Heat exchange tube

Abstract

The invention provides a heat exchange tube, and relates to the technical field of heat exchange. The heat exchange tube comprises a tube body and a drainage structure. The tube body is provided with a tube cavity, one end of the tube body in the axial direction is defined as a first end, the other end is defined as a second end, and the direction from the first end to the second end is defined as the flowing direction of fluid; the drainage structure is mounted on the wall of the tube cavity; in the axial direction of the tube body, at least one side, facing the first end, of the drainage structure is provided with a drainage surface, and the drainage surface extends in the direction from the first end to the second end; along the radial direction of the tube body, the drainage starting end of the drainage surface is closer to the cavity wall than the drainage tail end of the drainage surface. The drainage structure can enable fluid to flow in the extending direction of the drainage face, the fluid close to the cavity wall of the pipe body gradually flows to the middle of the pipe body, fluid disturbance is caused, rapid heat exchange between the fluid on the cavity wall of the pipe body and the fluid in the middle of the pipe cavity is facilitated, uniform change of the temperature of the fluid in the pipe body is promoted, and heat exchange efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat exchange tube. Background Art

[0002] Heat exchange tubes are one of the components of heat exchangers, used for heat exchange between media. When using traditional heat exchange tubes, the heat exchange effect of the fluid close to the wall of the heat exchange tube is good, while the heat exchange of the fluid at the center of the heat exchange tube cavity mainly depends on the heat exchange between the fluids, the heat exchange rate is slow, and a temperature difference is generated between the fluids, which is not conducive to the heat exchange process and affects the heat exchange efficiency. Summary of the invention

[0003] Based on this, it is necessary to provide a heat exchange tube to improve the heat exchange efficiency.

[0004] A heat exchange tube comprises a tube body and a drainage structure; the tube body is provided with a tube cavity, one end of the tube body along its own axial direction is defined as a first end, and the other end is defined as a second end, and the direction from the first end toward the second end is defined as the flow direction of the fluid; the drainage structure is installed on the cavity wall of the tube cavity; along the axial direction of the tube body, the drainage structure is provided with a drainage surface on at least one side facing the first end, and the drainage surface extends from the first end toward the second end; along the radial direction of the tube body, the drainage start end of the drainage surface is arranged closer to the cavity wall than the drainage end end of the drainage surface.

[0005] It can be understood that the drainage structure can make the fluid flow along the extension direction of the drainage surface, so that the fluid close to the tube body cavity wall gradually flows to the middle of the tube body, causing fluid disturbance, which is beneficial to the rapid heat exchange between the fluid at the tube body cavity wall and the fluid in the middle of the tube body, and promotes uniform change of the fluid temperature in the tube body. At the same time, the drainage structure also increases the heat exchange area, which is beneficial to improving the heat exchange efficiency.

[0006] In one embodiment, the drainage structure includes a first protrusion, one end of which is connected to the wall of the lumen, and the other end extends radially toward the middle of the tube body along the tube body; along the axial direction of the tube body, at least one side of the first protrusion facing the first end is set as the drainage surface.

[0007] It can be understood that the first protrusion is arranged to form a drainage surface so that the fluid at the cavity wall flows to the middle of the tube body, thereby promoting heat exchange and simplifying processing.

[0008] In one embodiment, the drainage structure includes a base and a first protrusion connected to the base, the base is connected to the wall of the tubular cavity, and the first protrusion extends radially toward the middle of the tube body along the radial direction of the tube body; along the axial direction of the tube body, at least one side of the first protrusion facing the first end is set as the drainage surface.

[0009] It can be understood that the arrangement of the base allows the first protrusion to protrude outward based on the base, thereby increasing the structural strength and facilitating installation on the wall of the lumen.

[0010] In one embodiment, the drainage surface is configured as an arc-shaped surface, and the curvature radius of the arc-shaped surface is r, where r≥5.

[0011] It can be understood that the arc-shaped surface enhances the drainage effect on the fluid, so that the fluid at the cavity wall reaches the middle of the tube body faster.

[0012] In one embodiment, the first protrusion is arranged to be gradually tapered along the radial direction of the tube body toward the middle of the tube body.

[0013] It can be understood that the tapered setting is conducive to forming a drainage surface. At the same time, the obstruction to the fluid flowing along the axial direction of the tube body near the middle of the tube body is reduced, which is conducive to the smooth flow of the fluid toward the second end.

[0014] In one of the embodiments, in the drainage structure, a plurality of first protrusions are provided, and the plurality of first protrusions are spaced apart along the axial direction of the tube body, and each of the first protrusions is correspondingly provided with at least one drainage surface.

[0015] It can be understood that the provision of multiple first protrusions is conducive to enhancing the effects of flow diversion and flow disturbance, and further improving the heat exchange efficiency.

[0016] In one of the embodiments, in the drainage structure, a plurality of the first protrusions are arranged in a staggered manner along the axial direction of the tube body.

[0017] It can be understood that the staggered arrangement of the first protrusions makes the disturbance effect on the fluid different, which can enhance the disturbance effect.

[0018] In one of the embodiments, in the drainage structure, along the radial direction of the tube body, the distance between the top of each first protrusion and the surface of the tube cavity wall where the base is connected is h, the tube diameter is R, h<R, and the distance between the root of the corresponding first protrusion and the surface of the tube cavity wall where the base is connected is t, 0.5mm≤t<h.

[0019] It can be understood that the root depths of the first protrusions are different, and the gap sizes formed between any two adjacent first protrusions are also different. The larger the gap space, the more bubble cores can be retained, which is conducive to the re-generation of bubbles and enhances the disturbance effect of the fluid.

[0020] In one embodiment, at least a portion of the first protrusions are provided with through holes penetrating the first protrusions.

[0021] It can be understood that the provision of through holes is conducive to reducing flow resistance, promoting fluid flow, and enhancing the turbulence effect.

[0022] In one of the embodiments, in each of the first protrusions having the through holes, the number of the through holes is n, and the n through holes are arranged at intervals, 2≤n≤10; wherein, at least two of the through holes have different aperture sizes.

[0023] It is understandable that the provision of multiple through holes further promotes fluid flow and enhances the disturbance effect. Furthermore, by providing through holes with different apertures, the fluid states at the through holes with different apertures are different, and the fluid disturbance is more severe.

[0024] In one embodiment, the drainage structure also includes a second protrusion; at least a portion of the first protrusions are connected to the second protrusion, and the second protrusion is arranged at an angle to the first protrusion; along the radial direction of the tube body, the second protrusion extends from the first protrusion toward the middle of the tube body.

[0025] It can be understood that the provision of the second protrusion can further enhance the spoiler effect based on the first protrusion.

[0026] In one embodiment, the angle between the first protrusion and the second protrusion is α, 0°<α≤60°.

[0027] It can be understood that this configuration ensures that the second protrusion faces the middle of the tube body and avoids interference with adjacent first protrusions as much as possible.

[0028] In one embodiment, there are multiple drainage structures, and the multiple drainage structures are arranged at intervals along the circumference of the tube body and / or along the axial direction of the tube body.

[0029] It is understandable that multiple drainage structures are provided to enhance the effects of flow disturbance and drainage, so as to improve the heat exchange efficiency.

[0030] In one embodiment, the plurality of drainage structures are arranged in a spiral pattern along the axial direction of the tube body; or, the drainage structures arranged in a circumferential direction of the tube body are formed into a drainage group, and the plurality of drainage groups are arranged in a axial direction of the tube body.

[0031] It can be understood that the spiral distribution of the drainage structure enables different angles of drainage on different cross-sections of the tube body, thereby enhancing the disturbance between the fluids and further promoting the heat exchange efficiency. Multiple drainage groups are arranged along the axial direction of the tube body, so that the fluid can be drained and disturbed every time it flows for a period of time along the flow direction of the fluid, which is beneficial to improving the heat exchange efficiency and is easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 A longitudinal cross-sectional view of a first embodiment of a heat exchange tube provided in the present application;

[0034] Figure 2 A transverse cross-sectional view of a second embodiment of a heat exchange tube provided in the present application;

[0035] Figure 3 A transverse cross-sectional view of a third embodiment of a heat exchange tube provided in the present application;

[0036] Figure 4 The drainage structure of the fourth embodiment of the heat exchange tube provided in the present application;

[0037] Figure 5 The drainage structure of the fifth embodiment of the heat exchange tube provided in the present application;

[0038] Figure 6 The drainage structure of the sixth embodiment of the heat exchange tube provided in the present application;

[0039] Figure 7 This is the drainage structure of the seventh embodiment of the heat exchange tube provided in the present application.

[0040] Figure numerals: 100, heat exchange tube; 10, tube body; 101, tube cavity; 102, first end; 103, second end; 20, drainage structure; 201, drainage surface; 202, gap; 21, first protrusion; 211, through hole; 22, base; 23, second protrusion. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0042] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not 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 at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0046] See also Figures 1 to 7 The present application provides a heat exchange tube 100, which includes a tube body 10 and a drainage structure 20; the tube body 10 is provided with a tube cavity 101, one end of the tube body 10 along its own axial direction is defined as a first end 102, and the other end is defined as a second end 103, and the direction from the first end 102 toward the second end 103 is defined as the flow direction of the fluid; the drainage structure 20 is installed on the cavity wall of the tube cavity 101; along the axial direction of the tube body 10, the drainage structure 20 is provided with a drainage surface 201 on at least one side facing the first end 102, and the drainage surface 201 extends from the first end 102 to the second end 103, and along the radial direction of the tube body 10, the drainage start end of the drainage surface 201 is arranged closer to the cavity wall than the drainage end end of the drainage surface 201.

[0047] That is, along the axial direction of the tube body 10, the drainage start end is relatively close to the first end 102, and the drainage end end is relatively close to the second end 103; along the radial direction of the tube body, the drainage start end is relatively close to the cavity wall of the tube body 10, and the drainage end end is relatively far from the cavity wall and close to the middle of the tube body 10. The drainage start end is the starting position of the drainage effect, and the drainage end end is the final position of the drainage effect, and the fluid flows from the drainage start end to the drainage end end along the drainage surface 201.

[0048] In this way, the fluid can flow from the first end 102 to the second end 103 of the tube body 10. In the process of the fluid flowing axially along the tube body 10, the drainage structure 20 can make the fluid near the wall of the lumen 101 flow toward the middle of the tube body 10 along the drainage surface 201. Since the fluid at the wall of the lumen 101 first exchanges heat with the external medium, when the fluid at the wall of the lumen 101 flows to the middle of the tube body 10, it can be mixed with the fluid in the middle of the tube body 10 to exchange heat, so that the temperature of the fluid in the lumen 101 is more uniform, which is conducive to the uniform increase or decrease of the fluid temperature. At the same time, the disturbance of the fluid is also enhanced, so that new fluid can exchange heat at the wall of the lumen 101, thereby improving the heat exchange efficiency.

[0049] like Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in an optional embodiment, the drainage surface 201 is configured as an arc-shaped curved surface, which facilitates the fluid to flow along the arc-shaped curved surface and enhances the drainage effect on the fluid.

[0050] In a further embodiment, the radius of curvature of the arcuate surface is r, where r≥5. In this way, the curvature of the arcuate surface is small, and the bending degree is small, so as to ensure that the formed guide surface 201 extends along the axial direction of the tube body 10 toward the second end 103 of the tube body 10, and guides the fluid at the cavity wall to flow into the tube body 10 while promoting the fluid to flow toward the second end 103. Exemplarily, r=5, 6 or 7.

[0051] like Figures 1 to 7As shown, in an optional embodiment, the drainage structure 20 includes a first protrusion 21, one end of the first protrusion 21 is connected to the wall of the lumen 101, and the other end extends toward the middle of the tube body 10; along the axial direction of the tube body 10, at least one side of the first protrusion 21 facing the first end 102 is set as a drainage surface 201. In this way, the first protrusion 21 is set to form the drainage surface 201, and the extension direction of the first protrusion 21 corresponds to the extension direction of the drainage surface 201, which is easy to process and manufacture. At the same time, the setting of the first protrusion 21 can destroy laminar flow, enhance disturbance, and thus enhance heat exchange. In some embodiments, the first protrusion 21 can be directly processed on the wall of the lumen 101, and the first protrusion 21 and the wall of the lumen 101 are integrally formed. In other embodiments, the first protrusion 21 can also be processed first, and then the first protrusion 21 is installed on the wall, which is more portable.

[0052] In some embodiments, the surface of the first protrusion 21 facing the first end 102 is set as a drainage surface 201. In other embodiments, the surfaces of the first protrusion 21 on both sides of the axial direction of the tube body 10 are set as drainage surfaces 201, so that the fluid on both sides of the first protrusion 21 can flow along the drainage surface 201 toward the middle of the tube body 10.

[0053] like Figures 4 to 7 As shown, in a further embodiment, the drainage structure 20 further includes a base 22 and a first protrusion 21 connected to the base 22, the base 22 is connected to the wall of the tube cavity 101, and the first protrusion 21 extends radially toward the middle of the tube body 10 along the tube body 10; along the axial direction of the tube body 10, at least one side of the first protrusion 21 facing the first end 102 is set as a drainage surface 201. In this way, it is more convenient to install the drainage structure 20, and the base 22 can be connected to the wall of the tube cavity 101, which is easy to operate. At the same time, the base 22 can provide stronger support for the first protrusion 21, which is conducive to improving the structural strength of the first protrusion 21.

[0054] Specifically, the material of the drainage structure 20 can be copper, aluminum, stainless steel, etc., depending on the processing technology and the material of the tube body 10. At the same time, the wall of the tube cavity 101 and the surface of the drainage structure 20 can also be coated with a corrosion-resistant coating to resist the corrosiveness of the fluid and extend the service life.

[0055] like Figures 4 to 7 As shown, in one embodiment, the first protrusion 21 is gradually arranged along the radial direction of the tube body 10 toward the middle of the tube body 10. In this way, on the basis of forming the guide surface 201, the fluid near the middle of the tube body 10 is less hindered from flowing along the axial direction of the tube body 10, which is conducive to the smooth flow of the fluid. At the same time, the extended end of the first protrusion 21 along the radial direction of the tube body 10 can form a sharp structure to break the laminar flow and promote fluid disturbance.

[0056] like Figure 1As shown, in some embodiments, in the drainage structure 20, the number of the first protrusion 21 is set to one, and the first protrusion 21 is correspondingly provided with at least one drainage surface 201, which has a simple structure and is easy to process and assemble.

[0057] like Figures 4 to 7 As shown, in a further embodiment, in the drainage structure 20, the number of the first protrusions 21 is multiple, and the multiple first protrusions 21 are arranged at intervals along the axial direction of the tube body 10, and each first protrusion 21 is correspondingly provided with at least one drainage surface 201. In this way, the provision of multiple first protrusions 21 further increases the heat exchange area, expands the gas-liquid interface and the boundary layer of the gas-liquid two-phase, enhances the drainage effect, causes a stronger disturbance of the fluid, and promotes heat exchange. In actual use, according to the different diameters of the tube body 10, the flow rate of the fluid in the radial cross section of the tube body 10 is different. The larger the diameter, the greater the fluid flow rate in the radial cross section of the tube body 10, and the more corresponding first protrusions 21 are provided to ensure the drainage effect.

[0058] like Figures 4 to 7 As shown, in some embodiments, in the drainage structure 20, along the axial direction of the tube body 10, multiple first protrusions 21 are arranged in a staggered manner. This arrangement is conducive to different first protrusions 21 having different drainage effects on the fluid, which can enhance the disturbance of the fluid to improve the heat exchange effect. In a specific embodiment, the staggered arrangement can be that multiple first protrusions 21 can be arranged in a staggered manner, one high and one low, or multiple first protrusions 21 can be arranged irregularly in high and low positions, which is only used as an example here.

[0059] like Figure 6 As shown, further, the plurality of first protrusions 21 are arranged at intervals so that there is a gap 202 between any two adjacent first protrusions 21. With such an arrangement, when the fluid in the tube body 10 absorbs heat from the external medium, as the temperature of the fluid gradually increases, a bubble core is formed at the wall of the tube cavity 101 and bubbles are gradually generated. The bubbles are conducive to the disturbance of the fluid to enhance the heat exchange performance of the fluid. As the bubbles grow, they will gradually separate from the fluid. The gap 202 is arranged so that when the bubbles separate from the fluid, the bubble core can be retained in the gap 202, which promotes the growth of subsequent bubbles, is conducive to the disturbance in the fluid, makes the nucleate boiling process more intense, and greatly increases the heat transfer.

[0060] like Figure 4 and Figure 6As shown, in a specific embodiment, in the drainage structure 20, along the radial direction of the tube body 10, the distance between the top of each first protrusion 21 and the surface of the base 22 connected to the wall of the tube cavity 101 is h, the tube diameter is R, h<R, and the distance between the root of the corresponding first protrusion 21 and the surface of the base 22 connected to the wall of the tube cavity 101 is t, 0.5mm≤t<h. Among them, the root of the first protrusion 21 is also the connection between the first protrusion 21 and the base 22. The smaller the t value, the deeper the root depth of the first protrusion 21, the larger the gap 202 between two adjacent first protrusions 21, and the more bubble cores can be retained, further promoting the effect of nucleate boiling and improving the heat exchange efficiency. At the same time, the root of the first protrusion 21 and the bottom of the base 22 connected to the cavity wall still retain a certain distance to ensure the structural stability of the base 22. In a specific embodiment, t=0.5mm, h / 4 or h / 2.

[0061] Specifically, Figure 5 and Figure 6 As shown, when the value of t is less than the thickness of the base 22, the root of the first protrusion 21 is embedded in the base 22; Figure 4 and Figure 7 As shown, when the value of t is equal to the thickness of the base 22 , the root of the first protrusion 21 is located on the surface of the base 22 ; in other embodiments, when the value of t is greater than the thickness of the base 22 , the root of the first protrusion 21 is located above the base 22 .

[0062] like Figure 6 As shown, in a further embodiment, at least a portion of the first protrusions 21 are provided with a through hole 211 that passes through the first protrusion 21. In this way, the provision of the through hole 211 facilitates reducing the flow resistance of the fluid, so that the fluid can flow smoothly through the through hole 211. At the same time, part of the fluid passes through the through hole 211, and part of the fluid flows around the first protrusion 21, which can also cause a certain disturbance effect on the fluid. When the fluid absorbs heat to produce a nucleate boiling effect, as more and more bubbles are generated, some bubbles cannot leave the escaping fluid and form a liquid film, which increases the heat transfer resistance of the fluid and is not conducive to the heat exchange of the fluid. Therefore, the provision of the through hole 211 can enhance the disturbance effect on the fluid, so that some bubbles can flow from the through hole 211 and escape the fluid, and break the liquid film in the fluid to promote heat transfer between the fluids.

[0063] like Figure 2 As shown, in the first protrusion 21 having the through hole 211 , the number of the through hole 211 is set to one.

[0064] like Figure 3 and Figure 6As shown, in other embodiments, in each first protrusion 21 having a through hole 211, the number of through holes 211 is n, and the n through holes 211 are arranged at intervals, 2≤n≤10. In this way, the multiple through holes 211 are conducive to promoting the smooth flow of the fluid and enhancing the disturbance effect of the fluid. The number of through holes 211 is limited to ensure the structural strength of the first protrusion 21 while facilitating the flow of the fluid. The multiple through holes 211 are evenly arranged at intervals, which reduces the adjustment of the hole spacing and facilitates processing. Exemplarily, n=2, 5 or 10, which should be set according to the size of the first protrusion 21 protruding radially along the tube body 10.

[0065] In more embodiments, the aperture sizes of at least two through holes 211 are different, so that the flow areas of the fluids are different, and the flow speeds and directions of the fluids are different, further enhancing the turbulence effect.

[0066] like Figure 7 As shown, in a further optional embodiment, the drainage structure 20 further includes a second protrusion 23, at least part of the first protrusions 21 are connected to the second protrusion 23, and the second protrusion 23 is arranged at an angle to the first protrusion 21; along the radial direction of the tube body 10, the second protrusion 23 extends from the first protrusion 21 toward the middle of the tube body 10. In this way, by adding the second protrusion 23, the disturbance effect on the fluid is further enhanced, and the heat exchange of the fluid is promoted.

[0067] In a specific embodiment, the cross section of the second protrusion 23 perpendicular to its thickness direction can be set to a triangle, a quadrilateral, etc., which is only used as an example and is not specifically limited.

[0068] like Figure 7 As shown, more specifically, the angle between the first protrusion 21 and the second protrusion 23 is α, 0°<α≤60°. This arrangement ensures that the second protrusion 23 is radially directed toward the middle of the tube body 10, which disturbs the fluid while reducing flow resistance, and facilitates the fluid to flow toward the middle of the tube body 10. At the same time, it is beneficial to reduce the axial size of the second protrusion 23 along the tube body 10, and avoid the second protrusion 23 from interfering with the adjacent first protrusion 21 as much as possible, which is beneficial to protect the structure adjacent to the first protrusion 21. Exemplarily, α=15°, 30° or 60°.

[0069] Next, the distribution of the drainage structure 20 in the tube body 10 is further described.

[0070] like Figures 1 to 3 As shown, in an optional embodiment, the number of the drainage structures 20 is multiple, and the multiple drainage structures 20 are arranged at intervals along the circumference of the tube body 10 and / or along the axial direction of the tube body 10. In this way, the arrangement of the multiple drainage structures 20 can produce drainage and turbulence effects on the fluid at different positions of the tube body 10 to promote heat exchange.

[0071] like Figures 1 to 3 As shown, in a further embodiment, the drainage structures 20 arranged at intervals along the circumference of the tube body 10 are a drainage group, and multiple drainage groups are arranged at intervals along the axial direction of the tube body 10. In this way, each drainage group can drain the fluid at the wall of the lumen 101 to the middle of the tube body 10 through each drainage structure 20, so as to enhance the mixing and disturbance effect of the fluid at the wall of the lumen 101 and the fluid at the middle of the tube body 10 where the drainage group is located. At the same time, multiple drainage groups are arranged at intervals along the axial direction of the tube body 10, so that the fluid can get a disturbance effect every time it passes through the drainage group during the axial flow of the fluid along the tube body 10, which intensifies the heat exchange of the fluid, promotes the generation of bubbles and the evaporation of the liquid. After the fluid passes through the drainage group, the disturbance effect lasts for a period of time and then gradually restores the stable flow. Then, it passes through another drainage group and is disturbed by the drainage group again, and this is repeated to enhance the heat exchange effect. In addition, the spacing of multiple drainage groups can reduce material consumption while achieving timely disturbance.

[0072] Specifically, in each drainage group, multiple drainage structures 20 can be arranged evenly spaced along the circumference of the tube body 10, which is conducive to using a unified mold for processing, avoiding material heterogeneity, and reducing production costs. At the same time, the spacing between any two adjacent drainage groups is related to the length of the tube body 10, and should be set according to actual conditions, and is not limited here.

[0073] In another embodiment, multiple drainage structures 20 are arranged in a spiral pattern along the axial direction of the tube body 10. In this way, on a cross section of the tube body 10, it is not necessary to set multiple drainage structures 20 along the circumference of the tube body 10, so that the flow area of ​​the fluid can be increased. As the fluid flows, along the axial direction of the tube body 10, any two adjacent drainage structures 20 have different drainage directions for the fluid, so that the fluid is more violently disturbed, which is conducive to further promoting the heat exchange effect.

[0074] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A heat exchange tube, characterized in that: include: A tube body (10) is provided with a tube cavity (101), one end of the tube body (10) along its own axial direction is defined as a first end (102), and the other end is defined as a second end (103), and the direction from the first end (102) toward the second end (103) is defined as the flow direction of the fluid; A drainage structure (20) is installed on the cavity wall of the tube cavity (101); along the axial direction of the tube body (10), the drainage structure (20) is provided with a drainage surface (201) at least on one side facing the first end (102), and the drainage surface (201) extends in the direction from the first end (102) toward the second end (103); along the radial direction of the tube body (10), the drainage start end of the drainage surface (201) is arranged closer to the cavity wall than the drainage end end of the drainage surface (201).

2. The heat exchange tube according to claim 1, characterized in that: The drainage structure (20) comprises a first protrusion (21), one end of the first protrusion (21) is connected to the wall of the lumen (101), and the other end of the first protrusion (21) extends radially along the tube body (10) toward the middle of the tube body (10); Along the axial direction of the tube body (10), at least one surface of the first protrusion (21) facing the first end (102) is arranged as the drainage surface (201).

3. The heat exchange tube according to claim 1, characterized in that: The drainage structure (20) comprises a base (22) and a first protrusion (21) connected to the base (22), the base (22) being connected to the wall of the tube cavity (101), and the first protrusion (21) extending radially along the tube body (10) toward the middle of the tube body (10); Along the axial direction of the tube body (10), at least one surface of the first protrusion (21) facing the first end (102) is arranged as the drainage surface (201).

4. The heat exchange tube according to any one of claims 1 to 3, characterized in that: The drainage surface (201) is configured as an arc-shaped curved surface, and the curvature radius of the arc-shaped curved surface is r, where r≥5.

5. The heat exchange tube according to claim 2 or 3, characterized in that: The first protrusion (21) is arranged to gradually contract along the radial direction of the tube body (10) toward the middle of the tube body (10).

6. The heat exchange tube according to claim 3, characterized in that: In the drainage structure (20), a plurality of first protrusions (21) are provided, and the plurality of first protrusions (21) are arranged at intervals along the axial direction of the tube body (10), and each of the first protrusions (21) is correspondingly provided with at least one drainage surface (201).

7. The heat exchange tube according to claim 6, characterized in that: In the drainage structure (20), a plurality of the first protrusions (21) are arranged in a staggered manner along the axial direction of the tube body (10).

8. The heat exchange tube according to claim 6, characterized in that: In the drainage structure (20), along the radial direction of the tube body (10), the distance between the top of each first protrusion (21) and the surface of the base (22) connected to the wall of the tube cavity (101) is h, the tube diameter is R, h<R, and the distance between the root of the corresponding first protrusion (21) and the surface of the base (22) connected to the wall of the tube cavity (101) is t, 0.5mm≤t<h.

9. The heat exchange tube according to claim 6, characterized in that: At least some of the first protrusions (21) are provided with through holes (211) penetrating the first protrusions (21).

10. The heat exchange tube according to claim 9, characterized in that: In each of the first protrusions (21) provided with the through holes (211), the number of the through holes (211) is n, and the n through holes (211) are arranged at intervals, 2≤n≤10; wherein at least two of the through holes (211) have different aperture sizes.

11. The heat exchange tube according to claim 6, characterized in that: The drainage structure (20) further includes a second protrusion (23); At least part of the first protrusions (21) are connected to the second protrusions (23), and the second protrusions (23) are arranged at an angle to the first protrusions (21); along the radial direction of the tube body (10), the second protrusions (23) extend from the first protrusions (21) toward the middle of the tube body (10).

12. The heat exchange tube according to claim 11, characterized in that: The included angle between the first protrusion (21) and the second protrusion (23) is α, 0°<α≤60°.

13. The heat exchange tube according to any one of claims 2 or 3, characterized in that: The drainage structures (20) are provided in a plurality, and the plurality of drainage structures (20) are arranged at intervals along the circumference of the tube body (10) and / or along the axial direction of the tube body (10).

14. The heat exchange tube according to claim 13, characterized in that: Along the axial direction of the tube body (10), the plurality of drainage structures (20) are arranged at intervals in a spiral manner; or, the drainage structures (20) arranged at intervals along the circumference of the tube body (10) form a drainage group, and the plurality of drainage groups are arranged at intervals along the axial direction of the tube body (10).

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