile and two continuously distributed low tooth profiles.

[0012] Furthermore, the inclined high-low combination tooth includes two continuously distributed high tooth profiles and one low tooth profile.

[0013] Furthermore, the tooth height of the high tooth profile and the low tooth profile is 0.1-0.3 mm.

[0014] Furthermore, the height difference between the high tooth profile and the low tooth profile is 0.02-0.15 mm.

[0015] Furthermore, the inclination angle between the high tooth profile and the low tooth profile is 10°-30°.

[0016] Furthermore, the tooth tip angle of the high tooth profile and the low tooth profile is 15°-53°.

[0017] Furthermore, the helix angle between the high-tooth profile and the low-tooth profile is 2°-55°.

[0018] Furthermore, the tooth roots of the high-tooth profile and the low-tooth profile are arc-shaped.

[0019] The inclined high-low combined tooth internal threaded tube provided by this utility model has at least one set of inclined high-low combined teeth on the inner side of the tube body. The inclined high-low combined teeth include at least one high tooth profile and one low tooth profile. At the same time, the high tooth profile and the low tooth profile are inclinedly distributed on the inner side of the tube body, and the tooth heights are not equal. The high tooth profile and the low tooth profile are arranged in a continuous or discontinuous interval distribution. The tooth tip angle of the high tooth profile and the low tooth profile is rounded. The helix angle of the high tooth profile and the low tooth profile is the same or different, so that several alternating inclined round teeth with different heights are formed on the inner side of the tube body. This increases the medium flow channel, increases the contact area between the internal threaded tube and the medium, does not cause a large resistance to the flow of the medium in the tube body, and can play a sufficient turbulence role. At the same time, the difference in tooth height enhances the turbulence effect of the medium, thereby improving the heat transfer efficiency of the internal threaded tube. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 A cross-sectional view of the inclined high and low combined tooth internal thread pipe provided by this utility model;

[0022] Figures 2 to 4 This is a schematic diagram of the distribution and arrangement of high-tooth and low-tooth profiles in this utility model;

[0023] Figure 5 This is a schematic diagram of the tooth height, tooth tip angle, and tilt angle of the high tooth profile and the low tooth profile in this utility model. Attached image description:

[0025] 1. Tube body; 2. Inclined high and low combination teeth; 21. High tooth profile; 22. Low tooth profile. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0027] Combination Figure 1 and Figure 2 The image shows an example of an inclined high-low combined tooth internal threaded pipe provided by this utility model.

[0028] As shown in the figure, the inclined high and low combined tooth internal threaded pipe of this example includes a pipe body 1, and the inner side of the pipe body 1 is formed with threaded teeth. The threaded teeth include at least one set of inclined high and low combined teeth 2, and the inclined high and low combined teeth 2 includes at least one high tooth profile 21 and one low tooth profile 22.

[0029] High tooth profile 21 and low tooth profile 22 are obliquely distributed on the inner side of the tube body 1, and the tooth heights are not equal. The high tooth profile 21 and low tooth profile 22 are arranged in a continuous or discontinuous interval distribution. The tooth tip angles of the high tooth profile 21 and low tooth profile 22 are rounded. The helix angles of the high tooth profile 21 and low tooth profile 22 are the same or different, so that several alternating oblique round teeth of different heights are formed on the inner side of the tube body 1, which effectively improves the turbulence effect of the medium inside the tube body 1, thereby improving the heat transfer efficiency.

[0030] Furthermore, the high tooth profile 21 and low tooth profile 22 in the inclined high and low combination tooth 2 can be configured into various continuous or discontinuous interval distribution structures according to specific application conditions.

[0031] Combination Figure 2 In some embodiments, the inclined high-low combination teeth 2 include an adjacent high tooth profile 21 and a low tooth profile 22, such that the high tooth profile 21 and the low tooth profile 22 are alternately distributed. When the inclined high-low combination teeth 2 are continuously distributed on the inner side of the tube body 1, the inner side of the tube body 1 forms a continuous alternation of high tooth profile 21 and low tooth profile 22, presenting a high-low arrangement structure. When the medium in the tube body 1 flows through the high tooth profile 21 and the low tooth profile 22, the sudden change in tooth height will increase the ability to pierce the liquid film of the medium, making the heat exchange between the medium and the inner surface of the tube body 1 more sufficient. At the same time, the heat exchange area between the medium and the inner surface of the tube body 1 will change abruptly, thereby enhancing the turbulence of the medium and improving the heat transfer efficiency.

[0032] Combination Figure 3In some embodiments, the inclined high-low combination tooth 2 includes a high tooth profile 21 and two continuously distributed low tooth profiles 22. When the inclined high-low combination tooth 2 is continuously distributed on the inner side of the tube body 1, the inner side of the tube body 1 forms a continuously spaced high tooth profile 21 and low tooth profile 22, and there are two continuous low tooth profiles 22 between two adjacent high tooth profiles 21 to present a one-high-two-low arrangement structure. This allows the medium in the tube body 1 to flow through a high tooth profile 21 and two continuous low tooth profiles 22, forming a more complex flow path in the tube body 1. At the same time, when the medium flows from a high tooth profile 21 to two continuous low tooth profiles 22, the flow resistance and hydraulic loss of the medium will be reduced, thereby improving the uniformity of the medium distribution in the tube body 1 and improving the overall heat transfer effect of the medium in the tube body 1.

[0033] Combination Figure 4 In some embodiments, the inclined high-low combination tooth 2 includes two continuously distributed high tooth profiles 21 and one low tooth profile 22, such that when the inclined high-low combination tooth 2 is continuously distributed on the inner side of the tube body 1, the inner side of the tube body 1 forms continuously spaced high tooth profiles 21 and low tooth profiles 22, and two adjacent low tooth profiles 22 are spaced apart by two continuous high tooth profiles 21 to present a two-high-one-low arrangement structure, so that when the medium flows through the two continuous high tooth profiles 21 and one low tooth profile 22 in the tube body 1, the thermal boundary layer between the medium and the inner wall of the tube body 1 will be rapidly destroyed, thereby enhancing the turbulence of the medium and making the medium flow more violently, thereby enhancing the heat transfer efficiency between the medium and the inner wall of the tube body 1.

[0034] Therefore, the high tooth profile 21 and low tooth profile 22 in the inclined high and low combined tooth 2 can be configured in different distribution patterns according to specific applications to improve the turbulence effect of the medium in the tube 1, thereby improving the heat transfer efficiency.

[0035] Combination Figure 5 Furthermore, in this example, the tooth height h of the high tooth profile 21 and the low tooth profile 22 is configured to be 0.1-0.3 mm, and the height difference between the high tooth profile 21 and the low tooth profile 22 is configured to be 0.02-0.15 mm. This controls the tooth height and height difference of the high tooth profile 21 and the low tooth profile 22 within a suitable range, ensuring that the tooth height and height difference of the high tooth profile 21 and the low tooth profile 22 can effectively cooperate to improve the turbulence effect of the medium. At the same time, when the pipe body 1 expands, the tooth height and height difference will not be too large, making the high tooth profile 21 and the low tooth profile 22 less likely to be damaged.

[0036] To improve the turbulence of the medium inside the tube 1, both the high-tooth profile 21 and the low-tooth profile 22 are inclinedly distributed on the inner side of the tube 1. Preferably, the high-tooth profile 21 and the low-tooth profile 22 are distributed with the same inclination angle α to improve the tightness of the fit between the medium and the high-tooth profile 21 and the low-tooth profile 22. The inclination angle α is configured to be 10°-30°, so that the medium generates swirling flow inside the tube 1 to reduce the flow resistance and energy loss of the medium and enhance the turbulence of the fluid. At the same time, the swirling flow can also destroy the film effect of the medium in the heat transfer process and promote nucleation boiling, thereby improving the heat transfer efficiency.

[0037] Furthermore, the tooth tip angle β of the high tooth profile 21 and the low tooth profile 22 is rounded, and the tooth root is preferably configured as an arc, so that the high tooth profile 21 and the low tooth profile 22 are smoothly connected. This can reduce the resistance when the medium flows, and at the same time, it can effectively reduce stress concentration, improve the strength and durability of the high tooth profile 21 and the low tooth profile 22. When the tube body 1 is under pressure, the high tooth profile 21 and the low tooth profile 22, with rounded tooth tip angle β and tooth root transition, make the stress distribution more uniform and reduce the risk of damage caused by excessive local stress.

[0038] If the tooth tip angle β is too small, the anti-expansion tube strength of the high tooth profile 21 and the low tooth profile 22 will decrease, making them prone to damage and deformation. If the tooth tip angle β is too large, the heat exchange area between the medium and the inner surface of the tube body 1 will decrease, affecting the heat transfer efficiency. Therefore, in this example, the tooth tip angle β is configured to be 15°-53°, so that the tooth tip angle β of the high tooth profile 21 and the low tooth profile 22 is within a suitable range, which can effectively increase the heat exchange area and improve the heat transfer efficiency.

[0039] See Figure 1 Furthermore, the high tooth profile 21 and the low tooth profile 22 are distributed on the inner side of the tube body 1 with a helix angle θ. The helix angle θ allows the medium to rotate inside the tube body 1, causing the medium inside the tube body 1 to generate a secondary flow different from the radial flow, increasing the intensity of turbulence and thus enhancing heat transfer. As the helix angle θ increases, the heat transfer coefficient of the medium also increases. However, as the helix angle θ increases, the energy loss of the medium also increases. Therefore, in this example, the helix angle of the high tooth profile 21 and the low tooth profile 22 is configured to be 2°-55°, so that the medium can flow through the high tooth profile 21 and the low tooth profile 22 and rotate, increasing the heat transfer coefficient without increasing energy loss, thus ensuring high heat transfer efficiency.

[0040] In some embodiments, the high tooth profile 21 and the low tooth profile 22 are distributed on the inner side of the tube body 1 with the same helix angle, which makes the flow state of the medium flowing through the high tooth profile 21 and the low tooth profile 22 more stable, which is beneficial to improving the heat exchange efficiency.

[0041] In some embodiments, the high tooth profile 21 and the low tooth profile 22 are distributed on the inner side of the tube body 1 with different helix angles, so that the high tooth profile 21 and the low tooth profile 22 with different helix angles can adapt to different two-phase flow patterns in the tube body 1, such as laminar flow or wavy flow, so that the laminar flow or wavy flow can cover the inner surface of the tube body 1 through the high tooth profile 21 and the low tooth profile 22, thereby increasing the heat exchange area and improving the heat transfer efficiency.

[0042] The inclined high-low combination teeth 2 thus formed presents a variety of distribution and arrangement structures through the high tooth profile 21 and the low tooth profile 22. The threaded teeth on the inner side of the tube body 100 include at least one set of inclined high-low combination teeth 2, so that the high tooth profile 21 and the low tooth profile 22 can cooperate with each other to improve the turbulence effect and heat transfer efficiency of the medium in the tube body 1.

[0043] In some embodiments, several sets of inclined high and low combined teeth 2 can be continuously distributed on the inner side of the tube body 1, so that the inner side of the tube body 1 is continuously distributed with high tooth profile 21 and low tooth profile 22, so as to ensure the turbulence effect and heat transfer efficiency of the medium.

[0044] In some embodiments, several sets of inclined high and low combination teeth 2 can also be distributed at intervals on the inner side of the pipe body 1, and straight tooth threads can be distributed between adjacent sets of inclined high and low combination teeth 2, so that high tooth profile 21, low tooth profile 22 and straight tooth threads are distributed at intervals on the inner side of the pipe body 1, so as to make the flow path of the medium more complex, thereby increasing the intensity of medium turbulence and improving the turbulence effect.

[0045] The inclined high and low combined tooth internal threaded pipe provided by this utility model can effectively reduce the flow resistance of the medium in the pipe body 1 and improve the turbulence effect and heat transfer efficiency by the cooperation of the high tooth profile 21 and the low tooth profile 22 of the inclined high and low combined tooth 2.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pipe with inclined high-low combination thread, comprising a pipe body, and thread teeth formed on the inner side of the pipe body, characterized in that the thread teeth comprise at least one set of inclined high-low combination teeth, the inclined high-low combination teeth comprise at least one high tooth profile and one low tooth profile, the high tooth profile and the low tooth profile are inclinedly distributed on the inner side of the pipe body, and the tooth heights are not equal, the high tooth profile and the low tooth profile are configured to be continuously or discontinuously spaced, the tooth tip angles of the high tooth profile and the low tooth profile are rounded, and the helix angles of the high tooth profile and the low tooth profile are the same or different. the inclined high-low combination teeth comprise one high tooth profile and one low tooth profile which are adjacently distributed.

2. The angle and elevation combination gage thread pipe as claimed in claim 1, wherein, the inclined high-low combination teeth comprise one high tooth profile and two low tooth profiles which are continuously distributed.

3. The angle and elevation combination gage thread pipe as claimed in claim 1, wherein, the inclined high-low combination teeth comprise two high tooth profiles and one low tooth profile which are continuously distributed.

4. The angle and elevation combination gage pipe as defined in claim 1 wherein, the tooth heights of the high tooth profile and the low tooth profile are 0.1-0.3 mm.

5. The angle and elevation combination gage thread pipe as claimed in claim 1, wherein, the height difference of the tooth heights of the high tooth profile and the low tooth profile is 0.02-0.15 mm.

6. The angle and elevation combination gage pipe according to claim 5, wherein, the inclination angle of the high tooth profile and the low tooth profile is 10°-30°.

7. The angle and elevation combination gage thread pipe as claimed in claim 1, wherein, the tooth tip angle of the high tooth profile and the low tooth profile is 15°-53°.

8. The angle and elevation combination gage thread pipe as claimed in claim 1, wherein, the helix angle of the high tooth profile and the low tooth profile is 2°-55°.

9. The angle and elevation combination gage thread pipe as claimed in claim 1, wherein, the tooth root of the high tooth profile and the low tooth profile is arc-shaped.

10. The angle and elevation combination gage thread pipe as claimed in claim 1, wherein, ​

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