Combined sealing device of rotary kiln

Abstract

The invention relates to the technical field of rotary kiln sealing structures, in particular to a combined sealing device of a rotary kiln. Comprising a kiln body and a kiln head / tail box, the kiln head / tail box is provided with a circular connecting hole, and one end of the kiln body is in clearance fit with the connecting hole; the sealing device is characterized in that a sealing device body is arranged at the joint of the kiln body and the kiln head / tail box, the sealing device body comprises a plurality of sealing pressing blocks which are distributed in an annular array, the sealing pressing blocks are elastically connected to the kiln head / tail box through elastic pieces, and the sealing pressing blocks elastically abut against the outer circumferential face of the kiln body. The elastic direction of the elastic piece is perpendicular to the axis of the kiln body. Ventilation grooves are formed in the middles of the sealing pressing blocks, the ventilation grooves of the multiple sealing pressing blocks are combined to form an annular groove, and an air inlet communicated with the ventilation grooves is formed in the outer portion of at least one sealing pressing block. The improvement has the advantages of being low in energy consumption, durable in sealing performance and long in service life.

Description

Technical Field

[0001] This invention relates to the field of rotary kiln sealing structure technology, and specifically to a combined sealing device for a rotary kiln. Background Technology

[0002] Rotary kilns, as important high-temperature heat treatment equipment, are widely used in metallurgy, chemical industry, building materials, environmental protection, and new materials fields for processes such as calcination, reduction, decomposition, and drying of materials. During operation, an annular gap exists at the dynamic-static connection between the rotating kiln body and the fixed kiln head or tail hood. Effectively sealing this gap is a key technical step to ensure stable operating conditions inside the kiln, improve thermal efficiency, prevent leakage of harmful gases and dust, and ensure safe production and environmental compliance.

[0003] Traditional rotary kiln sealing devices mainly rely on mechanical contact seals, such as graphite block seals, fish scale seals, or spring-compression end face seals. Among these, graphite materials are commonly used as sealing friction pairs due to their high temperature resistance, self-lubrication, and good chemical stability.

[0004] However, at high temperatures, the rotary kiln body may experience radial runout or axial movement. The graphite seals and rotating components are constantly in a state of high-speed sliding friction, leading to rapid wear of the graphite material, increased sealing gaps, and a rapid decline in sealing effectiveness. Wear of the graphite seals directly shortens their service life, requiring frequent shutdowns for replacement. This not only increases spare parts costs but also severely impacts production continuity and equipment uptime. Relying solely on physical contact with graphite is insufficient to maintain a uniform and tight fit under dynamic changes (such as kiln deformation and thermal expansion and contraction), easily leading to localized leaks. High-temperature dust can also easily penetrate the friction surface, exacerbating wear and seal failure.

[0005] Chinese patent CN111306932A discloses a rotary kiln integrated sealing structure and sealing method. Although it uses airflow sealing and graphite sealing, the two are independent of each other. The airflow cannot work together to reduce the wear of the graphite block. Independent pure airflow sealing usually requires high air source pressure and stable air flow, resulting in high energy consumption. Summary of the Invention

[0006] The technical problem to be solved by this invention is: how to improve the combined sealing structure of a rotary kiln so as to take into account the advantages of low energy consumption, long-lasting sealing performance and long service life.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A combined sealing device for a rotary kiln includes a kiln body and a kiln head / tail box. The kiln head / tail box has a circular connecting hole, and one end of the kiln body is fitted with the connecting hole with a clearance. A sealing device body is provided at the connection between the kiln body and the kiln head / tail box. The sealing device body includes multiple sealing blocks arranged in a ring array. The sealing blocks are elastically connected to the kiln head / tail box by elastic elements. The sealing blocks elastically press against the outer circumferential surface of the kiln body, and the elastic direction of the elastic elements is perpendicular to the axis of the kiln body. A venting groove is provided in the middle of the sealing blocks. The venting grooves of multiple sealing blocks are combined to form a ring groove, and at least one sealing block has an air inlet hole communicating with the venting groove on its outside.

[0008] Furthermore, in the combined sealing device structure of the rotary kiln described above, the sealing block is made of graphite.

[0009] Furthermore, in the combined sealing device structure of the rotary kiln described above, a sealing packing is pressed into the gap between two adjacent sealing blocks.

[0010] Furthermore, in the combined sealing device structure of the rotary kiln described above, the sealing packing is made of graphite packing.

[0011] Furthermore, in the combined sealing device structure of the rotary kiln described above, the end face of the kiln head / tail box is provided with multiple mounting plates arranged in a circumferential array. The elastic element includes a limiting post and a spring sleeve. The limiting post is fixedly connected to the mounting plate. The sealing block is provided with a blind hole that slides with the limiting post. The spring sleeve is sleeved on the limiting post. One end of the spring sleeve is connected to the mounting plate, and the other end of the spring sleeve is connected to the sealing block.

[0012] Furthermore, the combined sealing device structure of the rotary kiln also includes a limiting pressure plate, which is fixed to the end face of the kiln head / tail box by bolts, so that the sealing block is limited between the limiting pressure plate and the end face of the kiln head / tail box.

[0013] The beneficial effects of this invention are as follows: by setting a ventilation groove inside the sealing block, the ventilation grooves of multiple annular array sealing blocks form an annular sealing groove. When the rotary kiln rotates, air is introduced into the sealing groove through the ventilation hole to form an airflow seal. At the same time, the graphite sealing block and the outer circumference of the kiln body form a friction seal, which can produce a full synergistic effect. On the one hand, due to the effect of the graphite sealing block, compared with the airflow seal alone, only a smaller air pressure is needed to achieve a good sealing effect. Moreover, the airflow acting on the annular groove can reduce the positive pressure between the graphite sealing block and the kiln body, thereby reducing the friction between the graphite sealing block and the kiln body, thereby reducing the surface wear of the graphite sealing block, and thus greatly improving the service life of the graphite sealing block. This combines the advantages of low energy consumption, long-lasting sealing performance, and long service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a combined sealing device for a rotary kiln according to a specific embodiment of the present invention; Figure 2 This is a side view of a combined sealing device for a rotary kiln according to a specific embodiment of the present invention; Figure 3 for Figure 2 AA-direction cross-section diagram; Figure 4 This is an axial sectional view of a combined sealing device for a rotary kiln according to a specific embodiment of the present invention; Label Explanation: 1. Kiln body; 2. Kiln head / tail box; 21. Mounting plate; 3. Sealing device body; 31. Sealing block; 311. Blind hole; 32. Ventilation groove; 33. Ventilation hole; 34. Sealing packing; 35. Limiting post; 36. Spring sleeve; 4. Limiting pressure plate. Detailed Implementation

[0015] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0016] Please refer to Figures 1 to 4 This invention relates to a combined sealing device for a rotary kiln, comprising a kiln body 1 and a kiln head / tail box 2. The kiln head / tail box 2 is provided with a circular connecting hole, and one end of the kiln body 1 is fitted with the connecting hole with a gap. A sealing device body 3 is provided at the connection between the kiln body 1 and the kiln head / tail box 2. The sealing device body 3 includes a plurality of sealing blocks 31 arranged in a ring array. The sealing blocks 31 are elastically connected to the kiln head / tail box 2 by elastic elements. The sealing blocks 31 elastically press against the outer circumferential surface of the kiln body 1, and the elastic direction of the elastic elements is perpendicular to the axis of the kiln body 1. A ventilation groove 32 is provided in the middle of the sealing blocks 31. The ventilation grooves 32 of the plurality of sealing blocks 31 are combined to form a ring groove, wherein at least one sealing block 31 is provided with an air inlet hole communicating with the ventilation groove 32.

[0017] In a preferred embodiment, the sealing block 31 is made of graphite.

[0018] In the above embodiments, by setting a ventilation groove 32 inside the sealing block 31, the ventilation grooves 32 of multiple annular array sealing blocks 31 form an annular sealing groove. When the rotary kiln body 1 rotates, air is vented into the sealing groove through the ventilation hole 33 to form an airflow seal. At the same time, the graphite sealing block 31 forms a friction seal with the outer circumference of the kiln body 1, which can produce a full synergistic effect. On the one hand, due to the effect of the graphite sealing block 31, compared with the airflow seal alone, only a smaller air pressure is needed to achieve a good sealing effect. Moreover, the airflow acting on the annular groove can reduce the positive pressure between the graphite sealing block 31 and the kiln body 1, thereby reducing the friction between the graphite sealing block 31 and the kiln body 1, thereby reducing the surface wear of the graphite sealing block 31, and thus greatly improving the service life of the graphite sealing block 31. This combines the advantages of low energy consumption, long-lasting sealing performance, and long service life.

[0019] In a preferred embodiment, a sealing packing 34 is pressed into the gap between two adjacent sealing blocks 31.

[0020] Preferably, the sealing packing 34 is made of graphite packing.

[0021] In the above embodiments, the graphite sealing packing 34 serves as a sealing element between two adjacent sealing blocks 31.

[0022] In a preferred embodiment, the end face of the kiln head / tail box 2 is provided with a plurality of mounting plates 21 arranged in a circumferential array. The elastic element includes a limiting post 35 and a spring sleeve 36. The limiting post 35 is fixedly connected to the mounting plate 21. The sealing block 31 is provided with a blind hole 311 that slides with the limiting post 35. The spring sleeve 36 is sleeved on the limiting post 35. One end of the spring sleeve 36 is connected to the mounting plate 21, and the other end of the spring sleeve 36 is connected to the sealing block 31.

[0023] In the above embodiments, the limiting post 35 and the blind hole 311 limit the graphite sealing block 31 so that it can be more stably pressed radially against the outer circumferential surface of the kiln body 1.

[0024] As a preferred embodiment, it also includes a limiting pressure plate 4, which is fixed to the end face of the kiln head / tail box 2 by bolts, so that the sealing pressure block 31 is limited between the limiting pressure plate 4 and the end face of the kiln head / tail box 2.

[0025] In the above embodiments, by designing the limiting pressure plate 4, the sealing block 31 can be stably limited between the limiting pressure plate 4 and the end face of the kiln head / tail box 2, thereby improving the stability of the sealing structure.

[0026] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A combined sealing device for a rotary kiln, comprising a kiln body and a kiln head / tail box, wherein the kiln head / tail box is provided with a circular connecting hole, and one end of the kiln body is loosely fitted into the connecting hole; characterized in that, A sealing device body is provided at the connection between the kiln body and the kiln head / tail box. The sealing device body includes multiple sealing blocks arranged in a ring array. The sealing blocks are elastically connected to the kiln head / tail box by elastic elements. The sealing blocks are elastically pressed against the outer circumferential surface of the kiln body. The elastic direction of the elastic elements is perpendicular to the axis of the kiln body. A ventilation groove is provided in the middle of the sealing blocks. The ventilation grooves of multiple sealing blocks are combined to form a ring groove. At least one sealing block has an air inlet hole communicating with the ventilation groove on its outside.

2. The combined sealing device for a rotary kiln according to claim 1, characterized in that, The sealing block is made of graphite.

3. The combined sealing device for a rotary kiln according to claim 1, characterized in that, A sealing packing is pressed into the gap between two adjacent sealing blocks.

4. The combined sealing device for a rotary kiln according to claim 3, characterized in that, The sealing packing is made of graphite packing.

5. The combined sealing device for a rotary kiln according to claim 1, characterized in that, The end face of the kiln head / tail box is provided with multiple mounting plates arranged in a circumferential array. The elastic element includes a limiting post and a spring sleeve. The limiting post is fixedly connected to the mounting plate. The sealing block is provided with a blind hole that slides with the limiting post. The spring sleeve is sleeved on the limiting post. One end of the spring sleeve is connected to the mounting plate, and the other end of the spring sleeve is connected to the sealing block.

6. The combined sealing device for a rotary kiln according to claim 1, characterized in that, It also includes a limiting pressure plate, which is fixed to the end face of the kiln head / tail box by bolts, so that the sealing pressure block is limited between the limiting pressure plate and the end face of the kiln head / tail box.

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