Sealing device for granular polycrystalline silicon surface dust removal equipment

Abstract

The utility model relates to the technical field of dust removal equipment sealing, in particular to a sealing device for granular polycrystalline silicon surface dust removal equipment, which comprises a sealing hollow shaft, an outer sleeve is sleeved on the outer surface of the sealing hollow shaft, two bearings are arranged on the sealing hollow shaft and the outer sleeve, and a magnetic fluid sealing piece is arranged between the two bearings. A clean air source hole is further formed in the outer sleeve, sealing outer rings are arranged on the two sides of the magnetic fluid sealing piece, a sealing inner ring is arranged in one sealing outer ring, a sealing inner cylinder is arranged between the magnetic fluid sealing piece and the sealing hollow shaft, a first sealing ring and a second sealing ring are arranged on one side of one bearing, a groove is formed in the outer sleeve, and a sealing ring is arranged in the groove. And a sealing ring III is arranged on the groove. The combined sealing sleeve is simple in structure, low in use cost, capable of effectively improving the sealing effect and prolonging the service life by adopting the combined sealing sleeve, and suitable for wide popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal equipment sealing, in particular to a sealing device for granular polysilicon surface dust removal equipment. Background Art

[0002] Granular polysilicon contains powder on its surface, which makes it prone to technical problems such as line breakage during downstream promotion and application. Therefore, removing dust from the surface of granular polysilicon is crucial in polysilicon production, and dust removal equipment that removes dust from the surface of granular polysilicon is even more critical core equipment. However, in current production applications, due to design defects in the seals at both ends of the equipment, the dust removal equipment suffers from major safety hazards such as powder leakage and powder spraying due to seal damage, as well as production interruptions, resulting in product contamination and high maintenance costs, which significantly increases the overall production cost of granular polysilicon. In order to ensure good sealing and long online rate of the dust removal equipment, very high application requirements are placed on the two axial seals of the equipment to operate under high abrasion and high dust conditions.

[0003] After years of rapid development, sealing technology has been widely used in various industries. However, single magnetic fluid seals, mechanical seals, and dry gas seals are no longer suitable for and maintain good sealing performance in today's complex media working conditions. This is also one of the hot spots and difficulties in the current sealing field. Improving sealing effectiveness and service life, as well as cleanliness in special working conditions, can be achieved by changing the overall structural design of the seal and the use of clean materials. Currently, China's existing patented technologies are as follows:

[0004] The combined sealing device provided by China's public patent CN202410989877 consists of a rotating shaft, a first magnetic isolation ring, a sealing housing, a magnetic fluid sealing component, a labyrinth sealing component, an end cover and a brush-type sealing fan. It has certain improvements in high linear speed and multi-media working conditions, but the overall sealing design is complex and difficult to assemble. The sealing effect is not as good as expected for granular polysilicon dust removal equipment, which has low speed, large diameter, high abrasion intensity and high cleanliness.

[0005] The vertical combined sealing device disclosed in Chinese patent application CN202121812594, consisting of a shaft seal ring, mechanical seal, magnetic seal assembly, and bearing kit, is expected to achieve reliable sealing, minimal wear, and a longer service life. However, the use of this sealing kit in this equipment will irreversibly contaminate the granular polysilicon due to the introduction of contaminating media such as thermal oil. Furthermore, the sealing structure has a short service life in highly abrasive and dusty media, resulting in excessively high overall operating costs and making it unsuitable for use. No solutions have yet been proposed for these technical issues. Utility Model Content

[0006] In response to the problems in the related technology, the utility model proposes a sealing device for granular polysilicon surface dust removal equipment to overcome the above-mentioned technical problems existing in the existing related technology. The purpose of the utility model is to adopt a combined sealing kit to effectively improve the sealing effect, extend the service life, and have low cost of use, which is suitable for wide promotion.

[0007] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: A sealing device for a granular polysilicon surface dust removal device, comprising a sealing hollow shaft, the outer surface of the sealing hollow shaft is sleeved with an outer sleeve, the sealing hollow shaft and the outer sleeve are provided with two bearings, a magnetic fluid seal is provided between the two bearings, a trace amount of magnetic medium is provided inside the magnetic fluid seal, a clean air source hole is also provided on the outer sleeve, a sealing outer ring is provided on both sides of the magnetic fluid seal, a sealing inner ring is provided inside one of the sealing outer rings, a sealing inner sleeve is provided between the magnetic fluid seal and the sealing hollow shaft, a sealing ring 1 and a sealing ring 2 are respectively provided on one side of the bearing, a groove is provided on the outer sleeve, a sealing ring 3 is provided on the groove, two sealing rings 3 are provided, a clamping block 1 is installed on one side of the outer sleeve by bolt 1, and a clamping block 2 is installed on the other side of the outer sleeve by bolt 2, and a sealing ring 1 is provided between the clamping block 2 and the sealing hollow shaft.

[0008] Preferably, the sealed hollow shaft is made of metal material or non-metal material.

[0009] Preferably, the bearing is a rolling bearing or a sliding bearing.

[0010] Preferably, the second sealing ring is a V-shaped sealing ring.

[0011] Preferably, the second sealing ring is an M-shaped sealing ring.

[0012] Preferably, a sealing groove 1 is provided on one side of the sealing hollow shaft, a sealing ring 2 is provided inside the sealing groove 1, and mounting holes are provided on both the sealing hollow shaft and the outer sleeve.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model is a sealing device for granular polysilicon surface dust removal equipment. By arranging a sealing hollow shaft, an outer sleeve, a magnetic fluid seal, a sealing outer ring, a sealing inner ring, a sealing inner cylinder, a sealing ring 1, a sealing ring 2 and a sealing ring 3, a combined sealing kit is adopted. It is a unique sealing design for dust removal equipment, effectively improves the sealing effect, extends the service life, and has a low cost of use, and is suitable for wide promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic structural diagram of the cross section of the utility model.

[0016] In the accompanying drawings: 1. Sealed hollow shaft; 2. Outer sleeve; 3. Bearing; 4. Magnetic fluid seal; 5. Clean air source hole; 6. Sealed outer ring; 7. Sealed inner ring; 8. Sealed inner cylinder; 9. Sealing ring 1; 10. Sealing ring 2; 11. Sealing ring 3; 12. Clamping block 1; 13. Clamping block 2; 14. Sealing ring 1; 15. Sealing ring 2. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0018] Example 1

[0019] See also Figure 1The utility model proposes a technical solution for a sealing device for a granular polysilicon surface dust removal device: a sealing device for a granular polysilicon surface dust removal device, comprising a sealing hollow shaft 1. Specifically, the sealing hollow shaft 1 can be made of metal materials such as cast iron or stainless steel or non-metallic materials such as ceramics, including but not limited to silicon carbide, silicon nitride, etc., and is manufactured according to an integral molding process. The inner wall of the sealing hollow shaft 1 can be cleanly isolated according to process requirements or not. If clean isolation is used, the isolation method is to cast or spray a layer of high-purity clean material, such as high-purity silicon carbide or silicon nitride. One or more composite materials such as silicon or polyurethane or PEEK or PVC are used for isolation; the outer surface of the sealed hollow shaft 1 is sleeved with an outer sleeve 2, specifically, the outer sleeve 2 is made of high-purity clean materials, such as high-purity polytetrafluoroethylene, high-purity PVC, high-purity graphite and other wear-resistant materials; the sealed hollow shaft 1 and the outer sleeve 2 are provided with two bearings 3, and a magnetic fluid seal 4 is provided between the two bearings 3. A small amount of magnetic medium is provided inside the magnetic fluid seal 4. Specifically, when the equipment rotates, a layer of magnetic film with a certain thickness is formed due to the action of centrifugal force, which forms a magnetic film with the sealed hollow shaft 1. Very stable and small gap, because silicon powder is a non-magnetic fluid, when silicon powder passes through, it has a repulsive effect with the fluid, thus fundamentally ensuring that the silicon powder will not leak, the magnetic fluid seal 4 is not in direct contact with the sealed hollow shaft 1, with less wear and tear, and the sealing service life is greatly increased. At the same time, the magnetic material in the magnetic fluid seal is difficult to leak into the medium, thus fundamentally protecting the cleanliness and purity of the granular polysilicon; a clean air source hole 5 is also provided on the outer sleeve 2, and a sealing outer ring 6 is provided on both sides of the magnetic fluid seal 4, and a sealing inner ring 7 is provided inside the sealing outer ring 6. The magnetic fluid seal A sealing inner cylinder 8 is provided between the component 4 and the sealing hollow shaft 1, and a sealing ring 1 9 and a sealing ring 2 10 are respectively provided on one side of a bearing 3. A groove is provided on the outer sleeve 2, and a sealing ring 3 11 is provided on the groove. There are two sealing rings 3 11. Specifically, the sealing ring 3 11 is made of clean materials, such as high-purity polytetrafluoroethylene, high-purity PVC, high-purity graphite and other wear-resistant materials; a clamping block 12 is installed on one side of the outer sleeve 2 by a bolt 1, and a clamping block 2 13 is installed on the other side of the outer sleeve 2 by a bolt 2. A sealing ring 14 is provided between the clamping block 2 13 and the sealing hollow shaft 1.

[0020] Furthermore, the sealed hollow shaft 1 is made of metal material or non-metal material.

[0021] In this embodiment, metal materials such as cast iron or stainless steel or non-metallic materials such as ceramics, including but not limited to silicon carbide, silicon nitride, etc., are used to manufacture according to the integral molding process. The inner wall of the sealed hollow shaft 1 is cleanly isolated according to the process requirements, or it can be not isolated. If clean isolation is used, the isolation method is to cast or spray a layer of high-purity clean material, such as one or more composite materials of high-purity silicon carbide or silicon or polyurethane or PEEK or PVC for isolation.

[0022] Furthermore, the bearing 3 is a rolling bearing or a sliding bearing.

[0023] In this embodiment, the rolling bearing is a common mechanical transmission component that plays an important role in reducing friction, improving work efficiency, and extending service life. It transmits load by rolling elements (such as steel balls, rollers, etc.) rolling between inner and outer rings, reducing friction and wear, and has a low friction coefficient and high load-bearing capacity; the sliding bearing uses the friction between sliding surfaces to support and guide rotating or moving parts. Unlike rolling bearings, sliding bearings do not have rolling elements (such as rollers or steel balls), but transfer loads and reduce friction by sliding between two surfaces.

[0024] Furthermore, the sealing ring 2 10 is a V-shaped sealing ring.

[0025] Furthermore, the sealing ring 2 10 is an M-type sealing ring.

[0026] See also Figure 1 As shown, further, a sealing groove 1 is provided on one side of the sealing hollow shaft 1, a sealing ring 2 15 is provided inside the sealing groove 1, and mounting holes are provided on both the sealing hollow shaft 1 and the outer sleeve 2.

[0027] In this embodiment, by providing mounting holes, installation is facilitated and connection stability is improved.

[0028] The working principle of this utility model:

[0029] The right side of the outer sleeve 2 of this device is connected to the flange surface of the hollow shaft of the equipment through bolts, and they rotate together at a certain speed according to the working requirements of the equipment. The left side of the sealed hollow shaft 1 of this device is connected to the stationary pipe through flange bolts. The process medium passes through the inside of the sealed hollow shaft 1. The magnetic fluid seal 4, the sealing outer ring 6, the sealing inner ring 7, the sealing inner cylinder 8, the sealing ring 1 9, the sealing ring 2 10 and the sealing ring 3 11 between the sealing hollow shaft 1 and the outer sleeve 2 are a sealing assembly. The sealing ring 3 11 is a single-stage or two-stage or even multi-stage mechanical axial sealing ring, which is close to the stationary sealed hollow shaft 1. The clean gas source hole 5 is used to pass a sealing purge gas of a certain pressure. The pressure of the sealing purge gas is greater than the internal operating pressure of the equipment, and the clean gas source can be nitrogen or air. The bearing 3 is a bearing kit. The magnetic fluid seal 4 is a single-stage or two-stage or multi-stage magnetic fluid seal, which is determined according to the specific use requirements of the equipment. The sealing ring 2 10 adopts a V-type or M-type sealing ring. When the sealing gas of a certain pressure enters the sealing cavity, a pressure difference will be formed between the inside and outside of the seal. The pressure difference will press the V-type or M-type sealing ring onto the sealed hollow shaft 1, thereby playing a sealing role.

[0030] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing device for granular polysilicon surface dust removal equipment, characterized in that: The invention comprises a sealed hollow shaft (1), wherein the outer surface of the sealed hollow shaft (1) is sleeved with an outer sleeve (2), the sealed hollow shaft (1) and the outer sleeve (2) are provided with two bearings (3), a magnetic fluid seal (4) is provided between the two bearings (3), a small amount of magnetic medium is provided inside the magnetic fluid seal (4), a clean air source hole (5) is also provided on the outer sleeve (2), both sides of the magnetic fluid seal (4) are provided with sealed outer rings (6), a sealed inner ring (7) is provided inside one of the sealed outer rings (6), and the magnetic fluid seal (4) and the sealed hollow shaft (1) are provided with a sealing inner cylinder (8), and a sealing ring 1 (9) and a sealing ring 2 (10) are provided on one side of the bearing (3), respectively. A groove is provided on the outer sleeve (2), and a sealing ring 3 (11) is provided on the groove. There are two sealing rings 3 (11). A clamping block 1 (12) is installed on one side of the outer sleeve (2) through a bolt 1, and a clamping block 2 (13) is installed on the other side of the outer sleeve (2) through a bolt 2. A sealing ring 1 (14) is provided between the clamping block 2 (13) and the sealed hollow shaft (1).

2. The sealing device for granular polysilicon surface dust removal equipment according to claim 1, characterized in that: The sealed hollow shaft (1) is made of metal material or non-metal material.

3. The sealing device for granular polysilicon surface dust removal equipment according to claim 1, characterized in that: The bearing (3) is a rolling bearing or a sliding bearing.

4. The sealing device for granular polysilicon surface dust removal equipment according to claim 1, characterized in that: The second sealing ring (10) is a V-shaped sealing ring.

5. The sealing device for granular polysilicon surface dust removal equipment according to claim 1, characterized in that: The second sealing ring (10) is an M-shaped sealing ring.

6. The sealing device for granular polysilicon surface dust removal equipment according to claim 1, characterized in that: A sealing groove 1 is provided on one side of the sealing hollow shaft (1), a sealing ring 2 (15) is provided inside the sealing groove 1, and mounting holes are provided on both the sealing hollow shaft (1) and the outer sleeve (2).

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