A natural gas pipeline sealing connection assembly

Abstract

The present invention relates to the technical field of pipeline sealing, and specifically to a natural gas pipeline sealing connection assembly, comprising a first sealing mechanism and a connecting ring installed on one side of the first sealing mechanism, wherein a second sealing mechanism is arranged inside the first sealing mechanism, and a first air pipe and a second air pipe are arranged inside the second sealing mechanism respectively, the first sealing mechanism comprises a first sealing sleeve, a first through hole is provided inside the first sealing sleeve, and a first limiting protrusion is fixedly installed on one side of the inside of the first through hole, wherein a liquid injection cavity is provided around the inside of the first sealing sleeve, and a liquid injection port is provided on one side of the end of the liquid injection cavity, by providing the first sealing mechanism, not only can a liquid injection knob be used to drive a liquid injection threaded rod to rotate inside the sealing threaded sleeve, but the liquid injection threaded rod can also push a liquid injection piston to slide inside the liquid injection cavity, thereby injecting the polyurethane sealant inside the liquid injection cavity into the inside of the first sealing sleeve through the liquid injection port, thereby improving the sealing performance of the entire connection assembly.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline sealing, in particular to a natural gas pipeline sealing connection component. Background Art

[0002] A natural gas pipeline is a pipeline that transports natural gas, including associated gas produced by oil fields, from the mining site or processing plant to the urban gas distribution center or industrial enterprise users. It is also called a gas transmission pipeline. Using a natural gas pipeline to transport natural gas is the only way to transport natural gas in large quantities on land. Natural gas pipelines account for about half of the total length of pipelines in the world. When laying a natural gas pipeline, the connection of two pipelines is a crucial step in laying a natural gas pipeline. If there is a problem with the connection, it will be very difficult to remedy it after the gas supply is supplied later. Existing natural gas pipelines are basically connected using flanges and bolts. Although the structure is simple, the sealing is not good enough, and installation and disassembly are also more troublesome.

[0003] Publication No. CN 213871529 U discloses a natural gas pipeline sealing connection assembly. During installation, a first fixing ring is set on a first gas pipe, and then a first connecting sleeve is slidably set on the first gas pipe. Then, a first sealing ring and a first sealing member are respectively sleeved on the first gas pipe and located between the first fixing ring and the first connecting sleeve. At this time, a first detection cylinder is connected to the first connecting sleeve, and a first natural gas detection assembly is set on the first connecting sleeve, and a second natural gas detection assembly is connected to the first detection cylinder. The setting method of a second fixing ring, a second sealing ring, a second sealing member and a second detection cylinder on the second gas pipe is the same as the setting method of the first gas pipe. Since a threaded sleeve is provided on the first connecting sleeve and an internal thread is provided on the second connecting sleeve, when sealing the gas pipe, a third sealing member is first slidably set on the first gas pipe and slidably connected with the second gas pipe, and then the third sealing ring is sleeved on the threaded sleeve, and then the third sealing ring is screwed on the threaded sleeve. The second connecting sleeve is turned, the first connecting sleeve and the second connecting sleeve are threadedly connected and the third sealing ring is compressed. During the locking process, the first connecting sleeve and the first fixing ring compress the first sealing ring and the first sealing member, and the second connecting sleeve and the second fixing ring compress the second sealing ring and the second sealing member. At the same time, during the compression process, the first air pipe and the second air pipe are compressed by the third sealing member. The preset value is set on the first natural gas detection component, the second natural gas detection component and the third natural gas detection component. When the natural gas leakage in the connecting sleeve reaches a certain concentration, the alarm light and the horn are lit and the alarm sounds. The utility model has a simple structure, is easy to install and disassemble, and has a good sealing effect. It can monitor natural gas and maintain it in time when leakage occurs. It is safer and more reliable, saves energy loss, and is more environmentally friendly. However, the patent still has the following problems in actual use:

[0004] When the natural gas pipeline sealing connection assembly is used to connect the natural gas pipeline, the first gas pipe and the second gas pipe need to be inserted into the interior of the connection assembly for sealing connection. However, in actual use, since the gas pipeline is fixed, it is not convenient to insert the gas pipeline into the interior of the sealing connection assembly when replacing the connection of the gas pipeline, and thus it is not convenient to replace the sealing ring inside the pipeline. At the same time, when the connection of the gas pipeline is damaged, the pipeline needs to be cut, resulting in the phenomenon of shortening the pipeline, and the natural gas pipeline sealing connection assembly is not convenient for connecting the shortened pipeline.

[0005] A natural gas pipeline sealing connection assembly is proposed to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a natural gas pipeline sealing connection assembly to solve the problem proposed in the above background technology that when the natural gas pipeline sealing connection assembly is used to connect the natural gas pipeline, it is necessary to insert the first gas pipe and the second gas pipe into the interior of the connection assembly for sealing connection. However, in actual use, since the gas pipeline is fixed, it is not convenient to insert the gas pipeline into the interior of the sealing connection assembly when replacing the connection of the gas pipeline, thereby making it inconvenient to replace the sealing ring inside the pipeline. At the same time, when the connection of the gas pipeline is damaged, it is necessary to cut the pipeline, thereby causing the pipeline to become shorter, and the natural gas pipeline sealing connection assembly is not convenient for connecting the shortened pipeline.

[0007] To achieve the above object, the present invention provides the following technical solution: a natural gas pipeline sealing connection assembly, comprising a first sealing mechanism, and a connecting ring installed on one side of the first sealing mechanism;

[0008] A second sealing mechanism is disposed inside the first sealing mechanism, and a first air pipe and a second air pipe are disposed inside the second sealing mechanism respectively;

[0009] Also includes:

[0010] The first sealing mechanism comprises a first sealing sleeve, a first through hole is formed inside the first sealing sleeve, and a first limiting protrusion is fixedly mounted on one side of the interior of the first through hole;

[0011] Wherein, a liquid injection cavity is provided around the interior of the first sealing sleeve, and a liquid injection port is provided on one side of the end of the liquid injection cavity;

[0012] Among them, one end of the liquid injection cavity close to the liquid injection port is fixedly connected with a damping telescopic rod, and the outer side of the damping telescopic rod is slidably connected with a damping spring.

[0013] Preferably, a sealing baffle is fixedly connected to the bottom of the damping spring, a sealing threaded sleeve is fixedly installed on the end of the injection chamber away from the injection port, the internal thread of the sealing threaded sleeve is connected to the injection threaded rod, one end of the injection threaded rod is fixedly connected to the injection piston, and the end of the injection threaded rod away from the injection piston is fixedly connected to the injection knob.

[0014] Preferably, the connecting ring is fixedly installed on one end of the first sealing sleeve close to the first limiting protrusion, a plurality of deformation grooves are opened inside the connecting ring, a connecting thread is opened on the outer side of the connecting ring, the outer thread of the connecting ring is connected to a locking thread sleeve, and a locking ring is fixedly installed on the outer side of the end of the locking thread sleeve.

[0015] Preferably, the second sealing mechanism includes a sealing connecting tube, connecting sliding tubes are symmetrically installed at both ends of the sealing connecting tube, connecting sliding grooves are opened around the inner side of the connecting sliding tube, the first air pipe and the second air pipe are respectively installed inside the connecting sliding tube, and rotating gears are symmetrically installed at both ends of the sealing connecting tube.

[0016] Preferably, a meshing tooth groove is opened on the inner side of the rotating gear, and meshing gears are meshingly connected around the inner side of the meshing tooth groove, a translation threaded rod is fixedly connected to one side of the meshing gear, a translation threaded sleeve is threadedly connected to the middle part of the translation threaded rod, a translation bracket is fixedly connected between the translation threaded sleeves, and a sealing ring is fixedly connected to the outer side of the translation bracket.

[0017] Preferably, the first air pipe and the second air pipe are respectively slidably connected to the connecting sliding tube, the rotating gear is respectively rotatably connected to the sealing connecting tube and the connecting sliding tube, the meshing gear is rotatably connected to the connecting sliding tube, the translation threaded sleeve is slidably connected to the connecting sliding tube through a connecting sliding groove, the translation bracket and the sealing ring are both fit-connected to the inner wall of the connecting sliding tube, and the sealing ring is fit-connected to the ends of the first air pipe and the second air pipe.

[0018] Preferably, the first sealing sleeve is threadedly connected to the connecting sliding tube, the injection piston is slidingly connected to the first sealing sleeve through the injection chamber, the damping telescopic rod is fit-connected to the sealing baffle, the sealing baffle is fit-connected to the injection port, and the first sealing sleeve and the connecting ring are both sleeved on the outside of the first air pipe and the second air pipe.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the natural gas pipeline sealing connection assembly, by providing the first sealing mechanism, can not only utilize the injection knob to drive the injection piston to slide inside the injection chamber, but also, by providing the connecting ring and the deformation groove, can utilize the characteristics of the threaded connection between the locking threaded sleeve and the connecting ring to achieve the fixation of the first sealing sleeve and the first air pipe and the second air pipe, and by providing the second sealing mechanism, can not only make the sealing ring fit and connect with the ends of the first air pipe and the second air pipe by rotating the rotating gear, but also utilize the characteristics of the sealing ring sliding inside the connecting sliding pipe to connect the first air pipe and the second air pipe of different lengths, and the specific contents are as follows:

[0020] 1. By setting the first sealing mechanism, not only can the injection knob be used to drive the injection threaded rod to rotate inside the sealing threaded sleeve, but the injection threaded rod can also push the injection piston to slide inside the injection cavity, so that the polyurethane sealant inside the injection cavity is injected into the first sealing sleeve through the injection port, so that the polyurethane sealant is evenly applied to the connection between the first air pipe, the second air pipe and the first sealing sleeve, thereby improving the sealing performance of the entire connection assembly. The polyurethane sealant can isolate the air, improve the sealing performance of the connection assembly, and prevent the sealing ring from contacting with the outside air, thereby accelerating the speed of oxidation damage of the sealing ring, and further improving the sealing effect of the natural gas pipeline sealing connection assembly. At the same time, by providing the connecting ring and the deformation groove, the characteristics of the threaded connection between the locking threaded sleeve and the connecting ring can be utilized to realize the fixation of the first sealing sleeve and the first air pipe and the second air pipe, and at the same time, the expansion and contraction effect of the damping spring is utilized to make the sealing baffle fit and connect with the liquid injection port, so that the sealing baffle can only move toward the inner side of the first sealing sleeve to realize the outflow of the polyurethane sealant. When the polyurethane sealant flows over the entire connection between the first sealing sleeve and the first air pipe and the second air pipe, the polyurethane sealant will squeeze the sealing baffle, so that the sealing baffle fits with the liquid injection port, the liquid injection port is blocked, and the polyurethane sealant is prevented from flowing back into the liquid injection cavity, thereby causing damage to the remaining polyurethane sealant.

[0021] 2. By setting up the second sealing mechanism, not only can the rotation of the translation threaded rod be realized by utilizing the meshing action between the meshing tooth groove and the meshing gear through the rotating gear, but also the translation threaded sleeve can drive the translation bracket and the sealing ring to slide inside the connecting sliding tube, so that the sealing ring is fitted and connected with the ends of the first air pipe and the second air pipe, thereby further improving the sealing performance of the natural gas pipeline sealing connection assembly. At the same time, utilizing the characteristic of the sealing ring sliding inside the connecting sliding tube, the first air pipe and the second air pipe of different lengths can be connected. When repairing the natural gas pipeline sealing connection assembly or replacing the sealing ring, the space inside the connecting sliding tube can be utilized to slide the first air pipe and the second air pipe, thereby facilitating the installation of the natural gas pipeline sealing connection assembly to the connecting portion of the first air pipe and the second air pipe. At the same time, when the first air pipe and the second air pipe are damaged and cut to be shorter, there is no need to weld the first air pipe and the second air pipe, so the connection of the first air pipe and the second air pipe can be realized, making the natural gas pipeline sealing connection assembly more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the first sealing mechanism in the present invention;

[0024] Figure 3 It is a schematic diagram of the exploded three-dimensional structure of the first sealing mechanism in the present invention;

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the cross section of the first sealing sleeve in the present invention;

[0026] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of the middle A area;

[0027] Figure 6 For the present invention Figure 4 Schematic diagram of the enlarged structure of the middle B area;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the second sealing mechanism in the present invention;

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of the cross section of the connecting sliding pipe in the present invention;

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the rotating gear in the present invention;

[0031] Fig.10 It is a schematic diagram of the three-dimensional structure of the translation thread sleeve in the present invention.

[0032] In the figure: 1, first sealing mechanism; 101, first sealing sleeve; 102, first through hole; 103, first limiting protrusion; 104, injection cavity; 105, injection port; 106, damping telescopic rod; 107, damping spring; 108, sealing baffle; 109, sealing threaded sleeve; 110, injection threaded rod; 111, injection piston; 112, injection knob; 113, connecting ring; 114, deformation groove; 115 , connecting thread; 116, locking thread sleeve; 117, locking ring; 2, second sealing mechanism; 201, sealing connecting pipe; 202, connecting sliding pipe; 203, connecting slide groove; 204, first air pipe; 205, second air pipe; 206, rotating gear; 207, meshing tooth groove; 208, meshing gear; 209, translation thread rod; 210, translation thread sleeve; 211, translation bracket; 212, sealing ring. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-10The present invention provides a technical solution: a natural gas pipeline sealing connection assembly, comprising a first sealing mechanism 1, and a connecting ring 113 installed on one side of the first sealing mechanism 1, a second sealing mechanism 2 is arranged inside the first sealing mechanism 1, and a first air pipe 204 and a second air pipe 205 are arranged inside the second sealing mechanism 2, the first sealing mechanism 1 comprises a first sealing sleeve 101, a first through hole 102 is opened inside the first sealing sleeve 101, a first limiting protrusion 103 is fixedly installed on one side of the first through hole 102, wherein a liquid injection cavity 104 is opened around the inside of the first sealing sleeve 101, and a liquid injection cavity 104 is opened on one side of the end of the liquid injection cavity 104 The liquid injection cavity 104 has a damping telescopic rod 106 fixedly connected to one end thereof near the liquid injection cavity 105, a damping spring 107 is slidably connected to the outer side of the damping telescopic rod 106, a sealing baffle 108 is fixedly connected to the bottom of the damping spring 107, a sealing threaded sleeve 109 is fixedly installed at one end of the liquid injection cavity 104 away from the liquid injection cavity 105, a liquid injection threaded rod 110 is connected to the inner thread of the sealing threaded sleeve 109, one end of the liquid injection threaded rod 110 is fixedly connected to the liquid injection piston 111, and one end of the liquid injection threaded rod 110 away from the liquid injection piston 111 is fixedly connected to the liquid injection knob 112. By setting the first sealing mechanism 1, not only the liquid injection knob 112 can be used to adjust the liquid injection knob 112, but also the liquid injection knob 112 can be used to adjust the liquid injection knob 112. 2 drives the injection threaded rod 110 to rotate inside the sealing threaded sleeve 109, so that the injection threaded rod 110 pushes the injection piston 111 to slide inside the injection chamber 104, thereby injecting the polyurethane sealant inside the injection chamber 104 into the first sealing sleeve 101 through the injection port 105, so that the polyurethane sealant is evenly applied to the connection between the first air pipe 204, the second air pipe 205 and the first sealing sleeve 101, thereby improving the sealing performance of the entire connection component. The polyurethane sealant can isolate the air, improve the sealing performance of the connection component, and prevent the sealing ring 212 from contacting with the outside air, thereby accelerating the speed of oxidation damage of the sealing ring 212, further improving The sealing effect of the high natural gas pipeline sealing connection component is improved, and the expansion and contraction effect of the damping spring 107 is utilized to make the sealing baffle 108 fit and connect with the injection port 105, so that the sealing baffle 108 can only move toward the inner side of the first sealing sleeve 101 to realize the outflow of the polyurethane sealant. When the polyurethane sealant flows over the connection between the entire first sealing sleeve 101 and the first air pipe 204 and the second air pipe 205, the polyurethane sealant will squeeze the sealing baffle 108, so that the sealing baffle 108 fits with the injection port 105, and the injection port 105 is blocked to prevent the polyurethane sealant from flowing back into the injection cavity 104, thereby causing damage to the remaining polyurethane sealant.

[0035] The connecting ring 113 is fixedly mounted on one end of the first sealing sleeve 101 close to the first limiting protrusion 103, a plurality of deformation grooves 114 are provided inside the connecting ring 113, a connecting thread 115 is provided on the outside of the connecting ring 113, a locking thread sleeve 116 is threadedly connected to the outside of the connecting ring 113, a locking ring 117 is fixedly mounted on the outside of the end of the locking thread sleeve 116, the first sealing sleeve 101 is threadedly connected to the connecting sliding tube 202, and the injection piston 111 is connected to the first sealing sleeve 101 through the injection cavity 104. The sealing sleeve 101 is slidably connected, the damping telescopic rod 106 is fitly connected to the sealing baffle 108, the sealing baffle 108 is fitly connected to the injection port 105, the first sealing sleeve 101 and the connecting ring 113 are both sleeved on the outside of the first air pipe 204 and the second air pipe 205, and by setting the connecting ring 113 and the deformation groove 114, the locking threaded sleeve 116 and the connecting ring 113 can be threadedly connected to achieve the fixation of the first sealing sleeve 101 and the first air pipe 204 and the second air pipe 205.

[0036] The second sealing mechanism 2 includes a sealing connection tube 201, and connecting sliding tubes 202 are symmetrically installed at both ends of the sealing connection tube 201. Connecting sliding grooves 203 are opened around the inner side of the connecting sliding tube 202. The first air pipe 204 and the second air pipe 205 are respectively installed inside the connecting sliding tube 202. Rotating gears 206 are symmetrically installed at both ends of the sealing connection tube 201. Meshing tooth grooves 207 are opened on the inner side of the rotating gear 206. Meshing gears 208 are meshed and connected around the inner side of the meshing tooth groove 207. A translation threaded rod 209 is fixedly connected to one side of the meshing gear 208. The middle part of the translation threaded rod 209 is threadedly connected to a translation threaded sleeve. 210, a translation bracket 211 is fixedly connected between the translation threaded sleeve 210, a sealing ring 212 is fixedly connected to the outer side of the translation bracket 211, the first air pipe 204 and the second air pipe 205 are respectively slidably connected to the connecting sliding pipe 202, the rotating gear 206 is respectively rotatably connected to the sealing connecting pipe 201 and the connecting sliding pipe 202, the meshing gear 208 is rotatably connected to the connecting sliding pipe 202, the translation threaded sleeve 210 is slidably connected to the connecting sliding pipe 202 through the connecting slide groove 203, the translation bracket 211 and the sealing ring 212 are both fitted and connected to the inner wall of the connecting sliding pipe 202, and the sealing ring 212 is connected to the first air pipe 204 and the second air pipe 205. The ends of the gas pipe 205 are fitted and connected. By setting the second sealing mechanism 2, not only can the rotation of the translation threaded rod 209 be realized by rotating the rotating gear 206 and utilizing the meshing action between the meshing tooth groove 207 and the meshing gear 208, but also the translation threaded sleeve 210 drives the translation bracket 211 and the sealing ring 212 to slide inside the connecting sliding pipe 202, so that the sealing ring 212 is fitted and connected with the ends of the first gas pipe 204 and the second gas pipe 205, so as to further improve the sealing performance of the natural gas pipeline sealing connection assembly. At the same time, by utilizing the characteristic that the sealing ring 212 slides inside the connecting sliding pipe 202, the first gas pipes 204 of different lengths can be connected. When the natural gas pipeline sealing connection assembly is repaired or the sealing ring 212 is replaced, the space inside the connecting sliding tube 202 can be used to slide the first air pipe 204 and the second air pipe 205, thereby facilitating the installation of the natural gas pipeline sealing connection assembly to the connection portion of the first air pipe 204 and the second air pipe 205. At the same time, when the first air pipe 204 and the second air pipe 205 are damaged and cut shorter, there is no need to weld the first air pipe 204 and the second air pipe 205, and the connection between the first air pipe 204 and the second air pipe 205 can be achieved, making the natural gas pipeline sealing connection assembly more convenient to use.

[0037] Working principle: Before using this natural gas pipeline sealing connection component, you need to check the overall condition of the device to make sure it can work normally. Figure 1 - Fig.10As shown, when connecting the gas pipeline, first, the first gas pipe 204 and the second gas pipe 205 are respectively inserted into the interior of the connecting sliding pipe 202, and the first sealing sleeve 101 is threadedly installed on the end of the connecting sliding pipe 202. At the same time, the locking ring 117 is rotated to drive the locking threaded sleeve 116 to be threadedly connected with the connecting ring 113, and the deformation groove 114 is used to realize the extrusion deformation of the connecting ring 113, and the first gas pipe 204 and the second gas pipe 205 are pressed to improve the connection stability of the first gas pipe 204 and the second gas pipe 205 and the connecting component. Secondly, by rotating the rotating gear 206 and utilizing the meshing action between the meshing tooth groove 207 and the meshing gear 208, the rotation of the translation threaded rod 209 is realized, so that the translation threaded sleeve 210 drives the translation bracket 211 and the sealing ring 212 to slide inside the connecting sliding pipe 202, so that the sealing ring 212 is fitted and connected with the ends of the first gas pipe 204 and the second gas pipe 205, further improving the sealing of the natural gas pipeline. The sealing performance of the connection component is improved. At the same time, the sealing ring 212 slides inside the connecting sliding tube 202, so that the first air pipe 204 and the second air pipe 205 of different lengths can be connected. Finally, by turning the injection knob 112, the injection threaded rod 110 is driven to rotate inside the sealing threaded sleeve 109, so that the injection threaded rod 110 pushes the injection piston 111 to slide inside the injection chamber 104, thereby injecting the polyurethane sealant inside the injection chamber 104 into the first sealing sleeve 101 through the injection port 105, so that the polyurethane sealant is evenly applied to the connection between the first air pipe 204, the second air pipe 205 and the first sealing sleeve 101, thereby improving the sealing performance of the entire connection component. The polyurethane sealant can isolate the air, improve the sealing performance of the connection component, and prevent the sealing ring 212 from contacting with the outside air, thereby accelerating the oxidation damage rate of the sealing ring 212, and further improving the sealing effect of the natural gas pipeline sealing connection component.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A natural gas pipeline sealing connection assembly, comprising a first sealing mechanism (1), and a connecting ring (113) installed on one side of the first sealing mechanism (1); A second sealing mechanism (2) is arranged inside the first sealing mechanism (1), and a first air pipe (204) and a second air pipe (205) are respectively arranged inside the second sealing mechanism (2); It is characterized in that Also includes: The first sealing mechanism (1) comprises a first sealing sleeve (101), a first through hole (102) is provided inside the first sealing sleeve (101), and a first limiting protrusion (103) is fixedly mounted on one side of the inside of the first through hole (102); A liquid injection cavity (104) is provided around the interior of the first sealing sleeve (101), and a liquid injection port (105) is provided at one side of the end of the liquid injection cavity (104); A damping telescopic rod (106) is fixedly connected to one end of the liquid injection cavity (104) close to the liquid injection port (105), and a damping spring (107) is slidably connected to the outer side of the damping telescopic rod (106); A sealing baffle (108) is fixedly connected to the bottom of the damping spring (107); a sealing threaded sleeve (109) is fixedly installed at one end of the injection cavity (104) away from the injection port (105); an injection threaded rod (110) is internally threadedly connected to the sealing threaded sleeve (109); one end of the injection threaded rod (110) is fixedly connected to an injection piston (111); and one end of the injection threaded rod (110) away from the injection piston (111) is fixedly connected to an injection knob (112); The connecting ring (113) is fixedly mounted on one end of the first sealing sleeve (101) close to the first limiting protrusion (103); a plurality of deformation grooves (114) are provided inside the connecting ring (113); a connecting thread (115) is provided on the outside of the connecting ring (113); a locking thread sleeve (116) is connected to the outer thread of the connecting ring (113); and a locking ring (117) is fixedly mounted on the outer side of the end of the locking thread sleeve (116); The second sealing mechanism (2) comprises a sealing connection tube (201), connecting sliding tubes (202) are symmetrically mounted at both ends of the sealing connection tube (201), connecting sliding grooves (203) are provided around the inner side of the connecting sliding tube (202), the first air pipe (204) and the second air pipe (205) are respectively mounted inside the connecting sliding tube (202), and rotating gears (206) are symmetrically mounted at both ends of the sealing connection tube (201); A meshing tooth groove (207) is provided on the inner side of the rotating gear (206), a meshing gear (208) is meshingly connected to the inner side of the meshing tooth groove (207), a translation thread rod (209) is fixedly connected to one side of the meshing gear (208), a translation thread sleeve (210) is threadedly connected to the middle of the translation thread rod (209), a translation bracket (211) is fixedly connected between the translation thread sleeves (210), and a sealing ring (212) is fixedly connected to the outer side of the translation bracket (211); The first air pipe (204) and the second air pipe (205) are respectively slidably connected to the connecting sliding pipe (202); the rotating gear (206) is respectively slidably connected to the sealing connecting pipe (201) and the connecting sliding pipe (202); the meshing gear (208) is slidably connected to the connecting sliding pipe (202); the translation threaded sleeve (210) is slidably connected to the connecting sliding pipe (202) via the connecting sliding groove (203); the translation bracket (211) and the sealing ring (212) are both fitted and connected to the inner wall of the connecting sliding pipe (202); and the sealing ring (212) is fitted and connected to the ends of the first air pipe (204) and the second air pipe (205).

2. A natural gas pipeline sealing connection assembly according to claim 1, characterized in that: The first sealing sleeve (101) is threadedly connected to the connecting sliding tube (202); the injection piston (111) is slidably connected to the first sealing sleeve (101) via the injection chamber (104); the damping telescopic rod (106) is fittedly connected to the sealing baffle (108); the sealing baffle (108) is fittedly connected to the injection port (105); and the first sealing sleeve (101) and the connecting ring (113) are both sleeved on the outside of the first air pipe (204) and the second air pipe (205).

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