Stirring shaft sealing device

Abstract

A stirring shaft sealing device belongs to the technical field of sealing and comprises a sealing cavity formed by combining an upper sealing cylinder and a lower sealing cylinder, and a stirring shaft of a stirring tank penetrates through the sealing cavity; a center positioning cylinder is arranged on the lower portion of the lower sealing cylinder, a mounting hole allowing a stirring shaft to penetrate through is formed in the bottom of the center positioning cylinder, a vibration reduction sealing assembly composed of a shaft chuck, a vibration reduction connecting piece, a movable sealing disc and a static sealing disc is further arranged in the sealing cavity, and a closed cavity is formed between the vibration reduction sealing assembly and the center positioning cylinder. And the closed cavity and the sealed chamber are communicated with each other and are filled with lubricating oil. Compared with a traditional liquid sealing device, the sealing device has the advantages that the sealing effect is better, the production and maintenance cost is low, and potential environmental protection, safety and health risks such as site pollution and poisoning are eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of sealing, and in particular to a stirring shaft sealing device. Background Art

[0002] The agitator shaft of the existing mixing tank usually needs to be equipped with a sealing device to ensure the airtightness inside the tank body, to prevent external gas from entering the tank body and affecting the reaction inside the tank; at the same time, it can also prevent harmful polluted gases in the tank from overflowing from the agitator shaft, polluting the surrounding environment and damaging the health of the staff. At present, the sealing form of the agitator shaft of the mixing tank mostly adopts the traditional liquid sealing device, and common liquid media include water, lubricating oil, mercury, etc.; in actual production applications, the above liquid media are consumables, which need to be frequently supplemented according to the consumption, and the maintenance cost is high; and the volatilized liquid medium pollutes the on-site environment, and there is a great safety risk at the production site. In particular, some application scenarios with high sealing requirements can only use high-density mercury seals, but the mercury vapor volatilized by mercury seals is highly toxic, and there is a great safety risk at the production site. According to relevant national laws and regulations, the production, transportation, and use of mercury have been included in the national controlled substances. Therefore, mercury seals are no longer suitable for industrial shaft seals. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a stirring shaft sealing device with good sealing effect, low maintenance cost and no pollution.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A stirring shaft sealing device comprises a sealing flange, wherein an upper and a lower sealing cylinder are respectively provided with a fixed upper sealing cylinder and a lower sealing cylinder above and below the sealing flange, wherein the lower sealing cylinder is installed on the top cover of the stirring tank, and the upper and lower sealing cylinders are combined to form a sealing chamber through which the stirring shaft can pass; a center positioning cylinder sleeved outside the stirring shaft is provided in the sealing chamber, wherein the center positioning cylinder is located at the lower part of the sealing chamber and extends upward, and a fixed flange is connected to the bottom of the center positioning cylinder, wherein the fixed flange is located between the top cover of the stirring tank and the base of the lower sealing cylinder, and the fixed flange is fixedly connected to the top cover of the stirring tank and the base of the lower sealing cylinder; a mounting hole is provided at the bottom of the center positioning cylinder for the stirring shaft to pass through; its structural feature is that a vibration-damping sealing assembly is also provided in the sealing chamber, and the vibration-damping sealing assembly includes an assembly arranged at the center positioning cylinder The shaft chuck above the positioning cylinder is connected to the stirring shaft and rotates in fit with the stirring shaft; a static sealing disk is provided in the sealing chamber and is arranged between the lower sealing cylinder and the center positioning cylinder, and the inner and outer sides of the static sealing disk are respectively abutted against the center positioning cylinder and the lower sealing cylinder, and the bottom surface of the static sealing disk is abutted against the base of the lower sealing cylinder; a dynamic sealing disk is provided above the static sealing disk, and the dynamic sealing disk is sleeved outside the center positioning cylinder and is rotatably connected to the static sealing disk, and the shaft chuck and the dynamic sealing disk are elastically connected by a vibration-damping connecting piece; when the stirring shaft rotates, the shaft chuck, the vibration-damping connecting piece and the dynamic sealing disk rotate synchronously with the stirring shaft; a closed cavity is formed between the shaft chuck, the vibration-damping connecting piece, the dynamic sealing disk and the center positioning cylinder, and the closed cavity is filled with lubricating oil to prevent the gas in the stirring tank from communicating with the outside.

[0005] Furthermore, the inner diameter of the center positioning cylinder is 15mm-20mm larger than the diameter of the stirring shaft, so that the stirring shaft can easily pass through the middle of the center positioning cylinder, reducing the difficulty of assembly, and keeping the cylinder wall of the center positioning cylinder away from the lateral swing range of the stirring shaft to avoid bumps and scratches.

[0006] Furthermore, the vibration-damping connecting piece is made of fluororubber or polytetrafluoroethylene.

[0007] Furthermore, a plurality of annular sealing grooves are provided on the inner side wall of the shaft chuck and are arranged at intervals along the circumference of the stirring shaft. The annular sealing grooves are filled with fillers, such as O-rings, raw tape, 1596 silicone sealant, etc., to further enhance the sealing effect between the shaft chuck and the stirring shaft.

[0008] Furthermore, a plurality of grooves distributed at intervals are provided on the bottom surface of the static sealing disk, and a raised nut which can be embedded in the groove of the bottom surface of the static sealing disk is provided on the base of the lower sealing cylinder for locking cooperation. Preferably, the static sealing disk is made of fluororubber or polytetrafluoroethylene material to improve its high temperature resistance, self-lubrication, wear resistance and corrosion resistance.

[0009] Furthermore, the upper sealing cylinder and the lower sealing cylinder are assembled cylinders, which are convenient for disassembly and installation during later maintenance. Preferably, the upper sealing cylinder and the lower sealing cylinder are longitudinally symmetrically divided into a first cylinder and a second cylinder, and the first cylinder and the second cylinder are sealed and connected by a flange to form a sealed chamber.

[0010] Furthermore, a stuffing box is provided between the top cover of the upper sealing cylinder and the stirring shaft, and an annular flange extending laterally toward the stirring shaft is provided at the bottom of the stuffing box. An upper sealing cavity is formed between the stuffing box, the annular flange and the stirring shaft. The upper sealing cavity is filled with stuffing packing, and a pressure cover for pressing the stuffing packing is provided at the upper opening of the stuffing box.

[0011] Furthermore, the upper surface of the static sealing disk is a bowl-shaped groove, and the lower surface of the dynamic sealing disk is a bowl-shaped protrusion that cooperates with the static sealing disk, so that the dynamic sealing disk can be automatically adjusted to the center during assembly, thereby ensuring the concentricity of the dynamic sealing disk and the static sealing disk after assembly; the shape of the contact surface of the dynamic sealing disk and the static sealing disk can be other shapes besides the bowl shape, such as a triangle, a rectangle, an inverted cone, etc., as long as the concentricity during assembly can be ensured.

[0012] Furthermore, a gap is left between the dynamic sealing disk and the center positioning cylinder, and a sealing liquid channel is formed between the center positioning cylinder, the vibration-damping connecting piece, the dynamic sealing disk, and the static sealing disk. The closed cavity, the sealing liquid channel, and the sealing chamber are connected to form a liquid sealing cavity. The liquid sealing cavity is filled with lubricating oil, which is beneficial to improving the lubrication of each component during relative rotation, reducing friction, reducing frictional heat, and improving the sealing effect.

[0013] Furthermore, an annular groove is provided on the upper surface of the static sealing disk, and an annular protrusion corresponding to the annular groove on the static sealing disk is provided on the lower surface of the dynamic sealing disk. The annular protrusion on the dynamic sealing disk is embedded in the annular groove of the static sealing disk to stop each other. The annular groove is filled with lubricating oil to further improve the sealing effect. More preferably, a plurality of annular grooves are provided on the static sealing disk, and the plurality of annular grooves are evenly arranged on the upper surface of the static sealing disk.

[0014] Furthermore, a stop ring is provided in the sealing chamber and is arranged around the dynamic sealing disk, and the stop ring provides axial positioning for the dynamic sealing disk.

[0015] Furthermore, the vibration-damping sealing assembly also includes a vibration-damping buffer, which includes a first pusher claw and a second pusher claw, the first pusher claw is fixedly connected to the shaft chuck, the second pusher claw is fixedly connected to the dynamic sealing disk, and the first pusher claw and the second pusher claw are elastically connected by an elastic member; the elastic member can be a spring or a rubber block or an air spring; preferably, a plurality of vibration-damping buffer members are arranged evenly and symmetrically with the stirring shaft as the axis, so as to achieve symmetrical torque balance and uniform force.

[0016] Furthermore, the roughness of the contact surfaces of the center positioning cylinder, the lower sealing cylinder base, the sealing chamber side wall and the static sealing disk is 1.8-1.6 μm, so as to further improve the sealing effect.

[0017] Furthermore, an observation window is provided on the side wall of the sealing chamber, which is convenient for observing the operating status of the sealing device, timely discovering potential faults and sealing leakage, and facilitating inspection and maintenance of the equipment.

[0018] After adopting the above structure, the dynamic sealing disc and the static sealing disc form a mechanical dynamic sealing structure. The liquid sealing cavity formed by the closed cavity, the sealing liquid channel and the sealing chamber is filled with lubricating oil for sealing. The upper sealing cylinder and the stirring shaft are sealed by a stuffing seal box. A good sealing effect is achieved through triple sealing. No toxic gas will be emitted to the surrounding area, and there is no need to frequently replenish the sealing liquid. It is easy to use and maintain.

[0019] Compared with the prior art, the present invention has the following beneficial effects: The stirring shaft sealing device of the present invention has a triple sealing mechanism of a mechanical dynamic seal of a dynamic and static sealing disc structure, a sealing liquid seal and a stuffing seal box structure. Compared with traditional liquid sealing devices, it has better sealing effect, greatly reduces production and maintenance costs, and completely eliminates potential environmental protection, safety and health risks such as pollution and poisoning at the production operation site. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention; Figure 1 In: 1. Sealing flange; 2. Upper sealing cylinder; 3. Lower sealing cylinder; 4. Top cover of mixing tank; 5. Sealing chamber; 6. Mixing shaft; 7. Center positioning cylinder; 8. Fixed flange; 9. Elastic member; 10. Shaft chuck; 11. Static sealing disc; 12. Dynamic sealing disc; 13. Vibration-damping connector; 14. Stuffing box; 15. Annular ridge; 16. Enclosed cavity; 17. Lubricating oil; 18. Annular sealing groove; 19. Packing; 20. Pressure cover; 21. Annular groove; 22. Stop ring; 23. First pusher claw; 24. Second pusher claw. DETAILED DESCRIPTION

[0021] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0022] Reference Figure 1 A stirring shaft sealing device comprises a sealing flange 1, wherein an upper sealing cylinder 2 and a lower sealing cylinder 3 are respectively arranged above and below the sealing flange 1, and the lower sealing cylinder 3 is installed on a top cover 4 of a stirring tank. The upper sealing cylinder 2 and the lower sealing cylinder 3 are connected and assembled to form a sealing chamber 5, and a stirring shaft 6 can pass through the sealing chamber 5; a center positioning cylinder 7 is arranged in the sealing chamber 5, and the center positioning cylinder 7 is sleeved on the outside of the stirring shaft 6, that is, the stirring shaft 6 passes through the center positioning cylinder 7, and the center positioning cylinder 7 is located at the lower part of the sealing chamber 5 and extends upward, such as Figure 1 As shown, the center positioning cylinder 7 extends upward to the sealing chamber 5 surrounded by the upper sealing cylinder 2, and the bottom of the center positioning cylinder 7 is connected to a fixing flange 8, as shown in FIG. Figure 1 As shown, the fixed flange 8 is located between the top cover 4 of the mixing tank and the base of the lower sealing cylinder 3, and the fixed flange 8 is fixedly connected to the top cover 4 of the mixing tank and the base of the lower sealing cylinder 3, and can be fixedly connected by bolts. The base of the lower sealing cylinder 3 is Figure 1A horizontal plate is fixedly connected to the bottom of the vertical side wall of the middle and lower sealing cylinder 3; a mounting hole is provided at the bottom of the center positioning cylinder 7, through which the stirring shaft 6 can pass; the inner diameter of the center positioning cylinder 7 is 15mm-20mm larger than the diameter of the stirring shaft 6, so that the stirring shaft 6 can easily pass through the middle of the center positioning cylinder 7, reducing the difficulty of assembly, and making the cylinder wall of the center positioning cylinder 7 away from the lateral swing range of the stirring shaft 6 to avoid bumps and scratches; a vibration-damping sealing assembly is provided in the sealing chamber 5, which has the function of sealing and reducing the vibration of the sealing device during stirring, and the vibration-damping sealing assembly includes a shaft chuck 10, which is located above the center positioning cylinder 7, and the shaft chuck 10 is connected to the stirring shaft 6 and rotates in close contact with the stirring shaft 6 The shaft chuck 10 is a pair of open disc clamps, and the shaft chuck 10 is clamped on the stirring shaft 6; a static sealing disc 11 is provided in the sealing chamber 5, and the static sealing disc 11 is stationary. The static sealing disc 11 is located between the lower sealing cylinder 3 and the center positioning cylinder 7, and the inner and outer sides of the static sealing disc 11 are respectively abutted against the center positioning cylinder 7 and the lower sealing cylinder 3, and the bottom surface of the static sealing disc 11 is abutted against the base of the lower sealing cylinder 3; a dynamic sealing disc 12 is provided above the static sealing disc 11, and the dynamic sealing disc 12 is sleeved on the outside of the center positioning cylinder 7 and is rotatably connected to the static sealing disc 11, and the shaft chuck 10 and the dynamic sealing disc 12 are elastically connected by a vibration-damping connecting piece 13. When the stirring shaft 6 rotates, the shaft chuck 10, the vibration-damping connecting piece 13, The dynamic sealing disc 12 rotates synchronously with the stirring shaft 6. The vibration-damping connector 13 is made of fluororubber or polytetrafluoroethylene material, which plays a role in transmitting torque to the dynamic sealing disc 12, and uses its flexible characteristics to offset the lateral and longitudinal vibrations and shakes of the stirring shaft 6 during the operation states such as starting, running, and stopping, so as to ensure that the trajectory of the dynamic sealing disc 12 when rotating around the center positioning cylinder 7 remains unchanged; a closed cavity 16 is formed between the shaft chuck 10, the vibration-damping connector 13, the dynamic sealing disc 12 and the center positioning cylinder 7, and the closed cavity 16 is filled with lubricating oil 17 to prevent the gas in the stirring tank from communicating with the outside world; a plurality of annular sealing grooves 18 arranged at intervals are opened on the inner side wall of the shaft chuck 10, and the annular sealing grooves 18 are provided at intervals. 8 is arranged along the circumference of the stirring shaft 6, and the annular sealing groove 18 is filled with fillers, such as O-shaped rubber rings, raw tape, 1596 silicone sealant, etc., to further enhance the sealing effect between the shaft chuck 10 and the stirring shaft 6; a plurality of grooves distributed at intervals are arranged on the bottom surface of the static sealing disk 11, and a raised nut that can be embedded in the groove on the bottom surface of the static sealing disk 11 is provided on the base of the lower sealing cylinder 3 to cooperate with the locking. When the nut is inserted into the groove on the bottom surface of the static sealing disk 11, the position of the static sealing disk 11 is locked, which in turn restricts the static sealing disk 11 from rotating together with the stirring shaft 6; the static sealing disk 11 is made of fluororubber or polytetrafluoroethylene material to improve its high temperature resistance, self-lubricating wear resistance and corrosion resistance.

[0023] Reference Figure 1A stuffing box 14 is provided between the top cover of the upper sealing cylinder 2 and the stirring shaft 6. An annular convex edge 15 is provided at the bottom of the stuffing box 14. The annular convex edge 15 extends laterally toward the stirring shaft 6. An upper sealing chamber is formed between the stuffing box 14, the annular convex edge 15 and the stirring shaft 6. The upper sealing chamber is filled with a stuffing packing 19. A pressure cover 20 for pressing the stuffing packing 19 is provided at the upper opening of the stuffing box 14. The stuffing box 14 is filled with packing 19. Even if the packing 19 is worn, the air pressure in the stirring tank will push the lubricating oil 17 into the worn position to play a sealing role, thereby meeting the needs of long-term operation of the equipment. The upper sealing cylinder 2 and the lower sealing cylinder 3 can adopt assembled cylinders to facilitate disassembly and installation during later maintenance. For example, the upper sealing cylinder 2 and the lower sealing cylinder 3 are longitudinally symmetrically divided into a first cylinder and a second cylinder. The first cylinder and the second cylinder are sealed and connected by a flange to form a sealed chamber 5. The upper surface of the static sealing disk 11 is a bowl-shaped groove, and the lower surface of the dynamic sealing disk 12 is a bowl-shaped protrusion that matches the static sealing disk 11, so that the dynamic sealing disk 12 can be automatically adjusted to the center during assembly to ensure the concentricity of the dynamic sealing disk 12 and the static sealing disk 11 after assembly. In addition to the bowl shape, the shape of the contact surface of the dynamic sealing disk 12 and the static sealing disk 11 can also be other shapes, such as triangle, rectangle, inverted cone, etc., as long as the concentricity during assembly can be ensured.

[0024] Reference Figure 1 A gap is left between the dynamic sealing disc 12 and the center positioning cylinder 7, a sealing liquid channel is formed between the center positioning cylinder 7, the vibration reduction connector 13, the dynamic sealing disc 12, and the static sealing disc 11, and the closed cavity 16, the sealing liquid channel, and the sealing chamber 5 are connected to form a liquid sealing chamber, and the liquid sealing chamber is filled with lubricating oil 17, which is beneficial to improve the lubrication of each component during relative rotation, reduce friction, reduce friction heat, and improve the sealing effect; an annular groove 21 is also provided on the upper surface of the static sealing disc 11, and an annular protrusion corresponding to the annular groove 21 on the static sealing disc 11 is provided on the lower surface of the dynamic sealing disc 12. The annular protrusion on the dynamic sealing disc 12 is embedded in the annular groove 21 of the static sealing disc 11 to stop each other and limit the rotation trajectory of the dynamic sealing disc 12. The annular groove 21 is filled with lubricating oil 17, which can further improve the sealing effect; a plurality of annular grooves 21 are provided on the static sealing disc 11, and are evenly arranged on the upper surface of the static sealing disc 11, Figure 1 Two annular grooves 21 are provided, which can also be designed to be three or other numbers; a stop ring 22 is provided in the sealing chamber 5, and the stop ring 22 is arranged around the dynamic sealing disk 12. The stop ring 22 provides axial positioning for the dynamic sealing disk 12 to prevent the dynamic sealing disk 12 from suddenly rotating at the moment of starting the stirring shaft 6 and causing upward axial movement, resulting in an increase in the contact gap between the dynamic and static seals and affecting the sealing effect of the dynamic and static disks.

[0025] Reference Figure 1The vibration damping seal assembly also includes a vibration damping buffer, which includes a first pusher claw 23 and a second pusher claw 24. The first pusher claw 23 is fixedly connected to the shaft chuck 10, and the second pusher claw 24 is fixedly connected to the dynamic sealing disk 12. The first pusher claw 23 and the second pusher claw 24 are elastically connected through an elastic member 9. The elastic member 9 can be a spring, a rubber block, or an air spring. The pusher claw is a rigid part used to transmit torque. Its function is to transmit the torsional torque generated when the shaft chuck 10 rotates to the dynamic sealing disk 12 through the vibration damping buffer. , to prevent the torsional moment from causing torsional deformation of the vibration-damping connector 13, and to protect the vibration-damping connector 13 from being torn and damaged by excessive external force; multiple vibration-damping buffers are provided, and are evenly and symmetrically arranged with the stirring shaft 6 as the axis, striving to achieve symmetrical torque balance and uniform force; the first pusher claw 23 and the second pusher claw 24 are elastically connected by an elastic member 9. During assembly, the sealing contact stress between the dynamic sealing disc 12 and the static sealing disc 11 can be adjusted by pre-tightening or loosening the elastic member 9 to ensure the sealing reliability of the dynamic and static sealing mechanism. The roughness of the contact surface between the control center positioning cylinder 7, the base of the lower sealing cylinder 3, the side wall of the sealing chamber 5 and the static sealing disc 11 is 1.8-1.6μm to further improve the sealing effect. An observation window (not shown in the figure) is provided on the side wall of the sealing chamber 5. Specifically, the observation window can be provided on the side wall of the upper sealing cylinder 2, which is convenient for observing the operating status of the sealing device, timely discovering potential faults and sealing leakage, and facilitating the inspection and maintenance of the equipment.

[0026] The following is an example of the pre-ash barrel commonly used in the ammonia-soda process to test the sealing performance of the stirring shaft sealing device provided by the present invention: the pre-ash barrel is a closed reaction barrel with a stirring shaft, and its basic structure and principle are similar to those of a reactor. When the pre-ash barrel is in operation, the reaction materials in the barrel, namely the preheated mother liquor (main component ammonium chloride) and the lime milk (main component calcium hydroxide), are continuously stirred and mixed by the agitator to produce a chemical reaction, and the combined ammonia is converted into free ammonia. The free ammonia is partially vaporized and precipitated in the barrel, and the gaseous ammonia is extremely easy to leak from the gap between the pre-ash barrel cover and the stirring shaft to the outside atmosphere, causing excessive ammonia nitrogen emissions to pollute the atmospheric environment and waste materials; the sealing form of the pre-ash barrel stirring mechanism mostly adopts the traditional mercury sealing mechanism. Mercury as a sealing medium is volatile and is a consumable in actual production applications. It needs to be frequently supplemented according to the consumption, and the maintenance cost is high; and the volatilized mercury vapor is highly toxic, and there is a large safety risk at the production site. According to relevant national laws and regulations, the production, transportation, and use of mercury have been included in the national controlled substances. Therefore, mercury sealing is no longer suitable for continued promotion in the alkali industry.

[0027] The stirring shaft sealing device provided by the present invention is Figure 1Pre-assemble, the shell and stuffing box are not installed. The fixed flange at the bottom of the center positioning cylinder is sealed with a blind plate, and a seamless steel pipe about 0.3m long and φ200mm is made into the style of the stirring shaft, which is clamped on the shaft chuck. The upper end of the steel pipe is blindly blocked with a steel plate, and the steel plate reserves one pressure gauge interface, one compressed air interface, and one safety valve interface. The pressure gauge has a range of -100Kpa-+100KPa vacuum pressure gauge, and an air compressor and a vacuum machine are used to provide gas source pressure and vacuum respectively. The following Tables 1 and 2 are the measured data of the simulation experiment:

[0028]

[0029] The above simulation experimental data fully demonstrates that the sealing pressure of the agitator shaft sealing device of the present invention is between -50KPa and 60KPa, while the normal operating pressure range of the pre-ash bucket is between -30KPa and 15KPa. The sealing performance of the sealing device exceeds the equipment requirements by nearly two times, and fully meets the equipment application. It is completely feasible to replace the traditional mercury sealing device with the sealing device, completely eliminating the use of mercury, greatly reducing production consumption and maintenance costs, and having very large environmental protection, safety, health and social and economic benefits.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A stirring shaft sealing device, comprising a sealing flange (1), wherein an upper sealing cylinder (2) and a lower sealing cylinder (3) are respectively provided above and below the sealing flange (1), wherein the lower sealing cylinder (3) is mounted on a top cover (4) of a stirring tank, wherein the upper sealing cylinder (2) and the lower sealing cylinder (3) are combined to form a sealing chamber (5) through which a stirring shaft (6) can pass; wherein a center positioning cylinder (7) is provided in the sealing chamber (5) and is sleeved on the outside of the stirring shaft (6), wherein the center positioning cylinder (7) is located at the bottom of the sealing chamber (5) and extends upward, wherein a fixing flange (8) is connected to the bottom of the center positioning cylinder (7), wherein the fixing flange (8) is located between the top cover (4) of the stirring tank and a base of the lower sealing cylinder (3), and wherein the fixing flange (8) is fixedly connected to the top cover (4) of the stirring tank and the base of the lower sealing cylinder (3); wherein a mounting hole is provided at the bottom of the center positioning cylinder (7) for the stirring shaft (6) to pass through; wherein: The sealing chamber (5) is also provided with a vibration-damping sealing assembly, and the vibration-damping sealing assembly includes a shaft chuck (10) arranged above the center positioning cylinder (7), and the shaft chuck (10) is connected to the stirring shaft (6) and is rotationally fitted with the stirring shaft (6); the sealing chamber (5) is provided with a static sealing disk (11) arranged between the lower sealing cylinder (3) and the center positioning cylinder (7), and the inner and outer sides of the static sealing disk (11) are respectively in contact with the center positioning cylinder (7) and the lower sealing cylinder (3), and the bottom surface of the static sealing disk (11) is in contact with the base of the lower sealing cylinder (3); the upper side of the static sealing disk (11) A dynamic sealing disc (12) is provided, the dynamic sealing disc (12) is sleeved outside the center positioning cylinder (7) and is rotatably connected to the static sealing disc (11), and the shaft chuck (10) and the dynamic sealing disc (12) are elastically connected via a vibration-damping connecting piece (13); when the stirring shaft (6) rotates, the shaft chuck (10), the vibration-damping connecting piece (13) and the dynamic sealing disc (12) rotate synchronously with the stirring shaft (6); a closed cavity (16) is formed between the shaft chuck (10), the vibration-damping connecting piece (13), the dynamic sealing disc (12) and the center positioning cylinder (7), and the closed cavity (16) is filled with lubricating oil (17).

2. The stirring shaft sealing device according to claim 1, characterized in that: The inner diameter of the center positioning cylinder (7) is 15 mm to 20 mm larger than the diameter of the stirring shaft (6).

3. The stirring shaft sealing device according to claim 1, characterized in that: A plurality of annular sealing grooves (18) are provided on the inner side wall of the shaft chuck (10) and are arranged at intervals along the circumference of the stirring shaft (6), and the annular sealing grooves (18) are filled with fillers.

4. The stirring shaft sealing device according to claim 1, characterized in that: The bottom surface of the static sealing disk (11) is provided with a plurality of grooves distributed at intervals, and the base of the lower sealing cylinder (3) is provided with a raised nut capable of being embedded in the grooves of the bottom surface of the static sealing disk (11) for locking.

5. The stirring shaft sealing device according to claim 1, characterized in that: A stuffing box (14) is provided between the top cover of the upper sealing cylinder (2) and the stirring shaft (6); an annular flange (15) extending laterally toward the stirring shaft (6) is provided at the bottom of the stuffing box (14); an upper sealing cavity is formed between the stuffing box (14), the annular flange (15) and the stirring shaft (6); a stuffing packing (19) is filled in the upper sealing cavity; and a pressure cover (20) for pressing the stuffing packing (19) is provided at the upper opening of the stuffing box (14).

6. The stirring shaft sealing device according to claim 1, characterized in that: A gap is left between the dynamic sealing disc (12) and the center positioning cylinder (7); a sealing liquid channel is formed between the center positioning cylinder (7), the vibration-damping connecting piece (13), the dynamic sealing disc (12), and the static sealing disc (11); the closed cavity (16), the sealing liquid channel, and the sealing chamber (5) are connected to form a liquid sealing cavity; the liquid sealing cavity is filled with lubricating oil (17).

7. The stirring shaft sealing device according to claim 6, characterized in that: The upper surface of the static sealing disk (11) is also provided with an annular groove (21), and the lower surface of the dynamic sealing disk (12) is provided with an annular protrusion corresponding to the annular groove (21) on the static sealing disk (11), the annular protrusion on the dynamic sealing disk (12) is embedded in the annular groove (21) of the static sealing disk (11) to block each other, and the annular groove (21) is filled with lubricating oil (17).

8. The stirring shaft sealing device according to claim 1, characterized in that: A stop ring (22) is arranged around the dynamic sealing disc (12) in the sealing chamber (5), and the stop ring (22) provides axial positioning for the dynamic sealing disc (12).

9. The stirring shaft sealing device according to claim 1, characterized in that: The vibration-damping seal assembly also includes a vibration-damping buffer, which includes a first pusher claw (23) and a second pusher claw (24), the first pusher claw (23) being fixedly connected to the shaft chuck (10), the second pusher claw (24) being fixedly connected to the dynamic sealing disk (12), and the first pusher claw (23) and the second pusher claw (24) being elastically connected via an elastic member (9).

10. The stirring shaft sealing device according to claim 1, characterized in that: An observation window is provided on the side wall of the sealed chamber (5).

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