An external sealing mechanism and gas sealing device for a coal mill

Abstract

This invention discloses an external sealing mechanism and gas sealing device for a coal mill, including a sealing frame with a slot in the middle. In use, the sealing frame is removed, and the installed rubber ring and the sealing rings on the auxiliary clamping frames at the upper and lower ends are inspected to prevent damage. During use, the sealing frame can be fitted onto the required sealing locations on the outside of the coal mill. Depending on the size of the sealing location, the sealing frame connected by the telescopic pad can be adjusted to accommodate different sealing locations on different coal mills. After installation, the sealing effect is further improved by attaching the sealing ring to the placement slot on the upper end of the auxiliary clamping frame, and it is fixed by a movable buckle, facilitating maintenance and replacement of the sealing ring.

Description

Technical Field

[0001] This invention relates to the technical field of coal mills, specifically to an external sealing mechanism and gas sealing device for a coal mill. Background Technology

[0002] The coal grinding process is the process of crushing coal and continuously increasing its surface area. To increase the surface area, the intermolecular forces of solid molecules must be overcome, thus requiring energy. Coal is ground into pulverized coal in a coal mill, mainly through three methods: crushing, impact crushing, and grinding. Crushing consumes the least energy, while grinding is the most energy-intensive. Various coal mills employ two or all three methods in their pulverizing process, but the dominant method depends on the type of mill. In rapidly developing modern industry, the operating environment of mechanical seals is undergoing profound changes, with increasingly stringent requirements. Operating conditions are trending towards high speed, high pressure, low temperature, high vacuum, large size, and micro-size. Taking petrochemicals as an example, the development direction of petrochemical pumps is towards larger scale, speed regulation, mechatronics, and complete pump product sets. Sealing devices are primarily measures to prevent the working medium from leaking from the machine (or equipment) or external impurities from entering its interior. The sealed working medium can be gas, liquid, or powdered solid. Poor sealing reduces machine efficiency, causes waste, and pollutes the environment. Leaks of flammable, explosive, or toxic working media can endanger personal and equipment safety. Ingress of gas, water, or dust into equipment can contaminate the working media, affect product quality, increase wear on parts, and shorten machine life. Seals are classified as static seals and dynamic seals. Seals between relatively stationary parts in machinery (or equipment) are called static seals; seals between relatively moving parts are called dynamic seals.

[0003] Seals for pumps and motors are developing towards larger sizes and greater specialization, especially for high-pressure, variable-speed turbines, high-temperature, low-temperature and ultra-low-temperature pumps, variable-speed pumps, corrosion-resistant pumps, and pumps conveying viscous media and media containing solid particles. The sealing technology and products for these applications are developing rapidly. When using coal mills, the same sealing operation needs to be performed in different locations. There are air leakage losses between the compressor rotor and stator, such as between the rotor blade tip and the casing, between the rectifier inner ring and the rotor drum, and between the front and rear end faces of the rotor and the casing, which seriously affect the compressor efficiency. Therefore, in addition to correctly selecting the clearance, a sealing device must be used. Sealing devices can be divided into two types: contact seals and non-contact seals. The expansion ring seal is the most common type of contact seal. The advantage of the expansion ring seal is that it effectively reduces the leakage area. There is friction between the sealing ring and the expansion ring, making it suitable for environments with low relative linear velocity or oil, such as oil baffles in bearing housings. Non-contact seals are mainly used for interstage sealing in compressors. According to aerodynamics, the leakage rate depends on the leakage area, the pressure difference between the two ends of the leakage (which determines the leakage velocity), and the air density. Therefore, effective measures to achieve a sealing effect are to reduce the leakage area and the pressure difference. It is also necessary to install sealing devices in different locations. Therefore, we need an external sealing mechanism and sealing device for coal mills.

[0004] The currently used external sealing mechanism and gas sealing device for coal mills cannot be adapted to different sizes and positions for installation and use when operating the coal mill. At the same time, the sealing effect deteriorates after a long period of use, making it inconvenient to replace the sealing components. It is also not convenient to fix the device at different angles in multiple positions during use, cannot improve the gas sealing effect during use, and is not easy to control after use. Summary of the Invention

[0005] The purpose of this invention is to provide an external sealing mechanism and gas sealing device for a coal mill to solve the problems mentioned in the background art.

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

[0007] A coal mill external sealing mechanism and gas sealing device includes a sealing frame, a rubber ring fitted to the inner wall of the sealing frame, a slot in the middle of the sealing frame, a telescopic soft pad installed at one end of the slot, a fixing hole in the upper end of the sealing frame, an auxiliary clamping frame installed above the fixing hole, a fitting groove in one end of the auxiliary clamping frame, a placement groove in the upper end of the auxiliary clamping frame, a sealing ring installed above the placement groove, movable buckles installed at both ends of the auxiliary clamping frame, threaded rods penetrating the upper ends of the movable buckles, threaded holes in the four corners of a fixing plate, screws installed at one end of the threaded holes, a limiting frame fitted in the middle of the fixing plate, an external pressure relief hole in the bottom of the limiting frame, an operating platform installed inside the limiting frame, an internal pressure relief hole in the bottom of the operating platform, a movable shaft installed at the upper end of the operating platform, a rotating buckle installed at the upper end of the movable shaft, an adjusting rod installed at the outer end of the rotating buckle, and a sealing pad fitted to the lower end of the adjusting rod.

[0008] Preferably, the telescopic pad is engaged with the sealing frame via a slot, and the sealing frame forms a telescopic structure via the telescopic pad.

[0009] Preferably, the auxiliary clamping frame is engaged with the sealing frame through a fixing hole, and the size of the auxiliary clamping frame is smaller than the size of the sealing frame.

[0010] Preferably, the auxiliary clamping frame is movably connected to the movable buckle, and the auxiliary clamping frame is threadedly connected to the movable buckle via a threaded rod.

[0011] Preferably, the auxiliary clamping frame is symmetrically arranged with respect to the central axis of the sealing frame, and the auxiliary clamping frame is in close contact with the sealing ring.

[0012] Preferably, the limiting frame is welded to the fixing plate, and the bottom of the limiting frame is provided with an opening.

[0013] Preferably, the bottom of the operating table is provided with an opening, and the operating table forms a rotating structure with a movable shaft and a rotating buckle.

[0014] Preferably, the rotating buckle is welded to the movable shaft, and the rotating buckle is distributed parallel to the operating table.

[0015] Preferably, the adjusting rods are arranged in a circular array with rotating buckles, and the adjusting rods are in close contact with the sealing gasket.

[0016] Preferably, the external sealing mechanism and gas sealing device for a coal mill includes the following steps:

[0017] S1. Adjust the size of the installed sealing frame using the stretchable soft pad, and then fit the adjusted sealing frame onto the device to facilitate fixing the sealing frame.

[0018] S2. Place the sealing ring in the upper and lower auxiliary clamping frames through the opening placement slots, rotate the movable buckle to clamp and fix the sealing ring, and then turn the threaded rod to keep the sealing ring stable.

[0019] S3. Install and fix the fixing plate through the threaded holes. After fixing, it can be fixed by turning the screw.

[0020] S4. Next, match the external pressure relief hole in the limit frame with the internal pressure relief hole in the operating table. The adjustment rod can be adjusted to rotate the machine via the installed movable shaft.

[0021] S5. Finally, rotate the rotating buckle in the device through the movable shaft installed below. This will block the sealing gasket that is attached to the lower end of the adjusting rod and the external pressure relief hole. Blocking the gasket will increase the air seal effect of the device.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. By using a sealing frame, rubber ring, slot, and telescopic pad, the sealing frame can be adjusted to different sizes at different locations during installation of the sealing device at the coal mill. This allows for effective sealing at interfaces of different sizes after adjustment, ensuring installation adaptability.

[0024] 2. The device employs an auxiliary clamping frame, a placement slot, a sealing ring, a movable buckle, and a threaded rod. The upper and lower sets of auxiliary clamping frames installed in the device can better maintain the stability of the connection at the sealing position. After stabilization, the sealing ring can be placed through the placement slot for easy replacement. To maintain the installation stability of the sealing ring, it is fixed by the movable buckle, which facilitates disassembly and maintenance and ensures stable use.

[0025] 3. By using a fixed plate, screws, limiting frame, and operating platform, the entire fixed plate can be more conveniently installed and fixed outside the coal mill during use, which can improve the operation and use of the device.

[0026] 4. The system employs a design that includes a limiting frame, external pressure relief holes, an operating platform, and internal pressure relief holes. The number of external pressure relief holes at the bottom of the limiting frame and the number of internal pressure relief holes at the bottom of the operating platform are the same. The pressure relief holes can be plugged and fixed using the adjusting rod installed on the operating platform, thereby improving the air seal effect.

[0027] 5. The system employs an operating platform, internal pressure relief hole, movable shaft, rotating buckle, and adjusting rod. The rotating buckle can rotate the adjusting rod via the movable shaft, and after rotation, it can block the external pressure relief hole, facilitating operation and control of the entire air sealing device, thus improving efficiency. Attached Figure Description

[0028] Figure 1 This is a cross-sectional structural diagram of an external sealing mechanism and gas sealing device for a coal mill according to the present invention;

[0029] Figure 2 This is a schematic diagram of the component structure of an external sealing mechanism and gas sealing device for a coal mill according to the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the sealing frame components of the external sealing mechanism and gas sealing device for a coal mill according to the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the auxiliary clamping frame components of the external sealing mechanism and gas sealing device of a coal mill according to the present invention;

[0032] Figure 5 This is a cross-sectional structural schematic diagram of an external sealing mechanism and gas sealing device for a coal mill according to the present invention;

[0033] Figure 6 This is a side view of the external sealing mechanism and gas sealing device for a coal mill according to the present invention.

[0034] Figure 7 This is a bottom view schematic diagram of the external sealing mechanism and gas sealing device of a coal mill according to the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of the fixing plate and limiting frame of the external sealing mechanism and gas sealing device of a coal mill according to the present invention;

[0036] Figure 9 This is a schematic diagram of the component structure of the operating table of the external sealing mechanism and gas sealing device for a coal mill according to the present invention.

[0037] In the diagram: 1. Sealing frame; 2. Rubber ring; 3. Slot; 4. Telescopic pad; 5. Fixing hole; 6. Auxiliary clamping frame; 7. Fitting groove; 8. Placement groove; 9. Sealing ring; 10. Movable buckle; 11. Threaded rod; 12. Fixing plate; 13. Threaded hole; 14. Screw; 15. Limiting frame; 16. External pressure relief hole; 17. Operating table; 18. Internal pressure relief hole; 19. Movable shaft; 20. Rotary buckle; 21. Adjusting rod; 22. Sealing gasket. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figure 1-9 This invention provides a technical solution for an external sealing mechanism and gas sealing device for a coal mill:

[0040] A coal mill external sealing mechanism and gas sealing device includes a sealing frame 1, a rubber ring 2 attached to the inner wall of the sealing frame 1, a groove 3 in the middle of the sealing frame 1, and a telescopic soft pad 4 installed at one end of the groove 3. The telescopic soft pad 4 is engaged with the sealing frame 1 through the groove 3, and the sealing frame 1 forms a telescopic structure through the telescopic soft pad 4. The sealing frame 1 installed in the device can be adjusted by a certain distance through the telescopic soft pad 4, and can be used for sealing at different sizes after adjustment. A fixing hole 5 is opened at the upper end of the sealing frame 1, and an auxiliary clamping frame 6 is installed at the upper end of the fixing hole 5. A fitting groove 7 is opened at one end of the auxiliary clamping frame 6, and a placement groove 8 is opened at the upper end of the auxiliary clamping frame 6. The auxiliary clamping frame 6 is engaged with the sealing frame 1 through the fixing hole 5, and the auxiliary clamping frame 6 is engaged with the sealing frame 1 through the fixing hole 5. The size of the auxiliary clamping frame 6 is smaller than that of the sealing frame 1. The two sets of symmetrically installed auxiliary clamping frames 6 in the device can better fit the sealing ring 9 and improve the sealing effect of the entire sealing device. The sealing ring 9 is installed on the upper end of the placement groove 8. Movable buckles 10 are installed at both ends of the auxiliary clamping frame 6. The upper end of the movable buckle 10 is connected to a threaded rod 11. The auxiliary clamping frame 6 is movably connected to the movable buckle 10, and the auxiliary clamping frame 6 is threadedly connected to the movable buckle 10 through the threaded rod 11. After the device is installed, the sealing ring 9 can be fixed by rotating the movable buckle 10, which also facilitates disassembly and replacement, and always maintains the sealing effect of the device. Threaded holes 13 are opened at the four corners of the fixing plate 12. A screw 14 is installed at one end of the threaded hole 13 for fixing. A limiting frame 15 is fitted into the middle of plate 12. The limiting frame 15 is welded to the fixed plate 12, and the bottom of the limiting frame 15 is open. The open-hole design of the limiting frame 15 allows for better installation and use, and facilitates control operation. An external pressure relief hole 16 is provided at the bottom of the limiting frame 15. An operating table 17 is installed inside the limiting frame 15. An internal pressure relief hole 18 is provided at the bottom of the operating table 17. A movable shaft 19 is installed at the upper end of the movable shaft 19. A rotating buckle 20 is installed at the upper end of the rotating buckle 20. An adjusting rod 21 is installed at the outer end of the rotating buckle 20. A sealing gasket 22 is attached to the lower end of the adjusting rod 21. The rotating buckle 20 is welded to the movable shaft 19, and the rotating buckle 20 is parallel to the operating table 17. After the rotating buckle 20 is connected to the movable shaft 19, the rotating buckle 20 in the device can... The control panel 17 is operated via the movable shaft 19. The adjusting rods 21 are arranged in a circular array with rotating buckles 20, and the adjusting rods 21 are tightly fitted with the sealing gaskets 22. This allows for control by coordinating the sealing gaskets 22 attached to the adjusting rods 21 with the external pressure relief holes 16 on the limiting frame 15. During installation and use, the external pressure relief holes 16 on the bottom of the limiting frame 15 and the internal pressure relief holes 18 on the bottom of the control panel 17 are exactly the same size. The movable shaft 19 can be rotated via the adjusting rods 21. During operation, the sealing gaskets 22 attached to the lower end of the adjusting rods 21 can cover the external pressure relief holes 16 on the bottom of the limiting frame 15.It can achieve a sealing effect, and by installing the internal pressure relief hole 18 and rotating the adjusting rod 21, it can effectively balance the air pressure during disassembly after use, facilitating the quick removal of the entire air-sealing device.

[0041] A coal mill external sealing mechanism and gas sealing device, comprising the following steps:

[0042] S1. The size of the installed sealing frame 1 is adjusted by the stretchable soft pad 4. The adjusted sealing frame 1 is then fitted onto the position of the device to facilitate the fixing of the sealing frame 1.

[0043] S2. Place the sealing ring 9 on the upper and lower auxiliary clamping frames 6 through the opening placement slots 8, rotate the movable buckle 10 to clamp and fix the sealing ring 9, and then twist the threaded rod 11 to keep the sealing ring 9 stable.

[0044] S3. Install and fix the fixing plate 12 through the threaded hole 13. After fixing, it can be fixed by turning the screw 14.

[0045] S4. Next, match the external pressure relief hole 16 in the limiting frame 15 with the internal pressure relief hole 18 on the operating table 17. The adjusting rod 21 can be adjusted and rotated through the installed movable shaft 19.

[0046] S5. Finally, rotate the rotating buckle 20 in the device through the movable shaft 19 installed below. This will block the sealing gasket 22 that is attached to the lower end of the adjusting rod 21 and the external pressure relief hole 16. Blocking will increase the air sealing effect of the device.

[0047] It should be noted that this invention is an external sealing mechanism and gas sealing device for a coal mill. In use, the sealing frame 1 is removed. After removal, the rubber ring 2 and the sealing ring 9 on the auxiliary clamping frame 6 that is engaged at both ends are inspected to prevent damage. When used again, the sealing frame 1 can be fitted to the position on the outside of the coal mill that needs to be sealed as needed. According to the different sizes of different sealing positions, the sealing frame 1 connected by the telescopic soft pad 4 is adjusted to a certain size. After adjustment, it can be installed and used to accommodate different sealing positions on the outside of different coal mills. After the installation is completed, the sealing effect can be further improved by fitting the sealing ring 9 on the placement groove 8 opened at the upper end of the auxiliary clamping frame 6, and it is fixed by the movable buckle 10. It also facilitates the maintenance and replacement of the sealing ring 9.

[0048] Secondly, when using the gas sealing device on the outside of the coal mill, the limiting frame 15, external pressure relief hole 16, operating platform 17 and internal pressure relief hole 18 installed on the coal mill are used. The number of external pressure relief holes 16 and internal pressure relief holes 18 at the bottom of the operating platform 17 are the same. The pressure relief holes can be blocked and fixed by the adjusting rod 21 installed on the operating platform 17. When the gas sealing device is in use, the operating platform 17, internal pressure relief hole 18, movable shaft 19, rotating buckle 20 and adjusting rod 21 are used. The rotating buckle 20 can rotate the adjusting rod 21 through the movable shaft 19. After rotation, the external pressure relief hole 16 can be blocked, which is convenient for operation and also convenient for controlling the use of the entire gas sealing device, thus improving the efficiency of use.

[0049] In use, the external pressure relief hole 16 at the bottom of the installed limiting frame 15 is exactly the same size as the internal pressure relief hole 18 at the bottom of the operating table 17. The movable shaft 19 can be rotated by the installed adjusting rod 21. During operation, the sealing gasket 22 attached to the lower end of the adjusting rod 21 can cover the external pressure relief hole 16 at the bottom of the limiting frame 15 to achieve a sealing effect. At the same time, by installing the internal pressure relief hole 18, the rotation of the adjusting rod 21 can effectively balance the air pressure when disassembling the device after use, making it easy to quickly remove the entire air sealing device. In this way, the external sealing mechanism and air sealing device of the coal mill are completed.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coal mill external sealing mechanism and gas sealing device, comprising a sealing frame (1), a rubber ring (2), a groove (3), a telescopic pad (4), a fixing hole (5), an auxiliary clamping frame (6), a fitting groove (7), a placement groove (8), a sealing ring (9), a movable buckle (10), a threaded rod (11), a fixing plate (12), a threaded hole (13), a screw (14), a limiting frame (15), an external pressure relief hole (16), an operating table (17), an internal pressure relief hole (18), a movable shaft (19), a rotating buckle (20), an adjusting rod (21), and a sealing gasket (22). The inner wall of the sealing frame (1) is fitted with a rubber ring (2). A groove (3) is provided in the middle of the sealing frame (1). A telescopic pad (4) is installed at one end of the groove (3). A fixing hole (5) is provided at the upper end of the sealing frame (1). An auxiliary clamping frame (6) is installed at the upper end of the fixing hole (5). A fitting groove (7) is provided at one end of the auxiliary clamping frame (6). The auxiliary clamping frame (6) has a placement groove (8) at its upper end, and a sealing ring (9) is installed at the upper end of the placement groove (8). Both ends of the auxiliary clamping frame (6) are equipped with movable buckles (10). A threaded rod (11) is connected through the upper end of the movable buckle (10). Threaded holes (13) are opened at the four corners of the fixed plate (12). A screw (14) is installed at one end of the threaded hole (13). A limiting frame (15) is fitted in the middle of the fixed plate (12). An external pressure relief hole (16) is opened at the bottom of the limiting frame (15). An operating table (17) is installed inside the limiting frame (15). An internal pressure relief hole (18) is opened at the bottom of the operating table (17). A movable shaft (19) is installed at the upper end of the operating table (17). A rotating buckle (20) is installed at the upper end of the movable shaft (19). An adjusting rod (21) is installed at the outer end of the rotating buckle (20). A sealing gasket (22) is attached to the lower end of the adjusting rod (21).

2. The external sealing mechanism and gas sealing device for a coal mill according to claim 1, characterized in that: The telescopic pad (4) is engaged with the sealing frame (1) through the slot (3), and the sealing frame (1) forms a telescopic structure through the telescopic pad (4).

3. The external sealing mechanism and gas sealing device for a coal mill according to claim 1, characterized in that: The auxiliary clamping frame (6) is engaged with the sealing frame (1) through the fixing hole (5), and the size of the auxiliary clamping frame (6) is smaller than the size of the sealing frame (1).

4. The external sealing mechanism and gas sealing device for a coal mill according to claim 1, characterized in that: The auxiliary clamping frame (6) is movably connected to the movable buckle (10), and the auxiliary clamping frame (6) is threadedly connected to the movable buckle (10) through the threaded rod (11).

5. The external sealing mechanism and gas sealing device for a coal mill according to claim 1, characterized in that: The auxiliary clamping frame (6) is symmetrically arranged with the central axis of the sealing frame (1), and the auxiliary clamping frame (6) is tightly fitted with the sealing ring (9).

6. The external sealing mechanism and gas sealing device for a coal mill according to claim 1, characterized in that: The limiting frame (15) is welded to the fixing plate (12), and the bottom of the limiting frame (15) is set with an opening.

7. The external sealing mechanism and gas sealing device for a coal mill according to claim 1, characterized in that: The bottom of the operating table (17) is open, and the operating table (17) forms a rotating structure with the rotating buckle (20) through the movable shaft (19).

8. The external sealing mechanism and gas sealing device for a coal mill according to claim 1, characterized in that: The rotating buckle (20) is welded to the movable shaft (19), and the rotating buckle (20) is distributed parallel to the operating table (17).

9. The external sealing mechanism and gas sealing device for a coal mill according to claim 1, characterized in that: The adjusting rods (21) are arranged in a ring array with rotating buckles (20), and the adjusting rods (21) are in close contact with the sealing gaskets (22).

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