Double-seal sealing gasket for shaft hole

Abstract

The invention discloses a double-seal sealing gasket for a shaft hole, and belongs to the technical field of sealing devices. The framework is made of a metal material, is in an annular shape and is provided with a first annular groove; and the sealing sleeve is made of an elastic material, is annular, is embedded in the first annular groove, is located in the first annular groove and is matched with the first annular groove, the sealing sleeve is provided with an annular outer edge and an annular inner edge, the annular outer edge and the annular inner edge protrude out of the second axial end face of the framework in the axial direction, the annular inner edge protrudes out of the annular inner side of the framework, and the annular outer edge protrudes out of the annular outer side of the framework. According to the sealing gasket, the advantages of hard sealing and soft sealing are combined, complementary advantages are formed, the sealing force is larger, the shaft hole can be effectively sealed, different sealing effects can be achieved under different pressures, the sealing gasket is resistant to high temperature through a self-tightening sealing mode and a double-sealing mode, the sealing gasket has high sealing performance in the high-temperature and high-pressure complex environment, and the service life of the sealing gasket is prolonged. The method 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 double-sealed sealing gasket for an axial hole. Background Art

[0002] The quality of sealing technology is crucial to ensure the stable operation of key equipment, and it is widely used in many industries. Seals, as the core component of sealing technology, are directly related to the quality of sealing. With the continuous emergence of new technologies, the requirements for the sealing performance of seals are becoming more and more stringent: seals must be able to withstand high temperatures, high pressures and highly corrosive environments to ensure their reliability. Once a seal fails, it will not only hinder the normal operation of the system, but in serious cases it may even cause major safety accidents and environmental damage.

[0003] Seals are mainly divided into two categories: hard seals and soft seals. Take the sealing gasket as an example. As a key part of the seal, it plays a vital role in the sealing process. Figure 1 and Figure 2 As shown, sealing gaskets can be divided into three types: metal, non-metal and combined. Metal sealing gaskets exhibit excellent chemical stability, high temperature resistance and pressure bearing properties under high temperature and high pressure conditions, and belong to the hard sealing type; however, they require a large external force to seal and cannot be automatically tightened, and the manufacturing cost is relatively high. Non-metallic gaskets use their own expansion and deformation capabilities under external pressure to fill the tiny gaps between components and achieve sealing. This type of sealing is called soft sealing. In addition, there are sealing gaskets that combine metal and non-metallic materials, which have the advantages of both hard sealing and soft sealing.

[0004] However, the seals under the existing technology do not have an ideal sealing effect on the shaft hole under high-pressure conditions and are prone to failure. Although some sealing devices have been launched, their structures are complex and the manufacturing costs are high. At the same time, in the face of pressure changes, whether it is a boost or a depressurization process, it is difficult for existing seals to maintain stable sealing performance. In addition, under high-temperature conditions, the sealing performance of the seal will also be affected. When the temperature fluctuates, the seal is prone to poor sealing. In summary, the sealing performance of existing seals is easily affected in complex environments such as high pressure and high temperature, and it is difficult to maintain an ideal sealing effect. 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 a shaft hole, which combines the advantages of both hard seals and soft seals to form complementary advantages and a greater sealing force. Under high-pressure environments, the shaft hole can be effectively sealed and has a strong sealing performance.

[0006] The embodiment of the present application provides a double-sealed sealing gasket for a shaft hole, which includes:

[0007] The frame is made of metal material and is annular in shape. A first annular groove is provided on a first axial end surface of the frame.

[0008] The sealing sleeve is made of elastic material and is annular. The sealing sleeve is embedded in the first annular groove. The axial first end of the sealing sleeve is located in the first annular groove and matches the first annular groove. The axial second end of the sealing sleeve forms an outer ring edge and an inner ring edge on the radial outside and inside respectively. The outer ring edge and the inner ring edge protrude axially from the second axial end face of the skeleton, and the inner ring edge protrudes radially inwardly from the inner ring side of the skeleton, and the outer ring edge protrudes radially outwardly from the outer ring side 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 the outer edge of the ring can extend radially outward along one inclined surface, and the inner edge of the ring can extend radially inward along the other inclined surface.

[0010] In an optional embodiment, the angle between the two inclined surfaces is an acute angle, and the angles between the inclined surfaces and the inner side and the outer side of the ring of the skeleton are acute angles.

[0011] In an optional embodiment, a second annular groove is provided at the second axial end of the sealing sleeve to form an outer ring edge and an inner ring edge, and an angle is formed between the outer ring edge and the inner ring edge.

[0012] In an optional embodiment, the outer edge of the ring and the inner edge of the ring can be separated from each other under the force from the two axial end surfaces, so as to synchronously seal the radial outer side and the radial inner side of the sealing sleeve.

[0013] In an optional embodiment, the axial cross-section of the sealing sleeve is in two symmetrical V-shapes or Λ-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 be in contact with the outside in the axial direction to seal the inner and outer sides of the ring in the radial direction, and provides a soft seal through the sealing sleeve, which can seal the radial inner and radial outer sides of the sealing sleeve, further improving the sealing effect of the shaft hole. In this way, the advantages of the two types of hard seals and soft seals are combined to form complementary advantages. By providing seals on both the inner and outer sides 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 and outer edges of the sealing sleeve are acted upon by the two end faces in the axial direction, the sealing sleeve can be squeezed to make the sealing sleeve It deforms radially outward and radially inward. When used, high-pressure liquid acts on the sealing sleeve, which can also cause the inner edge of the sealing sleeve to tend inward and the outer edge of the sealing sleeve to tend outward, making the seal tighter and forming a self-tightening seal. At the same time, after the sealing sleeve is deformed, as the pressure from the axial end face increases, the inner edge of the sealing sleeve and the outer edge of the sealing sleeve fit more closely with the contact surface, thereby enhancing the sealing effect. In this way, the sealing force on the radial inside and radial outside of the sealing gasket 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 shaft hole 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 double-sealed sealing gasket for a shaft hole of the present invention is shown;

[0024] Figure 4 A schematic diagram of an application of a double-sealed sealing gasket for a shaft hole according to the present invention is shown;

[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 7 A schematic diagram of local force in the embodiment of the double-sealed sealing gasket for the shaft hole of the present invention is shown;

[0028] Figure 8 A schematic diagram of an application of a double-sealed sealing gasket for a shaft hole according to the present invention is shown;

[0029] Figure numerals: 100, double-sealed sealing gasket for axial hole; 110, skeleton; 111, inner side of ring; 112, outer side of ring; 113, first annular groove; 114, inclined surface; 115, first axial end face; 116, second axial end face; 120, sealing sleeve; 121, outer edge of ring; 122, inner edge of ring; 123, second annular groove; 124, first axial end; 125, second axial end; 200; valve stem; 300, valve body; 400, pressure cover. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0035] Please refer to Figure 3 In a first aspect of the present application, a double-sealed sealing gasket 100 for a shaft hole 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 at the end face of the skeleton 110. The skeleton 110 is used for sealing in the radial direction. The inner side 111 and the outer side 112 of the skeleton 110 are cylindrical surfaces. 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 the characteristics of high elastic modulus, high strength and high rigidity. The skeleton 110 The first axial end face 115 is recessed with a first annular groove 113, that is, the first annular groove 113 is located on the end face of the skeleton 110; the sealing sleeve 120 is used to seal the radial inner and outer sides thereof, and the inner edge 122 of the sealing sleeve 120 is used to contact and seal the circumference of the cylindrical structure installed on the inner side thereof, such as the sealing valve stem 200, and the outer edge 121 of the sealing sleeve 120 is used to contact and seal the inner wall of the circular groove of the structure installed on the outer side thereof, such as the sealing valve body 300, and the sealing sleeve 120 is made of an elastic material, and the elastic material includes rubber, synthetic rubber, etc., and has a certain elasticity.

[0036] Please refer to Figure 4 The sealing sleeve 120 is embedded in the first annular groove 113. The axial first end 124 and the axial second end 125 of the sealing sleeve 120 are the two axial ends of the sealing sleeve 120 respectively. The axial first end 124 matches the groove wall of the first annular groove 113, and the axial second end 125 forms a ring outer edge 121 and a ring inner edge 122 on the radial outer side and the inner side respectively. The ring outer edge 121 and the ring inner edge 122 protrude from the second axial end face 116 of the skeleton 110. At the same time, the ring inner edge 122 The ring inner side 111 protrudes from the skeleton 110 in the radial inner direction, and the ring outer edge 121 protrudes from the ring outer side 112 of the skeleton 110 in the radial outer direction, so that the ring outer edge 121 and the ring inner edge 122 can both be deformed under the force in the end direction, so that the sealing sleeve 120 is deformed radially inward and radially outward, so that the ring outer edge 121 fits tightly to the outside, and the ring inner edge 122 fits tightly to the inside, and at the same time, the axial second end 125 of the sealing sleeve 120 fits tightly to the contact surface. The present application can be used for sealing pressure vessels. For example, the sealing gasket is placed between the valve body 300 and the valve stem 200 of the pressure vessel. The inner edge 122 of the sealing sleeve 120 fits with the valve stem 200 to form a soft seal. The outer edge 121 of the sealing sleeve 120 fits with the groove wall of the valve body 300 to also form a soft seal. Under the pre-tightening force of the pressure cover 400, the sealing sleeve 120 produces elastic deformation and deforms toward the inside and outside of the sealing gasket, so that the inner edge 122 of the ring and the valve stem 200, and the outer edge 121 of the ring and the groove of the valve body 300 fit more closely, the sealing force is greater, the sealing effect is better, and a self-tightening seal is formed.

[0037] The seals of the prior art are not suitable for high temperature and high pressure environments, have poor sealing performance, and are prone to seal 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. The present application provides a hard seal through the skeleton 110, which can contact the outside in the axial direction to seal the inner side 111 and the outer side 112 of the ring in the radial direction. The soft seal is provided by the sealing sleeve 120, which can seal the radial inner side and the radial outer side of the sealing sleeve 120, further improving the sealing effect of the shaft hole. In this way, the advantages of the two types of hard seals and soft seals are combined to form complementary advantages. By providing seals on both the inner and outer sides 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. In this way, when the inner edge 122 and the outer edge 121 of the sealing sleeve 120 are affected by the axial end faces, the sealing sleeve 120 deforms radially outward and radially inward. At the same time, when in use, high-pressure liquid acts on the sealing sleeve 120, which can also cause the inner edge 122 of the sealing sleeve 120 to tend inward and the outer edge 121 to tend outward, so that the seal is tighter and a self-tightening seal is formed. At the same time, after the sealing sleeve 120 is deformed, as the pressure from the axial end face increases, the inner edge 122 of the sealing sleeve 120 and the outer edge 121 of the sealing sleeve 120 fit more closely with the contacted surface, thereby enhancing the sealing effect. In this way, the sealing force on the radial inner side and radial outer side of the sealing gasket 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 shaft hole can be effectively sealed and has a strong sealing performance.

[0038] 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 on the second axial end surface 116 of the skeleton 110 forming the first annular groove 113, and the two inclined surfaces 114 are respectively located on both sides of the groove. Since the outer edge 121 and the inner edge 122 of the sealing sleeve 120 are protrudingly arranged, when the outer edge 121 and the inner edge 122 of the sealing sleeve 120 are subjected to relative forces from the two axial end surfaces of the skeleton 110, the sealing sleeve 120 It is possible to generate stress components along the two inclined surfaces 114 into the first annular groove 113 and act on the skeleton 110. From the force analysis of the sealing sleeve 120, it can be seen that the upper and lower end surfaces are subjected to force, squeezing the skeleton 110 and the sealing sleeve 120, so that the sealing sleeve 120 is deformed. The sealing sleeve 120 tends to move outward and inward along the direction of the inclined surface 114, causing the outer edge 121 of the sealing sleeve 120 to deform outward, and at the same time, the inner edge 122 of the sealing sleeve 120 to deform inward. In an optional embodiment, there is an acute angle between the two inclined surfaces 114, and there are acute angles between the two inclined surfaces 114 and the inner ring side 111 and the outer ring side 112 of the skeleton 110, respectively. When the above two angles are both acute angles, the stress component along the inclined surface 114 of the sealing sleeve 120 after being subjected to force is larger, so that the sealing sleeve 120 can effectively convert the force into the force acting on the skeleton 110, so that the first axial end face 115 of the skeleton 110 fits more tightly with the contact surface. In an optional embodiment, the depth of the first annular groove 113 is greater than or equal to half of the thickness of the sealing sleeve 120, that is, half of the thickness 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 thickness of the sealing sleeve 120 is placed in the first annular groove 113. This design allows the sealing sleeve 120 to be better constrained inside the skeleton 110, and the sealing sleeve 120 can effectively transfer stress to the inner skeleton 110 after being subjected to force.

[0039] Please refer to Figure 6In an optional embodiment, the axial second end portion 125 of the sealing sleeve 120 is recessed with a second annular groove 123, so that the sealing sleeve 120 forms two opposite ends: an outer ring edge 121 and an inner ring edge 122, that is, forming the radial inner and outer parts in the figure, the outer ring edge 121 and the inner ring edge 122 are both annular, and the relative and opposite surfaces of the outer ring edge 121 and the inner ring edge 122 are both inclined, the outer ring edge 121 and the inner ring edge 122 extend along the groove wall of the first annular groove 113 and protrude from the second axial end surface 116 of the skeleton 110, there is an acute angle between the outer ring edge 121 and the inner ring edge 122, the inner ring edge 122 extends along the inclined surface 114 toward the radial inner side of the sealing sleeve 120, and the outer ring edge 121 extends along the other inclined surface 114 toward the radial side of the sealing sleeve 120. 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.

[0040] In an optional embodiment, when subjected to the force from the axial end faces of the skeleton 110, the outer edge 121 and the inner edge 122 of the ring are separated from each other, and the radial inner side and the radial outer side of the sealing sleeve 120 are sealed synchronously. As shown in the figure, the gap between the cylindrical valve stem 200 and the sealing sleeve 120 is sealed, and the gap between the groove surface of the valve body 300 and the sealing sleeve 120 is sealed. When the fluid passes through, the fluid exerts a force on the axial second end 125 of the sealing sleeve 120, causing the outer edge 121 and the inner edge 122 of the sealing sleeve 120 to deform, and the inner edge 122 of the ring gradually bends toward and contacts the circumference of the cylindrical valve stem 200, and the outer edge 121 of the ring gradually bends toward and contacts the groove surface of the valve body 300, thereby achieving a stronger sealing effect.

[0041] Please refer to Figure 7In an optional embodiment, the second annular groove 123 is symmetrically V-shaped or Λ-shaped on the cross-section of the sealing sleeve 120, that is, on the axial cross-section of the sealing sleeve 120, as shown on one side of the sealing sleeve 120 in the figure, the structure of the sealing sleeve 120 is V-shaped, and it can also be Λ-shaped when inverted. With this structure, the sealing sleeve 120 can effectively transfer the stress, so that the skeleton 110 can be more tightly sealed with the gland 400, and at the same time, it can also effectively seal the valve stem 200 and the valve body 300; the outer edge 121 and the inner edge 122 of the sealing sleeve 120 protrude from the skeleton in the thickness direction. The ratio of the outer edge 121 of the sealing sleeve 120 protrudes radially outward from the outer side 112 of the skeleton 110, and the ratio of the inner edge 122 of the sealing sleeve 120 protrudes radially inward from the inner side 111 of the skeleton 110, and the ratio of the radial width of the sealing sleeve 120, such as 1 / 3 or 1 / 2, is [1 / 3, 1 / 2], such as 1 / 3 or 1 / 2. By setting the above ratio, the sealing sleeve 120 can more effectively and tightly seal the radial inner side and the radial outer side of the sealing sleeve 120 when the end is subjected to force. Through the structural form of the 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, increase the sealing between the sealing gasket and the valve stem 200, and between the sealing gasket and the valve body 300, and realize self-tightening sealing.

[0042] 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.

[0043] Please refer to Figure 8The present application has a compact structure, and combines the skeleton 110 as a hard seal and the sealing sleeve 120 as a soft seal together, realizing the effect of double sealing, and maintaining strong sealing performance through self-tightening. 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, the hard seal can maintain sufficient sealing performance under the action of large external pressure, playing a double insurance effect. The special structural form adopted by the sealing sleeve 120 avoids the phenomenon that the gland 400 squeezes the sealing sleeve 120 under high pressure and causes the sealing body to break; at the same time, the sealing sleeve 120 can produce radial deformation under the action of pressure, so that the contact between the sealing sleeve 120 and the valve stem 200 and the valve body 300 is tighter, and the sealing effect is also improved. It is also important that 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.

[0044] 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.

[0045] 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.

[0046] 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 double-sealed sealing gasket for an axial hole, characterized in that: include: A skeleton (110) is made of a metal material, the skeleton (110) is annular, and a first annular groove (113) is provided on a first axial end surface (115) of the skeleton (110); The sealing sleeve (120) is made of elastic material and is annular in shape. The sealing sleeve (120) is embedded in the first annular groove (113). The axial first end (124) of the sealing sleeve (120) is located in the first annular groove (113) and matches the first annular groove (113). The axial second end (125) of the sealing sleeve (120) forms an outer ring edge (121) and an inner ring edge (122) on the radial outer side and the inner side, respectively. The outer ring edge (121) and the inner ring edge (122) protrude axially from the second axial end face (116) of the skeleton (110), and the inner ring edge (122) protrudes radially inwardly from the inner ring side (111) of the skeleton (110), and the outer ring edge (121) protrudes radially outwardly from the outer ring side (112) of the skeleton (110).

2. The double-sealed sealing gasket for an axial hole 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 the outer edge (121) of the ring can extend radially outward along one of the inclined surfaces (114), and the inner edge (122) of the ring can extend radially inward along the other of the inclined surfaces (114).

3. The double-sealed sealing gasket for an axial hole according to claim 2, characterized in that: The angle between the two inclined surfaces (114) is an acute angle, and the angles between the inclined surfaces (114) and the inner ring side (111) and the outer ring side (112) of the skeleton (110) are acute angles.

4. The double-sealed sealing gasket for an axial hole according to any one of claims 1 to 3, characterized in that: The second axial end portion (125) of the sealing sleeve (120) is provided with a second annular groove (123) to form the outer ring edge (121) and the inner ring edge (122), and an angle is formed between the outer ring edge (121) and the inner ring edge (122).

5. The double-sealed sealing gasket for an axial hole according to claim 4, characterized in that: The ring outer edge (121) and the ring inner edge (122) can be separated from each other under the action of forces from both axial end surfaces, so as to synchronously seal the radial outer side and the radial inner side of the sealing sleeve (120).

6. The double-sealed sealing gasket for an axial hole according to claim 4, characterized in that: The axial cross-section of the sealing sleeve (120) is in two symmetrical V-shaped or Λ-shaped forms.

7. The double-sealed sealing gasket for an axial hole 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 an axial hole 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 an axial hole 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 an axial hole 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