Stirring device

Abstract

The invention relates to the technical field of stirring equipment, in particular to a stirring device which comprises a stirring tank and a bearing pack arranged in the stirring tank, and the bearing pack comprises a second bearing assembly installed at the bottom of an inner cavity of the stirring tank. The second bearing assembly comprises a bearing seat, a bearing arranged in the bearing seat and a bearing inner cover mounted on the bearing seat, the bearing is sealed in the bearing inner cover, a stirring shaft is fixed on an inner ring of the bearing, a rotating sleeve is mounted on the inner ring, the bearing inner cover is mounted on the rotating sleeve, and the stirring shaft is fixed on the rotating sleeve. An oil channel is formed between the stirring shaft and the rotating sleeve, the oil channel is communicated with the inner ring and enables the inner ring to be automatically lubricated when the bearings are in a closed state, a fixing support is arranged on the middle bearing, and the other end of the fixing support is arranged on the cavity wall of the stirring tank. On the premise that the performance of the second bearing assembly is improved, the stability of the stirring shaft can be further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of stirring equipment, and particularly to a stirring device. Background Art

[0002] In the field of chemical stirring, the stirring mechanism has relatively high requirements for chemical media. First, its corrosion resistance is considered. The stirring mechanism consists of a stirrer and a bearing used to install the stirrer in a stirring tank. In order to improve the stability of the stirrer and enable the bearing to withstand the lateral force of the stirrer, a Chinese patent with the application number 202280065935.0 discloses a stirring device. The stirring device has at least one intermediate bearing, which is designed to support a stirring shaft in a stirring container, and the intermediate bearing has a first bearing element and a second bearing element. When the stirrer rotates, the second bearing element rotates around a bearing axis relative to the first bearing element and contacts the first bearing element, enabling the bearing to achieve double-layer rolling contact, that is, lubrication is completed through the contact of a lubricating film of a lubricant under static or dynamic pressure lubrication conditions.

[0003] Although this intermediate bearing can withstand a high temperature of 250 degrees through a double-bearing cooperation relationship and is in a chemical preparation for a long time, its corrosion resistance is relatively low. Moreover, due to the double-bearing cooperation relationship of the intermediate bearing, there are multiple transmission parts, and it is not easy to lubricate from the inside of the bearing. Summary of the Invention

[0004] To solve the above problems, the present invention provides a stirring device, including a stirring tank and a bearing group arranged in the stirring tank. The bearing group includes a second bearing assembly installed at the bottom of the inner cavity of the stirring tank. The second bearing assembly includes a bearing seat, a bearing arranged in the bearing seat, and a bearing inner cover installed on the bearing seat. The bearing is enclosed in the bearing inner cover. A stirring shaft is fixed on the inner ring of the bearing, a rotating sleeve is installed on the inner ring, an oil passage is formed between the stirring shaft and the rotating sleeve, the oil passage communicates with the inner ring and automatically lubricates the inner ring in a sealed state of the bearing. A driving seat is arranged on the bearing seat, and the driving seat is located on the rotation path of the oil passage following the rotating sleeve, used to throw lubricating oil onto the driving seat, and the driving seat throws the lubricating oil onto the bearing inner cover.

[0005] As a further preference, the oil passage is opened from the top end to the bottom end of the stirring shaft. A secondary oil passage communicating with the outer circumferential surface of the rotating sleeve is provided at the bottom end of the oil passage. The secondary oil passage inclines above the inner ring. The bearing inner cover is an inverted conical cover. An upper opening is provided at the small top end thereof, and a lower opening is provided at the large bottom end thereof. The stirring shaft enters the bearing housing through the upper opening and is fixed on the inner ring. A chamfered surface is provided at the top edge of the bearing housing. A rotary seal is provided on the chamfered surface. The lower opening of the bearing inner cover is rotationally fitted on the rotary seal. The drive seat is fixed on the top surface of the bearing housing. A tubing is filled in the secondary oil passage. The diameter of the tubing is smaller than the diameter of the secondary oil passage. Two-thirds of the tubing extends outside the secondary oil passage. The drive seat protrudes upward and is located on the rotation path of the tubing following the secondary oil passage. When the tubing rotates into contact with the drive seat, it is driven by the drive seat and inclines toward the rotary seal. When the tubing rotates away from the drive seat, the tubing loses the drive and inclines toward the inner ring.

[0006] As a further preference, the tubing is a rubber corrugated pipe. The drive seat extends into the inner ring and is higher than the inner ring.

[0007] As a further preference, the top surface of the bearing housing and the top surface of the inner ring incline toward the axis direction.

[0008] As a further preference, the bearing assembly further includes a first bearing assembly installed on the top of the mixing tank. The first bearing assembly and the second bearing assembly ensure the smooth rotation of the stirring shaft.

[0009] As a further preference, a stepped portion is provided above the edge of the bearing housing. An outer bearing cover is sleeved outside the bearing housing. A bent portion is provided at the bottom edge of the outer bearing cover. The bent portion is connected to the stepped portion. A first O-shaped groove is provided between the bent portion and the stepped portion. A second O-ring seal is provided in the first O-shaped groove. After the bent portion and the stepped portion are connected, the sealing performance is improved through the second O-ring seal. An outwardly protruding shoulder is provided on the outer circumferential surface of the part of the bearing housing located inside the outer bearing cover. A second O-shaped groove is also provided on the shoulder. A second O-ring seal is also provided in the second O-shaped groove. The shoulder is sealed on the cavity wall of the outer bearing cover through the second O-ring seal. The top of the outer bearing cover covers above the bearing inner cover and is provided with a through hole. The stirring shaft enters the bearing inner cover through the through hole and is fixed on the inner ring.

[0010] As a further preference, a cavity is formed between the bottom of the inner cavity of the outer bearing cover and the conical outer surface of the bearing inner cover. The bottom of the cavity communicates with the top surface of the shoulder.

[0011] As a further preference, a plurality of flinging holes are arranged in an annular array on the bearing outer cover, and the interior of the flinging holes communicates with the cavity channel.

[0012] As a further preference, an assembly hole is opened upward from the bottom of the stirring tank, and a gasket is provided between the bottom of the bearing seat and the bottom of the cavity of the stirring tank, and the gasket is fixed between the bottom of the cavity of the stirring tank and the bearing seat through the assembly hole and bolts.

[0013] The beneficial effects of the present invention compared with the prior art are as follows:

[0014] 1. When the stirring shaft rotates, it drives the inner ring of the bearing to rotate, the inner ring drives the rotating sleeve to rotate, and the rotating sleeve drives the bearing inner cover to rotate. Since the inner ring is located below the rotating sleeve and is covered by the bearing inner cover, and the edge of the bearing inner cover is rotatably fitted on the rotary seal, the edge of the bearing inner cover is sealed, and at the same time the inner ring is also sealed. When the stirring shaft stirs the chemical agent, the chemical agent will not enter the inner ring. Since the inner ring is the core component of the bearing, such as the inner ring is composed of an internal steel ring and rolling elements, the corrosion resistance of the inner ring is improved, and the service life of the bearing is improved. Since the inner ring will not corrode and deform, the cooperation relationship with the stirring shaft can be guaranteed, thereby ensuring the smooth rotation of the stirring shaft and thus ensuring the stirring efficiency.

[0015] 2. The second bearing assembly in the present invention is an end face bearing on the stirring shaft. The present invention can also use the intermediate bearing in the comparative document, set it in the middle of the stirring shaft, and set a fixing bracket on the intermediate bearing, and set the other end of the fixing bracket on the cavity wall of the stirring tank, which can further improve the stability of the stirring shaft on the premise of improving the performance of the second bearing assembly.

[0016] 3. In addition, every time the oil pipe rotates to the same position as the drive seat rotates, it will be blocked by the drive seat. At this time, the oil pipe will deflect upward once by using the characteristics of its flexible corrugations. Coupled with its centripetal rotation effect, the lubricating oil is flung towards the inner surface of the bearing inner cover. Since the bearing inner cover is conical, its inner surface has a taper. Once the lubricating oil is flung onto the inner surface of the bearing inner cover, it will flow along the inner surface of the bearing inner cover to the edge of the bearing inner cover, and flow from the inner surface edge of the bearing inner cover to the rotary seal, and penetrate into the contact surface between the bearing inner cover and the rotary seal, improving the service life of the rotary seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a top plan view schematic diagram of the stirring device provided by the embodiment of the present invention;

[0018] Figure 2 It is a plan view schematic diagram of the stirring device provided by the embodiment of the present invention after being cut open from part A Figure 1 led out;

[0019] Figure 3 The stirring device provided by the embodiment of the present invention is composed of Figure 2 An enlarged schematic view of part B drawn out;

[0020] Figure 4 A schematic view of the stirring device provided by the embodiment of the present invention after being partially cut open;

[0021] Figure 5 The stirring device provided by the embodiment of the present invention is composed of Figure 4 An enlarged schematic view of part C drawn out;

[0022] Figure 6 A schematic view of only the second bearing assembly of the stirring device provided by the embodiment of the present invention.

[0023] In the figure: 1, stirring tank; 2, first bearing assembly; 3, second bearing assembly; 4, bearing seat; 5, bearing; 6, bearing inner cover; 8, stirring shaft; 7, inner ring; 9, rotating sleeve; 10, oil passage; 11, driving seat; 12, auxiliary oil passage; 13, upper opening; 14, lower opening; 15, chamfered surface; 16, rotary seal; 17, oil pipe; 18, stepped portion; 19, bearing outer cover; 20, bent portion; 21, first O-shaped groove; 22, first O-shaped sealing ring; 23, ring shoulder; 24, second O-shaped groove; 25, second O-shaped sealing ring; 26, through hole; 27, cavity; 28, slinging hole; 29, assembly hole; 30, gasket. Specific Embodiments

[0024] The above and other embodiments and advantages of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of them.

[0025] In one embodiment, as Figures 1-6 shown:

[0026] This embodiment provides a stirring device, including a stirring tank 1 and a bearing assembly arranged in the stirring tank 1. The bearing assembly includes a second bearing assembly 3 installed at the bottom of the inner cavity of the stirring tank 1. The second bearing assembly 3 includes a bearing seat 4, a bearing 5 arranged in the bearing seat 4, and a bearing inner cover 6 installed on the bearing seat 4. The bearing 5 is enclosed in the bearing inner cover 6. The stirring shaft 8 is fixed on the inner ring 7 of the bearing 5. A rotating sleeve 9 is installed on the inner ring 7. An oil passage 10 is provided between the stirring shaft 8 and the rotating sleeve 9. The oil passage 10 communicates with the inner ring 7 and automatically lubricates the inner ring 7 in a sealed state of the bearing 5. A driving seat 11 is provided on the bearing seat 4. The driving seat 11 is located on the rotation path of the oil passage 10 following the rotating sleeve 9, for slinging lubricating oil onto the driving seat 11, and the driving seat 11 slings the lubricating oil onto the bearing inner cover 6.

[0027] The oil passage 10 is opened from the top end to the bottom end of the stirring shaft 8. A secondary oil passage 12 communicating with the outer cylindrical surface of the rotating sleeve 9 is provided at the bottom end of the oil passage 10. The secondary oil passage 12 inclines above the inner ring 7. The bearing inner cover 6 is an inverted conical cover. An upper opening 13 is provided at the small top end thereof, and a lower opening 14 is provided at the large bottom end thereof. The stirring shaft 8 enters the bearing housing 4 through the upper opening 13 and is fixed on the inner ring 7. A chamfered surface 15 is provided at the top edge of the bearing housing 4. A rotary seal 16 is provided on the chamfered surface 15. The lower opening 14 of the bearing inner cover 6 is rotationally fitted on the rotary seal 16. The driving seat 11 is fixed on the top surface of the bearing housing 4. A tubing 17 is filled in the secondary oil passage 12. The diameter of the tubing 17 is smaller than the diameter of the secondary oil passage 12. Two-thirds of the tubing 17 extends outside the secondary oil passage 12. The driving seat 11 protrudes upward and is located on the rotation path of the tubing 17 following the secondary oil passage 12. When the tubing 17 rotates to contact the driving seat 11, it is driven by the driving seat 11 and inclines toward the rotary seal 16. When the tubing 17 rotates to separate from the driving seat 11, the tubing 17 loses the drive and inclines toward the inner ring 7.

[0028] The tubing 17 is a rubber bellows. The driving seat 11 extends into the inner ring 7 and is higher than the inner ring 7.

[0029] A cavity 27 is formed between the bottom of the inner cavity of the bearing outer cover 19 and the conical outer surface of the bearing inner cover 6. The bottom of the cavity 27 communicates with the top surface of the annular shoulder 23.

[0030] A plurality of throwing holes 28 are annularly arrayed on the bearing outer cover 19. The inside of the throwing holes 28 communicates with the cavity 27.

[0031] The present invention improves the second bearing assembly 3, and its principle and technical effects are as follows: When the stirring shaft 8 rotates, it drives the inner ring 7 of the bearing 5 to rotate. The inner ring 7 drives the rotating sleeve 9 to rotate. The rotating sleeve 9 drives the bearing inner cover 6 to rotate. Since the inner ring 7 is located below the rotating sleeve 9 and is covered by the bearing inner cover 6, and the edge of the bearing inner cover 6 is rotationally fitted on the rotary seal 16, the edge of the bearing inner cover 6 is sealed, and at the same time the inner ring 7 is also sealed. When the stirring shaft 8 stirs the chemical agent (the medium to be stirred), the chemical agent will not enter the inner ring 7. Since the inner ring 7 is the core component of the bearing 5, if the inner ring 7 is composed of an internal steel ring and rolling elements, the corrosion resistance of the inner ring 7 is improved, and the service life of the bearing 5 is improved. Since the inner ring 7 will not corrode and deform, the mating relationship with the stirring shaft 8 can be guaranteed, thereby ensuring the smooth rotation of the stirring shaft 8 and ensuring the stirring efficiency.

[0032] In addition, the bearing 5 is installed in the mixing tank 1 through the bearing housing 4. On the premise of ensuring the sealing state of the bearing 5, it is also ensured that the bearing 5 is in the chemical agent. The heat generated when the bearing 5 rotates due to the rotation of the mixing shaft 8 is released into the chemical agent through the bearing housing 4, ensuring that the bearing 5 is always in a cooled environment. In addition, when the inner ring 7 of the bearing 5 drives the rotating sleeve 9 to rotate, the rotating sleeve 9 drives the bearing inner cover 6 to rotate. The lower opening 14 of the bearing inner cover 6 rotates along the rotary seal 16, and the rotary seal 16 is sealed on the annular shoulder 23. The bearing inner cover 6 is equivalent to the outer bearing of the intermediate bearing mentioned in the prior art, and the bearing 5 is equivalent to the inner bearing of the intermediate bearing mentioned in the prior art, and can also bear the radial force (surface force). The second bearing assembly 3 in the present invention is an end face bearing on the mixing shaft 8. The present invention can also use the intermediate bearing in the comparative document, set it in the middle of the mixing shaft 8, and set a fixed bracket on the intermediate bearing, and set the other end of the fixed bracket on the cavity wall of the mixing tank 1, which can further improve the stability of the mixing shaft 8 on the premise of improving the performance of the second bearing assembly 3.

[0033] The second bearing assembly 3 also has reasonable lubricity. Lubricating oil is injected into the oil passage 10 from the outside of the top end of the mixing shaft 8. Under the action of the rotation of the mixing shaft 8, the lubricating oil flows along the oil passage 10 into the sub-oil passage 12, and then flows from the sub-oil passage 12 into the inner ring 7 of the bearing 5. At this time, the mixing shaft 8 drives the inner ring 7 to rotate, and the inner ring 7 rotates and lubricates at the same time, improving the lubrication efficiency. When lubricating, the mixing shaft 8 does not need to stop rotating, nor will it affect the normal mixing of the mixing tank 1. In addition, part of the lubricating oil flows into the oil pipe 17 and flows into the inner ring 7 from the oil pipe 17. When the mixing shaft 8 rotates, it will also drive the oil passage 10 and the sub-oil passage 12 to rotate synchronously, and the sub-oil passage 12 will drive the oil pipe 17 to rotate 360 degrees relative to the upper part of the inner ring 7, so that the inner ring 7 reaches the purpose of uniform lubrication. In addition, every time the oil pipe 17 rotates to the same position as the drive seat 11 rotates, it will be blocked by the drive seat 11. At this time, the oil pipe 17 will use the characteristics of its flexible corrugation to deflect upward once. Coupled with its 360-degree centrifugal rotation effect, the lubricating oil is thrown towards the inner surface of the bearing inner cover 6. Since the bearing inner cover 6 is conical, its inner surface has a taper. Once the lubricating oil is thrown onto the inner surface of the bearing inner cover 6, it will flow along the inner surface of the bearing inner cover 6 to the edge of the bearing inner cover 6, and flow from the inner surface edge of the bearing inner cover 6 to the rotary seal 16, and penetrate into the contact surface between the bearing inner cover 6 and the rotary seal 16, improving the service life of the rotary seal 16.

[0034] Such as Figure 5 、 Figure 6As shown in the figure, a through hole 26 is provided at the top end of the bearing outer cover 19, and the aperture of the through hole 26 is larger than the shaft diameter of the stirring shaft 8. Therefore, during stirring, part of the chemical agent will flow into the bearing outer cover 19 through the through hole 26. However, since the bearing inner cover 6 is fixed to the stirring shaft 8, it will not penetrate into the bearing inner cover 6, nor will it corrode the bearing 5, nor will it corrode the inner ring 7, nor will it corrode the rolling elements in the inner ring 7. Instead, it will flow into the cavity 27 between the bearing inner cover 6 and the bearing outer cover 19, which not only ensures the normal rotation of the stirring shaft 8, but also cools the bearing 5 for a long time by bringing the chemical agent close to the bearing 5. When the chemical agent is stirred and discharged outside the stirring tank 1, the bearing inner cover 6 rotates normally with the stirring shaft 8, so that the chemical agent in the cavity 27 is discharged outward through the slinging holes 28, avoiding residue after stirring.

[0035] As Figure 3 , Figure 6 shown in the figure, an assembly hole 29 is provided upward from the bottom of the stirring tank 1, and a sealing gasket 30 is provided between the bottom of the bearing seat 4 and the bottom of the cavity of the stirring tank 1. The sealing gasket 30 is fixed between the bottom of the cavity of the stirring tank 1 and the bearing seat 4 through the assembly hole 29 and bolts. The setting of the sealing gasket 30 seals between the bottom of the bearing seat 4 and the bottom of the cavity of the stirring tank 1, preventing the chemical agent from penetrating into the bearing 5 from the bottom.

[0036] Above the edge of the bearing seat 4, there is a stepped portion 18. An outer bearing cover 19 is sleeved outside the bearing seat 4. The bottom edge of the bearing outer cover 19 is provided with a bent portion 20, and the bent portion 20 is connected to the stepped portion 18. A first O-shaped groove 21 is provided between the bent portion 20 and the stepped portion 18, and a first O-shaped sealing ring 22 is provided in the first O-shaped groove 21. After the bent portion 20 and the stepped portion 18 are connected, the sealing performance is improved through the first O-shaped sealing ring 22. An outwardly protruding shoulder 23 is provided on the outer cylindrical surface of the part of the bearing seat 4 located inside the bearing outer cover 19. A second O-shaped groove 24 is also provided on the shoulder 23, and a second O-shaped sealing ring 25 is also provided in the second O-shaped groove 24. The shoulder 23 is sealed on the cavity wall of the bearing outer cover 19 through the second O-shaped sealing ring 25. The top of the bearing outer cover 19 covers above the bearing inner cover 6 and is provided with a through hole 26. The stirring shaft 8 enters the bearing inner cover 6 through the through hole 26 and is fixed on the inner ring 7. The bearing seat 4 is sealed inside the bearing outer cover 19 through the first O-shaped sealing ring 22, and the shoulder 23 on the outer cylindrical surface of the bearing seat 4 is sealed on the cavity wall of the bearing outer cover 19 through the second O-shaped sealing ring 25. At the same time, the chemical agent flowing into the cavity 27 is only restricted in the cavity 27, which is convenient for quick ejection after stirring.

[0037] As Figure 6 shown in the figure, the top surface of the bearing seat 4 and the top surface of the inner ring 7 are inclined towards the axis direction. The excess lubricating oil thrown onto the rotary seal 16 will flow back into the inner ring 7 along the inclined surfaces on the top surface of the bearing seat 4 and the top surface of the inner ring 7, avoiding waste.

[0038] It should be further noted that the bearing group further includes a first bearing assembly 2 installed at the top of the mixing tank 1, and the rotation of the mixing shaft 8 is ensured to be stable through the first bearing assembly 2 and the second bearing assembly 3. The structure of the first bearing assembly 2 can be the same as that of the second bearing assembly 3, which can also improve the corrosion resistance.

[0039] The above orientation references do not represent the specific orientations of the components in this implementation solution. This implementation solution is only for the convenience of describing the solution, and relative descriptions are set with reference to the orientations in the figures. In essence, the specific orientations of the components are based on their actual installation, actual use, and the habitual orientation descriptions of those skilled in the art. This is hereby stated.

[0040] The specific implementation manners described above further elaborate on the invention purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are only the specific implementation manners of the present invention and are not used to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Stirring device, characterized in that, It includes a mixing tank (1) and a bearing group arranged inside the mixing tank (1). The bearing group includes a second bearing assembly (3) installed at the bottom of the inner cavity of the mixing tank (1). The second bearing assembly (3) includes a bearing seat (4), a bearing (5) arranged inside the bearing seat (4), and a bearing inner cover (6) installed on the bearing seat (4). The bearing (5) is enclosed in the bearing inner cover (6). A mixing shaft (8) is fixed on the inner ring (7) of the bearing (5). A rotating sleeve (9) is installed on the inner ring (7). An oil passage (10) is provided between the mixing shaft (8) and the rotating sleeve (9). The oil passage (10) communicates with the inner ring (7) and automatically lubricates the inner ring (7) in a sealed state of the bearing (5). A driving seat (11) is provided on the bearing seat (4). The driving seat (11) is located on the rotation path of the oil passage (10) following the rotating sleeve (9) to throw lubricating oil onto the driving seat (11), and the driving seat (11) throws the lubricating oil onto the bearing inner cover (6).

2. The stirring device according to claim 1, characterized in that, The oil passage (10) is opened from the top end to the bottom end of the mixing shaft (8). A secondary oil passage (12) communicating with the outer cylindrical surface of the rotating sleeve (9) is provided at the bottom end of the oil passage (10). The secondary oil passage (12) inclines above the inner ring (7). The bearing inner cover (6) is an inverted conical cover. An upper opening (13) is provided at the small top end thereof, and a lower opening (14) is provided at the large bottom end thereof. The mixing shaft (8) enters the bearing seat (4) through the upper opening (13) and is fixed on the inner ring (7). A chamfered surface (15) is provided at the top edge of the bearing seat (4). A rotary seal (16) is provided on the chamfered surface (15). The lower opening (14) of the bearing inner cover (6) is rotationally fitted on the rotary seal (16). The driving seat (11) is fixed on the top surface of the bearing seat (4). A tubing (17) is filled in the secondary oil passage (12). The diameter of the tubing (17) is smaller than the diameter of the secondary oil passage (12). Two-thirds of the tubing (17) extends outside the secondary oil passage (12). The driving seat (11) protrudes upward and is located on the rotation path of the tubing (17) following the secondary oil passage (12). When the tubing (17) rotates to contact the driving seat (11), it is driven by the driving seat (11) and inclines towards the rotary seal (16). When the tubing (17) rotates to separate from the driving seat (11), the tubing (17) loses the drive and inclines towards the inner ring (7).

3. The stirring device according to claim 2, wherein The tubing (17) is a rubber bellows. The driving seat (11) extends into the inner ring (7) and is higher than the inner ring (7).

4. The stirring device according to claim 3, characterized in that, The top surface of the bearing seat (4) and the top surface of the inner ring (7) incline towards the axis direction.

5. The stirring device according to claim 4, characterized in that, The bearing group further includes a first bearing assembly (2) installed at the top of the mixing tank (1), and the rotation of the mixing shaft (8) is ensured to be stable by the first bearing assembly (2) and the second bearing assembly (3).

6. The stirring device according to claim 5, characterized in that, A stepped portion (18) is provided above the edge of the bearing seat (4). An outer bearing cover (19) is sleeved outside the bearing seat (4). A bent portion (20) is provided at the bottom edge of the outer bearing cover (19). The bent portion (20) is connected to the stepped portion (18). A first O-shaped groove (21) is formed between the bent portion (20) and the stepped portion (18). A first O-shaped sealing ring (22) is arranged in the first O-shaped groove (21). After the bent portion (20) and the stepped portion (18) are connected, the sealing performance is improved by the first O-shaped sealing ring (22). An outwardly protruding ring shoulder (23) is provided on the outer circumferential surface of the part of the bearing seat (4) located inside the outer bearing cover (19). A second O-shaped groove (24) is also formed on the ring shoulder (23). A second O-shaped sealing ring (25) is also arranged in the second O-shaped groove (24). The ring shoulder (23) is sealed on the cavity wall of the outer bearing cover (19) through the second O-shaped sealing ring (25). The top of the outer bearing cover (19) covers above the inner bearing cover (6) and is provided with a through hole (26). The mixing shaft (8) enters the inner bearing cover (6) through the through hole (26) and is fixed on the inner ring (7).

7. The stirring device according to claim 6, characterized in that A cavity (27) is formed between the bottom of the inner cavity of the outer bearing cover (19) and the conical outer surface of the inner bearing cover (6). The bottom of the cavity (27) communicates with the top surface of the ring shoulder (23).

8. The stirring device according to claim 7, characterized in that, A plurality of throwing holes (28) are formed in an annular array on the outer bearing cover (19). The inside of the throwing holes (28) communicates with the cavity (27).

9. The stirring device according to claim 8, wherein An assembly hole (29) is formed upward from the bottom of the mixing tank (1). A sealing gasket (30) is provided between the bottom of the bearing seat (4) and the bottom of the cavity of the mixing tank (1). The sealing gasket (30) is fixed between the bottom of the cavity of the mixing tank (1) and the bearing seat (4) through the assembly hole (29) and bolts.

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