Sealing shock insulator assembly for graphite heat exchanger pipe

Abstract

The utility model relates to a sealing spacer component for a graphite heat exchanger tube, which comprises an annular plate main body capable of being mounted between the graphite heat exchanger tube and a heat exchanger tube plate, the top of the annular plate body is provided with a positioning inner annular plate which can abut against the end face of a pipe body of the graphite heat exchange pipe to limit the sleeving position of the annular plate body on the graphite heat exchange pipe. A positioning outer ring plate which can abut against the lower surface of the heat exchanger tube plate to limit the relative position between the ring plate body and the heat exchanger tube plate is arranged at the bottom of the ring plate body. Rigid ring plate sleeves capable of limiting the connection state between the positioning inner ring plate and the graphite sleeve and the connection state between the positioning outer ring plate and the graphite sleeve are embedded in the axial upper end and the axial lower end of the graphite sleeve of the ring plate body respectively. According to the utility model, the structural strength can be enhanced and the shape of the sealing abutting surface can be optimized through the mutual matching of a plurality of barrier sealing structures, so that the sealing sufficiency and effect can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger sealing technology, and in particular to a sealing septum assembly for graphite heat exchanger tubes. Background Technology

[0002] Graphite heat exchangers are widely used in chemical, pharmaceutical, and other industries due to their excellent corrosion resistance and thermal conductivity. The seal between the graphite heat exchanger tubes and the tube sheet is crucial for ensuring the normal operation of the heat exchanger. Traditional sealing methods often use rubber O-rings or graphite gaskets. However, graphite gaskets alone suffer from poor structural strength and high brittleness. Although they have a relatively consistent coefficient of thermal expansion with the graphite heat exchanger tubes, they are extremely prone to breakage. After assembly with a large preload, the graphite gasket and heat exchanger tubes are easily damaged by operating vibrations and other forces. Furthermore, rubber O-rings alone have poor temperature resistance, are prone to aging and failure, and the significant difference in the coefficient of thermal expansion between a single rubber structure and graphite easily leads to seal failure.

[0003] Existing graphite heat exchangers typically use a single-structure assembly gap sealing gasket, which cannot guarantee sealing effectiveness under extreme conditions such as high pressure, strong corrosion, or drastic temperature fluctuations. This results in poor barrier performance. The single rubber material, due to differences in material expansion during temperature changes, cannot guarantee sufficient expansion and contraction, easily leading to gaps in the seal and compromising sealing effectiveness. Furthermore, the single graphite material is prone to plastic deformation under high pressure, causing seal failure. Poor sealing between the graphite heat exchange tubes and the tube sheet not only prevents effective media isolation and leakage, but also allows the leaked media to contaminate the heat dissipation material and corrode the shell. Moreover, the leaked media can crystallize in the gaps at the seal, making graphite heat exchange tube replacement difficult. Utility Model Content

[0004] The purpose of this invention is to provide a graphite heat exchanger tube sealing septum assembly that can enhance structural strength and optimize the morphology of the sealing contact surface through the cooperation of multiple barrier sealing structures, thereby ensuring the sufficiency and effectiveness of the seal. This solves the problems of poor sealing effect and inability to guarantee the sufficiency of the seal of existing single sealing structures, especially their inability to adapt to relatively extreme working conditions and their inability to guarantee the effectiveness of the seal under high pressure and significant temperature changes, thus failing to guarantee the stability of heat exchange operation.

[0005] The technical solution adopted by this utility model is as follows: a sealing septum assembly for graphite heat exchanger tubes, including an annular plate body that can be installed between the graphite heat exchanger tube and the heat exchanger tube sheet. The top of the annular plate body is provided with a positioning inner annular plate that can abut against the tube end face of the graphite heat exchanger tube and limit its fitting position on the graphite heat exchanger tube. The bottom of the annular plate body is provided with a positioning outer annular plate that can abut against the lower surface of the heat exchanger tube sheet and limit its relative position with the heat exchanger tube sheet. The upper and lower axial ends of the graphite sleeve of the annular plate body are respectively fitted with rigid annular plate sleeves that can limit the connection form between the positioning inner annular plate, the positioning outer annular plate and the graphite sleeve.

[0006] According to a preferred embodiment, a reinforcing wire mesh is embedded on the side surface of the graphite sleeve, and the reinforcing wire mesh is confined and isolated by an impermeable coating layer wrapped around at least a portion of the side surface of the graphite sleeve.

[0007] According to a preferred embodiment, the inner surface of the graphite sleeve is further provided with an annular protrusion capable of filling the gap between it and the outer wall of the graphite heat exchange tube, and an inner fitting annular groove for embedding the first annular air bladder; the outer surface of the graphite sleeve is further provided with an outer fitting annular groove for embedding the second annular air bladder.

[0008] According to a preferred embodiment, the graphite sleeve is further provided with a micro-channel for communicating with the first annular air bladder and the second annular air bladder.

[0009] According to a preferred embodiment, a first spiral protrusion is provided on the lower plate surface of the positioning inner ring plate to fill the abutment gap between it and the tube end face of the graphite heat exchange tube, and a first sealing gasket is also provided on the radial inner side of the first spiral protrusion.

[0010] According to a preferred embodiment, a second spiral protrusion is provided on the upper plate surface of the positioning outer ring plate to fill the abutment gap between it and the lower plate surface of the heat exchanger tube sheet, and a second sealing gasket is also provided on the radially outer side of the second spiral protrusion.

[0011] According to a preferred embodiment, an expansion bladder is also embedded on the upper surface of the positioning outer ring plate, and the expansion bladder is connected to the air guiding microtube.

[0012] According to a preferred embodiment, a lifting arc plate capable of inflating the bladder under initial conditions and a return spring supporting the lifting arc plate are provided inside the inflatable bladder.

[0013] According to a preferred embodiment, the rigid ring sleeve includes an upper ring sleeve extending radially inward and a lower ring sleeve extending radially outward.

[0014] According to a preferred embodiment, the surfaces of the upper and lower ring sleeves are further covered with an adhesive protective layer that can adhere to the graphite sleeve, the inner positioning ring plate, and / or the outer positioning ring plate.

[0015] The beneficial effects of this utility model are:

[0016] The reinforcing wire mesh provided in this application can suppress excessive plastic deformation of the graphite sleeve under high pressure. The anti-seepage coating layer can isolate the reinforcing wire mesh and prevent it from contacting the medium and being corroded and damaged. The first annular air bladder can cooperate with the annular protrusion to achieve a two-stage seal when it expands, thereby improving the sufficiency of the filling barrier and the sealing effect. When the graphite sleeve is assembled to the outside of the graphite heat exchange tube, the annular protrusion and the outer wall of the graphite heat exchange tube achieve full filling of the assembly gap through an interference fit. At this time, the graphite sleeve undergoes elastic deformation to form a reliable seal. When the second annular air bladder expands, it can effectively abut against the inner wall of the mounting hole of the heat exchanger tube sheet to fill the assembly gap between the graphite sleeve and the heat exchanger tube sheet, thereby achieving the effectiveness and sufficiency of the barrier. The gas guide microtube can transport the gas discharged when the expansion bladder is compressed and deformed, and deliver this gas to the first and second annular air bladders, so that the first and second annular air bladders receive the gas and expand to fill the assembly gap.

[0017] The spiral pattern formed by the first spiral protrusion can undergo plastic deformation during contact to fully fill the micro-defects between the inner positioning ring plate and the end face of the graphite heat exchange tube, thereby ensuring the sufficiency and effectiveness of the filling barrier to guarantee sealing performance. It can also effectively reduce contact stress to improve contact stability and structural life.

[0018] The spiral pattern formed by the second spiral protrusion can undergo plastic deformation during contact to fully fill the micro-defects between the contact surfaces of the positioning outer ring plate and the lower plate of the heat exchanger tube sheet, thereby ensuring the sufficiency and effectiveness of the filling barrier to guarantee sealing performance. It can also effectively reduce contact stress to improve contact stability and structural life.

[0019] The upper and lower ring sleeves can improve the connection stability and structural integrity of multi-turn plate-tube composite structures, and ensure the effectiveness of structural contact limiting and filling barrier.

[0020] This application combines expanded graphite with a rubber gasket structure, enabling the sealing septum to effectively fill assembly gaps and form a reliable seal while also effectively buffering strain to ensure structural stability, avoiding damage caused by excessive deformation under extreme working conditions, and improving service life and sealing effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a preferred graphite heat exchanger tube sealing diaphragm assembly proposed in this utility model;

[0022] Figure 2 This is a partial cross-sectional schematic diagram of a preferred graphite heat exchanger tube sealing septum assembly proposed in this utility model.

[0023] Figure 3 This is an enlarged structural schematic diagram of part A of a preferred graphite heat exchanger tube sealing septum assembly proposed in this utility model.

[0024] Figure 4 This is a plan view of the positioning inner ring plate of a preferred graphite heat exchanger tube sealing septum assembly proposed in this utility model.

[0025] List of reference numerals

[0026] 1: Ring plate body; 2: Graphite heat exchange tube; 3: Heat exchanger tube sheet; 4: Positioning inner ring plate; 5: Positioning outer ring plate; 6: Rigid ring plate sleeve; 11: Graphite sleeve; 12: Reinforcing wire mesh; 13: Leak-proof coating layer; 111: Annular protrusion; 112: Inner embedded ring groove; 113: Outer embedded ring groove; 114: First ring airbag; 115: Second ring airbag; 116: Air guiding microtube; 41: First spiral protrusion; 42: First sealing gasket; 51: Second spiral protrusion; 52: Second sealing gasket; 53: Expansion bladder; 531: Lifting arc plate; 532: Return spring; 61: Upper ring plate sleeve; 62: Lower ring plate sleeve; 63: Rubber protective layer. Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] The technical solutions provided by this utility model will be described in detail below with reference to the accompanying drawings and through embodiments. It should be noted that the descriptions of these embodiments are intended to aid in understanding this utility model, but do not constitute a limitation thereof. In some examples, because some implementation methods belong to existing or conventional technology, they are not described or are not described in detail.

[0029] Furthermore, the technical features described herein, or the steps in all the methods or processes disclosed herein, may be combined in any suitable manner in one or more embodiments, except for mutually exclusive features and / or steps. It will be readily understood by those skilled in the art that the order of steps or operations of the methods relating to the embodiments provided herein may also be altered. Any order in the drawings and embodiments is for illustrative purposes only and does not imply a requirement to follow a particular order unless explicitly stated otherwise.

[0030] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, under reasonable circumstances (without self-contradiction), include both direct and indirect connections (linkages).

[0031] The following is a detailed explanation with reference to the accompanying drawings.

[0032] Example 1

[0033] This application provides a sealing septum assembly for graphite heat exchanger tubes, which includes an annular plate body 1, a graphite heat exchanger tube 2, a heat exchanger tube sheet 3, a positioning inner annular plate 4, a positioning outer annular plate 5, and a rigid annular plate sleeve 6.

[0034] according to Figure 1-4In one specific embodiment, the annular plate body 1 is installed between the graphite heat exchanger tube 2 and the heat exchanger tube sheet 3 to fill the assembly gap present during the assembly and connection of the graphite heat exchanger tube 2 and the heat exchanger tube sheet 3. The top of the annular plate body 1 is provided with a positioning inner annular plate 4 that abuts against the tube end face of the graphite heat exchanger tube 2 to define its mounting position on the graphite heat exchanger tube 2. The bottom of the annular plate body 1 is provided with a positioning outer annular plate 5 that abuts against the lower surface of the heat exchanger tube sheet 3 to define its relative position to the heat exchanger tube sheet 3. Rigid annular plate sleeves 6, which define the connection configuration between the positioning inner annular plate 4, the positioning outer annular plate 5, and the graphite sleeve 11, are respectively embedded at the upper and lower axial ends of the graphite sleeve 11 of the annular plate body 1. In use, heat exchanger tube sheets 3 need to be installed at both ends of the graphite heat exchanger tube 2, and the heat exchanger tube sheets 3 are further constrained and installed in the outer shell of the heat exchanger. This allows the heat exchanger tube sheets 3 to limit the position of the graphite heat exchanger tube 2 in the outer shell of the heat exchanger. At this time, the heat exchanger tube sheets 3 at both ends of the graphite heat exchanger tube 2 can have a tendency to move towards each other, so that the two heat exchanger tube sheets 3 are attached to the surface of the positioning outer ring plate 5 by pressurization. Thus, the positioning outer ring plate 5 transmits the force through the ring plate body 1, forcing the positioning inner ring plate 4 to pressurize and abut against the end face of the graphite heat exchanger tube 2. Therefore, when the heat exchanger tube sheets 3 are stably constrained and installed in the outer shell of the heat exchanger, the abutment contact between the graphite heat exchanger tube 2 and the positioning inner ring plate 4, and between the heat exchanger tube sheet 3 and the positioning outer ring plate 5 can remain stable. This achieves the stability of the relative position of the graphite heat exchanger tube 2 and the heat exchanger tube sheet 3 and the effective filling of the assembly gap, thereby ensuring the sufficiency and continuous effectiveness of the assembly seal.

[0035] Preferably, a reinforcing wire mesh 12 is embedded on the side surface of the graphite sleeve 11. More preferably, a seepage-proof coating layer 13 is also provided on the side of the reinforcing wire mesh 12 away from the graphite sleeve 11. Specifically, the reinforcing wire mesh 12 can be embedded in an embedding groove opened on the surface of the graphite sleeve 11, or it can be directly wrapped around a part of the surface of the graphite sleeve 11 and embedded in the seepage-proof coating layer 13, so that the graphite sleeve 11 and the seepage-proof coating layer 13 effectively wrap and limit the installation position of the reinforcing wire mesh 12, so as to isolate the reinforcing wire mesh 12 and ensure that the reinforcing wire mesh 12 can suppress the excessive plastic deformation of the graphite sleeve 11 under high pressure conditions. Specifically, the reinforcing wire mesh 12 is limited and isolated by the seepage-proof coating layer 13 wrapped around at least a part of the side surface of the graphite sleeve 11, so as to avoid the reinforcing wire mesh 12 from contacting the medium and being corroded and damaged. Preferably, the graphite sleeve 11, the inner positioning ring plate 4, and the outer positioning ring plate 5 are made of high-density expanded graphite. More preferably, the thickness of the graphite sleeve 11 can be 1-2 mm, and the density ≥ 1.8 g / cm³. 3It directly contacts the outer wall of the graphite heat exchange tube 2, achieving initial filling of the assembly gap. Preferably, the reinforcing wire mesh 12 can be made of Hastelloy C276 or titanium wire mesh with a mesh density of 80-100 mesh, to improve the compressive strength of the graphite matrix represented by the graphite sleeve 11, enabling it to withstand a pressure of ≥15MPa. This allows the metal reinforcing wire mesh 12 to suppress the creep of the graphite sleeve 11 supported by expanded graphite, resulting in a 1000-hour pressure relaxation rate of <5% for the graphite sleeve 11. Preferably, the anti-seepage coating layer 13 can be a modified fluororubber layer containing carbon fiber reinforcement (e.g., carbon fiber fluororubber), with a thickness of 0.5-1mm and a temperature resistance range of approximately -50℃ to 250℃. It can effectively resist media penetration, preventing leakage of highly permeable media and corrosion of the sealing structure.

[0036] Preferably, the inner surface of the graphite sleeve 11 is further provided with an annular protrusion 111 that can fill the gap between it and the outer wall of the graphite heat exchange tube 2 to form a reliable seal, and an inner fitting annular groove 112 for embedding the first annular air bladder 114. Specifically, the first annular air bladder 114 can cooperate with the annular protrusion 111 to achieve a two-stage seal when it expands, thereby improving the sufficiency of the filling barrier and the sealing effect. Specifically, when the graphite sleeve 11 is assembled to the outside of the graphite heat exchange tube 2, the annular protrusion 111 and the outer wall of the graphite heat exchange tube 2 are filled with an interference fit to fully fill the assembly gap. Specifically, the assembly of the annular protrusion 111 and the graphite heat exchange tube 2 can provide an appropriate preload force, causing the graphite sleeve 11 to undergo elastic deformation and form a reliable seal. Preferably, the cross-sectional shape of the annular protrusion 111 can be triangular, semi-circular, or trapezoidal, etc., to facilitate insertion and installation, so as to achieve an interference fit connection. Preferably, an outer mounting groove 113 for embedding the second annular airbag 115 is also provided on the outer surface of the graphite sleeve 11. Specifically, the second annular airbag 115 can be embedded in a position not covered by the reinforcing wire mesh 12 and the anti-seepage coating layer 13. In a preferred embodiment, the reinforcing wire mesh 12 is laid on the groove wall of the outer mounting groove 113 to ensure the compressive strength of the entire graphite sleeve 11, so that the second annular airbag 115 is located between the reinforcing wire mesh 12 and the anti-seepage coating layer 13. The expanding second annular airbag 115 can force the anti-seepage coating layer 13 to deform synchronously and effectively abut against the inner wall of the mounting hole of the heat exchanger tube sheet 3 to fill the assembly gap between the graphite sleeve 11 and the heat exchanger tube sheet 3, thereby achieving the effectiveness and sufficiency of the barrier. Preferably, a gas guiding microtube 116 that can communicate with the first annular airbag 114 and the second annular airbag 115 is also provided on the graphite sleeve 11. Specifically, the graphite sleeve 11 has an insert slot and an insert through slot to facilitate the installation of a gas guide microtube 116 with a branch pipe, so that the gas guide microtube 116 can transport the gas discharged when the expansion bladder 53 is compressed and deformed, and transport this part of the gas to the first annular air bladder 114 and the second annular air bladder 115, so that the first annular air bladder 114 and the second annular air bladder 115 receive the gas and expand to fill the assembly gap.

[0037] Preferably, a first spiral protrusion 41 is provided on the lower surface of the positioning inner ring plate 4 to fully fill the abutment gap between it and the end face of the graphite heat exchange tube 2. More preferably, a first sealing gasket 42 is also provided on the radially inner side of the first spiral protrusion 41. Preferably, the spiral pattern formed by the first spiral protrusion 41 can undergo plastic deformation during abutment to fully fill the micro-defects between the abutment surfaces of the positioning inner ring plate 4 and the end face of the graphite heat exchange tube 2, thereby ensuring the sufficiency and effectiveness of the filling barrier, ensuring sealing performance, and effectively reducing contact stress to improve abutment stability and structural life. Preferably, the first spiral protrusion 41 is made of the same high-density expanded graphite as the positioning inner ring plate 4. Preferably, the first sealing gasket 42 is made of high-temperature resistant and corrosion-resistant silicone rubber or fluororubber, so that the first spiral protrusion 41 and the first sealing gasket 42 have good aging resistance and can effectively extend the service life of the sealing structure.

[0038] Preferably, a second spiral protrusion 51 is provided on the upper surface of the positioning outer ring plate 5 to fully fill the abutment gap between it and the lower surface of the heat exchanger tube sheet 3. More preferably, a second sealing gasket 52 is also provided on the radially outer side of the second spiral protrusion 51. Preferably, an expansion bladder 53 is also embedded on the upper surface of the positioning outer ring plate 5. Specifically, the expansion bladder 53 is connected to the gas guiding microtube 116. More preferably, a lifting arc plate 531 that enables the bladder cavity to be in an expanded state under initial conditions and a return spring 532 that supports the lifting arc plate 531 are provided inside the expansion bladder 53. Preferably, the spiral pattern formed by the second spiral protrusion 51 can undergo plastic deformation during abutment to fully fill the micro-defects between the abutment surfaces of the positioning outer ring plate 5 and the lower surface of the heat exchanger tube sheet 3, thereby ensuring the sufficiency and effectiveness of the filling barrier, ensuring sealing performance, and also effectively reducing contact stress to improve abutment stability and structural life. Preferably, the second spiral protrusion 51 is made of the same high-density expanded graphite as the positioning outer ring plate 5. Preferably, the second sealing gasket 52 is made of high-temperature resistant and corrosion-resistant silicone rubber or fluororubber, so that the second spiral protrusion 51 and the second sealing gasket 52 have good aging resistance and can effectively extend the service life of the sealing structure. Preferably, the return spring 532 can push the lifting arc plate 531 upward when the positioning outer ring plate 5 separates from the heat exchanger tube sheet 3, so that the expansion bladder 53 absorbs air and expands, thereby reducing the gas in the first annular air bladder 114 and the second annular air bladder 115 and releasing the expansion and filling limiting working state of both.

[0039] Preferably, the rigid ring sleeve 6 includes an upper ring sleeve 61 extending radially inward and a lower ring sleeve 62 extending radially outward. Preferably, the surfaces of the upper ring sleeve 61 and the lower ring sleeve 62 are further covered with an adhesive protective layer 63 that can adhere to the graphite sleeve 11, the positioning inner ring plate 4, and / or the positioning outer ring plate 5. Preferably, the adhesive protective layer 63 also uses a modified fluororubber layer containing a carbon fiber reinforcing phase (e.g., carbon fiber fluororubber), with a temperature resistance range of approximately -50℃ to 250℃, which can effectively resist media penetration and prevent strong penetrating media from seeping in and corroding the sealing structure. The upper ring sleeve 61 and the lower ring sleeve 62 provided in this application can improve the connection stability and structural stability of the multi-turn plate-tube combination structure, and ensure the effectiveness of structural contact limiting and filling barrier.

[0040] This utility model is not limited to the above-described optional embodiments. Anyone can derive other various forms of products under the guidance of this utility model. However, regardless of any changes in shape or structure, any technical solution falling within the scope of the claims of this utility model is within the protection scope of this utility model. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and do not constitute a limitation on the claims. The protection scope of this utility model is defined by the claims and their equivalents. Throughout the text, features introduced by "preferred" are merely optional and should not be construed as mandatory. Therefore, the applicant reserves the right to abandon or delete relevant preferred features at any time.

Claims

1. A sealing septum assembly for graphite heat exchanger tubes, comprising an annular plate body (1) capable of being installed between a graphite heat exchanger tube (2) and a heat exchanger tube sheet (3), characterized in that, The top of the ring plate body (1) is provided with a positioning inner ring plate (4) that can abut against the tube end face of the graphite heat exchange tube (2) to limit its fitting position on the graphite heat exchange tube (2), and the bottom of the ring plate body (1) is provided with a positioning outer ring plate (5) that can abut against the lower surface of the heat exchanger tube sheet (3) to limit its relative position with the heat exchanger tube sheet (3). The upper and lower ends of the graphite sleeve (11) of the main body of the ring plate (1) are respectively fitted with rigid ring plate sleeves (6) that can define the connection between the inner positioning ring plate (4), the outer positioning ring plate (5) and the graphite sleeve (11).

2. The sealing septum assembly for graphite heat exchanger tubes as described in claim 1, characterized in that, A reinforcing wire mesh (12) is embedded on the side surface of the graphite sleeve (11), and the reinforcing wire mesh (12) is limited and isolated by an impermeable covering layer (13) wrapped around at least part of the side surface of the graphite sleeve (11).

3. The sealing septum assembly for graphite heat exchanger tubes as described in claim 2, characterized in that, On the inner side of the graphite sleeve (11), there is also an annular protrusion (111) that can fill the gap between it and the outer wall of the graphite heat exchange tube (2) and an inner embedded annular groove (112) for embedding the first annular air bladder (114). An outer fitting annular groove (113) for embedding a second annular airbag (115) is also provided on the outer surface of the graphite sleeve (11).

4. The sealing septum assembly for graphite heat exchanger tubes as described in claim 3, characterized in that, The graphite sleeve (11) is also provided with a gas-guiding microtube (116) that can communicate with the first annular airbag (114) and the second annular airbag (115).

5. The sealing septum assembly for graphite heat exchanger tubes as described in claim 4, characterized in that, at The lower plate surface of the positioning inner ring plate (4) is provided with a first spiral protrusion (41) to fill the abutment gap between it and the end face of the graphite heat exchange tube (2), and a first sealing gasket (42) is also provided on the radial inner side of the first spiral protrusion (41).

6. The sealing septum assembly for graphite heat exchanger tubes as described in claim 5, characterized in that, A second spiral protrusion (51) is provided on the upper plate surface of the positioning outer ring plate (5) to fill the abutment gap between it and the lower plate surface of the heat exchanger tube sheet (3), and a second sealing gasket (52) is also provided on the radial outer side of the second spiral protrusion (51).

7. The sealing septum assembly for graphite heat exchanger tubes as described in claim 6, characterized in that, An expansion bladder (53) is also embedded on the upper surface of the positioning outer ring plate (5), and the expansion bladder (53) is connected to the gas guiding microtube (116).

8. The sealing septum assembly for graphite heat exchanger tubes as described in claim 7, characterized in that, The inflatable bladder (53) is provided with a lifting arc plate (531) that enables the bladder cavity to be in an inflated state under initial conditions, and a return spring (532) that supports the lifting arc plate (531).

9. The sealing septum assembly for graphite heat exchanger tubes as described in claim 8, characterized in that, The rigid ring sleeve (6) includes an upper ring sleeve (61) extending radially inward and a lower ring sleeve (62) extending radially outward.

10. The sealing septum assembly for graphite heat exchanger tubes as described in claim 9, characterized in that, The surfaces of the upper ring sleeve (61) and the lower ring sleeve (62) are also covered with an adhesive protective layer (63) that can adhere to the graphite sleeve (11), the positioning inner ring plate (4) and / or the positioning outer ring plate (5).

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