CN118167794A - Elastic energy storage sealing assembly and mechanical equipment - Google Patents

Abstract

The application provides an elastic energy storage sealing assembly and mechanical equipment. The seal has a first seal portion and a second seal portion in the axial direction. The first seal portion is configured to abut against both the sealed shaft and the sealed body. The elastic piece is positioned in the mounting groove of the sealing piece and is abutted with the side wall of the first sealing part. The second sealing part is positioned below the elastic piece. The second seal portion is configured to be capable of simultaneously abutting against the sealed shaft and the sealed body. The second sealing part is internally provided with a cavity for accommodating a load transmission medium, and the load transmission medium is incompressible medium. The elastic energy storage sealing assembly provided by the application not only enhances the matching degree of the sealing capacity of the elastic energy storage sealing assembly and the pressure which can be borne, but also has the characteristic of double pressure self-tightening while improving the sealing performance of the elastic energy storage sealing assembly.

Description

Elastic energy storage sealing assembly and mechanical equipment

Technical Field

The application relates to the technical field of sealing, in particular to an elastic energy storage sealing assembly and mechanical equipment.

Background

The elastic energy storage sealing component is a sealing component with excellent performance, has the characteristic of pressure self-tightening, and has wide application prospect in ultra-high temperature, ultra-low temperature, corrosive medium working conditions and ultra-high pressure working conditions.

A conventional spring-loaded seal assembly includes a collet and a spring. The jacket has an opening and the spring is mounted in the jacket. The part of the jacket, which is abutted with the spring, is a sealing part of the jacket. When the elastic energy storage sealing component is arranged in the sealed body and is positioned between the sealed body and the sealed shaft, the sealing part is simultaneously abutted with the sealed body and the sealed shaft, so that the sealing function between the sealed body and the sealed shaft is realized. The pressure self-tightening of the elastic energy storage sealing component is realized through a jacket. The greater the pressure of the sealed fluid acting on the jacket, the stronger the sealing performance of the elastic energy storage sealing assembly between the sealed body and the sealed shaft.

However, the sealing capability of the traditional elastic energy storage sealing assembly is not matched with the pressure which can be borne, so that the improvement of the sealing performance of the elastic energy storage sealing assembly is limited.

Disclosure of Invention

The application provides an elastic energy storage sealing assembly and mechanical equipment, which not only enhance the matching degree of the sealing capacity of the elastic energy storage sealing assembly and the pressure which can be borne, but also have the characteristic of double pressure self-tightening while improving the sealing performance of the elastic energy storage sealing assembly.

A first aspect of an embodiment of the present application provides an elastic energy storage seal assembly, including:

An elastic member;

The sealing element is of an annular structure, and is provided with a first sealing part and a second sealing part in the axial direction, and the first sealing part and the second sealing part are connected with each other and form a mounting groove; the first sealing part is configured to simultaneously abut against the sealed shaft and the sealed body; the elastic piece is positioned in the mounting groove and is abutted with the side wall of the first sealing part;

Wherein the second sealing part is positioned below the elastic piece; the second sealing part is configured to be capable of simultaneously abutting against the sealed shaft and the sealed body; the second sealing part is internally provided with a cavity for accommodating a load transmission medium, and the load transmission medium is incompressible medium.

The second sealing part is of an annular structure;

The second seal portion is configured to be capable of expanding and deforming in a radial direction of the seal member by a load transmission medium when in contact with the sealed fluid, and to be simultaneously abutted against the sealed shaft and the sealed body.

The second sealing part is configured to be capable of undergoing compression deformation toward one side in the cavity in the axial direction of the seal member under the pressure of the sealed fluid;

The load transmission medium is configured to be able to transmit the received pressure to the second seal portion when the second seal portion is compressively deformed, so that the second seal portion is distensible deformed in the radial direction of the seal.

In some alternative embodiments, the load transfer medium is a liquid, and the load transfer medium fills the cavity;

The cavity is a sealed cavity in the second sealing part.

In some alternative embodiments, the load transfer medium is a solid, at least a portion of which is disposed within the cavity.

In some alternative embodiments, the cavity is a sealed cavity or an open cavity within the second seal.

In some alternative embodiments, when the cavity is an open cavity, the open cavity is located on a side of the second seal portion remote from the resilient member.

In some alternative embodiments, the load transfer medium comprises an incompressible rubber member.

In some alternative embodiments, the number of cavities is more than one; and/or the number of the groups of groups,

The cavity is an annular cavity, and the cross section of the annular cavity comprises a rectangular shape, a full round shape or a non-full round shape.

In some alternative embodiments, the first sealing portion includes two cantilevers, the two cantilevers are disposed at intervals along the radial direction of the sealing member, and the two cantilevers are abutted against two sides of the elastic member;

The second sealing part is connected to the bottoms of the two cantilevers and surrounds the mounting groove with the two cantilevers; the first seal portion has a larger dimension in the radial direction of the seal than the second seal portion.

A second aspect of an embodiment of the present application provides a mechanical device comprising a sealed body, a sealed shaft, and an elastic energy-storing seal assembly as defined in any one of the above;

The sealed shaft penetrates through the sealed body, the elastic energy storage sealing assembly is arranged between the sealed shaft and the sealed body, and the sealing piece is simultaneously abutted with the sealed shaft and the sealed body.

The application provides an elastic energy storage sealing assembly and mechanical equipment. When the sealed fluid in the mechanical equipment acts on the first sealing part, the sealing pressure of the sealing interface between the first sealing part and the sealed shaft and the sealed body is enhanced, so that the elastic energy storage sealing assembly has a first heavy pressure self-tightening effect at the first sealing part. On the basis, the second sealing part in the sealing element is arranged to realize the second sealing of the sealing element between the sealed shaft and the sealed body. Because the second sealing part is provided with the cavity for accommodating the load transmission medium, and the load transmission medium is incompressible medium, when the sealed fluid acts on the second sealing part, the sealing pressure of a sealing interface between the first sealing part and the sealed shaft and the sealed body can be enhanced due to the incompressible characteristic and the load transmission characteristic of the load transmission medium, so that the elastic energy storage sealing assembly also has a second heavy pressure self-tightening effect at the second sealing part. Therefore, the structure of the sealing element can be fully utilized through the arrangement of the second sealing part, the matching degree of the sealing capacity of the elastic energy storage sealing assembly and the bearing pressure is enhanced, the sealing performance of the elastic energy storage sealing assembly is improved, and meanwhile, the elastic energy storage sealing assembly also has the characteristic of double pressure self-tightening, so that the sealing performance of the elastic energy storage sealing assembly is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.

Fig. 1 is a schematic structural diagram of a first mechanical device according to an embodiment of the present application;

Fig. 2 is a schematic view of a part of a mechanical apparatus having an elastic energy storage seal assembly 3 provided in the related art;

Fig. 3 is a schematic partial structure of a second mechanical device according to an embodiment of the present application;

FIG. 4 is a schematic view of a partial structure of the second seal portion of the second mechanical device of FIG. 3 after deformation;

Fig. 5 is a schematic partial structure of a third mechanical device according to an embodiment of the present application;

fig. 6 is a schematic partial structure of a fourth mechanical device according to an embodiment of the present application.

Reference numerals:

1-a sealed shaft;

2-a sealed body; 21-a bearing platform;

3-an elastic energy storage sealing assembly;

31-jacket; 311-an annular opening; 312-cantilever; 313-seal; 314-root;

32-a spring;

33-seals; 331-a first seal; 332-a second seal; 333-mounting slots;

34-an elastic member;

4-load transmission medium.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The embodiment of the application provides mechanical equipment. Referring to fig. 1, the mechanical device comprises a sealed body 2, a sealed shaft 1 and an elastic energy storage sealing assembly 3. The sealed shaft 1 is arranged in the sealed body 2 in a penetrating way, the elastic energy storage sealing component 3 is arranged between the sealed shaft 1 and the sealed body 2, so that the elastic energy storage sealing component 3 is assembled in a mechanical device, and the sealed shaft 1 and the sealed body 2 are sealed through the elastic energy storage sealing component 3.

The mechanical devices may be engine piston cylinders, hydraulic pumps, hydraulic valves, etc. The structure of the mechanical device is not particularly limited in the present application. For example, when the mechanical device is an engine piston cylinder, the sealed body 2 may be an engine piston cylinder or an engine piston ring. For example, when the mechanical device is a hydraulic valve, the sealed body 2 may be a hydraulic valve seat.

The sealing component is an important structure for ensuring normal operation of mechanical equipment, and is mainly used for controlling leakage behavior of sealed fluid in the mechanical equipment so as to save substances, save energy consumption and reduce cost. As described in the background art, the elastic energy storage sealing component 3 has a wide application prospect in ultra-high temperature, ultra-low temperature, corrosive medium working conditions and ultra-high pressure working conditions due to the characteristic of pressure self-tightening as a sealing component with excellent performance. The pressure self-tightening of the elastic energy storage sealing assembly 3 means that the sealing performance is stronger as the pressure of the sealed fluid is higher, the sealing pressure of the sealing interface of the elastic energy storage sealing assembly 3 in the mechanical equipment is higher.

The elastic energy storage seal assembly 3a shown in fig. 2 is a conventional elastic energy storage seal assembly structure. Fig. 2 only illustrates a partial view of the elastic energy storing seal assembly 3 a.

Referring to fig. 2, the elastic energy storage seal assembly 3a includes a collet 31 and a spring 32 mounted within the collet 31. The springs 32 are typically circumferential springs, that is, the springs 32 are circular in circumferential configuration, rather than conventional linear springs. The jacket 31 has a ring-shaped structure. The jacket 31 is a flexible jacket. The material of the flexible jacket may be plastic. For example, the material of the flexible jacket may be polytetrafluoroethylene (poly tetra fluoroethylene, abbreviated as PTFE), ultra-high molecular weight polyethylene (ultra-high molecular weight polyethylene, abbreviated as UPE), or the like. The jacket 31 has an annular opening 311 therein. The spring 32 is mounted in the annular opening 311.

The jacket 31 has two cantilever arms 312 on both sides at the annular opening 311. The two cantilevers 312 are disposed at intervals in the radial direction of the collet 31 to form a sealing portion 313 of the collet 31. The two cantilevers 312 are abutted against different sides of the elastic member 34. Cantilever 312 may also be referred to as the lip of collet 31, while the bottom of collet 31 at annular opening 311 is referred to as the root 314 of collet 31. The root 314 of the collet 31 is supported at the bottom of the spring 32.

With continued reference to fig. 2, the mechanical device comprises a sealed body 2 and a sealed shaft 1. The sealed body 2 has a base 21 on the side facing the sealed shaft 1. The abutment 21 may comprise, but is not limited to, an annular groove as illustrated in fig. 2. For example, the abutment 21 may also be an "L" shaped channel. In the present application, the structure of the base 21 is not particularly limited.

When the elastic energy storage sealing assembly 3a is installed in the bearing platform 21, the elastic energy storage sealing assembly can be positioned between the sealed body 2 and the sealed shaft 1. When the elastic energy storage sealing assembly 3a is located between the sealed body 2 and the sealed shaft 1, the elastic force generated by the sealing portion 313 due to the assembly interference can simultaneously abut against the sealed body 2 and the sealed shaft 1, so that the elastic energy storage sealing assembly 3a is sealed between the sealed body 2 and the sealed shaft 1.

The contact surface between the sealing part 313 and the sealed body 2 and the sealed shaft 1 is a sealing interface of the elastic energy storage sealing assembly 3 a. The sealed fluid is blocked by the sealing pressure of the sealing interface, so that the sealing effect is realized, and the leakage of the sealed fluid is avoided.

The jacket 31 may be understood as a seal of the elastic energy storing seal assembly 3 a. The pressure self-tightening of the elastic energy storage sealing assembly 3 is realized through the jacket 31. For the elastic energy storage seal assembly 3a, the sealing pressure at the sealing interface mainly comprises the following three parts:

a first portion; the seal 313 has a resilient force due to the fitting interference;

A second portion; the spring 32 has a rebound force due to the assembly interference, and the rebound force generated by the spring 32 acts on the inner side (the opposite side of the two cantilevers 312) of the sealing part 313, so that the sealing pressure of the sealing interface is enhanced;

a third section; when the sealed fluid in the mechanical device flows into the annular opening 311 along the Z direction, the sealed fluid has an enhancing effect on the sealing pressure of the sealing interface.

The third portion is a cause of the jacket 31 to achieve the pressure self-tightening effect. Specifically, as the pressure of the sealed fluid is higher, the sealing pressure to the sealing interface is also higher, and the sealing performance between the sealed body 2 and the sealed shaft 1 is stronger, the sealing performance of the elastic energy storage seal assembly 3a can be better.

With continued reference to fig. 2, the thickness of the cantilever arms 312 in the seal 313 is relatively thin compared to the root 314 of the collet 31, but it is primarily subjected to the pressure of the fluid being sealed, acting as the primary seal. The root 314 of the jacket 31, although thicker, does not substantially seal, nor does it have a "pressure self-tightening effect". Such a jacket 31 is designed with a thinner seal 313 that primarily carries the pressure of the fluid being sealed, while a thicker root 314 is a substantially useless seal, such that the sealing capacity of the spring energy-storing seal assembly 3a does not match the actual pressure that can be carried, limiting the increase in sealing capacity of the spring energy-storing seal assembly 3 a.

To this end, an embodiment of the present application provides an elastic energy storing seal assembly 3, wherein the elastic energy storing seal assembly 3 has a seal 33 therein. The second sealing part 332 and the second sealing part 332 in the sealing piece 33 are provided with the cavity for the load transmission medium 4, so that the structure of the sealing piece 33 can be fully utilized, the sealing capability of the sealing piece 33 can be better exerted, the matching degree of the sealing capability of the elastic energy storage sealing component 3 and the bearing pressure is enhanced, the sealing capability of the elastic energy storage sealing component 3 is improved, and meanwhile, the sealing capability of the elastic energy storage sealing component 3 can be further enhanced due to the characteristic of double pressure self-tightening.

The elastomeric accumulator seal assembly 3 has a seal 33 therein. When the elastic energy storage sealing assembly 3 is installed between the sealed shaft 1 and the sealed body 2, the sealing member 33 is simultaneously abutted against the sealed shaft 1 and the sealed body 2, so that the elastic energy storage sealing assembly 3 seals between the sealed shaft 1 and the sealed body 2.

The structure of the elastic energy storage seal assembly 3 according to the embodiment of the present application will be further described with reference to the drawings and the embodiments.

Referring to fig. 3, the elastomeric accumulator seal assembly 3 includes a seal 33. The seal 33 is of annular configuration to facilitate the assembly of the seal 33 between the sealed shaft 1 and the sealed body 2.

With continued reference to fig. 3, the seal 33 has a first seal portion 331 and a second seal portion 332 in the axial direction. The direction in which the axial direction of the seal 33 is located is parallel to the Z direction, hereinafter referred to as the axial direction of the seal 33. Accordingly, the direction in which the radial direction of the seal 33 is located is parallel to the X direction, hereinafter referred to as the radial direction of the seal 33. Wherein the first sealing portion 331 and the second sealing portion 332 are connected to each other and enclose a mounting groove 333. Illustratively, the first seal portion 331 and the second seal portion 332 may be integrally connected such that the seal 33 is formed as a single piece, and the sealing performance of the seal 33 between the first seal portion 331 and the second seal portion 332 can be ensured while having a high structural strength between the first seal portion 331 and the second seal portion 332. Alternatively, the seal 33 may be of a split type structure without affecting the sealing performance of the seal 33 between the first seal portion 331 and the second seal portion 332.

The structure of the elastic energy storage seal assembly 3 will be further described below by taking the seal 33 as an integral part.

With continued reference to fig. 3, the first seal 331 is configured to simultaneously abut against the sealed shaft 1 and the sealed body 2, so that a first seal can be formed between the sealed shaft 1 and the sealed body 2 within the machine by the arrangement of the first seal 331.

When the elastic energy storage seal assembly 3 is positioned between the sealed shaft 1 and the sealed body 2, the seal 33 has an interference magnitude at the first seal part 331, so that when the elastic energy storage seal assembly 3 is positioned in a mechanical device, the interference fit of the seal 33 at the first seal part 331 can be realized. The first seal 331 can simultaneously contact the sealed shaft 1 and the sealed body 2 by its own resilience.

When the elastic energy storage seal assembly 3 is positioned between the sealed shaft 1 and the sealed body 2, the seal 33 is positioned in the bearing platform 21 of the sealed body 2. The first seal 331 has a dimension in the radial direction of the seal 33 that is larger than the distance L between the sealed shaft 1 and the side wall of the cap 21. The dimension of the first sealing portion 331 in the radial direction of the sealing member 33 can be understood as the maximum distance between the opposite faces of the two cantilevers 312 of the first sealing portion 331. By limiting the size of the first seal 331, it is possible to ensure that the seal 33 has an interference at the first seal 331 when the elastic energy storage seal assembly 3 is located between the sealed shaft 1 and the sealed body 2, to realize the sealing function of the first seal 331.

When the sealed fluid in the mechanical device acts on the first sealing part 331, the sealing pressure of the sealing interface between the first sealing part 331 and the sealed shaft 1 and the sealed body 2 is enhanced, so that the elastic energy storage sealing assembly 3 has a first heavy pressure self-tightening effect at the first sealing part 331.

The seal interface between the first seal 331 and the sealed shaft 1 is an interface formed by a region where the first seal 331 and the sealed shaft 1 are in contact. The sealing interface between the first sealing portion 331 and the sealed body 2 is an interface formed by a region where the first sealing portion 331 and the sealed body 2 are in contact.

With continued reference to fig. 3, the resilient energy storing seal assembly 3 further includes a resilient member 34. The elastic member 34 is located in the mounting groove 333 and abuts against the side wall of the first sealing portion 331, so that the elastic member 34 is disposed in the sealing member 33. When the elastic energy storage sealing assembly 3 is in the mechanical equipment, the elastic piece 34 is in a compressed state in the first sealing part 331 so as to realize interference fit of the elastic piece 34 in the mechanical equipment.

When the elastic member 34 is interference fitted in the machine, the elastic force of the elastic member 34 acts on the side of the first sealing portion 331 facing the elastic member 34, and the sealing pressure of the sealing interface between the first sealing portion 331 and the sealed shaft 1 and the sealed body 2 is enhanced.

The mounting groove 333 is an annular groove. The resilient member 34 may be a circumferential spring as mentioned above or other annular and resilient structure. The elastic member 34 is mounted in the annular groove to achieve the arrangement of the elastic member 34 in the sealing member 33.

With continued reference to fig. 3, the second seal 332 is located below the resilient member 34. The second seal 332 is configured to be capable of simultaneously abutting against the sealed shaft 1 and the sealed body 2 so that the second seal 33 achieves the second seal between the sealed shaft 1 and the sealed body 2 by the second seal 332. The second seal portion 332 has a cavity for accommodating the load transmission medium 4 therein. The load transmission medium 4 is an incompressible medium.

By providing the second seal portion 332 in the seal 33 and the second seal portion 332 having a cavity for accommodating the load transmission medium 4, since the load transmission medium 4 is an incompressible medium, the second seal portion 332 applies a load to the load transmission medium 4 when the sealed fluid acts on the second seal portion 332 in the Z direction (axial direction of the seal 33). Due to the incompressible properties and load transfer properties of the load transfer medium 4, the load transfer medium 4 transfers the applied load evenly along the cavity wall of the cavity to the second seal 332. That is, the load transmission medium 4 can convert the axial load applied by the sealed fluid received by the seal 33 into uniform load transmitted along all directions and apply the uniform load to the second seal portion 332, so as to enhance the sealing pressure of the sealing interface between the second seal portion 332 and the sealed shaft 1 and the sealed body 2, so that the elastic energy storage seal assembly 3 further has a second heavy pressure self-tightening characteristic at the second seal portion 332, and further improves the sealing performance of the elastic energy storage seal assembly 3.

The definition of the sealing interface between the second sealing portion 332 and the sealed shaft 1 and the sealed body 2 may be referred to the explanation of the first sealing portion 331 hereinabove, and will not be repeated here. The sealing pressure of the sealing interface between the second sealing portion 332 and the sealed shaft 1 and the sealed body 2 may also be referred to as the contact pressure of the second sealing portion 332 against the sealed shaft 1 and the sealed body 2.

The second seal 332 may be considered a root of the seal 33. Compared with the elastic energy storage sealing assembly 3a, the arrangement of the cavity in the second sealing part 332 and the load transmission medium 4 can enable the second sealing part 332 to also play a role in sealing, and the structure of the sealing element 33 can be fully utilized, so that the sealing capability of the sealing element 33 can be better exerted, the service performance of the sealing element 33 is greatly improved, the matching degree of the sealing capability of the elastic energy storage sealing assembly 3 and the pressure which can be borne is enhanced, and the sealing performance of the elastic energy storage sealing assembly 3 is improved.

Therefore, the arrangement of the second sealing part 332 and the cavity for accommodating the load transmission medium 4 can enhance the matching degree of the sealing capability of the elastic energy storage sealing assembly 3 and the pressure which can be borne, and the sealing performance of the elastic energy storage sealing assembly 3 is improved, and meanwhile, the elastic energy storage sealing assembly 3 also has the characteristic of double pressure self-tightening so as to further improve the sealing performance of the elastic energy storage sealing assembly 3.

It should be noted that, since the elastic energy storage sealing assembly 3 of the present application has the dual pressure self-tightening characteristic, the sealing performance of the sealing member 33 under high pressure can be greatly improved.

The deformation of the seal 33 at the first seal portion 331 and the second seal portion 332 may be elastic deformation. At this time, the sealing member 33 may be made of the same material as that of the flexible jacket mentioned above, and will not be described again.

Or the deformation of the seal 33 at the first seal portion 331 and the second seal portion 332 may be plastic deformation (unrecoverable deformation). At this time, the sealing member 33 may be made of an incompressible material.

Poisson's ratio refers to the ratio of the transverse positive strain to the axial positive strain of a material when it is in unidirectional tension or compression. Poisson's ratio, which may also be referred to as the transverse deformation coefficient, is the elastic constant that reflects the transverse deformation of a material. The poisson ratio of water is 0.5, with incompressible properties. The poisson's ratio of some rubbers is also close to 0.5 and can also be considered as incompressible materials.

The seal 33 may be made of an incompressible rubber or the like material with poisson's ratio also approaching 0.5. Or the seal 33 may be plastically deformed only at the first seal portion 331 or the second seal portion 332. For example, the seal 33 may be made of an incompressible rubber or the like having a poisson's ratio close to 0.5 at the portion where plastic deformation is generated, and the seal 33 may be made of the same material as the above-mentioned flexible jacket at the portion where elastic deformation is generated.

With continued reference to fig. 4, the second sealing portion 332 is configured to be capable of expanding and deforming in the radial direction of the seal 33 under the action of the load transmission medium 4 when in contact with the sealed fluid, and simultaneously abuts against the sealed shaft 1 and the sealed body 2 at the deformed portion, so as to seal the second sealing portion 332 between the sealed shaft 1 and the sealed 33, and form a second seal between the sealed shaft 1 and the sealed 33. When the second seal 332 is simultaneously abutted against the shaft 1 to be sealed and the seal 33 to be sealed, the second seal 332 may be abutted against the carrier 21.

Specifically, when the sealed fluid acts on the second seal portion 332 in the Z direction (axial direction of the seal 33), the second seal portion 332 can be compressed and deformed toward the inner side of the cavity in the axial direction of the seal 33 under the pressure of the sealed fluid. After the second seal portion 332 is subjected to compression deformation, the second seal portion 332 applies a load to the load transmission medium 4. Due to the incompressible properties and load transfer properties of the load transfer medium 4, to which the load is applied, will be pressurized and exert this pressure evenly on the second sealing portion 332 at the cavity wall of the cavity, so that an even transmission to the second sealing portion 332 is achieved. At this time, some of the load will be transmitted to the second seal portion 332 by the load transmission medium 4 in the axial direction of the seal 33, and other of the load will be transmitted to the second seal portion 332 by the load transmission medium 4 in the radial direction of the seal 33.

When a load is to be transmitted from the load transmission medium 4 to the second seal portion 332 in the radial direction of the seal 33, the second seal portion 332 is stretched by the load transmitted in the radial direction, so that the second seal portion 332 undergoes expansion deformation in the radial direction (X direction) of the seal 33, and the distance between the second seal portion 332 and the sealed shaft 1 and the seal 33 is pressed, so that the sealing pressure of the sealing interface between the second seal portion 332 and the sealed shaft 1 and the sealed body 2 is enhanced while the second seal portion 332 is simultaneously abutted against the sealed shaft 1 and the seal 33.

The higher the pressure of the fluid to be sealed, the stronger the sealing pressure of the sealing interface between the second sealing portion 332 and the shaft to be sealed 1 and the body to be sealed 2 is, which is a typical pressure self-tightening phenomenon.

When the second sealing portion 332 is not provided with a cavity, the seal 33 cannot have a heavy pressure self-tightening effect at the second sealing portion 332. This is because, although the seal 33 is compressively deformed in the axial direction (Z direction) of the seal 33 by the sealed fluid, the seal 33 is not distended and deformed in the radial direction (X direction) of the seal 33, and the axial pressure load cannot be converted into the radial contact pressure, and the pressure self-tightening effect is not achieved.

Referring again to fig. 3, the first sealing portion 331 includes two cantilever arms 312. The two cantilevers 312 are disposed at intervals along the radial direction of the sealing member 33, and the two cantilevers 312 abut against both sides of the elastic member 34 to realize simultaneous abutment of the first sealing portion 331 with the sealed shaft 1 and the sealed member 33 by the two cantilevers 312 to realize the first seal.

The cantilever 312 is circular. When the two cantilevers 312 are disposed at intervals in the radial direction of the seal 33, an annular structure may be formed so that the seal 33 is in an annular structure, and at any position in the circumferential direction of the seal 33, the first seal portion 331 can achieve sealing between the sealed shaft 1 and the sealed 33, and the sealing effect of the first seal is ensured.

The second sealing portion 332 is connected to the bottoms of the two cantilevers 312, and encloses a mounting groove 333 with the two cantilevers 312, so as to facilitate the arrangement of the elastic member 34 in the sealing member 33.

Referring again to fig. 3, in some embodiments, the first seal 331 may have a larger dimension in the radial direction (X-direction) of the seal 33 than the second seal 332, and the sizing of the seal 33 at the first seal 331 while the second seal is achieved by the second seal 332 can be facilitated to ensure that the seal 33 has an interference at the first seal 331 to achieve the sealing function of the first seal 331 when the spring energy storing seal assembly 3 is located between the sealed shaft 1 and the sealed body 2. By limiting the dimensions of the first seal 331 and the second seal 332, the seal 33 can be assembled and sealed at the first seal 331 and the second seal 332 without affecting each other when the elastic energy storage seal assembly 3 is applied to a machine.

The dimension of the second seal portion 332 in the radial direction of the seal 33 may be not larger than the dimension of the second seal portion 332 in the radial direction of the seal 33 while ensuring that the first seal portion 331 achieves the first seal, and in this case, the second seal portion 332 is abutted against the shaft 1 to be sealed and the body 2 to be sealed before the fluid to be sealed does not act on the second seal portion 332. When the sealing fluid acts on the second sealing portion 332, the second sealing portion 332 continues to deform in the radial direction of the seal 33 under the action of the load transmission medium 4, and the second pressure self-tightening characteristic can be achieved as well.

The structure of the elastic energy storage seal assembly 3 will be further described below with reference to the example in which the second seal 332 is configured to be abutted by the sealed shaft 1 and the sealed body 2 when in contact with the sealed fluid, as illustrated in fig. 3. Referring again to fig. 3, the second sealing portion 332 has an annular structure, so that the second sealing portion 332 can achieve sealing between the sealed shaft 1 and the sealed member 33 at any position in the circumferential direction of the sealing member 33 while the sealing member 33 has an annular structure, and a sealing effect of the second seal can be ensured.

In some embodiments, the load transfer medium 4 may be a liquid. Most of the usual liquids are incompressible media, so that the load transfer medium 4 is easy to obtain. For example, the load transmission medium 4 may be an incompressible liquid such as water. The load transmission medium 4 fills the cavity. The cavity is a sealed cavity within the second seal 332 so that the load transfer medium 4 is contained within the cavity.

In other embodiments, the load transfer medium 4 may also be a solid. For example, the load transfer medium 4 comprises an incompressible rubber or other incompressible material. In particular, the load transmission medium 4 may be rubber with a poisson's ratio close to 0.5. At least part of the load transmission medium 4 is disposed in the cavity, so that the second sealing portion 332 deforms along the radial direction of the sealing member 33, and meanwhile, the structure of the load transmission medium 4 can be more diversified, so as to adapt to different requirements of different mechanical devices on materials of the load transmission medium 4.

When the load transmission medium 4 may also be solid, the cavity is a sealed cavity within the second seal 332 (as shown in fig. 3). Alternatively, as shown in fig. 5, where the load transfer medium 4 may also be solid, the cavity may also be an open cavity within the second seal 332. In this way, when the load transmission medium 4 is in the cavity, so that the second sealing part 332 deforms along the radial direction of the sealing element 33, the structure of the load transmission medium 4 can be more diversified, so as to adapt to different requirements of different mechanical devices on the installation position of the load transmission medium 4.

With continued reference to fig. 5, because rubber is less tolerant to high temperature and long-term service, when the cavity is an open cavity, the open cavity may be located on a side of the second seal 332 away from the elastic member 34 to avoid contact of the load transfer medium 4 (e.g., rubber) with the sealed fluid, enhancing the tolerance of the load transfer medium 4 to high temperature and long-term service, and extending the service life of the elastic energy storage seal assembly 3.

For some fluids, for example, when the load transfer medium 4 is air, the spring loaded seal assembly 3 will have difficulty producing a dual pressure self-tightening effect when air is filled into the cavity as the load transfer medium 4, as the air is compressible.

The cavity is an annular cavity. Referring again to fig. 1, the cross-section of the annular cavity may comprise a rectangle. For example, the seal 33 may take the form of rounded corners or right angles at the corners of the annular cavity. The cross section of the annular cavity refers to a cross section at any one of the annular cavities in the circumferential direction of the seal 33.

Referring again to fig. 3 and 5, or in some embodiments, the cross-section of the annular cavity may also include a circle. When the cavity is a sealed cavity, the cross section of the annular cavity may be in the shape of a full circle (full circle). When the cavity is an open cavity, the cross section of the annular cavity may be in the shape of a non-full circle (non-full circle). For example, the cross-sectional shape of the seal 33 at the cavity may be semicircular or the like.

When the cross section of the annular cavity is rectangular, the sealing pressure of the sealing interface between the second sealing portion 332 and the sealed shaft 1 and the sealed body 2 is more uniform, and the stability of the sealing performance of the seal 33 at the second sealing portion 332 is also better, but there may be a concentration point of the internal stress of the seal 33, as compared with a circular shape. For this purpose, the seal 33 may take the form of a rounded corner at the corner of the annular cavity. When the sealing member 33 is rounded at the corners of the annular cavity, the risk of stress concentration of the sealing member 33 at the corners in the annular cavity can be reduced or even avoided, compared to a right angle design of the sealing member 33 at the corners of the annular cavity.

When the cross section of the annular cavity is circular, as compared to rectangular, the sealing pressure of the sealing interface between the second sealing portion 332 and the sealed shaft 1 and the sealed body 2 may be slightly deficient, but the characteristic of the internal stress of the seal 33 may be relatively superior, and the internal stress distribution of the seal 33 may be relatively uniform. Therefore, the shape of the cavity is not particularly limited in the present application to meet the design requirements of different elastic energy storage sealing assemblies 3.

The number of the cavities is more than one. For example, with continued reference to fig. 5, the number of cavities may be one. Or the number of cavities may be two, as shown in fig. 6. Or the number of the cavities can be three, etc. In the present application, the number of cavities is not particularly limited.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, display structure, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.

The term "and/or" as used herein is merely an association relationship describing the associated object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can lead the interior of two elements to be communicated or lead the two elements to be in interaction relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (10)

1. An elastic energy storage seal assembly, comprising:

An elastic member;

The sealing piece is of an annular structure, and is provided with a first sealing part and a second sealing part in the axial direction, wherein the first sealing part and the second sealing part are connected with each other, and a mounting groove is formed in the first sealing part; the first sealing part is configured to simultaneously abut against the sealed shaft and the sealed body; the elastic piece is positioned in the mounting groove and is abutted against the side wall of the first sealing part;

Wherein the second sealing part is positioned below the elastic piece; the second seal portion is configured to be capable of simultaneously abutting against the shaft to be sealed and the body to be sealed; the second sealing part is internally provided with a cavity for accommodating a load transmission medium, and the load transmission medium is incompressible medium.

2. The elastic energy storage seal assembly of claim 1 wherein said second seal portion is of annular configuration;

The second seal portion is configured to be capable of being expanded and deformed in a radial direction of the seal member by the load transmission medium when in contact with the fluid to be sealed, and to be simultaneously abutted against the shaft to be sealed and the body to be sealed.

3. The elastic energy storage seal assembly of claim 1 wherein said load transfer medium is a liquid and said load transfer medium fills said cavity;

the cavity is a sealed cavity in the second sealing portion.

4. The elastic energy storing seal assembly of claim 1 wherein the load transfer medium is a solid and at least a portion of the load transfer medium is disposed within the cavity.

5. The elastic energy storage seal assembly of claim 4 wherein said cavity is a sealed cavity or an open cavity within said second seal portion.

6. The elastic energy storage seal assembly of claim 5, wherein when the cavity is the open cavity, the open cavity is located on a side of the second seal portion remote from the elastic member.

7. The elastic energy storing seal assembly of claim 4 wherein said load transfer medium comprises an incompressible rubber member.

8. The elastic energy storage seal assembly of any one of claims 1-7 wherein the number of cavities is more than one; and/or the number of the groups of groups,

The cavity is an annular cavity, and the cross section of the annular cavity comprises a rectangle, a whole circle or a non-whole circle.

9. The elastic energy storage seal assembly of any one of claims 1-7, wherein said first seal portion includes two cantilevered arms spaced apart along a radial direction of said seal member and abutting two sides of said elastic member;

The second sealing part is connected to the bottoms of the two cantilevers and surrounds the mounting groove with the two cantilevers; the first seal portion has a larger dimension in the radial direction of the seal than the second seal portion.

10. A mechanical device comprising a sealed body, a sealed shaft and an elastic energy storage seal assembly according to any one of claims 1 to 9;

The sealed shaft penetrates through the sealed body, the elastic energy storage sealing assembly is arranged between the sealed shaft and the sealed body, and the sealing piece is simultaneously abutted to the sealed shaft and the sealed body.