Internal insertion piece of heat exchange tube, heat exchange tube and heat exchanger

Abstract

The utility model relates to an inner inserting piece of a heat exchange tube, the heat exchange tube and a heat exchanger, the inner inserting piece of the heat exchange tube is used for being inserted into a tube body of the heat exchange tube, and the inner inserting piece comprises a center shaft, a first flow guide structure and a second flow guide structure, the first flow guide structure comprises a spiral flow guide plate arranged in the length direction of the center shaft, the second flow guide structure comprises a second flow guide plate arranged in the length direction of the center shaft in an extending mode, the inner inserting piece of the heat exchange pipe can improve the turbulent flow effect of fluid by changing the flowing mode of the fluid, laminar flow boundary layers formed by the fluid on the pipe wall can be reduced, and the heat exchange efficiency is improved. And the phenomenon of scaling in the pipe can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of heat exchange tubes, and in particular to an inner plug-in unit of a heat exchange tube, a heat exchange tube and a heat exchanger. Background Art

[0002] Shell and tube heat exchangers are currently the most widely used type of heat exchangers. However, after long-term operation, scaling will occur inside the shell and tube heat exchanger, causing the fluid channel in the heat exchanger tube to narrow, seriously affecting the heat exchange efficiency. At the same time, scaling will also cause under-scale corrosion in the tube, and even block the pipeline in severe cases, which is very detrimental to the safe and stable operation of the shell and tube heat exchanger. In addition, the flow form of the fluid in the existing shell and tube heat exchanger is single, and it is easy to form a laminar boundary layer on the tube wall, which will also reduce the heat exchange efficiency of the fluid inside and outside the heat exchange tube. Utility Model Content

[0003] The purpose of the present disclosure is to provide an inner plug of a heat exchange tube, a heat exchange tube and a heat exchanger, which can increase the turbulence effect of the fluid by changing the flow form of the fluid, reduce the formation of a laminar boundary layer of the fluid on the tube wall, and reduce the scaling phenomenon in the tube, so as to at least partially solve the above-mentioned technical problems.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides an inner plug of a heat exchange tube, which is used to be inserted into the tube body of the heat exchange tube, and the inner plug includes a central axis and a first flow guide structure and a second flow guide structure alternately arranged along the length direction of the central axis, the first flow guide structure includes a spiral flow guide plate arranged along the length direction of the central axis, and the second flow guide structure includes a second flow guide plate extending along the length direction of the central axis.

[0005] Optionally, the second guide plate includes: a guide portion connected to the central axis and extending in a direction away from the central axis; a support guard plate connected to one end of the guide portion away from the central axis, and the outer end surface of the support guard plate facing away from the guide portion is constructed as an arc surface.

[0006] Optionally, the number of the guide parts and the number of the supporting guard plates are the same and are at least two.

[0007] Optionally, the guide portion is provided with a plurality of channel holes arranged at intervals along the length direction of the central axis.

[0008] Optionally, the spiral guide plate is provided with a plurality of first guide holes, and the first guide holes are configured as circular holes and / or fan-shaped holes.

[0009] Optionally, the inner arc edge and / or the outer arc edge of the fan-shaped hole is parallel to the outer edge of the spiral guide plate.

[0010] Optionally, a maximum radial length of the second guide plate in the radial direction of the central axis is greater than a maximum radial length of the spiral guide plate in the radial direction of the central axis.

[0011] A second aspect of the present disclosure provides a heat exchange tube, comprising a tube body and an inner plug-in as described in any of the above solutions.

[0012] Optionally, the heat exchange tube further includes a support member, and the inner plug-in is connected to the tube body via the support member.

[0013] A third aspect of the present disclosure provides a heat exchanger comprising the heat exchange tube described in any of the above schemes.

[0014] Through the above technical solution, that is, the inner plug provided by the present disclosure, after the inner plug is inserted into the tube body of the heat exchange tube, the fluid in the tube body will flow along the length direction of the tube body. During the flow process, the alternately arranged first flow guide structure and the second flow guide structure will continuously change the flow form of the fluid, that is, when the fluid passes through the first flow guide structure, the fluid flows forward in a spiral along the extension direction of the spiral guide plate, and when the fluid passes through the second flow guide structure, the fluid flows straight along the extension direction of the second guide plate. Under the alternating cycle of the above two flow modes, the fluid in the tube body will cyclically change between the two states of axial flow and circumferential flow, which can repeatedly increase the turbulent effect of the fluid, and can also reduce or even avoid the formation of a laminar boundary layer of the fluid on the tube wall, thereby preventing scaling in the tube.

[0015] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0017] Figure 1 is a cross-sectional schematic diagram of a heat exchange tube and a heat exchange tube inner insert provided in an exemplary embodiment of the present disclosure;

[0018] Figure 2 is a schematic axial cross-sectional view of a second guide plate and a tube body provided in an exemplary embodiment of the present disclosure;

[0019] Figure 3 is a schematic diagram of a first flow guide hole provided in an exemplary embodiment of the present disclosure as a circular hole;

[0020] Figure 4 is a schematic diagram of a first air guide hole provided in an exemplary embodiment of the present disclosure as a fan-shaped hole;

[0021] Figure 5 is a cross-sectional view of a heat exchange tube and a support member provided in an exemplary embodiment of the present disclosure;

[0022] Figure 6 is an axial cross-sectional view of a heat exchange tube and a support member provided in an exemplary embodiment of the present disclosure.

[0023] Description of Reference Numerals

[0024] 1-first flow guide structure; 110-spiral flow guide plate; 2-second flow guide structure; 210-second flow guide plate; 211-flow guide portion; 212-support guard plate; 3-tube body; 4-central axis; 5-support member; A-first flow guide hole; B-channel hole. DETAILED DESCRIPTION

[0025] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0026] In the present disclosure, unless otherwise specified, directional words such as "inside" and "outside" refer to the inside and outside relative to the outline of the component or structure itself, and "first" and "second" are used to distinguish one element from another and have no order or importance. In addition, the same figure marks in different reference drawings represent the same elements.

[0027] In a first aspect of the present disclosure, there is provided an inner insert of a heat exchange tube, referring to Figures 1 to 6 As shown, the inner plug-in is used to be inserted into the tube body 3 of the heat exchange tube, and the inner plug-in includes a central axis 4 and a first flow guide structure 1 and a second flow guide structure 2 alternately arranged along the length direction of the central axis 4, the first flow guide structure 1 includes a spiral flow guide plate 110 arranged along the length direction of the central axis 4, and the second flow guide structure 2 includes a second flow guide plate 210 extending along the length direction of the central axis 4.

[0028] Through the above scheme, that is, the insert provided by the present disclosure, after the insert is inserted into the tube body 3 of the heat exchange tube, the fluid in the tube body 3 will flow along the length direction of the tube body 3. During the flow process, the alternately arranged first flow guide structure 1 and the second flow guide structure 2 will continuously change the flow form of the fluid, that is, when the fluid passes through the first flow guide structure 1, the fluid flows forward in a spiral along the extension direction of the spiral guide plate 110, and when the fluid passes through the second flow guide structure 2, the fluid flows straight along the extension direction of the second guide plate 210. Under the alternating cycle of the above two flow modes, the fluid in the tube body 3 will cyclically change between the two states of axial flow and circumferential flow, which can repeatedly increase the turbulent effect of the fluid, and can also reduce or even avoid the formation of a laminar boundary layer of the fluid on the tube wall, thereby preventing scaling in the tube.

[0029] In the above-mentioned specific embodiment, the shaft diameter of the central shaft 4 can also be selected according to the diameter of the heat exchange tube, and can also be made into either a solid shaft or a hollow shaft according to the size of the shaft diameter. For example, when the shaft diameter of the central shaft 4 is less than or equal to 2 mm, the central shaft 4 can be directly made into a solid shaft for ease of processing. When the shaft diameter of the central shaft 4 is greater than or equal to 2 mm, the central shaft 4 can be made into a hollow shaft to save materials.

[0030] In addition, the axial projection surface of the spiral guide plate 110 mentioned in the above specific embodiment is circular, and its maximum diameter can be slightly smaller than the inner diameter of the tube body 3. In this way, when the spiral guide plate 110 is assembled with the tube body 3, the spiral guide plate 110 can be more conveniently inserted into the interior of the tube body 3, thereby improving the convenience of assembly.

[0031] In some embodiments, reference Figure 1 and Figure 2 As shown, the second guide plate 210 includes a guide portion 211 and a support guard plate 212. The guide portion 211 is connected to the central axis 4 and extends in a direction away from the central axis 4; the support guard plate 212 is connected to one end of the guide portion 211 away from the central axis 4, and the outer end surface of the support guard plate 212 facing away from the guide portion 211 is constructed as an arc surface. In this way, the guide portion 211 extends in a direction away from the central axis 4, and the support guard plate 212 can be fitted to the tube body 3, so that the entire second guide plate 210 can be more stably accommodated inside the tube body 3, and the tube body 3 can better support the inner plug-in to guide the fluid passing through the second guide structure 2, that is, when the fluid flows out of the spiral guide plate 110 and flows to the second guide plate 210, the fluid can change its flow direction under the stop of the guide portion 211, so that the fluid changes from spiral flow to axial movement along the length direction of the tube body 3, thereby changing the flow form of the fluid and achieving the purpose of enhancing turbulence. At the same time, the support guard plate 212 with an arc surface can also better match the inner wall of the tube body 3. At the same time, in order to better cooperate with the inner wall of the tube body 3, the arc center of the arc-shaped surface of the support guard plate 212 can be coaxial with the center of the central axis, so that the curvature of the arc-shaped surface can be the same or nearly the same as the curvature of the tube body 3, and thus can better cooperate with the inner wall of the tube body 3. When the arc-shaped surface is in contact with the inner wall of the tube body 3, the second guide plate 210 can be more stably installed inside the tube body 3. At the same time, the arc-shaped surface of the support guard plate 212 can also protect the inner wall of the tube body 3 when the second guide plate 210 produces a slight axial movement or radial movement due to the flow of fluid in the tube body 3, or when the inner plug-in is installed, thereby preventing the second guide plate 210 from scratching the inner wall of the tube body 3 when it moves relative to the tube body 3.

[0032] It should be noted that the outer end surface of the support guard plate 212, that is, the arc surface mentioned in the above specific embodiment, can also leave a certain gap with the inner wall of the tube body 3, so that it is easier to install the entire second guide plate 210 into the tube body 3.

[0033] In some embodiments, reference Figure 1 and Figure 2 As shown, the number of the guide portions 211 and the number of the supporting guard plates 212 are the same and are both at least two. In this way, the guide part 211 can guide the fluid passing through the second guide structure 2 along the length direction of the central axis 4. Before this process, since the fluid will still retain a slightly weak spiral forward trend after flowing out of the spiral guide plate 110 of the first guide structure 1, the guide part 211 can change the flow direction of the spirally forward fluid, so that the fluid in the spiral flow direction is hindered to a certain extent, and the axial flow velocity is increased. Under the alternating arrangement of the first guide structure 1 and the second guide structure 2, the spiral forward flow velocity and the axial flow velocity of the fluid increase and decrease, and circulate back and forth, which is conducive to intensifying the turbulent effect of the fluid, thereby preventing scaling on the inner wall of the heat exchange tube. At the same time, at least two support guard plates 212 can be connected to the two guide parts 211 one by one, and support the inner wall of the tube body 3 at the same time, thereby improving the rigidity of the tube body 3 of the heat exchange tube to a certain extent, and the second guide plate 210 can be more stably installed in the tube body 3.

[0034] It should be noted that the number of the guide portion 211 and the supporting guard plate 212 is not limited to two in the above specific embodiment. Figure 2 As shown, the number of the guide parts 211 and the support guard plates 212 can be four, and the four guide parts 211 and the four support guard plates 212 are connected to the central axis 4 at intervals in the circumferential direction, and each guide part 211 is arranged at an interval of 90° along the circumferential direction. Similarly, each support guard plate 212 is also arranged at an interval of 90° along the circumferential direction. In this way, the four guide parts 211 can guide the fluid flowing out of the spiral guide plate 110. For example, you can refer to Figure 2 As shown, when the fluid flows through the guide portion 211 , the fluid can change its flow direction under the stop of the guide portion 211 , so that the fluid changes from spiral flow to axial movement.

[0035] In addition, the number of four guide parts 211 and support guard plates 212 is exemplary. In embodiments not shown in the drawings of the specification, the number of guide parts 211 and support guard plates 212 can also be three, five or more, as long as they can satisfy the axial flow guidance of the fluid. The present disclosure does not make any specific limitation on this.

[0036] In some embodiments, reference Figure 1As shown, the guide portion 211 is provided with a plurality of channel holes B arranged at intervals along the length direction of the central axis 4 . In this way, the multiple channel holes B can play a role in mixing the fluid when it passes through the guide part 211, that is, as mentioned in the above specific implementation mode, when the fluid flows out from the spiral guide plate 110 of the first guide structure 1, it will still retain a slightly weaker spiral forward trend. At this time, when the fluid passes through the guide part 211, a part of the fluid will change its flow direction under the stop of the guide part 211, that is, from the original spiral flow to axial flow, and the other part of the fluid that maintains a slightly weaker spiral forward trend will also pass through the multiple channel holes B under the setting of the multiple channel holes B and continue to maintain a slightly weaker spiral forward trend. The two parts of the fluid have different flow directions when passing through the guide part 211, which can improve the turbulent effect of the fluid, thereby preventing the inner wall of the tube body 3 from scaling, and can further reduce or even avoid the laminar flow phenomenon on the inner wall of the tube body 3. At the same time, by setting a plurality of channel holes B, the weight of the guide part 211 itself can be further reduced, thereby achieving a lightweight effect.

[0037] In some embodiments, reference Figure 3 and Figure 4 As shown, the spiral guide plate 110 is provided with a plurality of first guide holes A, and the first guide holes A are configured as circular holes and / or fan-shaped holes. In this way, the opening of the first guide hole A can further increase the turbulence of the fluid when passing through the spiral guide plate 110. That is, it can be understood that when the fluid flows through the spiral guide plate 110, a part of the fluid will advance in a spiral along the surface of the spiral guide plate 110, and the other part of the fluid will pass through multiple first guide holes A and make a roughly axial movement. The fluid that flows roughly axially will be mixed again with the fluid that flows in a spiral manner in the next pitch. Under this flow mode, the turbulence of the fluid will be further improved, and the fluid can be effectively controlled to form a new laminar boundary layer in the spiral guide plate 110. On the premise of preventing scaling inside the heat exchange tube, the heat exchange efficiency of the heat exchange tube can also be improved. Furthermore, when different types of fluids are used in the heat exchange tube, the first guide hole A can be constructed into a hole type that is easier for the fluid to pass through according to the fluid's own viscosity. For example, when the viscosity of the fluid is large, a fan-shaped hole can be used for the fluid to pass through, that is Figure 4 The effect shown; when the viscosity of the fluid is small, a circular hole can be used for the fluid to pass through, that is, Figure 3 The effect shown.

[0038] In some embodiments, reference Figure 4 As shown, the inner arc edge and / or the outer arc edge of the fan-shaped hole are parallel to the outer edge of the spiral guide plate 110. In this way, the processing of the fan-shaped hole can be facilitated, and the cross-sectional area of ​​the fan-shaped hole can be increased, thereby increasing the flow rate of the fluid and improving the turbulence effect.

[0039] In some embodiments, reference Figure 1 and Figure 2 As shown, the maximum radial length of the second guide plate 210 in the radial direction of the central axis 4 is greater than the maximum radial length of the spiral guide plate 110 in the radial direction of the central axis 4. In this way, during the process of inserting the inner plug into the tube body, the spiral guide plate can be prevented from scratching the inner wall surface of the tube body, and the spiral guide plate and the tube body are protected to a certain extent.

[0040] In a second aspect of the present disclosure, a heat exchange tube is provided, referring to Figures 1 to 6 As shown, the heat exchange tube includes a tube body 3 and the inner plug-in mentioned in the above specific embodiments, and the heat exchange tube has all the beneficial effects in the above specific embodiments. When heat is exchanged through the heat exchange tube, since the inner plug-in is located in the tube body 3, the first flow guiding structure 1 and the second flow guiding structure 2 of the inner plug-in will continuously change the flow form of the fluid, increase the turbulence of the fluid, and thus reduce scaling on the inner wall of the tube body 3, thereby improving the heat exchange efficiency.

[0041] In some embodiments, reference Figure 5 and Figure 6 As shown, the heat exchange tube further includes a support member 5, and the inner plug is connected to the tube body 3 via the support member 5. In this way, the support member 5 is located in the tube body 3, which can firstly fix the axial position of the inner plug relative to the tube body 3, and secondly support the inner wall of the tube body 3, thereby improving the rigidity of the tube body 3.

[0042] In other embodiments, the relative position of the support member 5 and the tube body 3 and the number of the support members 5 themselves can be arbitrarily appropriate. For example, the number of the support members 5 can be multiple and can be arranged at intervals along the length direction of the tube body 3 to support multiple sections of the tube body 3 together, thereby improving the overall stiffness of the tube body 3. Alternatively, the support member 5 can also be arranged one at each end of a single-segment tube body 3 to support the two ends of the tube body 3, thereby improving the stiffness of the ends of the tube body 3.

[0043] In addition, the support member 5 mentioned in the above specific embodiments can be constructed into any suitable structure according to the different shapes of the tube body 3, and the present disclosure does not make any specific limitation on this. Figure 6 In the embodiment shown, the support member 5 can be constructed as a support rib connected to the central axis 4, one end of the support rib is connected to the central axis 4, and the other end extends in a direction away from the central axis 4 and is connected to the inner wall of the tube body 3, thereby supporting the inner wall of the tube body 3, and the number of the support ribs can also be one or more. Figure 6In the illustrated embodiment, there are four support ribs, which are arranged axially around the central axis 4, and the spacing angle of each support rib is 90°. In this way, the four support ribs can jointly provide circumferential support to the tube body 3, further improving the rigidity of the tube body 3.

[0044] According to a third aspect of the present disclosure, a heat exchanger is provided, which includes the heat exchange tubes mentioned in the above specific embodiments, wherein the heat exchanger can be a shell and tube heat exchanger, an air cooler or any other heat exchanger that requires heat exchange tubes as heat exchange scaling for heat exchange.

[0045] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0046] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0047] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An inner plug of a heat exchange tube, characterized in that: Used to be inserted into the tube body of the heat exchange tube, the inner plug-in includes a central axis and a first flow guide structure and a second flow guide structure alternately arranged along the length direction of the central axis, the first flow guide structure includes a spiral flow guide plate arranged along the length direction of the central axis, and the second flow guide structure includes a second flow guide plate extending along the length direction of the central axis.

2. The inner plug-in according to claim 1, characterized in that: The second guide plate comprises: A guide portion connected to the central axis and extending in a direction away from the central axis; A support guard plate is connected to one end of the air guide portion away from the central axis, and an outer end surface of the support guard plate facing away from the air guide portion is configured as an arc surface.

3. The inner plug-in according to claim 2, characterized in that: The number of the guide parts and the number of the supporting guard plates are the same and are both at least two.

4. The inner plug-in according to claim 3, characterized in that: The guide portion is provided with a plurality of channel holes which are arranged at intervals along the length direction of the central axis.

5. The inner plug-in according to claim 1, characterized in that: The spiral guide plate is provided with a plurality of first guide holes, and the first guide holes are configured as circular holes and / or fan-shaped holes.

6. The inner plug-in according to claim 5, characterized in that: The inner arc edge and / or the outer arc edge of the fan-shaped hole are parallel to the outer edge of the spiral guide plate.

7. The insert according to claim 1, characterized in that: The maximum radial length of the second guide plate in the radial direction of the central axis is greater than the maximum radial length of the spiral guide plate in the radial direction of the central axis.

8. A heat exchange tube, characterized in that: The invention comprises a tube body and an inner plug-in as claimed in any one of claims 1 to 7.

9. The heat exchange tube according to claim 8, characterized in that: The heat exchange tube further comprises a support member, and the inner plug-in unit is connected to the tube body via the support member.

10. A heat exchanger, characterized in that: Comprising the heat exchange tube according to claim 8 or 9.

Images