Sealing assembly with lubricating effect

Abstract

The sealing assembly with the lubricating effect comprises end face sealing molds, a cylindrical piece and backing rings, the end face sealing molds are arranged at the two ends of the cylindrical piece through the backing rings respectively, and the backing rings are arranged along the top end and / or the bottom end of the cylindrical piece in a shape-following mode; a groove is formed in the side, close to the backing ring, of the cylindrical part, and the backing ring is detachably attached to or separated from the groove; according to the sealing assembly with the lubricating effect, the structural arrangement of the sealing assembly is simplified, the lubricating effect and the sealing effect of the sealing assembly are improved, the problem that cold deformation machining of an existing cylindrical part is insufficient is solved, the safety and the reliability of the sealing assembly are improved, and the disassembly and assembly efficiency of the assembly is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to metal cold deformation processing technical field, specifically, relate to a high pressure fluid sealing assembly with lubrication effect. BACKGROUND

[0002] The austenitic stainless steel cylinder piece cannot be strengthened by heat treatment means due to single-phase organization, and can only use cold deformation strengthening to obtain required mechanical properties for high-strength application occasions. The commonly used cylinder piece cold deformation strengthening process is mechanical expansion and hydraulic expansion method. The mechanical expansion uses the radial pressure generated by the conical end face sealing die to make the cylinder piece expand to achieve the purpose of cylinder piece deformation strengthening. However, due to the influence of friction and other factors, it is usually difficult to achieve uniform deformation and may produce large internal stress. The basic principle of hydraulic expansion method is to use liquid to establish high pressure on the cylinder wall to make the cylinder piece deform and strengthen. Due to the influence of friction, the deformation is uniform and the internal stress is small. However, it is necessary to establish high pressure sealing on the end face of the cylinder piece to form a closed cavity.

[0003] When hydraulic expansion is used, the cylinder piece will deform, and there is sliding between the cylinder piece and the end sealing die. The sealing is high-pressure sliding sealing. In order to ensure the sealing effect, uniform high-pressure contact stress needs to be established between the end sealing die and the ring cylinder to ensure the sealing effect. Therefore, the sealing effect is closely related to the surface quality, machining accuracy, uniformity of loading force and other factors of the end sealing die and the cylinder piece. In the sliding process, surface biting and tearing faults may also occur, affecting the sealing effect. Once leakage occurs, the internal high pressure cannot be maintained, which will affect the cold deformation strengthening effect of the cylinder piece, leading to product scrap, and in severe cases, safety accidents may also occur due to high-pressure fluid.

[0004] In the existing cylinder piece cold deformation strengthening process, such as the patent CN220161048U, the upper and lower end face sealing dies are in contact with the cylinder piece, and the sealing is provided by the hard contact between the two. However, after the cylinder piece is deformed and strengthened, the inner surface of the end part of the cylinder piece is easy to produce biting and other defects, which leads to poor contact between the cylinder piece and the end face sealing die, and there is a risk of leakage. Therefore, on the basis of meeting the requirements of cylinder piece hydraulic cold deformation processing, how to improve the lubrication effect and sealing effect of the assembly is one of the problems to be solved.

[0005] In patent publication CN101535693A, a method and device for sealing an ultra-high pressure fluid system are mentioned, the device including a seal support subjected to a sufficiently high compression force to compress the seal support uniformly in the radial direction against the bearing. When the assembly is subjected to ultra-high pressure, uniformly compressing the seal support against the bearing causes the inner surface of the bore through the bearing to achieve substantially uniform circumferential contact with the outer surface of the plunger, thus eliminating the gap that occurs in prior art systems. However, due to the complex structure, it is prone to cause high cost and low maintenance efficiency. Utility model content

[0006] Therefore, the utility model discloses a sealing assembly with lubricating effect to solve the unreliable sealing between end face sealing mould and cylindrical piece in the cold deformation processing of cylindrical piece in prior art, caused by insufficient machining accuracy, uneven stress, poor surface quality etc., and the leakage between mould and cylindrical piece caused by poor lubrication, simplify the structural arrangement of sealing assembly, improve the lubricating effect and sealing effect of sealing assembly, solve the problem of insufficient cold deformation processing of cylindrical piece, and improve the safety and reliability of sealing assembly and the dismounting efficiency of assembly.

[0007] To achieve the above object, the technical scheme of the utility model is as follows:

[0008] The utility model discloses a sealing assembly with lubricating effect, including end face sealing mould, cylindrical piece and gasket ring, and end face sealing mould is set up at both ends of cylindrical piece through gasket ring, and gasket ring is set up along the top and / or bottom of cylindrical piece with the type, the side of cylindrical piece close to gasket ring is provided with recess, and gasket ring is set up with recess with the mode of detachable.

[0009] Further, the recess is a concentric circular recess.

[0010] Further, the end face sealing mould includes upper end face sealing mould, lower end face sealing mould and guide column, the guide column is set up in the inside of upper end face sealing mould with the mode of movable, the inside wall of the top of cylindrical piece abuts or separates with upper end face sealing mould, and the inside wall of the bottom of cylindrical piece abuts or separates with lower end face sealing mould.

[0011] Further, the upper end face sealing mould includes mould one part, mould two parts and mould three parts, and the mould three part outside wall abuts or separates with the inside wall of the top of cylindrical piece.

[0012] Further, the shape of mould three part and lower end face sealing mould is all conical frustum, and the taper of lower end face sealing mould and mould three part is respectively alpha 1 and alpha 2, and the value range of alpha 1 and alpha 2 is all 0 °-90 °.

[0013] Further, the inner side wall of the cylindrical part is composed of a first plane, a second plane and a third plane, the first plane is connected with the third plane through the second plane, the first plane and the third plane are abutted or separated from the end face sealing die through the gasket ring, and the second plane is arranged in parallel with the outer side wall of the cylindrical part.

[0014] Further, the first plane and the third plane are both inclined planes, and the inclination of the first plane and the third plane is equal to the taper α2 of the three-cone surface of the die and the taper α1 of the cone surface of the lower end face sealing die respectively.

[0015] Further, the gasket ring is a metal gasket ring, and the metal gasket ring adopts a thin-walled ring part.

[0016] Further, the material of the metal gasket ring is red copper.

[0017] Further, the gasket ring comprises a first gasket ring, a second gasket ring and a third gasket ring, the first gasket ring is connected with the second gasket ring and the third gasket ring through the second gasket ring, the bottom side or the top side of the first gasket ring is arranged in close contact with the top or the bottom of the cylindrical part, one side of the second gasket ring is arranged in close contact with the first plane or the third plane of the cylindrical part, the other side of the second gasket ring is abutted or separated from the cone surface of the upper end face sealing die or the lower end face sealing die, and the outer side of the third gasket ring is arranged in close contact with the second plane of the cylindrical part.

[0018] Compared with the prior art, the sealing assembly with the lubricating effect has the following beneficial effects:

[0019] Through the arrangement of the sealing assembly, the structure of the sealing assembly can be simplified, the lubricating effect and the sealing effect of the sealing assembly can be improved, the problem of the insufficient cold deformation processing of the cylindrical part can be solved, and then the safety and reliability of the sealing assembly can be improved, and the disassembly and assembly efficiency of the assembly can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Some of the accompanying drawings form a part of the present disclosure and are included to further provide a description of embodiments of the present disclosure. The description of the illustrative embodiments is used to explain the present disclosure and is not meant to limit the present disclosure in any way. In the drawings:

[0021] Figure 1 It is a whole structure schematic view of the sealing assembly in the fluid hydraulic expansion process of the cylindrical part.

[0022] Figure 2 It is a local enlarged view schematic view of the whole structure B of the sealing assembly in the fluid hydraulic expansion process of the cylindrical part.

[0023] Explanation of reference signs: 1, end face sealing mold; 11, upper end face sealing mold; 111, through hole; 112, mold one part; 113, mold two parts; 114, mold three parts; 12, lower end face sealing mold; 121, water injection hole; 13, guide column; 14, sealing ring; 2, cylindrical part; 20, groove; 21, first plane; 22, second plane; 23, third plane; 3, gasket ring; 31, gasket one ring; 32, gasket two ring; 33, gasket three ring. DETAILED DESCRIPTION

[0024] The utility model concepts of the present disclosure will be described below using terms generally used by those skilled in the art to convey the substance of their work to other skilled artisans in the art. However, these utility model concepts can be embodied in many different forms, and therefore should not be considered limited to the embodiments described herein.

[0025] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0026] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the indicated device or element to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model.

[0027] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0028] In the prior art, during the sliding process of the cylindrical part and the end sealing mold, surface occlusion and pulling injury faults may occur, affecting the sealing effect. Once leakage occurs, the internal high pressure cannot be maintained, which will affect the cold deformation strengthening effect of the cylindrical part, leading to product scrap, and in severe cases, safety accidents may also occur due to high-pressure fluid.

[0029] In order to solve the problem of unreliable sealing between the end face sealing mold and the cylindrical part and insufficient lubrication during the hydraulic expansion process of the cold deformation of the cylindrical part in the prior art, the embodiment proposes a sealing assembly with lubrication effect, specifically a high-pressure fluid sealing assembly for the cold deformation process of an austenitic stainless steel cylindrical part, comprising an end face sealing mold 1, a cylindrical part 2 and a gasket ring 3, the end face sealing mold 1 is arranged at both ends of the cylindrical part 2 through the gasket ring 3, and the gasket ring 3 is arranged along the top end and / or the bottom end of the cylindrical part 2; a groove 20 is arranged on one side of the cylindrical part 2 close to the gasket ring 3, and the gasket ring 3 is arranged in a detachable manner with the groove 20. The end face sealing mold 1 is conical, which is used to provide end face sealing for the cylindrical part 2.

[0030] Through the arrangement of the sealing assembly, the structure of the sealing assembly can be simplified, the lubrication effect and sealing effect of the sealing assembly are improved, the problem of insufficient cold deformation processing of the cylindrical part 2 is solved, and the safety and reliability of the sealing assembly are improved, and the disassembly and assembly efficiency of the assembly is improved.

[0031] The end face sealing mold 1 comprises an upper end face sealing mold 11, a lower end face sealing mold 12, and a guide column 13 movably arranged inside the upper end face sealing mold 11, the upper end face sealing mold 11 abuts or separates from the inner side wall of the top of the cylindrical part 2, and the lower end face sealing mold 12 abuts or separates from the inner side wall of the bottom of the cylindrical part 2. The end of the guide column 13 away from the upper end face sealing mold 11 is arranged inside the cylindrical part 2. The upper end face sealing mold 11 comprises a through hole 111 arranged at the position of the axis A of the upper end face sealing mold 11. The guide column 13 is movably arranged in the through hole 111, and the outer side wall of the guide column 13 abuts or separates from the inner side wall of the through hole 111. The guide column 13 is provided with an annular groove arranged at the top end of the guide column 13. The end face sealing mold 1 further comprises a sealing ring 14 arranged in the annular groove, and the outer side wall of the sealing ring 14 abuts or separates from the inner side wall of the through hole 111. The lower end face sealing mold 12 comprises a water injection hole 121 arranged at the position of the axis A of the lower end face sealing mold 12; and is used as a water injection channel. In addition, the end face sealing mold 1 is a key component for determining the end face sealing, and is required to have high strength and hardness, and high surface quality to reduce the friction between the end face sealing mold 1 and the cylindrical part 2.

[0032] Through the arrangement of the end face sealing mold 1, liquid or water can be injected under the action of the through hole 111 or the water injection hole 121, and effective sealing of the sealing assembly can be realized under the cooperation of the guide column 13, so as to avoid the problem of liquid leakage, and the overall structure of the sealing assembly can be effectively simplified, the cost of the sealing assembly is reduced, and the disassembly and assembly efficiency of the sealing assembly is improved.

[0033] Specifically, the upper end face sealing mold 11 comprises a mold first part 112, a mold second part 113 and a mold third part 114. The mold first part 112, the mold second part 113 and the mold third part 114 are integrally formed. The mold first part 112 is connected with the mold second part 113 and the mold third part 114, and the outer side wall of the mold third part 114 abuts or separates with the inner side wall of the top of the cylindrical part 2. The mold first part 112 and the mold second part 113 are both hollow cylinders, and the diameter of the mold first part 112 is greater than that of the mold second part 113. The mold third part 114 and the lower end face sealing mold 12 are both in the shape of a truncated cone, and the taper of the lower end face sealing mold 12 and the mold third part 114 is α1 and α2 respectively, and the value range of α1 and α2 is 0°-90°. The specific value of α1 and α2 is set according to the requirement. Preferably, α1 = α2.

[0034] Through the setting of the parts of the upper end face sealing mold 11, the top end of the cylindrical part 2 can be effectively sealed, and the phenomenon of damage of the sealing assembly caused by excessive pressure can be avoided, so that the stability and reliability of the sealing assembly can be improved, and the use safety of the sealing assembly can be ensured.

[0035] The top end and the bottom end of the cylindrical part 2 are both provided with inclined surfaces, the taper of the inclined surfaces is consistent with that of the end face sealing mold, and the grooves 20 provided on the inclined surfaces are concentric circular grooves. Specifically, the inner side wall of the cylindrical part 2 is composed of a first plane 21, a second plane 22 and a third plane 23, and the first plane 21, the second plane 22 and the third plane 23 are integrally formed. The first plane 21 is connected with the third plane 23 through the second plane 22, and the first plane 21 and the third plane 23 both abut or separate with the end face sealing mold 1 through the gasket 3. The second plane 22 is parallel to the outer side wall of the cylindrical part 2. The included angles between the first plane 21 and the second plane 22 and between the third plane 23 and the second plane 22 are α3 and α4 respectively, and the value range of α3 and α4 is 90°-180°. The specific value of α3 and α4 is set according to the requirement. Preferably, α3 = α4. The first plane 21 and the third plane 23 are both inclined surfaces, and the inclination of the first plane 21 and the third plane 23 is respectively consistent with and equal to the taper α2 of the taper of the mold third part 114 and the taper α1 of the taper of the lower end face sealing mold 12, that is, the inclination tan(α3-90°) of the first plane 21 is equal to the taper α2 of the taper of the mold third part 114, and the inclination tan(α4-90°) of the third plane 23 is equal to the taper α1 of the taper of the lower end face sealing mold 12. In addition, the first plane 21 and the third plane 23 are both provided with concentric circular grooves, and the number of the concentric circular grooves is at least 3. The concentric circular grooves are uniformly distributed along the first plane 21 and the third plane 23. The depth of the concentric circular grooves is R, R is a positive number, and the specific value of R is set according to the requirement. The value range of R is 1mm-2mm. The value range of the groove spacing of the concentric circular grooves is 4mm-6mm. It should be noted that the depth and the spacing of the concentric circular grooves depend on the thickness of the gasket 3.

[0036] The inner end face of the cylindrical part 2 is machined to have a slope, the slope of which is consistent with the taper of the end face sealing die 1, to ensure the fit of the end face sealing die 1 and the end face of the cylindrical part 2. A concentric circular groove is machined on the slope along the axial direction of the cylindrical part 2, which is beneficial to prevent the dislocation of the gasket ring 3 under the cooperation with the gasket ring 3, and is also beneficial to ensure the use safety of the overall structure of the sealing assembly and facilitate the disassembly and assembly efficiency of the sealing assembly.

[0037] The gasket ring 3 is a pressure-resistant lubricating metal gasket ring, and the metal gasket ring is a thin-walled annular part. The material of the metal gasket ring is red copper, which can form a self-lubricating film on the contact surface to reduce the friction coefficient of the contact and achieve the purpose of lubrication. The thickness of the metal gasket ring is L, L is a positive number, and the specific value of L is set according to the requirement. And L>R. The gasket ring 3 includes a first gasket ring 31, a second gasket ring 32 and a third gasket ring 33. The first gasket ring 31, the second gasket ring 32 and the third gasket ring 33 are integrally formed. The first gasket ring 31 is connected with the second gasket ring 32 and the third gasket ring 33. The bottom side or the top side of the first gasket ring 31 is arranged in abutment with the top or the bottom of the cylindrical part 2. One side of the second gasket ring 32 is arranged in abutment with the first plane 21 or the third plane 23 of the cylindrical part 2. The other side of the second gasket ring 32 is in abutment or separation with the third die part 114 of the upper end face sealing die 11 or the tapered surface of the lower end face sealing die 12. The outer side of the third gasket ring 33 is arranged in abutment with the second plane 22 of the cylindrical part 2. Specifically, the side of the second gasket ring 32 facing the cylindrical part 2 has a protrusion, the shape of the protrusion is consistent with the shape of the concentric circular groove, and the protrusion is obtained by plastic deformation of the second gasket ring 32 under the pressure of the end face sealing die 1. There are at least three protrusions, and the number of the protrusions is the same as the number of the teeth of the concentric circular groove.

[0038] During assembly, the pressure-resistant lubricating metal gasket ring 3 is arranged between the cylindrical part 2 and the tapered end face sealing die 1, and then the end face sealing die 1 is pressed downward to embed the metal gasket ring 3 in the concentric circular groove, thereby achieving the effect of sealing and lubrication. In addition, the sealing effect can be ensured while providing appropriate lubrication, and the deficiency of the cold deformation processing of the existing cylindrical part 2 is solved.

[0039] Working principle:

[0040] The inner and outer surfaces of the metal gasket 3 are smooth. Before bulging, the metal gasket 3 is placed at the inclined surface of the inner end face of the cylindrical part 2. In order to prevent the metal gasket 3 from being taken away from the end face of the cylindrical part 2 during the pressing of the end face sealing mold 1, the metal gasket 3 is subjected to flanging treatment, so that the metal gasket 3 is always located between the cylindrical part 2 and the end face sealing mold 1. The end face sealing mold 1 is pressed, the pressure-resistant lubricating metal gasket 3 is plastically deformed under stress, is pressed into the concentric circular groove, and forms a continuous sealing band, thereby achieving the sealing effect. The plastic deformation of the pressure-resistant lubricating metal gasket 3 can compensate for the gap between the end face sealing mold 1 and the cylindrical part 2 caused by the misalignment of the end face sealing mold 1 and uneven pressure, thereby reducing the risk of leakage. In order to ensure good lubrication and sealing effect during bulging, the metal gasket 3 should have good plasticity, excellent pressure-bearing capacity and lubricity, and the metal gasket 3 should not be subjected to serious plastic deformation due to high pressure on the contact surface and should not be subjected to fracture failure and biting during expansion cold deformation.

[0041] Embodiment 1

[0042] A kind of end face sealing assembly with lubricating effect and fluid expansion process, as Figure 1 shown, the middle is guide column 13, guide column 13 and end face sealing mold 1 between by O type sealing ring 14 sealing, prevent internal liquid's leakage;Cylindrical part 2 inner side upper and lower end face along inclined surface processing concentric circular groove, concentric circular groove depth is 1mm-2mm, the slot spacing between different tooth grooves in concentric circular groove is 4mm-6mm, the taper of inclined surface is consistent with the taper of end face sealing mold, the axial height of inclined surface should not be too large, specifically, the axial height of inclined surface = the height of cylindrical part 2 1 / 20 ± a, a is the height deviation value, the value range of a is between 0-1, the specific value of a is set according to the required. The structure of specific sealing assembly, as Figure 2 shown;Upper end face sealing mold 11, lower end face sealing mold 12 and cylindrical part 2 between are all set copper gasket ring, i.e. gasket 3, copper gasket ring is welded by 4mm copper plate, and is subjected to flanging treatment. Before hydraulic expansion, copper gasket ring is placed at the inclined surface of the upper and lower inner end face of the cylindrical part 2, and the copper gasket ring is completely pressed into the cylindrical part 2 by using the press, so that the flanging part is attached to the upper and lower end face of the cylindrical part 2. The lower end face sealing mold 12 is placed on the platform of the press, the cylindrical part 2 is hoisted to be centered with the lower end face sealing mold 12, then the upper end face sealing mold 11 is hoisted to the upper part of the cylindrical part, and the assembly is completed. The press is slowly pressed down, the copper gasket ring is pressed into the concentric circular groove, the upper end face sealing mold 11 and the lower end face sealing mold 12 establish initial sealing with the cylindrical part 2, then a high-pressure pump is used to inject liquid into the inner cavity of the cylindrical part 2 through the channel of the guide column 13, so that high pressure is established in the inner cavity of the cylindrical part 2. The press is slowly pressed down, the upper end face sealing mold 11 and the lower end face sealing mold 12 are close to each other, the volume of the inner cavity of the cylindrical part 2 is increased, which forces the cylindrical part 2 to expand outward, thereby achieving the bulging purpose.

[0043] By placing the gasket 3 between the end face sealing mold 1 and the cylindrical part 2 in the hydraulic expansion process, the high-efficiency sealing and lubricating functions can be realized simultaneously in the assembly and forming process of the sealing assembly under the cooperation of the gasket 3 and the concentric circular groove.

[0044] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A seal assembly having a lubricating effect, characterized by The end face sealing mold (1) is arranged at both ends of the cylindrical part (2) through the gasket ring (3), and the gasket ring (3) is arranged along the top end and / or the bottom end of the cylindrical part (2) in a profiled manner; a groove (20) is arranged on one side of the cylindrical part (2) close to the gasket ring (3), and the gasket ring (3) is arranged in a detachable manner in abutment with or separation from the groove (20).

2. A seal assembly with lubrication effect according to claim 1, characterized in that The groove (20) is a concentric circular groove.

3. The sealed assembly with lubricating effect according to claim 1, characterized in that, The end face sealing mold (1) comprises an upper end face sealing mold (11), a lower end face sealing mold (12) and a guide column (13), the guide column (13) is arranged in a movable manner inside the upper end face sealing mold (11), the upper end face sealing mold (11) is in abutment with or separation from the inner side wall of the top of the cylindrical part (2), and the lower end face sealing mold (12) is in abutment with or separation from the inner side wall of the bottom of the cylindrical part (2).

4. A seal assembly with lubrication effect according to claim 3, characterized in that The upper end face sealing mold (11) comprises a mold first part (112), a mold second part (113) and a mold third part (114); the mold first part (112) is connected with the mold second part (113) and the mold third part (114) through the mold second part (113), and the outer side wall of the mold third part (114) is in abutment with or separation from the inner side wall of the top of the cylindrical part (2).

5. A seal assembly with a lubricating effect according to claim 4, characterized in that The shapes of the mold third part (114) and the lower end face sealing mold (12) are both frustoconical, and the taper angles of the frustocones of the lower end face sealing mold (12) and the mold third part (114) are respectively α1 and α2, and the values of α1 and α2 are both in the range of 0°-90°.

6. A seal assembly with lubrication effect according to claim 3, characterized in that, The inner side wall of the cylindrical part (2) is composed of a first plane (21), a second plane (22) and a third plane (23), the first plane (21) is connected with the third plane (23) through the second plane (22), the first plane (21) and the third plane (23) are both in abutment with or separation from the end face sealing mold (1) through the gasket ring (3), and the second plane (22) is arranged in parallel with the outer side wall of the cylindrical part (2).

7. A sealed assembly with lubricating effect according to claim 6, characterized in that The first plane (21) and the third plane (23) are both inclined planes, and the inclination angles of the first plane (21) and the third plane (23) are respectively equal to the taper angles α2 of the frustocone of the mold third part (114) and the taper angles α1 of the frustocone of the lower end face sealing mold (12).

8. The sealed assembly with lubricating effect according to claim 1, characterized in that, The gasket ring (3) is a metal gasket ring, and the metal gasket ring is a thin-walled annular part.

9. A sealed assembly with lubricating effect according to claim 8, characterized in that, The material of the metal gasket ring is red copper.

10. The sealed assembly with lubricating effect according to claim 6, characterized in that, The gasket ring (3) comprises a gasket one ring (31), a gasket two ring (32) and a gasket three ring (33), the gasket one ring (31) is connected with the gasket two ring (32) and the gasket three ring (33) through the gasket two ring (32); the bottom side or the top side of the gasket one ring (31) is arranged in abutment with the top or the bottom of the cylindrical part (2), one side of the gasket two ring (32) is arranged in abutment with the first plane (21) or the third plane (23) of the cylindrical part (2), the other side of the gasket two ring (32) is in abutment with or separation from the frustocone of the upper end face sealing mold (11) or the lower end face sealing mold (12), and the outer side of the gasket three ring (33) is arranged in abutment with the second plane (22) of the cylindrical part (2).

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