Mechanical seal with simple structure

Abstract

The utility model relates to a mechanical seal with a simple structure, which comprises a rotating shaft and a sealing box body sleeved outside the rotating shaft, the left end of the sealing box body is fixedly connected with a sealing flange, the rotating shaft is fixedly connected with a spring seat positioned in the sealing box body, the left side and the right side of the spring seat are respectively provided with a moving ring, and the moving ring is fixedly connected with the sealing flange. The spring seat is provided with a limiting piece used for preventing the movable ring from rotating relative to the spring seat, the inner side of the movable ring is provided with a first sealing ring abutting against the rotating shaft, the right end of the sealing box body and the inner side of the sealing flange are both fixedly provided with static rings, and the movable ring abuts against the static rings. An elastic mechanism used for pushing the movable ring to be tightly attached to the static ring is arranged between the movable ring and the spring seat. The sealing device is simple in structure and stable and reliable in sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical seals, in particular to a mechanical seal with a simple structure. Background Art

[0002] Mechanical seal is a high-precision, high-performance shaft sealing device, which is mainly used to solve the sealing problem between the rotating shaft and the housing to prevent the leakage of the transported or processed liquid, gas or slurry material from the shaft seal, and also to prevent external impurities from entering the machine.

[0003] Although some existing mechanical seal structures can effectively prevent leakage of fluid media to a certain extent, there are some urgent problems to be solved in practical applications. For example, mechanical seal structures often contain multiple precision parts, such as complex spring systems, multi-layer auxiliary seals, and precisely machined dynamic and static ring components, which not only increase the difficulty and cost of manufacturing, but also may lead to cumbersome installation and debugging processes, inconvenience in maintenance and replacement. In addition, complex structures may cause the sealing performance to decline during long-term operation due to factors such as uneven wear of various components and thermal expansion, affecting the overall work efficiency and operation stability of the equipment. Therefore, in response to the above problems, this application proposes a mechanical seal with simple structure and stable and reliable sealing performance. Utility Model Content

[0004] The utility model provides a mechanical seal with a simple structure and stable and reliable sealing performance, which solves the above problems existing in the use process of the prior art.

[0005] The technical solution of the utility model is achieved as follows: a mechanical seal with a simple structure comprises a rotating shaft and a sealing box body sleeved outside the rotating shaft, a sealing flange is fixedly connected to the left end of the sealing box body, a spring seat located in the sealing box body is fixedly connected to the rotating shaft, moving rings are arranged on the left and right sides of the spring seat, a limiter is arranged on the spring seat for preventing the moving ring from rotating relative to the spring seat, a first sealing ring abutting against the rotating shaft is arranged on the inner side of the moving ring, a static ring is fixedly arranged on the right end of the sealing box body and the inner side of the sealing flange, the moving ring abuts against the static ring, and an elastic mechanism for pushing the moving ring to fit tightly against the static ring is arranged between the moving ring and the spring seat.

[0006] Preferably, the sealed box body has a cooling cavity, the spring seat and the dynamic ring are both located in the cooling cavity, and a coolant inlet and a coolant outlet leading to the cooling cavity are provided on the side wall of the sealed box body.

[0007] Preferably, the elastic mechanism includes a spring, and at least three installation openings are circumferentially opened on the spring seat. The number of the springs is the same as the installation openings and they are correspondingly located in each of the installation openings, and the two ends of the spring respectively abut against the movable rings on the left and right sides of the spring seat.

[0008] Preferably, a plurality of limiting grooves are circumferentially formed on the movable ring, and the limiting member includes a limiting rod integrally formed on the spring seat, the number and position of the limiting rods correspond to the limiting grooves, and a limiting block located in the limiting groove is integrally formed on the limiting rod.

[0009] Preferably, an elastic pad is provided between the spring seat and the dynamic ring, and the elastic pad has a notch for each of the springs to pass through.

[0010] Preferably, a plurality of fixing openings are radially opened on the spring seat, and screws are threadedly connected to the fixing openings, and the screws are fixed on the rotating shaft.

[0011] Preferably, a second sealing ring abutting against the static ring is provided on the right end of the sealing box and the sealing flange.

[0012] In summary, the beneficial effects of the present invention are:

[0013] 1. The utility model forms a compact and logically clear structural system by rationally arranging various key components, such as the rotating shaft, sealing housing, sealing flange, spring seat, dynamic ring, limiter, first sealing ring, static ring and elastic mechanism. Compared with the traditional mechanical sealing device with complex structure, the number of parts and assembly levels are reduced, the complexity of production and assembly is reduced, and the simplicity and ease of use of the overall structure are improved. In addition, due to the simplified structural design, the mechanical seal is more convenient in the actual installation and disassembly process. The dynamic ring design on the spring seat and the limiter cooperate to ensure the reliable positioning of the dynamic ring in the axial direction, and it will not deviate with the rotation of the rotating shaft, thereby enhancing the sealing effect. The dynamic ring and the static ring are always kept in close contact through the elastic mechanism drive, which effectively prevents the leakage of internal and external fluids and improves the reliability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the assembled three-dimensional structure of the spring seat, the dynamic ring, the spring and the elastic pad in the utility model;

[0017] Figure 3 for Figure 2 Schematic diagram of the three-dimensional structure after removing the dynamic ring and elastic pad on one side of the spring seat;

[0018] Figure 4 for Figure 2 Schematic diagram of the structural explosion.

[0019] In the figure: 1. rotating shaft; 21. sealing box; 211. cooling chamber; 212. coolant inlet; 213. coolant outlet; 22. sealing flange; 3. spring seat; 31. mounting port; 32. limiting rod; 33. limiting block; 34. fixing port; 4. moving ring; 41. limiting groove; 51. first sealing ring; 52. second sealing ring; 6. static ring; 7. spring; 8. elastic pad; 81. notch; 9. screw. DETAILED DESCRIPTION

[0020] The following will be combined with the attached embodiment of the present utility model Figure 1-4 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Example:

[0022] like Figures 1 to 4 As shown, the utility model discloses a mechanical seal with a simple structure, which includes a rotating shaft 1 and a sealing box body 21 sleeved outside the rotating shaft 1, a sealing flange 22 is fixedly connected to the left end of the sealing box body 21, and the sealing flange 22 and the sealing box body 21 are fixed by bolts, and a spring seat 3 located in the sealing box body 21 is fixedly connected to the rotating shaft 1, and a dynamic ring 4 is provided on both the left and right sides of the spring seat 3, and a limiter is provided on the spring seat 3 for preventing the dynamic ring 4 from rotating relative to the spring seat 3, so that when the rotating shaft 1 rotates, the dynamic ring 4 can be driven to rotate together through the spring seat 3, and then, the dynamic ring 4 A first sealing ring 51 is provided on the inner side thereof, which abuts against the rotating shaft 1. The first sealing ring 51 is used to ensure the sealing performance between the dynamic ring 4 and the rotating shaft 1. In addition, a static ring 6 rotatably fitted on the outside of the rotating shaft 1 is fixedly provided at the right end of the sealing box body 21 and the inner side of the sealing flange 22. The dynamic ring 4 abuts against the static ring 6, and an elastic mechanism for pushing the dynamic ring 4 to fit tightly against the static ring 6 is provided between the dynamic ring 4 and the spring seat 3. As the dynamic ring 4 rotates along with the static ring 6, it is inevitable that there will be wear. The elastic mechanism can keep the dynamic ring 4 in contact with the static ring 6 and maintain a reliable seal.

[0023] In the utility model, a cooling cavity 211 is provided in the sealed box body 21, and the spring seat 3 and the dynamic ring 4 are both located in the cooling cavity 211. A coolant inlet 212 and a coolant outlet 213 leading to the cooling cavity 211 are provided on the side wall of the sealed box body 21. Coolant can be injected into the cooling cavity 211 through the coolant inlet 212 and leave from the coolant outlet 213, and the cycle continues in this way, so that when the shaft 1 rotates, the dynamic ring 4 and the stationary ring 6 are cooled, thereby ensuring the service life of the utility model.

[0024] Specifically, the elastic mechanism includes a spring 7. Four mounting openings 31 are circumferentially opened on the spring seat 3. The number of springs 7 is the same as the mounting openings 31 and they are correspondingly located in each mounting opening 31. The two ends of the spring 7 respectively abut against the dynamic rings 4 on the left and right sides of the spring seat 3. The two ends of the spring 7 can simultaneously push the dynamic rings 4 on the left and right sides of the spring seat 3, so that the dynamic ring 4 is kept tightly against the static ring 6, and the spring 7 is placed in the mounting opening 31 very stably without positional displacement.

[0025] Furthermore, eight limit grooves 41 are circumferentially provided on the movable ring 4, and the limit member includes a limit rod 32 integrally formed on the spring seat 3, the number and position of the limit rod 32 correspond to the limit groove 41, and a limit block 33 located in the limit groove 41 is integrally formed on the limit rod 32, and the limit block 33 is used to enable the movable ring 4 to rotate along with the spring seat 3 along with the rotating shaft 1, but the movable ring 4 can slide axially relative to the limit block 33 through the limit groove 41, so as not to interfere with the spring 7 pushing the movable ring 4 to fit onto the static ring 6.

[0026] In the utility model, an elastic pad 8 is further provided between the spring seat 3 and the dynamic ring 4, and the elastic pad 8 has a notch 81 for each spring 7 to pass through. The elastic pad 8 has a certain sealing effect. When the first sealing ring 51 leaks, the elastic pad 8 can play a second sealing role.

[0027] The specific structure of the spring seat 3 fixed on the rotating shaft 1 is that a plurality of fixing openings 34 are radially opened on the spring seat 3, screws 9 are threadedly connected to the fixing openings 34, and the screws 9 are fixed on the rotating shaft 1, so that the spring seat 3 is fixed on the rotating shaft 1.

[0028] In addition, a second sealing ring 52 is disposed on the right end of the sealing box 21 and the sealing flange 22 to abut against the stationary ring 6 , and the sealing ring ensures the sealing performance between the sealing box 21 and the sealing flange 22 and the stationary ring 6 .

[0029] It should also be pointed out that the terms used in the present invention, such as "front", "rear", "vertical", "horizontal", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mechanical seal with a simple structure, comprising a rotating shaft and a sealing box sleeved outside the rotating shaft, characterized in that: A sealing flange is fixedly connected to the left end of the sealing box body, a spring seat located in the sealing box body is fixedly connected to the rotating shaft, moving rings are provided on the left and right sides of the spring seat, a limiter is provided on the spring seat for preventing the moving ring from rotating relative to the spring seat, a first sealing ring abutting against the rotating shaft is provided on the inner side of the moving ring, a static ring is fixedly provided on the right end of the sealing box body and the inner side of the sealing flange, the moving ring abuts against the static ring, and an elastic mechanism for pushing the moving ring to fit tightly against the static ring is provided between the moving ring and the spring seat.

2. A mechanical seal with a simple structure according to claim 1, characterized in that: The sealed box body is provided with a cooling cavity, the spring seat and the dynamic ring are both located in the cooling cavity, and a cooling liquid inlet and a cooling liquid outlet leading to the cooling cavity are provided on the side wall of the sealed box body.

3. A mechanical seal with a simple structure according to claim 1, characterized in that: The elastic mechanism includes a spring, and at least three installation openings are circumferentially opened on the spring seat. The number of the springs is the same as the installation openings and they are correspondingly located in each of the installation openings. The two ends of the spring respectively abut against the dynamic rings on the left and right sides of the spring seat.

4. A mechanical seal with a simple structure according to claim 1, characterized in that: The movable ring is provided with a plurality of limit grooves in a circumferential direction, and the limit member includes a limit rod integrally formed on the spring seat, the number and position of the limit rod correspond to the limit groove, and the limit rod is integrally formed with a limit block located in the limit groove.

5. A mechanical seal with a simple structure according to claim 3, characterized in that: An elastic pad is arranged between the spring seat and the moving ring, and the elastic pad has a notch for each of the springs to pass through.

6. A mechanical seal with a simple structure according to claim 1, characterized in that: The spring seat is radially provided with a plurality of fixing openings, the fixing openings are threadedly connected with screws, and the screws are fixed on the rotating shaft.

7. A mechanical seal with a simple structure according to claim 1, characterized in that: The right end of the sealing box and the sealing flange are both provided with a second sealing ring which abuts against the static ring.

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