Natural gas pipeline connector sealing device

Abstract

The utility model discloses a natural gas pipeline interface sealing device, which relates to the field of pipeline sealing, and comprises a first gas pipeline and a second gas pipeline, one end of the first gas pipeline close to the second gas pipeline is fixedly sleeved with a positioning flange; the end, close to the first gas conveying pipeline, of the second gas conveying pipeline is sleeved with a sliding flange in a sliding mode, the sliding flange can move in the axial direction of the second gas conveying pipeline, a sealing ring is arranged between the sliding flange and the positioning flange, and the sliding flange is connected with the positioning flange through a bolt assembly. The sealing ring is in a compressed state through extrusion of the sliding flange and the positioning flange, due to the movable characteristic of the sliding flange, when the sealing ring or the sealing ring is replaced, a pipeline connected with the sealing ring or the sealing ring does not need to be disassembled, enough operation space can be obtained by loosening the bolt assembly and moving the sliding flange, and sealing parts can be conveniently and rapidly replaced. And the maintenance time and the labor cost are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the field of pipeline sealing, in particular to a natural gas pipeline interface sealing device. Background Art

[0002] In the energy supply system, natural gas, as a clean and efficient energy source, is crucial for its safe and stable transportation. Natural gas pipelines are the core carrier for long-distance natural gas transportation, and the sealing performance of pipeline interfaces is directly related to the safety and reliability of the entire transportation system.

[0003] Currently, traditional natural gas pipeline interface sealing devices mostly utilize simple flange connections with conventional sealing gaskets. Conventional sealing gaskets have limited material properties. After long-term exposure to the high pressure, low temperatures, and complex chemical media involved in natural gas transportation, they are prone to aging, deformation, and damage, leading to seal failure and natural gas leaks. Alternatively, flanges and sealing rings can be used to seal the connection between two pipelines. While this method provides effective sealing, the sealing rings can be subject to corrosion and wear over time due to media corrosion, pressure compression, and temperature fluctuations, compromising sealing performance. This necessitates replacement of the sealing rings. However, due to the fixed installation of the pipes between the two flanged connections, there is no relative movement, making replacement of the sealing rings extremely limited. Workers cannot directly remove the sealing rings without disassembling the pipes, often requiring the entire connected pipe to be disassembled. This disassembly method is not only time-consuming and labor-intensive, increasing maintenance costs and time expenditures, but frequent pipe disassembly can also damage the overall structure of the pipeline system, reducing its service life. In emergency repairs, the sealing rings cannot be quickly removed for repair, seriously impacting the continuity and stability of natural gas transportation. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a natural gas pipeline interface sealing device to solve the deficiencies of the prior art.

[0005] The purpose of the utility model is achieved through the following technical solutions: a natural gas pipeline interface sealing device, comprising a first gas pipeline and a second gas pipeline, wherein the first gas pipeline is provided with a positioning flange on a fixed sleeve at one end close to the second gas pipeline, and the second gas pipeline is provided with a sliding flange on a sliding sleeve at one end close to the first gas pipeline, wherein the sliding flange can move axially along the second gas pipeline, a sealing ring is provided between the sliding flange and the positioning flange, the sliding flange is connected to the positioning flange by a bolt assembly, and the sealing ring is in a compressed state by the extrusion of the sliding flange and the positioning flange.

[0006] Furthermore, a first annular groove is formed on the end surface of the sliding flange close to the positioning flange, and a second annular groove is formed on the end surface of the positioning flange close to the sliding flange. Both ends of the sealing ring are interference-fitted in the first annular groove and the second annular groove respectively.

[0007] Furthermore, a plurality of the bolt assemblies are evenly distributed along the circumferential direction of the positioning flange. The bolt assembly includes a screw and a nut. The tail of the screw passes through the positioning flange and the sliding flange in sequence to thread the nut.

[0008] Furthermore, a docking plate is fixedly provided at one end of the second gas pipeline close to the first gas pipeline. The docking plate is located between the sliding flange and the positioning flange. The outer diameter of the docking plate is smaller than the inner diameter of the sealing ring. The sliding flange and the docking plate abut against each other to form a sealing surface.

[0009] Furthermore, a third annular groove is formed on the end surface of the sliding flange close to the docking plate, and a fourth annular groove is formed on the end surface of the docking plate close to the sliding flange. Both ends of the sealing ring are interference fit in the third annular groove and the fourth annular groove respectively.

[0010] Furthermore, the sliding flange includes a flange plate and an abutment ring, the abutment ring is coaxially fixed to the flange plate, the sealing ring is squeezed between the abutment ring and the positioning flange, and the docking plate is fitted in the inner ring of the abutment ring.

[0011] Furthermore, a retaining ring is coaxially fixed to one end of the positioning flange close to the sliding flange. The outer diameter of the retaining ring is the same as the outer diameter of the positioning flange, and the sliding flange fits in the retaining ring.

[0012] Furthermore, a finger groove is provided on the end surface of the sliding flange away from the positioning flange.

[0013] The beneficial effects of the utility model are:

[0014] 1. Due to the movable nature of the sliding flange, when replacing the sealing ring or seal ring, there is no need to dismantle the connected pipe. By loosening the bolt assembly and moving the sliding flange, sufficient operating space can be obtained, allowing for convenient and quick replacement of sealing components. This greatly reduces maintenance time and labor costs, while avoiding damage to the system structure caused by frequent pipe disassembly, thereby increasing the overall service life of the pipeline system. In emergency repair situations, sealing components can be quickly replaced to ensure the continuity and stability of natural gas transportation.

[0015] 2. Both ends of the sealing ring are interference-fitted into the first annular groove and the second annular groove respectively. This structural design enables the sealing ring to fully fill the gap between the flanges when squeezed, forming a tight sealing surface and effectively preventing natural gas leakage; secondly, a sealing ring is also provided between the sliding flange and the docking plate, and both ends of the sealing ring are interference-fitted into the third annular groove and the fourth annular groove, which improves the sealing strength of the sliding flange moving position and forms a double sealing structure to fully seal the docking position of the first gas pipeline and the second gas pipeline, which not only improves the sealing reliability of the device, but also effectively resists the erosion of high pressure, low temperature and complex chemical media during the natural gas transportation process, extends the service life of the sealing components, and ensures the safe and stable transportation of natural gas in the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a natural gas pipeline interface sealing device of the present utility model;

[0017] Figure 2 This is a top view of a natural gas pipeline interface sealing device according to the present invention;

[0018] Figure 3 for Figure 2 Middle AA section view;

[0019] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0020] In the figure, 1-first gas pipeline, 2-second gas pipeline, 3-positioning flange, 4-sliding flange, 5-sealing ring, 6-first annular groove, 7-second annular groove, 8-screw, 9-nut, 10-docking plate, 11-third annular groove, 12-fourth annular groove, 13-sealing ring, 14-flange, 15-abutting ring, 16-retaining ring, 17-finger groove. DETAILED DESCRIPTION

[0021] Example 1

[0022] like Figures 1 to 4As shown, a natural gas pipeline interface sealing device includes a first gas pipeline 1 and a second gas pipeline 2. The first gas pipeline 1 is provided with a fixed sleeve with a positioning flange 3 at one end close to the second gas pipeline 2, and the second gas pipeline 2 is provided with a sliding sleeve with a sliding flange 4 at one end close to the first gas pipeline 1. The sliding flange 4 can move along the axial direction of the second gas pipeline 2. There is a sealing ring 5 between the sliding flange 4 and the positioning flange 3. The sliding flange 4 is connected to the positioning flange 3 through a bolt assembly. The sealing ring 5 is in a compressed state by the extrusion of the sliding flange 4 and the positioning flange 3. Compared with the traditional connection method of two fixed flanges, this solution sets the two flanges to be fixed and movable, namely the positioning flange 3 and the sliding flange 4, respectively. The sealing ring 5 can be replaced by moving the sliding flange 4 without removing the first gas pipeline 1 or the second gas pipeline 2 as a whole, which greatly reduces maintenance time and manpower. Labor cost; the specific replacement process of the sealing ring 5 is: remove the bolt assembly, unlock the connection between the sliding flange 4 and the positioning flange 3, and then move the sliding flange 4 away from the positioning flange 3, so that the positioning flange 3 and the sliding flange 4 are separated to form an operating space for replacing the sealing ring 5. The sealing ring 5 is not directly connected to the sliding flange 4 and the positioning flange 3, but is assembled between the sliding flange 4 and the positioning flange 3 by extrusion. After the sliding flange 4 is removed, the sealing ring 5 can be directly taken out, and then a new sealing ring 5 is installed. Finally, the sliding flange 4 and the positioning flange 3 are connected together again by the bolt assembly. Under the action of the bolt assembly, the sealing ring 5 is in a compressed state, so that the two end faces of the sealing ring 5 are respectively close to the sliding flange 4 and the positioning flange 3 to form high-strength sealing surfaces, thereby improving the connection sealing performance between the first gas pipeline 1 and the second gas pipeline 2, and effectively preventing natural gas leakage.

[0023] Furthermore, a finger groove 17 is formed on the end surface of the sliding flange 4 away from the positioning flange 3 , and the operator inserts his finger into the finger groove 17 to move the sliding flange 4 , thereby facilitating the movement of the sliding flange 4 and completing the rapid replacement of the sealing ring 5 .

[0024] Example 2

[0025] Due to the movable arrangement of the sliding flange 4, there is a gap between the inner ring of the sliding flange 4 and the outer wall of the second gas pipeline 2, and natural gas is easy to leak from the gap. Therefore, based on the embodiment 1, as shown in FIG. Figures 2 to 4As shown, a docking plate 10 is fixedly provided at one end of the second gas pipeline 2 close to the first gas pipeline 1. The docking plate 10 is located between the sliding flange 4 and the positioning flange 3. The outer diameter of the docking plate 10 is smaller than the inner diameter of the sealing ring 5. The sliding flange 4 and the docking plate 10 are pressed against each other to form a sealing surface. There is no gap between the inner circle of the docking plate 10 and the outer wall of the second gas pipeline 2. After the sliding flange 4 is pressed against the docking plate 10, the sealing between the sliding flange 4 and the second gas pipeline 2 can be achieved through the sealing surface between the sliding flange 4 and the docking plate 10, and the sealing between the sliding flange 4 and the positioning flange 3 is achieved through the sealing ring 5, thereby fully sealing the docking position of the first gas pipeline 1 and the second gas pipeline 2, with a good sealing effect.

[0026] Example 3

[0027] Based on the second embodiment, Figures 1 to 4 As shown, the end surface of the sliding flange 4 close to the positioning flange 3 is provided with a first annular groove 6, the end surface of the positioning flange 3 close to the sliding flange 4 is provided with a second annular groove 7, and the two ends of the sealing ring 5 are respectively interference fit in the first annular groove 6 and the second annular groove 7, the end surface of the sliding flange 4 close to the docking plate 10 is provided with a third annular groove 11, and the end surface of the docking plate 10 close to the sliding flange 4 is provided with a fourth annular groove 12, and the two ends of the sealing ring 13 are respectively interference fit in the third annular groove 11 and the fourth annular groove 12, and the radial width of the sealing ring 5 is smaller than the radial width of the first annular groove 6 and the radial width of the second annular groove 7, so that the two ends of the sealing ring 5 can be easily inserted into the first annular groove 6 and the second annular groove 7, but the axial direction of the sealing ring 5 is not large enough. The length is greater than the sum of the axial lengths of the first annular groove 6 and the second annular groove 7, so that when the sliding flange 4 contacts the positioning flange 3, the sealing ring 5 will be squeezed, so that the sealing ring 5 is compressed and interference fit in the sealing space formed by the first annular groove 6 and the second annular groove 7. Similarly, the sealing ring 13 is also interference fit in the sealing space formed by the third annular groove 11 and the fourth annular groove 12 in the same way, forming a double sealing structure to fully seal the docking position of the first gas pipeline and the second gas pipeline, which not only improves the sealing reliability of the device, but also effectively resists the erosion of high pressure, low temperature and complex chemical media during the natural gas transportation process, extends the service life of the sealing components, and ensures the safe and stable transportation of natural gas in the pipeline.

[0028] Example 4

[0029] Based on the third embodiment, Figures 1 to 4As shown, the sliding flange 4 includes a flange plate 14 and an abutment ring 15. The abutment ring 15 is coaxially fixed to the flange plate 14. The sealing ring 5 is squeezed between the abutment ring 15 and the positioning flange 3. The docking plate 10 is fitted on the inner ring of the abutment ring 15. Through the setting of the abutment ring 15, the abutment ring 15 can contact the positioning flange 3 to form a sealing surface, so that the sealing ring 5 can be completely assembled in the first annular groove 6 and the second annular groove 7, avoiding the sealing ring 5 from being exposed, thereby extending the service life of the sealing ring 5. Similarly, the flange plate 14 can directly contact the docking plate 10 to form a sealing surface, so that the sealing ring 13 is completely assembled in the third annular groove 11 and the fourth annular groove 12, thereby extending the service life of the sealing ring 13.

[0030] Example 5

[0031] Based on the fourth embodiment, Figures 1 to 4 As shown, a retaining ring 16 is coaxially fixed to one end of the positioning flange 3 close to the sliding flange 4. The outer diameter of the retaining ring 16 is the same as the outer diameter of the positioning flange 3. The sliding flange 4 fits in the retaining ring 16. The connection between the sliding flange 4 and the positioning flange 3 is protected in the retaining ring 16, thereby preventing rainwater from seeping into the sealing ring 5 and the sealing ring 13, further protecting the sealing ring 5 and the sealing ring 13, and extending their service life.

[0032] Example 6

[0033] Based on Example 5, Figure 1 As shown, multiple bolt assemblies are evenly distributed along the circumferential direction of the positioning flange 3, and the bolt assemblies include screws 8 and nuts 9. The tail of the screw 8 passes through the positioning flange 3 and the sliding flange 4 in turn to thread the nut 9. The positioning flange 3 and the sliding flange 4 are connected together through the cooperation of the screw 8 and the nut 9, which has a high connection strength and squeezes the sealing ring 5 and the sealing ring 13 to form a high-strength sealing surface, thereby improving the sealing performance at the connection between the first gas pipeline 1 and the second gas pipeline 2.

Claims

1. A natural gas pipeline interface sealing device, characterized in that: The invention comprises a first gas transmission pipeline (1) and a second gas transmission pipeline (2), wherein a fixed sleeve of one end of the first gas transmission pipeline (1) close to the second gas transmission pipeline (2) is provided with a positioning flange (3), and a sliding sleeve of one end of the second gas transmission pipeline (2) close to the first gas transmission pipeline (1) is provided with a sliding flange (4), wherein the sliding flange (4) can move along the axial direction of the second gas transmission pipeline (2), a sealing ring (5) is provided between the sliding flange (4) and the positioning flange (3), and the sliding flange (4) is connected to the positioning flange (3) by a bolt assembly, and the sealing ring (5) is in a compressed state by the extrusion of the sliding flange (4) and the positioning flange (3).

2. A natural gas pipeline interface sealing device according to claim 1, characterized in that: The sliding flange (4) is provided with a first annular groove (6) on the end surface close to the positioning flange (3), and the positioning flange (3) is provided with a second annular groove (7) on the end surface close to the sliding flange (4). Both ends of the sealing ring (5) are interference-fitted in the first annular groove (6) and the second annular groove (7), respectively.

3. A natural gas pipeline interface sealing device according to claim 1, characterized in that: A plurality of bolt assemblies are evenly distributed along the circumferential direction of the positioning flange (3), and the bolt assembly comprises a screw rod (8) and a nut (9). The tail of the screw rod (8) passes through the positioning flange (3) and the sliding flange (4) in sequence to threadably connect the nut (9).

4. A natural gas pipeline interface sealing device according to claim 1, characterized in that: A docking plate (10) is fixedly provided on one end of the second gas transmission pipeline (2) close to the first gas transmission pipeline (1). The docking plate (10) is located between the sliding flange (4) and the positioning flange (3). The outer diameter of the docking plate (10) is smaller than the inner diameter of the sealing ring (5). The sliding flange (4) and the docking plate (10) abut against each other to form a sealing surface.

5. A natural gas pipeline interface sealing device according to claim 4, characterized in that: The sliding flange (4) is provided with a third annular groove (11) on the end surface close to the docking plate (10), and the docking plate (10) is provided with a fourth annular groove (12) on the end surface close to the sliding flange (4). Both ends of the sealing ring (13) are interference-fitted in the third annular groove (11) and the fourth annular groove (12), respectively.

6. A natural gas pipeline interface sealing device according to claim 4, characterized in that: The sliding flange (4) comprises a flange plate (14) and an abutment ring (15), wherein the abutment ring (15) is coaxially fixed to the flange plate (14), the sealing ring (5) is squeezed between the abutment ring (15) and the positioning flange (3), and the docking plate (10) is fitted in the inner ring of the abutment ring (15).

7. A natural gas pipeline interface sealing device according to claim 1, characterized in that: A retaining ring (16) is coaxially fixed to one end of the positioning flange (3) close to the sliding flange (4); the outer diameter of the retaining ring (16) is the same as the outer diameter of the positioning flange (3), and the sliding flange (4) fits inside the retaining ring (16).

8. A natural gas pipeline interface sealing device according to claim 7, characterized in that: A finger groove (17) is provided on the end surface of the sliding flange (4) away from the positioning flange (3).

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