Airtight ash leakage prevention device of ash valve

Abstract

The utility model relates to the technical field of circulating fluidized bed boilers, in particular to an airtight ash leakage prevention device for an ash valve, which comprises a valve body mounted on the outer wall of the valve body, a valve plate movably arranged in the valve body and used for controlling the on-off of the valve body, and an airtight cavity and a connecting cavity sequentially arranged in the valve body from one end close to the valve body to the direction far away from the valve body. The middle of the valve plate is movably arranged in the airtight cavity, one end of the valve plate penetrates into the valve body through the first valve plate hole, the other end of the valve plate penetrates into the connecting cavity through the second valve plate hole, a push rod is connected into the connecting cavity, and the end, away from the valve plate, of the push rod is connected with a lead screw driving assembly used for driving the push rod to do axial linear motion. The airtight cavity is filled with heat preservation cotton, and the connecting cavity is connected with external air supply equipment through an air supply pipe. The problem that in the prior art, in the moving process of a valve plate of a manual ash valve, high-temperature ash is leaked into the surrounding environment or enters the position of a lead screw, and smooth work of the lead screw is affected is solved.

Description

Technical Field

[0001] This utility model relates to the field of circulating fluidized bed boiler technology, specifically to an airtight ash leakage prevention device for ash valves. Background Technology

[0002] The development and application of circulating fluidized bed boiler technology have been widely adopted. This technology is one of the advanced technologies for clean coal combustion and achieving sustainable development strategies. It integrates advantages such as energy saving, clean combustion, safety and reliability, and reduced pollution emissions.

[0003] Since circulating fluidized bed boilers use coal as their energy source, a large amount of high-temperature ash is produced after combustion. This high-temperature ash is discharged through ash discharge pipes, ash valves, and other equipment to a ash cooler for cooling and then transported to downstream equipment. During the daily operation of the circulating fluidized bed boiler, depending on the project requirements, the ash valve needs to be closed for maintenance or repair of the ash cooler and downstream equipment. Depending on the project, this may need to be done several times a month. Currently, an electric hammer valve is generally used to seal the ash discharge port of the ash valve. However, for safety reasons, to prevent the electric hammer valve from not closing tightly and causing ash to fall during cleaning, posing a safety threat to personnel below, a manual ash valve is usually installed on the valve body below the ash valve. After closing the electric hammer valve, the manual ash valve is manually closed, providing a double safety measure. For example, our company previously applied for a patent, application number CN201620328657.5, entitled "A High-Temperature Insulated Ash Valve." This application uses a manual valve to control the valve plate to close and open the valve body. While this design effectively prevents ash and slag from falling downwards when the valve body is closed, the sealing packing or other seals at the connection between the valve plate and the valve body will gradually fail after prolonged use. This can cause the valve plate to leak hot ash and slag into the surrounding environment during opening and closing, and even into the lead screw. On the one hand, a large amount of ash and slag leakage will pollute the environment and may cause safety hazards to the operators below. On the other hand, ash and slag adhering to the surface of the lead screw will affect the rotation of the lead screw and cause jamming problems. Utility Model Content

[0004] The purpose of this utility model is to provide an airtight ash leakage prevention device for ash valves, which solves the problem in the prior art that the valve plate of a manual ash valve will carry high-temperature ash and slag into the environment during operation, or enter the position of the lead screw, affecting the smooth operation of the lead screw.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A leak-proof ash valve includes a valve body support mounted on the outer wall of the valve body. A valve plate for controlling the opening and closing of the valve body is movably disposed within the valve body support. An airtight cavity and a connecting cavity are sequentially arranged within the valve body support from the end closest to the valve body to the end furthest from the valve body. The airtight cavity is connected to the valve body through a first valve plate hole, and the airtight cavity is connected to the connecting cavity through a second valve plate hole. The middle part of the valve plate is movably disposed within the airtight cavity. One end of the valve plate passes through the first valve plate hole into the valve body, and the other end passes through the second valve plate hole into the connecting cavity. A push rod is connected within the connecting cavity. The end of the push rod furthest from the valve plate is connected to a screw drive assembly for driving the push rod to perform axial linear movement. The airtight cavity is filled with insulation cotton, and the connecting cavity is connected to an external air supply device via an air supply pipe.

[0007] A further technical solution is to provide packing inside the first valve plate hole for sealing the gap between the first valve plate hole and the valve plate.

[0008] A further technical solution is that the airtight cavity is equipped with rollers that fit the surface of the valve plate on both the upper and lower sides of the valve plate.

[0009] A further technical solution is that the lead screw drive assembly includes a lead screw, a threaded sleeve, and a drive handle. The valve body has a drive chamber on the side of the connecting cavity away from the airtight cavity. The connecting cavity is connected to the drive chamber through a sliding hole. One end of the push rod is connected to the valve plate in the connecting cavity, and the other end passes through the sliding hole and is coaxially connected to the lead screw in the drive chamber. The side of the drive chamber away from the connecting cavity is connected to the end of the valve body bracket away from the valve body through a mounting hole. The threaded sleeve is rotatably installed in the mounting hole. The lead screw passes into the threaded sleeve and is threadedly matched with the threaded sleeve. The drive handle is fixedly connected to the outer wall of the threaded sleeve outside the valve body bracket.

[0010] A further technical solution is to have a bearing fitted on the outer wall of the threaded sleeve, and the outer wall of the bearing is fixedly connected to the wall of the mounting hole.

[0011] A further technical solution is that an air supply sleeve is installed in the connecting cavity at the position of the sliding hole. The air supply sleeve is fitted on the outer wall of the push rod, and there is a gap between the inner wall of the air supply sleeve and the outer wall of the push rod. The inner wall of the air supply sleeve is provided with multiple air blowing holes, which are connected to the external air supply equipment through the air supply pipe. The holes of the air blowing holes are inclined from the outside to the inside towards the airtight cavity.

[0012] A further technical solution is that the wall of the sliding hole is sealed to the outer wall of the push rod by a sealing ring; the upper and lower sides of the valve body bracket are provided with cleaning ports that communicate with the connecting cavity, as well as sealing pressure plates for closing the cleaning ports.

[0013] A further technical solution is that the push rod is connected to the valve plate via a connecting block. One side of the connecting block is fixedly connected to the end of the push rod via an mounting ring, and the other side is provided with a fixing groove. The end of the valve plate facing the push rod is locked in the fixing groove and fixed by bolts. A circular hole parallel to the axial direction of the push rod is provided through the edge of the connecting block. A guide rod is slidably provided inside the circular hole. The two ends of the guide rod are fixedly connected to the cavity walls on opposite sides of the connecting cavity.

[0014] A further technical solution is that the lower side of the valve body has a strip-shaped hole connected to the drive cavity along the axial direction of the push rod at the position of the drive cavity, and a strip-shaped scale is provided on the lower side of the valve body at the edge of the strip-shaped hole. The push rod is connected to a pointer in the drive cavity, and the lower end of the pointer passes through the strip-shaped hole and exits the drive cavity, and is placed below the valve body. The valve body is provided with a protective sleeve for covering the lead screw at the position of the mounting hole.

[0015] Compared with existing technologies, the beneficial effects of this utility model are: 1. By setting an airtight cavity, the insulation cotton filled inside the airtight cavity can prevent the valve plate from carrying ash and slag into the connecting cavity during movement; 2. By setting an air supply pipe and an external air supply device, air can be supplied into the connecting cavity to create a positive pressure state. This allows the gas in the connecting cavity to enter the airtight cavity through the second valve plate hole, thus preventing ash and slag from entering the connecting cavity under positive pressure. Furthermore, as the gas enters the airtight cavity, a small amount of gas will enter the valve body through the first valve plate hole, further preventing ash and slag from entering the airtight cavity during gas flow. Multiple layers of protection prevent ash and slag from entering the connecting cavity. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an airtight ash leakage prevention device for ash valves according to this utility model.

[0017] Figure 2 This is a side cross-sectional view of an airtight ash leakage prevention device for ash valves according to this utility model.

[0018] Figure 3 This is a top view sectional diagram of an airtight ash leakage prevention device for an ash valve according to the present invention.

[0019] Figure 4 for Figure 2 A magnified view of the area marked A in the middle.

[0020] Figure 5 for Figure 2 A magnified view of the area marked B.

[0021] Icons: 1-Valve body, 2-Valve body bracket, 3-Valve plate, 4-Airtight cavity, 5-Connecting cavity, 6-First valve plate hole, 7-Second valve plate hole, 8-Push rod, 9-Air supply pipe, 10-Packing, 11-Roller, 12-Lead screw, 13-Threaded sleeve, 14-Drive handle, 15-Drive cavity, 16-Sliding hole, 17-Mounting hole, 18-Bearing, 19-Air supply sleeve, 20-Blowing hole, 21-Sealing ring, 22-Cleaning port, 23-Sealing pressure plate, 24-Connecting block, 25-Mounting ring, 26-Fixing groove, 27-Bolt, 28-Round hole, 29-Guide round rod, 30-Strip hole, 31-Strip scale, 32-Pointer, 33-Protective sleeve, 34-Sleeve, 35-Buffer groove. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] Example:

[0024] A leak-proof ash valve includes a valve body bracket 2 mounted on the outer wall of a valve body 1. A valve plate 3 for controlling the opening and closing of the valve body 1 is movably disposed within the valve body bracket 2. An airtight cavity 4 and a connecting cavity 5 are sequentially arranged within the valve body bracket 2 from the end closest to the valve body 1 to the end furthest from the valve body 1. The airtight cavity 4 is connected to the valve body 1 through a first valve plate hole 6 and to the connecting cavity 5 through a second valve plate hole 7. The middle part of the valve plate 3 is movably disposed within the airtight cavity 4. One end of the valve plate 3 passes through the first valve plate hole 6 into the valve body 1, and the other end passes through the second valve plate hole 7 into the connecting cavity 5. A push rod 8 is connected within the connecting cavity 5. The end of the push rod 8 furthest from the valve plate 3 is connected to a screw drive assembly for driving the push rod 8 to perform axial linear movement. The airtight cavity 4 is filled with insulation cotton, and the connecting cavity 5 is connected to an external air supply device through an air supply pipe 9. By setting up an airtight cavity 4, the insulation cotton filled inside the airtight cavity 4 can prevent the valve plate 3 from carrying ash and slag into the connecting cavity 5 during movement. By setting up an air supply pipe 9 and an external air supply device, air can be supplied into the connecting cavity 5 to create a positive pressure state. This allows the gas in the connecting cavity 5 to enter the airtight cavity 4 through the second valve plate hole 7, thus preventing ash and slag from entering the connecting cavity 5 during gas flow. Furthermore, as the gas enters the airtight cavity 4, it also enters the valve body 1 through the first valve plate hole 6, further preventing ash and slag from entering the airtight cavity 4 during gas flow. Multiple layers of protection prevent ash and slag from entering the connecting cavity 5. Figure 2As shown, at the connection between valve body 1 and valve body support 2, a sleeve 34 is provided on the outside of valve body 1. The diameter of sleeve 34 is larger than the diameter of valve body. The valve body is cut off at the position corresponding to valve plate 3 and connected through sleeve 34. Sleeve 34 is provided with a buffer groove 35 for accommodating valve plate 3 at the cut position of valve body 1. When valve plate 3 is inserted into the cut position of valve body 1 to block valve body 1, the edge of valve plate 3 extends into buffer groove 35.

[0025] A packing 10 is provided inside the first valve plate hole 6 to seal the gap between the first valve plate hole 6 and the valve plate 3. By providing the packing 10, the gap between the first valve plate hole 6 and the valve plate 3 can be sealed, preventing a large amount of ash and slag from entering the airtight cavity 4 as the valve plate 3 moves.

[0026] The airtight cavity 4 is provided with rollers 11 on both the upper and lower sides of the valve plate 3, which are in contact with the surface of the valve plate 3. By providing rollers 11, the upper and lower sides of the valve plate 3 can be supported. Compared with the traditional structure, the length of the valve plate 3 will increase due to the addition of the airtight cavity 4. In order to avoid the middle of the valve plate 3 being recessed, rollers 11 are used to support the valve plate 3. Two or more rollers 11 are provided on both the upper and lower sides of the valve plate 3.

[0027] The lead screw 12 drive assembly includes a lead screw 12, a threaded sleeve 13, and a drive handle 14. The valve body bracket 2 has a drive chamber 15 on the side of the connecting cavity 5 away from the airtight cavity 4. The connecting cavity 5 is connected to the drive chamber 15 through a sliding hole 16. One end of the push rod 8 is connected to the valve plate 3 in the connecting cavity 5, and the other end passes through the sliding hole 16 and is coaxially connected to the lead screw 12 in the drive chamber 15. The side of the drive chamber 15 away from the connecting cavity 5 is connected to the end of the valve body bracket 2 away from the valve body 1 through a mounting hole 17. The threaded sleeve 13 is rotatably installed in the mounting hole 17. The lead screw 12 passes into the threaded sleeve 13 and is threadedly matched with the threaded sleeve 13. The drive handle 14 is fixedly connected to the outer wall of the threaded sleeve 13 on the outside of the valve body bracket 2. With this setup, when the valve body 1 needs to be closed via the valve plate 3, the operator rotates the drive handle 14. The drive handle 14 rotates the threaded sleeve 13, which in turn drives the lead screw 12 to move linearly along the axial direction via threaded transmission. The lead screw 12 then drives the push rod 8 to move linearly, thereby controlling the valve plate 3 to penetrate into the valve body 1 and seal the valve. To open the valve, simply rotate the drive handle 14 in the opposite direction.

[0028] A bearing 18 is fitted onto the outer wall of the threaded sleeve 13, and the outer wall of the bearing 18 is fixedly connected to the wall of the mounting hole 17. By providing the bearing 18, the smoothness of rotation between the threaded sleeve 13 and the mounting hole 17 can be improved.

[0029] An air supply sleeve 19 is installed in the connecting cavity 5 at the position of the sliding hole 16. The air supply sleeve 19 is sleeved on the outer wall of the push rod 8, and a gap is left between the inner wall of the air supply sleeve 19 and the outer wall of the push rod 8. The inner wall of the air supply sleeve 19 is provided with multiple air blowing holes 20, which are connected to an external air supply device through the air supply pipe 9. The holes of the air blowing holes 20 are inclined from the outside to the inside towards the airtight cavity 4. By setting the air supply sleeve 19, the direction and position of the gas in the air supply pipe 9 entering the connecting cavity 5 can be determined. Since the push rod 8 will reciprocate into the drive cavity 15 when the valve plate 3 is switched on and off, in order to prevent the ash and slag in the connecting cavity 5 from entering the drive cavity 15, the surface of the push rod 8 is blown off by the air blowing holes 20 of the air supply sleeve 19.

[0030] The wall of the sliding hole 16 is sealed to the outer wall of the push rod 8 by a sealing ring 21; the upper and lower sides of the valve body bracket 2 are provided with cleaning ports 22 that communicate with the connecting cavity 5, and sealing pressure plates 23 for closing the cleaning ports 22. By setting the sealing ring 21, the gap between the sliding hole 16 and the push rod 8 can be sealed, so that almost all the gas entering the air supply sleeve 19 from the air blowing hole 20 will be blown towards the connecting cavity 5.

[0031] The push rod 8 is connected to the valve plate 3 via a connecting block 24. One side of the connecting block 24 is fixedly connected to the end of the push rod 8 via a mounting ring 25, and the other side is provided with a fixing groove 26. The end of the valve plate 3 facing the push rod 8 is engaged in the fixing groove 26 and fixed by bolts 27. A circular hole 28 parallel to the axial direction of the push rod 8 is provided through the edge of the connecting block 24. A guide rod 29 is slidably arranged inside the circular hole 28, and the two ends of the guide rod 29 are fixedly connected to the cavity walls on opposite sides of the connecting cavity 5. The connecting block 24, through the mounting ring 25 and the fixing groove 26, can stably connect the push rod 8 and the valve plate 3 together. By providing the circular hole 28 and the guide rod 29, the edge of the connecting block 24 can be supported and guided.

[0032] A strip-shaped hole 30 communicating with the drive cavity 15 is provided on the lower side of the valve body bracket 2 along the axial direction of the push rod 8 at the position of the drive cavity 15. A strip scale 31 is provided on the lower side of the valve body bracket 2 at the edge of the strip-shaped hole 30. A pointer 32 is connected to the push rod 8 inside the drive cavity 15. The lower end of the pointer 32 passes through the strip-shaped hole 30 and exits the drive cavity 15, and is placed below the valve body bracket 2. A protective sleeve 33 for covering the lead screw 12 is provided on the valve body bracket 2 at the position of the mounting hole 17. In order to facilitate the judgment of whether the valve plate 3 blocks the valve body 1, the displacement distance of the push rod 8 can be intuitively judged by the pointer 32 in conjunction with the strip scale 31. By setting displacement distance scale lines and fully open and fully closed scale lines on the strip scale 31, it is easy for the operator to intuitively judge whether the valve plate 3 is fully open or closed. By setting the protective sleeve 33, the part of the lead screw 12 that extends outside the valve body bracket 2 when it drives the valve plate 3 to retract into the valve body bracket 2 can be protected.

[0033] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. An ash valve airtight ash leakage prevention device, comprising a valve body support (2) installed on the outer wall of a valve body (1), a valve plate (3) for controlling the opening and closing of the valve body (1) is movably arranged in the valve body support (2), characterized in that, The valve body support (2) is provided with airtight cavity (4) and connecting cavity (5) from the end close to the valve body (1) to the end away from the valve body (1), the airtight cavity (4) is communicated with the valve body (1) through the first valve plate hole (6), the airtight cavity (4) is communicated with the connecting cavity (5) through the second valve plate hole (7), the middle part of the valve plate (3) is movably arranged in the airtight cavity (4), one end of the valve plate (3) is inserted into the valve body (1) through the first valve plate hole (6), the other end is inserted into the connecting cavity (5) through the second valve plate hole (7), and the push rod (8) is connected in the connecting cavity (5), one end of the push rod (8) is connected with the screw rod driving assembly for driving the push rod (8) to move linearly in the axial direction.

2. An ash valve airtight ash leakage preventing device according to claim 1, characterized in that: The first valve plate hole (6) is provided with a packing (10) for sealing the gap between the first valve plate hole (6) and the valve plate (3).

3. An ash valve airtight ash leakage preventing device according to claim 1, characterized in that: The airtight cavity (4) is provided with a roller (11) on the upper and lower sides of the valve plate (3) and is attached to the surface of the valve plate (3).

4. An ash valve airtight ash leakage preventing device according to claim 1, characterized in that: The screw rod (12) driving assembly comprises a screw rod (12), a threaded sleeve (13) and a driving handle (14), the valve body support (2) is provided with a driving cavity (15) on the side away from the airtight cavity (4) of the connecting cavity (5), the connecting cavity (5) is communicated with the driving cavity (15) through the sliding hole (16), one end of the push rod (8) is connected with the valve plate (3) in the connecting cavity (5), the other end passes through the sliding hole (16) and is coaxially connected with the screw rod (12) in the driving cavity (15), the side away from the connecting cavity (5) of the driving cavity (15) is communicated with the end away from the valve body (1) of the valve body support (2) through the mounting hole (17), the threaded sleeve (13) is rotatably mounted in the mounting hole (17), the screw rod (12) is inserted into the threaded sleeve (13) and is connected with the threaded sleeve (13) in threaded matching, and the driving handle (14) is fixedly connected with the outer wall of the threaded sleeve (13) outside the valve body support (2).

5. An ash valve airtight ash leakage preventing device according to claim 4, characterized in that: The outer wall of the threaded sleeve (13) is sleeved with a bearing (18), and the outer wall of the bearing (18) is fixedly connected with the hole wall of the mounting hole (17).

6. An ash valve airtight ash leakage preventing device according to claim 4, characterized in that: The connecting cavity (5) is provided with a gas supply sleeve (19) at the position of the sliding hole (16), the gas supply sleeve (19) is sleeved on the outer wall of the push rod (8), and a gap is left between the inner wall of the gas supply sleeve (19) and the outer wall of the push rod (8), the inner wall of the gas supply sleeve (19) is provided with a plurality of air blowing holes (20), and the air blowing holes (20) are connected with the external gas supply equipment through the gas supply pipe (9); the hole of the air blowing hole (20) is inclined from outside to inside towards the airtight cavity (4).

7. An ash valve airtight ash leakage preventing device according to claim 4, characterized in that: The hole wall of the sliding hole (16) is sealed and matched with the outer wall of the push rod (8) through a sealing ring (21); the upper and lower sides of the valve body support (2) are both provided with a cleaning port (22) communicated with the connecting cavity (5) and a sealing pressing plate (23) for closing the cleaning port (22).

8. An ash valve airtight ash leakage preventing device according to claim 4, characterized in that: The push rod (8) is connected with the valve plate (3) through a connecting block (24), one side of the connecting block (24) is fixedly connected with the end of the push rod (8) through a mounting ring (25), the other side is provided with a fixing groove (26), one end of the valve plate (3) facing the push rod (8) is clamped in the fixing groove (26) and is fixed through a bolt (27); the edge position of the connecting block (24) is provided with a circular hole (28) axially parallel to the push rod (8), a guide circular rod (29) is slidably arranged in the circular hole (28), and both ends of the guide circular rod (29) are fixedly connected with the cavity walls of the connecting cavities (5) on opposite sides.

9. An ash valve airtight ash leakage preventing device according to claim 4, characterized in that: The lower side of the valve body support (2) is provided with a strip-shaped hole (30) communicated with the driving cavity (15) along the axial direction of the push rod (8) at the position of the driving cavity (15), the lower side of the valve body support (2) is provided with a strip-shaped scale (31) at the edge of the strip-shaped hole (30), the push rod (8) is connected with a pointer (32) in the driving cavity (15), the lower end of the pointer (32) passes out of the driving cavity (15) through the strip-shaped hole (30) and is placed below the valve body support (2); the valve body support (2) is provided with a protection cylinder (33) for covering the lead screw (12) at the position of the mounting hole (17).

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