A double-wall pipe outer pipe pressure sealing auxiliary device

Abstract

The present invention relates to the technical field of pipeline sealing pressure-pressing auxiliary tools, and specifically to a double-walled tube outer tube pressure-sealing auxiliary device, characterized in that the sealing auxiliary device consists of a sealing flange, a movable flange, an outer tube retaining ring, an outer tube sealing ring, an inner tube locking pressure ring, an inner tube sealing ring, a clamping bolt, a locking bolt and a locking nut. An annular clamping groove is arranged on the side of the sealing flange outside the inner tube locking pressure ring, and a pressure-pressing device interface is arranged on the sealing flange. The inner tube locking pressure ring initially locks the inner tube sealing ring on the inner tube, and then the sealing flange is pulled toward the outer tube by the locking bolt so that the end of the outer tube is inserted into the annular clamping groove to realize the sealing between the inner tube and the outer tube, and then the inner tube locking pressure ring is pressed on the sealing flange by the locking clamping bolt so as to press the inner tube sealing ring and lock it on the outer wall of the inner tube. The present invention has the advantages of less welding on the outer tube, repeated use of the device, saving construction time, being economical and practical, and reducing the cost of test tooling.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline sealing pressure auxiliary tools, and specifically to a double-walled pipe outer pipe pressure sealing auxiliary device which has a simple structure, is easy to operate, requires less outer pipe welding, can be reused, saves construction time, is economical and practical, and reduces test tooling costs. Background Art

[0002] As we all know, natural gas needs to be transported using double-layer pipes. The inner and outer pipes of adjacent pipelines are connected by butt welding. Thin-walled stainless steel pipes are used for all pipelines. After the adjacent pipelines are connected, the outer pipe tightness test requires the annular cavity between the inner and outer pipes to be welded and sealed with a ring, or the inner pipe is sealed with a blind plate and the outer pipe is sealed with a pipe cap. Both of the above methods require welding on the inner and outer pipes. After the test, the tooling needs to be removed, and the inner and outer pipes are damaged to varying degrees. In particular, the inner pipe is used as a natural gas transmission pipeline. Damage to the inner pipe directly affects the progress of the project and its later service life, consumes and wastes a lot of manpower, material and financial resources, and poses engineering risks. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art and to provide a double-walled pipe outer pipe pressure sealing auxiliary device which has a simple structure, is easy to operate, requires less outer pipe welding, can be reused, saves construction time, is economical and practical, and reduces the cost of test tooling.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] The invention relates to a double-walled tube outer tube pressure sealing auxiliary device, characterized in that the sealing auxiliary device is composed of a sealing flange, a movable flange, an outer tube retaining ring, an outer tube sealing ring, an inner tube locking pressure ring, an inner tube sealing ring, a clamping bolt, a locking bolt and a locking nut. The right side of the inner ring of the sealing flange is provided with an annular groove, and the inner tube sealing ring is provided in the annular groove. The sealing flange on the left side of the inner tube sealing ring is provided with an inner tube locking pressure ring, and the inner tube locking pressure ring is provided with a threaded hole. A through hole is provided on the sealing flange outside the annular groove corresponding to the threaded hole, and the clamping bolt passes through the through hole and is connected with the threaded hole so that the clamping bolt drives the inner tube locking pressure ring to be pressed on the side of the sealing flange. The side of the sealing flange outside the inner tube locking pressure ring is provided with an annular clamping groove. An outer tube sealing ring is provided inside, and bolt through holes are evenly distributed on the circumference of the sealing flange outside the annular clamping groove. Locking bolts are provided in the bolt through holes, and the locking bolts are sequentially passed through the bolt through holes of the sealing flange and the bolt through holes provided on the movable flange to be connected with the locking nuts. An annular outer tube retaining ring is provided on the right side of the movable flange, and the outer tube retaining ring is connected to the outer tube by spot welding. A pressing device interface is provided on the sealing flange, and the inner tube locking pressure ring initially locks the inner tube sealing ring on the inner tube, and then the sealing flange is pulled toward the outer tube by the locking bolt, so that the end of the outer tube is inserted into the annular clamping groove to realize the sealing between the inner tube and the outer tube, and then the inner tube locking pressure ring is pressed on the sealing flange by the locking pressure bolt, so as to press the inner tube sealing ring and lock it on the outer wall of the inner tube.

[0006] The volume of the inner tube sealing ring of the present invention is larger than the volume between the annular groove of the sealing flange and the inner tube locking ring, ensuring that the inner tube sealing ring extends out of the groove of the sealing flange under the extrusion of the inner tube sealing locking ring and is tightly pressed against the outer wall of the inner tube.

[0007] An air pressure locking gap is provided between the inner tube locking ring and the inner tube of the present invention. The width of the air pressure locking gap is 0.1-1 cm. The air pressure locking gap allows the air pressure to press the inner tube sealing ring during the pressing process, thereby further achieving sealing and locking of the inner tube.

[0008] The annular groove of the present invention is arranged to be inclined with an inclination angle of 20-45 degrees, so that the inner tube sealing ring can press the outer wall of the inner tube downward during the process of being squeezed by the gas.

[0009] The inner diameter of the inner tube locking ring of the present invention is larger than the inner diameter of the annular groove and smaller than the outer diameter of the annular groove, so as to ensure that the air pressure enters from below the inner tube sealing ring to press the inner tube sealing ring.

[0010] The inner tube sealing ring described in the present invention is composed of an elastic outer sleeve and an internal guide and clamping ring. The elastic outer sleeve wraps the internal guide and clamping ring. The internal guide and clamping ring is a guide structure with a quadrilateral cross-section composed of an upper plate, a lower plate, a left plate and a right plate connected to each other. The left plate is in a vertical direction, and the right plate and the lower plate are inclined toward the lower left side. The internal guide and clamping ring as a whole moves toward the lower right side.

[0011] The inner right end of the inner tube sealing ring described in the present invention is provided with a convex lip portion, and the convex lip portion is set as an integral structure with the elastic outer sleeve of the inner tube sealing ring. A pre-tightening spring is sleeved on the outer side of the convex lip portion, and the pre-tightening spring ensures that the inner tube sealing ring is initially pressed against the outer wall of the inner tube.

[0012] The through hole on the sealing flange of the present invention is configured as a countersunk hole, a sealing gasket is arranged in the countersunk hole, a clamping bolt passes through the countersunk hole and clamps the sealing gasket, and sealing between the clamping bolt and the sealing flange is achieved through the sealing gasket.

[0013] The closure of the present invention is a kind of sealing device, and the closure of the present invention is a kind of sealing device, and the closure of the present invention is a kind of sealing device, and the closure of the present invention is a kind of sealing device, and the closure of the present invention is a kind of sealing device, and the closure of the present invention is a kind of sealing device, and the closure of the present invention is a kind of sealing device, and the closure of the present invention is a kind of sealing device, and the closure of the present invention is a kind of sealing device. The bolt passes through the hole and the bolt passes through the hole on the movable flange and is connected with the locking nut. The right side of the movable flange is provided with an annular outer tube retaining ring, and the outer tube retaining ring is connected to the outer tube by spot welding. The sealing flange is provided with a pressure device interface, and the inner tube locking pressure ring initially locks the inner tube sealing ring on the inner tube, and then pulls the sealing flange toward the outer tube by the locking bolt, so that the outer tube end is inserted into the annular clamping groove to achieve the seal between the inner tube and the outer tube, and then presses the inner tube locking pressure ring on the sealing flange by the locking pressure bolt, thereby pressurizing the inner tube sealing ring and locking it on the outer wall of the inner tube. The volume of the inner tube sealing ring is larger than the volume between the annular groove of the sealing flange and the inner tube locking pressure ring. It is ensured that the inner tube sealing ring extends out of the groove of the sealing flange under the extrusion of the inner tube sealing locking ring and is tightly pressed on the outer wall of the inner tube. An air pressure locking gap is provided between the inner tube locking pressure ring and the inner tube, and the width of the air pressure locking gap is 0.1-1cm, the air pressure locking gap is used to press the inner tube sealing ring during the pressing process, so as to further realize the sealing and locking of the inner tube, the annular groove is set to an inclined shape, and the inclination angle is 20-45 degrees, so that the inner tube sealing ring presses the outer wall of the inner tube downward during the gas squeezing process, and the inner diameter of the inner tube locking pressure ring is larger than the inner diameter of the annular groove and smaller than the outer diameter of the annular groove, so as to ensure that the air pressure enters from the bottom of the inner tube sealing ring to press the inner tube sealing ring, the inner tube sealing ring is composed of an elastic outer sleeve and an internal guide pressing ring, the elastic outer sleeve wraps the internal guide pressing ring, the internal guide pressing ring is composed of an upper plate, a lower plate, a left plate and a right plate connected to each other to form a quadrilateral guide structure, and the left plate is vertical In the vertical direction, the right side plate and the lower plate are inclined toward the lower left side, and the internal guide clamping ring is tilted and moved toward the lower right side as a whole. The inner right end of the inner tube sealing ring is provided with a convex lip, and the convex lip is set as an integral structure with the elastic outer sleeve of the inner tube sealing ring. The outer side of the convex lip is sleeved with a preload spring, and the preload spring ensures that the inner tube sealing ring is initially pressed on the outer wall of the inner tube. The through hole provided on the sealing flange is set as a countersunk hole, and a sealing gasket is provided in the countersunk hole. The clamping bolt passes through the countersunk hole and compresses the sealing gasket. The sealing between the clamping bolt and the sealing flange is achieved by the sealing gasket. It has the advantages of simple structure, convenient operation, less welding of the outer tube, repeated use of the device, saving construction time, economical and practical, and reducing the cost of test tooling. . BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention.

[0015] Figure 2 yes Figure 1 sectional view of .

[0016] Figure 3 It is a partial enlarged view of the connection between the inner tube wall and the sealing flange in the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings:

[0018] As shown in the accompanying drawings, a double-walled tube outer tube pressure sealing auxiliary device is characterized in that the sealing auxiliary device consists of a sealing flange 1, a movable flange 2, an outer tube retaining ring 3, an outer tube sealing ring 4, an inner tube locking pressure ring 5, an inner tube sealing ring 6, a clamping bolt 7, a locking bolt 8 and a locking nut 9. The right side of the inner ring of the sealing flange 1 is provided with an annular groove 10, and the inner tube sealing ring 6 is provided in the annular groove 10. The inner tube locking pressure ring 5 is provided on the sealing flange 1 on the left side of the inner tube sealing ring 6, and the inner tube locking pressure ring 5 is provided with a threaded hole A through hole is provided on the sealing flange 1 on the outside of the annular groove 10 corresponding to the threaded hole, and a clamping bolt 7 passes through the through hole to be connected with the threaded hole, so that the clamping bolt 7 drives the inner tube locking ring 5 to be pressed on the side of the sealing flange 1. An annular clamping groove 11 is provided on the side of the sealing flange 1 on the outside of the inner tube locking ring 5, and an outer tube sealing ring 4 is arranged in the annular clamping groove 11. Bolt through holes are evenly distributed on the circumference of the sealing flange 1 on the outside of the annular clamping groove 11. Locking bolts 8 are arranged in the bolt through holes. The locking bolts 8 pass through the sealing flange 1 in sequence. The bolt through hole of the sealing flange 1 and the bolt through hole provided on the movable flange 2 are connected with the locking nut 9. The right side of the movable flange 2 is provided with an annular outer tube retaining ring 3, and the outer tube retaining ring 3 is connected to the outer tube 18 by spot welding. The sealing flange 1 is provided with a pressure device interface 12, and the inner tube locking pressure ring 5 initially locks the inner tube sealing ring 6 on the inner tube 19, and then the sealing flange 1 is pulled toward the outer tube 18 by the locking bolt 8, so that the end of the outer tube 18 is inserted into the annular clamping groove 11 to achieve the sealing between the inner tube 19 and the outer tube 18 , and then the inner tube locking ring 5 is pressed on the sealing flange 1 by locking the clamping bolt 7, and then the inner tube sealing ring 6 is pressed and locked on the outer wall of the inner tube 19. The volume of the inner tube sealing ring 6 is larger than the volume between the annular groove 10 of the sealing flange 1 and the inner tube locking ring 5, ensuring that the inner tube sealing ring 6 extends out of the groove of the sealing flange 1 under the extrusion of the inner tube 19 sealing locking ring and is tightly pressed on the outer wall of the inner tube 19. A gas pressure locking gap 13 is provided between the inner tube locking ring 5 and the inner tube 19, and the width of the gas pressure locking gap 13 is 0.1-1cm, the air pressure locking gap 13 is used to press the inner tube sealing ring 6 during the pressing process, and further realize the sealing and locking of the inner tube 19. The annular groove 10 is set to an inclined shape with an inclination angle of 20-45 degrees, so that the inner tube sealing ring 6 presses the outer wall of the inner tube 19 downward during the gas extrusion process. The inner diameter of the inner tube locking pressure ring 5 is larger than the inner diameter of the annular groove 10 and smaller than the outer diameter of the annular groove 10, ensuring that the air pressure enters from the bottom of the inner tube sealing ring 6 to press the inner tube sealing ring 6. The inner tube sealing ring 6 is composed of an elastic outer sleeve 14 and an internal guide pressing ring 15. The elastic outer sleeve 14 wraps the internal guide pressing ring 15. The internal guide pressing ring 15 is composed of an upper plate, a lower plate, a left plate and a right plate. The guide structure with a quadrilateral cross section is connected, the left side plate is vertical, the right side plate and the lower plate are inclined toward the left and lower sides, the internal guide clamping ring 15 is tilted and moved toward the right and lower sides as a whole, the inner right end of the inner tube sealing ring 6 is provided with a lip portion 16, the lip portion 16 is set as an integral structure with the elastic jacket 14 of the inner tube sealing ring 6, the outer side of the lip portion 16 is sleeved with a preload spring 17, and the preload spring 17 ensures that the inner tube sealing ring 6 is initially pressed on the outer wall of the inner tube 19, the through hole provided on the sealing flange 1 is set as a countersunk hole, and a sealing gasket 20 is provided in the countersunk hole, and the clamping bolt 7 passes through the countersunk hole and compresses the sealing gasket 20, and the sealing between the clamping bolt 7 and the sealing flange 1 is achieved by the sealing gasket 20. .

[0019] When the present invention is in use, since the inner tube 19 partially extends out of the outer tube 18, the preload spring 17 is firstly sleeved on the convex lip 16 of the inner tube sealing ring 6 during the installation of the sealing auxiliary device, and then the inner tube sealing ring 6 and the inner tube locking pressure ring 5 are preliminarily installed on the sealing flange 1, and then the sealing flange 1, the inner tube sealing ring 6 and the inner tube locking pressure ring 5 are integrally sleeved on the inner tube 19, and then the movable flange 2 is sleeved on the outer wall of the outer tube 18, and then the outer tube retaining ring 3 is sleeved on the tube wall of the outer tube 18, and the outer tube retaining ring 3 is welded to the outer wall of the outer tube 18 by spot welding, and then the locking bolt 8 is sequentially passed through the sealing flange 1 and the movable flange 2 and locked by the locking nut 9, and in the process of locking the locking nut 9, the sealing flange 1 is pulled with the inner tube sealing ring 6 The inner tube 18 is moved together with the inner tube locking ring 5 toward the end of the outer tube 18, and then the end of the outer tube 18 is inserted into the annular clamping groove 11 of the sealing flange 1, and the outer tube 18 is sealed by the outer tube sealing ring 4, and finally the sealing between the inner tube 19 and the outer tube 18 is achieved, and then the inner tube sealing ring 6 is locked on the side wall of the sealing flange 1 by locking the clamping bolt 7, and then the inner tube sealing ring 6 is clamped on the outer wall of the inner tube 19, so as to achieve the preliminary sealing of the inner tube 19, and then the pressure test is carried out through the pressure device interface 12 on the sealing flange 1. Due to the pressure of the gas in the tube, the gas enters the inner tube sealing ring 6 through the gas pressure locking gap 13. Due to the inclination of the annular groove 10, the inner tube sealing ring 6 is pressed at the groove to deform, and then squeezed inside again. On the outer wall of the tube 19, sealing is further achieved. After use, the sealing auxiliary device can be disassembled, the outer tube retaining ring 3 can be removed, the welding point can be polished, and then the entire device can be dismantled. The sealing auxiliary device of the present invention is composed of a sealing flange 1, a movable flange 2, an outer tube retaining ring 3, an outer tube sealing ring 4, an inner tube locking pressure ring 5, an inner tube sealing ring 6, a clamping bolt 7, a locking bolt 8 and a locking nut 9. The right side of the inner ring of the sealing flange 1 is provided with an annular groove 10, and an inner tube sealing ring 6 is arranged in the annular groove 10. The sealing flange 1 on the left side of the inner tube sealing ring 6 is provided with an inner tube locking pressure ring 5, and a threaded hole is provided on the inner tube locking pressure ring 5. A through hole is provided on the sealing flange 1 outside the annular groove 10 corresponding to the threaded hole , the clamping bolt 7 passes through the through hole and is connected with the threaded hole, so that the clamping bolt 7 drives the inner tube locking ring 5 to be pressed on the side of the sealing flange 1. The side of the sealing flange 1 on the outer side of the inner tube locking ring 5 is provided with an annular clamping groove 11, and the outer tube sealing ring 4 is arranged in the annular clamping groove 11. Bolt through holes are evenly distributed on the circumference of the sealing flange 1 on the outer side of the annular clamping groove 11. The bolt through holes are provided with locking bolts 8. The locking bolts 8 pass through the bolt through holes of the sealing flange 1 and the bolt through holes on the movable flange 2 in turn and are connected with the locking nuts 9. The right side of the movable flange 2 is provided with an annular outer tube retaining ring 3, and the outer tube retaining ring 3 is connected to the outer tube 18 by spot welding. The sealing flange 1 is provided with a pressure device interface 12.The inner tube locking pressure ring 5 initially locks the inner tube sealing ring 6 on the inner tube 19, and then the sealing flange 1 is pulled toward the outer tube 18 by the locking bolt 8 so that the end of the outer tube 18 is inserted into the annular clamping groove 11 to achieve the sealing between the inner tube 19 and the outer tube 18, and then the inner tube locking pressure ring 5 is pressed on the sealing flange 1 by the locking and clamping bolts 7, so that the inner tube sealing ring 6 is pressed and locked on the outer wall of the inner tube 19. The volume of the inner tube sealing ring 6 is larger than the volume between the annular groove 10 of the sealing flange 1 and the inner tube locking pressure ring 5, ensuring that the inner tube sealing ring 6 extends out of the sealing flange under the extrusion of the inner tube 19 sealing locking ring. The groove of 1 is tightly pressed on the outer wall of the inner tube 19, and a gas pressure locking gap 13 is provided between the inner tube locking ring 5 and the inner tube 19. The width of the gas pressure locking gap 13 is 0.1-1 cm. The gas pressure presses the inner tube sealing ring 6 during the pressing process through the gas pressure locking gap 13, and further realizes the sealing and locking of the inner tube 19. The annular groove 10 is set to be inclined, and the inclination angle is 20-45 degrees, so that the inner tube sealing ring 6 presses the outer wall of the inner tube 19 downward during the gas squeezing process. The inner diameter of the inner tube locking ring 5 is larger than the inner diameter of the annular groove 10 and smaller than the outer diameter of the annular groove 10 , ensuring that the air pressure enters from the bottom of the inner tube sealing ring 6 to compress the inner tube sealing ring 6, the inner tube sealing ring 6 is composed of an elastic outer sleeve 14 and an internal guide clamping ring 15, the elastic outer sleeve 14 wraps the internal guide clamping ring 15, the internal guide clamping ring 15 is a guide structure with a quadrilateral cross section composed of an upper plate, a lower plate, a left plate and a right plate connected to each other, the left plate is in a vertical direction, the right plate and the lower plate are inclined toward the left lower side, the internal guide clamping ring 15 is tilted and moved toward the right lower side as a whole, and a convex lip portion 16 is provided at the inner right end of the inner side of the inner tube sealing ring 6, and the convex lip portion 16 6 is set as an integral structure with the elastic jacket 14 of the inner tube sealing ring 6, and the outer side of the convex lip 16 is sleeved with a preload spring 17, which ensures that the inner tube sealing ring 6 is initially pressed on the outer wall of the inner tube 19, and the through hole provided on the sealing flange 1 is set as a countersunk hole, and a sealing gasket 20 is provided in the countersunk hole. The clamping bolt 7 passes through the countersunk hole and compresses the sealing gasket 20, and the sealing between the clamping bolt 7 and the sealing flange 1 is achieved by the sealing gasket 20. It has the advantages of simple structure, convenient operation, less welding of the outer tube 18, repeated use of the device, saving construction time, economical and practical, and reducing the cost of test tooling. ,

Claims

1. A double-walled tube outer tube pressure sealing auxiliary device, characterized in that The sealing auxiliary device is composed of a sealing flange, a movable flange, an outer tube retaining ring, an outer tube sealing ring, an inner tube locking pressure ring, an inner tube sealing ring, a clamping bolt, a locking bolt and a locking nut. The right side of the inner ring of the sealing flange is provided with an annular groove, and the inner tube sealing ring is arranged in the annular groove. The sealing flange on the left side of the inner tube sealing ring is provided with an inner tube locking pressure ring, and a threaded hole is provided on the inner tube locking pressure ring. A through hole is provided on the sealing flange outside the annular groove corresponding to the threaded hole, and the clamping bolt passes through the through hole and is connected with the threaded hole, so that the clamping bolt drives the inner tube locking pressure ring to be pressed on the side of the sealing flange. The side of the sealing flange outside the inner tube locking pressure ring is provided with an annular clamping groove, and the outer tube sealing ring is arranged in the annular clamping groove. The circumference of the sealing flange on the outside of the shaped clamping groove is evenly distributed with bolt through holes, and locking bolts are arranged in the bolt through holes. The locking bolts pass through the bolt through holes of the sealing flange and the bolt through holes on the movable flange in turn and are connected with the locking nuts. The right side of the movable flange is provided with an annular outer tube retaining ring, and the outer tube retaining ring is connected to the outer tube by spot welding. The sealing flange is provided with a pressing device interface, and the inner tube locking pressure ring initially locks the inner tube sealing ring on the inner tube, and then the sealing flange is pulled toward the outer tube by the locking bolt so that the end of the outer tube is inserted into the annular clamping groove to realize the sealing between the inner tube and the outer tube, and then the inner tube locking pressure ring is pressed on the sealing flange by the locking pressure bolt, so that the inner tube sealing ring is pressurized and locked on the outer wall of the inner tube.

2. The double-walled pipe outer pipe pressure sealing auxiliary device according to claim 1, characterized in that The volume of the inner tube sealing ring is larger than the volume between the annular groove of the sealing flange and the inner tube locking pressure ring.

3. A double-walled pipe outer pipe pressure sealing auxiliary device according to claim 1 or 2, characterized in that An air pressure locking gap is provided between the inner tube locking ring and the inner tube, and the width of the air pressure locking gap is 0.1-1 cm. The air pressure can further press the inner tube sealing ring during the pressing process through the air pressure locking gap.

4. The double-walled pipe outer pipe pressure sealing auxiliary device according to claim 1, characterized in that The annular groove is set to be inclined, and the inclination angle is 20-45 degrees.

5. The double-walled pipe outer pipe pressure sealing auxiliary device according to claim 1, characterized in that The inner diameter of the inner tube locking ring is larger than the inner diameter of the annular groove and smaller than the outer diameter of the annular groove.

6. The double-walled pipe outer pipe pressure sealing auxiliary device according to claim 1, characterized in that The inner tube sealing ring is composed of an elastic outer sleeve and an internal guide clamping ring. The elastic outer sleeve wraps the internal guide clamping ring. The internal guide clamping ring is a guide structure with a quadrilateral cross-section composed of an upper plate, a lower plate, a left plate and a right plate connected to each other. The left plate is in a vertical direction, and the right plate and the lower plate are inclined toward the lower left side. The internal guide clamping ring as a whole moves tilted toward the lower right side.

7. The double-walled pipe outer pipe pressure sealing auxiliary device according to claim 1, characterized in that A convex lip is provided at the right inner end of the inner tube sealing ring. The convex lip is configured as an integral structure with the elastic outer sleeve of the inner tube sealing ring. A preload spring is sleeved on the outer side of the convex lip.

8. The double-walled pipe outer pipe pressure sealing auxiliary device according to claim 1, characterized in that The through hole on the sealing flange is set as a countersunk hole, a sealing gasket is arranged in the countersunk hole, and the clamping bolt penetrates into the countersunk hole and clamps the sealing gasket.

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