Sealing structure for hot air box of coal mill

Abstract

The utility model discloses a coal mill hot air box sealing structure which comprises a hot air box and a stranding cage shaft, a sealing ring is installed at the connecting position of the hot air box and the stranding cage shaft, the sealing ring is hollow, a first sealing groove and a second sealing groove which are isolated from each other are formed in the sealing ring, and a packing and a framework seal are installed in the sealing ring respectively and can be detached and replaced. Framework sealing enhances leakproofness, double-sealing cooperative work effectively prevents hot air leakage, reduces energy loss and improves heat efficiency, a sealing disc in a sealing ring divides the sealing ring into an upper sealing structure and a lower sealing structure, overall sealing reliability is enhanced, good sealing performance prevents hot air and dust from entering key parts, and the service life of equipment is prolonged. Due to the detachable design of the sealing element, quick replacement is facilitated, the downtime is shortened, the production efficiency is improved, meanwhile, the maintenance difficulty and cost are reduced, and stable and safe operation of the coal mill is ensured.

Description

Technical Field

[0001] The utility model relates to the field of hot air box sealing, in particular to a hot air box sealing structure for a coal mill. Background Art

[0002] Coal mills are crucial equipment in the industrial sector, particularly in thermal power plants and cement plants. Their primary function is to grind raw coal into pulverized coal to meet the demands of subsequent production processes. For example, in a thermal power plant, pulverized coal is transported as fuel to the boiler for combustion, generating steam that drives the turbine to generate electricity. The proper operation of a coal mill plays a key role in the stability and efficiency of the entire production system, and the performance of its components, including the sealing structure, directly affects the overall operation of the coal mill.

[0003] In the existing technology, the hot air box of the coal mill adopts a simple contact seal, but this sealing method is easy to wear out during long-term operation, the sealing effect is not ideal, and it needs to be replaced frequently, which increases maintenance costs. As the packing wears, the leakage of hot air increases, and ash leakage and oil leakage from the bearing seat gradually appear, causing the temperature of the cage bearing seat to be high, the internal lubricating oil to liquefy at high temperature, and the bearing to be damaged due to lack of lubrication, affecting the safe and stable operation of the system equipment.

[0004] Therefore, it is necessary to propose a coal mill hot air box sealing structure to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a hot air box sealing structure for a coal mill to solve the problems of contact seals being easily worn during long-term operation, resulting in unsatisfactory sealing effects, packing wear, increased hot air leakage, and high-temperature liquefaction of the internal lubricating oil.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A coal mill hot air box sealing structure includes a hot air box, a cage shaft is passed through the hot air box, and a sealing ring is installed at the connection between the cage shaft and the hot air box. The sealing ring is connected to the cage shaft, and the interior of the sealing ring is a hollow structure. A sealing groove 1 and a sealing groove 2 are provided inside the sealing ring, and the sealing groove 1 and the sealing groove 2 are isolated from each other. A packing is installed inside the sealing groove 1, and a skeleton seal is installed inside the sealing groove 2. The packing and skeleton seals on the sealing groove 1 and the sealing groove 2 are removable and replaceable.

[0008] Preferably, a sealing disk is installed in the center of the sealing ring, and the sealing disk separates the sealing ring into two upper and lower sealing structures. The sealing groove 1 and the sealing groove 2 are located in the upper sealing structure.

[0009] Preferably, four clamping blocks are installed on the inner wall of the sealing ring, and the clamping blocks are evenly distributed on the sealing ring.

[0010] Preferably, the sealing disk is mounted on the sealing ring through a clamping block, the sealing disk is tightly fitted to the inner wall of the sealing ring, a sealing rubber ring is provided between the sealing disk and the inner wall of the sealing ring, and the sealing rubber ring is fixedly mounted on the sealing disk.

[0011] Preferably, a gap is provided at the connection between the stranding cage shaft and the hot air box.

[0012] Preferably, a gap sealing disk is connected to the inner side of the sealing ring close to the hot air box, one side of the gap sealing disk is tightly fitted with the gap on the hot air box, and a mounting groove is provided on the gap sealing disk, and a packing is installed on the mounting groove.

[0013] The technical effects and advantages of this utility model are:

[0014] 1. In the double sealing design, the packing and the skeleton seal work together. The packing provides the initial seal, while the skeleton seal enhances the tightness, effectively preventing hot air leakage, reducing energy loss during the operation of the coal mill, and improving the thermal efficiency of the system. At the same time, the sealing disc separates the sealing ring into two sealing structures, the upper and lower parts, further enhancing the reliability of the overall seal. Even if there is a problem with the upper sealing structure, it can effectively prevent the further penetration of hot air and dust, ensuring the sealing effect.

[0015] 2. Good sealing performance prevents hot air and dust from entering key parts such as the cage shaft bearings, avoiding damage to the bearings due to lack of oil after the high-temperature liquefaction of the lubricating oil due to hot air leakage, and dust from wearing and corroding the internal parts of the equipment. This extends the service life of the bearings and the entire coal mill equipment, and reduces the maintenance and replacement costs of the equipment;

[0016] 3. The packing and skeleton seal on the sealing groove 1 and sealing groove 2 are removable and replaceable. The operator can quickly and easily replace the damaged seals, shortening the equipment downtime for maintenance and improving production efficiency. At the same time, the removable design of the packing on the gap sealing disk also facilitates the sealing maintenance of the gap between the stranding cage shaft and the hot air box, further reducing the maintenance difficulty and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the sealing structure of the hot air box of a coal mill according to the present utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of the sealing ring of the utility model.

[0019] Figure 3 This is a schematic diagram of the structure of the gap sealing disk of the utility model.

[0020] In the figure: 1. Hot air box; 2. Cage shaft; 3. Sealing ring; 4. Sealing groove 1; 5. Sealing groove 2; 6. Packing; 7. Skeleton seal; 8. Sealing disk; 9. Block; 10. Gap sealing disk; 11. Mounting slot. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The utility model provides Figure 1-Figure 3 The hot air box sealing structure of a coal mill shown in the figure includes a hot air box 1. A cage shaft 2 is passed through the hot air box 1. A sealing ring 3 is installed at the connection between the cage shaft 2 and the hot air box 1. The sealing ring 3 is connected to the cage shaft 2. The interior of the sealing ring 3 is a hollow structure. A sealing groove 1 4 and a sealing groove 2 5 are provided inside the sealing ring 3. The sealing groove 1 4 and the sealing groove 2 5 are isolated from each other. A packing 6 is installed inside the sealing groove 1 4. A skeleton seal 7 is installed inside the sealing groove 2 5. The packing 6 and the skeleton seal 7 on the sealing groove 1 4 and the sealing groove 2 5 are removable and replaceable.

[0023] A sealing ring 3 is installed at the connection between the hot air box 1 and the cage shaft 2 of the coal mill. A sealing groove 1 4 and a sealing groove 2 5 are pre-set inside the sealing ring 3 to isolate each other. A packing 6 is installed in the sealing groove 1 4 to preliminarily prevent the leakage of substances such as hot air and dust. At the same time, a skeleton seal 7 is installed in the sealing groove 2 5. Its special structure and material properties can further enhance the sealing effect, forming a double sealing defense line together with the packing 6.

[0024] If the sealing effect is found to have declined during operation, and it is determined upon inspection that the packing 6 in the sealing groove 1 4 is worn or the skeleton seal 7 in the sealing groove 2 5 is damaged, a replacement operation can be conveniently performed. Since the packing 6 and the skeleton seal 7 on the sealing groove 1 4 and the sealing groove 2 5 are designed to be detachable and replaceable, the operator can remove the damaged seal and then install a new packing 6 or skeleton seal 7 to quickly restore the sealing structure to good sealing performance and ensure the continued normal operation of the coal mill.

[0025] A double sealing design is adopted. The packing 6 provides the initial seal to block hot air and dust, and the skeleton seal 7 enhances the tightness, effectively preventing hot air leakage, reducing energy loss and improving thermal efficiency. Its good sealing performance prevents hot air and dust from entering key parts, extending the service life of the equipment and reducing maintenance and replacement costs. The design of removable and replaceable seals reduces maintenance costs and difficulty, shortens downtime and improves production efficiency. The stable sealing structure ensures the stability of the internal environment of the coal mill, reduces failures, improves the stability of equipment operation, and ensures the safe and stable operation of the pulverizing system.

[0026] A sealing disk 8 is installed in the center of the interior of the sealing ring 3. The sealing disk 8 divides the sealing ring 3 into two sealing structures, the upper and lower sealing structures. The sealing groove 1 4 and the sealing groove 2 5 are located in the upper sealing structure. Four clamping blocks 9 are installed on the inner wall of the sealing ring 3. The clamping blocks 9 are evenly distributed on the sealing ring 3. The sealing disk 8 is installed on the sealing ring 3 through the clamping blocks 9. The sealing disk 8 fits tightly against the inner wall of the sealing ring 3. A sealing rubber ring is provided between the sealing disk 8 and the inner wall of the sealing ring 3, and the sealing rubber ring is fixedly installed on the sealing disk 8;

[0027] Sealing disc 8 separates sealing ring 3 into two upper and lower sealing structures, forming a multi-layered sealing system. Even if the seal in the upper sealing structure becomes worn or damaged, sealing disc 8 and its sealing rubber ring effectively prevent hot air and dust from further penetrating into the lower area, significantly reducing the risk of seal failure and improving the reliability of the overall sealing structure during long-term operation.

[0028] A gap is provided at the connection between the stranding cage shaft 2 and the hot air box 1. A gap sealing disk 10 is connected to the inner side of the sealing ring 3 close to the hot air box 1. One side of the gap sealing disk 10 fits tightly with the gap on the hot air box 1. A mounting groove 11 is provided on the gap sealing disk 10, and a packing 6 is installed on the mounting groove 11.

[0029] If there is a gap between the stranding cage shaft 2 and the hot air box 1, install the sealing ring 3 at this connection. The gap sealing disk 10 on the side of the sealing ring 3 near the hot air box 1 is then in place, with one side fitting tightly against the gap in the hot air box 1. Install the packing 6 within the installation groove 11 of the gap sealing disk 10. During installation, the packing 6 fills the installation groove 11 and forms an initial sealing contact with the gap between the stranding cage shaft 2 and the hot air box 1.

[0030] When the coal mill is operating, hot air flows through the hot air box 1, attempting to escape through the gap between the cage shaft 2 and the hot air box 1. At this point, the packing 6 within the mounting groove 11 of the gap-sealing disc 10 comes into play. Its tight fit within the gap forms a primary sealing barrier for the hot air, preventing most of it from escaping. Furthermore, the tight fit of the gap-sealing disc 10 within the gap of the hot air box 1 further limits the hot air's leakage path, working in conjunction with the packing 6 to effectively reduce the amount of hot air leaking from this gap.

[0031] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed for the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal mill hot air box sealing structure, comprising a hot air box (1), characterized in that: The hot air box (1) is provided with a cage shaft (2), and a sealing ring (3) is installed at the connection between the cage shaft (2) and the hot air box (1). The sealing ring (3) is connected to the cage shaft (2), and the interior of the sealing ring (3) is a hollow structure. The interior of the sealing ring (3) is provided with a sealing groove 1 (4) and a sealing groove 2 (5), and the sealing groove 1 (4) and the sealing groove 2 (5) are isolated from each other. A packing (6) is installed inside the sealing groove 1 (4), and a skeleton seal (7) is installed inside the sealing groove 2 (5). The packing (6) and the skeleton seal (7) on the sealing groove 1 (4) and the sealing groove 2 (5) are detachable and replaceable.

2. A coal mill hot air box sealing structure according to claim 1, characterized in that: A sealing disk (8) is installed at a central position inside the sealing ring (3), and the sealing disk (8) separates the sealing ring (3) into two upper and lower sealing structures. The sealing groove 1 (4) and the sealing groove 2 (5) are located in the upper sealing structure.

3. The hot air box sealing structure of a coal mill according to claim 2, characterized in that: Four clamping blocks (9) are installed on the inner wall of the sealing ring (3), and the clamping blocks (9) are evenly distributed on the sealing ring (3).

4. A coal mill hot air box sealing structure according to any one of claims 2-3, characterized in that: The sealing disc (8) is mounted on the sealing ring (3) via a clamping block (9). The sealing disc (8) is tightly fitted to the inner wall of the sealing ring (3). A sealing rubber ring is provided between the sealing disc (8) and the inner wall of the sealing ring (3). The sealing rubber ring is fixedly mounted on the sealing disc (8).

5. The hot air box sealing structure of a coal mill according to claim 1, characterized in that: A gap is provided at the connection between the stranding cage shaft (2) and the hot air box (1).

6. The hot air box sealing structure of a coal mill according to claim 1, characterized in that: A gap sealing disk (10) is connected to the inner side of the sealing ring (3) close to the hot air box (1), one side of the gap sealing disk (10) is tightly fitted with the gap on the hot air box (1), and a mounting groove (11) is provided on the gap sealing disk (10), and a packing (6) is installed on the mounting groove (11).

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