A sealing structure of a shaft end of a conditioner

Abstract

The utility model discloses a sealing structure of conditioner shaft end, including the shaft hole of conditioner end cover board and wear -resisting cover of the shaft that goes out, and wear -resisting cover is encased in the wear -resisting cover on the seat of sealing, and wear -resisting cover outer wall and sealing seat inner wall are equipped with first sealing packing, seal liquid ring and second sealing packing, and the shaft has the labyrinth seal spare. In this way, the labyrinth seal spare is first -class seal, and the centrifugal force is produced when the shaft rotates through its tortuous flow channel, and the powder particle in the flow channel is thrown back to the conditioner. First sealing packing is as second -class seal, and the contact type seal is formed to wear -resisting cover, and the further penetration of steam and trace powder is blocked. And seal liquid ring is three -class seal, and the liquid film sealing layer is formed through the injection of the grease or sealing liquid, and the tiny gap of first sealing packing is filled, and the sealed sealing property is further promoted, and second sealing packing is as four -class seal, and the liquid leakage of seal liquid ring and the few powder that penetrate are blocked.

Description

Technical Field

[0001] This utility model relates to the field of conditioners, specifically to a sealing structure at the shaft end of a conditioner. Background Technology

[0002] Conditioners are key pieces of equipment in the production processes of the food, feed, and grain and oil industries. Powdered materials are thoroughly agitated by paddles on the conditioning shaft within the conditioner, then treated with steam before being fed into downstream equipment such as extruders or pellet mills for extrusion processing. During the conditioning process, the conditioner requires a high level of sealing; leakage of material or air is unacceptable. However, existing conditioner shaft end seals generally use a single-packing structure, which frequently leads to material or water leakage at the shaft end during production. This reduces the service life of the shaft end bearings, affects workshop cleanliness and hygiene, and the packing is prone to wear, requiring frequent replacement. Utility Model Content

[0003] Based on this, and in response to the aforementioned technical problems, this utility model provides a sealing structure for the end of a conditioner shaft.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A sealing structure for the shaft end of a conditioner includes a rotating shaft passing through a shaft hole in the end cover plate of the conditioner, and a wear-resistant sleeve fixed on the rotating shaft for sealing the gap between the rotating shaft and the shaft hole. A sealing seat located outside the end cover plate is fitted on the wear-resistant sleeve. A first sealing packing is pressed between the outer wall of the wear-resistant sleeve and the inner wall of the sealing seat. The structure also includes a labyrinth seal fitted on the rotating shaft and located inside the end cover plate. A sealing ring and a second sealing packing are sequentially provided between the outer wall of the wear-resistant sleeve and the inner wall of the sealing seat, and outside the first sealing packing. The injection nozzle of the sealing ring extends from the round hole of the sealing seat.

[0006] The above technical solution utilizes a labyrinth seal as the first-stage seal on the inner side of the end cover plate. The labyrinth seal's tortuous flow channel generates centrifugal force during shaft rotation, re-throwing most of the powder particles entering the channel back into the pressurizer. Simultaneously, the flow channel's throttling effect reduces steam pressure and velocity, preventing large amounts of powder and steam from directly impacting the subsequent first-stage sealing packing and delaying its wear. The first-stage sealing packing serves as the second-stage seal, protecting against powder seeping through the labyrinth seal. By being pressed tightly against the outer wall of the wear-resistant sleeve and the outer surface of the end cover plate, a contact seal is formed, preventing further penetration of steam and trace amounts of powder. The sealing ring, as the third-level seal, can periodically inject grease or sealing fluid through the exposed injection nozzle to form a liquid film sealing layer, filling the tiny gaps in the first sealing packing and further improving the sealing performance. At the same time, the grease or sealing fluid injected into the sealing ring can lubricate the first and second sealing packings, reducing friction and wear between the packings and the wear-resistant sleeve. Compared with a single sealing packing, this extends the replacement cycle and improves the service life of the first and second sealing packings. The second sealing packing, as the fourth-level seal, prevents liquid leakage from the sealing ring and a very small amount of powder that penetrates.

[0007] In a specific embodiment of this utility model: the first sealing filler and the second sealing filler are made of graphite or asbestos.

[0008] In a specific embodiment of this utility model: the outer end face of the sealing seat is provided with a pressure cap for pressing the outer side of the second sealing packing. The pressure cap is fixed to the sealing seat by a first bolt, and the sealing seat is fixed to the end cover plate by a second bolt.

[0009] In a specific embodiment of this utility model: the labyrinth seal is fixed to the rotating shaft by a set screw.

[0010] In a specific embodiment of this utility model: the outer side of the end cover plate is also provided with a bearing seat for fixing and supporting the rotating shaft.

[0011] In summary, this utility model adopts a four-level sealing structure, with each level of sealing sequentially connected, thereby achieving complete blockage of powder and steam. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the sealing structure at the shaft end of a conditioner according to the present invention;

[0014] Figure 2 yes Figure 1 Enlarged view of point A in the middle. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0016] Please see Figure 1 and Figure 2 As shown, this utility model is a sealing structure for the shaft end of a conditioner, including a rotating shaft 12 passing through the shaft hole 11 of the end cover plate 10 of the conditioner, and a wear-resistant sleeve 13 fixed on the rotating shaft 12 to seal the gap between the rotating shaft 12 and the shaft hole 11. Here, the wear-resistant sleeve 13 can be expanded by heating it first. After being fitted into the preset assembly position on the rotating shaft 12, the shrinkage characteristics of the wear-resistant sleeve 13 after cooling form an interference fit with the rotating shaft 12, thereby achieving a firm fixation between the two. A sealing seat 14 located outside the end cover plate 10 is fitted on the wear-resistant sleeve 13. A first sealing filler 15 is pressed between the outer wall of the wear-resistant sleeve 13 and the inner wall of the sealing seat 14. In addition, a labyrinth seal 16 is also included, fitted on the rotating shaft 12 and located inside the end cover plate 10. A sealing liquid ring 17 and a second sealing filler 18 are also sequentially provided between the outer wall of the wear-resistant sleeve 13 and the inner wall of the sealing seat 14 and outside the first sealing filler 15. The injection nozzle 171 of the sealing ring 17 extends from the round hole 141 of the sealing seat 14.

[0017] Thus, a labyrinth seal 16 is installed on the inner side of the end cover plate 10 as a first-stage seal. The labyrinth seal's tortuous flow channel generates centrifugal force during shaft rotation, throwing most of the powder particles entering the flow channel back into the pressurizer. Simultaneously, the flow channel's throttling effect reduces steam pressure and velocity, preventing a large amount of powder and steam from directly impacting the subsequent first sealing packing 15, thus delaying its wear. The labyrinth seal 16 can be fixed to the shaft 12 by set screws 161. The first sealing packing 15 serves as a second-stage seal, protecting against powder seeping through the labyrinth seal 16. The first sealing packing 15 is pressed tightly against the outer wall of the wear-resistant sleeve 13 and the outer surface of the end cover plate 10, forming a contact seal and preventing further penetration of steam and trace amounts of powder. The sealing ring 17 is the third-level seal. Lubricating grease or sealing fluid can be periodically injected through the exposed injection nozzle 171 to form a liquid film sealing layer, which fills the tiny gaps in the first sealing packing and further improves the sealing performance. At the same time, the lubricating grease or sealing fluid injected into the sealing ring can lubricate the first and second sealing packings, reduce the friction and wear between the packings and the wear-resistant sleeve, extend the replacement cycle compared to a single sealing packing, and improve the service life of the first and second sealing packings. The second sealing packing 18 serves as the fourth-level seal, preventing liquid leakage from the sealing ring and a very small amount of powder that penetrates.

[0018] In this embodiment, the first sealing filler 15 and the second sealing filler 18 can be made of graphite or asbestos.

[0019] In this embodiment, the outer end face of the sealing seat 14 is provided with a pressure cap 19 for pressing the outer side of the second sealing packing 18. The pressure cap 19 is fixed to the sealing seat 14 by a first bolt 201. The sealing seat 14 is fixed to the outer side of the end cover plate 10 by a second bolt 202.

[0020] A bearing seat 9 for fixing and supporting the rotating shaft 12 is also provided on the outside of the end cover plate 10.

[0021] In summary, this utility model adopts a four-level sealing structure, with each level of sealing sequentially connected, thereby achieving complete blockage of powder and steam.

[0022] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A sealing structure for the shaft end of a conditioner, comprising a rotating shaft passing through a shaft hole in an end cover plate of the conditioner, and a wear-resistant sleeve fitted onto the rotating shaft for sealing the gap between the rotating shaft and the shaft hole, wherein a sealing seat located outside the end cover plate is fitted onto the wear-resistant sleeve, and a first sealing filler is pressed between the outer wall of the wear-resistant sleeve and the inner wall of the sealing seat, characterized in that, It also includes a labyrinth seal sleeved on the rotating shaft and located inside the end cover plate. Between the outer wall of the wear-resistant sleeve and the inner wall of the sealing seat, and outside the first sealing packing, a sealing ring and a second sealing packing are provided in sequence. The injection nozzle of the sealing ring extends out from the round hole of the sealing seat.

2. The sealing structure at the end of the conditioner shaft according to claim 1, characterized in that, The first and second sealing packings are made of graphite or asbestos.

3. The sealing structure at the end of the conditioner shaft according to claim 1, characterized in that, The outer end face of the sealing seat is provided with a pressure cap for pressing the outer side of the second sealing packing. The pressure cap is fixed to the sealing seat by a first bolt, and the sealing seat is fixed to the end cover plate by a second bolt.

4. The sealing structure at the end of the conditioner shaft according to claim 1, characterized in that, The labyrinth seal is fixed to the shaft by set screws.

5. The sealing structure at the end of the conditioner shaft according to claim 1, characterized in that, The end cover plate is also provided with a bearing seat for fixing and supporting the rotating shaft.

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