A self-sealing bushing

Abstract

The application discloses a self-sealing bushing and relates to the technical field of oil pipes. The self-sealing bushing comprises a center pipe which is composed of a tubular body and a diameter expansion part arranged at the middle part of the tubular body and protruding outward of the tubular body; and an intermediate sleeve which is arranged outside the diameter expansion part and is used for blocking heat conduction at the joint of two oil pipes. The intermediate sleeve comprises a carrier which has a plurality of groups of annular spaces, a sealing layer is arranged on the periphery of the annular spaces, a heat insulation layer is arranged on the sealing layer, the sealing layer is made of a thermal expansion material, the carrier is used for limiting axial expansion of the sealing layer and for forming a plurality of turns of the sealing layer. The self-sealing bushing is formed with a plurality of turns of the sealing layer through the carrier, the strength of the sealing layer is improved, axial limiting of expansion of each turn of the sealing layer is realized, and the radial expansion amount of the sealing layer is further improved.

Description

Technical Field

[0001] This invention relates to the field of tubing technology, specifically to a self-sealing bushing. Background Technology

[0002] In existing technologies, high-temperature steam heating is commonly used for heavy oil extraction. However, heat loss occurs during steam transport in insulated oil pipes. Specifically, oil pipes using heating technology suffer significant heat loss due to poor insulation. Furthermore, offshore oil extraction is more challenging than onshore extraction. Therefore, improving the insulation capacity of insulated oil pipes is crucial, as it directly impacts their effective service life.

[0003] One of the main reasons for the shortened effective working time of insulated oil pipes is the significant heat loss at the pipe joints. Although vacuum insulated oil pipes are commonly used in existing technologies, vacuum insulation cannot be achieved at the joints of adjacent oil pipes. Furthermore, the existing insulation structures are inadequate and have high thermal conductivity, resulting in a short effective working time for the insulated oil pipes and increasing production costs.

[0004] To address this issue, a novel heat-insulating bushing was proposed in patent CN210343257U. This bushing solves the problem by setting up a heat-insulating sleeve and a sealing sleeve that expands upon heating (raw graphite, metal wire, asbestos). However, the strength of the expansion material is relatively low, making it prone to damage and breakage. Furthermore, the expansion material in the prior art is prone to axial expansion due to the lack of stratification. Excessive axial expansion can affect the sealing effect. In addition, it only seals the inner circumferential wall of the oil pipe, resulting in a small sealing area and fewer sealing procedures. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a self-sealing bushing, which solves the problems of low strength and easy crushing of the expansion material when using heat insulation sleeves and thermally expanding (raw graphite, metal wire, asbestos) sealing sleeves in existing technologies. Furthermore, the expansion material in existing technologies is prone to axial expansion due to its lack of stratification, and excessive axial expansion can affect the sealing effect. In addition, it only seals the inner circumferential wall of the oil pipe, resulting in a small sealing area and fewer sealing procedures.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a self-sealing bushing, comprising:

[0007] The central tube is composed of a tubular body and an enlarged diameter portion located in the middle of the tubular body and protruding outward from the tubular body.

[0008] An intermediate sleeve, which is fitted outside the enlarged diameter section, is used to block heat conduction at the junction of the two oil pipes.

[0009] The intermediate sleeve comprises a carrier, the carrier has a plurality of sets of spaced annular spaces, the annular spaces are provided with a sealing layer on the periphery, the sealing layer is provided with a heat insulation layer, the sealing layer is made of a thermal expansion material, the carrier is used to limit the axial expansion of the sealing layer, and a plurality of turns of sealing are formed;

[0010] The butt joint ends of the oil pipe two and the oil pipe one are provided with centripetal bent blocking rings, the sealing layer is close to the annular space, and the sealing layer in the middle is provided with a notch matched with the blocking ring;

[0011] One side of the carrier close to the blocking ring is provided with a pressure-deformable structure, the pressure-deformable structure can be pressed on the blocking ring when the sealing layer expands, and a radial face sealing state of the oil pipe two and the oil pipe one is formed.

[0012] Further, the sealing layer is a molded graphite packing or a molded composite ceramic fiber.

[0013] Further, the carrier comprises:

[0014] A barrel frame, the barrel frame is provided with end frames at both ends;

[0015] The ring frames are provided with two sets of ring frames, and the two sets of ring frames are arranged in regions close to both ends of the barrel frame, the two sets of ring frames divide the space on the barrel frame into three parts, the heat insulation layer is arranged on one side close to the barrel frame, and the sealing layer is arranged on one side away from the barrel frame, and the barrel frame, the ring frame and the end frame are all rigid structures and are used to limit the axial expansion of the sealing layer.

[0016] Further, the notch is located at the periphery of both sides of the sealing layer between the two ring frames, and the blocking ring is located in the notch.

[0017] The pressure-deformable structure comprises:

[0018] The periphery of the ring frame is provided with a conical surface, and the periphery of the conical surface is provided with a wedge-shaped ring; the radial expansion of the sealing layer is used to seal the circumferential inner wall of the oil pipe two and the oil pipe one, and the expansion of the sealing layer is also used to press the wedge-shaped ring, so that the wedge-shaped ring synchronously seals the circumferential and radial directions of the oil pipe two and the oil pipe one.

[0019] Further, a compensation ring is further arranged between the butt joint ends of the oil pipe two and the oil pipe one.

[0020] Further, the carrier comprises:

[0021] A wave-shaped frame, the heat insulation layer is filled in a wave cavity of the wave-shaped frame, the wave cavity divides the sealing layer into a plurality of parallel layers, so that the sealing layer can expand in multiple turns along the axial direction of the oil pipe; the wave-shaped frame is provided with end frames at both ends;

[0022] The end frames are used to limit the axial expansion of the sealing layer.

[0023] Further, the wave in the middle is an elastic ring structure, the cross section of the elastic ring structure is U-shaped, the elastic ring structure forms a pressure deformable structure, a notch is arranged on the heat insulation layer in the U-shaped cavity, and the blocking ring is located in the notch.

[0024] Further, the end sleeve is sleeved on the tubular body and located at two ends of the diameter expansion part, the two ends of the middle sleeve abut against the end faces of the end sleeves, and the end sleeve comprises a metal framework and a thermal expansion sealing layer which is molded on the metal framework and wraps the metal framework.

[0025] Further, the metal framework has a hollow area, and the thermal expansion sealing layer is filled in the metal framework.

[0026] Further, one end of the metal framework close to the thermal expansion sealing layer has a threaded ring, and the end face of the end frame is provided with a threaded groove matched with the threaded ring.

[0027] The present application has the following advantages:

[0028] (1) The self-sealing sleeve forms multiple rings of the sealing layer through the carrier, improves the strength of the sealing layer, limits the axial expansion of each ring of the sealing layer, further improves the radial expansion amount, and since the metal ring between two rings of the sealing layer does not expand radially after the expansion of the sealing layer, the two adjacent rings of the sealing layer are not in contact, thereby forming multiple seals, and once the front seal fails to seal oil, the rear seal can continue to seal.

[0029] (2) The self-sealing sleeve is provided with a pressure deformable structure, and a blocking ring matched with the pressure deformable structure is arranged on the oil pipe, so that the pressure deformable structure changes after the expansion of the sealing layer, which can seal the inner wall of the oil pipe and press on the blocking ring to increase a seal at the end of the oil pipe, thereby improving the sealing effect.

[0030] Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a perspective view of the present application;

[0032] Figure 2 is a structural schematic view of the central pipe of the present application;

[0033] Figure 3 is a structural schematic view of the internal structure of the first embodiment of the present application;

[0034] Figure 4 is a structural schematic view of the carrier in the first embodiment of the present application;

[0035] Figure 5 Assembling view of the oil pipe and the oil pipe sleeve in the embodiment of the present application;

[0036] Figure 6 Assembling view of the oil pipe and the oil pipe sleeve in the embodiment of the present application; Figure 5 Perspective view of the present application;

[0037] Figure 7 Enlarged view of the A area of the present application; Figure 6

[0038] Figure 8 Exploded view of the present application; Figure 4

[0039] Sectional view of the present application; Figure 9 Figure 4 Structure schematic view of the end sleeve of the present application;

[0040] Figure 10 Exploded view of the present application;

[0041] Figure 11 Structure schematic view of the metal frame of the present application adopting rectangular hollow area; Figure 10

[0042] Structure schematic view of the metal frame of the present application adopting rectangular hollow area; Figure 12

[0043] Internal structure schematic view of the embodiment two of the present application; Figure 13

[0044] Assembling view of the oil pipe and the oil pipe sleeve in the embodiment two of the present application. Figure 14 In the figure, 100, central pipe; 110, tubular body; 120, diameter expansion part; 200, end sleeve; 210, heat expansion sealing layer; 220, metal framework; 221, threaded ring; 222, hollow area; 300, intermediate sleeve; 310, carrier frame; 311, cylinder frame; 312, ring frame; 313, wedge-shaped ring; 314, end frame; 315, wave-shaped frame; 320, heat insulation layer; 330, sealing layer; 340, notch; 400, oil pipe two; 500, sleeve coupling; 600, oil pipe one; 700, compensation ring; 800, stop ring.

[0045] DETAILED DESCRIPTION The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0047] ​​In the description of the present application, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery" and the like indicate the orientation or positional relationship, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0048] The following is based on Figures 1-14 The self-sealing liner provided by the embodiment of the present application is described.

[0049] Embodiment one: please refer to Figures 1-3 The self-sealing liner provided by the embodiment of the present application is described.

[0050] As Figure 2 The center pipe 100 is composed of a tubular body 110 and an expanded diameter portion 120 provided at the middle part of the tubular body 110 and protruding outwardly from the tubular body 110, and the cross section of the expanded diameter portion 120 along the axis of the tubular body 110 is trapezoidal.

[0051] The end sleeve 200 is provided on the tubular body 110 and located at both ends of the expanded diameter portion 120, and is symmetrically arranged on both sides of the expanded diameter portion 120, preferably, the end sleeve 200 has a gap between the expanded diameter portion 120.

[0052] The intermediate sleeve 300 is provided outside the expanded diameter portion 120, preferably, the two are in interference fit, the axial length of the inner wall of the intermediate sleeve 300 is greater than or equal to the axial length of the outer wall of the tubular body 110, the intermediate sleeve 300 is used to block the heat conduction at the joint of the two oil pipes, and the two ends of the intermediate sleeve 300 abut against the end faces of the end sleeve 200 to avoid the occurrence of a sealing section.

[0053] Referring to Figure 4 The outer annular surface of the self-sealing liner provided by the embodiment of the present application is in contact with the inner walls of the oil pipe one 600 and the oil pipe two 400, and the pressure generated by the center pipe 100, the end faces of the two groups of oil pipe male and female threads and the inner wall of the casing coupling 500 on the self-sealing liner forms a self-sealing structure, after self-sealing, the intermediate sleeve 300 located in the center area of the butt joint of the two groups of oil pipes can maximize the isolation of internal and external heat, and maximize the solution of the oil pipe coupling sealing and heat insulation problem, in addition, since the center pipe 100 in the present application directly isolates a large amount of oil from direct contact with the end sleeve 200 and the intermediate sleeve 300, the problem of falling of graphite sheet after long time sealing in the prior art will not occur.

[0054] Preferably, the intermediate sleeve 300 comprises a carrier 310, the carrier 310 has a plurality of sets of spaced annular spaces, the annular spaces are provided with a sealing layer 330 on the periphery, the sealing layer 330 is provided with a heat insulation layer 320, and the sealing layer 330 is made of a thermal expansion material.

[0055] Therefore, the carrier 310 provided by the embodiment of the present application is used to limit the axial expansion of the sealing layer 330, further improve the radial expansion amount thereof, and can be used to form a plurality of turns of sealing. In addition, since the metal ring between the two turns of the sealing layer 330 does not expand radially after the expansion of the sealing layer 330, the two turns of the sealing layer 330 are substantially not in contact, so that a plurality of sections of sealing are formed, and once the oil absorption of the front section of sealing fails, the rear section of sealing can continue to seal.

[0056] In addition, in order to expand the sealing area, the abutted end of the oil pipe two 400 and the oil pipe one 600 are provided with a centripetal bent stop ring 800, the sealing layer 330 is close to the annular space, and the sealing layer 330 in the middle is provided with a notch 340 matched with the stop ring 800. One side of the carrier 310 close to the stop ring 800 is provided with a pressure-deformable structure, which can be pressed on the stop ring 800 when the sealing layer 330 expands, so as to form a radial surface sealing state of the oil pipe two 400 and the oil pipe one 600.

[0057] In the embodiment, the stop ring 800 matched with the pressure-deformable structure is arranged on the oil pipe two 400 and the oil pipe one 600, so that the pressure-deformable structure can be changed after the expansion of the sealing layer 330. The change can seal the inner wall of the oil pipe on one hand, and can press on the stop ring on the other hand, so as to increase a sealing of the oil pipe end and strengthen the sealing effect.

[0058] In combination Figures 3-9 As shown, specifically, the carrier 310 in the embodiment comprises a barrel carrier 311 and a ring carrier 312. The barrel carrier 311 has end carriers 314 at both ends. The ring carrier 312 is provided with two sets, and the two sets of ring carriers 312 are arranged in regions close to both ends of the barrel carrier 311. The two sets of ring carriers 312 divide the space on the barrel carrier 311 into three parts. The heat insulation layer 320 is arranged on one side close to the barrel carrier 311, and the sealing layer 330 is arranged on the side away from the barrel carrier 311. The barrel carrier 311, the ring carrier 312 and the end carrier 314 are all rigid structures, which are used to limit the axial expansion of the sealing layer 330.

[0059] In addition, the notch 340 is located on the periphery of both sides of the sealing layer 330 between the two ring carriers 312, and the stop ring 800 is located in the notch 340. The pressure-deformable structure comprises a tapered surface on the periphery of the ring carrier 312, and a wedge-shaped ring 313 on the periphery of the tapered surface.

[0060] Thus, the sealing layer 330 expands radially to seal the circumferential inner wall of the oil pipe two 400 and the oil pipe one 600, and the expansion of the sealing layer 330 also serves to press the wedge-shaped ring 313, so that the wedge-shaped ring 313 is pressed to move, and the movement synchronously seals the circumferential and radial direction of the oil pipe two 400 and the oil pipe one 600.

[0061] Preferably, in order to fill the gap between the oil pipe two 400 and the oil pipe one 600, a compensation ring 700 is also arranged between the abutting ends of the oil pipe two 400 and the oil pipe one 600, and the compensation ring 700 is preferably a high-temperature-resistant metal ring.

[0062] In this embodiment, the carrier 310 is made of a metal that does not deform under heat, such as a titanium-based composite material with added ceramic particles.

[0063] The heat insulation layer 320 is preferably made of aerogel material.

[0064] The sealing layer 330 is made of a thermal expansion material, and the thermal expansion material of the sealing layer 330 is a molded graphite packing or a molded composite ceramic fiber.

[0065] The manufacturing steps of the molded graphite packing are as follows:

[0066] Step one, mix chopped graphite fibers with a binder such as phenolic resin;

[0067] Step two, place the carrier 310 carrying the heat insulation layer 320 into a mold, and use the mixture of chopped graphite fibers and the binder such as phenolic resin to feed the space between the carrier 310 and the mold, and cold-press the pre-form under a pressure of 20-50 MPa;

[0068] Step three, high-temperature carbonization (700-800°C) to remove the binder and form a porous structure.

[0069] Step four, secondary impregnation (such as pitch) to increase the density.

[0070] The end sleeve 200 mentioned above includes a metal framework 220 and a thermal expansion sealing layer 210 molded on and wrapped around the metal framework 220, and the metal framework 220 has the same material as the carrier 310 in this embodiment, which is used to carry the thermal expansion sealing layer 210 and improve the strength of the thermal expansion sealing layer 210.

[0071] Optionally, the thermal expansion sealing layer 210 is made of a thermal expansion material, and the thermal expansion material is a molded graphite packing or a nickel wire graphite fiber woven body.

[0072] In combination Figures 10-12As shown, further, in order to improve the connection performance of the peripheral thermal expansion sealing layer 210 in the metal framework 220 (i.e. the integrity and stability of the two layers of thermal expansion sealing layer 210), the metal framework 220 has a hollow area 222, and the metal framework 220 is filled with the thermal expansion sealing layer 210, so that the peripheral thermal expansion sealing layer 210 is essentially a one-piece structure.

[0073] The hollow area 222 is a circular through hole or a rectangular hole.

[0074] Preferably, the metal framework 220 has a threaded ring 221 at one end close to the thermal expansion sealing layer 210, and the end face of the end bracket 314 is provided with a threaded groove matched with the threaded ring 221, facilitating the connection of the two.

[0075] Embodiment two: please refer to Figures 13-14 As shown, the difference between this embodiment and embodiment one is that the carrier 310 includes a wave-shaped bracket 315, and the thermal insulation layer 320 is filled in the wave cavity of the wave-shaped bracket 315, and the wave cavity divides the sealing layer 330 into multiple layers arranged side by side, which enables the sealing layer 330 to form multiple turns of expansion along the oil pipe axis; the wave-shaped bracket 315 has end brackets 314 at both ends; the end brackets 314 are used to limit the axial expansion of the sealing layer 330.

[0076] Therefore, in the embodiments of the present application, the purpose of limiting axial expansion and multiple turns of sealing can also be achieved.

[0077] Preferably, the middlemost wave is an annular structure with elasticity, the cross section of the annular structure with elasticity is U-shaped, the annular structure with elasticity forms a pressure-deformable structure, the thermal insulation layer 320 in the U-shaped cavity is provided with a notch 340, and the retaining ring 800 is located in the notch 340, so that when the sealing layer 330 on both sides of the middlemost wave expands, it can extrude the U-shaped structure to deform, and the U-shaped structure is pressed on the retaining ring 800 to realize radial sealing, increase a sealing procedure, and expand the sealing area.

[0078] For the carrier 310: the middlemost wave is made of a metal material capable of deforming, such as spring steel or stainless steel, and the remaining part is made of a metal ring that does not deform under heat, and the two can be connected by welding.

[0079] Since the carrier 310, except for the middlemost wave, the remaining waves will not deform and are blocked by the end sleeve 200, the sealing layer 330 can form multiple turns of expansion in the radial direction in the cavities of the wave peaks and valleys, and the multiple turns of expansion sites can enable the inner and outer turns of the sealing layer 330 to form multiple turns of sealing.

[0080] Preferably, the thermal insulation layer 320 is made of aerogel thermal insulation material, which has strong high-temperature resistance and pressure resistance.

[0081] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other presenters can develop. It is also possible, however, that only a single element can be present. It is further noted that such a term as "comprising" is intended to mean that the embodiments include the recited elements, but not excluding other elements. "Consisting essentially of when used herein in relation to a composition, means that the composition includes the recited elements, and can include additional elements, so long as the additional elements do not materially alter the basic and novel characteristics of the claimed composition. "Consisting of" when used herein in relation to a composition, means that the composition includes the recited elements, and no additional elements.

[0082] The preferred embodiments of the application disclosed above are only to help explain the principles of the present application. The preferred embodiments do not describe all the details of the present application, nor limit the present application to only the specific embodiments described. It is apparent that many modifications and variations can be made to the present application based on the content of the present disclosure. The present disclosure selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application. The present application is limited only by the claims and their full scope and equivalents.

Claims

1. A self-sealing bushing characterized by, The utility model relates to a centering device for oil pipe connection, comprising: a centering pipe (100) composed of a tubular body (110) and a diameter expansion part (120) arranged at the middle part of the tubular body (110) and protruding outward from the tubular body (110); a middle sleeve (300) sleeved outside the diameter expansion part (120) for blocking heat conduction at the connection part of two oil pipes; the middle sleeve (300) comprises a carrier (310) having a plurality of groups of spaced annular spaces, a sealing layer (330) arranged at the periphery of the annular spaces, and a heat insulation layer (320) arranged on the sealing layer (330), the sealing layer (330) is made of a thermal expansion material, the carrier (310) is used for limiting axial expansion of the sealing layer (330) and forming a plurality of turns of sealing; the abutment end of the second oil pipe (400) and the first oil pipe (600) is provided with a centripetal bent blocking ring (800), the sealing layer (330) is close to the annular space, and the middle sealing layer (330) is provided with a notch (340) matched with the blocking ring (800); one side of the carrier (310) close to the blocking ring (800) is provided with a pressure-deformable structure, which can be pressed on the blocking ring (800) when the sealing layer (330) expands, so as to form a radial face sealing state of the second oil pipe (400) and the first oil pipe (600).

2. A self sealing liner sleeve according to claim 1, wherein, The sealing layer (330) is a molded graphite packing or a molded composite ceramic fiber.

3. A self sealing liner sleeve according to claim 1, wherein, The carrier (310) comprises: a cylinder carrier (311) having end carriers (314) at both ends; two ring carriers (312) are arranged at the regions close to both ends of the cylinder carrier (311), the two ring carriers (312) divide the space on the cylinder carrier (311) into three parts, the heat insulation layer (320) is arranged on one side close to the cylinder carrier (311), and the sealing layer (330) is arranged on the side away from the cylinder carrier (311), the cylinder carrier (311), the ring carrier (312), and the end carrier (314) are all rigid structures for limiting axial expansion of the sealing layer (330).

4. A self sealing liner sleeve according to claim 3, wherein, The notch (340) is located at the periphery of the sealing layer (330) on both sides between the two ring carriers (312), and the blocking ring (800) is located in the notch (340); the pressure-deformable structure comprises: a tapered surface is arranged at the periphery of the ring carrier (312), and a wedge-shaped ring (313) is arranged at the periphery of the tapered surface; the sealing layer (330) expands radially to seal the circumferential inner wall of the second oil pipe (400) and the first oil pipe (600), and the sealing layer (330) also expands to press the wedge-shaped ring (313), so that the wedge-shaped ring (313) synchronously seals the circumferential direction and the radial direction of the second oil pipe (400) and the first oil pipe (600).

5. A self sealing liner sleeve according to claim 4, wherein, A compensation ring (700) is further arranged between the abutment ends of the second oil pipe (400) and the first oil pipe (600).

6. A self sealing liner sleeve according to claim 1, wherein: the carrier (310) comprises: The wave-shaped frame (315) is filled with the heat insulation layer (320) in the wave cavity of the wave-shaped frame (315), and the wave cavity divides the sealing layer (330) into multiple layers in parallel, so that the sealing layer (330) can form multiple turns of expansion along the oil pipe axis; the wave-shaped frame (315) has end frames (314) at both ends; The end frames (314) are used to limit the axial expansion of the sealing layer (330).

7. A self sealing liner sleeve according to claim 6, characterised in that: The middle one of the waves is an elastic annular structure, the cross section of the elastic annular structure is U-shaped, the elastic annular structure forms a pressure-deformable structure, and the heat insulation layer (320) in the U-shaped cavity is provided with a notch (340), and the blocking ring (800) is located in the notch (340).

8. A self sealing bush according to any one of claims 2 to 6 wherein: Further comprising end sleeves (200), the end sleeves (200) are sleeved on the tubular body (110) and located at both ends of the expanded diameter portion (120), the middle sleeves (300) abut against the end faces of the end sleeves (200), and the end sleeves (200) comprise metal skeletons (220) and heat expansion sealing layers (210) which are molded on the metal skeletons (220) and wrap the metal skeletons (220).

9. A self sealing liner sleeve according to claim 8, characterised in that: The metal skeleton (220) has a hollow area (222) thereon, and the metal skeleton (220) is filled with the heat expansion sealing layer (210).

10. A self sealing liner sleeve according to claim 9, characterised in that: The end of the metal skeleton (220) close to the heat expansion sealing layer (210) has a threaded ring (221), and the end face of the end frame (314) is provided with a threaded groove matched with the threaded ring (221).

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