Flat cover heating coil connecting structure of high-pressure quick-opening door equipment

Abstract

The invention relates to the field of connecting pieces, and discloses a flat cover heating coil connecting structure of high-pressure quick-opening door equipment, the structure comprises a heating coil, a leading-out sleeve and a locking nut, the leading-out sleeve axially penetrates along a through hole of a flat cover, and the leading-out sleeve and the locking nut form a thread locking structure through an external thread to realize fixation; a hard sealing displacement compensation structure is arranged on the inner side of the leading-out sleeve and comprises an elastic metal integrally-formed spherical sealing ring, the heating coil and the leading-out sleeve are connected in a sealed mode through argon arc welding, and the heating coil and the leading-out sleeve are sleeved with a weld joint protection sleeve. Metal-to-metal initial hard sealing and self-tightening type secondary sealing can be formed, high pressure larger than or equal to 10 MPa can be resisted, and infinitesimal displacement can be compensated during temperature fluctuation; the lead-out sleeve is adaptive to the pipe diameter of DN15-DN100, does not need to be cut and welded during disassembly and assembly, is convenient to maintain, is suitable for medium scenes of heat conduction oil, steam, hot water and the like, and effectively improves the running safety, stability and economical efficiency of equipment.

Description

Technical Field

[0001] This invention relates to the field of connectors, and more particularly to a connection structure for a flat cover heating coil of a high-pressure quick-opening door device. Background Technology

[0002] High-pressure quick-opening valve equipment is widely used in chemical, pharmaceutical and other fields. Its flat cover often requires openings to connect to external pipelines (such as heating coils). In traditional structures, the openings of the flat cover are mostly connected by direct welding, flanges, or by welding thick-walled pipes extending inward or outward to the pipeline. With the rapid development of technology, working conditions are becoming increasingly harsh and complex, with high pressure and high temperature, and the requirements for equipment are becoming more and more demanding. The metal materials of traditional connection gaskets are softer than flanges. The bolt preload force forcibly squeezes the gasket into plastic deformation. Under the action of external force and internal pipeline pressure, the gasket is subjected to uneven force 360 ​​degrees. When an effective sealing pressure imbalance occurs, media leakage and accidents are likely to occur.

[0003] Existing technological defects and shortcomings: 1. Poor sealing performance: Direct welding or threaded connections are prone to leakage under high pressure, affecting equipment safety; 2. Insufficient pressure resistance: Traditional sealing structures are prone to fatigue failure under high-pressure cyclic loads; 3. High maintenance costs: Replacing the heating coil requires cutting or re-welding, which is time-consuming and costly. 4. Stress concentration: Stress concentration occurs at the weld due to structural discontinuity and temperature changes, which accelerates structural fatigue.

[0004] In summary, a high-pressure resistant, reliably sealed, and easy-to-disassemble and maintain structure has been developed, which is suitable for connecting high-pressure quick-opening door equipment with heating coils. Summary of the Invention

[0005] To address the technical problems of poor sealing performance, insufficient pressure resistance, high maintenance costs, and stress concentration, this invention provides a flat cover heating coil connection structure for high-pressure quick-opening door equipment.

[0006] This invention employs the following technical solution: a heating coil connection structure for a flat cover of a high-pressure quick-opening door device, comprising a heating coil, a lead-out sleeve, and a locking nut; a through hole is provided on the flat cover of the high-pressure quick-opening door device, and the lead-out sleeve axially penetrates the flat cover along the through hole; an external thread is provided on the outer side of the lead-out sleeve, and the locking nut cooperates with the external thread to form a threaded locking structure, thereby fixing the lead-out sleeve to the flat cover by tightening the locking nut; a hard-seal displacement compensation structure is provided on the inner side of the lead-out sleeve, and the spherical sealing ring of the hard-seal displacement compensation structure is integrally formed from an elastic metal material. The hard-seal displacement compensation structure includes a spherical sealing ring, and the wall of the through hole of the flat cover is provided with a sealing cone surface, the sealing surface angle of the sealing cone surface is α, and the mating surface angle of the lead-out sleeve corresponding to the sealing cone surface is β, and α > β; the inlet and outlet ends of the heating coil pass through the inner hole of the lead-out sleeve, and the heating coil is sealed and welded to the inner wall of the lead-out sleeve.

[0007] As a further optimization of the present invention, the connection structure is suitable for heating coil connection scenarios corresponding to heat transfer oil, steam or hot water media.

[0008] As a further optimization of the present invention, a through hole is first opened on the flat cover, and the lead-out sleeve passes through the flat cover axially along the through hole; the inlet and outlet ends of the heating coil pass through the inner hole of the lead-out sleeve, and the heating coil and the inner wall of the lead-out sleeve are sealed by argon arc welding, and a weld protection sleeve is fitted on the outside of the weld to protect the weld; an external thread is provided on the outside of the lead-out sleeve, and the locking nut and the external thread cooperate to form a thread locking structure with fine thread; a metal flat washer is installed between the contact surface of the locking nut and the flat cover; tightening the locking nut can fix the lead-out sleeve and the flat cover; at the same time, the outer peripheral wall of the locking nut is provided with an anti-loosening groove, and an anti-loosening pin or anti-loosening washer is placed in the anti-loosening groove to prevent the locking nut from loosening during operation.

[0009] As a further optimization of the present invention, when the heating coil needs to be replaced, there is no need to cut or re-weld. Simply remove the anti-loosening pin or anti-loosening washer in the anti-loosening groove, loosen the locking nut, and the lead-out sleeve and the heating coil can be taken out together from the through hole of the flat cover, realizing the quick replacement of the heating coil. After that, it can be reassembled according to the installation and fixing process, which greatly shortens the maintenance period and reduces the maintenance cost.

[0010] As a further optimization of the present invention, the threaded locking structure has fine threads, and a metal flat washer is provided between the mating surfaces of the locking nut and the flat cover.

[0011] As a further optimization of the present invention, the inner diameter of the lead-out sleeve is adjustable, and the diameter range of the heating coil is DN15-DN100.

[0012] As a further optimization of the present invention, the sealing weld connection between the heating coil and the lead-out sleeve is argon arc welding, and a weld protection sleeve is fitted on the outside of the weld.

[0013] As a further optimization of the present invention, the outer peripheral wall of the locking nut is provided with an anti-loosening groove, and an anti-loosening pin or an anti-loosening washer is disposed in the anti-loosening groove.

[0014] As a further optimization of the present invention, the outer surface of the lead-out sleeve is coated with an anti-corrosion coating, which is either a polytetrafluoroethylene (PTFE) coating or a ceramic coating. This anti-corrosion coating (PTFE or ceramic coating) prevents the lead-out sleeve from corroding during operation. When the internal temperature of the device system fluctuates, the locking nut, flat cap, and lead-out sleeve will experience slight displacement changes due to temperature differences and different coefficients of linear expansion. The spherical sealing ring of the hard-seal displacement compensation structure compensates for these slight displacements through elastic deformation, relying on the properties of its own elastic metal material, thus avoiding stress imbalance on the sealing surface and ensuring continuous sealing performance. Simultaneously, the inner diameter of the lead-out sleeve is adjustable, adapting to heating coils with diameters ranging from DN15 to DN100, improving structural compatibility.

[0015] As a further optimization of the present invention, the value of α ranges from 105° to 135°, and the value of β ranges from 104° to 134°. The inner side of the lead-out sleeve is provided with a hard-seal displacement compensation structure. This structure includes a spherical sealing ring integrally formed from an elastic metal material. The through-hole wall of the flat cover is provided with a sealing cone surface. The sealing surface angle of the sealing cone surface is α (range 105°-135°), and the mating surface angle of the lead-out sleeve corresponding to the sealing cone surface is β (range 104°-134°), where α > β. Tightening the locking nut until the sealing surface of the lead-out sleeve yields causes the installation gap between the lead-out sleeve and the sealing surface of the flat cover to approach 0. The sealing cone surface of the through-hole of the flat cover compresses the spherical sealing ring of the lead-out sleeve, causing the spherical sealing ring to shrink and deform, forming an initial hard seal between metal and metal. Furthermore, the spherical sealing ring is uniformly stressed in the 360-degree direction, ensuring the stability of the initial seal.

[0016] As a further optimization of the present invention, when the internal pressure P of the system is loaded, increased or fluctuates, the spherical sealing ring of the hard seal displacement compensation structure will expand or contract outward with the change of internal pressure, and generate elastic deformation based on spring theory to form a self-tightening secondary seal; the internal pressure P of the system is proportional to the effective contact pressure between the sealing cone surface and the spherical sealing ring. The higher the internal pressure, the greater the clamping force of the spherical sealing ring, and the better the sealing performance. It can withstand high pressure of ≥10MPa, avoid medium leakage, and is suitable for heating coil connection scenarios of media such as heat transfer oil, steam or hot water.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention significantly improves sealing reliability through an innovative hard-seal displacement compensation structure. The spherical sealing ring is integrally molded from elastic metal material, and with the angle design (α > β) between the flat cap sealing cone surface and the lead-out sleeve mating surface, an initial metal-to-metal hard seal is formed after tightening the locking nut. Furthermore, the spherical sealing ring experiences uniform force across 360 degrees, preventing pressure imbalance. When the system pressure is loaded or fluctuates, the spherical sealing ring undergoes elastic deformation based on spring theory, forming a self-tightening secondary seal. The higher the internal pressure, the greater the tightening force, and it can stably withstand pressures ≥10MPa. Simultaneously, the spherical sealing ring effectively compensates for minor displacements caused by temperature fluctuations through elastic deformation, preventing force imbalance on the sealing surface and completely solving the leakage problem of traditional connection structures under high pressure and variable temperature conditions, ensuring equipment operational safety.

[0018] 2. This invention addresses the shortcomings of traditional structures, such as insufficient compressive strength and susceptibility to fatigue failure, by optimizing the overall structural design. The threaded locking structure utilizes fine-pitch threads and a metal flat washer to enhance connection tightness and distribute load transmission. The heating coil and the lead-out sleeve are sealed together by argon arc welding, with a weld protection sleeve on the outside to reduce structural discontinuities at the weld and lower the risk of stress concentration. The outer surface of the lead-out sleeve is coated with a polytetrafluoroethylene or ceramic anti-corrosion coating, improving corrosion resistance and reducing environmental erosion. The hard-seal structure effectively absorbs the impact of high-pressure cyclic loads, while the elastic metal spherical sealing ring buffers stress, preventing accelerated aging due to fatigue and significantly extending the service life of the connection structure, thus meeting the demanding and complex requirements of high-pressure operating conditions.

[0019] 3. This invention eliminates the traditional disassembly and assembly methods that require cutting and re-welding of the connection structure. It adopts a threaded locking and anti-loosening design, significantly simplifying the maintenance process. When the heating coil needs to be replaced, simply remove the anti-loosening pin or anti-loosening washer from the anti-loosening groove of the locking nut, loosen the locking nut, and the lead-out sleeve and heating coil can be taken out together from the through hole of the flat cover without damaging the original connection structure. Reassembly can be completed by following the installation procedure, greatly shortening the maintenance period and reducing downtime. This convenient disassembly and assembly method avoids the complex processes of welding and cutting in traditional maintenance, reducing labor costs and material waste, solving the pain points of high maintenance costs and long construction periods of traditional structures, and improving the economic efficiency of equipment use.

[0020] 4. This invention possesses excellent structural compatibility and scenario adaptability. The inner diameter of the lead-out sleeve is flexibly adjustable, adapting to heating coils of different diameters within the DN15-DN100 range. This eliminates the need for separately designed connection structures for specific pipe diameters, enhancing the structure's versatility. Furthermore, this connection structure is adaptable to heating coil connection scenarios involving various media such as heat transfer oil, steam, and hot water, meeting the diverse usage needs of high-pressure quick-opening equipment in fields such as chemical and pharmaceutical industries. The anti-corrosion coating design further expands its application possibilities under corrosive conditions. Regardless of different pipe diameter requirements, media, or environmental conditions, it can stably perform its connection and sealing function, enhancing the product's practical value and market applicability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure after the invention is installed; Figure 3 This is a schematic diagram of the lead-out sleeve structure of the core component of this invention; Figure 4 This is a schematic diagram from the α-angle of the present invention.

[0022] Explanation of key symbols: 1. Heating coil; 2. Lead-out sleeve; 3. Locking nut. Detailed Implementation

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0024] Example 1: Please combine Figures 1-4 This embodiment proposes a connection structure for the heating coil 1 of the flat cover of a high-pressure quick-opening door device. The structure includes a heating coil 1, a lead-out sleeve 2, and a locking nut 3. A through hole is provided on the flat cover of the high-pressure quick-opening door device, and the lead-out sleeve 2 penetrates the flat cover axially along the through hole. An external thread is provided on the outer side of the lead-out sleeve 2, and the locking nut 3 engages with the external thread to form a threaded locking structure. Tightening the locking nut 3 secures the lead-out sleeve 2 to the flat cover. The inner side of the lead-out sleeve 2 is provided with a hard-seal displacement compensation structure, which includes a spherical sealing ring. The through hole wall of the flat cover is provided with a sealing cone surface. The sealing surface angle of the sealing cone surface is α, and the mating surface angle of the lead-out sleeve 2 corresponding to the sealing cone surface is β, and α > β. The inlet and outlet ends of the heating coil 1 pass through the inner hole of the lead-out sleeve 2, and the heating coil 1 is sealed and welded to the inner wall of the lead-out sleeve 2.

[0025] It should be noted that the connection structure is suitable for connection scenarios of heating coil 1 corresponding to heat transfer oil, steam or hot water media.

[0026] The specific technical solution involves first opening a through hole in the flat cover, through which the lead-out sleeve 2 passes axially. The inlet and outlet ends of the heating coil 1 pass through the inner hole of the lead-out sleeve 2, and the heating coil 1 and the inner wall of the lead-out sleeve 2 are sealed by argon arc welding. A weld protection sleeve is fitted on the outside of the weld to protect the weld. An external thread is provided on the outside of the lead-out sleeve 2, and the locking nut 3 cooperates with the external thread to form a fine-pitch thread locking structure. A metal flat washer is installed between the contact surface of the locking nut 3 and the flat cover. Tightening the locking nut 3 can fix the lead-out sleeve 2 to the flat cover. At the same time, the outer peripheral wall of the locking nut 3 is provided with an anti-loosening groove, and an anti-loosening pin or anti-loosening washer is placed in the anti-loosening groove to prevent the locking nut 3 from loosening during operation.

[0027] Furthermore, when the heating coil 1 needs to be replaced, there is no need to cut or re-weld. Simply remove the anti-loosening pin or anti-loosening washer in the anti-loosening groove, loosen the locking nut 3, and the lead-out sleeve 2 and the heating coil 1 can be taken out together from the through hole of the flat cover, realizing the quick replacement of the heating coil 1. After that, it can be reassembled according to the installation and fixing process, which greatly shortens the maintenance period and reduces maintenance costs.

[0028] The spherical sealing ring of the hard-seal displacement compensation structure is made of elastic metal material in one piece.

[0029] The threaded locking structure has fine threads, and a metal flat washer is provided between the mating surface of the locking nut 3 and the flat cover.

[0030] The inner diameter of the lead-out sleeve 2 is adjustable, and the diameter range of the heating coil 1 is DN15-DN100.

[0031] The sealing weld connection between the heating coil 1 and the lead-out sleeve 2 is argon arc welding, and a weld protection sleeve is fitted on the outside of the weld.

[0032] It should be noted that the outer peripheral wall of the locking nut 3 is provided with an anti-loosening groove, and an anti-loosening pin or anti-loosening washer is provided in the anti-loosening groove.

[0033] Specifically, the outer surface of the lead-out sleeve 2 is coated with an anti-corrosion coating, which is either a polytetrafluoroethylene (PTFE) coating or a ceramic coating. This anti-corrosion coating prevents corrosion of the lead-out sleeve 2 during operation. When the internal temperature of the device system fluctuates, the locking nut 3, the flat cover, and the lead-out sleeve 2 will experience slight displacement changes due to temperature differences and different coefficients of linear expansion. The spherical sealing ring of the hard-seal displacement compensation structure compensates for these slight displacements through elastic deformation, relying on the properties of its own elastic metal material, thus avoiding stress imbalance on the sealing surface and ensuring continuous sealing performance. Simultaneously, the inner diameter of the lead-out sleeve 2 is adjustable, adapting to heating coil 1 with a diameter range of DN15-DN100, improving structural compatibility.

[0034] In a further specific scheme, the value of α ranges from 105° to 135°, and the value of β ranges from 45° to 60°. The inner side of the lead-out sleeve 2 is equipped with a hard-seal displacement compensation structure. This structure includes a spherical sealing ring integrally formed from elastic metal material. The through-hole wall of the flat cover has a sealing cone surface. The sealing surface angle of the sealing cone surface is α (range 105°-135°), and the mating surface angle of the lead-out sleeve 2 corresponding to the sealing cone surface is β (range 104°-134°), with α > β. Tightening the locking nut 3 until the sealing surface of the lead-out sleeve 2 yields causes the installation gap between the lead-out sleeve 2 and the sealing surface of the flat cover to approach 0. The sealing cone surface of the through-hole of the flat cover compresses the spherical sealing ring of the lead-out sleeve 2, causing the spherical sealing ring to shrink and deform, forming an initial hard seal between metal and metal. The spherical sealing ring is uniformly stressed in the 360-degree direction, ensuring the stability of the initial seal.

[0035] Furthermore, when the system internal pressure P is loaded, increased, or fluctuates, the spherical sealing ring of the hard seal displacement compensation structure will expand or contract outward with the change of internal pressure, generating elastic deformation based on spring theory, forming a self-tightening secondary seal; the system internal pressure P is proportional to the effective contact pressure between the sealing cone surface and the spherical sealing ring. The higher the internal pressure, the greater the clamping force of the spherical sealing ring, and the better the sealing performance. It can withstand high pressure ≥10MPa, avoid media leakage, and is suitable for heating coil 1 connection scenarios with media such as heat transfer oil, steam, or hot water.

[0036] Overall technical solution of the invention: Installation and fixing working principle: First, a through hole is opened on the flat cover, and the lead-out sleeve 2 is inserted through the flat cover along the through hole axially; the inlet and outlet ends of the heating coil 1 pass through the inner hole of the lead-out sleeve 2, and the heating coil 1 and the inner wall of the lead-out sleeve 2 are sealed by argon arc welding, and a weld protection sleeve is fitted on the outside of the weld to protect the weld; an external thread is provided on the outside of the lead-out sleeve 2, and the locking nut 3 cooperates with the external thread to form a fine thread locking structure. A metal flat washer is installed between the contact surface of the locking nut 3 and the flat cover. Tightening the locking nut 3 can fix the lead-out sleeve 2 and the flat cover. At the same time, the outer peripheral wall of the locking nut 3 is provided with an anti-loosening groove, and an anti-loosening pin or anti-loosening washer is placed in the anti-loosening groove to prevent the locking nut 3 from loosening during operation.

[0037] Initial sealing working principle: The inner side of the lead-out sleeve 2 is provided with a hard sealing displacement compensation structure. This structure includes a spherical sealing ring integrally formed from elastic metal material. The through hole wall of the flat cover is provided with a sealing cone surface. The sealing surface angle of the sealing cone surface is α (range 105°-135°), and the mating surface angle of the lead-out sleeve 2 corresponding to the sealing cone surface is β (range 104°-134°) and α>β. Tighten the locking nut 3 until the sealing surface of the lead-out sleeve 2 yields, so that the installation gap between the lead-out sleeve 2 and the sealing surface of the flat cover approaches 0. The sealing cone surface of the through hole of the flat cover squeezes the spherical sealing ring of the lead-out sleeve 2, causing the spherical sealing ring to shrink and deform, forming an initial hard seal between metal and metal. The spherical sealing ring is uniformly stressed in 360 degrees, ensuring the stability of the initial seal.

[0038] Self-tightening seal working principle: When the internal pressure P of the system is loaded, increased or fluctuates, the spherical sealing ring of the hard seal displacement compensation structure will expand or contract outward with the change of internal pressure, and generate elastic deformation based on spring theory to form a self-tightening secondary seal; the internal pressure P of the system is proportional to the effective contact pressure between the sealing cone surface and the spherical sealing ring. The higher the internal pressure, the greater the clamping force of the spherical sealing ring, and the better the sealing performance. It can withstand high pressure of ≥10MPa, avoid media leakage, and is suitable for heating coil connection scenarios with media such as heat transfer oil, steam or hot water.

[0039] Displacement compensation working principle: The outer surface of the lead-out sleeve 2 is coated with an anti-corrosion coating (either a polytetrafluoroethylene coating or a ceramic coating) to prevent the lead-out sleeve 2 from being corroded during operation. When the internal temperature of the device system fluctuates, the locking nut 3, the flat cover and the lead-out sleeve 2 will produce slight displacement changes due to temperature differences and different coefficients of linear expansion. The spherical sealing ring of the hard-seal displacement compensation structure compensates for these slight displacements through elastic deformation based on the characteristics of its own elastic metal material, avoiding stress imbalance on the sealing surface and ensuring continuous sealing performance. At the same time, the inner diameter of the lead-out sleeve 2 is adjustable, and the diameter range of the heating coil 1 is DN15-DN100, which improves structural compatibility.

[0040] Disassembly and maintenance working principle: When it is necessary to replace the heating coil 1, there is no need to cut or re-weld. Simply remove the anti-loosening pin or anti-loosening washer in the anti-loosening groove, loosen the locking nut 3, and the lead-out sleeve 2 and the heating coil 1 can be taken out together from the through hole of the flat cover, realizing the quick replacement of the heating coil 1. After that, it can be reassembled according to the installation and fixing process, which greatly shortens the maintenance period and reduces maintenance costs.

[0041] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A connection structure for a flat-cover heating coil of a high-pressure quick-opening door device, characterized in that, It includes a heating coil, a lead-out sleeve, and a locking nut; the flat cover of the high-pressure quick-opening door device has a through hole, and the lead-out sleeve passes through the flat cover axially along the through hole; the outer side of the lead-out sleeve is provided with an external thread, and the locking nut cooperates with the external thread to form a threaded locking structure, and the lead-out sleeve is fixed to the flat cover by tightening the locking nut; The inner side of the lead-out sleeve is provided with a hard-seal displacement compensation structure, which includes a spherical sealing ring. The through hole wall of the flat cover is provided with a sealing cone surface. The sealing surface angle of the sealing cone surface is α, and the mating surface angle of the lead-out sleeve corresponding to the sealing cone surface is β, and α > β. The inlet and outlet ends of the heating coil pass through the inner hole of the lead-out sleeve, and the heating coil is sealed and welded to the inner wall of the lead-out sleeve.

2. The high-pressure quick-opening door device flat cover heating coil connection structure according to claim 1, characterized in that, The spherical sealing ring of the hard-seal displacement compensation structure is integrally molded from an elastic metal material.

3. The high-pressure quick-opening door device flat cover heating coil connection structure according to claim 1, characterized in that, The threaded locking structure has fine threads, and a metal flat washer is provided between the mating surfaces of the locking nut and the flat cover.

4. The high-pressure quick-opening door device flat cover heating coil connection structure according to claim 1, characterized in that, The inner diameter of the lead-out sleeve is adjustable, and the diameter range of the heating coil is DN15-DN100.

5. The high-pressure quick-opening door device flat cover heating coil connection structure according to claim 1, characterized in that, The outer peripheral wall of the locking nut is provided with an anti-loosening groove, and an anti-loosening pin or anti-loosening washer is disposed in the anti-loosening groove.

6. The high-pressure quick-opening door device flat cover heating coil connection structure according to claim 1, characterized in that, The sealing weld connection between the heating coil and the lead-out sleeve is argon arc welding, and a weld protection sleeve is fitted on the outside of the weld.

7. The high-pressure quick-opening door device flat cover heating coil connection structure according to claim 1, characterized in that, The outer surface of the lead-out sleeve is coated with an anti-corrosion coating, which is either a polytetrafluoroethylene coating or a ceramic coating.

8. The high-pressure quick-opening door device flat cover heating coil connection structure according to claim 1, characterized in that, The connection structure is suitable for heating coil connection scenarios corresponding to heat transfer oil, steam or hot water media.

9. The high-pressure quick-opening door device flat cover heating coil connection structure according to claim 1, characterized in that, The sealing surface angle α of the sealing cone surface ranges from 105° to 135°, and the mating surface angle β of the corresponding sealing cone surface of the lead-out sleeve ranges from 104° to 134°.

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