Sealing structure for fluidized drying bed

Abstract

The utility model discloses a kind of boiling drying bed sealing structure, belong to the technical field of boiling drying bed, including the sealing strip of being set in the outer side of relatively rotating rotating main shaft and main shaft pedestal and being worn in the compartment partition, it is characterized by: the first end of sealing strip is enclosed into the annular structure with opening in cooperation, the inside end surface of vertical fixed section is fixed in cooperation with rotating main shaft, the compensation sealing section is rotatably connected with main shaft pedestal by interference fit mode.The beneficial effects of the utility model are: the first end of plastic and flexible rubber sealing strip is enclosed into the annular structure with opening in cooperation, which realizes better sealing effect;Afterwards compensation of the compensation sealing section that is inwardly bent realizes the wear of sealing surface, to improve the purpose of the life of sealing element.

Description

Technical Field

[0001] This utility model relates to the field of fluidized bed drying technology, specifically to a fluidized bed drying sealing structure. Background Technology

[0002] Vertical automatic unloading fluidized bed dryer, also known as vertical fluidized bed dryer, is a continuous processing equipment that uses fluidization technology to efficiently dry granular and powdery materials. Its "vertical" structure refers to the fact that the main body of the equipment is a vertically arranged tower structure, which saves floor space. "Automatic unloading" means that the dried material is automatically and continuously discharged from the equipment through specific mechanisms such as rotating shafts, chamber partitions, and screw conveyors, without manual intervention, making it suitable for the continuous and automated production needs of modern industry.

[0003] The vertical fluidized bed dryer mainly consists of a drive mechanism, a rotating main shaft, chamber partitions, air chambers, steam heaters, a perforated bed plate, a main shaft base, a bed shell, and a screw conveyor. The equipment operates by having cold, dry air entering through the fresh air inlet move upwards into the air chamber, where it is heated by several steam heaters into hot, dry air. This hot air then enters the corresponding air chamber and passes through the fine holes in the perforated bed plate into the corresponding hopper, where it mixes with the granular material entering through the material inlet. This causes the material to move in a boiling state, and the moisture within the material is carried away by the hot, dry air, achieving the purpose of drying the material. Exhaust gas is discharged from the exhaust outlet at the top of the bed shell and enters the subsequent processing unit. The dried material is then discharged from the hopper via the screw conveyor.

[0004] During equipment operation, the main shaft needs to drive the compartment partition to rotate. Both the upper and lower ends of the main shaft need to be reasonably constrained to ensure the concentricity of the main shaft and the compartment. The upper end of the main shaft is constrained by the frame of the drive mechanism in conjunction with the coupling, while the lower end of the main shaft is constrained by the bearing housing.

[0005] In the existing design, the spindle and the spindle base are in a rotating fit relationship. The spindle rotates through the bearing seat inside the spindle base. However, there is a gap between the spindle and the spindle base. Material in the hopper can easily enter the gap and then leak out from the cavity inside the spindle base, causing material loss.

[0006] Currently, our company uses a sealing method consisting of an annular clamp ring and an annular PTFE plate. After drilling holes, it is bolted around the bottom of the main shaft, forming a sliding fit with the upper part of the main shaft base to achieve a seal. This sealing method has several drawbacks, including easy wear of the PTFE plate, short lifespan of parts, easy generation of foreign matter, cumbersome replacement and maintenance, and significant unsanitary areas due to the drilling positions, top planes, and protruding fixing bolts of the PTFE plate and clamp ring. Replacing the annular PTFE plate is particularly cumbersome, requiring the removal of all compartment partitions, disassembly of the annular clamp ring, and replacement of the annular seal. This results in a large workload and excessively long maintenance time, approximately 12 hours, which is unacceptable for continuous industrial production.

[0007] In summary, the existing method of sealing the bottom of the spindle by bolting together a ring-shaped clamp and a ring-shaped PTFE plate has drawbacks such as large maintenance workload, long maintenance time, short life of parts, and large unsanitary areas. Utility Model Content

[0008] To solve the above problems and overcome the shortcomings of the existing technology, this utility model provides a fluidized bed drying sealing structure; The first technical problem to be solved is that the existing method of using stainless steel rings and PTFE rings to fix the gap between the bottom of the spindle and the spindle base with bolts has defects such as large maintenance workload, long maintenance time, short life of parts, and large dead corners for cleaning.

[0009] The specific technical solution of this utility model to solve the above-mentioned technical problems is as follows: the fluidized bed sealing structure includes a sealing strip disposed on the outside of the relatively rotating main shaft and the main shaft base and passing through the chamber partition, characterized in that: the ends of the sealing strip are fitted together to form an open circular ring structure. The sealing strip includes a vertical fixing section, and an inwardly bent compensating sealing section is provided at the bottom of the vertical fixing section; the inner end face of the vertical fixing section is fixed to the rotating spindle, and the compensating sealing section is rotatably connected to the spindle base by an interference fit.

[0010] Furthermore, a groove is provided on the outer end face of the vertical fixing section, and an annular steel strip for applying a fastening force to the sealing strip is embedded in the groove.

[0011] Furthermore, the top of the vertical fixing section is provided with a sloping structure, which can reduce material accumulation and reduce unsanitary dead corners.

[0012] Furthermore, the sealing strip passes through the through hole opened in the compartment partition.

[0013] Furthermore, the sealing strip is made of rubber, such as silicone rubber or EPDM rubber.

[0014] Furthermore, the material of the annular steel strip is a metal that combines rigidity and elasticity, preferably steel, and more preferably austenitic stainless steel, such as 304 or 316.

[0015] Furthermore, the angle between the vertically fixed section and the inwardly bent compensating sealing section is 130~150°.

[0016] The beneficial effects of this utility model are: One advantage of this invention is that it provides a rubber sealing strip that is both plastic and flexible, with its ends fitting together to form an open ring structure. The rubber sealing strip is clamped by an annular steel strip that fits into the groove on the surface of the sealing strip, achieving a better sealing effect. In particular, the inwardly bent compensating sealing section generates an axial force at the bottom of the sealing ring. Because the compensating sealing section has an interference fit allowance, it compensates for wear on the sealing surface, thereby improving the life of the sealing component. One advantage of this invention is that the inclined surface at the top of the vertical fixing section and the groove of the sealing strip fit into the annular steel strip to achieve a smooth surface of the sealing strip, which can effectively reduce material accumulation and reduce sanitary dead corners.

[0017] One advantage of this invention is that it provides a sealing strip and an open-loop annular steel strip that are inserted into the through holes in the compartment partition. This eliminates the need to remove the compartment partition and the hoop, making replacement simple and easy to maintain. After adjustment, the replacement time for the seal is reduced from 12 hours to 2 hours, thus improving maintenance efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the implementation state of this utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the sealing strip structure of this utility model; In the diagram: 1. Main shaft base, 2. Compartment partition, 3. Sealing strip, 4. Rotating main shaft, 5. Clearance, 6. Through hole, 31. Vertical fixing section, 32. Compensating sealing section, 33. Annular steel strip, 34. Groove. Detailed Implementation

[0019] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "left," "right," "rear," "lower left," "upper right," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] The specific embodiment of this utility model: The fluidized bed drying sealing structure includes a sealing strip 3 disposed on the outside of the relatively rotating main shaft 4 and the main shaft base 1 and passing through the chamber partition 2. The improvement of this utility model lies in: The sealing strip 3 passes through the through hole 6 opened in the compartment partition 2; The sealing strip 3 is formed by the two ends of the sealing strip 3 to form an open ring structure. The sealing strip 3 includes a vertical fixing section 31, and the bottom of the vertical fixing section 31 is provided with an inwardly bent compensating sealing section 32. The inner end face of the vertical fixing section 31 is fixed to the rotating spindle 4, and the compensating sealing section 32 is rotatably connected to the spindle base 1 by an interference fit. The sealing strip 3 is made of rubber, preferably silicone rubber or EPDM rubber.

[0021] As another embodiment of this utility model: The outer end face of the vertical fixing section 31 is provided with a groove 34, and an annular steel strip 33 for applying a fastening force to the sealing strip 3 is embedded in the groove 34.

[0022] The material of the annular steel strip 33 is a metal that has both rigidity and elasticity. Preferably, the metal can be stainless steel, and more preferably, austenitic stainless steel, specifically 304 or 316. To balance sealing performance and service life, this invention investigated the relationship between the included angle between the vertically fixed section 31 and the inwardly bent compensating sealing section 32 and sealing performance and service life. This was determined through multiple experiments. The inclined surface at the top of the vertical fixing section 31 and the groove of the sealing strip fit into the annular steel strip to achieve a smooth surface of the sealing strip, which can effectively reduce material accumulation and reduce sanitary dead corners. The angle between the vertical fixed section 31 and the inwardly bent compensating sealing section 32 is 130~150°, which can combine excellent sealing performance and service life.

[0023] It should be noted that this utility model is a sealing structure for a fluidized bed dryer. In specific operation, 1. During installation, first insert the rubber sealing strip 3 into the through hole 6 in the compartment partition 2. Because the ends of the sealing strip 3 fit together to form an open circular structure, it has flexibility and plasticity. As long as the inner end face of the vertical fixing section 31 is fixed in conjunction with the rotating spindle 4, the gap 5 between the rotating spindle 4 and the spindle base 1 can be sealed by the interference fit between the compensating sealing section 32 and the spindle base 1. 2. In order to increase the stability of the structure, a metal strip that is both flexible and rigid can be inserted into the through hole 6 in the same way and clamped on the outer end face of the vertical fixing section 31 with a groove 34. The metal that is both rigid and elastic can be made of stainless steel, and more preferably austenitic stainless steel, specifically 304 or 316. The inner end face of the vertical fixing section 31 is fixed to the rotating spindle 4, which mainly serves a fixing function. The compensating sealing section 32 is rotatably connected to the spindle base 1 by an interference fit, which mainly serves a sealing effect. 3. During use, since the bottom of the vertical fixed section 31 is provided with an inwardly bent compensating sealing section 32, an axial force is generated at the bottom of the sealing ring. Since the compensating sealing section 32 has an interference fit allowance, it can compensate for the wear of the sealing surface and improve the service life of the sealing component.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a fluidized bed dryer, comprising a sealing strip (3) disposed on the outside of a rotating main shaft (4) and a main shaft base (1) and passing through a compartment partition (2), characterized in that: The sealing strip (3) is joined end to end to form an open circular structure. The sealing strip (3) includes a vertical fixing section (31), and the bottom of the vertical fixing section (31) is provided with an inwardly bent compensating sealing section (32); the inner end face of the vertical fixing section (31) is fixed in cooperation with the rotating spindle (4), and the compensating sealing section (32) is rotatably connected to the spindle base (1) by an interference fit.

2. The fluidized bed drying sealing structure according to claim 1, characterized in that... The outer end face of the vertical fixing section (31) is provided with a groove (34), and an annular steel strip (33) for applying a fastening force to the sealing strip (3) is embedded in the groove (34).

3. The fluidized bed drying sealing structure according to claim 2, characterized in that... The sealing strip (3) passes through the through hole (6) opened in the compartment partition (2).

4. The fluidized bed drying sealing structure according to claim 1, characterized in that... The top of the vertical fixed section is provided with a sloping structure.

5. The sealing structure of the fluidized bed dryer according to claim 1, characterized in that... The sealing strip (3) is made of rubber.

6. The fluidized bed drying sealing structure according to claim 5, characterized in that... The rubber is silicone rubber or EPDM rubber.

7. The fluidized bed drying sealing structure according to claim 2, characterized in that... The annular steel strip (33) is made of a metal that combines rigidity and elasticity.

8. The fluidized bed drying sealing structure according to claim 7, characterized in that... The metal is made of steel.

9. The fluidized bed drying sealing structure according to any one of claims 1-8, characterized in that... The angle between the vertical fixed section (31) and the inwardly bent compensation sealing section (32) is 130~150°.

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