Sealing device of heat exchange tube and inner tube plate and double tube plate heat exchanger

Abstract

The utility model belongs to heat exchange technical field, concretely relates to a sealing device of heat exchange tube and inner tube plate and double tube plate heat exchanger. The sealing device of heat exchange tube and inner tube plate includes: sealing ring, is sleeved in heat exchange tube and is embedded in first installation groove, liquid guide plug, is sleeved in heat exchange tube and is embedded in second installation groove, and liquid guide plug is located one side of sealing ring, first expansion joint is located in heat exchange tube, wherein, along the radial direction of heat exchange tube, the projection of first expansion joint on heat exchange tube overlaps the projection of sealing ring on heat exchange tube, and the projection of first expansion joint on heat exchange tube partially overlaps the projection of liquid guide plug on heat exchange tube.

Description

Technical Field

[0001] This application belongs to the field of heat exchange technology, specifically relating to a sealing device between a heat exchange tube and an inner tube sheet, and a double tube sheet heat exchanger. Background Technology

[0002] In certain plants in the petrochemical and pharmaceutical industries, double-tube-sheet heat exchangers are frequently used to prevent cross-contamination and leakage between the shell and tube sides of the medium, as required by process operations. The outer tube sheet of a double-tube-sheet heat exchanger is connected to the heat exchange tubes using a combination of strength welding and expansion joints. Due to structural limitations, the inner tube sheet of a double-tube-sheet heat exchanger cannot be connected using conventional welding methods; instead, it must be connected to the heat exchange tubes using a strength expansion joint.

[0003] GB / T151-2014 specifies that the design pressure range for strength expansion joints is less than or equal to 4.0 MPa. When the design pressure exceeds 4.0 MPa, if a strength expansion joint must be used, an expansion joint process test must be conducted and passed, and the pull-out force of the heat exchange tube and tube sheet connection must also meet the corresponding requirements.

[0004] In related technologies, it is common to encounter situations where the shell-side design pressure of a double tube sheet heat exchanger is high. When the shell-side design pressure is high, the ordinary strength expansion connection between the inner tube sheet and the heat exchange tubes is difficult to guarantee the sealing performance. This may result in the inability to maintain pressure during the hydrostatic test or leakage during use, which limits the use of the double tube sheet heat exchanger at higher pressures. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a sealing device for heat exchange tubes and inner tube sheets, as well as a double tube sheet heat exchanger, aiming to at least partially solve the technical problem of a high risk of leakage between heat exchange tubes and inner tube sheets.

[0006] The technical solution of this utility model is as follows:

[0007] A sealing device for a heat exchange tube and an inner tube sheet, and a double tube sheet heat exchanger, are disclosed. The inner tube sheet has an installation hole through which the heat exchange tube passes. The wall of the installation hole has a first installation groove and a second installation groove communicating with the first installation groove. The second installation groove extends from the end of the installation hole toward the first installation groove. The sealing device for the heat exchange tube and the inner tube sheet includes: a sealing ring, sleeved on the heat exchange tube and embedded in the first installation groove; a liquid guide plug, sleeved on the heat exchange tube and embedded in the second installation groove, the liquid guide plug being located on one side of the sealing ring; and a first expansion joint, disposed inside the heat exchange tube. Specifically, along the radial direction of the heat exchange tube, the projection of the first expansion joint on the heat exchange tube overlaps with the projection of the sealing ring on the heat exchange tube, and the projection of the first expansion joint on the heat exchange tube partially overlaps with the projection of the liquid guide plug on the heat exchange tube.

[0008] In some embodiments, the first mounting groove includes a first sealing bevel, a supporting bevel, and a bottom surface connected to the first sealing bevel and the supporting bevel. The sealing ring has a second sealing bevel, an inner ring surface, an outer ring surface, and a supporting surface. The two ends of the inner ring surface are respectively connected to the second sealing bevel and the supporting surface, and the two ends of the outer ring surface are respectively connected to the second sealing bevel and the supporting surface. The second sealing bevel abuts against the first sealing bevel, the supporting surface abuts against the supporting bevel and is located between the liquid guide plug and the second sealing bevel, the inner ring surface abuts against the heat exchange tube, and the outer ring surface is spaced apart from the bottom surface to form a chamber.

[0009] In some embodiments, the support surface includes: a first segment connected to the outer annular surface and inclined, the first segment abutting against the support inclined surface; and a second segment connected to the first segment and the inner annular surface and abutting against the liquid guide plug.

[0010] In some embodiments, along the axial direction of the heat exchange tube, the liquid guide plug has a liquid guide channel extending through the liquid guide plug, and along the radial direction of the heat exchange tube, the support surface has a liquid guide groove; wherein, the liquid guide groove connects the liquid guide channel and the chamber.

[0011] In some embodiments, the second sealing bevel is provided with a plurality of first sealing grooves, and the inner annular surface is provided with a plurality of second sealing grooves.

[0012] In some embodiments, the liquid guide plug includes: a limiting portion located outside the mounting hole and abutting against the end of the inner tube sheet; and a blocking portion connected to the limiting portion and embedded in the second mounting groove, wherein the blocking portion abuts against the sealing ring.

[0013] In some embodiments, along the direction from the limiting portion toward the sealing ring, the second mounting groove includes an expansion surface and a connecting surface connected to the expansion surface, wherein the distance between the expansion surface and the central axis of the heat exchange tube is greater than the distance between the connecting surface and the central axis of the heat exchange tube; wherein, the inner circumferential surface of the plug portion is provided with a first expansion groove communicating with the first mounting groove, and along the radial direction of the heat exchange tube, the projection of the expansion surface on the heat exchange tube overlaps with the projection of the first expansion groove on the heat exchange tube.

[0014] In some embodiments, the wall of the mounting hole is provided with a second expansion groove that communicates with the first mounting groove, and the first mounting groove is located between the second expansion groove and the second mounting groove; wherein, along the radial direction of the heat exchange tube, the projections of the second expansion groove, the first mounting groove, and the expansion surface on the heat exchange tube overlap with the projection of the first expansion joint on the heat exchange tube.

[0015] In some embodiments, a third expansion groove is formed in the wall of the mounting hole, the first mounting groove and the third expansion groove are spaced apart, and a second expansion joint is provided inside the heat exchange tube; along the radial direction of the heat exchange tube, the projection of the third expansion groove on the heat exchange tube overlaps with the projection of the second expansion joint on the heat exchange tube.

[0016] Based on the same inventive concept, this application also provides a dual tube sheet heat exchanger, including a sealing device between the heat exchange tubes and the inner tube sheet.

[0017] The beneficial effects of this utility model include at least the following:

[0018] Because the inner tube sheet has mounting holes, the heat exchange tubes pass through the mounting holes. The mounting hole wall has a first mounting groove and a second mounting groove communicating with the first mounting groove. The second mounting groove extends from the end of the mounting hole toward the first mounting groove. The sealing ring is sleeved on the heat exchange tube and embedded in the first mounting groove. The liquid guide plug is sleeved on the heat exchange tube and embedded in the second mounting groove. The liquid guide plug is located on one side of the sealing ring. Therefore, the two ends of the inner tube sheet are the shell side and the isolation chamber side of the double tube sheet heat exchanger, respectively. When a seal is to be achieved between the inner tube sheet and the heat exchange tubes, the sealing ring is installed in the first mounting groove. The liquid guide plug is inserted from the shell side through the end of the mounting hole so that the liquid guide plug is embedded in the second mounting groove and located on one side of the sealing ring to cover the sealing ring and ensure the stability of the sealing ring installation. Then the heat exchange tubes are passed through the mounting holes. At this time, the sealing ring is sleeved on the heat exchange tubes.

[0019] Because the first expansion joint is located inside the heat exchange tube, its projection on the heat exchange tube overlaps with the projection of the sealing ring on the heat exchange tube along the radial direction of the heat exchange tube. The projection of the first expansion joint on the heat exchange tube also partially overlaps with the projection of the liquid guide plug on the heat exchange tube. Therefore, when the first expansion joint is installed inside the heat exchange tube and pressurized, it expands, causing deformation of the tube wall where it contacts the heat exchange tube. The tube wall moves towards the sealing ring, ensuring a tight fit between the sealing ring and the tube wall. Simultaneously, the deformation force of the tube wall allows the sealing ring to fit tightly against the wall of the first mounting groove. When the medium reaches the shell side, leakage from the gap between the heat exchange tube and the inner tube sheet is prevented. The combined effect of the sealing ring and the first expansion joint ensures the sealing performance between the heat exchange tube and the inner tube sheet, enabling the shell-side design pressure of the dual tube sheet heat exchanger to exceed 4 MPa, ensuring its operation at higher pressures. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the sealing device between the heat exchange tube and the inner tube sheet in some embodiments;

[0022] Figure 2 for Figure 1 Enlarged schematic diagram of point A of the sealing device between the heat exchanger tube and the inner tube sheet;

[0023] Figure 3 for Figure 2 A schematic diagram of the sealing ring structure of the sealing device between the heat exchanger tubes and the inner tube sheet;

[0024] Figure 4 for Figure 2 A schematic diagram of the inner tube sheet structure of the sealing device between the heat exchange tubes and the inner tube sheet;

[0025] Figure 5 for Figure 2 A schematic diagram of the liquid guide plug of the sealing device between the heat exchange tube and the inner tube sheet;

[0026] Figure 6 for Figure 5 Cross-sectional view of the central guide plug.

[0027] In the attached image:

[0028] Heat exchange tube 10;

[0029] Inner tube plate 20, mounting hole 21, first mounting groove 22, first sealing slope 221, supporting slope 222, bottom surface 223, second mounting groove 23, expansion joint surface 231, connecting surface 232, chamber 24, second expansion joint groove 25, third expansion joint groove 26;

[0030] Sealing ring 30, second sealing slope 31, inner ring surface 32, outer ring surface 33, support surface 34, first section 341, second section 342, liquid guiding groove 35, first sealing groove 36, second sealing groove 37;

[0031] Liquid guide plug 40, liquid guide channel 41, limiting part 42, blocking part 43, first expansion groove 431. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that all directional indications in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0036] This application is described below with reference to the accompanying drawings and specific embodiments:

[0037] The sealing device for heat exchange tubes and inner tube sheet and the double tube sheet heat exchanger provided in this embodiment are intended to at least partially solve the technical problem of the high risk of leakage between heat exchange tubes and inner tube sheet.

[0038] Figure 1 This is a schematic diagram of the sealing device between the heat exchange tube and the inner tube sheet in some embodiments; Figure 2 for Figure 1 Enlarged schematic diagram of point A of the sealing device between the heat exchanger tube and the inner tube sheet. (Combined with...) Figure 1 and Figure 2 In this embodiment, the inner tube sheet 20 has a mounting hole 21, through which the heat exchange tube 10 passes. The wall of the mounting hole 21 has a first mounting groove 22 and a second mounting groove 23 communicating with the first mounting groove 22. The second mounting groove 23 extends from the end of the mounting hole 21 towards the first mounting groove 22. The sealing device between the heat exchange tube 10 and the inner tube sheet 20 in this embodiment includes a sealing ring 30, a liquid guide plug 40, and a first expansion joint. The sealing ring 30 is sleeved on the heat exchange tube 10 and embedded in the first mounting groove 22. The liquid guide plug 40 is sleeved on the heat exchange tube 10 and embedded in the second mounting groove 23, with the liquid guide plug 40 located on one side of the sealing ring 30. The first expansion joint is located inside the heat exchange tube 10. Along the radial direction of the heat exchange tube 10, the projection of the first expansion joint on the heat exchange tube 10 overlaps with the projection of the sealing ring 30 on the heat exchange tube 10, and the projection of the first expansion joint on the heat exchange tube 10 partially overlaps with the projection of the liquid guide plug 40 on the heat exchange tube 10.

[0039] Because the inner tube sheet 20 has mounting holes 21, the heat exchange tube 10 passes through the mounting holes 21. The wall of the mounting hole 21 has a first mounting groove 22 and a second mounting groove 23 communicating with the first mounting groove 22. The second mounting groove 23 extends from the end of the mounting hole 21 toward the first mounting groove 22. The sealing ring 30 is sleeved on the heat exchange tube 10 and embedded in the first mounting groove 22. The liquid guide plug 40 is sleeved on the heat exchange tube 10 and embedded in the second mounting groove 23. The liquid guide plug 40 is located on one side of the sealing ring 30, serving the function of installing the sealing ring. Therefore, the two ends of the inner tube sheet 20 are the shell side and the isolation chamber side of the double tube sheet heat exchanger, respectively. When the inner tube sheet 20 and the heat exchange tube 10 are to be sealed, the sealing ring 30 is installed in the first mounting groove 22, and the liquid guide plug 40 is inserted from the shell side through the end of the mounting hole 21 so that the liquid guide plug 40 is embedded in the second mounting groove 23 and located on one side of the sealing ring 30 to cover the sealing ring 30 and ensure the stability of the installation of the sealing ring 30. Then the heat exchange tube 10 is passed through the mounting hole 21. At this time, the sealing ring 30 is sleeved on the heat exchange tube 10.

[0040] Since the first expansion joint is located inside the heat exchange tube 10, its projection on the heat exchange tube 10 overlaps with the projection of the sealing ring 30 on the heat exchange tube 10 along the radial direction of the heat exchange tube 10. The projection of the first expansion joint on the heat exchange tube 10 also partially overlaps with the projection of the liquid guide plug 40 on the heat exchange tube 10. Therefore, when the first expansion joint is installed inside the heat exchange tube 10 and pressurized, it expands, causing deformation of the tube wall of the heat exchange tube 10 that abuts against the first expansion joint. The tube wall of the heat exchange tube 10 moves towards the sealing ring 30, thus sealing... The sealing ring 30 fits tightly against the wall of the heat exchange tube 10. At the same time, under the deformation force of the heat exchange tube 10 wall, the sealing ring 30 fits tightly against the wall of the first mounting groove 22. When the medium reaches the shell side, it can prevent the medium from leaking through the gap between the heat exchange tube 10 and the inner tube sheet 20. With the synergistic effect of the sealing ring 30 and the first expansion joint, the sealing performance between the heat exchange tube 10 and the inner tube sheet 20 is guaranteed, so that the shell side design pressure of the double tube sheet heat exchanger exceeds 4MPa, ensuring that the double tube sheet heat exchanger can be used under higher pressure.

[0041] Figure 3 for Figure 2 A schematic diagram of the sealing ring structure of the sealing device between the heat exchanger tube and the inner tube sheet. Figure 4 for Figure 2 A schematic diagram of the inner tube sheet structure of the sealing device between the heat exchanger tubes and the inner tube sheet. (Combined with...) Figure 2 , Figure 3 and Figure 4 To further ensure a good seal, the first mounting groove 22 includes a first sealing slope 221, a supporting slope 222, and a bottom surface 223 connected to the first sealing slope 221 and the supporting slope 222. The sealing ring 30 has a second sealing slope 31, an inner ring surface 32, an outer ring surface 33, and a supporting surface 34. The two ends of the inner ring surface 32 are connected to the second sealing slope 31 and the supporting surface 34, respectively, and the two ends of the outer ring surface 33 are connected to the second sealing slope 31 and the supporting surface 34, respectively. The second sealing slope 31 abuts against the first sealing slope 221, the supporting surface 34 abuts against the supporting slope 222, and is located between the liquid guide plug 40 and the second sealing slope 31. The inner ring surface 32 abuts against the heat exchange tube 10, and the outer ring surface 33 is spaced apart from the bottom surface 223 to form a chamber 24.

[0042] When the liquid guide plug 40 is located on one side of the support surface 34, along the axial direction of the heat exchange tube 30, the liquid guide plug 40 and the first sealing inclined surface 221 work together to limit the sealing ring 30 and ensure the stability of the sealing ring 30 installation.

[0043] Along the direction from the liquid guide plug 40 to the sealing ring 30, the liquid guide plug 40 applies a thrust to the support surface 34. This thrust is transmitted to the second sealing slope 31, causing the second sealing slope 31 to fit tightly against the first sealing slope 221. Simultaneously, this thrust is decomposed into a first force and a second force under the action of the second sealing slope 31 and the first sealing slope 221. The first force is applied to the second sealing slope 31 and the first sealing slope 221 along the direction from the liquid guide plug 40 to the sealing ring 30, ensuring that the second sealing slope 31 and the first sealing slope 221 are always in tight contact, preventing the medium from leaking between the second sealing slope 31 and the first sealing slope 221. The second force is applied to the inner ring surface 32 along the wall of the mounting hole 21 towards the heat exchange tube 10, ensuring that the inner ring surface 32 and the heat exchange tube 10 are always in tight contact, preventing the medium from leaking between the inner ring surface 32 and the heat exchange tube 10, thus ensuring the sealing performance and further guaranteeing the sealing effect.

[0044] When the sealing ring 30 is installed in the first mounting groove 22, the supporting surface 34 can be guided by the supporting inclined surface 22 to facilitate the entry of the sealing ring 30 into the first mounting groove 22, improving installation efficiency. After the sealing ring 30 is installed in the first mounting groove 22, since the supporting surface 34 abuts against the supporting inclined surface 222, that is, the sealing ring 30 is located between the first sealing inclined surface 221 and the supporting inclined surface 222, the first sealing inclined surface 221 and the supporting inclined surface 222 limit the sealing ring 30, ensuring the stability of the installation of the sealing ring 30. Moreover, when the liquid guide plug 40 is inserted into the end of the mounting hole 21 on the shell side, along the axial direction of the heat exchange tube 30, the liquid guide plug 40 and the first sealing inclined surface 221 work together to limit the sealing ring 30, ensuring the stability of the installation of the sealing ring 30.

[0045] In some embodiments, along the direction from the liquid guide plug 40 to the sealing ring 30, the distance between the first sealing inclined surface 221 and the central axis of the heat exchange tube 10 gradually decreases, while the distance between the supporting inclined surface 222 and the central axis of the heat exchange tube 10 gradually increases.

[0046] In some embodiments, to facilitate the entry of the liquid guide plug 40 into the second mounting groove 23, a chamfer is provided at the end of the second mounting groove 23 away from the first mounting groove 22. The chamfer enlarges the opening of the second mounting groove 23, which facilitates the installation of the liquid guide plug 40 and improves the installation efficiency. At the same time, the chamfer can guide the liquid guide plug 40, allowing it to be smoothly inserted into the second mounting groove 23, which further improves the installation efficiency.

[0047] In some embodiments, combined with Figure 3To ensure a tight fit between the support surface 34 and the support slope 222, the support surface 34 includes a first segment 341 and a second segment 342. The first segment 341 is connected to the outer annular surface 33 and is inclined, and the first segment 341 abuts against the support slope 222. The second segment 342 is connected to the first segment 341 and the inner annular surface 32, and is located on one side of the liquid guide plug 40. The second segment 342 extends radially along the heat exchange tube 10.

[0048] When the sealing ring 30 is installed in the first mounting groove 22, the supporting inclined surface 222 guides the first segment 341, facilitating the entry of the sealing ring 30 into the first mounting groove 22 and improving installation efficiency. After the sealing ring 30 is installed in the first mounting groove 22, since the first segment 341 abuts against the supporting inclined surface 222, that is, the sealing ring 30 is located between the first sealing inclined surface 221 and the supporting inclined surface 222, the first sealing inclined surface 221 and the supporting inclined surface 222 limit the sealing ring 30, ensuring the stability of the installation of the sealing ring 30.

[0049] When the liquid guide plug 40 is located on one side of the second section 342, along the axial direction of the heat exchange tube 30, the liquid guide plug 40 and the first sealing inclined surface 221 work together to limit the sealing ring 30 and ensure the stability of the sealing ring 30 installation.

[0050] In some embodiments, the distance between the first segment 341 and the central axis of the heat exchange tube 10 gradually increases along the direction from the liquid guide plug 40 to the sealing ring 30.

[0051] Figure 5 for Figure 2 A schematic diagram of the liquid guide plug of the sealing device between the heat exchange tube and the inner tube sheet. Figure 6 for Figure 5 A cross-sectional schematic diagram of the central guide plug. In some embodiments, combined with Figure 2 , Figure 3 , Figure 5 and Figure 6 To further ensure a good seal, a liquid guiding channel 41 is provided through the liquid guiding plug 40 along the axial direction of the heat exchange tube 10, and a liquid guiding groove 35 is provided on the support surface 34 along the radial direction of the heat exchange tube 10. The liquid guiding groove 35 connects the liquid guiding channel 41 and the chamber 24.

[0052] When the medium reaches the shell side, it can reach the liquid guide channel 35 through the liquid guide channel 41 and enter the chamber 24 through the liquid guide channel 35. The medium pressure can act on the outer ring surface 33 and transmit the medium pressure to the inner ring surface 32, further making the inner ring surface 32 fit tightly with the heat exchange tube 10. This can prevent the medium from leaking through the gap between the heat exchange tube 10 and the inner tube sheet 20. With the synergistic effect of the sealing ring 30 and the first expansion joint, the sealing performance between the heat exchange tube 10 and the inner tube sheet 20 is guaranteed, so that the shell side design pressure of the double tube sheet heat exchanger exceeds 4MPa, ensuring that the double tube sheet heat exchanger can be used at higher pressures.

[0053] Combination Figure 3 To further ensure a good seal, multiple first sealing grooves 36 are provided on the second sealing slope 31. When a medium attempts to leak between the second sealing slope 31 and the first sealing slope 221, the presence of the first sealing grooves 36 changes the flow direction of the medium. After the medium enters the first sealing groove 36, its flow is hindered, requiring it to overcome greater resistance to continue leaking, thus reducing the possibility of leakage. Moreover, the multiple first sealing grooves 36 effectively increase the path length of the medium leakage. The medium needs to pass through multiple first sealing grooves 36 to completely leak out. During this process, the pressure of the medium gradually decreases, further reducing the possibility of leakage. The multiple first sealing grooves 36 are arranged side-by-side with intervals.

[0054] Combination Figure 3 To further ensure a good seal, the inner annular surface 32 is provided with multiple second sealing grooves 37. When a medium attempts to leak between the inner annular surface 32 and the heat exchange tube 10, the presence of the second sealing grooves 37 changes the flow direction of the medium. After the medium enters the second sealing grooves 37, its flow is hindered, and it needs to overcome greater resistance to continue leaking, thereby reducing the possibility of leakage. Moreover, multiple second sealing grooves 37 effectively increase the path length of the medium leakage. The medium needs to pass through multiple second sealing grooves 37 to completely leak out. During this process, the pressure of the medium gradually decreases, further reducing the possibility of leakage. The multiple second sealing grooves 37 are arranged side-by-side at intervals.

[0055] Combination Figure 2 and Figure 5 To ensure the stability of the liquid guide plug 40 during installation, the liquid guide plug 40 includes a limiting part 42 and a blocking part 43. The limiting part 42 is located outside the mounting hole 21 and abuts against the end of the inner tube plate 20. The blocking part 43 is connected to the limiting part 42 and is embedded in the second mounting groove 23, and the blocking part 43 abuts against the sealing ring 30.

[0056] The limiting part 42 is inserted into the plug part 43 through the mounting hole 21 from the shell side, so that the plug part 43 is embedded in the second mounting groove 23 and abuts against the sealing ring 30 to ensure the stability of the sealing ring 30 installation. After the plug part 43 is installed in the second mounting groove 23, the limiting part 42 is located outside the mounting hole 21 and abuts against the end of the inner tube plate 20. The limiting part 42 limits the plug part 43 to prevent excessive movement of the plug part 43.

[0057] In some embodiments, combined with Figure 2 , Figure 4 and Figure 5 To ensure the stability of the liquid guide plug 40 during installation, the second mounting groove 23, along the direction from the limiting portion towards the sealing ring 30, includes an expansion surface 231 and a connecting surface 232 connected to the expansion surface 231. The distance between the expansion surface 231 and the central axis of the heat exchange tube 10 is greater than the distance between the connecting surface 232 and the central axis of the heat exchange tube 10. The inner circumferential surface of the plug portion 43 is provided with a first expansion groove 431 communicating with the first mounting groove 22. Along the radial direction of the heat exchange tube 10, the projection of the expansion surface 231 on the heat exchange tube 10 overlaps with the projection of the first expansion groove 431 on the heat exchange tube 10.

[0058] When pressure is applied to the first expansion joint, it expands, causing deformation of the tube wall of the heat exchange tube 10 that abuts against the first expansion joint. The tube wall of the heat exchange tube 10 moves towards the second mounting groove 23. Under the deformation force of the tube wall of the heat exchange tube 10, the tube wall of the heat exchange tube 10 can enter the first expansion joint groove 431, and the tube wall of the heat exchange tube 10 abuts against the side wall of the first expansion joint groove 431, thereby limiting the blocking part 43 and ensuring the stability of the installation of the blocking part 43. At the same time, the tube wall of the heat exchange tube 10 will bring... The side wall of the first expansion groove 431 moves towards the expansion surface 231, which means that the blocking part 43 will also deform so that the blocking part 43 enters the expansion surface 231. Since the distance between the expansion surface 231 and the central axis of the heat exchange tube 10 is greater than the distance between the connecting surface 232 and the central axis of the heat exchange tube 10, a step is formed between the expansion surface 231 and the connecting surface 232. The blocking part 43 will abut against the step. Under the action of the step, the blocking part 43 is limited, ensuring the stability of the installation of the blocking part 43.

[0059] In some embodiments, combined with Figure 2 To further ensure a good seal, the wall of the mounting hole 21 is provided with a second expansion groove 25 that communicates with the first mounting groove 22. The first mounting groove 22 is located between the second expansion groove 25 and the second mounting groove 23. Along the radial direction of the heat exchange tube 10, the projections of the second expansion groove 25, the first mounting groove 22, and the expansion surface 231 on the heat exchange tube 10 overlap with the projection of the first expansion joint on the heat exchange tube 10.

[0060] When pressure is applied to the first expansion joint, the first expansion joint expands, causing the tube wall of the heat exchange tube 10 that abuts against the first expansion joint to deform. The tube wall of the heat exchange tube 10 moves towards the second expansion groove 25. Under the action of the deformation force of the tube wall of the heat exchange tube 10, the tube wall of the heat exchange tube 10 can enter the second expansion groove 25, and the tube wall of the heat exchange tube 10 abuts against the groove of the second expansion groove 25, realizing the expansion joint between the heat exchange tube 10 and the inner tube sheet 20, ensuring the sealing performance and improving the sealing effect.

[0061] In some embodiments, the second expansion groove 25 is annular, and the expansion surface 231 of the inner tube sheet 20 is annular. Before the first expansion joint is pressurized, the diameter of the second expansion groove 25 is larger than the diameter of the inner annular surface 31 of the sealing ring 30, to ensure that after the first expansion joint is pressurized, the sealing ring 30 can exert a force on the heat exchange tube 10 along the radial direction, ensuring a sealing effect. After the first expansion joint is pressurized, the diameter of the second expansion groove 25 is greater than or equal to the diameter of the inner annular surface 31 of the sealing ring 30, and the sealing ring 30 can exert a force on the heat exchange tube 10 along the radial direction, ensuring a sealing effect.

[0062] In some embodiments, combined with Figure 1 To further ensure a good seal, a third expansion groove 26 is provided in the wall of the mounting hole 21. The first mounting groove 22 and the third expansion groove 26 are spaced apart. A second expansion joint is provided inside the heat exchange tube 10. Along the radial direction of the heat exchange tube 10, the projection of the third expansion groove 26 on the heat exchange tube 10 overlaps with the projection of the second expansion joint on the heat exchange tube 10.

[0063] When pressure is applied to the second expansion joint, the second expansion joint expands, causing the tube wall of the heat exchange tube 10 that abuts against the second expansion joint to deform. The tube wall of the heat exchange tube 10 moves towards the third expansion groove 26. Under the action of the deformation force of the tube wall of the heat exchange tube 10, the tube wall of the heat exchange tube 10 can enter the third expansion groove 26, and the tube wall of the heat exchange tube 10 abuts against the groove of the third expansion groove 26, realizing the expansion joint between the heat exchange tube 10 and the inner tube sheet 20, ensuring the sealing performance and improving the sealing effect.

[0064] In some embodiments, the number of second expansion joints can be one or more. When the number of second expansion joints is multiple, the number of third expansion grooves 26 is also multiple. Multiple second expansion joints correspond one-to-one with multiple third expansion grooves. Along the radial direction of the heat exchange tube 10, the projection of the third expansion groove 26 on the heat exchange tube 10 overlaps with the projection of the corresponding second expansion joint on the heat exchange tube 10.

[0065] Based on the same inventive concept, this application also proposes a dual tube sheet heat exchanger, which employs a sealing device between the heat exchange tubes and the inner tube sheet. The specific structure of the sealing device between the heat exchange tubes and the inner tube sheet is as described in the above embodiments. Since all the technical solutions of the above embodiments are adopted, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0066] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0067] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0069] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0070] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A sealing device between a heat exchange tube and an inner tube sheet, characterized in that, The inner tube sheet has mounting holes, and the heat exchange tubes pass through the mounting holes. The wall of the mounting holes has a first mounting groove and a second mounting groove communicating with the first mounting groove. The second mounting groove extends from the end of the mounting hole toward the first mounting groove. The sealing device between the heat exchange tubes and the inner tube sheet includes: A sealing ring is fitted onto the heat exchange tube and embedded in the first mounting groove; A liquid guide plug is sleeved on the heat exchange tube and embedded in the second mounting groove, the liquid guide plug being located on one side of the sealing ring; The first expansion joint is located inside the heat exchange tube; Wherein, along the radial direction of the heat exchange tube, the projection of the first expansion joint on the heat exchange tube overlaps with the projection of the sealing ring on the heat exchange tube, and the projection of the first expansion joint on the heat exchange tube partially overlaps with the projection of the liquid guide plug on the heat exchange tube.

2. The sealing device between the heat exchange tube and the inner tube sheet according to claim 1, characterized in that, The first mounting groove includes a first sealing inclined surface, a supporting inclined surface, and a bottom surface connected to the first sealing inclined surface and the supporting inclined surface. The sealing ring has a second sealing inclined surface, an inner ring surface, an outer ring surface, and a supporting surface. The two ends of the inner ring surface are respectively connected to the second sealing inclined surface and the supporting surface, and the two ends of the outer ring surface are respectively connected to the second sealing inclined surface and the supporting surface. The second sealing inclined surface abuts against the first sealing inclined surface, the supporting surface abuts against the supporting inclined surface and is located between the liquid guide plug and the second sealing inclined surface, the inner annular surface abuts against the heat exchange tube, and the outer annular surface is spaced apart from the bottom surface to form a chamber.

3. The sealing device between the heat exchange tube and the inner tube sheet according to claim 2, characterized in that, The supporting surface includes: The first segment is connected to the outer ring surface and is inclined, and the first segment abuts against the supporting inclined surface; The second segment connects to the first segment and the inner annular surface, and abuts against the liquid guide plug.

4. The sealing device between the heat exchange tube and the inner tube sheet according to claim 2, characterized in that, Along the axial direction of the heat exchange tube, the liquid guide plug has a liquid guide channel extending through the liquid guide plug, and along the radial direction of the heat exchange tube, the support surface has a liquid guide groove. The liquid guiding groove connects the liquid guiding channel and the chamber.

5. The sealing device between the heat exchange tube and the inner tube sheet according to claim 2, characterized in that, The second sealing inclined surface has multiple first sealing grooves, and the inner annular surface has multiple second sealing grooves.

6. The sealing device between the heat exchange tube and the inner tube sheet according to any one of claims 1-5, characterized in that, The liquid-conducting plug includes: The limiting part is located outside the mounting hole and abuts against the end of the inner tube plate; The blocking part is connected to the limiting part and is embedded in the second mounting groove, and the blocking part abuts against the sealing ring.

7. The sealing device between the heat exchange tube and the inner tube sheet according to claim 6, characterized in that, Along the direction from the limiting portion to the sealing ring, the second mounting groove includes an expansion surface and a connecting surface connected to the expansion surface, wherein the distance between the expansion surface and the central axis of the heat exchange tube is greater than the distance between the connecting surface and the central axis of the heat exchange tube; The inner circumferential surface of the blockage portion is provided with a first expansion groove that communicates with the first mounting groove. Along the radial direction of the heat exchange tube, the projection of the expansion surface on the heat exchange tube overlaps with the projection of the first expansion groove on the heat exchange tube.

8. The sealing device between the heat exchange tube and the inner tube sheet according to claim 7, characterized in that, The mounting hole has a second expansion groove that communicates with the first mounting groove, and the first mounting groove is located between the second expansion groove and the second mounting groove. Wherein, along the radial direction of the heat exchange tube, the projections of the second expansion groove, the first mounting groove, and the expansion surface on the heat exchange tube overlap with the projection of the first expansion joint on the heat exchange tube.

9. The sealing device between the heat exchange tube and the inner tube sheet according to any one of claims 1-5, characterized in that, The wall of the mounting hole is provided with a third expansion groove, the first mounting groove and the third expansion groove are spaced apart, and the heat exchange tube is provided with a second expansion joint. Along the radial direction of the heat exchange tube, the projection of the third expansion groove on the heat exchange tube overlaps with the projection of the second expansion joint on the heat exchange tube.

10. A double tube sheet heat exchanger, characterized in that, Includes the sealing device between the heat exchange tube and the inner tube sheet as described in any one of claims 1-9.

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