Double-seal sealing gasket for end face

Abstract

The invention discloses a double-seal sealing gasket for an end face, and belongs to the technical field of sealing devices. The framework is made of metal materials and is annular, and a first annular groove is formed in the annular inner side of the framework; the sealing sleeve is made of an elastic material and is annular, the sealing sleeve is arranged on the annular inner side of the framework in a sleeving mode, the annular outer edge is located in the first annular groove and matched with the first annular groove, and the annular inner edge of the sealing sleeve protrudes out of the two axial end faces of the framework and inwards protrudes out of the annular inner side of the framework. The advantages of hard sealing and soft sealing are combined, complementary advantages are formed, the sealing force is larger, soft sealing is mainly used under the low-pressure condition, soft sealing and hard sealing work at the same time under the high-pressure condition, the end face can be effectively sealed, different sealing effects can be achieved under different pressures, and through the self-tightening type sealing mode and the double-sealing mode, the sealing effect is good, and the sealing effect is good. The sealing gasket is also resistant to high temperature, has high sealing performance in high-temperature and high-pressure complex environments, and can be widely applied to multiple fields.

Description

Technical Field

[0001] The present application belongs to the technical field of sealing devices, and in particular relates to a sealing gasket with double sealing for end faces. Background Art

[0002] The quality of sealing technology is directly related to whether key equipment can operate normally. It is widely used in many industries. As the core component of sealing technology, seals directly determine the quality of sealing performance. In the context of new process innovation, high requirements are placed on the sealing performance of seals: seals need to face reliability issues such as high temperature resistance, high pressure, and strong corrosion. Once the seal fails, it will not only affect the normal operation of the system, but may also cause major safety accidents and environmental impacts.

[0003] Seals generally include two types: hard seals and soft seals. For example, sealing gaskets are one of the key components of seals and play a key role in sealing. Figure 1 and Figure 2 There are three types of sealing gaskets: metal, non-metal and combined. Metal sealing gaskets have good chemical compatibility, high temperature resistance and pressure bearing characteristics under high temperature and high pressure conditions. Their sealing method is called hard sealing. However, they require a lot of sealing force when sealing and cannot be self-tightened, so they are expensive. Non-metallic gaskets can use their own expansion and deformation characteristics under the action of external pressure to compensate for the gap between components, thereby achieving the purpose of sealing. Their sealing method is called soft sealing. There are also sealing gaskets that combine metal and non-metal, which are also a combination of hard sealing and soft sealing.

[0004] However, the seals of the prior art have poor end face sealing performance under high-pressure working conditions, and the seals are prone to failure. Although there are sealing devices, their structures are relatively complex and the manufacturing costs are high. Moreover, under different pressure conditions, the existing seals cannot always maintain good sealing performance, such as during the pressure change process from low pressure to high pressure, or high pressure to low pressure. On the other hand, under high-temperature working conditions, the sealing performance of the seals will also be affected, and when the temperature changes, the seals are also prone to loose sealing. In summary, the sealing performance of the existing seals is affected in complex environments such as high temperature and high pressure, and they cannot maintain a good seal. Summary of the invention

[0005] The present application aims to solve the technical problem of sealing under high-pressure conditions at least to a certain extent. To this end, the present application provides a double-sealed sealing gasket for the end face, which combines the advantages of both hard sealing and soft sealing types to form complementary advantages and greater sealing force. Under high-pressure environments, the end face can be effectively sealed and has strong sealing performance.

[0006] The embodiment of the present application provides a sealing gasket with double sealing for end face, which comprises:

[0007] The frame is made of metal material and is in a ring shape. A first ring groove is provided on the inner side of the ring of the frame;

[0008] The sealing sleeve is made of elastic material and is annular. The sealing sleeve is arranged on the inner side of the ring of the skeleton by means of a sleeve arrangement. The outer edge of the sealing sleeve is located in the first annular groove and matches the first annular groove. The inner edge of the sealing sleeve protrudes axially from the two axial end surfaces of the skeleton and radially inwardly from the inner side of the ring of the skeleton.

[0009] In an optional embodiment, the groove wall of the first annular groove has two inclined surfaces arranged opposite to each other, so that after the sealing sleeve is subjected to force, the outer edge of the ring can act on the frame radially outward along the two inclined surfaces.

[0010] In an optional embodiment, the angle between the two inclined surfaces is an acute angle, and the angle between the inclined surface and the axial end surface of the skeleton is an acute angle.

[0011] In an optional embodiment, a second annular groove is provided on the inner edge of the sealing sleeve so that the sealing sleeve forms two axially opposite extensions, which extend along the groove wall of the first annular groove and protrude from the axial end surface of the skeleton, with an angle between the two extensions.

[0012] In an optional embodiment, the ends of the two extension portions can approach each other under the force from the two axial end surfaces, so as to seal the two axial end surfaces of the sealing sleeve.

[0013] In an optional embodiment, the axial cross-section of the sealing sleeve is in two opposite V-shapes.

[0014] In an optional embodiment, the hardness of the elastic material is greater than or equal to 50 Shore hardness and less than or equal to 90 Shore hardness.

[0015] In an optional embodiment, the metal material is a metal material with a temperature resistance of 200 to 350 degrees Celsius.

[0016] In an optional embodiment, the elastic material is an elastic material having a temperature resistance of 200 to 350 degrees Celsius.

[0017] In an optional embodiment, the sealing sleeve is molded on the groove wall of the first annular groove, so that the sealing sleeve is connected to the frame to form an integral body.

[0018] It can be seen from the above technical solution that the beneficial effects of this application are:

[0019] The present application provides a hard seal through the skeleton, which can seal the end faces that act and contact up and down, and provides a soft seal through the sealing sleeve to seal the two axial end faces, further improving the end face sealing effect. In this way, the advantages of both hard seals and soft seals are combined to form complementary advantages. By providing seals on both axial end faces of the overall structure, the sealing effect is effectively enhanced. The sealing sleeve is placed in the first annular groove, and the inner edge of the sealing sleeve protrudes from the skeleton. In this way, when the inner edge of the sealing sleeve is affected by the axial end faces of the skeleton, the sealing sleeve can be squeezed to deform and tightly adhere to the two end faces, and the seals from the two axial ends of the skeleton can be utilized. The external force on the end face, and the high-pressure liquid acts on the sealing sleeve during use, applying a radial outward force to the skeleton through the sealing sleeve, which can also make the outer ring of the skeleton seal tighter, thus forming a self-tightening seal. At the same time, after the sealing sleeve is deformed, the sealing sleeve is subjected to the force from the two axial end faces. As the pressure increases, the inner edge of the sealing sleeve fits more closely with the contacted end face, thereby enhancing the sealing effect. In this way, the sealing force of the double-sealed sealing gasket of the entire end face is increased, thereby enhancing the sealing performance. The self-tightening seal is more reliable and has a greater sealing force. Under high-pressure conditions, the end face can be effectively sealed and has a strong sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other embodiments and drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A cross-sectional view of a conventional sealing gasket is shown;

[0022] Figure 2 A cross-sectional view of a conventional sealing gasket is shown;

[0023] Figure 3 A cross-sectional view of an embodiment of a sealing gasket with double seals for end faces of the present invention is shown;

[0024] Figure 4 A schematic diagram showing an initial application state of a sealing gasket with double seals for end faces according to an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of an embodiment of the skeleton of the present invention is shown;

[0026] Figure 6 A schematic diagram of an embodiment of the sealing sleeve of the present invention is shown;

[0027] Figure 7A partial schematic diagram of the force applied to the sealing gasket with double seals on the end face of the present invention is shown;

[0028] Figure 8 A partial schematic diagram of the force applied to the sealing gasket with double seals on the end face of the present invention is shown;

[0029] Fig. 9 A schematic diagram showing a pressure-applied state of a sealing gasket with double seals for end faces according to an embodiment of the present invention;

[0030] Figure numerals: 100, sealing gasket with double seal on the end face; 110, skeleton; 111, inner side of the ring; 112, outer side of the ring; 113, first annular groove; 114, inclined surface; 120, sealing sleeve; 121, outer edge of the ring; 122, inner edge of the ring; 123, second annular groove; 200, cover body; 300, shell. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0036] Please refer to Figure 3 In the first aspect of the present application, a double-sealed sealing gasket 100 for an end face is provided, which includes a skeleton 110 and a sealing sleeve 120. The skeleton 110 and the sealing sleeve 120 both adopt an annular structure. The sealing sleeve 120 is located on the inner side 111 of the skeleton 110. The skeleton 110 is used to seal its two axial end faces and the outer side of the ring. The outer side 112 of the skeleton 110 is a cylindrical surface. The skeleton 110 is made of a metal material and has a high rigidity feature. Metal materials such as stainless steel, aluminum alloy, etc. have a high elastic modulus, high strength and high rigidity. The skeleton 110 has the characteristics of degree, and a first annular groove 113 is provided, and the first annular groove 113 is located on the inner side of the skeleton 110; the sealing sleeve 120 is used to seal the two axial end faces thereof, and the inner edge 122 of the sealing sleeve 120 is used to contact and seal the end faces acted on and contacted, and the sealing sleeve 120 is made of elastic material, and the elastic material includes rubber, synthetic rubber, etc., and has a certain elasticity. The sealing sleeve 120 is arranged on the inner side 111 of the skeleton 110 through a shaft sleeve matching method, that is, the skeleton 110 is sleeved on the outer edge 121 of the sealing sleeve 120.

[0037] Please refer to Figure 4The inner edge 122 of the sealing sleeve 120 protrudes from the two axial end surfaces of the skeleton 110, and the inner edge 122 of the sealing sleeve 120 protrudes in a direction perpendicular to the radial direction and protrudes from the two axial end surfaces of the skeleton 110, while the outer edge 121 protrudes radially inward from the inner side 111 of the skeleton 110, thereby providing a force basis for the sealing sleeve 120 for the external force, and the external force can compress and deform the sealing sleeve 120 in the axial direction by acting on the raised portion of the sealing sleeve 120, and the outer edge 121 of the sealing sleeve 120 matches the first annular groove 113, and the outer edge 121 of the sealing sleeve 120 is always in close contact with the inner side 111 of the skeleton 110. The present application can be used for sealing pressure vessels, such as when the sealing gasket is placed at the stuffing box of the shell 300 of the pressure vessel, the upper end face of the sealing sleeve 120 fits with the bottom of the cover body 200, the lower end face of the sealing sleeve 120 fits tightly with the bottom wall of the groove of the shell 300, the outer ring side 112 of the skeleton 110 fits with the groove wall of the shell 300 to form a hard seal, and the two axial end faces of the skeleton 110 fit with the bottom of the cover body 200 and the bottom wall of the groove of the shell 300 to form a hard seal. Under the pre-tightening force of the cover body 200, the sealing sleeve 120 is elastically deformed and compressed, so that the sealing sleeve 120 fits more closely with the cover body 200 and the shell 300, the sealing force is greater, the sealing effect is better, and a self-tightening seal is formed.

[0038] The seals of the prior art are not suitable for high temperature and high pressure environments, have poor sealing performance, and are prone to failure. Soft seals are prone to aging and plastic deformation under high temperature and high pressure conditions, and their service life is relatively short. Hard seals are prone to wear and tear at the sealing point under high temperature and high pressure conditions, which is caused by the interaction of rigid contact, resulting in poor sealing. However, the present application provides a hard seal through the skeleton 110, which can seal the end faces that act and contact up and down, and provides a soft seal through the sealing sleeve 120 to seal the two axial end faces, further improving the end face sealing effect. In this way, the advantages of both hard and soft seals are combined to form complementary advantages. By providing seals on both axial end faces of the overall structure, the sealing effect is effectively enhanced. The sealing sleeve 120 is placed in the first annular groove 113, and the inner edge 122 of the sealing sleeve 120 protrudes from the skeleton 110. In this way, when the inner edge 122 of the sealing sleeve 120 is affected by the axial end faces of the skeleton 110, it can squeeze the sealing sleeve 120, causing the sealing sleeve 120 to deform and tightly adhere to the two end faces, and can utilize the sealing sleeve 120 from the axial end faces of the skeleton 110. The external forces on the two axial end faces of the skeleton 110, and the high-pressure liquid acting on the sealing sleeve 120 during use, apply radial outward force to the skeleton 110 through the sealing sleeve 120, which can also make the outer ring of the skeleton 110 seal tighter, thus forming a self-tightening seal. At the same time, after the sealing sleeve 120 is deformed, the sealing sleeve 120 is subjected to the forces from the two axial end faces. As the pressure increases, the inner edge 122 of the ring of the sealing sleeve 120 fits more closely with the contacted end face, thereby enhancing the sealing effect. In this way, the sealing force of the double-sealed sealing gasket of the entire end face is increased, thereby enhancing the sealing performance. The self-tightening seal is more reliable and has a greater sealing force. Under high-pressure environment, the end face can be effectively sealed and has a strong sealing performance.

[0039] Please refer to Figure 5In an optional embodiment, the groove wall of the first annular groove 113 has two inclined surfaces 114 arranged opposite to each other, that is, the two inclined surfaces 114 are located inside the skeleton 110 forming the first annular groove 113, and the two inclined surfaces 114 are located on both sides of the groove. Since the inner edge 122 of the ring of the sealing sleeve 120 is protruding, when the inner edge 122 of the ring of the sealing sleeve 120 is subjected to the relative force from the two axial end faces of the skeleton 110, the sealing sleeve 120 can generate stress components outward along the two inclined surfaces 114 and act on the skeleton 110. It can be seen from the force analysis of the sealing sleeve 120 that as shown in the figure, the upper and lower end faces of the sealing sleeve 120 are subjected to force, squeezing the sealing sleeve 120, so that the sealing sleeve 120 is deformed, and at the same time, the sealing sleeve 120 generates force on the upper and lower covers and the shell due to the force, so as to form a self-tightening end face seal. In an optional embodiment, there is an acute angle between the two inclined surfaces 114, and the two inclined surfaces 114 have acute angles with the two axial end faces of the skeleton 110. In an optional embodiment, the depth of the first annular groove 113 is greater than or equal to half the width of the sealing sleeve 120, that is, half of the difference between the outer diameter and the inner diameter of the sealing sleeve 120 is less than or equal to the depth of the first annular groove 113, so that more than half of the sealing sleeve 120 is placed in the first annular groove 113. This design allows the sealing sleeve 120 to be better constrained on the inner side of the skeleton 110.

[0040] Please refer to Figure 6In an optional embodiment, a second annular groove 123 is recessed on the inner side of the sealing sleeve 120, so that the sealing sleeve 120 forms two opposite extensions, that is, two extensions opposite to each other in the figure, the two extensions are both annular, and the relative and opposite surfaces of the two extensions are inclined. The extensions extend from the inner side of the skeleton 110 along the groove wall of the first annular groove 113 and protrude from the axial end surfaces of the skeleton 110. There is an acute angle between the two extensions, one extension extends along the inclined surface 114 toward the inner side of the sealing sleeve 120, and the other extension extends along the other inclined surface 114 toward the inner side of the sealing sleeve 120. The two extensions are arranged as above, so that when the sealing sleeve 120 is subjected to force at the inner edge 122 of the ring, the two extensions generate stress components along their own inclined directions, which are constrained by the skeleton 110 and also receive a certain support from the skeleton 110, so that a self-tightening seal can be effectively formed at the axial end surface. In an optional embodiment, the sealing sleeve 120 is formed on the inner side 111 of the ring of the skeleton 110, so that the outer edge 121 of the sealing sleeve 120 is attached to the inner side 111 of the ring of the skeleton 110, so that the sealing sleeve 120 and the skeleton 110 are connected to form a whole through the contact surface of the two, that is, the outer edge 121 of the sealing sleeve 120 can be tightly attached to the first annular groove 113 on the inner side of the skeleton 110. A layer of annular structure can be vulcanized on the inner side 111 of the ring of the already formed skeleton 110 to form the above-mentioned sealing sleeve 120, or a strong glue can be used to connect the contact surface between the outer edge 121 of the sealing sleeve 120 and the inner side of the skeleton 110, or other settings with stronger forces can be used, so that the sealing sleeve 120 and the skeleton 110 can be tightly combined as a whole, and the sealing effect is also ensured.

[0041] In an optional embodiment, the end of the extension portion serves as the inner ring edge 122 of the sealing sleeve 120. After the second annular groove 123 is provided, the remaining portion of the sealing sleeve 120 forms an annular end on the inside, which is the inner ring edge 122 of the sealing portion. In this way, the sealing sleeve 120 forms two inner ring edges 122 that are opposite to each other as shown in the figure. When the two axial end faces of the skeleton 110 are acted upon, the ends of the two extension portions approach each other, that is, when the two annular inner ring edges 122 approach each other in opposite directions, they react on the contacted end faces and are also supported by the skeleton 110 along the inclined direction, thereby achieving a stronger sealing effect.

[0042] Please refer to Figure 7 and Figure 8In an optional embodiment, the second annular groove 123 is V-shaped on the inner side of the sealing sleeve 120, so that the sealing sleeve 120 is V-shaped with two openings facing each other in the axial section, that is, in the axial section of the sealing sleeve 120, the sealing sleeve 120 is two opposite V-shaped. As shown in one side of the figure, the structure of the sealing sleeve 120 is V-shaped. With this structure, the sealing sleeve 120 can effectively seal the two end surfaces; the proportion of the inner edge 122 of the sealing sleeve 120 protruding radially inwardly from the inner side 11 of the skeleton 110 accounts for [1 / 3, 1 / 2] of the sealing sleeve 120, such as 1 / 3 or 1 / 2, and the proportion of the inner edge 122 of the sealing sleeve 120 protruding axially outwardly from the axial end surface of the skeleton 110 accounts for [1 / 3, 1 / 2] of the sealing sleeve 120, such as 1 / 3 or 1 / 2. By setting the above proportions, the sealing sleeve 120 can seal the end surface more tightly when subjected to radial force. Through the structural form of the above-mentioned sealing sleeve 120, the greater the external force, the greater the sealing force of the sealing gasket. Even if leakage occurs, the sealing sleeve 120 will produce elastic deformation under the force of the external medium, thereby increasing the sealing between the sealing gasket and the cover body 200, and the sealing gasket and the shell 300, thereby realizing a self-tightening seal.

[0043] In an optional embodiment, the hardness of the elastic material of the sealing sleeve 120 is greater than or equal to 50 Shore hardness and less than or equal to 90 Shore hardness. The selection of the elastic material is also a factor that enables the sealing sleeve 120 to have a sealing effect and a good sealing effect. The hardness of the elastic material cannot be too large, otherwise the elastic material is not easy to deform, and thus cannot have a strong force at the inner edge 122 and the outer edge 121 of the ring. The hardness of the elastic material cannot be too small, otherwise the stress of the sealing sleeve 120 cannot be effectively transmitted to the outer edge 121 of the ring, and it is easy to fail to seal at the inner edge 122 of the sealing sleeve 120. With the above hardness, the sealing sleeve 120 can maintain a strong sealing effect when deformed. In an optional embodiment, the skeleton 110 is a metal material with a temperature resistance of 200 to 350 degrees Celsius, such as the skeleton 110 is made of 316L stainless steel that is resistant to high temperature and high pressure. The metal material also has the effect of corrosion resistance. In an optional implementation manner, the sealing sleeve 120 is made of an elastic material having a temperature resistance of 200 to 350 degrees Celsius, such as the sealing sleeve 120 is made of high temperature resistant PEK, fluororubber, silicone rubber, etc.

[0044] Please refer to Fig. 9The present application has a compact structure, combining the skeleton 110 as a hard seal and the sealing sleeve 120 as a soft seal, achieving the effect of double sealing, maintaining strong sealing performance through self-tightening, and the greater the external force, the greater the sealing force. Under low-pressure conditions, soft sealing is mainly used; under high-pressure conditions, soft and hard seals work at the same time. Even if the soft sealing area fails, such as crushing, under the action of greater external pressure, the hard seal can maintain sufficient sealing performance, playing a double insurance effect. The special structural form adopted by the sealing sleeve 120 avoids the phenomenon that the cover body 200 squeezes the sealing sleeve 120 under greater pressure, resulting in the breaking of the sealing body; equally important, the sealing gasket of the present application can achieve different sealing effects under different pressures, greatly improve the sealing performance, and can be used in high-temperature and high-pressure environments, and can be applied to many fields to promote the development of my country's industry.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "optional example" or "optional implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0046] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0047] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A sealing gasket with double seals for end faces, characterized in that: include: A frame (110) is made of a metal material, the frame (110) is ring-shaped, and a first ring-shaped groove (113) is provided on the inner side (111) of the frame (110); The sealing sleeve (120) is made of an elastic material and is annular in shape. The sealing sleeve (120) is sleeved on the inner side (111) of the ring of the skeleton (110). The outer edge (121) of the sealing sleeve (120) is located in the first annular groove (113) and matches the first annular groove (113). The inner edge (122) of the sealing sleeve (120) protrudes axially from the two axial end faces of the skeleton (110) and radially inwardly from the inner side (111) of the ring of the skeleton (110).

2. The double-sealed sealing gasket for end faces according to claim 1, characterized in that: The groove wall of the first annular groove (113) has two inclined surfaces (114) arranged opposite to each other, so that when the sealing sleeve (120) is subjected to force, the outer edge (121) of the ring can act on the frame (110) outwardly in the radial direction along the two inclined surfaces (114).

3. The double-sealed sealing gasket for end faces according to claim 2, characterized in that: The angle between the two inclined surfaces (114) is an acute angle, and the angle between the inclined surface (114) and the axial end surface of the skeleton (110) is an acute angle.

4. The double-sealed sealing gasket for end faces according to any one of claims 1 to 3, characterized in that: The inner ring edge (122) of the sealing sleeve (120) is provided with a second annular groove (123), so that the sealing sleeve (120) forms two axially opposite extension parts, the extension parts extend along the groove wall of the first annular groove (113) and protrude from the axial end surface of the skeleton (110), and an angle is formed between the two extension parts.

5. The double-sealed sealing gasket for end faces according to claim 4, characterized in that: The ends of the two extension parts can approach each other under the action of forces from the two axial end surfaces, so as to seal the two axial end surfaces of the sealing sleeve (120).

6. The double-sealed sealing gasket for end faces according to claim 4, characterized in that: The axial cross-section of the sealing sleeve (120) is in the form of two opposite V-shapes.

7. The double-sealed sealing gasket for end faces according to claim 1, characterized in that: The hardness of the elastic material is greater than or equal to 50 Shore hardness and less than or equal to 90 Shore hardness.

8. The double-sealed sealing gasket for end faces according to claim 7, characterized in that: The metal material is a metal material with a temperature resistance of 200 to 350 degrees Celsius.

9. The double-sealed sealing gasket for end faces according to claim 7, characterized in that: The elastic material is an elastic material with a temperature resistance of 200 to 350 degrees Celsius.

10. The double-sealed sealing gasket for end face according to any one of claims 1-3 and 7-9, characterized in that: The sealing sleeve (120) is molded on the groove wall of the first annular groove (113), so that the sealing sleeve (120) and the frame (110) are connected to form an integral body.

Images