Dynamic sealing structure with high sealing performance

Abstract

The utility model discloses a dynamic seal structure with high leakproofness, which relates to the technical field of dynamic seal structures and comprises a seal cavity and rotary seals, two groups of rotary seals are mounted in the seal cavity, a rotary shaft tube horizontally penetrates through the middle of each rotary seal, a seal cover is mounted at one end of the seal cavity, and a seal cover is mounted at the other end of the seal cavity. A fixing bolt horizontally penetrates through the edge of the sealing cover, and a labyrinth seal is installed in the sealing cover. According to the dynamic sealing structure with the high sealing performance, two sets of rotary seals are not installed in the sealing cavity, and meanwhile, the fixed sealing block is installed at the joint of the sealing cover and the sealing cavity, so that the sealing performance of the whole structure is guaranteed to the maximum extent while the mobility of the structure is not affected, and unnecessary structure leakage is avoided; in addition, a flange structure between the sealing cover and the sealing cavity is utilized, so that the interior of the sealing cavity has good structural maintenance convenience and enough structural sealing performance, and the overall stability and flexibility of the structure are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of dynamic sealing structures, in particular to a dynamic sealing structure with high sealing performance. Background Technique

[0002] Dynamic sealing refers to the sealing between two relatively moving objects, usually composed of a rotating ring and a stationary ring. The rotating ring and the stationary ring are kept in contact and slide relative to each other under the action of fluid pressure and the elastic force of the compensation mechanism, so as to prevent fluid leakage. The key to dynamic sealing lies in the end face sealing of the rotating ring and the stationary ring, which is also the key to determining the performance and service life of mechanical seals. Common forms of dynamic sealing include packing seal, mechanical seal, dry gas seal, etc.

[0003] For example, the utility model with the application number 201520329691.X discloses a dynamic sealing structure. In this dynamic sealing structure, a connecting part for keeping the sealing ring body relatively stationary with the rotating part is provided on the sealing ring body, and a receiving groove corresponding to and adapted to the position of the connecting part is opened on the rotating part. Thus, wear is reduced, service life is improved, and sealing effect is ensured. However, for the dynamic sealing structure similar to that in the above document, due to the relatively simple and single sealing structure, the sealing effect is relatively limited. Once the sealing ring body is damaged, it is impossible to stop the flow immediately.

[0004] Therefore, in view of this, research and improvement are carried out on the existing structure and its deficiencies, and a dynamic sealing structure with high sealing performance is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a dynamic sealing structure with high sealing performance to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A dynamic sealing structure with high sealing performance, including a sealing cavity and a rotary seal. Two groups of rotary seals are installed inside the sealing cavity, and a rotary shaft tube horizontally penetrates through the middle of the rotary seal. A cover is installed at one end of the sealing cavity, and fixing bolts horizontally penetrate through the edge of the cover. A labyrinth seal is installed inside the cover, and a sealing ring is installed at the connection between the cover and the labyrinth seal. At the same time, an external shaft tube is horizontally penetrated and installed in the middle of the sealing ring, and a fixed sealing block is installed at one end of the external shaft tube close to the rotary shaft tube.

[0007] Further, a groove structure matching the outer surface structure of the rotary seal is opened inside the sealing cavity for stabilizing the rotary seal, and the rotary seals are horizontally arranged at one end of the rotary shaft tube close to the external shaft tube.

[0008] Further, a hole structure for connecting an external pipeline is formed on the surface of the sealed cavity, and a hole structure for communicating the interior of the sealed cavity with the interior of the rotary seal is formed on the surface of the rotary shaft tube away from the rotary seal.

[0009] Further, a flange structure is adopted for connecting between the cover and the sealed cavity, and the fixing bolts are arranged in a circular array with the cover as the center.

[0010] Further, the cover and the sealed cavity are both threadedly connected with the fixing bolts, and the connection between the sealed cavity and the cover is arranged in an embedded structure.

[0011] Further, the rotary shaft tube and the external shaft tube are threadedly connected, and the fixed sealing block and the external shaft tube are threadedly connected.

[0012] Further, the fixed sealing block is fitted and installed between the cover and the sealed cavity, and a slot structure matching the structure of one end of the rotary shaft tube is formed at one end of the fixed sealing block close to the rotary shaft tube.

[0013] Further, groove structures matching the surface structure of the sealing ring are formed on the inner wall surface of the cover and the outer surface of the labyrinth seal, and the sealing ring is installed between the labyrinth seal and the cover with an interference fit.

[0014] The utility model provides a dynamic sealing structure with high sealing performance, and has the following beneficial effects:

[0015] 1. In the utility model, two groups of rotary seals are horizontally arranged inside the sealed cavity. At the same time, the holes formed on the surfaces of the sealed cavity and the rotary shaft tube are arranged at one end away from the rotary seal and the cover, so that the interior of the sealed cavity is divided into three intervals. By using the above structure, it can effectively avoid that when one of the rotary seals is structurally damaged, the other rotary seal can be used for temporary structural sealing, providing effective reaction time for operators, avoiding a large amount of leakage caused by structural damage, and playing a good role in automatic protection. In addition, by installing a fixed sealing block inside the connection between the sealed cavity and the cover, the structural sealing performance inside the structure can be further guaranteed, so as to prevent the leakage problem generated when both groups of rotary seals are structurally damaged, providing corresponding time for operators and reducing the leakage risk.

[0016] 2. In this utility model, a flange structure is utilized between the sealed cavity and the cover, in conjunction with the use of fixing bolts, enabling sufficient connection stability and firmness between the two. On the one hand, the fixed sealing block can be fixed between the sealed cavity and the cover, and at the same time, it also provides a certain degree of operational convenience for maintenance operations, thus facilitating the maintenance operations of the operators on the internal structure. On the other hand, it also ensures sufficient structural sealing while having the structural disassembly property between the structures, minimizing the problem of structural leakage as much as possible. By installing a sealing ring at the connection between the cover and the labyrinth seal, on the one hand, it facilitates the rotation of the external shaft tube driving the rotating shaft tube under the structure of the labyrinth seal, and on the other hand, it also ensures the structural stability and sealing property of the labyrinth seal inside the cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a perspective view of the main body of a highly sealed dynamic sealing structure of this utility model;

[0018] Figure 2 is an exploded view of the main body of a highly sealed dynamic sealing structure of this utility model;

[0019] Figure 3 is a three-dimensional structure view of the cover, labyrinth seal and sealing ring of a highly sealed dynamic sealing structure of this utility model;

[0020] Figure 4 is a three-dimensional structure view of the fixed sealing block of a highly sealed dynamic sealing structure of this utility model.

[0021] In the figure: 1, sealed cavity; 2, rotary seal; 3, rotating shaft tube; 4, cover; 5, fixing bolt; 6, labyrinth seal; 7, sealing ring; 8, external shaft tube; 9, fixed sealing block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further describes in detail the embodiments of this utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate this utility model, but cannot be used to limit the scope of this utility model.

[0023] As Figures 1 to 4As shown in the figure, a high-sealing dynamic seal structure includes a sealing cavity 1 and a rotary seal 2. Two groups of rotary seals 2 are installed inside the sealing cavity 1, and a rotary shaft tube 3 horizontally penetrates through the middle of the rotary seal 2. A cover 4 is installed at one end of the sealing cavity 1, and fixing bolts 5 horizontally penetrate through the edge of the cover 4. A labyrinth seal 6 is installed inside the cover 4, and a sealing ring 7 is installed at the junction of the cover 4 and the labyrinth seal 6. At the same time, an external shaft tube 8 horizontally penetrates through the middle of the sealing ring 7. A fixed seal block 9 is installed at one end of the external shaft tube 8 close to the rotary shaft tube 3. A groove structure matching the outer surface structure of the rotary seal 2 is opened inside the sealing cavity 1 to stabilize the rotary seal 2, and the rotary seals 2 are horizontally arranged at one end of the rotary shaft tube 3 close to the external shaft tube 8. A hole structure for connecting an external pipeline is opened on the surface of the sealing cavity 1. A hole structure for communicating the inside of the sealing cavity 1 with the inside of the rotary seal 2 is opened on the surface of the end of the rotary shaft tube 3 far from the rotary seal 2. By horizontally arranging two groups of rotary seals 2 inside the sealing cavity 1, and at the same time setting the holes opened on the surfaces of the sealing cavity 1 and the rotary shaft tube 3 at one end far from the rotary seal 2 and the cover 4, the inside of the sealing cavity 1 is divided into three intervals. By using the above structure, it can effectively avoid that when one of the rotary seals 2 is structurally damaged, the other rotary seal 2 can be used for temporary structural sealing.

[0024] As Figures 1 to 4 shown, a flange structure is used to connect the cover 4 and the sealing cavity 1 to each other, and the fixing bolts 5 are arranged in an annular array with the cover 4 as the center. The cover 4 and the sealing cavity 1 are both threadedly connected to the fixing bolts 5, and the junction of the sealing cavity 1 and the cover 4 is arranged in an embedded structure. The rotary shaft tube 3 and the external shaft tube 8 are threadedly connected to each other, and the fixed seal block 9 and the external shaft tube 8 are threadedly connected to each other. The fixed seal block 9 is fitted and installed between the cover 4 and the sealing cavity 1, and a slot structure matching the structure of one end of the rotary shaft tube 3 is opened at one end of the fixed seal block 9 close to the rotary shaft tube 3. Groove structures matching the surface structure of the sealing ring 7 are opened on the inner wall surface of the cover 4 and the outer surface of the labyrinth seal 6, and the sealing ring 7 is installed in an interference fit between the labyrinth seal 6 and the cover 4. By using the flange structure and cooperating with the use of the fixing bolts 5 between the sealing cavity 1 and the cover 4, the two have sufficient connection stability and firmness. On the one hand, the fixed seal block 9 can be fixed between the sealing cavity 1 and the cover 4, and at the same time, it also provides a certain degree of operation convenience for maintenance operations, so as to facilitate the maintenance operation of the operators on the inside of the structure. On the other hand, it also ensures that while the structure has structural disassembly and assembly properties, it also guarantees sufficient structural sealing.

[0025] In summary, as Figures 1 to 4As shown, for this highly sealed dynamic seal structure, during use, first, when in use, the holes opened on the surface of the sealing cavity 1 can be used to cooperate with pipelines to be connected to upstream or downstream equipment. Then, the external shaft tube 8 can be connected to the upstream or downstream equipment through a pipeline joint, thereby forming a complete pipeline;

[0026] Since the rotating shaft tube 3 and the external shaft tube 8 are connected to each other through a threaded structure, and a fixed seal block 9 is provided at the connection, while ensuring the firmness of the structure, it cooperates with the rotating seal 2 to ensure sufficient structural sealing inside the sealing cavity 1;

[0027] At the same time, by using the cover 4 installed at the opening of the sealing cavity 1 with the fixing bolts 5, in cooperation with the use of the sealing ring 7 and the labyrinth seal 6, it can provide flexibility for the axial rotation of the external shaft tube 8 and the rotating shaft tube 3, while also ensuring the structural sealing, and avoiding leakage problems caused by damage to the rotating seal 2 during the reciprocating rotation process.

[0028] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

Claims

1. A high-sealing dynamic sealing structure, comprising a sealing cavity (1) and a rotary seal (2), characterized in that: Inside the sealed cavity (1), two sets of rotary seals (2) are installed, and a rotary shaft tube (3) horizontally penetrates through the middle of the rotary seal (2). One end of the sealed cavity (1) is provided with a cover (4), and fixing bolts (5) horizontally penetrate through the edge of the cover (4). Moreover, a labyrinth seal (6) is installed inside the cover (4), and a sealing ring (7) is installed at the connection between the cover (4) and the labyrinth seal (6). At the same time, an external shaft tube (8) is horizontally penetrated through the middle of the sealing ring (7). One end of the external shaft tube (8) close to the rotary shaft tube (3) is provided with a fixed sealing block (9).

2. The high-sealing dynamic sealing structure according to claim 1, wherein, Inside the sealed cavity (1), a groove structure that matches the outer surface structure of the rotary seal (2) is provided to stabilize the rotary seal (2), and the rotary seals (2) are horizontally arranged at one end of the rotary shaft tube (3) close to the external shaft tube (8).

3. A highly-sealed dynamic sealing structure according to claim 1, characterized in that, On the surface of the sealed cavity (1), a hole structure for connecting an external pipeline is provided. On the surface of one end of the rotary shaft tube (3) away from the rotary seal (2), a hole structure for communicating the inside of the sealed cavity (1) with the inside of the rotary seal (2) is provided.

4. A highly-sealed dynamic sealing structure according to claim 1, characterized in that, Between the cover (4) and the sealed cavity (1), a flange structure is used for mutual connection, and the fixing bolts (5) are arranged in a circular array with the cover (4) as the center.

5. A highly-sealed dynamic seal structure according to claim 1, characterized in that, Both the cover (4) and the sealed cavity (1) are in threaded connection with the fixing bolts (5), and the connection between the sealed cavity (1) and the cover (4) is arranged in an embedded structure.

6. The high-sealing dynamic sealing structure according to claim 1, characterized in that, The rotary shaft tube (3) and the external shaft tube (8) are in threaded connection, and the fixed sealing block (9) and the external shaft tube (8) are in threaded connection.

7. A highly-sealed dynamic sealing structure according to claim 1, characterized in that, The fixed sealing block (9) is fitted and installed between the cover (4) and the sealed cavity (1), and a slot structure that matches the structure of one end of the rotary shaft tube (3) is provided at one end of the fixed sealing block (9) close to the rotary shaft tube (3).

8. A highly-sealed dynamic sealing structure according to claim 1, characterized in that, On the inner wall surface of the cover (4) and the outer surface of the labyrinth seal (6), groove structures that match the surface structure of the sealing ring (7) are provided, and the sealing ring (7) is installed in an interference fit between the labyrinth seal (6) and the cover (4).

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