Sealing device

Abstract

The utility model discloses a sealing device which is used for sealing between a stirrer and a rotating shaft. The sealing device comprises a rotor structure, a stator structure and a magnetic structure, the rotor structure is used for being fixedly arranged on the rotating shaft in a sleeving mode, and the rotor structure and the rotating shaft are sealed through a sealing piece. Protrusions are arranged on the side wall of the mover structure in the circumferential direction and deviate from the axis. The stator structure is arranged on the rotor structure in a sleeved mode, and part of the stator structure is arranged opposite to the protrusion in the axial direction. The magnetic structure is located between the stator structure and the protrusion and is connected with the stator structure. By adopting the sealing device provided by the utility model, the sealing between the rotor structure and the rotating shaft and the sealing between the stator structure and the upper cover can be realized, and meanwhile, the gap is formed between the magnetic structure and the bulge along the axial direction, and a stable magnetic field is formed in the gap, so that the magnetic fluid is restrained in the magnetic field; the axial thickness of the mover structure is effectively reduced while sealing between the stator structure and the mover structure is achieved.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a sealing device. Background Technology

[0002] In recent years, with the rapid development of the lithium battery industry, the demand for lithium batteries has been continuously increasing. Currently, in the lithium battery production process, raw materials need to be stirred by a rotating shaft in a reactor to complete a series of chemical reactions and obtain the positive electrode material for lithium batteries. However, due to the gap between the stirrer and the rotating shaft in the reactor, gas leakage can occur. To solve this problem, a mechanical seal structure can be installed between the stirrer and the rotating shaft to seal the gap between them. However, along the axial direction of the rotating shaft, the existing mechanical seal structure is relatively thick. Thus, when the installation space on site is limited, the above sealing method cannot effectively seal the gap between the stirrer and the rotating shaft.

[0003] Therefore, how to reduce the volume of mechanical seal structures while ensuring sealing performance has become a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] This invention provides a sealing device that reduces the size of the sealing device while ensuring a sealing effect.

[0005] This invention provides a sealing device for sealing between a stirrer and a rotating shaft. The stirrer includes a top cover, and a portion of the rotating shaft passes through the top cover and extends into the stirrer. The sealing device includes a moving element structure, a stator structure, and a magnetic structure. The moving element structure is sleeved on and fixedly connected to the rotating shaft. A first sealing element is provided on the side wall of the moving element structure near the axis, and the first sealing element abuts against the rotating shaft. A protrusion is provided circumferentially on the side wall of the moving element structure, and the protrusion is away from the axis. The stator structure is sleeved on the moving element structure, and a portion of the stator structure is positioned opposite the protrusion along the axial direction of the moving element structure. The magnetic structure is located between the portion of the stator structure and the protrusion, and is connected to the stator structure. A first gap exists between the magnetic structure and the protrusion along the axial direction of the moving element structure, and the first gap is filled with a magnetic fluid. The stator structure is connected to the top cover. A second sealing element is provided on the side of the stator structure near the top cover, and the second sealing element abuts against the top cover.

[0006] The sealing device provided by this utility model can achieve sealing between the moving structure and the rotating shaft, and between the stator structure and the top cover. At the same time, along the axial direction of the moving structure, the magnetic structure connected to the stator structure is arranged opposite to the protrusion on the side wall of the moving structure, and a first gap is set between the magnetic structure and the protrusion along the axial direction. A stable magnetic field is formed in the first gap, thereby confining the magnetic fluid within the magnetic field. This effectively reduces the thickness of the moving structure along the axial direction while achieving sealing between the stator structure and the moving structure, thus reducing the volume of the sealing device.

[0007] In one possible implementation of this invention, the stator structure includes a first groove surrounding the mover structure, with the opening of the first groove facing the protrusion. A portion of the magnetic structure is embedded in the first groove. Along the axial direction of the stator structure, this design helps reduce the space occupied by the magnetic structure outside the stator structure, thereby reducing the thickness of the sealing device. Furthermore, by mounting the magnetic structure in the first groove, the ease of installation of the magnetic structure is also improved.

[0008] In one possible implementation of this invention, the magnetic structure includes a first pole piece and a permanent magnet. The first pole piece is located in a first groove and surrounds the mover structure. The permanent magnet is connected to the sidewall of the first pole piece facing or away from the axis. Along the axial direction of the first pole piece, a first gap exists between the first pole piece and the protrusion. By using the sealing device provided by this invention, and by setting a connecting permanent magnet and pole piece, the simplicity of the magnetic structure is improved while meeting the magnetic field requirements.

[0009] In one possible implementation of this invention, the magnetic structure further includes a second pole shoe, which is sleeved on top of the first pole shoe, with a permanent magnet located between the first and second pole shoes. A first gap exists between the second pole shoe and the protrusion along the axial direction of the second pole shoe. This allows a stable magnetic field to be formed between the second pole shoe and the protrusion of the mover structure, so that when the seal of the magnetic fluid between the first pole shoe and the protrusion fails, the seal between the mover structure and the stator structure can be achieved through the magnetic fluid between the second pole shoe and the protrusion.

[0010] In one possible implementation of this invention, the sealing device further includes a positioning structure located between the first pole shoe and the second pole shoe, and abutting against the sidewalls of the first and second pole shoes respectively. This is to improve the stability of the spacing between the pole shoes during the installation of the sealing device.

[0011] In one possible implementation of this invention, the sealing device further includes an adjustment structure located between the stator structure and the protrusion along the axial direction of the moving part structure. The stator structure is rotatably connected to the moving part structure via the adjustment structure. Using the sealing device provided by this invention, users can adjust the size of the first gap by replacing the adjustment structure with different specifications, thereby improving the magnetic field stability between the magnetic structure and the protrusion, and effectively enhancing the sealing effectiveness of the magnetic fluid filling the first gap.

[0012] In one possible implementation of this invention, the moving part structure includes a second groove located between the first groove and the rotating shaft, and used to surround the rotating shaft. The adjustment structure portion is located in the second groove. This effectively improves the ease of installation of the adjustment structure.

[0013] In one possible implementation of this utility model, the stator structure includes a first mounting part and a second mounting part. The first mounting part is sleeved on the side wall of the mover structure and is disposed opposite to the protrusion. A magnetic structure is disposed between the first mounting part and the protrusion. Along the axial direction of the mover structure, the second mounting part is disposed opposite to the first mounting part and is detachably connected. A third sealing element is provided at the connection position between the second mounting part and the first mounting part. A fixing part is provided circumferentially on the side wall of the second mounting part, and the protrusion is located between the first mounting part and the fixing part. The fixing part is used for fixed connection with the upper cover. Thus, during the installation of the sealing device, the second mounting part can be placed on the upper cover first, and then the fixing part of the second mounting part can be fixedly connected to the upper cover. After that, the mover structure and the stator structure with the magnetic structure are installed one by one, thereby improving the ease of installation of the sealing device.

[0014] In one possible implementation of this invention, the sealing device further includes a mounting base and a bellows. A second gap exists between the mounting base and the stator structure along the axial direction of the stator structure. The mounting base is used to connect to the upper cover. The bellows is used to be sleeved on the rotating shaft and is located within the second gap. The bellows is connected to the stator structure and the mounting base.

[0015] Because relative wobbling occurs between the shaft and the agitator during operation, by fitting a corrugated pipe around the shaft and connecting it between the mounting base and the stator structure, the shaft can cause the rotor and stator structures to wobble synchronously, thereby effectively reducing the risk of the shaft colliding with the stator structure.

[0016] In one possible implementation of this invention, the sealing device further includes a connecting structure, which is sleeved on and fixedly connected to the rotating shaft. The connecting structure engages with the moving structure along the rotation direction of the moving part. This improves the structural simplicity of the sealing device while ensuring that the rotating shaft drives the connecting structure and the moving part to rotate synchronously. Attached Figure Description

[0017] Figure 1 A schematic diagram of the sealing device provided by this utility model;

[0018] Figure 2 for Figure 1 A partial enlarged view of point A of the provided sealing device;

[0019] Figure 3 Another structural schematic diagram of the sealing device provided by this utility model;

[0020] Figure 4 for Figure 1 A schematic diagram of one possible structure of the provided sealing device;

[0021] Figure 5 This is a schematic diagram of another structure of the sealing device provided by this utility model.

[0022] Reference numerals: 01-Top cover; 02-Rotating shaft; 1-Stator structure; 11-Second seal; 12-First groove; 13-First mounting part; 131-Third seal; 14-Second mounting part; 15-Fourth seal; 16-Fifth seal; 141-Fixing part; 2-Motor structure; 21-First seal; 22-Protrusion; 23-Second groove; 3-Magnetic structure; 31-Magnetic fluid; 32-First pole shoe; 33-Permanent magnet; 34-Second pole shoe; 4-Adjustment structure; 41-Bearing; 42-Adjustment washer; 5-Positioning structure; 6-Mounting base; 7-Bellwall; 8-Connecting structure; 9-Expansion sleeve. Detailed Implementation

[0023] 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 accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this utility model are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the protection scope of this utility model. The accompanying drawings of the embodiments of this utility model are only for illustrating relative positional relationships and do not represent actual proportions.

[0024] It should be noted that specific details are set forth in the following description to facilitate understanding of this invention. However, this invention can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this invention. Therefore, this invention is not limited to the specific embodiments disclosed below.

[0025] In recent years, with the rapid development of the lithium battery industry, the demand for lithium batteries has been continuously increasing. Currently, in the lithium battery production process, raw materials need to be stirred by a rotating shaft in a reactor to complete a series of chemical reactions and obtain the positive electrode material for lithium batteries. However, due to the gap between the stirrer and the rotating shaft in the reactor, gas leakage can occur. To solve this problem, a mechanical seal structure can be installed between the stirrer and the rotating shaft to seal the gap between them. However, along the axial direction of the rotating shaft, the existing mechanical seal structure is relatively thick. Thus, when the installation space on site is limited, the above sealing method cannot effectively seal the gap between the stirrer and the rotating shaft.

[0026] In view of this, in the sealing device provided by this utility model, along the axial direction of the rotating shaft, the magnetic structure and the moving part structure are spaced apart, and the gap between them is filled with magnetic fluid, so as to achieve sealing of the gap between the rotating shaft and the agitator while effectively reducing the volume of the sealing device. To make the objectives, technical solutions, and advantages of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] refer to Figure 1 , Figure 1 This is a schematic diagram of a sealing device provided by this utility model. The sealing device is used to seal between the stirrer and the rotating shaft 02. The stirrer includes an upper cover 01, and a portion of the rotating shaft 02 passes through the upper cover 01 and extends into the interior of the stirrer. The sealing device includes a stator structure 1, a mover structure 2, and a magnetic structure 3. The stator structure 1 is used to connect with the upper cover 01, and a second sealing element 11 is provided on the side of the stator structure 1 closest to the upper cover 01. The second sealing element 11 abuts against the upper cover 01 to achieve a seal between the stator structure 1 and the upper cover 01.

[0028] The moving part structure 2 is sleeved on and fixedly connected to the rotating shaft 02 so that it drives the moving part structure 2 to rotate synchronously during the process of the rotating shaft 02 stirring the raw materials in the agitator. At the same time, a first sealing element 21 is provided on the side wall of the moving part structure 2 near the axis, and the first sealing element 21 is used to abut against the rotating shaft 02. This can reduce the risk of gas in the agitator leaking into the external environment through the gap between the two.

[0029] Furthermore, the sidewall of the mover structure 2 is provided with a protrusion 22 along the circumferential direction. Simultaneously, the stator structure 1 is fitted onto the mover structure 2, and along the axial direction of the mover structure 2, a portion of the stator structure 1 is positioned opposite the protrusion 22. The magnetic structure 3 is located between the portion of the stator structure 1 and the protrusion 22, and is connected to the stator structure 1. Simultaneously, along the axial direction of the mover structure 2, a first gap exists between the magnetic structure 3 and the protrusion 22, and this first gap is filled with magnetic fluid 31. Since a stable magnetic field can be formed between the magnetic structure 3 and the mover structure 2, the magnetic fluid 31 can effectively seal the space between the magnetic structure 3 and the mover structure 2 under the constraint of the stable magnetic field.

[0030] It should be noted that this utility model does not limit the specific form of the magnetic fluid 31. For example, the magnetic fluid 31 can be a water-based magnetic fluid, as its base fluid is water, which helps reduce the risk of environmental pollution. Alternatively, the magnetic fluid 31 can also be an oil-based magnetic fluid. The base fluid of oil-based magnetic fluids is generally a weakly polar organic medium, such as toluene or silicone oil, which helps improve the stability of the magnetic fluid 31. Users can choose different magnetic fluids 31 according to their actual needs. For example, when the reaction system of the magnetic fluid 31 is an aqueous medium or the reaction temperature is below the boiling point of water, the user can choose a water-based magnetic fluid. Conversely, when the reaction system of the magnetic fluid 31 is an oil-based medium or the reaction temperature is above the boiling point of water, the user can choose an oil-based magnetic fluid.

[0031] Understandably, since the moving structure 2 and the stator structure 1 are sealed by the magnetic fluid 31, dry friction between the moving structure 2 and the stator structure 1 can be avoided, thereby effectively reducing the risk of friction debris entering the agitator due to dry friction between the moving structure 2 and the stator structure 1.

[0032] In addition, the stator structure 1, the mover structure 2 and the magnetic structure 3 are coaxially arranged, which can improve the ease of assembly and consistency of the sealing device.

[0033] The sealing device provided by this utility model can achieve sealing between the moving structure 2 and the rotating shaft 02, and between the stator structure 1 and the upper cover 01. At the same time, along the axial direction of the moving structure 2, the magnetic structure 3 connected to the stator structure 1 is arranged opposite to the protrusion 22 on the side wall of the moving structure 2, and a first gap is set between the magnetic structure 3 and the protrusion 22 along the axial direction, and a stable magnetic field is formed in the first gap. This confines the magnetic fluid 31 within the magnetic field, thereby achieving sealing between the stator structure 1 and the moving structure 2 while effectively reducing the thickness of the moving structure 2 along the axial direction, thus reducing the volume of the sealing device.

[0034] It should be noted that the first seal 21 and the second seal 11 can be, for example, O-rings. This can effectively reduce production costs while achieving a sealed connection between the mover structure 2 and the rotating shaft 02, and a sealed connection between the stator structure 1 and the upper cover 01.

[0035] In a specific embodiment, such as Figure 1 As shown, the stator structure 1 includes a first groove 12, which surrounds the mover structure 2 (i.e., the first groove 12 is annular), and the opening of the first groove 12 faces the protrusion 22 of the mover structure 2. A portion of the magnetic structure 3 can be embedded in the first groove 12. This reduces the space occupied by the magnetic structure 3 outside the stator structure 1 along its axial direction, thus helping to reduce the thickness of the sealing device. Furthermore, by installing the magnetic structure 3 in the first groove 12, the ease of installation of the magnetic structure 3 is also improved.

[0036] In one alternative implementation, continue to refer to Figure 1 The stator structure 1 may further include a first mounting portion 13 and a second mounting portion 14. Specifically, the first mounting portion 13 is sleeved on the side wall of the mover structure 2 and is coaxial with the mover structure 2. In addition, the first mounting portion 13 is disposed opposite to the protrusion 22, and the magnetic structure 3 is disposed between the first mounting portion 13 and the protrusion 22.

[0037] It is understood that, along the axial direction of the moving part structure 2, the first mounting part 13 is disposed opposite to the protrusion 22, and the first groove 12 can be disposed on the first mounting part 13 (i.e., the first mounting part 13 is annular).

[0038] Furthermore, along the axial direction of the moving part structure 2, the second mounting part 14 is disposed opposite to the first mounting part 13 and is detachably connected. At the same time, a third sealing member 131 is provided at the connection position between the second mounting part 14 and the first mounting part 13 to achieve a sealed connection between the first mounting part 13 and the second mounting part 14.

[0039] It should be noted that the structure of the third seal 131 can be referenced from the structure of the first seal 21, and will not be described again here.

[0040] A fixing part 141 can be provided circumferentially on the side wall of the second mounting part 14. The protrusion 22 of the moving part structure 2 is located between the first mounting part 13 and the fixing part 141. The fixing part 141 is used to fix it to the upper cover 01. In this way, during the installation of the sealing device, the second mounting part 14 can be placed on the upper cover 01 first, and then the fixing part 141 of the second mounting part 14 can be fixedly connected to the upper cover 01. After that, the moving part structure 2 and the stator structure 1 with the magnetic structure 3 can be installed one by one to improve the ease of installation of the sealing device.

[0041] It should be noted that this utility model does not limit the fixing method between the fixing part 141 and the upper cover 01. For example, the two can be fixed by bolts to improve the ease of installation between the fixing part 141 and the upper cover 01. The second sealing member 11 of the second mounting part 14 is located between the fixing part 141 and the upper cover 01 and is sleeved on the moving part structure 2. At the same time, the bolt is located in the inner ring of the second sealing member 11, and the second sealing member 11 abuts against the fixing part 141 and the upper cover 01 respectively to achieve a seal between the fixing part 141 and the upper cover 01.

[0042] In addition, the fixing part 141 can be, for example, a circumferential bend of the second mounting part 14 or a circumferential protrusion 22, so as to improve the processing convenience of the second mounting part 14 while meeting the requirement of fixed connection with the upper cover 01.

[0043] In one specific embodiment, reference Figure 2 , Figure 2 for Figure 1 The provided enlarged view of part A of the sealing device is used to show the partial structure of the sealing device. The sealing device may also include an adjustment structure 4, which is located between the stator structure 1 and the protrusion 22 along the axial direction of the moving part structure 2, and abuts against the stator structure 1 and the moving part structure 2 respectively. The stator structure 1 is rotatably connected to the moving part structure 2 through the adjustment structure 4.

[0044] By using the sealing device provided by this utility model, the user can adjust the size of the first gap between the magnetic structure 3 installed on the stator structure 1 and the protrusion 22 of the mover structure 2 by replacing the adjustment structure 4 of different specifications, so as to improve the magnetic field stability between the magnetic structure 3 and the protrusion 22, thereby effectively improving the sealing effectiveness of the magnetic fluid 31 filling the first gap.

[0045] In addition, the moving part structure 2 includes a second groove 23, which is located between the first groove 12 of the stator structure 1 and the rotating shaft 02, and is used to surround the rotating shaft 02 (i.e., the second groove 23 is in the shape of a ring). At the same time, part of the adjustment structure 4 is located in the second groove 23, which can effectively improve the ease of installation of the adjustment structure 4.

[0046] In an optional embodiment, the adjusting structure 4 includes a bearing 41, which is sleeved on the moving part structure 2 and along the axial direction of the moving part structure 2. One side wall of the bearing 41 abuts against the bottom of the second groove 23, and the other side wall is connected to the stator structure 1 to achieve a rotatable connection between the moving part structure 2 and the stator structure 1. Furthermore, the user can change the size of the first clearance by replacing bearings 41 of different specifications. Alternatively, the bearing 41 can be, for example, a planar thrust needle roller bearing 41.

[0047] It is worth mentioning that the adjustment structure 4 may also include an adjustment washer 42. The adjustment washer 42 is sleeved on the moving part structure 2 and is located between the bearing 41 and the stator structure 1 along the axial direction of the moving part structure 2, and abuts against the bearing 41 and the stator structure 1 respectively. In this way, when it is necessary to adjust the first gap, the user only needs to replace the adjustment washer 42 of different thicknesses to achieve a quick adjustment of the first gap, thereby effectively improving the adjustment convenience of the sealing device.

[0048] In a specific embodiment, such as Figure 2 As shown, the magnetic structure 3 includes a first pole piece 32 and a permanent magnet 33. The first pole piece 32 is located within the first groove 12 of the second mounting portion 14 and surrounds the moving part structure 2 (i.e., the first pole piece 32 is annular and coaxially arranged with the moving part structure 2). The permanent magnet 33 is connected to the sidewall of the first pole piece 32 facing or away from the axis, so that the first pole piece 32 is magnetic, thereby forming a stable magnetic field between the first pole piece 32 and the protrusion 22 of the moving part structure 2. In addition, along the axial direction of the first pole piece 32, there is a first gap between the first pole piece 32 and the protrusion 22 of the moving part structure 2. By using the sealing device provided by this utility model, the connected permanent magnet and pole piece can improve the simplicity of the magnetic structure 3 while meeting the magnetic field requirements.

[0049] It should be noted that the permanent magnet 33 can be ring-shaped to improve the ease of installation. Alternatively, the permanent magnet 33 can also be a rectangular block. When the permanent magnet 33 is a rectangular block, the sealing device needs to include multiple permanent magnets 33 to improve magnetic stability. Furthermore, the multiple permanent magnets 33 can be evenly distributed along the circumference of the pole piece to further enhance the stability of the magnetic field.

[0050] Understandably, the mover structure 2 can be made of a metal with magnetic permeability to further enhance the stability of the magnetic field between the first pole shoe 32 and the protrusion 22 of the mover structure 2.

[0051] It should be noted that this utility model does not limit the connection method between the first pole shoe 32 and the first groove 12. For example, the first pole shoe 32 can be welded into the first groove 12 to improve the integrity of the first pole shoe 32 and the stator structure 1. The first pole shoe 32 can also be fixed to the bottom of the first groove 12 by bolts to improve the ease of disassembly of the first pole shoe 32 and the stator structure 1.

[0052] In an optional embodiment, the stator structure 1 may further include a fourth seal 15 and a fifth seal 16. When the first pole shoe 32 is fixed to the bottom of the first groove 12 by bolts, the first pole shoe 32 is located between the fourth seal 15 and the fifth seal 16, which can effectively reduce the risk of gas leakage in the agitator along the mounting holes of the bolts.

[0053] In addition, the structures of the fourth seal 15 and the fifth seal 16 can refer to the structures of the first seal 21 and the second seal 11, and will not be described again here.

[0054] It is worth mentioning that the magnetic structure 3 may also include a second pole shoe 34, which is sleeved on the first pole shoe 32 and located between the fourth seal 15 and the fifth seal 16. The permanent magnet 33 is located between the first pole shoe 32 and the second pole shoe 34, so that both the first pole shoe 32 and the second pole shoe 34 are magnetic. At the same time, along the axial direction of the second pole shoe 34, there is a first gap between the second pole shoe 34 and the protrusion 22. This allows a stable magnetic field to be formed between the second pole shoe 34 and the protrusion 22 of the mover structure 2. When the seal of the magnetic fluid 31 between the first pole shoe 32 and the protrusion 22 fails, the seal between the mover structure 2 and the stator structure 1 can be achieved through the magnetic fluid 31 between the second pole shoe 34 and the protrusion 22.

[0055] It is understood that the sealing device provided by this utility model can be provided with multiple pole shoes along the radial direction of the moving part structure 2 in order to further improve the sealing reliability between the moving part structure 2 and the stator structure 1.

[0056] It is worth mentioning that, such as Figure 2 As shown, the sealing device may further include a positioning structure 5, which is located between the first pole shoe 32 and the second pole shoe 34, and abuts against the side wall of the first pole shoe 32 and the side wall of the second pole shoe 34, respectively, to improve the stability of the spacing between the pole shoes during the installation of the sealing device.

[0057] The positioning structure 5 can be an example of a ring shape to improve the ease of connection between the positioning structure 5 and each pole piece.

[0058] In one specific embodiment, reference Figure 3 , Figure 3 This is another structural schematic diagram of the sealing device provided by this utility model. Specifically, the sealing device also includes a mounting base 6 and a bellows 7. The mounting base 6 is used to connect with the upper cover 01. Along the axial direction of the stator structure 1, there is a second gap between the mounting base 6 and the stator structure 1. The bellows 7 is located in the second gap and is used to be sleeved on the rotating shaft 02. At the same time, the bellows 7 is connected to the stator structure 1 and the mounting base 6.

[0059] In this way, when relative shaking occurs between the rotating shaft 02 and the agitator, by fitting the bellows 7 onto the rotating shaft 02 and connecting it between the mounting base 6 and the stator structure 1, the rotating shaft 02 can drive the actuator structure 2 and the stator structure 1 to shake synchronously, thereby effectively reducing the risk of the rotating shaft 02 colliding with the stator structure 1.

[0060] In a specific embodiment, such as Figure 4 As shown, Figure 4 for Figure 1 A schematic diagram of one structure of the provided sealing device. The sealing device also includes a connecting structure 8, which is combined with... Figure 1 and Figure 4 The connecting structure 8 is used to be sleeved on the rotating shaft 02 and fixedly connected to the rotating shaft 02. The connecting structure 8 can be ring-shaped, and the connecting structure 8 and the rotating shaft 02 can be connected by bolts to improve the ease of connection between the connecting structure 8 and the rotating shaft 02.

[0061] In addition, along the rotation direction of the moving part structure 2, the connecting structure 8 is engaged with the moving part structure 2 so as to enable the rotating shaft 02 to drive the connecting structure 8 and the moving part structure 2 to rotate synchronously.

[0062] In one alternative implementation, such as Figure 5 As shown, Figure 5 The sealing device also includes an expansion sleeve 9, which is fitted onto the adapter structure 8. The user can continuously tighten the expansion sleeve 9 with bolts so that the expansion sleeve 9 continuously squeezes the adapter structure 8, thereby achieving a fixed connection between the adapter structure 8 and the adapter shaft 02.

[0063] It is worth mentioning that the connecting structure 8 can be an annular shape with an opening on the side wall. In this way, as the expansion sleeve 9 tightens continuously, the connecting structure 8 can also tighten towards the rotating shaft 02, which helps to further improve the connection stability between the connecting structure 8 and the rotating shaft 02.

[0064] It should be noted that this utility model does not limit the snap-fit ​​method between the connecting structure 8 and the moving structure 2. For example, along the axial direction of the moving structure 2, the side wall of the connecting structure 8 is provided with a boss, and the side wall of the moving structure 2 is provided with a groove, and the boss is inserted into the groove, so as to realize the snap-fit ​​between the connecting structure 8 and the moving structure 2 along the rotation direction of the moving structure 2, while improving the simplicity of the sealing device.

[0065] In summary, the sealing device provided by this utility model can achieve sealing between the moving structure 2 and the rotating shaft 02, and between the stator structure 1 and the upper cover 01. At the same time, along the axial direction of the moving structure 2, the magnetic structure 3 connected to the stator structure 1 is arranged opposite to the protrusion 22 on the side wall of the moving structure 2, and a first gap is set between the magnetic structure 3 and the protrusion 22 along the axial direction, and a stable magnetic field is formed in the first gap. This confines the magnetic fluid 31 within the magnetic field, thereby achieving sealing between the stator structure 1 and the moving structure 2 while effectively reducing the thickness of the moving structure 2 along the axial direction, thus reducing the volume of the sealing device.

[0066] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A sealing device for sealing between a stirrer and a rotating shaft, the stirrer including a top cover, a portion of the rotating shaft passing through the top cover and extending into the interior of the stirrer, characterized in that, The sealing device includes a moving part structure, a stator structure, and a magnetic structure, wherein: The moving part structure is used to be sleeved on the rotating shaft and fixedly connected to the rotating shaft; a first sealing element is provided on the side wall of the moving part structure near the axis, and the first sealing element is used to abut against the rotating shaft; The sidewall of the moving part structure is provided with a protrusion along the circumferential direction, and the protrusion is away from the axis; the stator structure is sleeved on the moving part structure, and along the axial direction of the moving part structure, a part of the stator structure is arranged opposite to the protrusion; The magnetic structure is located between a portion of the stator structure and the protrusion, and is connected to the stator structure; along the axial direction of the mover structure, there is a first gap between the magnetic structure and the protrusion, and the first gap is filled with magnetic fluid; The stator structure is used to connect with the upper cover; and a second sealing element is provided on the side of the stator structure near the upper cover, the second sealing element being used to abut against the upper cover.

2. The sealing device according to claim 1, characterized in that, The stator structure includes a first groove surrounding the mover structure, with the opening of the first groove facing the protrusion, and a portion of the magnetic structure is embedded in the first groove.

3. The sealing device according to claim 2, characterized in that, The magnetic structure includes a first pole shoe and a permanent magnet. The first pole shoe is located in the first groove and surrounds the moving part structure. The permanent magnet is connected to the side wall of the first pole shoe facing or away from the axis. Along the axial direction of the first pole shoe, there exists the first gap between the first pole shoe and the protrusion.

4. The sealing device according to claim 3, characterized in that, The magnetic structure further includes a second pole shoe, which is sleeved on the first pole shoe, and the permanent magnet is located between the first pole shoe and the second pole shoe. Along the axial direction of the second pole shoe, there exists the first gap between the second pole shoe and the protrusion.

5. The sealing device according to claim 4, characterized in that, The sealing device further includes a positioning structure located between the first pole shoe and the second pole shoe, and abutting against the sidewalls of the first pole shoe and the second pole shoe, respectively.

6. The sealing device according to any one of claims 2-5, characterized in that, The sealing device further includes an adjustment structure located between the stator structure and the protrusion along the axial direction of the moving part structure; the stator structure is rotatably connected to the moving part structure through the adjustment structure.

7. The sealing device according to claim 6, characterized in that, The moving part structure includes a second groove located between the first groove and the rotating shaft, and is used to surround the rotating shaft, with a portion of the adjustment structure located in the second groove.

8. The sealing device according to claim 1, characterized in that, The stator structure includes a first mounting part and a second mounting part. The first mounting part is sleeved on the side wall of the mover structure and is disposed opposite to the protrusion. The magnetic structure is disposed between the first mounting part and the protrusion. Along the axial direction of the moving part structure, the second mounting part is disposed opposite to the first mounting part and is detachably connected; a third sealing element is provided at the connection position between the second mounting part and the first mounting part; A fixing part is provided on the side wall of the second mounting part in the circumferential direction, and the protrusion is located between the first mounting part and the fixing part; the fixing part is used to fix it to the upper cover.

9. The sealing device according to claim 1, characterized in that, The sealing device further includes a mounting base and a bellows, and a second gap exists between the mounting base and the stator structure along the axial direction of the stator structure; and the mounting base is used to connect with the upper cover; The bellows is used to be sleeved on the rotating shaft and is located in the second gap; the bellows is connected to the stator structure and the mounting base.

10. The sealing device according to claim 1, characterized in that, The sealing device further includes a connecting structure, which is used to be sleeved on the rotating shaft and fixedly connected to the rotating shaft; Along the rotation direction of the moving part structure, the connecting structure is engaged with the moving part structure.

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