Sealing structure for shaft of horizontal stirrer for slurry treatment

Abstract

The utility model discloses a sealing structure for a shaft of a horizontal stirrer for slurry treatment, which belongs to the technical field of shaft end sealing and comprises a shaft sleeve and an inner shaft sleeve which are tightly connected, and a limiting block, a sealing box, a static ring I, an outer moving ring, a spring seat, an inner moving ring, a static ring II, a gland, a steam seal gland and a plurality of steam seal seats are sequentially arranged from the shaft sleeve to the inner shaft sleeve. Push rings are arranged at the two ends of the spring seat, a machine seal spring is arranged in the spring seat, the two ends of the spring seat are connected with the push rings through corrugated pipes, and the limiting block and the sealing box, the sealing box and the static ring I, the spring seat and the push rings, and the gland and the static ring II are fixedly connected through fastening screws; the problem that normal and stable operation of equipment is affected due to the fact that a horizontal stirrer for slurry treatment in polycrystalline silicon production is prone to silane gas leakage is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of shaft end seals, and particularly relates to a shaft seal structure for a horizontal agitator used in slurry treatment. Background Art

[0002] In the slurry treatment section of polysilicon production, horizontal agitators are used to process materials, and a large number of horizontal agitators are used. In this field, silane gas often leaks in the horizontal agitator for slurry treatment, which affects the operation of workers, pollutes the working environment and the health of workers, and does not meet the environmental protection requirements. At the same time, the silane gas contains fine silicon powder, which easily damages the mechanical seal, increases the spare part cost, and increases the workload of maintenance workers. Summary of the Utility Model

[0003] The utility model aims to solve the problem that the horizontal agitator for slurry treatment in polysilicon production is prone to silane gas leakage, which affects the normal and safe operation of the equipment.

[0004] In order to achieve the above invention purpose, the technical solution of the utility model is as follows:

[0005] A shaft seal structure for a horizontal agitator used in slurry treatment, comprising a tightly connected shaft sleeve and an inner shaft sleeve. A limit block, a seal box, a stationary ring I, an outer moving ring, a spring seat, an inner moving ring, a stationary ring II, a gland, a steam seal gland and a plurality of steam seal seats are arranged in sequence from the shaft sleeve to the inner shaft sleeve direction. Push rings are arranged at both ends of the spring seat, a mechanical seal spring is arranged inside the spring seat, and the two ends of the spring seat are connected to the push rings through bellows. The limit block and the seal box, between the seal box and the stationary ring I, between the spring seat and the push rings, and between the gland and the stationary ring II are all fixedly connected through fastening screws.

[0006] Further, the shaft sleeve and the inner shaft sleeve are sealed with a wedge-shaped sealing ring.

[0007] Further, a seal O-ring I is installed between the seal box and the stationary ring I, a seal O-ring II is installed between the push ring and the inner moving ring, and a seal O-ring III is installed between the gland and the stationary ring II.

[0008] Further, the outer moving ring and the inner moving ring are moving rings made of silicon carbide or silicon nitride materials; the stationary ring I and the stationary ring II are stationary rings made of alloy materials.

[0009] Further, a steam seal seat A, a steam seal seat B and a steam seal seat C are arranged at the rear end of the steam seal gland. Three-lobe rings and six-lobe rings are installed inside the steam seal seat A, the steam seal seat B and the steam seal seat C. The steam seal seat A, the steam seal seat B and the steam seal seat C are connected to the steam seal gland through fastening screws.

[0010] Furthermore, both the gland and the steam seal gland are fixed to the support structure by fastening screws. After the support structure is installed and connected to the steam seal seats A, B, and C, a pressure chamber is formed. The support structure is provided with a nitrogen purge inlet and a nitrogen purge outlet that communicate with the pressure chamber.

[0011] Advantages of the present utility model:

[0012] 1. In the present utility model, the mechanical seal, the primary seal assembly, and the sealing ring structures in this solution are used in combination. The mechanical seal uses a bellows as a compensation mechanism to ensure that when the friction pair at the outer end of the mechanical seal fails, there will be no large amount of lubricating oil leakage. At the same time, the shaft seal structure in this solution is a double-end mechanical seal, which can effectively reduce problems such as material leakage and material waste.

[0013] 2. In the present utility model, the bellows preferably adopts a metal bellows structure. The outer dynamic ring and the inner dynamic ring are made of silicon carbide or silicon nitride material. The static ring I and the static ring II are alloy material static rings, and the static ring is an integral alloy, effectively ensuring the mechanical seal effect and also being able to adapt to the operating environment of 85 - 110 °C.

[0014] 3. In the present utility model, when the shaft seal structure cools down from the operating temperature to room temperature, the mechanical seal can still ensure no leakage.

[0015] 4. In the present utility model, the shaft sleeve and the inner shaft sleeve are sealed with a wedge-shaped sealing ring, and the outer end structure is mainly locked with fastening screws, with good sealing effect.

[0016] 5. In the present utility model, an independent nitrogen purge structure is added, including a nitrogen purge inlet and a nitrogen purge outlet opened on the support structure, with a normal operating pressure of 0.02 - 0.03 MPa, ensuring the safe and stable operation of the equipment. Description of the drawings

[0017] Figure 1 is a cross-sectional schematic view of the shaft seal structure in the present utility model Figure 1 。

[0018] Figure 2 is a cross-sectional schematic view of the shaft seal structure in the present utility model Figure 2 。

[0019] Figure 3 is a cross-sectional schematic view of the shaft seal structure Figure 3 。

[0020] Among them, 1. Sleeve; 2. Inner sleeve; 3. Limit block; 4. Sealing box; 5. Stationary ring I; 6. Outer moving ring; 7. Spring seat; 8. Inner moving ring; 9. Stationary ring II; 10. Gland; 11. Steam seal gland; 12. Pushing ring; 13. Mechanical seal spring; 14. Bellows; 15. Wedge-shaped sealing ring; 16. Sealing O-ring I; 17. Sealing O-ring II; 18. Sealing O-ring III; 19. Steam seal seat A; 20. Steam seal seat B; 21. Steam seal seat C; 22. Three-lobe ring; 23. Six-lobe ring; 24. Support structure; 25. Pressure chamber; 26. Nitrogen purge inlet; 27. Nitrogen purge outlet; 28. Fastening screw I; 29. Fastening screw II; 30. Fastening screw III; 31. Fastening screw IV; 32. Fastening screw V; 33. Fastening screw VI; 34. Fastening screw VII; 35. Fastening screw VIII; 36. Sealing gasket; 37. Pressure plate. Specific embodiments

[0021] The present utility model will be further described in detail below in conjunction with embodiments, but the embodiments of the present utility model are not limited thereto.

[0022] Embodiment 1

[0023] This embodiment is a basic implementation mode. A shaft sealing structure for a horizontal stirrer for slurry treatment includes a tightly connected sleeve 1 and inner sleeve 2. Refer to Figure 1 , a limit block 3, a sealing box 4, a stationary ring I 5, an outer moving ring 6, a spring seat 7, an inner moving ring 8, a stationary ring II 9, a gland 10, a steam seal gland 11 and a plurality of steam seal seats are sequentially arranged from the sleeve 1 to the inner sleeve 2 direction. Figure 1 , 2 The structure diagram shown in Figure 2 shows a shaft sealing structure including three steam seal seats, namely steam seal seat A 19, steam seal seat B 20, and steam seal seat C 21. Pushing rings 12 are provided at both ends of the spring seat 7, a mechanical seal spring 13 is arranged inside the spring seat 7, and the two ends of the spring seat 7 are connected to the pushing rings 12 through bellows 14. Refer to

[0024] The limit block 3 and the sealing box 4, the sealing box 4 and the stationary ring I 5, the spring seat 7 and the pushing ring 12, and the gland 10 and the stationary ring II 9 are all fixedly connected by fastening screws.

[0024] Embodiment 2

[0025] This embodiment is a further optimization on the basis of Embodiment 1. The difference is that, refer to Figure 1 , the sleeve 1 and the inner sleeve 2 are sealed by a wedge-shaped sealing ring 15.

[0026] Embodiment 3

[0027] Compared with Embodiments 1-2, the difference in this embodiment is that, refer to Figure 1, a sealing O-ring I 16 is installed between the sealed box 4 and the stationary ring I 5, a sealing O-ring II 17 is installed between the push ring 12 and the inner moving ring 8, and a sealing O-ring III 18 is installed between the gland 10 and the stationary ring II 9.

[0028] Embodiment 4

[0029] Compared with Embodiments 1-3, this embodiment is different in that, referring to Figure 2 , the outer moving ring 6 and the inner moving ring 8 are moving rings made of silicon carbide or silicon nitride materials; the stationary ring I 5 and the stationary ring II 9 are stationary rings made of alloy materials.

[0030] Embodiment 5

[0031] Compared with Embodiments 1-4, this embodiment is different in that a steam seal seat A 19, a steam seal seat B 20 and a steam seal seat C 21 are provided at the rear end of the steam seal gland 11. Referring to Figure 1 , three-lobe rings 22 and six-lobe rings 23 are installed in the steam seal seat A 19, the steam seal seat B 20 and the steam seal seat C 21, and the steam seal seat A 19, the steam seal seat B 20 and the steam seal seat C 21 are connected to the steam seal gland 11 by fastening screws.

[0032] Embodiment 6

[0033] Compared with Embodiment 5, this embodiment is different in that

[0034] Referring to Figure 1 , the gland 10 and the steam seal gland 11 are both fixed on the support structure 24 by fastening screws. After the support structure 24 is installed and connected with the steam seal seat A 19, the steam seal seat B 20 and the steam seal seat C 21, a pressure chamber 25 is formed. A nitrogen purge inlet 26 and a nitrogen purge outlet 27 communicating with the pressure chamber 25 are provided on the support structure 24.

[0035] Embodiment 7

[0036] To facilitate the public's understanding of this solution, this embodiment takes the shaft seal structure of a horizontal agitator for slurry treatment as an example to further illustrate this solution.

[0037] Referring to Figure 3 , the shaft seal structure includes a closely connected shaft sleeve 1 and an inner shaft sleeve 2. In the direction from the shaft sleeve 1 to the inner shaft sleeve 2, a limit block 3, a sealed box 4, a stationary ring I 5, an outer moving ring 6, a spring seat 7, an inner moving ring 8, a stationary ring II 9, a gland 10, a steam seal gland 11, and three steam seal seats, namely a steam seal seat A 19, a steam seal seat B 20 and a steam seal seat C 21, are arranged in sequence. The three steam seal seats are located at the rear end of the steam seal gland 11. Push rings 12 are provided at both ends of the spring seat 7, and a mechanical seal spring 13 is arranged inside the spring seat 7. Referring to Figure 2 , both ends of the spring seat 7 are connected to the push ring 12 through a bellows 14.

[0038] In this embodiment, the limiting block 3 and the sealing box 4 are fixedly connected by fastening screw Ⅰ28. The sealing box 4 and the stationary ring Ⅰ5 are fixedly connected by fastening screw Ⅱ29 and are embedded with a sealing O-ring Ⅰ16. The spring seat 7 and the push ring 12 are fixedly connected by fastening screw Ⅲ30. The gland 10 and the stationary ring Ⅱ9 are restricted in their movement range by the pressing plate 37 and fastening screw Ⅳ31. The gland 10 and the sealing box 4 are fixedly connected by fastening screw Ⅴ32.

[0039] In this embodiment, the shaft sleeve 1 and the inner shaft sleeve 2 are sealed with a wedge-shaped sealing ring 15. A sealing O-ring Ⅱ17 is installed between the push ring 12 and the inner moving ring 8, and a sealing O-ring Ⅲ18 is installed between the gland 10 and the stationary ring Ⅱ9.

[0040] In this embodiment, the outer moving ring 6 and the inner moving ring 8 are moving rings made of silicon carbide or silicon nitride materials; the stationary ring Ⅰ5 and the stationary ring Ⅱ9 are stationary rings made of alloy materials, and the stationary rings preferably use an integral alloy structure.

[0041] In this embodiment, three-lobe rings 22 and six-lobe rings 23 are installed in the steam seal seats A19, B20, and C21. The steam seal seats A19, B20, and C21 are connected to the steam seal gland 11 by fastening screw Ⅷ35.

[0042] In this embodiment, the gland 10 and the steam seal gland 11 are both fixed on the support structure 24 by fastening screws. After the support structure 24 is installed and connected to the steam seal seats A19, B20, and C21, a pressure chamber 25 is formed. The support structure 24 is provided with a nitrogen purge inlet 26 and a nitrogen purge outlet 27 communicating with the pressure chamber 25. The gland 10 is fixedly connected to the support structure 24 by fastening screw Ⅵ33, and the steam seal cover is fixedly connected to the support structure 24 by fastening screw Ⅶ34.

[0043] In this solution, preferably, a silicon carbide layer is plated on the contact surface between the shaft sleeve 1 and other sealing components. The coating thickness is ≥0.5 mm, and the surface roughness Ra is 1.6. The sealing effect is good. The optimized equipment can operate continuously without failure for more than 6 months under the operating temperature condition of 85 - 110°C.

Claims

1. A shaft sealing structure for a horizontal agitator for slurry treatment, characterized in that: The invention comprises a shaft sleeve (1) and an inner shaft sleeve (2) which are tightly connected. A limit block (3), a sealing box (4), a static ring I (5), an outer dynamic ring (6), a spring seat (7), an inner dynamic ring (8), a static ring II (9), a gland (10), a steam seal gland (11) and a plurality of steam seal seats are arranged in sequence from the shaft sleeve (1) to the inner shaft sleeve (2). Push rings (12) are arranged at both ends of the spring seat (7). A mechanical seal spring (13) is arranged in the spring seat (7). Both ends of the spring seat (7) are connected to the push ring (12) via a bellows (14). The limit block (3) and the sealing box (4), the sealing box (4) and the static ring I (5), the spring seat (7) and the push ring (12), and the gland (10) and the static ring II (9) are all fixedly connected via fastening screws.

2. The shaft sealing structure of a horizontal agitator for slurry treatment according to claim 1, characterized in that: The shaft sleeve (1) and the inner shaft sleeve (2) are sealed by a wedge-shaped sealing ring (15).

3. The shaft sealing structure of a horizontal agitator for slurry treatment according to claim 1, characterized in that: A sealing O-ring I (16) is installed between the sealing box (4) and the stationary ring I (5), a sealing O-ring II (17) is installed between the push ring (12) and the inner moving ring (8), and a sealing O-ring III (18) is installed between the pressure cover (10) and the stationary ring II (9).

4. The shaft sealing structure of a horizontal agitator for slurry treatment according to claim 1, characterized in that: The outer dynamic ring (6) and the inner dynamic ring (8) are dynamic rings made of silicon carbide or silicon nitride; and the stationary ring I (5) and the stationary ring II (9) are stationary rings made of alloy material.

5. The shaft sealing structure of a horizontal agitator for slurry treatment according to claim 1, characterized in that: A steam seal seat A (19), a steam seal seat B (20) and a steam seal seat C (21) are provided at the rear end of the steam seal gland (11). A three-petal ring (22) and a six-petal ring (23) are installed in the steam seal seat A (19), the steam seal seat B (20) and the steam seal seat C (21). The steam seal seat A (19), the steam seal seat B (20) and the steam seal seat C (21) are connected to the steam seal gland (11) by fastening screws.

6. The shaft sealing structure of a horizontal agitator for slurry treatment according to claim 5, characterized in that: The gland (10) and the steam seal gland (11) are both fixed to the support structure (24) by means of fastening screws. The support structure (24) is installed and connected with the steam seal seat A (19), the steam seal seat B (20), and the steam seal seat C (21) to form a pressure chamber (25). The support structure (24) is provided with a nitrogen purge inlet (26) and a nitrogen purge outlet (27) which are in communication with the pressure chamber (25).

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