Composite sealing structure of main shaft

Abstract

The utility model provides a composite sealing structure of a main shaft, which is applied to the technical field of sealing of the main shaft of a scraper discharging centrifugal machine and is characterized by comprising a machine body, the main shaft arranged in the machine body and a rotary drum fixed on the main shaft, the machine body is rotationally connected with the main shaft through a main bearing; the bearing frame is fixed on the machine body; the main bearing is clamped on the bearing frame; a first sealing piece with one end in sealed connection with the rotary drum is fixed to the bearing frame, a third sealing assembly is fixedly arranged on the bearing frame, and a second sealing piece enabling the main shaft to be in sealed connection with the rotary drum is fixed to the main shaft. A sealing cavity is formed among the bearing frame, the main shaft and the rotary drum through sealing of the first sealing piece, the second sealing piece and the third sealing piece, and an air inlet channel with one end communicated with the sealing cavity is formed in the bearing frame; the composite sealing structure has the technical effects that composite sealing is realized, so that acid gas, liquid or dust materials are effectively prevented from entering the main bearing, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of the main shaft seal of a scraper discharge centrifuge, in particular to a main shaft composite seal structure. Background Art

[0002] The scraper discharge centrifuge can automatically realize processes such as feeding, separation, washing, dehydration, liquid discharge, discharging, and screen washing under full speed operation; it has the characteristics of novel structure, stable operation, high automation degree, low labor intensity, large production capacity, good washing effect, and low moisture content of the filter cake; it is suitable for separating suspensions with solid phase particle sizes greater than 0.015 mm and concentration ranges of 25 - 60%; it is applicable to industries such as chemical industry, food, and pharmaceuticals, such as the solid-liquid separation in the processing of starch, citric acid, amino acids, etc.; the scraper discharge centrifuge is driven by a main motor to rotate the inner and outer drums sleeved at full speed. The material is introduced into the drum through the feed pipe. Under the action of centrifugal force, the liquid phase passes through the filter cloth and the filter holes in the inner drum wall and discharges from the inner drum, gathering in the gap between the inner and outer drums, passing through the through holes to the siphon chamber, and then being pumped away by the siphon device and discharged outside the machine; the solid phase is intercepted in the inner drum to form an annular filter cake layer; after the feeding reaches the predetermined volume, the feeding stops and further separation is carried out. At this time, washing can be carried out; after the washing and separation are completed, the scraper rotates automatically, scrapes off the solid phase and discharges it outside the machine through the conveying screw, and then automatically washes the screen to start the next cycle currently.

[0003] However, during the operation of the scraper discharge centrifuge, there are a large number of acidic gases, liquids, and dust materials, etc. Due to the unreasonable structure of the main shaft seal of the existing scraper discharge centrifuge, the seal fails; external substances (acidic gases, liquids, and dust materials) easily flow out from the blanking hole at the bottom of the drum and enter the main bearing through the gap between the drum and the machine body, thereby causing damage to the main bearing, resulting in failures of the scraper discharge centrifuge, and seriously causing major safety accidents and economic losses. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a main shaft composite seal structure, and its advantage is to achieve composite sealing, thereby effectively preventing acidic gases, liquids, or dust materials from entering the main bearing, and extending the service life of the bearing.

[0005] To achieve the above purpose and other related purposes, the utility model provides the following technical solutions:

[0006] A main shaft composite sealing structure includes a machine body, a main shaft disposed within the machine body, and a drum fixed to the main shaft; the machine body is rotatably connected to the main shaft through a main bearing; it further includes a bearing bracket fixed to the machine body, and the main bearing is snap-fitted on the bearing bracket; a first sealing member with one end sealingly connected to the drum is fixed on the bearing bracket, a third sealing assembly for sealingly connecting the bearing bracket and the main shaft is fixedly arranged on the bearing bracket, and a second sealing member for sealingly connecting the main shaft and the drum is fixed on the main shaft.

[0007] The sealing of the first sealing member, the second sealing member, and the third sealing assembly forms a sealing cavity between the bearing bracket, the main shaft, and the drum, and an air inlet passage with one end communicating with the sealing cavity is opened on the bearing bracket.

[0008] Through the above technical solution, the bearing bracket is used to carry the bearing; the first sealing member is sealingly connected to the drum to achieve the first sealing, thereby preventing a large amount of corrosive gases, liquids, or dust from entering the sealing cavity; the air inlet passage is connected to an external gas source device so that gas enters the sealing cavity through the air inlet passage, forming a positive pressure in the sealing cavity to achieve the second sealing, and further preventing corrosive gases, liquids, or dust from entering the sealing cavity through the gap between the first sealing member and the drum; the third sealing assembly is used to sealingly connect the bearing bracket and the main shaft to achieve the third sealing, that is, even if external substances enter the sealing cavity, the third sealing assembly can prevent the external substances from entering the main bearing; thus, composite sealing is achieved, which can completely prevent corrosive gases, liquids, or dust materials from entering the main bearing, greatly prolong the service life of the main bearing, reduce the failure probability of the centrifuge, and greatly improve the long-term stable operation of the centrifuge; at the same time, the composite sealing structure is simple, reducing the centrifuge maintenance cost for customers.

[0009] In an embodiment of the present invention, the bearing bracket includes a bearing seat fixed to the machine body and a bearing gland fixed to the bearing seat;

[0010] The main bearing is snap-fitted between the bearing seat and the bearing gland.

[0011] Through the above technical solution, the bearing seat and the bearing gland are used to limit the main bearing.

[0012] In an embodiment of the present invention, the first sealing member is a labyrinth ring fixed to the bearing gland;

[0013] A groove sealingly connected to the labyrinth ring is provided on the drum on the side opposite to the labyrinth ring.

[0014] Through the above technical solution, the labyrinth ring is sealingly connected to the groove provided on one side of the drum, thereby achieving the first sealing and preventing a large amount of corrosive gases, liquids, and dust from entering the sealing cavity.

[0015] In an embodiment of the present utility model, the third sealing assembly includes a lip seal fixed on the bearing gland and a wear-resistant ring sleeved on the main shaft, and the lip seal is sealingly connected to the wear-resistant ring.

[0016] Through the above technical solution, the lip seal is sealingly connected to the wear-resistant ring to achieve the third seal, thereby preventing corrosive gases, liquids or dust materials entering the sealing cavity from entering the main bearing.

[0017] In an embodiment of the present utility model, the second seal is an O-ring sleeved on the main shaft, and the O-ring is located between the wear-resistant ring and the drum.

[0018] Through the above technical solution, the O-ring is used to achieve the sealing connection between the main shaft and the drum; and when air enters the sealing cavity, it can prevent the sealing cavity from leaking air between the main shaft and the drum.

[0019] In an embodiment of the present utility model, a quick-connect joint communicating with the air inlet channel is fixedly arranged at the bottom of the bearing housing.

[0020] Through the above technical solution, the quick-connect joint facilitates the quick connection of the air inlet channel to an external gas source device.

[0021] In an embodiment of the present utility model, the air inlet channel includes a first air passage arranged on the bearing housing and a second air passage arranged on the bearing gland and communicating with the first air passage;

[0022] A third air passage with one end communicating with the second air passage and the other end communicating with the sealing cavity is arranged on the labyrinth ring close to the sealing cavity side.

[0023] Through the above technical solution, the sealing cavity is located between the first seal and the third sealing assembly; when air is introduced into the sealing cavity through the air inlet channel, a positive pressure is formed in the sealing cavity, thereby achieving the second seal; preventing a large amount of corrosive gases, liquids and dust from entering the sealing cavity;

[0024] And since the sealing cavity is sealed by the O-ring, the lip seal and the wear-resistant ring; the most easily air-leaking end of the sealing cavity is the labyrinth ring side; when the air flow is discharged through one side of the labyrinth ring, it can effectively prevent external substances from entering the sealing cavity and effectively achieve the sealing effect of the main bearing.

[0025] As described above, the main shaft composite sealing structure of the present utility model has the following beneficial effects:

[0026] The labyrinth ring is sealingly connected to the groove provided on one side of the drum, thus achieving the first seal; the sealing cavity is located between the first seal and the third seal assembly; when air is introduced into the sealing cavity through the air inlet channel, a positive pressure is formed in the sealing cavity, thereby achieving the second seal; the lip seal is sealingly connected to the wear-resistant ring to achieve the third seal; furthermore, a composite seal is achieved, which can completely prevent corrosive gases, liquids or dust materials from entering the main bearing, greatly extending the service life of the main bearing, reducing the failure probability of the centrifuge, and greatly improving the long-term stable operation of the centrifuge; at the same time, the composite seal structure is simple, reducing the maintenance cost of the centrifuge for customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of the overall structure of an embodiment of the present invention;

[0028] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0029] Reference numerals: 1, body; 2, main shaft; 3, drum; 4, main bearing; 5, bearing bracket; 51, bearing seat; 52, bearing gland; 8, installation groove; 9, labyrinth ring; 10, groove; 11, lip seal; 12, wear-resistant ring; 13, fixing groove; 14, O-ring; 15, sealing cavity; 16, quick-connect fitting; 17, first air passage; 18, second air passage; 19, third air passage. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0031] Please refer to Figures 1 to 2 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical essential meanings. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope within which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0032] Please refer to Figure 1 and Figure 2, the utility model provides a main shaft composite sealing structure, which includes a machine body 1, a main shaft 2, a drum 3, a main bearing 4 and a bearing bracket 5;

[0033] The bearing bracket 5 is arranged in the machine body 1 and fixed on the machine body 1; the bearing bracket 5 includes a bearing seat 51 bolted to the machine body 1 and a bearing gland 52 bolted to the bearing seat 51; an installation groove 8 is arranged on the bearing seat 51, the main bearing 4 is installed in the installation groove 8, and the bearing gland 52 is pressed on the main bearing 4 to limit the main bearing 4; the main shaft 2 is inserted into the main bearing 4, and the drum 3 is bolted to the main shaft 2;

[0034] A first sealing member whose one end is hermetically connected to the drum 3 is fixed to the upper end of the bearing gland 52; the first sealing member in this embodiment is a labyrinth ring 9, and the labyrinth ring 9 is made of polytetrafluoroethylene, which has the characteristics of high temperature resistance and corrosion resistance, and avoids generating sparks, abnormal machine noises and increased vibrations due to metal interference; the labyrinth ring 9 is sleeved outside the main shaft 2, and a groove 10 hermetically connected to the labyrinth ring 9 is arranged on the drum 3 on the side opposite to the labyrinth ring 9, so as to achieve the first sealing.

[0035] Please refer to Figure 1 and Figure 2 A third sealing assembly for hermetically connecting the bearing bracket 5 and the main shaft 2 is fixedly arranged on the bearing bracket 5. The third sealing assembly includes a lip seal ring 11 and a wear-resistant ring 12. The lip seal ring is made of fluororubber with high temperature resistance and corrosion resistance or a higher-grade material; the wear-resistant ring 12 has a surface thermally plated with a chromium oxide wear-resistant layer, with a hardness of up to 70-76HRC and a surface roughness Ra0.8, ensuring reliable lip sealing and extending the service life; the wear-resistant ring 12 is fixedly sleeved on the main shaft 2; the lip seal ring 11 is sleeved outside the wear-resistant ring, and a fixing groove 13 is arranged on the side wall of the bearing gland 52, and the lip seal ring 11 is fixed in the fixing groove 13. The bottom of the labyrinth ring 9 abuts against the top of the lip seal ring 11 and further restricts the lip seal ring 11 on the bearing gland 52; the lip seal ring 11 is hermetically connected to the wear-resistant ring 12 to achieve the third sealing.

[0036] Please refer to Figure 1 and Figure 2 A second sealing member for hermetically connecting the main shaft 2 and the drum 3 is fixed on the main shaft 2. The second sealing member in this embodiment is an O-ring 14 fixedly sleeved on the main shaft 2. The O-ring 14 is located between the wear-resistant ring 12 and the drum 3, and the top of the O-ring 14 abuts against the drum 3 and the bottom abuts against the wear-resistant ring 12; the O-ring 14 is used to achieve the hermetic connection between the main shaft 2 and the drum 3.

[0037] Please refer to Figure 1 and Figure 2, due to the sealing of the first seal, the second seal and the third seal assembly, a sealed cavity 15 is formed between the bearing housing 5, the main shaft 2 and the drum 3. An air inlet passage is provided on the bearing housing 5, one end of which communicates with the sealed cavity 15 and the other end is connected to an external gas source device. When air is introduced into the sealed cavity 15 through the air inlet passage, a positive pressure is formed in the sealed cavity 15, thereby realizing the second seal; preventing a large amount of corrosive gases, liquids and dust from entering the sealed cavity 15;

[0038] And since the sealed cavity 15 is sealed by the O-ring 14, the lip seal 11 and the wear-resistant ring 12; the most easily air-leaking end of the sealed cavity 15 is the side of the labyrinth ring 9. When the air flow is discharged through one side of the labyrinth ring 9, it can effectively prevent external substances from entering the sealed cavity 15, effectively realizing the sealing effect of the main bearing 4.

[0039] Please refer to Figure 1 and Figure 2 , the air inlet passage includes a first air passage 17 provided on the bearing seat 51 and a second air passage 18 provided on the bearing gland 52 and communicating with the first air passage 17; a third air passage 19 is provided on the labyrinth ring 9 close to the sealed cavity 15, one end of which communicates with the second air passage 18 and the other end communicates with the sealed cavity 15;

[0040] A quick-connect joint 16 communicating with the first air passage 17 is fixedly provided at the bottom of the bearing seat 51; the quick-connect joint 16 facilitates the quick connection of the air inlet passage with an external gas source device; the gas can be compressed air or inert gas.

[0041] Brief description of the installation process: First, bolt the bearing seat 51 to the machine body 1, install the main bearing 4 in the installation groove 8, then cover the bearing gland 52 on the bearing seat 51 and press it on the main bearing 4, install the lip seal 11 in the fixing groove 13, fix the labyrinth ring on the top of the bearing gland 52 and press part of the labyrinth ring on the lip seal 11; then sequentially sleeved the wear-resistant ring and the O-ring 14 on the main shaft 2, insert the main shaft 2 into the main bearing 4, and make the lip seal 11 sleeved on the wear-resistant ring and sealed with the wear-resistant ring; finally, sleeve the drum 3 on the main shaft 2, make the groove 10 abut against the labyrinth ring 9, and after the inner wall of the drum 3 abuts against the O-ring 14, fix the drum 3 on the main shaft 2.

[0042] In summary, the utility model realizes composite sealing, can completely prevent corrosive gases, liquids or dust materials from entering the main bearing 4, greatly prolongs the service life of the main bearing 4, reduces the failure probability of the centrifuge, and greatly improves the long-term stable operation of the centrifuge; at the same time, the composite sealing structure is simple, reducing the maintenance cost of the centrifuge for customers. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0043] The above embodiments are only illustrative of the principles and effects of the present utility model, and are not intended to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A main shaft composite sealing structure, comprising a body (1), a main shaft (2) disposed in the body (1), and a rotating drum (3) fixed on the main shaft (2); the body (1) and the main shaft (2) are rotatably connected via a main bearing (4); and characterized in that: It also comprises a bearing frame (5) fixed on the machine body (1), the main bearing (4) being clamped on the bearing frame (5); a first sealing member having one end sealedly connected to the drum (3) is fixed on the bearing frame (5); a third sealing assembly is fixedly arranged on the bearing frame (5) for sealingly connecting the bearing frame (5) and the main shaft (2); and a second sealing member is fixedly arranged on the main shaft (2) for sealingly connecting the main shaft (2) and the drum (3); The seals of the first seal, the second seal and the third seal assembly form a sealing cavity (15) between the bearing frame (5), the main shaft (2) and the drum (3); the bearing frame (5) is provided with an air inlet passage with one end connected to the sealing cavity (15).

2. The main shaft composite sealing structure according to claim 1, characterized in that: The bearing frame (5) comprises a bearing seat (51) fixed on the machine body (1) and a bearing gland (52) fixed on the bearing seat (51); The main bearing (4) is clamped between the bearing seat (51) and the bearing cover (52).

3. The main shaft composite sealing structure according to claim 2 is characterized in that: The first sealing member is a labyrinth ring (9) fixed on the bearing gland (52); A groove (10) which is sealingly connected to the labyrinth ring (9) is arranged on the rotating drum (3) on the side opposite to the labyrinth ring (9).

4. The main shaft composite sealing structure according to claim 2, characterized in that: The third sealing assembly comprises a lip seal ring (11) fixed on the bearing cover (52) and a wear-resistant ring (12) sleeved on the main shaft (2); the lip seal ring (11) is sealingly connected to the wear-resistant ring (12).

5. The main shaft composite sealing structure according to claim 4 is characterized in that: The second sealing member is an O-ring (14) sleeved on the main shaft (2), and the O-ring (14) is located between the wear-resistant ring (12) and the drum (3).

6. The main shaft composite sealing structure according to claim 2, characterized in that: A quick-connect joint (16) communicating with the air intake passage is fixedly arranged at the bottom of the bearing seat (51).

7. The main shaft composite sealing structure according to claim 6, characterized in that: The air inlet passage comprises a first air passage (17) arranged on the bearing seat (51) and a second air passage (18) arranged on the bearing gland (52) and communicating with the first air passage (17); A third air passage (19) is provided on the labyrinth ring (9) close to one side of the sealing chamber (15), one end of the third air passage being in communication with the second air passage (18) and the other end of the third air passage being in communication with the sealing chamber (15).

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