Anti-vibration mechanical seal

Abstract

The utility model relates to mechanical seal technical field discloses an anti-vibration mechanical seal, including the casing, the inside fixed connection of casing has the protection shell, the inside fixed connection of protection shell has two spring no.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to an anti-vibration mechanical seal. Background Technology

[0002] Vibration-resistant mechanical seals are sealing devices specifically designed for high-vibration operating conditions. They enhance vibration resistance and ensure sealing reliability by optimizing structural elastic elements or floating rings and selecting highly wear-resistant materials. They employ elastic support or damping structures to reduce the impact of vibration, and the floating ring design can adapt to axial and radial displacement. Combined with hard end face materials, they improve wear resistance and are suitable for equipment that is prone to vibration, such as pumps and compressors. They can effectively prevent leakage and extend service life and are widely used in petrochemical, power, metallurgical and other industrial fields.

[0003] The vibration-resistant mechanical seal adopts a multi-stage buffer structure design. The main sealing ring is made of hard alloy or silicon carbide to ensure wear resistance. The secondary seal uses flexible graphite or O-ring to provide axial compensation. The built-in wave spring or metal bellows is used as an elastic element to automatically compensate for axial displacement. The floating stationary ring design can absorb radial vibration. This multi-layer buffer structure can effectively isolate equipment vibration, maintain stable contact of the sealing surface, and significantly improve the sealing reliability under vibration conditions.

[0004] Vibration-resistant mechanical seals have certain limitations in fixing the original components. Although their floating ring structure and elastic elements can absorb vibration, they also lead to insufficient fixing stiffness. Under extreme vibration conditions, they are prone to fretting wear. The multi-stage buffer design increases the axial dimension and requires more installation space. The dynamic compensation mechanism has strict requirements on the machining accuracy of the parts and the assembly process. If the fixing is not done properly, uneven wear is likely to occur. They cannot be freely adjusted according to the shaft. Therefore, a vibration-resistant mechanical seal is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a vibration-resistant mechanical seal, which aims to improve the problem of fixed sealing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An anti-vibration mechanical seal includes a housing, a protective shell fixedly connected to the inner side of the housing, two springs II fixedly connected to the inner side of the protective shell, a support plate fixedly connected to the other end of each of the two springs II, a limiting block fixedly connected to the bottom end of the support plate, a spring I fixedly connected to the rear end of the limiting block, a locking block fixedly connected to the rear end of the spring I, a fixing block fixedly connected to the rear end of the locking block, and a shock-absorbing component fixedly connected to the bottom end of the housing.

[0008] As a further description of the above technical solution:

[0009] The shock-absorbing assembly includes multiple soft shells, the front ends of which are fixedly connected to the rear end of the shell, and three damping rings 1 are slidably connected inside the multiple soft shells. The bottom ends of the three damping rings 1 are fixedly connected to damping rings 2, and a support rod is slidably connected inside the damping rings 2.

[0010] As a further description of the above technical solution:

[0011] The inner side of the card block is rotatably connected to two slide rods, and the right end of each slide rod is fixedly connected to a connecting plate. The right end of the connecting plate is fixedly connected to a slide rod.

[0012] As a further description of the above technical solution:

[0013] The outer side of the first slide rod is rotatably connected to the inner side of the limiting base block, and the outer side of the limiting base block is slidably connected to the outer side of the second slide rod.

[0014] As a further description of the above technical solution:

[0015] A sliding rod is fixedly connected to the top of the support plate, and the outer side of the sliding rod is slidably connected to the inside of the protective shell;

[0016] As a further description of the above technical solution:

[0017] A sealing ring is fixedly connected to the front end of the housing, a sealing strip is fixedly connected to the front end of the sealing ring, and a moving ring is slidably connected to the outer side of the sealing strip;

[0018] As a further description of the above technical solution:

[0019] The rear end of the soft shell is fixedly connected to a bottom ring, and four positioning rods are slidably connected inside the bottom ring;

[0020] As a further description of the above technical solution:

[0021] The outer side of the limiting bottom block is slidably connected to the inside of the protective shell, and the inside of the protective shell is slidably connected to the outer side of the fixing block.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the fixing block drives the locking block, the locking block drives the first spring, the first spring drives the limiting bottom block, the locking block drives the first slide rod, the first slide rod drives the connecting plate, the connecting plate drives the second slide rod, the second slide rod drives the support plate, the support plate drives the sliding rod, and the support plate drives the second spring, so that the shaft to be sealed is freely fixed by the fixing component after entering the housing, and fixed according to the appropriate force.

[0024] 2. In this utility model, the outer shell drives the soft shell, the soft shell drives the support rod, the support rod drives the first shock absorber ring, and the first shock absorber ring drives the second shock absorber ring. The multi-layered damping reduces the impact of vibration on mechanical parts and further improves the vibration resistance. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of an anti-vibration mechanical seal proposed in this utility model;

[0026] Figure 2 This is a schematic diagram of the housing structure of an anti-vibration mechanical seal proposed in this utility model;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0029] Legend:

[0030] 1. Housing; 2. Sealing ring; 3. Sealing strip; 4. Moving ring; 5. Soft shell; 6. Bottom ring; 7. Positioning rod; 8. Limiting bottom block; 9. Spring 1; 10. Locking block; 11. Fixing block; 12. Support plate; 13. Sliding rod; 14. Spring 2; 15. Protective shell; 16. Sliding rod 1; 17. Sliding rod 2; 18. Connecting plate; 19. Support rod; 20. Shock-absorbing ring 1; 21. Shock-absorbing ring 2. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1 to 3This utility model provides an embodiment of a vibration-resistant mechanical seal, comprising a housing 1, which serves as the external frame of the entire seal. Its internal space provides space for shaft installation and the operation of various components. A protective shell 15 is fixedly connected to the inner side of the housing 1. The protective shell 15 has a cylindrical structure and surrounds the core component, providing protection and support for the internal parts. A sealing ring 2 is fixedly connected to the front end of the housing 1, tightly fitting against the front end. A sealing strip 3, fixedly connected to its front end, is an annular protrusion that slides with an outer moving ring 4, forming... The sealing contact surface effectively prevents media leakage. Two springs 14 are symmetrically distributed on the inner side of the protective shell 15. One end of the spring 14 is fixed to the inner wall of the protective shell 15, and the other end is connected to the support plate 12. The support plate 12 is flat, and the bottom end of the limiting block 8 is fixedly connected to it. The outer side of the limiting block 8 matches the rectangular sliding groove opened inside the protective shell 15, and can slide back and forth in the sliding groove. The top end of the support plate 12 is fixedly connected to the sliding rod 13. The sliding rod 13 slides and engages with the through hole opened at the top of the protective shell 15, and can move up and down in the hole.

[0033] The rear end of the limiting base block 8 is connected to spring 9, and the other end of spring 9 is fixed to the locking block 10. The rear end of the locking block 10 is connected to the fixing block 11. The fixing block 11 can also slide on the sliding groove inside the protective shell 15. The inner side of the locking block 10 is rotatably connected to two sliding rods 16 via a rotating shaft. The right ends of the two sliding rods 16 are connected to the connecting plate 18 via a rotating shaft. The right end of the connecting plate 18 is fixedly connected to the sliding rod 17. The sliding rod 16 rotates and engages with the rotating groove provided on the inner side of the limiting base block 8. The outer side of the limiting base block 8 can slide left and right on the sliding rod 17. In this way, multiple components are connected by rotation and sliding to form a set of ingenious interconnected structures. The bottom end of the shell 1 is fixedly connected to a shock-absorbing component, which is specifically used to cope with external vibrations and ensure the stable operation of the seal.

[0034] Reference Figure 1 , Figure 2 and Figure 4 The damping assembly includes multiple soft shells 5, each soft shell 5 being a hollow bladder-shaped structure. The front end of each soft shell 5 is fixed to the rear end of the shell 1, isolating the internal damping structure from the outside. Each soft shell 5 has three damping rings 20 slidably connected inside. The damping ring 20 is a ring-shaped structure, and its bottom end is fixedly connected to a damping ring 21. The damping ring 21 is also ring-shaped, but its inner diameter is slightly larger than that of the damping ring 20. A support rod 19 is slidably connected inside the damping ring 21. The support rod 19 is vertically set and serves to support and assist in damping. A bottom ring 6 is fixedly connected to the rear end of the soft shell 5. The bottom ring 6 is an annular plate-shaped structure, and four positioning rods 7 are slidably connected inside it. The positioning rods 7 are used to limit the movement range of the soft shell 5, ensuring that the damping assembly works in an orderly manner.

[0035] Working principle: During use, when the shaft to be sealed is inserted into the housing 1, the shaft first contacts the outer side of the fixing block 11. At this time, the operator needs to pull the limiting bottom block 8 to retract the entire fixing assembly to the outside of the housing 1. During the pulling of the limiting bottom block 8, the locking block 10 is driven to retract through the connection of spring 9. When the locking block 10 moves backward, the inner sliding rod 16 is subjected to tension and shifts about the rotation connection point with the locking block 10. The sliding rod 16 drives the sliding rod 17 through the connecting plate 18, causing the connecting plate 18 on the other side to shift from the sliding rod 16. Finally, the limiting bottom block 8 is pressed. At the same time, the limiting bottom block 8 drives the support plate 12 to move backward, and the support plate 12 pushes the limiting bottom block 8. The sliding rod 13 at the end slides upward in the through hole inside the protective shell 15, thereby compressing the second spring 14 until the shaft is fully inserted. Finally, the second spring 14 and the first spring 9 release pressure, causing the entire assembly to spring back and compress and fix the inserted shaft. The elastic force generated after the first spring 9 and the second spring 14 are compressed will, on the one hand, firmly fix the shaft in the appropriate position to ensure a tight fit between the shaft and the seal. On the other hand, when the equipment vibrates during operation, these springs can absorb and buffer the vibration energy through their own elastic deformation, reducing the impact of vibration on the seal. Since the elasticity of the first spring 9 and the second spring 14 can adapt to shafts of different sizes and thicknesses, the seal can achieve stable sealing under various working conditions and has good versatility.

[0036] To further eliminate the impact of vibration on the seal, the damping component at the bottom of the seal plays a crucial role. The soft shell 5 isolates the internal damping structure from the external environment, preventing dust and debris from entering without restricting the normal movement of the damping structure. When external vibration is transmitted to the seal, the vibration energy first acts on the damping ring 20 inside the soft shell 5. The damping ring 20 and the damping ring 21 are connected in opposite directions with a flat-topped cone structure. The gap between them allows them to generate relative displacement when subjected to vibration. During the relative displacement, the vibration energy is consumed and dispersed. At the same time, the soft spring inside the support rod 19 located in the center also undergoes elastic deformation, further absorbing the vibration energy. In addition, the positioning rod 7 inside the bottom ring 6 restricts the direction and range of movement of the soft shell 5, ensuring that the entire damping component remains stable during the damping process. Through the coordinated operation of the multi-layer structure, the interference of vibration on the seal is effectively reduced, ensuring that the seal can still maintain good sealing performance under vibration and extending the service life of the seal.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vibration-resistant mechanical seal, comprising a housing (1), characterized in that: A protective shell (15) is fixedly connected to the inner side of the housing (1). Two springs (14) are fixedly connected to the inner side of the protective shell (15). A support plate (12) is fixedly connected to the other end of each of the two springs (14). A limiting block (8) is fixedly connected to the bottom end of the support plate (12). A spring (9) is fixedly connected to the rear end of the limiting block (8). A locking block (10) is fixedly connected to the rear end of the spring (9). A fixing block (11) is fixedly connected to the rear end of the locking block (10). A shock-absorbing component is fixedly connected to the bottom end of the housing (1).

2. The vibration-resistant mechanical seal according to claim 1, characterized in that: The shock-absorbing assembly includes multiple soft shells (5), the front ends of which are fixedly connected to the rear end of the housing (1), and three shock-absorbing rings (20) are slidably connected inside each of the multiple soft shells (5). The bottom ends of the three shock-absorbing rings (20) are fixedly connected to shock-absorbing rings (21), and a support rod (19) is slidably connected inside the shock-absorbing rings (21).

3. The vibration-resistant mechanical seal according to claim 1, characterized in that: The inner side of the card block (10) is rotatably connected to two slide rods (16), and the right ends of the two slide rods (16) are fixedly connected to a connecting plate (18), and the right end of the connecting plate (18) is fixedly connected to a slide rod (17).

4. The vibration-resistant mechanical seal according to claim 3, characterized in that: The outer side of the first slide rod (16) is rotatably connected to the inner side of the limiting block (8), and the outer side of the limiting block (8) is slidably connected to the outer side of the second slide rod (17).

5. The vibration-resistant mechanical seal according to claim 1, characterized in that: A sliding rod (13) is fixedly connected to the top of the support plate (12), and the outer side of the sliding rod (13) is slidably connected to the inside of the protective shell (15).

6. The vibration-resistant mechanical seal according to claim 1, characterized in that: A sealing ring (2) is fixedly connected to the front end of the housing (1), and a sealing strip (3) is fixedly connected to the front end of the sealing ring (2). A moving ring (4) is slidably connected to the outer side of the sealing strip (3).

7. The vibration-resistant mechanical seal according to claim 2, characterized in that: The rear end of the soft shell (5) is fixedly connected to a bottom ring (6), and four positioning rods (7) are slidably connected inside the bottom ring (6).

8. The vibration-resistant mechanical seal according to claim 1, characterized in that: The outer side of the limiting bottom block (8) is slidably connected to the inside of the protective shell (15), and the inside of the protective shell (15) is slidably connected to the outer side of the fixing block (11).

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