Single-end-face packaging type mechanical sealing device

Abstract

The utility model discloses a single end face packaging type mechanical sealing device which comprises a shaft sleeve, a sealing static ring, a sealing movable ring and a connecting disc, the sealing static ring is fixedly installed on the connecting disc, the shaft sleeve is axially connected with a movable ring connecting sleeve in a sliding mode, the shaft sleeve is sleeved with the movable ring connecting sleeve, the sealing movable ring is fixedly installed on the movable ring connecting sleeve, and the movable ring connecting sleeve is connected with the shaft sleeve in a sliding mode. The sealing moving ring abuts against the sealing static ring, the shaft sleeve is provided with an elastic supporting seat, an elastic piece is arranged between the elastic supporting seat and the moving ring connecting sleeve, the moving ring connecting sleeve is provided with a connecting groove, the sealing moving ring is provided with a connector matched with the connecting groove, and the moving ring connecting sleeve is provided with a moving ring sealing ring abutting against the connector. The movable ring connecting sleeve is provided with a movable ring clamping groove, and the connecting sleeve is provided with a movable ring protrusion matched with the movable ring clamping groove. The utility model has the beneficial effects that the structural stability between the sealing moving ring and the moving ring connecting sleeve is improved, and the advantage of better sealing performance is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical sealing devices, specifically to a single-end-face cartridge mechanical sealing device. Background Technology

[0002] A mechanical seal is a shaft sealing device used in rotating fluid machinery, such as centrifugal pumps, centrifuges, reactors, and compressors. Because the drive shaft runs through the inside and outside of the equipment, a circumferential gap exists between the shaft and the equipment. The medium inside the equipment can leak out through this gap, therefore a shaft sealing device is necessary to prevent leakage.

[0003] Chinese utility model patent CN221033966U discloses a bushingless, single-end-face cartridge mechanical seal device, comprising a stationary ring assembly formed by a stationary ring and a stationary ring fixing mechanism, and a rotating ring assembly formed by a rotating ring and a rotating ring fixing mechanism. An adjusting ring is provided on one side of the rotating ring assembly to fix its position, and a cartridge oil pan connected to the equipment is provided on one side of the stationary ring assembly. A positioning card is provided on the rotating ring side, one end of which abuts against the adjusting ring, and the other end of which is connected to the outer tube of the cartridge oil pan. The rotating ring assembly is pressed together using a first fastening screw on the positioning card, forming a single cartridge assembly of the rotating and stationary rings. This allows the company's technicians to achieve the effect of a cartridge seal with a bushing without requiring additional processing of the mechanical seal.

[0004] The sealing performance of a mechanical seal is crucial to its ability to withstand pressure differences between its two ends. With technological advancements, the sealing requirements for mechanical seals are becoming increasingly stringent, and existing mechanical seals are insufficient to meet the operational needs of equipment. Therefore, existing mechanical seals suffer from inadequate sealing performance. Utility Model Content

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a single-end face cartridge mechanical seal device, which includes a bushing, a sealing stationary ring, a sealing dynamic ring and a connecting disc. This single-end face cartridge mechanical seal device has the advantage of good sealing performance.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0007] A single-end face cartridge mechanical seal device includes a bushing, a stationary sealing ring, a rotating sealing ring, and a connecting disc. The stationary sealing ring is fixedly mounted on the connecting disc. A rotating ring connecting sleeve is axially slidably connected to the bushing. The rotating ring connecting sleeve is sleeved on the bushing. The rotating sealing ring is fixedly mounted on the rotating ring connecting sleeve. The rotating sealing ring and the stationary sealing ring abut against each other. An elastic support seat is installed on the bushing. An elastic element is provided between the elastic support seat and the rotating ring connecting sleeve. The rotating ring connecting sleeve has a connecting groove. The rotating sealing ring has a connecting head that mates with the connecting groove. The rotating ring connecting sleeve has a rotating ring sealing ring that abuts against the connecting head. The rotating ring connecting sleeve has a rotating ring retaining groove. The rotating sealing ring has a rotating ring protrusion that mates with the rotating ring retaining groove.

[0008] By setting the rotating ring protrusion into the rotating ring groove, the moving ring can be prevented from moving away from the rotating ring connecting sleeve, thereby improving the structural stability between the rotating ring and the rotating ring connecting sleeve and achieving better sealing performance.

[0009] Preferably, the rotating ring connecting sleeve is located on the side of the sealing rotating ring away from the sealing stationary ring.

[0010] This design allows for a more compact structure with a smaller diameter, making installation easier and reducing the space required.

[0011] Preferably, the side of the moving ring groove away from the sealing stationary ring has an inclined surface, and the end of the inclined surface away from the sealing moving ring is inclined towards the sealing stationary ring.

[0012] This design effectively reduces liquid leakage at the dynamic ring seal, thus improving sealing performance.

[0013] Preferably, the connecting plate is fixedly connected to a container protective sleeve, and the sealing stationary ring, sealing dynamic ring, dynamic ring connecting sleeve and elastic support seat are all located inside the container protective sleeve.

[0014] This setting helps to extend the lifespan of the equipment.

[0015] Preferably, the end of the container protective sleeve away from the connecting plate is provided with a pipe opening, and the bushing is fixedly connected to a positive impeller located inside the pipe opening.

[0016] This design improves the sealing performance.

[0017] Preferably, the container protective sleeve is fixedly connected to a reverse impeller located inside the pipe opening.

[0018] This design causes the liquid at the pipe opening to tend to flow outwards from the protective casing, reducing the pressure of the liquid inside the protective casing. This reduces the pressure difference between the sealing ring and the stationary sealing ring, thereby reducing liquid leakage at the sealing ring and improving the sealing performance.

[0019] Preferably, the reverse impeller is located on the side of the forward impeller away from the connecting disc.

[0020] This configuration reduces the impact of the forward impeller rotation on the liquid outside the container protective sleeve.

[0021] Preferably, the bushing is provided with a keyway, the rotating ring connecting sleeve is equipped with a limiting plate, the limiting plate is provided with a limiting pin inserted into the rotating ring connecting sleeve, the limiting plate is threadedly connected with a stud, the stud is engaged with the end of the limiting pin away from the sealing rotating ring, and the limiting plate is engaged in the keyway.

[0022] This configuration improves the reliability between the limit plate and the moving ring connecting sleeve.

[0023] Preferably, the elastic support seat is fixedly connected to a sliding rod, the sliding rod is slidably connected to a limiting plate, and the elastic element is a spring whose two ends are respectively engaged with the elastic support seat and the limiting plate, and the spring is sleeved on the outer circumferential surface of the sliding rod.

[0024] This configuration improves the stability of the elastic component.

[0025] Preferably, the elastic support seat is fixedly installed with a limiting block, which is engaged in a slot, and the bushing is fixedly installed with a rack located in the keyway, and the limiting block is engaged with the rack.

[0026] This design allows for the use of sealing rings of different sizes, including rotating and stationary rings and elastic components, offering good applicability and ease of maintenance.

[0027] Compared with the prior art, this utility model has achieved beneficial technical effects:

[0028] By designing the connector and connecting groove, the contact surface between the sealing ring and the connecting sleeve is increased, making it difficult for liquid to pass through the gap between them. The connector is inserted into the connecting sleeve, which clamps it securely, ensuring a tight seal while improving structural stability. The protrusion on the rotating ring engages in the groove, preventing the sealing ring from moving away from the connecting sleeve and further enhancing the structural stability between them. This achieves the advantage of superior sealing performance. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the structure of a single-end face container mechanical seal device according to an embodiment of this utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the sealing ring and the ring connecting sleeve in an embodiment of this utility model;

[0031] Figure 3 This is a schematic diagram of the sealing stationary ring and connecting disc in an embodiment of this utility model;

[0032] Figure 4 This is a utility model Figure 1 Enlarged view of point A in the middle.

[0033] The technical features referred to by the various reference numerals in the accompanying drawings are as follows:

[0034] 11. Bushing; 12. Keyway; 13. Limiting plate; 14. Limiting pin; 15. Stud; 16. First sealing ring; 17. Second sealing ring; 21. Sealing stationary ring; 22. Connecting disc; 23. Stationary ring sealing ring; 24. Stationary ring groove; 25. Stationary ring protrusion; 31. Sealing rotating ring; 32. Rotating ring connecting sleeve; 33. Connecting groove; 34. Connecting head; 35. Rotating ring sealing ring; 36. Rotating ring groove; 37. Rotating ring protrusion; 38. Inclined surface; 41. Elastic support seat; 42. Elastic element; 43. Sliding rod; 44. Limiting block; 45. Rack; 51. Container protective sleeve; 52. Pipe opening; 53. Forward impeller; 54. Reverse impeller. Detailed Implementation

[0035] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments. However, the scope of protection of this utility model is not limited to the specific embodiments described below.

[0036] refer to Figure 1-4 A single-end face cartridge mechanical seal device includes a bushing 11, a stationary sealing ring 21, a rotating sealing ring 31, and a connecting disc 22. The stationary sealing ring 21 is fixedly mounted on the connecting disc 22. The rotating ring connecting sleeve 32 is axially slidably connected to the bushing 11 and is sleeved on the bushing 11. The rotating sealing ring 31 is fixedly mounted on the rotating ring connecting sleeve 32, and the rotating sealing ring 31 and the stationary sealing ring 21 abut against each other.

[0037] The bushing 11 has a keyway 12, and the rotating ring connecting sleeve 32 is fitted with a limiting plate 13. The limiting plate 13 has a limiting pin 14 that inserts into the rotating ring connecting sleeve 32. The limiting plate 13 is threadedly connected to a stud 15, which engages with the end of the limiting pin 14 away from the sealing rotating ring 31, and the limiting plate 13 is engaged in the keyway 12. The bushing 11 drives the limiting plate 13 to rotate through the keyway 12, and the limiting plate 13 drives the rotating ring connecting sleeve 32 to rotate through the limiting pin 14, thus achieving synchronous rotation of the bushing 11 and the rotating ring connecting sleeve 32. By tightening the stud 15, the stud 15 presses against the limiting pin 14, preventing the limiting pin 14 from slipping out accidentally and improving the reliability between the limiting plate 13 and the rotating ring connecting sleeve 32. The bushing 11 is fitted with an elastic support 41, and an elastic element 42 is provided between the elastic support 41 and the rotating ring connecting sleeve 32. The elastic support base 41 is fixedly connected to a sliding rod 43, which is slidably connected to a limiting plate 13. The elastic element 42 is a spring with both ends respectively engaged with the elastic support base 41 and the limiting plate 13, and the spring is sleeved on the outer circumferential surface of the sliding rod 43. The sliding rod 43 supports the elastic element 42, improving its stability. A limiting block 44 is fixedly installed on the elastic support base 41, and the limiting block 44 is engaged with a slot. A rack 45 located in the keyway 12 is fixedly installed on the bushing 11, and the limiting block 44 is engaged with the rack 45. The bushing 11 drives the elastic support base 41 to rotate through the limiting block 44.

[0038] The rotating ring connecting sleeve 32 has a connecting groove 33, and the sealing rotating ring 31 has a connecting head 34 that mates with the connecting groove 33. The rotating ring connecting sleeve 32 is located on the side of the sealing rotating ring 31 away from the sealing stationary ring 21. The rotating ring connecting sleeve 32 and the sealing rotating ring 31 are distributed along the axial direction of the bushing 11, resulting in a more compact structure with a smaller diameter, facilitating installation and reducing space occupation. The rotating ring connecting sleeve 32 has a rotating ring sealing ring 35 that abuts against the connecting head 34. The rotating ring connecting sleeve 32 also has a rotating ring groove 36, and the sealing rotating ring 31 has a rotating ring protrusion 37 that mates with the rotating ring groove 36. The rotating ring groove 36 has an inclined surface 38 on the side away from the sealing stationary ring 21, with the end of the inclined surface 38 away from the sealing rotating ring 31 inclined towards the sealing stationary ring 21. The rotating ring groove 36 is located on the side of the rotating ring sealing ring 35 closer to the sealing stationary ring 21.

[0039] The connecting plate 22 is provided with a stationary ring sealing ring 23 that abuts against the stationary sealing ring 21. The connecting plate 22 is provided with multiple stationary ring grooves 24, and the stationary sealing ring 21 is provided with a stationary ring protrusion 25 that mates with the stationary ring grooves 24. The multiple stationary ring grooves 24 are located on two different sides of the stationary sealing ring 21. The arrangement of the stationary ring protrusion 25 and the stationary ring grooves 24 can improve the sealing performance between the stationary sealing ring 21 and the connecting plate 22, and can provide support forces to the stationary sealing ring 21 in different directions through the stationary ring grooves 24 on both sides of the stationary sealing ring 21, effectively improving the structural stability of the stationary sealing ring 21. The rotating ring connecting sleeve 32 is provided with a first sealing ring 16 that abuts against the bushing 11 to prevent liquid leakage through the gap between the rotating ring connecting sleeve 32 and the bushing 11. The inner wall of the bushing 11 is provided with a second sealing ring 17, which abuts against the rotating shaft to prevent liquid leakage through the gap between the bushing 11 and the rotating shaft.

[0040] The connecting plate 22 is fixedly connected to the housing protective sleeve 51. The sealing stationary ring 21, sealing rotating ring 31, rotating ring connecting sleeve 32, and elastic support base 41 are all located inside the housing protective sleeve 51. The housing protective sleeve 51 provides protection for the sealing stationary ring 21, sealing rotating ring 31, rotating ring connecting sleeve 32, and elastic support base 41, thereby improving the service life of the equipment.

[0041] The end of the housing protective sleeve 51 furthest from the connecting plate 22 has a port 52, and a forward impeller 53 is fixedly connected to the bushing 11 inside the port 52. When the main shaft drives the bushing 11 and the forward impeller 53 to rotate, the forward impeller 53 can push the liquid away from the sealing moving ring 31 and the sealing stationary ring 21, making the liquid at the port 52 tend to flow outside the housing protective sleeve 51. This reduces the pressure of the liquid inside the housing protective sleeve 51, thereby reducing the pressure difference between the sealing moving ring 31 and the sealing stationary ring 21, reducing the leakage of liquid at the sealing moving ring 31 and the sealing stationary ring 21, and improving the sealing performance. A reverse impeller 54 is fixedly connected to the housing protective sleeve 51 inside the port 52. There is a gap between the forward impeller 53 and the reverse impeller 54 to prevent collision. The forward impeller 53 has inclined forward blades, and the reverse impeller 54 has inclined reverse blades. The inclination direction of the reverse blades is opposite to that of the forward blades. When the forward impeller 53 rotates, it drives the liquid to move circumferentially along the bushing 11. During this movement, the liquid comes into contact with the reverse impeller 54, which guides the liquid away from the sealing ring 31 and the sealing stationary ring 21. This causes the liquid at the pipe opening 52 to tend to flow towards the outside of the housing protective sleeve 51, thereby reducing the pressure of the liquid inside the housing protective sleeve 51. This reduces the pressure difference between the sealing ring 31 and the sealing stationary ring 21, decreasing leakage at these points and improving sealing performance. The reverse impeller 54 is located on the side of the forward impeller 53 away from the connecting plate 22. When the forward impeller 53 rotates, the liquid around it flows in the direction of rotation. The fixed reverse impeller 54 prevents the liquid from flowing away from the sealing ring 31, reducing the impact of the forward impeller 53's rotation on the liquid outside the housing protective sleeve 51.

[0042] The connecting plate 22 is fixedly installed on the equipment housing, and the bushing 11 is fixedly installed on the equipment shaft and rotates with the shaft. The elastic element 42 pushes the moving ring connecting sleeve 32 and the sealing moving ring 31 towards the sealing stationary ring 21, so that the sealing moving ring 31 and the sealing stationary ring 21 are kept in a tight state, and the sealing moving ring 31 and the sealing stationary ring 21 block the liquid, thus achieving the sealing function.

[0043] This embodiment has the following advantages:

[0044] The connection head 34 and the connecting groove 33 increase the contact surface between the sealing ring 31 and the ring connecting sleeve 32, making it difficult for liquid to pass through the gap between them. The connector 34 is inserted into the ring connecting sleeve 32, which clamps it tightly, ensuring a tight seal and improving structural stability. The ring protrusion 37 engages with the ring retaining groove 36, preventing the sealing ring 31 from moving away from the ring connecting sleeve 32 and further enhancing the structural stability between them. This achieves the advantage of superior sealing performance.

[0045] When the rotating ring 31 rotates with the shaft and bushing 11, the liquid in the rotating ring groove 36 will move towards the top of the rotating ring due to centrifugal force. The inclined surface 38 inclined towards the stationary ring 21 can guide the liquid to move away from the rotating ring seal 35 against the pressure of the liquid. This can reduce the liquid pressure at the rotating ring seal 35 when the shaft rotates, effectively reduce the liquid leakage at the rotating ring seal 35, and improve the sealing performance.

[0046] When installing sealing rings 31, stationary rings 21, and elastic elements 42 of different sizes, the position of the elastic support 41 needs to be adjusted appropriately so that the elastic support 41 can push the sealing ring 31 and the stationary ring 21 tightly together through the elastic element 42. During the installation of the elastic support 41, first slide the limiting block 44 in the keyway 12 to adjust it to a suitable position. Then, press the limiting block 44 towards the rack 45 to engage it with the rack 45. Finally, fix the elastic support 41 onto the limiting block 44. This allows for adjustment of the position of the elastic support 41, making it suitable for sealing rings 31, stationary rings 21, and elastic elements 42 of different sizes, providing good applicability and ease of maintenance.

[0047] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the utility model.

Claims

1. A single-end-face cartridge mechanical seal device, characterized in that: The assembly includes a bushing (11), a stationary sealing ring (21), a rotating sealing ring (31), and a connecting disc (22). The stationary sealing ring (21) is fixedly mounted on the connecting disc (22). The bushing (11) is axially slidably connected to a rotating ring connecting sleeve (32), which is sleeved on the bushing (11). The rotating sealing ring (31) is fixedly mounted on the rotating ring connecting sleeve (32), and the rotating sealing ring (31) and the stationary sealing ring (21) abut against each other. The bushing (11) is equipped with an elastic support seat (41). An elastic element (42) is provided between the elastic support base (41) and the moving ring connecting sleeve (32). The moving ring connecting sleeve (32) is provided with a connecting groove (33). The sealing moving ring (31) is provided with a connector (34) that mates with the connecting groove (33). The moving ring connecting sleeve (32) is provided with a moving ring sealing ring (35) that abuts against the connector (34). The moving ring connecting sleeve (32) is provided with a moving ring groove (36). The sealing moving ring (31) is provided with a moving ring protrusion (37) that mates with the moving ring groove (36).

2. The single-end face cartridge mechanical seal device according to claim 1, characterized in that: The moving ring connecting sleeve (32) is located on the side of the sealing moving ring (31) away from the sealing stationary ring (21).

3. The single-end face cartridge mechanical seal device according to claim 2, characterized in that: The moving ring groove (36) has an inclined surface (38) on the side away from the sealing stationary ring (21), and the end of the inclined surface (38) away from the sealing moving ring (31) is inclined towards the sealing stationary ring (21).

4. The single-end-face cartridge mechanical seal device according to claim 1, characterized in that: The connecting plate (22) is fixedly connected to the container protective sleeve (51), and the sealing stationary ring (21), sealing dynamic ring (31), dynamic ring connecting sleeve (32) and elastic support seat (41) are all located inside the container protective sleeve (51).

5. The single-end-face cartridge mechanical seal device according to claim 4, characterized in that: The container protective sleeve (51) has a port (52) at one end away from the connecting plate (22), and the bushing (11) is fixedly connected to a positive impeller (53) located inside the port (52).

6. The single-end-face cartridge mechanical seal device according to claim 5, characterized in that: The container protective sleeve (51) is fixedly connected to a reverse impeller (54) located inside the pipe opening (52).

7. The single-end face cartridge mechanical seal device according to claim 6, characterized in that: The reverse impeller (54) is located on the side of the forward impeller (53) away from the connecting disc (22).

8. The single-end-face cartridge mechanical seal device according to claim 1, characterized in that: The bushing (11) is provided with a keyway (12), the rotating ring connecting sleeve (32) is equipped with a limiting plate (13), the limiting plate (13) is provided with a limiting pin (14) inserted into the rotating ring connecting sleeve (32), the limiting plate (13) is threadedly connected with a stud (15), the stud (15) and the end of the limiting pin (14) away from the sealing rotating ring (31) are engaged, and the limiting plate (13) is engaged in the keyway (12).

9. The single-end-face cartridge mechanical seal device according to claim 8, characterized in that: The elastic support base (41) is fixedly connected to a sliding rod (43), the sliding rod (43) is slidably connected to the limiting plate (13), and the elastic element (42) is a spring whose two ends are respectively engaged with the elastic support base (41) and the limiting plate (13), and the spring is sleeved on the outer circumferential surface of the sliding rod (43).

10. The single-end face cartridge mechanical seal device according to claim 1, characterized in that: The elastic support base (41) is fixedly installed with a limiting block (44), which is inserted into a slot. The bushing (11) is fixedly installed with a rack (45) located in the keyway (12), and the limiting block (44) and the rack (45) are engaged.

Images