Multiple seal gas-tight closure

Abstract

The present application relates to the technical field of oil casing gas seal, and discloses a multiple sealing type gas seal, which comprises a lower pipe, the top end of the lower pipe is provided with an internal thread section, and the top end sealing surface of the lower pipe adopts an inclined surface design. The multiple sealing type gas seal can effectively solve the problem that in the prior art, the operation of oil well site is mostly in the wild environment, impurities such as wind sand, soil and metal debris widely exist, the main sealing surface of the existing gas seal is directly exposed to the outside world when the pipe is not connected, dust impurities are easy to adhere to the micro gap of the sealing surface during storage, and the bumping and collision in the transportation link can cause scratches and depressions on the sealing surface, thereby causing damage to the flatness of the metal sealing surface and wear, and these damages can directly cause the main sealing surface to fail to achieve close fitting when the subsequent pipe is connected, a small leakage channel is formed, high-pressure gas is easy to break through the seal along the channel, and sealing failure is caused.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil casing gas seal, in particular to a multi-sealing gas seal. BACKGROUND

[0002] In the field of oil and gas exploration, the connection and sealing performance of oil well pipes directly determines the safety and efficiency of the operation, especially in high-pressure, corrosive medium, and dusty and impure downhole and wellhead conditions. As the core sealing component of pipe connection, the sealing reliability of the gas seal is crucial. To meet the requirements of high pressure, high temperature and alternating load of oil wells, the industry widely uses metal-to-metal sealed gas seals to effectively block gas media and prevent safety accidents such as blowout and fire caused by leakage, and to achieve low-carbon exploration.

[0003] In the prior art, oil well site operations are mostly in outdoor environments, and impurities such as wind sand, soil, and metal debris are widely present. The main sealing surface of the existing gas seal is directly exposed to the outside when the pipe is not connected, and dust and impurities are easily attached to the microscopic gaps in the sealing surface during storage. The bumps and collisions during transportation can cause scratches and depressions on the sealing surface, causing damage to the flatness of the metal sealing surface and wear. These damages can directly cause the main sealing surface to fail to achieve close fitting during subsequent pipe connection, forming a small leakage channel, and high-pressure gas can easily break through the seal along the channel, causing sealing failure. SUMMARY

[0004] To overcome the above-mentioned shortcomings of the prior art, the present application provides a multi-sealing gas seal, which can effectively solve the problem that the oil well site operation is mostly in an outdoor environment, and impurities such as wind sand, soil, and metal debris are widely present. The main sealing surface of the existing gas seal is directly exposed to the outside when the pipe is not connected, and dust and impurities are easily attached to the microscopic gaps in the sealing surface during storage. The bumps and collisions during transportation can cause scratches and depressions on the sealing surface, causing damage to the flatness of the metal sealing surface and wear. These damages can directly cause the main sealing surface to fail to achieve close fitting during subsequent pipe connection, forming a small leakage channel, and high-pressure gas can easily break through the seal along the channel, causing sealing failure.

[0005] To achieve the above purpose, the present application is realized by the following technical scheme:

[0006] The present application provides a multi-sealing gas seal, comprising:

[0007] A lower pipe, which is hollow and cylindrical, has an internal threaded segment at the top end, and the top end sealing surface is designed with an inclined surface.

[0008] The inner wall surface of the upper pipe is provided with an outer thread section which is in close contact with the inner thread section surface, and the upper pipe is detachably connected with the lower pipe through thread connection, and the bottom end sealing surface of the upper pipe is designed as a slope which is in close contact with the top end sealing surface of the lower pipe.

[0009] The protection module comprises sleeves, two of which are in sliding connection with the circumferential outer surfaces of the upper pipe and the lower pipe respectively, a limiting groove is formed in the inner part of the sleeve on one side of the upper pipe, the upper pipe is in close contact with the inner wall surface of the limiting groove through the limiting block fixed on the circumferential outer surface thereof, the end surface of the sleeve is designed as a conical surface, the sleeve is in sliding connection with the protection plate through the inclined strip fixed on the outer surface thereof, the protection plate is used to cover the sealing surface of the upper pipe and the lower pipe, the protection plate is provided with a plurality of protection plates, and the outer surface of the sleeve is provided with a telescopic member for moving the plurality of protection plates.

[0010] Further, the telescopic member comprises a universal ball fixed on the outer surface of the protection plate, the end surface of the sleeve is rotatably connected with a rotating ring, the rotating ring is rotatably connected with a connecting rod through a ball shaft fixed on the outer end thereof, and the outer surface of the universal ball is rotatably connected with the end of the connecting rod away from the ball shaft.

[0011] Further, the side surface of the protection plate is designed as a magnetic attraction, the side surfaces of adjacent protection plates are attracted to each other, the side of the inclined strip away from the sleeve axis is designed as a magnetic attraction, and the side of the protection plate away from the sleeve axis is designed as a magnetic attraction.

[0012] Further, the inner wall surface of the sleeve on one side of the upper pipe is provided with a cavity, and the inner part of the cavity is provided with a redundant sealing member.

[0013] Further, the redundant sealing member comprises a sealing plate, a connecting rod is fixedly connected to the side of the sealing plate away from the sleeve axis, and the inner part of the sleeve on one side of the upper pipe is in sliding connection with the outer surface of the connecting rod.

[0014] Further, a wedge-shaped block is fixedly connected to the side of the sealing plate close to the connecting rod, a vertical rod is fixedly connected to the lower surface of the limiting block, the vertical rod extends to the outer surface of the wedge-shaped block through the limiting groove and into the cavity, the lower surface of the vertical rod is designed as a slope, and the inner wall bottom end of the limiting groove is provided with an elastic member which is in close contact with the lower surface of the limiting block.

[0015] Further, the circumferential outer surface of the lower pipe is provided with a sealing groove one, the circumferential outer surface of the upper pipe is provided with a sealing groove two, and the side of the sealing plate close to the sleeve axis is fixedly connected with a sealing ring. The sealing ring is provided with two, and the circumferential outer surfaces of the two sealing rings are in close contact with the inner wall surfaces of the sealing groove one and the sealing groove two respectively.

[0016] Further, the circumferential outer surface of the upper pipe is provided with a clamping groove, the inner wall surface of the clamping groove is slidably connected with a clamping block, and the inner wall surface of the clamping groove is provided with a spring matched with the inner surface of the clamping block.

[0017] Further, the upper surface of the sleeve on one side of the lower pipe is fixedly connected with a limiting column, the lower surface of the rotating ring on one side of the lower pipe is fixedly connected with a pushing block, the lower surface of the pushing block penetrates through the sleeve and extends to be matched with the outer surface of the sleeve, and the outer surface of the rotating ring on one side of the upper pipe is fixedly connected with a pushing block.

[0018] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0019] The present application is provided with a protective plate and a telescopic piece. When the lower pipe and the upper pipe are in an unconnected state, the sealing surfaces of the upper pipe and the lower pipe are covered by the protective plates on the corresponding sides. In each group, the adjacent sides of the adjacent protective plates are attracted to each other under the action of magnetic force. The lower surface of the protective plate corresponding to the lower pipe near the axis of the sleeve is close to the downwardly recessed sealing surface of the top end of the lower pipe and covers the sealing surface. The upper surface of the protective plate corresponding to the upper pipe near the axis of the sleeve is close to the downwardly protruding sealing surface of the bottom end of the upper pipe and covers the outer threaded section and the sealing surface of the bottom end of the upper pipe. In each group, the multiple protective plates form a closed annular conical structure, thereby completely wrapping the sealing surface and the outer threaded section, isolating dust, salt mist, rainwater, wind sand, mud and metal debris, and avoiding damage to the flatness and wear of the sealing surface. The sealing surface and the outer threaded section can be effectively prevented from being damaged by collision and scratching during transportation and storage, and dust and impurities can be prevented from entering the sealing area, thereby prolonging the service life of the product and ensuring the sealing performance during connection. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical schemes in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a schematic view of the three-dimensional structure of the embodiment of the present application;

[0022] Figure 2 is a schematic view of the cross-sectional structure of the connected state of the lower pipe and the upper pipe in the embodiment of the present application;

[0023] Figure 3 is a schematic view of the three-dimensional structure of the embodiment of the present application; Figure 2 is a schematic view of the structure of the local enlargement at A in the embodiment of the present application.

[0024] Figure 4 Structure diagram of the local magnification at B in the embodiment of the present application Figure 2 Structure diagram of the local magnification at B in the embodiment of the present application

[0025] Figure 5 Structure diagram of the separation of the lower pipe, the upper pipe and the sleeve in the embodiment of the present application

[0026] Figure 6 Structure diagram of the contraction state of the lower pipe, the sleeve and the protection plate in the embodiment of the present application

[0027] Figure 7 Structure diagram of the cross section of the upper pipe and the sleeve in the embodiment of the present application

[0028] Figure 8 Structure diagram of the cross section of the sealing plate, the connecting rod and the sleeve in the embodiment of the present application

[0029] Figure 9 Structure diagram of the redundant sealing element in the embodiment of the present application

[0030] The numbers in the figure respectively represent: 1, lower pipe; 11, sealing groove one; 2, upper pipe; 21, limiting block; 22, sealing groove two; 23, clamping groove; 231, clamping block; 232, spring; 3, protection module; 31, sleeve; 310, inclined strip; 311, limiting groove; 312, cavity; 32, protection plate; 33, telescopic element; 331, rotating ring; 3311, pushing block; 3312, pushing block; 332, connecting rod; 34, redundant sealing element; 341, sealing plate; 342, connecting rod; 343, wedge-shaped block; 344, vertical rod; 345, elastic element; 346, sealing ring; 35, limiting column. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0032] The present application will be further described below in combination with the embodiments.

[0033] Embodiment:

[0034] Please refer to Figures 1-9 The present application provides a technical scheme: a multiple sealing type air sealing buckle, comprising:

[0035] The lower pipe 1 is in a hollow cylinder shape, and a threaded section is arranged at the top end of the lower pipe 1. The top end sealing surface of the lower pipe 1 is designed as an inclined surface, which helps to improve the tightness of the sealing.

[0036] The upper pipe 2 is arranged with an external threaded section on the inner wall surface thereof, which is matched with the surface of the threaded section. The upper pipe 2 is detachably connected with the lower pipe 1 through threaded connection, which facilitates the installation and dismounting. The bottom end sealing surface of the upper pipe 2 is designed as an inclined surface matched with the top end sealing surface of the lower pipe 1, and cooperates with the inclined sealing surface of the lower pipe 1 to form a first resealing.

[0037] The protection module 3 comprises two sleeve pipes 31, which are slidably connected with the circumferential outer surfaces of the upper pipe 2 and the lower pipe 1. A limiting groove 311 is arranged in the sleeve pipe 31 located at one side of the upper pipe 2. The upper pipe 2 is limited in the vertical direction by the inner wall surface of the limiting groove 311 through the limiting block 21 fixed on the circumferential outer surface thereof. The end surface of the sleeve pipe 31 is designed as a conical surface. The sleeve pipe 31 is slidably connected with the protection plate 32 through the inclined strip 310 fixed on the outer surface thereof. The protection plate 32 is used to cover the sealing surfaces of the upper pipe 2 and the lower pipe 1 to prevent the sealing surfaces from being polluted. The protection plate 32 is arranged with a plurality of protection plates. The outer surface of the sleeve pipe 31 is arranged with the telescopic member 33 for retracting the plurality of protection plates 32.

[0038] The telescopic member 33 comprises a universal ball fixed on the outer surface of the protection plate 32. The end surface of the sleeve pipe 31 is rotatably connected with the rotating ring 331. The rotating ring 331 is rollingly connected with the connecting rod 332 through the ball shaft fixed on the outer end thereof. The outer surface of the universal ball is rotatably connected with the end of the connecting rod 332 away from the ball shaft. When the operator rotates the knob 3312 or the knob 3311, the rotating ring 331 rotates, and the connecting rod 332 drives the protection plate 32 to slide along the inclined strip 310 through the transmission, so as to realize the retraction and expansion of the protection plate 32. For example, when the rotating ring 331 rotates clockwise by rotating the knob 3312, the connecting rod 332 pulls the protection plate 32 to slide along the inclined strip 310 away from the axis of the sleeve pipe 31, so as to expand the protection plate 32. When the knob 3312 is reversely rotated, the protection plate 32 is retracted.

[0039] The side surface of the protection plate 32 is designed as a magnetic attraction surface. The side surfaces of the adjacent protection plates 32 are attracted to each other. The side of the inclined strip 310 away from the axis of the sleeve pipe 31 is designed as a magnetic surface. The side of the protection plate 32 away from the axis of the sleeve pipe 31 is designed as a magnetic surface. When the protection plate 32 is retracted, the magnetic attraction surfaces of the adjacent protection plates 32 are attracted to each other, so as to keep the protection plate 32 in a stable state of close contact. When the protection plate 32 is expanded, the protection plate 32 cooperates with the magnetic surface of the inclined strip 310, so as to further enhance the stability of the protection plate 32 in the expanded state.

[0040] A cavity 312 is formed on the inner wall surface of the sleeve 31 on one side of the upper pipe 2, and a redundant sealing member 34 is arranged in the cavity 312, serving as a second redundant sealing guarantee.

[0041] The redundant sealing member 34 comprises a sealing plate 341, and a connecting rod 342 is fixedly connected to the side of the sealing plate 341 away from the axis of the sleeve 31. The outer surface of the connecting rod 342 is in sliding connection with the inside of the sleeve 31 on one side of the upper pipe 2, and the connecting rod 342 is lower on the side away from the axis of the sleeve 31 and higher on the side close to the axis of the sleeve 31, so that it can be automatically reset under the action of gravity.

[0042] A wedge-shaped block 343 is fixedly connected to the side of the sealing plate 341 close to the connecting rod 342, a vertical rod 344 is fixedly connected to the lower surface of the limiting block 21, the lower surface of the vertical rod 344 penetrates through the limiting groove 311 and extends into the cavity 312 to be in close contact with the outer surface of the wedge-shaped block 343, and the lower surface of the vertical rod 344 is designed as an inclined surface. The inner wall bottom of the limiting groove 311 is provided with an elastic member 345 in close contact with the lower surface of the limiting block 21. When the sleeve 31 moves downward, the limiting block 21 slides in the limiting groove 311, compressing the elastic member 345, and at the same time, the vertical rod 344 contacts the wedge-shaped block 343, which is driven to move in the direction close to the axis of the pipe by the inclined surface.

[0043] The circumferential outer surface of the lower pipe 1 is provided with a sealing groove one 11, the circumferential outer surface of the upper pipe 2 is provided with a sealing groove two 22, and the side of the sealing plate 341 close to the axis of the sleeve 31 is fixedly connected with a sealing ring 346. The sealing ring 346 is provided with two, and the circumferential outer surfaces of the two sealing rings 346 are respectively in close contact with the inner wall surfaces of the sealing groove one 11 and the sealing groove two 22, realizing redundant sealing.

[0044] The circumferential outer surface of the upper pipe 2 is provided with a clamping groove 23, the inner wall surface of the clamping groove 23 is slidingly connected with a clamping block 231, and the inner wall of the clamping groove 23 is provided with a spring 232 in close contact with the inner surface of the clamping block 231. The clamping block 231 can be ejected under the action of the spring 232 to limit the position of the sleeve 31 and prevent it from moving in the non-operating state.

[0045] A limiting column 35 is fixedly connected to the upper surface of the sleeve 31 on one side of the lower pipe 1, a driving block 3311 is fixedly connected to the lower surface of the rotating ring 331 on one side of the lower pipe 1, the lower surface of the driving block 3311 penetrates through the sleeve 31 and extends to its outer surface, and a driving block 3312 is fixedly connected to the outer surface of the rotating ring 331 on one side of the upper pipe 2. The driving block 3311 and the driving block 3312 facilitate the rotation of the rotating ring 331 by the operator, realizing the contraction and expansion operation of the protective plate 32.

[0046] The sealing surface of the bottom end of the upper pipe 2 is designed as a downward convex slope, and the height of the sealing surface of the upper pipe 2 close to the axis is lower than that far from the axis. The bottom end of the sleeve 31 of the upper pipe 2 is also designed as a downward convex taper surface. The upper group of protective plates 32 is connected by sliding through the inclined strips 310 fixed on the lower surface of the sleeve 31.

[0047] The sealing surface of the top end of the lower pipe 1 is designed as a downward concave slope, and the height of the sealing surface of the lower pipe 1 close to the axis is lower than that far from the axis. The top end of the sleeve 31 of the lower pipe 1 is also designed as a downward concave taper surface, and the lower group of protective plates 32 is connected by sliding through the inclined strips 310 fixed on the upper surface of the sleeve 31.

[0048] In the initial state, the lower pipe 1 and the upper pipe 2 are in a separated state, and the sleeve 31, the protective plate 32 and the telescopic piece 33 are all provided with two groups, one group corresponding to the lower pipe 1 and the other group corresponding to the upper pipe 2. The two groups of protective plates 32 are in a contracted state, and each group is provided with four protective plates 32. In each group, the side surfaces of the adjacent protective plates 32 attract each other, and each group of protective plates 32 is combined into a closed annular taper structure, and the contracted protective plates 32 are close to the axis of the sleeve 31.

[0049] At this time, the lower surface of the protective plate 32 close to the axis of the sleeve 31 corresponding to the lower pipe 1 is close to the downward concave sealing surface of the top end of the lower pipe 1, covering the sealing surface of the lower pipe 1; the upper surface of the protective plate 32 close to the axis of the sleeve 31 corresponding to the upper pipe 2 is close to the downward convex sealing surface of the bottom end of the upper pipe 2, covering the sealing surface of the upper pipe 2, and also covering and protecting the external thread segment of the bottom end of the upper pipe 2.

[0050] The sleeve 31 corresponding to the upper pipe 2 is close to the sealing surface of the upper pipe 2 within its stroke range, and the elastic piece 345 inside the limiting groove 311 is in an expanded state. The upper surface of this group of protective plates 32 is close to the lower surface of this group of sleeves 31 and the sealing surface of the bottom end of the upper pipe 2. The sleeve 31 corresponding to the lower pipe 1 is close to the sealing surface of the lower pipe 1 within its stroke range, and the lower surface of this group of protective plates 32 is close to the upper surface of this group of sleeves 31 and the sealing surface of the top end of the lower pipe 1.

[0051] At the same time, the spring 232 in the clamping groove 23 is in a compressed state, and the outer surface of the clamping block 231 is close to the inner wall surface of the sleeve 31 on one side of the upper pipe 2.

[0052] The connection process of the lower pipe 1 and the upper pipe 2:

[0053] In the installation, first, the operator rotates the knob 3311, and the rotating ring 331 located in the lower pipe 1 position is rotated. The knob 3311 drives the rotating ring 331 to rotate forward at the upper end of the sleeve 31, and the ball shaft on the outer surface of the rotating ring 331 rotates, driving the outer end of the connecting rod 332 close to the ball shaft to move synchronously, at this time, the connecting rod 332 pulls the protective plate 32 along the inclined strip 310 to slide away from the axis of the sleeve 31 by rolling the universal ball inside it. The protective plate 32 slides along the tapered upper surface of the sleeve 31, and slides upward while moving away from the axis of the sleeve 31, and the whole is inclined sliding. After the protective plate 32 is unfolded, the distance between adjacent protective plates 32 increases, and the adjacent surfaces of the protective plate 32 are no longer connected by magnetic force, and at the same time, the protective plate 32 cooperates with the magnetic surface of the inclined strip 310 to make the protective plate 32 stable and unfolded, and the protective plate 32 no longer covers the sealing surface of the lower pipe 1. At the same time, the unfolded protective plate 32 no longer abuts with the sealing surface of the top end of the lower pipe 1, and only abuts with the upper surface of the corresponding sleeve 31.

[0054] Then, the sleeve 31 is axially slid along the circumferential outer surface of the lower pipe 1, so that the protective plate 32 is away from the sealing surface of the top end of the lower pipe 1. At this time, the sleeve 31 is at the lowermost end of its stroke range, and the top end of the lower pipe 1 is in a completely exposed state.

[0055] The knob 3312 is rotated, and the rotating ring 331 located in the upper pipe 2 position is rotated. The knob 3312 drives the rotating ring 331 to rotate forward at the bottom end of the sleeve 31, and the ball shaft on the outer surface of the rotating ring 331 rotates, driving the outer end of the connecting rod 332 close to the ball shaft to move synchronously along an arc path, at this time, the connecting rod 332 pulls the protective plate 32 along the outer surface of the inclined strip 310 to slide away from the axis of the sleeve 31 by rolling the universal ball inside it. The protective plate 32 slides along the tapered lower surface of the sleeve 31, and slides upward while moving away from the axis of the sleeve 31, and the whole is inclined sliding. After the protective plate 32 is unfolded, the distance between adjacent protective plates 32 increases, and the adjacent surfaces of the protective plate 32 are no longer connected by magnetic force, and at the same time, the protective plate 32 cooperates with the magnetic surface of the inclined strip 310 to make the protective plate 32 stable and unfolded. At the same time, the unfolded protective plate 32 no longer abuts with the sealing surface of the top end of the upper pipe 2, and only abuts with the lower surface of the corresponding sleeve 31.

[0056] The limiting groove 311 is provided with an elastic member 345, which is preferably a compression spring. The top end of the elastic member 345 is connected with the lower surface of the limiting block 21, and the bottom end is abutted with the inner wall bottom of the limiting groove 311. Under the action of the elastic force of the elastic member 345, the sleeve 31 is still below its stroke range, and the lower surface of the vertical rod 344 is not in contact with the inclined surface of the wedge-shaped block 343, and there is a distance in the vertical direction.

[0057] Then, the outer threaded section of the upper pipe 2 is aligned with the inner threaded section of the lower pipe 1, and the upper pipe 2 is started to be screwed to be connected with the lower pipe 1 through the threads. The corresponding sleeve 31 of the lower pipe 1 is fixedly connected with a limiting column 35 on the upper surface, and in the connecting process, as the upper pipe 2 is rotated, the lower surface of the rotating ring 331 on the upper side gradually fits the upper surface of the limiting column 35. When the upper pipe 2 continues to rotate, the lower pipe 1 and the two sleeves 31 are in a relatively static state, and only the upper pipe 2 moves downward in the vertical direction. The limiting block 21 and the upper pipe 2 move relative to the limiting groove 311, the height between the limiting block 21 and the inner wall bottom of the limiting groove 311 gradually decreases, and the elastic member 345 is compressed.

[0058] At the same time, the vertical rod 344 moves downward with the limiting block 21 and enters the cavity 312 to contact the wedge-shaped block 343. Since the lower surface of the vertical rod 344 is designed as an inclined surface, in the process of moving downward of the vertical rod 344, the inclined surface drives the wedge-shaped block 343 to move towards the axis of the upper pipe 2 and the lower pipe 1, thereby driving the sealing plate 341 and the connecting rod 342 to move.

[0059] When the outer threaded section of the upper pipe 2 and the inner threaded section of the lower pipe 1 are completely screwed, the inclined sealing surfaces of the lower pipe 1 and the upper pipe 2 fit to form the first resealing. At this time, when the sealing plate 341 moves to the appropriate position under the action of the vertical rod 344, the two sealing rings 346 on the inner surface of the sealing plate 341 respectively fit the sealing groove one 11 and the sealing groove two 22 to achieve redundant sealing.

[0060] At this time, the sleeve 31 on the upper side is at the highest point in the range of the travel of the outer surface of the upper pipe 2, the elastic member 345 is in a compressed state, the clamping block 231 in the clamping groove 23 loses the limitation of the circumferential inner wall of the sleeve 31, and under the action of the spring 232, the clamping block 231 is in an unfolded state, the lower surface of the clamping block 231 fits the top end of the sleeve 31 on the side, so that the sleeve 31 is locked at the position to ensure the air tightness of the pipeline.

[0061] When disassembly is needed, first, the operator presses the clamping block 231 to make it retract into the clamping groove 23 to release the limitation on the sleeve 31. Then, the threaded connection of the upper pipe 2 and the lower pipe 1 is unscrewed, and under the elastic force of the elastic member 345, the bottom end of the sleeve 31 on the upper side again approaches the sealing surface at the bottom end of the upper pipe 2. After losing the pressure of the inclined surface of the vertical rod 344, the sealing plate 341 and the sealing rings 346 on the inner surface thereof no longer fit the inside of the sealing groove one 11 and the sealing groove two 22, and the sealing plate 341 gradually moves away from the position of the sealing surface of the upper pipe 2 and the lower pipe 1, and the double sealing is opened.

[0062] Finally, reverse rotation dial block 3312 and dial block 3311, rotating ring 331 outer surface of the ball shaft and rotate, drive link 332 close to the outer end of the ball shaft synchronous arc path movement, at this time, link 332 by rolling in its internal universal ball pull protective plate 32 along the outer surface of the inclined bar 310 to the sleeve 31 axis line direction sliding. Protective plate 32 along the tapered surface of the sleeve 31 sliding, while moving to the sleeve 31 axis line direction also slides down, the overall is oblique sliding. Protective plate 32 retraction, the protective plate 32 and the magnetic surface of the inclined bar 310 no longer attracted, the adjacent protective plate 32 spacing decreases, until the complete fit under the action of the magnetic force, two groups of protective plate 32 are combined into a closed ring cone structure, shielding the sealing surface of the upper pipe 2 and the lower pipe 1.

[0063] In summary, the protective module 3 has the following advantages:

[0064] Advantage one, when the lower pipe 1 and the upper pipe 2 are in an unconnected state, the sealing surface of the upper pipe 2 and the lower pipe 1 is covered by the corresponding side of the protective plate 32. In each group, the adjacent side of the adjacent protective plate 32 is attracted to each other under the action of magnetic force. The lower surface of the protective plate 32 corresponding to the lower pipe 1 near the axis line of the sleeve 31 is close to the downwardly recessed sealing surface of the top end of the lower pipe 1 and covers the sealing surface. The upper surface of the protective plate 32 corresponding to the upper pipe 2 near the axis line of the sleeve 31 is close to the downwardly protruding sealing surface of the bottom end of the upper pipe 2 and covers the outer threaded segment and the sealing surface of the bottom end of the upper pipe 2. In each group, the plurality of protective plates 32 form a closed ring cone structure, thereby completely wrapping the sealing surface and the outer threaded segment, isolating dust, salt spray, rainwater and solid particles, effectively preventing the sealing surface and the outer threaded segment from being damaged by collision and scratching during transportation and storage, and preventing dust and impurities from entering the sealing area, thereby prolonging the service life of the product and ensuring the sealing performance during connection.

[0065] Advantage two, during installation, rotating the dial block 3311 or the dial block 3312 drives the rotating ring 331 to rotate, thereby causing the link 332 to pull the protective plate 32 to slide away from the axis line of the sleeve 31 along the inclined bar 310, causing the protective plate 32 to move away from the sealing surface. Then, the sleeve 31 is axially slid along the circumferential outer surface of the lower pipe 1, and finally the outer threaded segment of the upper pipe 2 is aligned with the inner threaded segment of the lower pipe 1 and screwed, thereby completing the connection. The entire installation process is simple to operate and does not require complex tools and steps, making the installation more convenient and efficient.

[0066] Advantage three, when the upper pipe fitting 2 outer thread segment and the lower pipe fitting 1 inner thread segment are fully screwed, the clamping block 231 in the clamping groove 23 is unfolded under the action of the spring 232, the lower surface of the clamping block 231 is attached to the top end of the side sleeve 31, the sleeve 31 is locked in the position, the air tightness of the pipeline is ensured. When disassembling, the clamping block 231 is pressed to make it retract into the clamping groove 23, the sleeve 31 is released, then the upper pipe fitting 2 and the lower pipe fitting 1 are screwed. The locking and unlocking operation is convenient, the stability in the connected state and the convenience in disassembling are effectively ensured, the problems of unstable connection or difficult disassembling of the existing products are solved.

[0067] Advantage four, the sealing surface of the bottom end of the upper pipe fitting 2 adopts a downward protruding inclined surface design, the sealing surface of the top end of the lower pipe fitting 1 adopts a downward recessed inclined surface design, and the height of the sealing surface near the axis is lower than the height far from the axis. The inclined surface design of the sealing surface makes the sealing surface form face-to-face attachment and wedge-shaped extrusion effect during the screwing process, the contact pressure increases synchronously with the tightening torque, compared with the traditional sealing structure, the gas leakage rate is reduced, and it is suitable for high pressure working conditions. The complementary design of the concave-convex of the sealing surfaces of the lower pipe fitting 1 and the upper pipe fitting 2 has an assembly guide function, which can automatically correct the coaxiality deviation of the lower pipe fitting 1 and the upper pipe fitting 2, avoid the problem of local poor attachment of the sealing surface caused by alignment deviation of the existing products, improve the assembly qualification rate, make the lower pipe fitting 1 and the upper pipe fitting 2 more accurately attached when connected, and further improve the sealing effect.

[0068] Advantage five, the inclined sealing surfaces of the lower pipe fitting 1 and the upper pipe fitting 2 are attached to form a first heavy seal; at the same time, the inner surface of the sealing plate 341 is attached to the inside of the sealing groove one 11 and the sealing groove two 22 under the action of the vertical rod 344, redundant sealing is realized, compared with the existing single sealing structure product, the reliability and stability of the sealing are greatly improved, and gas leakage is effectively prevented. Compared with the existing single sealing structure, the present application has double sealing protection, when the main seal is aged and worn due to long-term use, the redundant seal can play a role immediately to avoid sudden leakage.

[0069] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A multiple-seal, air-tight closure, characterized by, Include: Lower pipe (1), the top end of the lower pipe (1) is provided with an internal thread section, the top end sealing surface of the lower pipe (1) adopts an inclined surface design; Upper pipe (2), the inner wall surface of the upper pipe (2) is provided with an external thread section which is in close contact with the surface of the internal thread section, and the bottom end sealing surface of the upper pipe (2) adopts an inclined surface design which is in close contact with the top end sealing surface of the lower pipe (1); Protection module (3), the protection module (3) includes a sleeve (31), the sleeve (31) is provided with two, the two sleeves (31) are respectively connected with the circumferential outer surface of the upper pipe (2) and the lower pipe (1) slidingly, the inside of the sleeve (31) located on one side of the upper pipe (2) is provided with a limiting groove (311), the upper pipe (2) is in close contact with the inner wall surface of the limiting groove (311) through the limiting block (21) fixed on the circumferential outer surface thereof, the end surface of the sleeve (31) adopts a conical surface design, the sleeve (31) is slidingly connected with a protection plate (32) through the inclined strip (310) fixed on the outer surface thereof, the protection plate (32) is used for covering the sealing surface of the upper pipe (2) and the lower pipe (1), the protection plate (32) is provided with a plurality of, the outer surface of the sleeve (31) is provided with a telescopic member (33) for moving the plurality of protection plates (32); The telescopic member (33) includes a universal ball fixed on the outer surface of the protection plate (32), the end surface of the sleeve (31) is rotatably connected with a rotating ring (331), the rotating ring (331) is rollingly connected with a connecting rod (332) through the ball shaft fixed on the outer end thereof, and the end of the connecting rod (332) away from the ball shaft is rotatably connected with the outer surface of the universal ball.

2. The multiple-seal gas-tight closure of claim 1, wherein: The side surface of the protection plate (32) adopts a magnetic attraction design, the side surfaces of adjacent protection plates (32) are attracted to each other, the side of the inclined strip (310) away from the axis of the sleeve (31) adopts a magnetic design, and the side of the protection plate (32) away from the axis of the sleeve (31) adopts a magnetic design.

3. A multiple seal gas tight closure as claimed in claim 2, wherein: The inner wall surface of the sleeve (31) located on one side of the upper pipe (2) is provided with a cavity (312), and the inside of the cavity (312) is provided with a redundant sealing member (34).

4. The multiple-seal gas-tight closure of claim 3, wherein: The redundant sealing member (34) includes a sealing plate (341), the connecting rod (342) is fixedly connected to the side of the sealing plate (341) away from the axis of the sleeve (31), and the inside of the sleeve (31) located on one side of the upper pipe (2) is slidingly connected with the outer surface of the connecting rod (342).

5. The multiple-seal, air-tight closure of claim 4, wherein: The side of the sealing plate (341) close to the connecting rod (342) is fixedly connected with a wedge-shaped block (343), the lower surface of the limiting block (21) is fixedly connected with a vertical rod (344), the lower surface of the vertical rod (344) penetrates through the limiting groove (311) and extends into the cavity (312) and is in close contact with the outer surface of the wedge-shaped block (343), the lower surface of the vertical rod (344) adopts an inclined surface design, and the inner wall bottom end of the limiting groove (311) is provided with an elastic member (345) which is in close contact with the lower surface of the limiting block (21).

6. A multiple seal gas tight closure as claimed in claim 5, wherein: The circumferential outer surface of the lower pipe (1) is provided with a sealing groove one (11), the circumferential outer surface of the upper pipe (2) is provided with a sealing groove two (22), the sealing plate (341) is fixedly connected with a sealing ring (346) on the side close to the axis of the sleeve (31).

7. A multiple seal gas tight closure as claimed in claim 6, wherein: The circumferential outer surface of the upper pipe (2) is provided with a clamping groove (23), the inner wall surface of the clamping groove (23) is slidably connected with a clamping block (231), and the inner wall surface of the clamping groove (23) is provided with a spring (232) in contact with the inner surface of the clamping block (231).

8. The multiple-seal gas-tight closure of claim 7, wherein: The upper surface of the sleeve (31) on one side of the lower pipe (1) is fixedly connected with a limiting column (35), the lower surface of the rotating ring (331) on one side of the lower pipe (1) is fixedly connected with a pushing block (3311), the lower surface of the pushing block (3311) penetrates through the sleeve (31) and extends to be in contact with the outer surface of the sleeve (31), and the outer surface of the rotating ring (331) on one side of the upper pipe (2) is fixedly connected with a pushing block (3312).

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