A sealing assembly and sealing structure for the primary air chamber of a coal mill

Abstract

This utility model discloses a sealing assembly and sealing structure for the primary air chamber of a coal mill, belonging to the technical field of sealing structure. The sealing assembly for the primary air chamber of a coal mill includes several sealing seats arranged in a circumferential array. These sealing seats are assembled into a sealing ring assembly. Each sealing seat has a U-shaped structure with an opening on one side. A sealing block for sealing is fitted into the center of the sealing seat, and one side of the sealing block extends from the opening of the sealing seat. Using the sealing assembly and sealing structure for the primary air chamber of a coal mill described in this utility model can solve the problems of inconvenient disassembly and assembly and short service life of existing sealing assemblies.

Description

Technical Field

[0001] This utility model relates to the field of sealing structure technology, and in particular to a sealing component and sealing structure for the primary air chamber of a coal mill. Background Technology

[0002] In the daily operation system of a disc coal mill, the primary air needs to pass through the air chamber. Through the coordinated action of the rotating grinding disc and the nozzle, the coal powder is heated and transported to the furnace. This airflow path is the core link to ensure the normal operation of the coal mill.

[0003] To prevent primary air leakage from causing failure of key components such as the reducer, coal mill disc base, and carbon crystal seal, existing technology incorporates a two-stage sealing structure at the bottom of the disc frame. This includes a primary aramid packing seal, whose core function is to block primary air at the gap between the disc frame and the bottom fixed frame to control the initial leakage. The secondary carbon precision ring seal serves as a supplement to the primary seal, sealing any leaked air that the primary seal fails to completely block. This prevents the leaked air from heating the bottom reducer and prevents the reducer from malfunctioning due to abnormal temperature increases.

[0004] However, the existing sealing structure described above is prone to wear and failure of the primary aramid packing seal during long-term operation, leading to a significant increase in primary air leakage. When the leakage exceeds the sealing capacity limit of the secondary carbon ring seal, the leaked hot primary air directly affects the bottom reducer, causing the reducer temperature to rise continuously and ultimately resulting in a coal mill shutdown, severely impacting the stability and continuity of unit operation. Furthermore, replacing the failed primary aramid packing seal is extremely inconvenient due to the limited internal working space of the coal mill. Multiple components, including the coal pipe, powder outlet pipe, separator, central frame, grinding rollers, grinding disc, rotating ring, and stationary ring, must be disassembled sequentially. Utility Model Content

[0005] The purpose of this utility model is to provide a sealing component and sealing structure for the primary air chamber of a coal mill, which solves the problems of inconvenient disassembly and assembly and short service life of existing sealing components.

[0006] To achieve the above objectives, this utility model provides a sealing assembly for the primary air chamber of a coal mill, comprising several sealing seats arranged in a circumferential array, the several sealing seats being assembled into a sealing ring assembly, the sealing seat being a U-shaped structure with an opening on one side, a sealing block for sealing being clamped in the middle of the sealing seat, and one side of the sealing block extending out from the opening of the sealing seat.

[0007] Preferably, the sealing seat has a first partition and a second partition in the middle, and the first partition, the second partition and the side wall of the sealing seat form a groove, and the sealing block is engaged in the groove.

[0008] Preferably, the sealing block is an aramid packing seal.

[0009] Preferably, a reinforcing plate is provided between the first partition and the second partition, and the first partition, the second partition and the reinforcing plate form a groove.

[0010] Preferably, the reinforcing plate is slidably connected to the first partition and the second partition, and a screw is threadedly connected to the side wall of the sealing seat, with one end of the screw being rotatably connected to the reinforcing plate.

[0011] Preferably, the top of the sealing seat is provided with a top plate, and the top plate is provided with a groove corresponding to the original bolt of the coal mill, and the original bolt is located in the groove; the bottom of the sealing seat is provided with a bottom plate.

[0012] Preferably, there are 12 sealing seats, and adjacent sealing seats are sealed and fixedly connected by welded seams.

[0013] Preferably, the sealing seat is a steel frame.

[0014] A sealing structure for the primary air chamber of a coal mill includes the aforementioned sealing component. The sealing component is sleeved on the side of the primary sealing ring near the air chamber and fixed on the grinding disc seat. A secondary sealing ring for secondary sealing of the air chamber is provided between the air chamber and the grinding disc seat.

[0015] Preferably, the inner side of the sealing block in the sealing assembly is fitted to the gap of the primary sealing ring.

[0016] The advantages and positive effects of the sealing assembly and sealing structure for the primary air chamber of the coal mill described in this utility model are as follows: The sealing assembly of this application is assembled from several sealing blocks of the same structural dimensions, which facilitates the installation of the sealing assembly. A groove is opened on the top plate of the mounting base, so the original bolts on the coal mill do not need to be removed; they can be directly snapped into the groove, eliminating the need for extensive disassembly and reassembly, thus improving maintenance efficiency. The sealing assembly is sleeved on the outside of the primary sealing ring, protecting the primary sealing ring and extending its service life. A three-layer seal is used between the air chamber and the reducer chamber, improving the sealing effect.

[0017] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the sealing component according to Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the sealing seat structure of Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the sealing block installation structure of Embodiment 1 of this utility model; Figure 4 This is a side view of the sealing seat according to Embodiment 1 of this utility model; Figure 5 This is a three-dimensional structural diagram of the sealing seat according to Embodiment 2 of this utility model; Figure 6 This is a schematic diagram of the cross-sectional structure of the sealing seat in Embodiment 2 of this utility model; Figure 7 This is a schematic diagram of the sealing structure of Embodiment 3 of this utility model.

[0019] Figure Labels 1. Sealing seat; 2. Sealing block; 3. Top plate; 4. Bottom plate; 5. First partition; 6. Second partition; 7. Reinforcing plate; 8. Groove; 9. Slot; 10. Screw; 11. Primary sealing ring; 12. Secondary sealing ring. Detailed Implementation

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are 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 limitations on this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0022] Example 1 like Figure 1-4 As shown, a sealing assembly for the primary air chamber of a coal mill includes several sealing seats 1 arranged in a circumferential array, which are assembled into a sealing ring. The sealing seat 1 is a U-shaped structure with an opening on one side. The segmented U-shaped structure of the sealing seat 1 facilitates segmented installation, making the installation and disassembly of the sealing assembly relatively convenient.

[0023] A sealing block 2 for sealing is fitted in the middle of the sealing seat 1. One side of the sealing block 2 extends from the opening of the sealing seat 1 for sealing the gap. The sealing block 2 is an aramid packing seal.

[0024] A first partition 5 and a second partition 6 are provided in the middle of the sealing seat 1. Both the first partition 5 and the second partition 6 are fixed to the side wall of the sealing seat 1 by welding, or are integrally formed with the sealing seat 1. The first partition 5 and the second partition 6 form a groove 9 with the side wall of the sealing seat 1, and the sealing block 2 is engaged in the groove 9. The thickness of the sealing block 2 is slightly greater than the thickness of the groove 9 to improve the stability of the installation of the sealing block 2.

[0025] A reinforcing plate 7 is provided between the first partition 5 and the second partition 6. The reinforcing plate 7 is fixed perpendicularly to the first partition 5 and the second partition 6, and both ends of the reinforcing plate 7 are flush with both ends of the first partition 5 and the second partition 6. The reinforcing plate 7 improves the supporting strength of the first partition 5 and the second partition 6. The first partition 5, the second partition 6 and the reinforcing plate 7 form a groove 9.

[0026] The top of the sealing seat 1 is provided with a top plate 3, which is fixedly connected to the side wall of the sealing seat 1 by welding or is an integrally formed structure. The top plate 3 has a slot 8 corresponding to the original bolts of the coal mill, and the original bolts are located within the slot 8, facilitating the installation of the sealing seat 1. When installing the sealing assembly, the original bolts are directly inserted into the slot 8 without disassembling them, thus improving installation efficiency. The bottom of the sealing seat 1 is provided with a bottom plate 4, which is fixedly connected to the side wall of the sealing seat 1 by welding or is an integrally formed structure.

[0027] In this embodiment, there are 12 sealing seats 1, and adjacent sealing seats 1 are sealed and fixedly connected by welded seams. The sealing seat 1 is a steel frame made of No. 45 steel.

[0028] Example 2 like Figure 5 , Figure 6 As shown, the difference between this embodiment and Embodiment 1 is that a threaded hole is provided in the middle of the side wall of the mounting base in this embodiment. A screw 10 is threadedly connected to the threaded hole, and the screw 10 is threadedly connected to the mounting base through the threaded hole. The end of the screw 10 that contacts the reinforcing plate 7 is rotatably connected through a bearing. The reinforcing plate 7 is a separate structure from the first partition plate 5 and the second partition plate 6, and the reinforcing plate 7 is slidably connected to the first partition plate 5 and the second partition plate 6. By rotating the screw 10, the screw 10 moves inward under the action of the threaded hole. The screw 10 drives the reinforcing plate 7 to move inward, and the reinforcing plate 7 pushes the sealing block 2 to press against the connection gap of the primary seal, thus re-sealing the loose gap.

[0029] Example 3 like Figure 7As shown, a sealing structure for the primary air chamber of a coal mill includes the sealing assembly described in Embodiment 1 or Embodiment 2. The sealing assembly is fitted onto the side of the primary sealing ring 11 near the air chamber. The sealing assembly is fixed to the grinding disc seat by welding. A secondary sealing ring 12 is provided between the air chamber and the grinding disc seat to provide a secondary seal for the air chamber. The primary sealing ring 11 is an aramid packing seal, and the secondary sealing ring 12 is a carbon crystal ring seal. The air chamber and the reducer chamber are sealed through three layers of sealing, improving the sealing effect.

[0030] The installation steps for the sealing assembly are as follows: The aramid packing is inserted into the groove 9, with the inner side of the aramid packing protruding from the opening of the sealing seat 1. The mounting base with the aramid packing is then fitted into the gap of the primary sealing ring 11. The sealing block 2 seals the gap of the primary sealing ring 11 from the inside of the air chamber. The sealing block 2 is welded and fixed to the grinding disc base. All sealing seats 1 are installed sequentially, with the sealing blocks 2 inserted into the groove 9. After the sealing seats 1 are installed, J422 welding rods are used to weld and fix the sealing seats 1 together, forming a ring-shaped sealing assembly, thus completing the installation.

[0031] Therefore, the sealing assembly and sealing structure of the primary air chamber of the coal mill described in this utility model can solve the problems of inconvenient disassembly and assembly and short service life of existing sealing assemblies.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A sealing assembly for the primary air chamber of a coal mill, characterized in that: It includes several sealing seats arranged in a circular array, and the sealing seats are assembled into a sealing ring. The sealing seat is a U-shaped structure with an opening on one side. A sealing block for sealing is clamped in the middle of the sealing seat, and one side of the sealing block extends out from the opening of the sealing seat.

2. The sealing assembly for the primary air chamber of a coal mill according to claim 1, characterized in that: The sealing seat has a first partition and a second partition in the middle. The first partition, the second partition and the side wall of the sealing seat form a groove, and the sealing block is stuck in the groove.

3. The sealing assembly for the primary air chamber of a coal mill according to claim 1, characterized in that: The sealing block is an aramid packing seal.

4. A sealing assembly for the primary air chamber of a coal mill according to claim 2, characterized in that: A reinforcing plate is provided between the first partition and the second partition, and the first partition, the second partition and the reinforcing plate form a groove.

5. A sealing assembly for the primary air chamber of a coal mill according to claim 4, characterized in that: The reinforcing plate is slidably connected to the first partition and the second partition, and a screw is threadedly connected to the side wall of the sealing seat, with one end of the screw being rotatably connected to the reinforcing plate.

6. The sealing assembly for the primary air chamber of a coal mill according to claim 1, characterized in that: The top of the sealing seat is provided with a top plate, and the top plate is provided with a groove corresponding to the original bolt of the coal mill, and the original bolt is located in the groove; the bottom of the sealing seat is provided with a bottom plate.

7. A sealing assembly for the primary air chamber of a coal mill according to claim 1, characterized in that: There are 12 sealing seats, and adjacent sealing seats are sealed and fixedly connected by welded seams.

8. A sealing assembly for the primary air chamber of a coal mill according to claim 1, characterized in that, The sealing seat is a steel frame.

9. A sealing structure for the primary air chamber of a coal mill, characterized in that: The sealing assembly includes the sealing component as described in any one of claims 1-8, wherein the sealing component is sleeved on the side of the primary sealing ring near the air chamber, the sealing component is fixed on the grinding disc seat, and a secondary sealing ring for secondary sealing of the air chamber is provided between the air chamber and the grinding disc seat.

10. A sealing structure for the primary air chamber of a coal mill according to claim 9, characterized in that: The inner side of the sealing block inside the sealing assembly fits against the gap of the primary sealing ring.

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