Heat exchanger and heat exchange tube thereof
By setting an internal fin structure inside the heat exchange tube, welding the fins to the tube body and designing staggered flow channels, the problems of heat transfer efficiency and processing difficulty are solved, achieving efficient heat exchange and simplified processing.
Patent Information
- Application Number
- CN202520471510.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-18
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-18
AI Technical Summary
Existing heat exchange tubes have shortcomings in heat transfer efficiency and manufacturing difficulty, especially the limited number and area of internal fins, and the complex manufacturing process.
The tube adopts an internal fin structure design, with the fins folded in an integral wave shape along the circumference of the support axis. The fins are welded to the inner wall of the tube body through interference fit and resistance welding. The flow channels are staggered, which reduces the processing difficulty and improves the heat transfer efficiency.
Reliable welding of the inner fin structure to the tube body was achieved, reducing processing difficulty and improving heat transfer efficiency and heat exchange uniformity.
Smart Images
Figure CN223882809U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of heat exchange equipment, and in particular to a heat exchanger and a heat exchange pipe thereof. BACKGROUND
[0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. Heat exchangers play an important role in chemical industry, petroleum industry, power industry, food industry and many other industrial productions. In chemical production, heat exchangers can be used as heaters, coolers, condensers, evaporators and reboilers, and are widely used.
[0003] As the core device for fluid heat exchange in the fields of industry, energy and HVAC (heating, ventilation and air conditioning), the performance of a heat exchanger directly affects the energy efficiency and economy of a system. As the core component of a heat exchanger, a heat exchange pipe continuously improves heat transfer efficiency through surface morphology design, material optimization and structural innovation. Traditional heat exchange pipes mainly include smooth pipes, threaded pipes and external finned pipes. Smooth pipes are widely used due to their simple manufacturing process and low cost, but their smooth surface leads to a thick fluid boundary layer and low heat transfer coefficient. Threaded pipes can enhance heat transfer by disturbing fluid flow through the spiral structure of the inner wall, but they are still limited by the single inner wall morphology and large flow resistance. External finned pipes expand the heat dissipation area through metal fins outside the pipe, but they are difficult to meet the compactness requirement due to their large volume, easy dust accumulation or condensation.
[0004] In recent years, the "in-pipe fin" technology for heat transfer enhancement inside the pipe has gradually attracted attention. By setting a flow guide or flow disturbance structure (such as an inner fin, a reverse tooth, a corrugated pipe, etc.) on the inner wall of the heat exchange pipe, the heat transfer efficiency between the main flow and the pipe wall can be significantly improved, especially in terms of strengthening turbulent flow and reducing thermal resistance.
[0005] Among them, the integrated inner fin design has great advantages in heat conduction between the heat exchange pipe and the heat exchange pipe. Because of the integrated design, the conduction between the two is fast, but relatively, the generation and processing of such heat exchange pipes are more difficult, and the number and area of the inner fin in the channel have greater limitations. CONTENT OF THE UTILITY MODEL
[0006] In order to improve the number and area of the inner fin, the present application provides a heat exchanger and a heat exchange pipe thereof.
[0007] On the one hand, the heat exchange pipe of the heat exchanger provided by the present application adopts the following technical solution:
[0008] A heat exchange tube of a heat exchanger, comprising a tube body, an inner fin structure is arranged in the tube body, the inner fin structure comprises a support shaft and a fin which is integrally folded in a wave shape around the support shaft, the fin forms a folded inner side and a folded outer side along the support shaft in the folding process, the folded inner side is welded with the outer wall of the support shaft, and the folded outer side is welded with the inner wall of the tube body, and the fin in the wave shape divides the tube body into independent flow channels.
[0009] In one of the embodiments, the folded outer side of the fin and the inner wall of the tube body are welded by interference insertion and then resistance butt welding.
[0010] In one of the embodiments, one end of the tube body is provided with a necking.
[0011] In one of the embodiments, a plurality of inner fin structures are arranged in the tube body in the axial direction, and the flow channels between the two adjacent inner fin structures are arranged in a staggered manner.
[0012] In one of the embodiments, the wave of the fin is arranged in a clockwise or counterclockwise bending manner in the cross section.
[0013] In one of the embodiments, the bending directions of the waves of the two adjacent fins are opposite.
[0014] In one of the embodiments, the length of the support shaft in the axial direction of the same inner fin structure is greater than the length of the fin.
[0015] In another aspect, the application provides a heat exchanger, which adopts the following technical scheme:
[0016] A heat exchanger, comprising a shell, an inlet and an outlet arranged on the side wall of the shell, and a plurality of heat exchange tubes fixed to the shell in the axial direction, the inlet and the outlet are communicated with the inner cavity of the shell, and the heat exchange tubes penetrate through the shell and are connected to both ends of the shell.
[0017] In one of the embodiments, both ends of the heat exchange tube protrude from the end of the shell.
[0018] In summary, the application has the following beneficial effects:
[0019] 1. The inner fin structure and the tube body are installed in a split manner, and resistance butt welding is used to realize the welding between the inner fin structure and the tube body, thereby reducing the overall processing difficulty.
[0020] 2. By designing the multi-section inner fin structure, the resistance can be reduced during installation of the inner fin structure, and the processing difficulty can be further reduced.
[0021] 3. The multi-section inner fin is designed in a staggered flow channel, so that the water flow can be mixed to improve the uniformity of heat exchange.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a structural schematic diagram of the embodiment;
[0023] Figure 2 is a structural schematic diagram of the heat exchange pipe in the embodiment;
[0024] Figure 3 is a structural schematic diagram of the inner fin structure in the embodiment;
[0025] Figure 4 is a front view of the heat exchange pipe in the embodiment.
[0026] In the figure, 100, shell; 200, heat exchange pipe; 210, pipe body; 220, inner fin structure; 300, connection. DETAILED DESCRIPTION
[0027] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the utility model are described in detail as follows in combination with the drawings and preferred embodiments.
[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0029] A heat exchanger, as shown in Figure 1 , comprises a shell 100 and a heat exchange pipe 200, and the shell 100 is cylindrical and internally hollow. Two connections 300 pipes are arranged on the side wall of the shell 100, and the openings of the two connections 300 pipes are respectively an inlet and an outlet. The inlet and the outlet are in communication with the inner cavity of the shell 100, and a connection 300 flange is arranged at the end of the two connections 300 pipes and at both ends of the shell 100.
[0030] The heat exchange pipe 200 is provided in plurality, and the heat exchange pipe 200 penetrates the shell 100 in the axial direction and is connected 300 to both ends of the shell 100. In addition, the end of the heat exchange pipe 200 is connected 300 to the shell 100 by welding, and in order to facilitate welding, the two ends of the heat exchange pipe 200 are arranged to protrude from the end of the shell 100.
[0031] As shown in Figure 2 , the heat exchange pipe 200 comprises a pipe body 210, and the pipe body 210 is internally provided with an inner fin structure 220, and the inner fin structure 220 comprises a support shaft and a fin which is integrally folded in a wave shape in the circumferential direction around the support shaft.
[0032] With reference to the accompanying drawings Figure 3 , the fins form a folded inner side and a folded outer side in the folding process along the support shaft, the folded inner side and the folded outer side are the troughs and crests of the waves, the folded inner side is welded to the outer wall of the support shaft, and the folded outer side is welded to the inner wall of the pipe body 210, and the wave-shaped fins divide the pipe body 210 into independent multiple flow channels.
[0033] In order to facilitate processing, the fins in the present application can be welded to the support shaft in the folding process, and the welding between the folded outer side of the fins and the inner wall of the pipe body 210 is first achieved by inserting the inner fin structure 220 into the pipe body 210, and at this time, the insertion requires an interference fit between the inner fin structure 220 and the pipe body 210.
[0034] Preferably, the fins are made of copper material with good ductility and thermal conductivity, and the good ductility can reduce the precision requirement for the radial size of the folded fins, and after the insertion is completed, the welding is achieved by resistance butt welding.
[0035] At the same time, due to the ductility, the inner fin structure 220 is bent before installation, and preferably, the cross section of the wave of the fin is bent in the same direction clockwise or counterclockwise.
[0036] In addition, the pipe body 210 is provided with a plurality of inner fin structures 220 in the axial direction, as shown in Figure 4 , the flow channels between the two connected inner fin structures 220 are staggered. Specifically, the opposite fins can be directly installed in the opposite direction, so that the bending directions of the waves of the two fins are opposite.
[0037] In order to avoid installation, as shown in Figure 2 , the inner fin structure 220 extends from the other end, and the pipe body 210 is provided with a neck at one end, and the neck is designed in a gradually decreasing structure.
[0038] In addition, it should be noted that in other embodiments, the length of the same inner fin structure 220 along the axial direction of the support shaft can be greater than the length of the fin, so that there is an optical axis segment between the two adjacent inner fin structures 220, so that the medium passes through a segment of fins, then passes through the optical axis segment to form a mixture, and then enters the next segment of fins.
[0039] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make minor changes or modifications to the disclosed technical content, or make equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change or modification of the above embodiments, which does not depart from the technical solution of the present application, is still within the scope of the technical solution of the present application.
Claims
1. A heat exchange tube of a heat exchanger comprising a tube body (210), characterized by: The pipe body (210) is internally provided with an inner fin structure (220), which comprises a support shaft and a fin arranged in an integrated wave shape around the support shaft in a circumferential direction, the fin forms a folded inner side and a folded outer side along the support shaft in the folding process, the folded inner side is welded with the outer wall of the support shaft, and the folded outer side is welded with the inner wall of the pipe body (210), and the wave-shaped fin separates the pipe body (210) into independent multiple flow channels. The pipe body (210) is internally provided with multiple inner fin structures (220) arranged in an axial direction, and the flow channels between the two adjacent inner fin structures (220) are arranged in a staggered manner.
2. A heat exchanging tube of a heat exchanger according to claim 1, characterized in that: The folded outer side of the fin and the inner wall of the pipe body (210) are welded by interference insertion and then resistance butt welding.
3. The heat exchanging tube of a heat exchanger according to claim 1, characterized in that: One end of the pipe body (210) is provided with a necking.
4. The heat exchanging tube of a heat exchanger according to claim 1, characterized in that: The cross section of the wave of the fin is arranged in a clockwise or counterclockwise bending manner.
5. A heat exchanging tube of a heat exchanger according to claim 4, characterized in that: The bending directions of the waves of the two adjacent fins are opposite.
6. The heat exchanging tube of a heat exchanger according to claim 1, characterized in that: The length of the support shaft in the axial direction of the same inner fin structure (220) is greater than the length of the fin.
7. A heat exchanger, characterized by: The heat exchange pipe (200) comprises an outer shell (100), an inlet and an outlet arranged on the side wall of the outer shell (100), and multiple heat exchange pipes (200) fixed to the outer shell (100) in an axial direction, the inlet and the outlet are communicated with the inner cavity of the outer shell (100), and the heat exchange pipe penetrates through the outer shell (100) and is connected with the outer shell (100) at both ends (300).
8. A heat exchanger according to claim 7, characterised in that: Both ends of the heat exchange pipe protrude from the end of the outer shell (100).