Pipeline double-seal stop valve structure

Abstract

The invention provides a pipeline double-seal stop valve structure, which belongs to the technical field of stop valves, and comprises a valve body and a screw rod arranged on the valve body, and the upper end of the valve body is provided with a sealing port. Compared with conventional single-side sealing, the two valve clacks are arranged at the upper end and the lower end of the sealing opening, the sealing performance of the valve can be remarkably improved through double-side double sealing, it is ensured that media do not leak, and when the valve is in a closed state, sealing of the upper valve clack and the lower valve clack can more effectively prevent the media from leaking; the other valve clack can provide additional sealing protection, meanwhile, under the high-pressure environment, the sealing structures of the upper valve clack and the lower valve clack can provide higher mechanical strength, the overall sealing effect of the valve is improved, meanwhile, connection between a cavity between the upper valve clack and the lower valve clack and the outside is effectively blocked through the arrangement of the sealing air bag, and therefore the sealing effect of the valve is improved. Pseudo connection between the upper valve clack and the lower valve clack is achieved, the sealing area is increased, the pressure borne by the valve clacks is reduced, and then the sealing effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of stop valves, and in particular to a pipeline double-sealing stop valve structure. Background Art

[0002] The stop valve, also known as the gate valve, is a forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to prevent leakage. When the medium enters the valve from below the valve disc, the resistance that the operating force needs to overcome is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem must be larger, otherwise the valve stem will bend. As one of the most important shut-off valves, the stop valve plays an important role in the aerospace field. As an important component of aerospace equipment, the stop valve realizes the functions of medium transportation, shutoff, and regulation, and its sealing performance directly affects the safe and reliable operation of aerospace equipment.

[0003] In the prior art, the stop valve is sealed by applying torque to the valve stem, which applies pressure to the valve disc in the axial direction, so that the valve disc sealing surface and the valve seat sealing surface are closely fitted to prevent the medium from leaking along the gap between the sealing surfaces. However, the common valve body has only a single-layer sealing structure. When the single-layer seal is used for a long time or works under harsh conditions, if the valve disc is worn and is subjected to a large fluid pressure, it is easy to leak, resulting in poor overall sealing effect of the valve. How to invent a pipeline double-sealed stop valve structure to solve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0004] In order to make up for the above shortcomings, the present invention provides a pipeline double-sealed stop valve structure, which aims to solve the problem of poor single-layer sealing structure of common stop valves.

[0005] The present invention is achieved in that:

[0006] The present invention provides a pipeline double-sealed stop valve structure, comprising a valve body and a screw arranged on the valve body, wherein a sealing port is opened at the upper end of the valve body, a fixing plate is installed on the inner wall of the sealing port, a valve seat is installed inside the valve body, a sealing ring is installed on the inner wall of the valve seat, and a valve cover is installed on the inner wall of the sealing port;

[0007] The outer wall of the screw rod is threadedly connected to the inner wall of the valve cover, the lower end of the screw rod is provided with a valve stem, and the lower end of the valve stem is provided with a lower valve disc.

[0008] Preferably, the outer wall of the valve cover and the inner wall of the sealing port are threadedly connected, a limiting shaft is installed at the lower end of the screw, and a hand wheel is installed at the upper end of the screw.

[0009] Preferably, a limiting groove rotatably connected to the outer wall of the limiting shaft is formed at the upper end of the valve stem, and the lower valve flap and the sealing port are sealingly connected near the lower end of the sealing ring.

[0010] Preferably, a fixing plate is installed on the inner wall of the valve body, and two groups of symmetrical ear plates are installed on the outer wall of the fixing plate, and the inner walls of the ear plates are rotatably connected to pulleys.

[0011] Preferably, a connecting plate is installed on the outer wall of the valve stem, a symmetrical rope is fixedly connected to the outer wall of the connecting plate, the outer wall of the rope is slidably connected to the inner wall of the fixed plate, and the outer wall of the rope is slidably connected to the outer wall of the pulley.

[0012] Preferably, the outer wall of the valve stem is slidably connected to an upper valve flap, fixed blocks are installed at both ends of the upper valve flap, the upper end of the fixed block is fixedly connected to one end of a rope, the upper end of the upper valve flap is installed with a sliding sleeve slidably connected to the outer wall of the valve stem, and the upper end of the upper valve flap is installed with an extrusion spring fixedly connected to a fixed plate.

[0013] By adopting the above technical solution, when the valve needs to be sealed as a whole, the screw is rotated by the handwheel to drive the valve stem to slide upward, and the lower valve disc at the lower end of the valve stem moves upward so that its upper end contacts the lower end of the sealing ring, and at the same time, the lower valve disc is sealed through the outer sealing ring and the inner wall of the sealing port. At this time, the lower sealing of the sealing port is completed. While the lower valve disc moves upward to seal, the connecting plate on the outer side of the valve stem slides upward. At this time, the rope on the connecting plate slides upward, and at the same time, it rebounds under the action of the extrusion spring, so that the upper valve disc installed below pulls the rope to move downward until one end of the upper valve disc rests in the sealing port. The upper end of the sealing ring completes the upper sealing of the sealing port at this time. Compared with the conventional single-sided sealing, the double sealing on both sides can significantly improve the sealing performance of the valve, ensure that the medium does not leak, thereby ensuring the safety and efficient operation of the system. When the valve is closed, the sealing of the upper and lower valve discs can more effectively prevent medium leakage. When one of the valve discs fails, the other valve disc can also provide additional sealing protection. At the same time, under high pressure environment, the sealing structure of the upper and lower valve discs can provide stronger mechanical strength to prevent medium leakage caused by excessive pressure and improve the overall sealing effect of the valve.

[0014] Preferably, a sealing groove is provided at the upper end of the lower valve disc, a piston groove is provided on the inner wall of the sealing groove, a plurality of air passages are provided on the side wall of the piston groove, an installation groove is provided at one end of the air passage, a sealing air bag is installed on the inner wall of the installation groove, and when the sealing air bag is filled with air, its side wall and upper end are respectively sealed and connected to the sealing ring and the outer wall of the upper valve disc.

[0015] Preferably, the inner wall of the piston groove is slidably connected with a piston rod, and the lower end of the piston rod is provided with a return spring fixedly connected to the inner wall of the piston groove.

[0016] Preferably, a sealing sleeve slidably connected to the inner wall of the sealing groove is installed at the lower end of the upper valve disc, and an elastic sealing ring sealingly connected to the inner wall of the sealing groove is installed at the lower end of the sealing sleeve.

[0017] By adopting the above technical scheme, when the lower valve disc moves up and the upper valve disc moves down to seal the sealing port, the sealing sleeve at the lower end of the upper valve disc is inserted into the sealing groove of the lower valve disc, and the elastic sealing ring at the lower end of the sealing sleeve is tightly pressed against the side walls of the sealing groove, so as to realize the sealing between the sealing sleeve and the lower valve disc, and avoid the leakage of the liquid and gas medium through the upper valve disc caused by the intermittent sliding between the valve stem and the upper valve disc when the lower valve disc fails, thereby ensuring the sealing strength between the lower valve disc and the upper valve disc, ensuring that the leakage of the medium can be prevented more effectively, and improving the sealing effect of the system. At the same time, the sealing sleeve During the downward movement, the piston rod is pushed to squeeze the return spring at the lower end for compression, so that the air inside the piston groove enters the interior of the sealing airbag through the airway, thereby inflating the sealing airbag and expanding the sealing airbag. The side wall of the inflated sealing airbag is sealed and connected to the inner wall of the sealing ring, and the upper end is tightly against the lower end of the upper valve disc to achieve sealing, effectively blocking the connection between the cavity between the upper valve disc and the lower valve disc and the outside, achieving a pseudo-connection between the upper valve disc and the lower valve disc, increasing the sealing area, reducing the fluid pressure on the valve disc, and thereby improving the sealing effect.

[0018] The beneficial effects of the present invention are:

[0019] Compared with conventional single-sided sealing, the two valve discs set at the upper and lower ends of the sealing port can significantly improve the sealing performance of the valve through double-sided double sealing to ensure that the medium does not leak, thereby ensuring the safe and efficient operation of the system. When the valve is closed, the sealing of the upper and lower valve discs can more effectively prevent the leakage of the medium. When one of the valve discs fails, the other valve disc can also provide additional sealing protection. At the same time, under high-pressure environment, the sealing structure of the upper and lower valve discs can provide stronger mechanical strength to prevent the leakage of the medium caused by excessive pressure, thereby improving the overall sealing effect of the valve;

[0020] The sealing sleeve is provided to achieve the sealing between the sealing sleeve and the lower valve disc, so as to prevent the lower valve disc from failing and the liquid and gas medium from passing through the upper valve disc through the interval of sliding between the valve stem and the upper valve disc, thereby ensuring the sealing strength between the lower valve disc and the upper valve disc, ensuring that the leakage of the medium can be prevented more effectively and improving the sealing effect of the system;

[0021] At the same time, the setting of the sealing airbag effectively blocks the connection between the cavity between the upper valve flap and the lower valve flap and the outside, realizes a pseudo connection between the upper valve flap and the lower valve flap, increases the sealing area, reduces the fluid pressure on the valve flap, and thereby improves the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure of a pipeline double-sealed stop valve provided in an embodiment of the present invention;

[0024] Figure 2 It is a partial cross-sectional view of a pipeline double-sealed stop valve structure provided by an embodiment of the present invention;

[0025] Figure 3 A pipeline double-sealed stop valve structure provided by the embodiment of the present invention Figure 2 A magnified view of the structure of the middle A area;

[0026] Figure 4 It is a half-section diagram of a pipeline double-sealed stop valve structure provided by an embodiment of the present invention;

[0027] Figure 5 A pipeline double-sealed stop valve structure provided by the embodiment of the present invention Figure 4 A magnified view of the structure of the middle B region;

[0028] Figure 6 A pipeline double-sealed stop valve structure provided by the embodiment of the present invention Figure 4 A magnified view of the structure of the middle C region;

[0029] Figure 7 It is an overall cross-sectional view of a pipeline double-sealed stop valve structure provided by an embodiment of the present invention;

[0030] Figure 8 A pipeline double-sealed stop valve structure provided by the embodiment of the present invention Figure 7 A magnified view of the structure in region D.

[0031] In the figure: 1. valve body; 2. sealing port; 3. valve seat; 4. sealing ring; 5. valve cover; 6. screw; 61. limiting shaft; 62. hand wheel; 7. valve stem; 71. limiting groove; 8. lower valve disc; 81. sealing groove; 82. piston groove; 83. airway; 84. mounting groove; 9. connecting plate; 10. fixing plate; 11. ear plate; 12. pulley; 13. rope; 14. upper valve disc; 141. fixing block; 142. sliding sleeve; 15. extrusion spring; 16. sealing sleeve; 161. elastic sealing ring; 17. piston rod; 18. return spring; 19. sealing airbag. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0033] Example, see Figure 1-Figure 8 A pipeline double-sealed stop valve structure comprises a valve body 1 and a screw 6 arranged on the valve body 1, a sealing port 2 is opened at the upper end of the valve body 1, a fixing plate 10 is installed on the inner wall of the sealing port 2, a valve seat 3 is installed inside the valve body 1, a sealing ring 4 is installed on the inner wall of the valve seat 3, and a valve cover 5 is installed on the inner wall of the sealing port 2;

[0034] The outer wall of the screw rod 6 is threadedly connected to the inner wall of the valve cover 5 . The lower end of the screw rod 6 is provided with a valve stem 7 , and the lower end of the valve stem 7 is provided with a lower valve disc 8 .

[0035] Further, the outer wall of the valve cover 5 is threadedly connected to the inner wall of the sealing port 2, a limiting shaft 61 is installed at the lower end of the screw 6, a hand wheel 62 is installed at the upper end of the screw 6, a limiting groove 71 is opened at the upper end of the valve stem 7 and is rotatably connected to the outer wall of the limiting shaft 61, the lower valve disc 8 and the sealing port 2 are sealed and connected near the lower end of the sealing ring 4, a fixing plate 10 is installed on the inner wall of the valve body 1, two groups of symmetrical ear plates 11 are installed on the outer wall of the fixing plate 10, and a pulley 12 is rotatably connected to the inner wall of the ear plate 11, and a connecting plate 9 is installed on the outer wall of the valve stem 7, which is connected The outer wall of the plate 9 is fixedly connected with a symmetrical rope 13, the outer wall of the rope 13 is slidably connected to the inner wall of the fixed plate 10, the outer wall of the rope 13 is slidably connected to the outer wall of the pulley 12, the outer wall of the valve stem 7 is slidably connected to an upper valve flap 14, both ends of the upper valve flap 14 are installed with fixed blocks 141, the upper end of the fixed block 141 is fixedly connected to one end of the rope 13, the upper end of the upper valve flap 14 is installed with a sliding sleeve 142 slidably connected to the outer wall of the valve stem 7, and the upper end of the upper valve flap 14 is installed with an extrusion spring 15 fixedly connected to the fixed plate 10.

[0036] It should be noted that: when the valve needs to be sealed as a whole, the screw 6 is rotated by the hand wheel 62 to drive the valve stem 7 to slide upward, and the lower valve disc 8 at the lower end of the valve stem 7 moves upward so that its upper end contacts the lower end of the sealing ring 4. At the same time, the lower valve disc 8 is sealed through the outer sealing ring and the inner wall of the sealing port 2. At this time, the lower sealing of the sealing port 2 is completed. While the lower valve disc 8 moves upward to seal, the connecting plate 9 on the outer side of the valve stem 7 slides upward. At this time, the rope 13 on the connecting plate 9 slides upward and rebounds under the action of the extrusion spring 15, so that the upper valve disc 14 installed below pulls the rope 13 to move downward until the upper valve disc 14 One end of is against the upper end of the sealing ring 4 in the sealing port 2, and the upper sealing of the sealing port 2 is completed at this time. Compared with the conventional single-sided sealing, the double sealing on both sides can significantly improve the sealing performance of the valve to ensure that the medium does not leak, thereby ensuring the safety and efficient operation of the system. When the valve is closed, the sealing of the upper and lower valve discs can more effectively prevent the leakage of the medium. When one of the valve discs fails, the other valve disc can provide additional sealing protection. At the same time, under high pressure environment, the sealing structure of the upper and lower valve discs can provide stronger mechanical strength to prevent the leakage of the medium caused by excessive pressure and improve the overall sealing effect of the valve.

[0037] Furthermore, a sealing groove 81 is provided at the upper end of the lower valve disc 8, a piston groove 82 is provided on the inner wall of the sealing groove 81, a plurality of air passages 83 are provided on the side wall of the piston groove 82, a mounting groove 84 is provided at one end of the air passage 83, a sealing air bag 19 is installed on the inner wall of the mounting groove 84, and after the sealing air bag 19 is filled with air, its side wall and the upper end are respectively sealed and connected to the outer wall of the sealing ring 4 and the upper valve disc 14, a piston rod 17 is slidably connected to the inner wall of the piston groove 82, a return spring 18 fixedly connected to the inner wall of the piston groove 82 is installed at the lower end of the piston rod 17, a sealing sleeve 16 slidably connected to the inner wall of the sealing groove 81 is installed at the lower end of the upper valve disc 14, and an elastic sealing ring 161 sealingly connected to the inner wall of the sealing groove 81 is installed at the lower end of the sealing sleeve 16.

[0038] It should be noted that: when the lower valve disc 8 moves upward and the upper valve disc 14 moves downward to seal the sealing port 2, the sealing sleeve 16 at the lower end of the upper valve disc 14 is inserted into the sealing groove 81 of the lower valve disc 8, and the elastic sealing ring 161 at the lower end of the sealing sleeve 16 is tightly pressed between the side walls of the sealing groove 81 to achieve the sealing between the sealing sleeve 16 and the lower valve disc 8, so as to avoid the lower valve disc 8 from failing. The liquid and gas medium passes through the upper valve disc 14 through the interval of sliding between the valve stem 7 and the upper valve disc 14 and causes leakage, thereby ensuring the sealing strength between the lower valve disc 8 and the upper valve disc 14, ensuring that the leakage of the medium can be prevented more effectively, and improving the sealing effect of the system. At the same time, the sealing sleeve During the downward movement of 16, the piston rod 17 is pushed to squeeze the return spring 18 at the lower end for compression, so that the air inside the piston groove 82 enters the interior of the sealing airbag 19 through the airway 83, thereby inflating the sealing airbag 19 and expanding the sealing airbag 19. The side wall of the inflated sealing airbag 19 is sealed and connected to the inner wall of the sealing ring 4, and the upper end is tightly against the lower end of the upper valve flap 14 to achieve sealing, effectively blocking the connection between the cavity between the upper valve flap 14 and the lower valve flap 8 and the outside, realizing a pseudo-connection between the upper valve flap 14 and the lower valve flap 8, increasing the sealing area, reducing the fluid pressure on the valve flap, and thereby improving the sealing effect.

[0039] The working principle of this pipeline double seal stop valve structure:

[0040] When the valve needs to be sealed as a whole, the screw 6 is rotated by the hand wheel 62 to drive the valve stem 7 to slide upward, and the lower valve disc 8 at the lower end of the valve stem 7 moves upward so that its upper end contacts the lower end of the sealing ring 4. At the same time, the lower valve disc 8 is sealed through the outer sealing ring and the inner wall of the sealing port 2. At this time, the lower sealing of the sealing port 2 is completed. While the lower valve disc 8 moves up to seal, the connecting plate 9 on the outer side of the valve stem 7 slides upward. At this time, the rope 13 on the connecting plate 9 slides upward, and at the same time, it rebounds under the action of the extrusion spring 15, so that the upper valve disc 14 installed below pulls the rope 13 to move downward until the upper valve disc One end of the upper valve disc 14 is against the upper end of the sealing ring 4 in the sealing port 2, and the upper sealing of the sealing port 2 is completed at this time. At the same time, the sealing sleeve 16 at the lower end of the upper valve disc 14 is inserted into the sealing groove 81 of the lower valve disc 8, and the elastic sealing ring 161 at the lower end of the sealing sleeve 16 is tightly against the side walls of the sealing groove 81, so as to achieve the sealing between the sealing sleeve 16 and the lower valve disc 8, and avoid the lower valve disc 8 failure. The liquid and gas medium passes through the upper valve disc 14 through the interval of sliding between the valve stem 7 and the upper valve disc 14 to cause leakage, thereby ensuring the sealing strength between the lower valve disc 8 and the upper valve disc 14, ensuring that it can more effectively prevent the leakage of the medium, and improving The sealing effect of the system is improved. At the same time, the piston rod 17 is pushed to squeeze the return spring 18 at the lower end during the downward movement of the sealing sleeve 16, so that the air inside the piston groove 82 enters the interior of the sealing airbag 19 through the airway 83, thereby inflating the sealing airbag 19 and expanding the sealing airbag 19. The side wall of the expanded sealing airbag 19 is sealed and connected to the inner wall of the sealing ring 4, and the upper end is tightly against the lower end of the upper valve flap 14 to achieve sealing, effectively blocking the connection between the cavity between the upper valve flap 14 and the lower valve flap 8 and the outside, realizing a pseudo connection between the upper valve flap 14 and the lower valve flap 8, and improving the sealing surface. The double seal on both sides can significantly improve the sealing performance of the valve and ensure that the medium does not leak, thereby ensuring the safe and efficient operation of the system. When the valve is closed, the seals of the upper and lower valve discs can more effectively prevent medium leakage. When one of the valve discs fails, the other valve disc can provide additional sealing protection. At the same time, under high pressure, the sealing structure of the upper and lower valve discs can provide stronger mechanical strength to prevent medium leakage caused by excessive pressure and improve the overall sealing effect of the valve.

[0041] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pipeline double-sealed stop valve structure, comprising a valve body (1) and a screw (6) arranged on the valve body (1), characterized in that: The upper end of the valve body (1) is provided with a sealing opening (2), the inner wall of the sealing opening (2) is provided with a fixing plate (10), the interior of the valve body (1) is provided with a valve seat (3), the inner wall of the valve seat (3) is provided with a sealing ring (4), and the inner wall of the sealing opening (2) is provided with a valve cover (5); The outer wall of the screw rod (6) is threadedly connected to the inner wall of the valve cover (5); a valve stem (7) is installed at the lower end of the screw rod (6); and a lower valve disc (8) is installed at the lower end of the valve stem (7).

2. A pipeline double sealing stop valve structure according to claim 1, characterized in that: The outer wall of the valve cover (5) and the inner wall of the sealing port (2) are threadedly connected, a limiting shaft (61) is installed at the lower end of the screw rod (6), and a hand wheel (62) is installed at the upper end of the screw rod (6).

3. A pipeline double sealing stop valve structure according to claim 2, characterized in that: The upper end of the valve stem (7) is provided with a limit groove (71) rotatably connected to the outer wall of the limit shaft (61), and the lower valve flap (8) and the sealing opening (2) are sealed and connected near the lower end of the sealing ring (4).

4. A pipeline double sealing stop valve structure according to claim 3, characterized in that: A fixing plate (10) is installed on the inner wall of the valve body (1), two groups of symmetrical ear plates (11) are installed on the outer wall of the fixing plate (10), and a pulley (12) is rotatably connected to the inner wall of the ear plate (11).

5. A pipeline double sealing stop valve structure according to claim 4, characterized in that: The outer wall of the valve stem (7) is installed with a connecting plate (9), the outer wall of the connecting plate (9) is fixedly connected with a symmetrical rope (13), the outer wall of the rope (13) is slidably connected to the inner wall of the fixed plate (10), and the outer wall of the rope (13) is slidably connected to the outer wall of the pulley (12).

6. A pipeline double sealing stop valve structure according to claim 5, characterized in that: The outer wall of the valve stem (7) is slidably connected to an upper valve flap (14), and fixed blocks (141) are installed at both ends of the upper valve flap (14). The upper end of the fixed block (141) is fixedly connected to one end of the rope (13), and the upper end of the upper valve flap (14) is installed with a sliding sleeve (142) slidably connected to the outer wall of the valve stem (7), and the upper end of the upper valve flap (14) is installed with an extrusion spring (15) fixedly connected to the fixing plate (10).

7. A pipeline double sealing stop valve structure according to claim 1, characterized in that: A sealing groove (81) is provided at the upper end of the lower valve disc (8), a piston groove (82) is provided on the inner wall of the sealing groove (81), a plurality of air passages (83) are provided on the side wall of the piston groove (82), a mounting groove (84) is provided at one end of the air passage (83), a sealing air bag (19) is installed on the inner wall of the mounting groove (84), and when the sealing air bag (19) is filled with air, its side wall and the upper end are respectively sealed and connected to the sealing ring (4) and the outer wall of the upper valve disc (14).

8. A pipeline double-sealed stop valve structure according to claim 7, characterized in that: The inner wall of the piston groove (82) is slidably connected with a piston rod (17), and the lower end of the piston rod (17) is provided with a return spring (18) fixedly connected with the inner wall of the piston groove (82).

9. A pipeline double sealing stop valve structure according to claim 8, characterized in that: A sealing sleeve (16) is mounted at the lower end of the upper valve flap (14) and is slidably connected to the inner wall of the sealing groove (81). An elastic sealing ring (161) is mounted at the lower end of the sealing sleeve (16) and is sealingly connected to the inner wall of the sealing groove (81).

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