A corrugated pipe end face sealing device of a multifunctional reaction kettle

Abstract

The utility model provides a kind of bellows end face sealing device of multifunctional reaction kettle, including equipment main shaft, shaft sleeve, kettle mouth flange, static ring component, dynamic ring component and bearing assembly, wherein static ring component is fixed in kettle mouth flange by static ring seat, dynamic ring component adopts four fluorine bellows dynamic ring, its one end is realized elastic support by half ring and spring seat, other end and static ring end face contact form main sealing pair;The inside of the one end of shaft sleeve extended by bellows dynamic ring is equipped with first sealing ring, filled between bellows dynamic ring, shaft sleeve and equipment main shaft, effectively prevent medium along shaft leakage.The utility model adopts four fluorine bellows dynamic ring to replace metal bellows dynamic ring, under the premise of not affecting sealing capacity, cost is greatly simplified.Bellows dynamic ring can adapt to the radial runout and axial offset of main shaft, realize continuous sealing under dynamic condition, with the advantages of long life, strong sealing capacity, strong yaw capacity, especially suitable for harsh working condition of multifunctional reaction kettle.

Description

Technical Field

[0001] This utility model relates to a mechanical seal, and more particularly to a bellows end face sealing device for a multifunctional reactor. Background Technology

[0002] Multifunctional reactors are common in chemical and pharmaceutical applications. Because they perform multiple processes such as filtration, washing, and drying, they are also known as three-in-one reactors. Mechanical seals are an indispensable component of these reactors. Compared to conventional reactors, multifunctional reactors place significantly higher demands on their mechanical seals. Firstly, during different process stages, the main shaft of the equipment needs frequent and significant vertical movement. This causes not only circumferential rotational displacement but also substantial axial displacement of the mechanical seal. This axial displacement places extremely high demands on the mechanical seal, rendering ordinary mechanical seals ineffective. Secondly, corrosive media are typically generated during the operation of multifunctional reactors. Over time, these media can corrode the components of the mechanical seal, thus affecting its lifespan.

[0003] Traditional technologies typically employ a metal bellows mounted on the outside of the bushing to reduce bushing runout due to the high strength of the bellows. However, as mentioned above, the medium can easily corrode the metal bellows and bushing, reducing the lifespan of the mechanical seal. Furthermore, metal bellows are relatively expensive, with a single bellows accounting for a significant portion of the mechanical seal's cost, placing a heavy burden of maintenance costs on users.

[0004] The applicant provided a three-in-one mechanical seal device for a reactor in the utility model publication CN221857532U. It uses a lower auxiliary sealing structure to fix the position of the end of the bushing and isolate the bushing from the sealing part. This sealing structure is set separately from the main sealing structure, which has the problem of difficult installation.

[0005] In view of the above-mentioned existing technology, it is necessary to improve the sealing device of the multifunctional reactor. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a bellows end face sealing device for a multifunctional reactor, including a main shaft and a bushing sleeved on the outside of the main shaft. Along the outside of the main shaft from the medium end to the atmosphere end, a reactor port flange, a stationary ring assembly, a dynamic ring assembly, and a bearing assembly are arranged sequentially. The stationary ring assembly includes a stationary ring seat and a stationary ring, which is connected to the reactor port flange via the stationary ring seat. The dynamic ring assembly includes a bellows dynamic ring, a half ring, and a spring seat. One end of the half ring is fixedly connected to the bushing sleeve by bolts, and the other end is connected to the spring seat via a spring. One end of the bellows dynamic ring is located inside the half ring, and the other end is located inside the spring seat and contacts the end face of the stationary ring to form a main sealing pair. The bellows dynamic ring is a PTFE bellows, with one end extending out of the bushing sleeve. A first sealing ring is provided on the inner side of the end extending out of the bushing sleeve, and the first sealing ring fills the space between the bellows dynamic ring, the bushing, and the main shaft.

[0007] Furthermore, the first sealing ring is made of polytetrafluoroethylene body combined with polyimide or carbon fiber reinforced material.

[0008] Furthermore, at least one set of second sealing rings is provided between the bellows rotating ring and the main shaft of the equipment, and the second sealing ring and the first sealing ring form a series sealing structure.

[0009] Furthermore, the bearing assembly includes a housing, the interior of which is an inner cavity for accommodating the bearing; a sealing box is press-fitted between the housing and the stationary ring seat, and the housing and the stationary ring seat are fastened together by bolts.

[0010] Furthermore, the bearings are in multiple sets, with oil retaining rings between adjacent bearings, and the oil retaining rings have an interlaced labyrinth structure.

[0011] Furthermore, the bearing assembly is provided with a lip seal at one end of the housing near the bearing, and the lip seal is located on the outside of the bushing.

[0012] Furthermore, a transmission sleeve is also installed on the bushing, and an axially extending keyway is milled on the outer surface of the main shaft. The inner side of the bushing is connected to the keyway through the transmission sleeve.

[0013] Furthermore, a positioning card is provided on the outer side of the housing near the atmosphere. The positioning card is interference-fitted with the outer side of the bushing and fixedly connected to the outer side of the housing by fastening bolts.

[0014] Furthermore, copper bushings are inlaid on the inner sides of both ends of the bushing.

[0015] Furthermore, a retaining ring is provided on the side of the stationary ring near the stationary ring seat, and a groove for inserting the retaining ring is provided on the side of the stationary ring seat.

[0016] This invention provides a bellows end face sealing device for a multifunctional reactor, including a main shaft, a bushing, a reactor flange, a stationary ring assembly, a rotating ring assembly, and a bearing assembly. The stationary ring assembly is fixed to the reactor flange by a stationary ring seat. The rotating ring assembly uses a PTFE bellows rotating ring, one end of which is elastically supported by a half ring and a spring seat, while the other end contacts the end face of the stationary ring to form a main sealing pair. A first sealing ring is provided on the inner side of the end of the bellows rotating ring extending from the bushing, filling the space between the bellows rotating ring, the bushing, and the main shaft, effectively preventing media leakage along the shaft. This structure replaces the spring compensation system in traditional technology with a bellows, possessing excellent corrosion resistance and self-adaptive capabilities. It maintains sealing reliability even when the main shaft wobbles, while simplifying the axial sealing structure and improving service life and installation convenience under corrosive conditions.

[0017] This invention uses a PTFE bellows moving ring instead of a metal bellows moving ring, significantly simplifying costs without affecting sealing performance. The bellows moving ring can adapt to the radial runout and axial offset of the spindle, achieving continuous sealing under dynamic operating conditions. It has the advantages of long service life, strong sealing ability, and strong yaw resistance, making it particularly suitable for the harsh operating conditions of multifunctional reactors. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a bellows end face sealing device for a multifunctional reaction vessel according to this utility model;

[0019] Figure 2 This is a schematic diagram showing the connection between the bushing and the main shaft drive of the equipment;

[0020] Figure 3 This is a schematic diagram of the seal between the bellows rotating ring and the main shaft of the equipment.

[0021] Reference numerals in the attached drawings: 1. Main shaft of equipment; 2. Shaft sleeve; 3. Flange of vessel mouth; 4. Stationary ring; 5. Stationary ring seat; 6. Retaining ring; 7. First sealing ring; 8. Bellows moving ring; 9. Half ring; 10. Spring seat; 11. First sealing ring; 12. Second sealing ring; 13. Bearing; 14. Sealing box; 15. Middle pressure cap; 16. End pressure cap; 17. Oil inlet; 18. Exhaust port; 19. Liquid inlet; 20. Liquid outlet; 21. Lip seal; 22. Copper sleeve; 23. Transmission sleeve; 24. Positioning card; 25. Detailed Implementation

[0022] like Figures 1 to 3The multifunctional reactor bellows end-face sealing device shown is suitable for three-in-one reactors that include filtration, washing, and drying processes. It includes a main shaft 1, with a bushing 2 mounted on the outer side of the main shaft 1. The two ends of the main shaft 1 are the media end and the atmospheric end. Along the outer side of the main shaft 1, from the media end to the atmospheric end, are sequentially arranged a bearing assembly, a dynamic ring assembly, a stationary ring assembly, and a reactor flange 3. The stationary ring assembly and the elastic end of the dynamic ring assembly are in contact, forming an end-face sealing pair for the media.

[0023] The vessel flange 3 is the connection interface between the entire sealing device and the reactor, and it is fixed by bolts. In order to adapt to the working environment of the multifunctional reactor, the vessel flange 3 is made of glass-lined or reinforced polytetrafluoroethylene material. When facing the medium inside the reactor, the vessel flange 3 can provide a corrosion-resistant barrier to protect other metal parts.

[0024] The stationary ring assembly is the stationary part of the sealing pair, providing a stationary sealing end face for the entire sealing device. The stationary ring assembly includes a stationary ring 4 and a stationary ring seat 5. The stationary ring seat 5 is press-fitted onto the outside of the stationary ring 4 and bolted to the vessel flange 3. The stationary ring seat 5 is a supporting and positioning component for the stationary ring 4. A retaining ring 6 is provided on the side of the stationary ring 4 near the stationary ring seat 5, and a groove for the retaining ring 6 to be inserted is provided on the side of the stationary ring seat 5. The retaining ring 6 is an axial positioning component for the stationary ring 4, and a portion of it is restricted by the groove, forming a step. The retaining ring 6 is inserted into the stationary ring seat 5, and then the stationary ring 4 is placed on the retaining ring 6. The stationary ring 4 is supported by the retaining ring 6 and naturally confined within the stationary ring seat 5. The stationary ring seat 5, stationary ring 4, and retaining ring 6 constitute a complete stationary ring assembly, thus completing the pre-assembly of the stationary ring assembly. Then, the stationary ring seat 5 is bolted to the vessel flange 3, and the stationary ring 4 is press-fitted between the stationary ring seat 5 and the main shaft 1 of the equipment. Furthermore, first sealing rings 7 are respectively provided between the stationary ring seat 5, the stationary ring 4, and the vessel flange 3. These first sealing rings 7 form multiple static seals from different positions, which enhances the connection stability and sealing performance between the three.

[0025] The moving ring assembly includes a bellows moving ring 8 and a half ring 9. One end of the half ring 9 is fixedly connected to the bushing 2 by bolts, and the other end is connected to a spring seat 11 by a spring 10. Both the half ring 9 and the spring seat 11 are used to fix the position of the bellows moving ring 8. One end of the bellows moving ring 8 is located inside the half ring 9 and extends beyond the end of the bushing 2, locking the movement of the half ring 9. The other end of the bellows moving ring 8 is located inside the spring seat 11 and contacts the surface of the stationary ring 4, maintaining a dynamic seal for the medium inside the reactor. The spring seat 11 moves dynamically with the bellows moving ring 8. The expansion and contraction characteristics of the bellows moving ring 8 can automatically compensate for the axial movement of the main shaft, and the flexibility of the bellows can adapt to the radial runout and angular offset of the main shaft.

[0026] A first sealing ring 12 is provided on the inner side of one end of the bellows moving ring 8 extending from the bushing 2. The first sealing ring 12 fills the space between the bellows moving ring 8, the bushing 2, and the main shaft 1 of the equipment. The first sealing ring 12 is made of a polymer material, such as polyimide, carbon fiber, etc., combined with polytetrafluoroethylene. It has good chemical corrosion resistance, wear resistance, and high strength, and can maintain sealing ability in various environments without its service life decreasing due to media corrosion. At the same time, the first sealing ring 12 is pressed between the bellows moving ring 8 and the bushing 2, and can replace the bushing 2 in contact with the main shaft, preventing the media in the reactor from leaking and causing corrosion of the bushing 2.

[0027] At least one set of second sealing rings 13 is also provided between the bellows moving ring 8 and the equipment main shaft 1. The second sealing ring 13 can fill the gap between the bellows moving ring 8 and the equipment main shaft 1. It is connected in series with the first sealing ring 12 to enhance the sealing of the bellows moving ring 8 to the equipment main shaft 1, ensure that the medium will not leak axially through the equipment main shaft 1, and thus enhance the sealing performance of the first sealing ring 12.

[0028] The bearing assembly is a box-shaped structure, with the bearing 14 housed inside. A sealing box 15 is provided between the box and the stationary ring seat 5, and is connected to the stationary ring seat 5 and the vessel flange 3 by fastening screws, making the entire sealing device a complete sealing unit. After tightening the fastening screws, the box will apply axial pressure to the stationary ring seat 5 through the sealing box 15, ensuring a tight connection between the stationary ring seat 5 and the vessel flange 3. The box specifically includes a central pressure cover 16 and end pressure covers 17 located at both ends of the central pressure cover 16. The box is assembled into a complete box-type structure by fastening screws, forming an internal cavity to accommodate the bearing 14. The end pressure covers 17 and the central pressure cover 16 are detachable, facilitating the replacement and maintenance of the bearing 14.

[0029] like Figure 1 As shown, an oil inlet 18 is provided on the outer side of the housing, which is connected to the inner cavity. Lubricating oil can be injected into the inner cavity through the oil inlet 18 to lubricate the bearing 14. The housing is further provided with an exhaust port 19 that is connected to the inner cavity to maintain the pressure balance in the inner cavity.

[0030] The housing is also provided with an inlet 20 and an outlet 21 that connect to the inside of the sealing box 15, for introducing and discharging sealing fluid into the sealing box 15. The sealing fluid is blocked by the sealing interface of the stationary ring 4 and will not leak into the main shaft 1 of the equipment.

[0031] In this embodiment, to adapt to the application scenarios of the multifunctional reactor, two sets of bearings 14 arranged axially are arranged inside the housing. The outer end faces of the bearings 14 contact the bushings 2, providing a transition between the rotating and stationary parts, ensuring precise alignment between the rotating and stationary parts, and reducing vibration generated by the sealing device during operation. An oil baffle ring is provided between the two sets of bearings 14. The oil baffle ring is arranged in a staggered labyrinthine pattern, allowing the lubricating oil to remain within the lubrication area of ​​each bearing 14, preventing it from flowing into other areas. A lip seal 22 is also provided at the end of the housing near the bearings 14. The lip seal 22 is located on the outside of the bushing 2 and is used to seal the lubricant between the bushing 2 and the housing. Simultaneously, the lip seal 22 on the side of the housing near the sealing box 15 can isolate the sealing fluid inside the sealing box 15. The lip seal 22 is also made of wear-resistant material, and a wear-resistant coating or plating is provided on the surface of the bushing 2 that contacts the lip seal 22, reducing wear between the lip seal 22 and the bushing 2 while ensuring sealing capability.

[0032] Furthermore, copper sleeves 23 are inlaid on the inner sides of both ends of the bushing 2. The copper sleeves 23 have the characteristics of wear resistance and low coefficient of friction. When axial displacement occurs, the copper sleeves 23 can reduce the friction between the bushing 2 and the spindle, thus protecting the spindle and the bushing 2.

[0033] Furthermore, a transmission sleeve 24 is also installed on the bushing 2. An axially extending keyway is milled on the outer surface of the main shaft. The inner side of the bushing 2 is connected to the keyway through the transmission sleeve 24. The axial length of the milled groove can be set according to specific requirements, so that the bushing 2 can slide up and down relative to the main shaft.

[0034] Furthermore, a positioning card 25 is provided on the outer side of the housing near the atmosphere. The positioning card 25 is interference-fitted with the outer side of the bushing 2 and fixedly connected to the outer side of the housing by fastening bolts. When the fastening bolts are tightened, the entire sealing device is pressed towards the equipment end, and the housing, sealing box 15, and other stationary components are firmly locked onto the bushing 2. The entire device forms a modular unit, which can be pre-assembled in the factory. The components will not separate during transportation, thus ensuring the integrity of the entire sealing device.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A bellows end face sealing device for a multifunctional reactor, comprising a main shaft (1) and a bushing (2) sleeved on the outside of the main shaft (1), characterized in that: Along the outer side of the main shaft (1) of the equipment, from the medium end to the atmosphere end, the vessel port flange (3), the stationary ring assembly, the dynamic ring assembly and the bearing assembly are arranged in sequence. The stationary ring assembly includes a stationary ring seat (5) and a stationary ring (4). The stationary ring (4) is connected to the vessel port flange (3) through the stationary ring seat (5). The moving ring assembly includes a bellows moving ring (8), a half ring (9), and a spring seat (11). One end of the half ring (9) is fixedly connected to the bushing (2) by bolts, and the other end is connected to the spring seat (11) by spring (10). One end of the bellows moving ring (8) is located inside the half ring (9), and the other end is located inside the spring seat (11) and contacts the end face of the stationary ring (4) to form a main sealing pair. The bellows moving ring (8) is a PTFE bellows, one end of which extends out of the bushing (2), and a first sealing ring (12) is provided inside the end of the bushing (2). The first sealing ring (12) fills the space between the bellows moving ring (8), the bushing (2), and the main shaft (1) of the equipment.

2. The bellows end face sealing device for a multifunctional reactor as described in claim 1, characterized in that: The first sealing ring (12) is made of polytetrafluoroethylene body and polyimide or carbon fiber reinforced material.

3. The bellows end face sealing device for a multifunctional reactor as described in claim 2, characterized in that: At least one set of second sealing rings (13) is provided between the bellows moving ring (8) and the main shaft (1) of the equipment. The second sealing ring (13) and the first sealing ring (12) form a series sealing structure.

4. The bellows end face sealing device for a multifunctional reactor as described in claim 1, characterized in that: The bearing assembly includes a housing, the interior of which is an inner cavity for accommodating the bearing (14); a sealing box (15) is press-fitted between the housing and the stationary ring seat (5), and the housing and the stationary ring seat (5) are fastened together by bolts.

5. The bellows end face sealing device for a multifunctional reactor as described in claim 4, characterized in that: The bearings (14) are in multiple sets, with oil baffles between adjacent bearings (14), and the oil baffles have an interlaced labyrinth structure.

6. The bellows end face sealing device for a multifunctional reactor as described in claim 4, characterized in that: The bearing assembly is further provided with a lip seal (22) at one end of the housing near the bearing (14), and the lip seal (22) is located on the outside of the bushing (2).

7. The bellows end face sealing device for a multifunctional reactor as described in claim 1, characterized in that: A transmission sleeve (24) is also installed on the bushing (2). An axially extending keyway is milled on the outer surface of the spindle. The inner side of the bushing (2) is connected to the keyway through the transmission sleeve (24).

8. The bellows end face sealing device for a multifunctional reactor as described in claim 4, characterized in that: A positioning card (25) is provided on the outer side of the housing near the atmosphere. The positioning card (25) is interference-fitted with the outer side of the bushing (2) and fixedly connected to the outer side of the housing by fastening bolts.

9. The bellows end face sealing device for a multifunctional reactor as described in claim 1, characterized in that: The inner sides of both ends of the bushing (2) are fitted with copper bushings (23).

10. The bellows end face sealing device for a multifunctional reactor as described in claim 1, characterized in that: A retaining ring (6) is provided on the side of the stationary ring (4) near the stationary ring seat (5), and a groove for inserting the retaining ring (6) is provided on the side of the stationary ring seat (5).

Images