Heat exchange tube with fins
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU SANCHUAN HEAT EXCHANGER CO LTD
- Filing Date
- 2025-07-03
- Publication Date
- 2026-07-24
AI Technical Summary
While existing heat exchange tubes improve heat transfer efficiency, they also present problems such as high processing difficulty and reduced effective heat exchange area.
Design a heat exchange tube with internal fins. The fin structure is evenly distributed along the circumferential inner wall of the heat exchange tube, including long fins, short fins and medium fins. By designing different heights and setting the core space, the internal space of the tube is fully utilized to increase the heat exchange area.
It significantly improves heat exchange efficiency, increases the secondary heat exchange area inside the tube to several times that of the primary heat exchange area inside the tube, and has a simple structure and low wear.
Smart Images
Figure CN224552185U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat exchange tube technology, specifically to a heat exchange tube with internal fins. Background Technology
[0002] Currently, most heat exchange tubes in existing technologies are bare tubes, but in order to improve heat exchange efficiency, designers often install internal fins inside the bare tubes.
[0003] Patent document CN103175429B discloses a multi-directional corrugated inner finned tube, comprising an outer tube with multiple multi-directional corrugated inner fins evenly distributed on its inner circumferential surface. Each multi-directional corrugated inner fin includes a root, two straight walls, and two bends. Multi-directional corrugations are distributed on the two straight walls, with the corrugations on the same straight wall exhibiting the same pattern. The bends are brazed to the inner surface of the outer tube. The straight walls extend radially along the outer tube. The outer tube and the multi-directional corrugated inner fins form multiple parallel flow channels. This invention provides a multi-directional corrugated inner finned tube with diverse structural forms and easy molding and processing. Compared to plain tubes, it significantly increases the effective heat transfer area, effectively guiding the flow pattern of the fluid medium within the tube, enhancing secondary flow, intensifying lateral turbulence, increasing turbulence intensity, and strongly interfering with the fluid medium boundary layer, thus achieving highly efficient heat transfer. Simultaneously, the longitudinal flow resistance within the tube is controllable, and compared to ordinary inner finned tubes, the resistance is significantly reduced under the same heat load.
[0004] The aforementioned patent document discloses a technical solution to the uncontrollable longitudinal flow resistance of fluid media in pipes, but it still has limitations in practical implementation, as follows:
[0005] First, the aforementioned patent document describes the placement of a core tube in the central region of the tube body; this technology can be referenced. Figure 4 Although this design can guide the central fluid to multiple near-wall channels through the core tube, this will significantly increase the difficulty of processing, for example, it is necessary to ensure the weld seal between the core tube and the fins.
[0006] Secondly, in the aforementioned patent literature, a core tube is set in the central region of the tube body. Although this design can guide the central fluid to multiple near-tube wall channels through the core tube, from the perspective of the entire heat exchange tube, the core tube occupies the central region of the tube body, resulting in a reduction in the usable heat exchange area.
[0007] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content
[0008] This invention provides a heat exchange tube with internal fins, which aims to solve the technical problems mentioned in the background art.
[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a heat exchange tube with internal fins, wherein the inner wall of the heat exchange tube is provided with a fin structure, and the fin structure is evenly distributed along the circumferential inner wall of the heat exchange tube; the fin structure includes a plurality of fin bodies distributed on the circumferential inner wall of the heat exchange tube, the fin bodies being arranged at intervals to divide the internal space of the heat exchange tube into a plurality of medium flow channels; each fin body has a root fixedly connected to the inner wall of the heat exchange tube and a tip extending toward the center of the heat exchange tube; in any cross section perpendicular to the axis of the heat exchange tube... On the surface, the fin body includes multiple long fins and short fins in the same plane; the long fins are spaced apart on the circumferential inner wall of the heat exchange tube, and the short fins are spaced apart between adjacent long fins; the tips of all the long fins converge at the center of the heat exchange tube, and the tips of each long fin are in contact with each other or not in contact, defining a core space at the center of the heat exchange tube; the length of the short fins on the cross-section of the heat exchange tube is less than the length of the long fins; and the diameter of the core space is less than or equal to the distance between the roots of adjacent fins.
[0010] The relevant content in the above plan is explained as follows:
[0011] In the above scheme, the fin body can be straight, porous, serrated, etc.
[0012] Unlike existing technologies, this application can make full use of the internal space of the pipe by designing different heights for the long and short fins and setting the core space, thereby increasing the heat exchange area and ensuring the heat exchange efficiency of the heat exchange tube.
[0013] In a further technical solution, on any cross-section perpendicular to the axis of the heat exchange tube, the fin body further includes a plurality of middle fins, the length of which on the cross-section of the heat exchange tube is less than the length of the long fins but greater than the length of the short fins; the middle fins are spaced apart between adjacent long fins, and the middle fins are also spaced apart between adjacent short fins, the adjacent short fins being located between adjacent long fins.
[0014] In the above scheme, the types of wings in the finned body are not limited to three, but can be more, such as long wings, secondary long wings, medium wings, and short wings.
[0015] In the above scheme, the presence of multiple medium flow channels is mainly to divide the space inside the heat exchange tube into multiple small spaces, so that the heat exchange tube has more heat exchange area. In this heat exchange tube with internal fins, the increased secondary heat exchange area inside the tube (fin body + tube wall) is several times that of the primary heat exchange area inside the tube (tube wall only), such as 12 times, which can make the heat exchange efficiency higher.
[0016] A further technical solution is that the fin body has multiple segments that are sequentially spliced along the axial direction of the heat exchange tube. Each segment of the fin body is made by rolling or stamping on the same piece of sheet metal, and after being bent into a tubular shape, it is embedded in the heat exchange tube and welded and fixed between the root of the fin body and the inner wall of the heat exchange tube.
[0017] The above design allows the long wing, middle wing, and short wing to be fixed in place, resulting in minimal wear.
[0018] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.
[0019] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.
[0020] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.
[0021] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.
[0022] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.
[0023] The working principle and advantages of this utility model are as follows:
[0024] Unlike existing technologies, this application can make full use of the internal space of the pipe by designing different heights for the long and short fins and setting the core space, thereby increasing the heat exchange area and ensuring the heat exchange efficiency of the heat exchange tube. Attached Figure Description
[0025] Appendix Figure 1 This is a schematic diagram of the structure of the second embodiment provided by this utility model;
[0026] Appendix Figure 2 A schematic diagram of the structure of the first embodiment of this utility model;
[0027] Appendix Figure 3 This is a schematic diagram of the structure of the finned body in this utility model after it has been bent into a tubular shape.
[0028] Appendix Figure 4 This is a schematic diagram of fluid flowing inside a heat exchange tube in the prior art (the heat exchange tube is equipped with a core tube).
[0029] Appendix Figure 5 A schematic diagram of the structure of the third embodiment provided by this utility model;
[0030] Appendix Figure 6 This is a schematic diagram illustrating the state of the finned body in this embodiment of the present invention when it is formed by rolling or stamping a sheet material and is not bent into a tubular shape.
[0031] In the above attached diagrams: 1. Heat exchange tube; 2. Finned body; 3. Medium flow channel; 4. Root; 5. Tip; 6. Core space; 7. Long fin; 8. Short fin; 9. Middle fin;
[0032] R1, diameter of the core space; H1, distance between the roots of adjacent fins. Detailed Implementation
[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0034] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.
[0035] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.
[0036] See appendix Figures 1-6As shown, a heat exchange tube with internal fins is provided on the inner wall of the heat exchange tube 1. The fin structure is evenly distributed along the circumference of the inner wall of the heat exchange tube 1. The fin structure includes a plurality of fin bodies 2 distributed on the circumference of the inner wall of the heat exchange tube 1. The fin bodies 2 are spaced apart to divide the internal space of the heat exchange tube 1 into a plurality of medium flow channels 3. Each fin body 2 has a root 4 fixedly connected to the inner wall of the heat exchange tube 1 and a tip 5 extending toward the center of the heat exchange tube 1. In any cross-section perpendicular to the axis of the heat exchange tube 1, the fin body 2 includes a plurality of... Long fins 7 and short fins 8 are located in the same plane; the long fins 7 are distributed at intervals on the circumferential inner wall of the heat exchange tube 1, and the short fins are spaced between adjacent long fins 7; the tips 5 of all the long fins 7 converge at the center of the heat exchange tube 1, and the tips 5 of each long fin 7 are in contact with each other or not in contact, defining a tube core space 6 at the center of the heat exchange tube 1; the length of the short fins 8 on the cross-section of the heat exchange tube 1 is less than the length of the long fins 7; and the diameter R1 of the tube core space 6 is less than or equal to the distance H1 between the roots 4 of adjacent fin bodies 2.
[0037] In this embodiment, the fin body 2 can be straight, porous, serrated, etc.
[0038] Unlike existing technologies, this application can make full use of the internal space of the pipe by designing the different heights of the long fin 7 and the short fin 8 and setting the core space 6, thereby increasing the heat exchange area and ensuring the heat exchange efficiency of the heat exchange tube 1.
[0039] Preferably, on any cross-section perpendicular to the axis of the heat exchange tube 1, the fin body 2 further includes a plurality of middle fin portions 9, the length of which on the cross-section of the heat exchange tube 1 is less than the length of the long fin portion 7, but greater than the length of the short fin portion 8; the middle fin portion 9 is spaced between adjacent long fin portions 7, and the middle fin portion 9 is also spaced between adjacent short fin portions 8, the adjacent short fin portions 8 being located between adjacent long fin portions 7.
[0040] In this embodiment, the types of wing portions 9 in the fin body 2 are not limited to three, but can be more, such as long wing portions 7, secondary long wing portions, middle wing portions 9, and short wing portions 8, etc.
[0041] In this embodiment, the presence of multiple medium flow channels 3 is mainly to divide the space inside the heat exchange tube 1 into multiple small spaces, thereby increasing the heat exchange area of the heat exchange tube 1. Figure 5 In the internal finned tube structure shown, the increased secondary heat exchange area inside the tube (finned body 2 + tube wall) is several times the primary heat exchange area inside the tube (tube wall only), such as one or two times, which can make the heat exchange efficiency higher.
[0042] The following embodiments are provided for the aforementioned long wing portion 7, short wing portion 8, and mid wing portion 9:
[0043] First Embodiment
[0044] See Figure 2 On any cross-section perpendicular to the axis of the heat exchange tube 1, the fin body 2 includes a plurality of long fins 7 and middle fins 9 in the same plane; all the long fins 7 are spaced apart along the circumferential inner wall of the heat exchange tube 1, and the root 4 of each long fin 7 is connected to the tube wall of the heat exchange tube 1; the root 4 of each middle fin 9 is also connected to the inner wall of the heat exchange tube 1, and the connection point of the root 4 of each middle fin 9 is located at the interval between the roots 4 of adjacent long fins 7; the length of the middle fin 9 is less than the length of the long fins 7; the tips 5 of the plurality of long fins 7 extend toward the axis of the heat exchange tube 1 and together form the tube core space 6 near the axis of the heat exchange tube 1; the diameter of the tube core space 6 is less than or equal to the interval between the roots 4 of adjacent long fins 7 and middle fins 9.
[0045] Reference Figure 2 As shown, in this case, after the medium enters the heat exchange tube 1, it will come into contact with the surfaces of the long fin 7 and the middle fin 9, so that the heat of the medium is transferred to the heat exchange medium outside the heat exchange tube 1 through the surfaces of the long fin 7 and the middle fin 9.
[0046] Second Embodiment
[0047] See Figure 1 On any cross-section perpendicular to the axis of the heat exchange tube 1, the fin body 2 includes a plurality of long fins 7 and short fins 8 in the same plane; all the long fins 7 are spaced apart along the circumferential inner wall of the heat exchange tube 1, and the root 4 of each long fin 7 is connected to the tube wall of the heat exchange tube 1; the root 4 of each short fin 8 is also connected to the inner wall of the heat exchange tube 1, and the connection point of the root 4 of each short fin 8 is located at the interval between the roots 4 of adjacent long fins 7; the length of the short fin 8 is less than or equal to half the length of the long fin 7; the tips 5 of the plurality of long fins 7 extend toward the axis of the heat exchange tube 1 and together form the tube core space 6 near the axis of the heat exchange tube 1; the diameter of the tube core space 6 is less than or equal to the interval between the roots 4 of adjacent long fins 7 and short fins 8.
[0048] Reference Figure 1 As shown, in this case, after the medium enters the heat exchange tube 1, it will come into contact with the surfaces of the long fin 7 and the short fin 8, so that the heat of the medium is transferred to the heat exchange medium outside the heat exchange tube 1 through the surfaces of the long fin 7 and the short fin 8.
[0049] It should be noted that since the length of the middle fin 9 is greater than that of the short fin 8, the heat exchange area is correspondingly larger. Therefore, under the same pipe diameter, the heat exchange efficiency of Example 1 is greater than that of Example 2.
[0050] Third Embodiment
[0051] See Figure 5 On any cross-section perpendicular to the axis of the heat exchange tube 1, the fin body 2 includes multiple long fins 7, medium fins 9, and short fins 8 in the same plane with decreasing lengths. All the long fins 7 are spaced apart along the circumferential inner wall of the heat exchange tube 1, and the root 4 of each long fin 7 is connected to the tube wall of the heat exchange tube 1. The root 4 of each short fin 8 is also connected to the inner wall of the heat exchange tube 1, and the connection point of the root 4 of each short fin 8 is located at the interval between the roots 4 of adjacent long fins 7 (e.g., ...). Figure 5 Two short wings 8 are provided at the interval between the roots 4 of adjacent long wings 7, and a middle wing 9 is provided between the two short wings 8. The root 4 of each middle wing 9 is also connected to the inner wall of the heat exchange tube 1, and the connection point of the root 4 of each middle wing 9 is located at the interval between the roots 4 of adjacent long wings 7 and short wings 8. The interval between the root 4 of the middle wing 9 and the root 4 of the long wing 7 is equal to the interval between the root 4 of the long wing 7 and the root 4 of the short wing 8. The tips 5 of the multiple long wings 7 extend toward the axis of the heat exchange tube 1 and together form the tube core space 6 near the axis of the heat exchange tube 1.
[0052] Heat exchanger tube 1 structure reference Figure 5 As shown, in this case, after the medium enters the heat exchange tube 1, it is distributed to each flow channel and will contact the surfaces of the long fin 7, the middle fin 9 and the short fin 8, as well as the inner surface of the heat exchange tube 1, so that the heat of the medium is transferred to the heat exchange medium outside the heat exchange tube 1 through the surfaces of the long fin 7, the middle fin 9 and the short fin 8 and the heat exchange tube 1.
[0053] It should be noted that, compared to the first and second embodiments, the third embodiment has more separated flow channels and a larger heat exchange area. Therefore, the third embodiment is more suitable for heat exchange tubes 1 with larger diameters, and it also allows for full utilization of the internal space of the heat exchange tube 1. In specific implementations, the height of the fins 2 is not limited to three types: long, medium, and short; it can be multiple. Depending on the tube diameter, medium characteristics, and operating conditions, it can achieve both sufficiently high heat exchange efficiency and a simplified structure.
[0054] Preferably, the fin body 2 has multiple segments that are sequentially spliced along the axial direction of the heat exchange tube 1. Each segment of the fin body 2 is made by rolling or stamping on the same piece of plate, and after being rolled into a tube shape, it is embedded in the heat exchange tube 1 and welded and fixed between the root 4 of the fin body 2 and the inner wall of the heat exchange tube 1.
[0055] The above design allows the long wing 7, the middle wing 9, and the short wing 8 to be fixed, resulting in minimal wear.
[0056] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A heat exchange tube with internal fins, wherein the inner wall of the heat exchange tube (1) is provided with a fin structure, the fin structure being evenly distributed along the circumferential inner wall of the heat exchange tube (1); characterized in that: The fin structure includes a plurality of fin bodies (2) distributed on the circumferential inner wall of the heat exchange tube (1), with each fin body (2) arranged at intervals to divide the internal space of the heat exchange tube (1) into a plurality of medium flow channels (3); each fin body (2) has a root (4) fixedly connected to the inner wall of the heat exchange tube (1) and a tip (5) extending toward the center of the heat exchange tube (1). In any cross section perpendicular to the axis of the heat exchange tube (1), the finned body (2) includes a plurality of long fins (7) and short fins (8) in the same plane. The long fins (7) are spaced apart on the circumferential inner wall of the heat exchange tube (1), and the short fins (8) are spaced apart between adjacent long fins (7); the tips (5) of all the long fins (7) converge at the center of the heat exchange tube (1), and the tips (5) of each long fin (7) are in contact with each other or not in contact, defining a tube core space (6) at the center of the heat exchange tube (1). The length of the short fin (8) on the cross-section of the heat exchange tube (1) is less than the length of the long fin (7); and the diameter of the tube core space (6) is less than or equal to the distance between the roots (4) of the adjacent fin bodies (2).
2. The heat exchange tube with internal fins according to claim 1, characterized in that: On any cross section perpendicular to the axis of the heat exchange tube (1), the fin body (2) further includes a plurality of middle fins (9), the length of which on the cross section of the heat exchange tube (1) is less than the length of the long fin (7) but greater than the length of the short fin (8); The middle wing portion (9) is spaced between adjacent long wing portions (7), and the middle wing portion (9) is also spaced between adjacent short wing portions (8), which are located between adjacent long wing portions (7).
3. The heat exchange tube with internal fins according to claim 1, characterized in that: The fin body (2) has multiple segments and is spliced sequentially along the axis of the heat exchange tube (1). Each segment of the fin body (2) is made by rolling or stamping on the same plate, and after being rolled into a tube shape, it is embedded in the heat exchange tube (1) and welded and fixed between the root (4) of the fin body (2) and the inner wall of the heat exchange tube (1).