Hot air adjusting door shaft sealing structure of coal mill

Abstract

The utility model discloses a coal mill hot air adjusting door shaft seal structure which comprises a door plate body, a hot air adjusting door shaft body and a shaft seal assembly, the hot air adjusting door shaft body is connected with the door plate body through an annular seat, the shaft seal assembly is fixed on the side wall of the door plate body, the annular seat is sleeved on the side wall of the hot air adjusting door shaft body, and the annular seat is of a cavity structure. An inner threaded pipe is fixed to the bottom of the annular base, the inner diameter of the inner threaded pipe is larger than that of the annular base, and the shaft seal assembly is located in the inner threaded pipe. Through three times of sealing treatment, the sealing effect is greatly improved, the ash leakage phenomenon is effectively prevented, the leakproofness of a system is ensured, grease can be automatically injected into the first sleeve in real time through the design of the feeding mechanism, the grease in the first sleeve is kept in a full-cavity state all the time, the sealing effect is improved, and the service life of the system is prolonged. And the trouble of manually and regularly adding the butter is avoided, and the practicability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of coal mill technology, and in particular to a shaft seal structure for a coal mill hot air regulating valve. Background Technology

[0002] A coal mill is a device used for grinding coal, widely used in industries such as power, metallurgy, and chemicals, especially in thermal power plants. Its main function is to grind raw coal into fine powder to facilitate combustion, improve combustion efficiency, and increase heat conversion rate. With the increasing demand for coal in thermal power generation and industrial production, the performance of the coal mill, as a crucial piece of equipment for coal powder preparation, directly affects the efficiency of electricity and heat production. The working environment of a coal mill is typically harsh; the grinding process generates a large amount of dust and heat, leading to frequent wear and tear and malfunctions. Therefore, ensuring the internal sealing performance of the coal mill, especially the shaft seal structure of the hot air control valve, is particularly important.

[0003] Traditional coal mill hot air regulating valve shaft seal structures typically employ simple mechanical seals or packing seals. These seals are prone to wear, aging, or failure during long-term operation, resulting in poor sealing performance. This leads to leakage of coal powder and dust, causing ash leakage. This not only affects the adjustment of the coal mill's operating conditions, making it difficult to accurately control the hot air flow, thus reducing the drying efficiency and combustion performance of the coal powder, but also pollutes the production environment. Over time, ash leakage not only affects the operating efficiency of the equipment but may also threaten the health of operators, increasing the risk of burns and other safety hazards. In addition, traditional shaft seal structures usually rely on grease for sealing. Although grease can provide lubrication and sealing effects to a certain extent, it will gradually be consumed or contaminated with long-term operation, leading to a decline in sealing effectiveness. Therefore, regular manual grease replenishment is necessary, reducing the practicality of the equipment. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a shaft seal structure for a coal mill hot air regulating valve.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A shaft seal structure for a hot air regulating valve of a coal mill includes a valve body, a hot air regulating valve shaft, and a shaft seal assembly. The hot air regulating valve shaft is connected to the valve body via an annular seat. The shaft seal assembly is fixed to the side wall of the valve body. An annular seat, which is a hollow structure, is fitted onto the side wall of the hot air regulating valve shaft. An internally threaded pipe is fixed to the bottom of the annular seat, and the inner diameter of the internally threaded pipe is larger than the inner diameter of the annular seat. The shaft seal assembly is located inside the internally threaded pipe. A fixing mechanism for fixing the internally threaded pipe and the annular seat is provided at the bottom of the valve body. A first sealing mechanism for sealing the internally threaded pipe is provided on the side wall of the valve body. A [missing information - likely a component or material] is fixed to the inner side wall of the annular seat. The first sleeve is fitted onto the side wall of the hot air control valve shaft. A second sealing mechanism for sealing the hot air control valve shaft is installed inside the first sleeve. A feeding mechanism for feeding material into the first sleeve is installed inside the annular seat. During use, this device achieves a significant improvement in sealing effect through three sealing processes, effectively preventing grease leakage and ensuring the system's airtightness. Through the design of the feeding mechanism, grease can be automatically injected into the first sleeve in real time, keeping the grease level in the first sleeve consistently full. This not only improves the sealing effect but also avoids the inconvenience of manually adding grease periodically, thus enhancing the practicality of the device.

[0007] Preferably, the fixing mechanism includes an external threaded tube, which is disposed on the side wall of the door panel body and is adapted to an internal threaded tube. A first annular plate is fixed to the bottom of the external threaded tube. The first annular plate is fixed to the door panel body and the outer diameter of the first annular plate is smaller than the outer diameter of the external threaded tube. An annular airbag is sleeved on the outer wall of the first annular plate.

[0008] Preferably, the top of the externally threaded tube has multiple through holes at equal intervals in a circular pattern. Each of the through holes has a second sleeve fitted onto its inner wall. Each of the second sleeves has a circular piston slidably connected to its inner wall. Each of the circular pistons has a connecting rod fixed to its top, and these connecting rods pass through the tops of the second sleeves. Each of the second sleeves has a branch pipe extending through its bottom, and these branch pipes communicate with an annular air bladder. The hot air damper shaft is fitted onto its side wall, and the annular seat is rotated, causing the externally threaded tube to gradually enter the internally threaded tube. During this process, the bottom of the annular seat gradually contacts the connecting rods, pushing them downwards. This causes the circular pistons to move downwards along the inner walls of the second sleeves, filling the annular air bladder with air through the branch pipes. This causes the annular air bladder to gradually expand and deform, sealing the gap between the internally and externally threaded tubes, thus completing the initial sealing process.

[0009] Preferably, the second sealing mechanism includes multiple second annular plates, which are fixed at equal intervals to the inner wall of the first sleeve and fitted onto the side wall of the hot air damper shaft. The side walls of the multiple second annular plates are provided with multiple circular holes at equal intervals. An annular boss is fixed to the bottom of the first sleeve and communicates with the first sleeve. An annular packing is fitted onto the side wall of the hot air damper shaft, and the annular boss and the annular packing are compatible. The feeding mechanism includes an annular piston disposed inside an annular seat. Multiple return springs are arranged at equal intervals in a circular pattern at the bottom of the annular seat, and all return springs are located below the annular piston. Multiple connecting pipes are arranged at equal intervals in a circular pattern through the top of the annular seat, and all connecting pipes communicate with the first sleeve. One-way valves are installed on the outer sides of each of the multiple connecting pipes. A feed pipe is arranged through the top of the annular seat, and a valve is installed on the outer wall of the feed pipe. When the annular boss and the annular packing are tightly fitted, a secondary sealing process is completed. After installation, grease is fed through the feed pipe. The feed pipe and valve continuously pressurize the annular seat. As grease is continuously injected, the pressure on the annular piston gradually increases, causing multiple return springs to gradually compress. At this time, the annular piston always has an upward tendency. When the space at the top of the annular piston is full, excess grease enters the first sleeve through multiple connecting pipes and multiple one-way valves. The grease enters the space formed by the first sleeve and multiple second annular plates through multiple round holes, performing a third sealing treatment on the hot air regulating valve shaft. Through the three sealing treatments, the sealing effect is greatly improved, preventing grease leakage. Over time, whenever the grease inside the first sleeve is consumed, the annular piston is pushed upward by the reaction of multiple compressed return springs, filling the first sleeve with grease through multiple connecting pipes and multiple one-way valves. This ensures that the grease inside the first sleeve is always full, guaranteeing the sealing effect and eliminating the need for workers to manually add grease to the first sleeve periodically, thus improving the practicality of the device.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. During use, this device undergoes three sealing processes, which greatly improves the sealing effect, effectively prevents ash leakage, and ensures the airtightness of the system.

[0012] 2. Through the design of the feeding mechanism, grease can be automatically injected into the first sleeve in real time, keeping the first sleeve full of grease at all times. This not only improves the sealing effect, but also avoids the trouble of manually adding grease periodically, thus improving the practicality of the device. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the structure of the hot air regulating valve shaft seal of a coal mill proposed in this utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the internal threaded pipe and annular seat of the shaft seal structure of the hot air regulating valve of a coal mill proposed in this utility model.

[0015] Figure 3 This is a schematic diagram of the internal structure of the annular seat of the hot air regulating valve shaft seal structure of a coal mill proposed in this utility model;

[0016] Figure 4 This is a schematic diagram showing the unfolded cross-section of the internal threaded pipe and the annular seat of the hot air regulating valve shaft seal structure for a coal mill proposed in this utility model.

[0017] Figure 5 This is a schematic cross-sectional view of the external threaded pipe and the second sleeve of the hot air regulating valve shaft seal structure for a coal mill proposed in this utility model.

[0018] Figure 6 This is a cross-sectional schematic diagram of the first sleeve and the annular boss of the hot air regulating valve shaft seal structure of a coal mill proposed in this utility model.

[0019] In the diagram: 1. Door panel body; 2. Internal threaded pipe; 3. Annular seat; 4. Hot air regulating door shaft; 5. Connecting pipe; 6. First sleeve; 7. Annular piston; 8. Return spring; 9. Shaft seal assembly; 10. External threaded pipe; 11. Annular airbag; 12. Feed pipe; 13. Valve; 14. One-way valve; 15. First annular plate; 16. Through hole; 17. Second sleeve; 18. Circular piston; 19. Connecting rod; 20. Branch pipe; 21. Annular boss; 22. Annular packing; 23. Second annular plate; 24. Circular hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Reference Figures 1-5A shaft seal structure for a hot air regulating valve of a coal mill includes a valve body 1, a hot air regulating valve shaft 4, and a shaft seal assembly 9. The hot air regulating valve shaft 4 is connected to the valve body 1 via an annular seat 3. The shaft seal assembly 9 is fixed to the side wall of the valve body 1. An annular seat 3 is sleeved on the side wall of the hot air regulating valve shaft 4, and the annular seat 3 has a cavity structure. An internally threaded pipe 2 is fixed to the bottom of the annular seat 3, and the inner diameter of the internally threaded pipe 2 is larger than the inner diameter of the annular seat 3. The shaft seal assembly 9 is located inside the internally threaded pipe 2. A fixing mechanism for fixing the internally threaded pipe 2 and the annular seat 3 is provided at the bottom of the valve body 1. A first sealing mechanism for sealing the internally threaded pipe 2 is provided on the side wall of the valve body 1. The inner wall of the annular seat 3 is fixed. A first sleeve 6 is provided and is fitted onto the side wall of the hot air regulating valve shaft 4. The first sleeve 6 is equipped with a second sealing mechanism for sealing the hot air regulating valve shaft 4. The annular seat 3 is equipped with a feeding mechanism for feeding material into the first sleeve 6. During use, this device greatly improves the sealing effect through three sealing processes, effectively preventing grease leakage and ensuring the airtightness of the system. Through the design of the feeding mechanism, grease can be automatically injected into the first sleeve 6 in real time, keeping the grease in the first sleeve 6 always in a full state. This not only improves the sealing effect but also avoids the trouble of manually adding grease periodically, thus improving the practicality of the device.

[0022] Furthermore, the fixing mechanism includes an externally threaded tube 10, which is disposed on the side wall of the door panel body 1 and is adapted to an internally threaded tube 2. A first annular plate 15 is fixed to the bottom of the externally threaded tube 10. The first annular plate 15 is fixed to the door panel body 1, and the outer diameter of the first annular plate 15 is smaller than the outer diameter of the externally threaded tube 10. An annular airbag 11 is sleeved on the outer wall of the first annular plate 15. Multiple through holes 16 are equally spaced in a circular pattern at the top of the externally threaded tube 10. A second sleeve 17 is sleeved on the inner wall of each of the multiple through holes 16. A circular piston 18 is slidably connected to the inner wall of each of the multiple second sleeves 17. A connecting rod 19 is fixed to the top of each of the multiple circular pistons 18, and the multiple connecting rods 19 pass through the top of each of the multiple second sleeves 17. Each part is provided with a branch pipe 20, and multiple branch pipes 20 are connected to the annular airbag 11. The hot air damper shaft 4 is sleeved on the side wall of the hot air damper shaft 4, and the annular seat 3 is rotated so that the external threaded pipe 10 gradually enters the interior of the internal threaded pipe 2. During the process of the external threaded pipe 10 entering the interior of the internal threaded pipe 2, the bottom of the annular seat 3 will gradually contact multiple connecting rods 19 and push the multiple connecting rods 19 downward. This causes multiple circular pistons 18 to move downward along the inner side wall of multiple second sleeves 17 respectively, and the air inside the multiple second sleeves 17 is filled into the annular airbag 11 through multiple branch pipes 20, so that the annular airbag 11 gradually expands and deforms, sealing the gap between the internal threaded pipe 2 and the external threaded pipe 10, completing the initial sealing treatment.

[0023] Furthermore, the second sealing mechanism includes multiple second annular plates 23, which are equidistantly fixed to the inner wall of the first sleeve 6 and fitted onto the side wall of the hot air damper shaft 4. The side walls of the multiple second annular plates 23 are equidistantly provided with multiple circular holes 24. An annular boss 21 is fixed to the bottom of the first sleeve 6 and communicates with the first sleeve 6. An annular packing 22 is fitted onto the side wall of the hot air damper shaft 4, and the annular boss 21 and the annular packing 22 are compatible. The feeding mechanism includes an annular piston 7. The annular seat 3 is equipped with multiple return springs 8 arranged in a circular pattern at equal intervals at the bottom of the annular seat 3, all of which are located below the annular piston 7. Multiple connecting pipes 5 are arranged in a circular pattern at equal intervals at the top of the annular seat 3, and all of these connecting pipes 5 communicate with the first sleeve 6. A one-way valve 14 is installed on the outer side of each connecting pipe 5. A feed pipe 12 is installed through the top of the annular seat 3, and a valve 13 is installed on the outer wall of the feed pipe 12. When the annular boss 21 and the annular packing 22 are tightly fitted together, completing the secondary sealing process, grease is fed through the feed pipe after installation. Pipe 12 and valve 13 are continuously pressed into the annular seat 3. As grease is continuously injected, the pressure on the annular piston 7 gradually increases, causing multiple return springs 8 to gradually compress. At this time, the annular piston 7 always has an upward tendency. When the space at the top of the annular piston 7 is full, the excess grease enters the first sleeve 6 through multiple connecting pipes 5 and multiple one-way valves 14. The grease enters the space formed by the first sleeve 6 and multiple second annular plates 23 through multiple round holes 24, respectively, to perform a third sealing treatment on the hot air regulating valve shaft 4. Through the three sealing treatments, the sealing effect is greatly improved, and grease leakage is avoided. As time goes by, whenever the grease inside the first sleeve 6 is consumed, the annular piston 7 will be pushed upward by the reaction of multiple compressed return springs 8, filling the grease inside the annular seat 3 into the first sleeve 6 through multiple connecting pipes 5 and multiple one-way valves 14. This ensures that the grease inside the first sleeve 6 is always in a full state, which not only ensures the sealing effect, but also eliminates the need for workers to manually add grease to the first sleeve 6 periodically, thus improving the practicality of the device.

[0024] Working principle: During use, the internal threaded tube 2 and the annular seat 3 are pre-installed. During installation, the hot air damper shaft 4 is fitted onto its side wall, and the annular seat 3 is rotated, causing the external threaded tube 10 to gradually enter the internal threaded tube 2. As the external threaded tube 10 enters the internal threaded tube 2, the bottom of the annular seat 3 gradually contacts multiple connecting rods 19, pushing them downwards. This, in turn, causes multiple circular pistons 18 to move downwards along the inner walls of multiple second sleeves 17. Air from the multiple second sleeves 17 is injected into the annular air bladder 11 through multiple branch pipes 20, causing the annular air bladder 11 to gradually expand and deform, sealing the gap between the internal threaded pipe 2 and the external threaded pipe 10, completing the initial sealing process. This continues until all the connecting rods 19 are inserted into the multiple second sleeves 17. At this point, the annular boss 21 and the annular packing 22 fit tightly together, completing the secondary sealing process. After installation, grease is continuously pressed into the annular seat 3 through the feed pipe 12 and valve 13. As grease is continuously injected, the pressure on the annular piston 7 gradually increases, causing the multiple return springs 8 to gradually compress. At this time, the annular piston 7 always has an upward tendency. When the space at the top of the annular piston 7 is full, excess grease enters the first sleeve 6 through multiple connecting pipes 5 and multiple one-way valves 14. The grease enters the space formed by the first sleeve 6 and multiple second annular plates 23 through multiple round holes 24, respectively, to perform a third sealing treatment on the hot air regulating valve shaft 4. Through the three sealing treatments, the sealing effect is greatly improved, and grease leakage is avoided. As time goes by, whenever the grease inside the first sleeve 6 is consumed, the annular piston 7 will be pushed upward by the reaction of multiple compressed return springs 8, filling the grease inside the annular seat 3 into the first sleeve 6 through multiple connecting pipes 5 and multiple one-way valves 14. This ensures that the grease inside the first sleeve 6 is always in a full state, which not only ensures the sealing effect, but also eliminates the need for workers to manually add grease to the first sleeve 6 periodically, thus improving the practicality of the device.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A shaft seal structure for a coal mill hot air regulating valve, comprising a valve body (1), a hot air regulating valve shaft (4), and a shaft seal assembly (9), characterized in that, The hot air regulating door shaft (4) is connected to the door panel body (1) via an annular seat (3). The shaft seal assembly (9) is fixed on the side wall of the door panel body (1). The annular seat (3) is sleeved on the side wall of the hot air regulating door shaft (4), and the annular seat (3) is a cavity structure. An internal threaded tube (2) is fixed at the bottom of the annular seat (3), and the inner diameter of the internal threaded tube (2) is larger than the inner diameter of the annular seat (3). The shaft seal assembly (9) is located inside the internal threaded tube (2). The bottom of the door panel body (1) is provided with a useful... The fixing mechanism for fixing the internal threaded tube (2) and the annular seat (3) is provided with a first sealing mechanism for sealing the internal threaded tube (2) on the side wall of the door panel body (1), a first sleeve (6) is fixed on the inner side wall of the annular seat (3), and the first sleeve (6) is sleeved on the side wall of the hot air regulating valve shaft (4). A second sealing mechanism for sealing the hot air regulating valve shaft (4) is provided inside the first sleeve (6), and a feeding mechanism for feeding material into the first sleeve (6) is provided inside the annular seat (3).

2. The coal mill hot air regulating valve shaft seal structure according to claim 1, characterized in that, The fixing mechanism includes an external threaded tube (10), which is disposed on the side wall of the door panel body (1) and is adapted to an internal threaded tube (2). A first annular plate (15) is fixed at the bottom of the external threaded tube (10). The first annular plate (15) is fixed to the door panel body (1), and the outer diameter of the first annular plate (15) is smaller than the outer diameter of the external threaded tube (10). An annular airbag (11) is sleeved on the outer side wall of the first annular plate (15).

3. The coal mill hot air regulating valve shaft seal structure according to claim 2, characterized in that, The external threaded tube (10) has multiple through holes (16) at equal intervals in a circular pattern at the top. The inner walls of the multiple through holes (16) are fitted with second sleeves (17). The inner walls of the multiple second sleeves (17) are slidably connected with circular pistons (18). The tops of the multiple circular pistons (18) are fixed with connecting rods (19), and the multiple connecting rods (19) pass through the tops of the multiple second sleeves (17). The bottoms of the multiple second sleeves (17) are provided with branch pipes (20), and the multiple branch pipes (20) are connected to the annular airbag (11).

4. The coal mill hot air regulating valve shaft seal structure according to claim 1, characterized in that, The second sealing mechanism includes multiple second annular plates (23), which are fixed at equal distances to the inner wall of the first sleeve (6), and are sleeved on the side wall of the hot air regulating valve shaft (4).

5. The coal mill hot air regulating valve shaft seal structure according to claim 4, characterized in that, Multiple second annular plates (23) have multiple circular holes (24) evenly spaced on their sidewalls.

6. The coal mill hot air regulating valve shaft seal structure according to claim 1, characterized in that, The bottom of the first sleeve (6) is fixed with an annular boss (21), and the annular boss (21) and the first sleeve (6) are connected. The side wall of the hot air regulating valve shaft (4) is fitted with an annular packing (22), and the annular boss (21) and the annular packing (22) are compatible.

7. The coal mill hot air regulating valve shaft seal structure according to claim 1, characterized in that, The feeding mechanism includes an annular piston (7), which is located inside an annular seat (3). Multiple return springs (8) are arranged in a circular pattern at equal intervals at the bottom of the annular seat (3), and all the return springs (8) are located below the annular piston (7).

8. The coal mill hot air regulating valve shaft seal structure according to claim 1, characterized in that, The top of the annular seat (3) is provided with multiple connecting pipes (5) arranged in a circular pattern at equal intervals, and all of the multiple connecting pipes (5) are connected to the first sleeve (6).

9. The coal mill hot air regulating valve shaft seal structure according to claim 8, characterized in that, One-way valves (14) are installed on the outside of each of the multiple connecting pipes (5).

10. The coal mill hot air regulating valve shaft seal structure according to claim 1, characterized in that, The top of the annular seat (3) is provided with a feed pipe (12), and a valve (13) is installed on the outer wall of the feed pipe (12).

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