A pneumatic plug door mounted in a vertical air duct
By installing purge pipes and purge holes inside the pneumatic slide-type isolation door housing, combined with a dust collection hopper and a dust storage tank, the problem of jamming caused by dust accumulation in the isolation door was solved, achieving efficient dust removal and improved equipment reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 国家能源集团泰州发电有限公司
- Filing Date
- 2025-07-31
- Publication Date
- 2026-06-26
AI Technical Summary
Existing pneumatic slide gate isolation doors are prone to dust accumulation in high-dust environments, leading to jamming and affecting equipment reliability. Furthermore, the existing dust removal device layout is unreasonable, resulting in a decrease in purging effect after long-term operation.
The isolation door box is equipped with circumferentially arranged purging pipes and radially evenly distributed purging holes. Combined with the dust collection hopper and ash storage tank, the dust is periodically purged by compressed air. Dust and impurities slide down to the ash storage tank by gravity and are discharged. The dust isolation door with concave and convex surface sealing ensures that the medium does not leak.
It achieves thorough purging of the isolation door enclosure, prevents jamming, improves equipment reliability and maintenance convenience, and has a high cost-performance ratio.
Smart Images
Figure CN224413419U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a pneumatic insert-type isolation door installed in a vertical air duct, belonging to the technical field of insert-type isolation doors. Background Technology
[0002] Pneumatic slide gate isolation doors are generally used in power plants and installed on pipelines with high air pressure, such as the hot primary air pipeline at the inlet of a coal mill. They are required to be fast and flexible in operation and reliable in sealing, and have both fully open and fully close functions, so as to cut off the flow of media.
[0003] Because the medium in the air duct contains a high amount of dust or impurities, and the pneumatic slide gate isolation door has a large structural size and operates continuously for a long time, dust and impurities will accumulate inside the isolation door box during operation. When the amount of dust and impurities accumulated on the movement track of the isolation door gate or the travel rod of its fully open and fully closed limit switch is large, it is easy to cause the isolation door to jam or the fully open and fully closed limit switch to fail to be triggered, thus affecting the reliability of equipment operation. In particular, if the pneumatic slide gate isolation door cannot close quickly to isolate the hot air when a coal mill experiences a coal shortage accident, it may cause the coal mill to catch fire or even explode, resulting in equipment damage.
[0004] To combat dust accumulation, pneumatic slide-in type isolation doors are now equipped with air purging devices to remove dust and impurities from inside the isolation doors.
[0005] Currently, the door panel housings of pneumatic slide-in type isolation doors are generally cylindrical or rectangular in shape and are relatively large in size. Using an air purging device can effectively remove dust and impurities in the initial stage of equipment operation and meet the operating requirements to a certain extent. However, there are two shortcomings: First, the layout of the purging pipes in the door panel housing is unreasonable, resulting in purging dead corners; second, because the door panel housing is isolated from the outside during operation, the dust and impurities purged by the device are not discharged outside the isolation door, but accumulate at the bottom of the housing. These two points lead to a continuous decline in the purging effect after long-term operation.
[0006] Therefore, in order to solve the above-mentioned technical problems, there is an urgent need for a pneumatic slide-type isolation door that can be installed in a vertical air duct and has a dust removal function. Utility Model Content
[0007] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a pneumatic slide-type isolation door installed in a vertical air duct, which can achieve the purpose of thoroughly blowing and cleaning the box, effectively prevent the pneumatic slide-type isolation door from jamming, is reliable and practical, easy to maintain, and has a high cost performance.
[0008] To achieve the above objectives / to solve the above technical problems, this utility model adopts the following technical solution:
[0009] A pneumatic slide-in type isolation door installed in a vertical air duct, comprising:
[0010] The isolation door housing has a channel for media flow on one side, and a door panel track is installed inside the isolation door housing.
[0011] The door panel is installed on the door panel track, and the isolation or flow of the medium is achieved by the linear reciprocating movement on the door panel track;
[0012] The purging piping is arranged circumferentially along the inner wall of the isolation door enclosure, and has purging hole groups evenly distributed in four radial directions. Each group includes multiple purging holes facing the door panel; and,
[0013] The dust collection hopper is fixedly connected to the bottom of the non-medium flow side of the isolation door box.
[0014] Furthermore, each group of purge holes includes at least four purge holes.
[0015] Furthermore, the purging pipeline is connected to a compressed air source, and a main purging valve and a branch purging valve are installed sequentially on the air supply pipeline from the air source toward the isolation door housing.
[0016] Furthermore, it also includes:
[0017] The door panel travel rod has its front end connected to the end of the door panel furthest from the medium flow side; and,
[0018] The stroke actuator cylinder is connected to the end of the door panel stroke rod and is used to drive the door panel to move linearly and reciprocally.
[0019] Furthermore, the diameter of the purging hole is 5mm.
[0020] Furthermore, the ash collection hopper includes:
[0021] The bucket body is connected to the bottom of the isolation door box; and,
[0022] Ash storage tank, flange connected to the bottom of the hopper outlet;
[0023] The four sides of the bucket body form acute angles with the horizontal plane.
[0024] Furthermore, the ash storage tank also includes:
[0025] The first collection hopper isolation door is movable and installed in the ash storage tank;
[0026] The second collection hopper isolation door is movably installed in the ash storage tank and located below the first collection hopper isolation door; and,
[0027] A transparent level gauge is installed on the surface of the ash storage tank, above the isolation door of the first collection hopper;
[0028] The first and second collection hopper isolation doors are sealed to the ash storage tank via concave and convex surfaces, dividing the ash storage tank into an upper ash tank and a lower ash tank with the same volume.
[0029] Furthermore, the angle between the side wall of the bucket and the horizontal plane is 20°.
[0030] Furthermore, the pressure parameter of the compressed air source is 0.75 MPa.
[0031] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:
[0032] The pneumatic insert-type isolation door provided by this utility model, installed in a vertical air duct, can periodically blow the inside of the isolation door through the blowing pipe and the blowing holes arranged on the blowing pipe. The blown dust and impurities are collected in the dust collection hopper and can be discharged from the outside of the door at any time, achieving the purpose of thoroughly blowing and cleaning the door. It effectively prevents the pneumatic insert-type isolation door from jamming. It is simple to manufacture, reliable and practical, easy to maintain, and has a high cost performance.
[0033] The pneumatic insert-type isolation door installed in the vertical air duct provided by this utility model has a blowing system with blowing sections distributed in four directions: the two sides of the travel track and the fully open and fully closed position of the door panel. The blowing sections are equipped with evenly distributed blowing holes, which can blow the travel track and the fully open and fully closed position of the door panel, thereby achieving a thorough blowing of the box without dead corners and a significant blowing effect.
[0034] The pneumatic slide-type isolation door installed in the vertical air duct provided by this utility model has a purging system that can achieve purging by simply operating the purging valve of this isolation door, which is convenient to operate and simple to use;
[0035] The pneumatic slide-type isolation door installed in the vertical air duct provided by this utility model has a dust removal system in which the side of the dust removal hopper forms a 20° angle with the horizontal plane of the box. Dust and impurities can slide down to the ash hopper by gravity and discharge the accumulated dust through the valve by operating the valve body, thus avoiding the decline in purging effect caused by the long-term accumulation of dust and impurities.
[0036] The pneumatic slide-type isolation door installed in the vertical air duct provided by this utility model has a dust removal system with a dust removal isolation door on the ash tank using a concave-convex surface seal. During operation, the medium in the air duct will not leak out through the dust removal isolation door. When the ash accumulation is serious, the dust removal isolation door can be opened for online dust removal, which effectively improves the reliability of equipment operation. Attached Figure Description
[0037] Figure 1 This is a top view schematic diagram of the structure of the pneumatic slide-type isolation door installed in the vertical air duct provided in this embodiment;
[0038] Figure 2 yes Figure 1 The diagram shows a side view of a pneumatic slide-type isolation door installed in a vertical air duct.
[0039] Figure 3 yes Figure 2 A three-dimensional schematic diagram of the structure of the ash collection hopper.
[0040] In the diagram: 1. Stroke actuator cylinder; 2. Door panel stroke rod; 3. Isolation door housing; 4. Purge pipeline; 5. Door panel track; 6. Door panel; 7. Purge hole; 8. Purge branch valve; 9. Purge main valve; 10. Ash collection hopper; 11. First collection hopper isolation door; 12. Second collection hopper isolation door; 13. Transparent level gauge; 14. Upper ash hopper; 15. Lower ash hopper. Detailed Implementation
[0041] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.
[0042] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and 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. Example 1
[0044] like Figures 1 to 3As shown, this embodiment provides a pneumatic slide-in type isolation door installed in a vertical air duct, including:
[0045] The isolation door housing 3 has a channel for medium flow on one side, and a door panel track 5 is installed inside the isolation door housing 3;
[0046] Door panel 6 is installed on door panel track 5, and the isolation or flow of the medium is achieved by linear reciprocating movement on door panel track 5;
[0047] A purge pipe 4 is arranged circumferentially along the inner wall of the isolation door housing 3, and purge hole groups are evenly distributed in four radial directions. Each group includes multiple purge holes 7 facing the door panel 6; and,
[0048] The dust collection hopper 10 is fixedly connected to the bottom of the non-medium flow side of the isolation door box 3.
[0049] In the above technical solution, the blowing pipe 4 and the blowing holes 7 arranged on the blowing pipe 4 on the isolation door box 3 can be used to regularly blow the inside of the box. The dust and impurities blown out are collected in the dust collection hopper and can be discharged from the outside of the box at any time, so as to achieve the purpose of thoroughly blowing and cleaning the box and effectively prevent the pneumatic insert type isolation door from jamming. Example 2
[0050] like Figures 1 to 3 As shown, the pneumatic slide-in type isolation door installed in a vertical air duct provided in this embodiment differs from the pneumatic slide-in type isolation door installed in a vertical air duct provided in Embodiment 1 in that:
[0051] To ensure the purging effect, each group of purging holes includes at least four purging holes 7.
[0052] To supply air to the purging pipeline 4, the purging pipeline 4 is connected to a compressed air source. A main purging valve 9 and a branch purging valve 8 are installed sequentially on the air supply pipeline from the air source toward the isolation door housing 3.
[0053] To enable the drive of door panel 6, the following also includes:
[0054] Door panel travel rod 2, the front end of which is connected to the end of door panel 6 away from the medium flow side; and,
[0055] The stroke actuator cylinder 1 is connected to the end of the door panel stroke rod 2 and is used to drive the door panel 6 to move linearly and reciprocally.
[0056] In this embodiment, the diameter of the purge hole 7 is 5mm.
[0057] To collect the swept dust, the dust collection hopper 10 includes:
[0058] The bucket body is connected to the bottom of the isolation door box 3; and,
[0059] The ash storage tank is connected to the bottom of the hopper outlet via a flange;
[0060] The four sides of the hopper form acute angles with the horizontal plane, allowing dust and impurities to slide down the sides by gravity and eventually collect in the ash storage tank.
[0061] To achieve dust collection, the ash storage tank further includes:
[0062] The first collection hopper isolation door 11 is movablely installed in the ash storage tank;
[0063] The second collection hopper isolation door 12 is movably installed in the ash storage tank and is located below the first collection hopper isolation door 11; and,
[0064] A transparent level gauge 13 is installed on the surface of the ash storage tank, above the isolation door 11 of the first collection hopper;
[0065] The first collection hopper isolation door 11 and the second collection hopper isolation door 12 are sealed to the ash storage tank through concave and convex surfaces, dividing the ash storage tank into an upper ash tank 14 and a lower ash tank 15 with the same volume.
[0066] The angle between the side wall of the bucket and the horizontal plane is 20°.
[0067] Specifically, this embodiment provides a pneumatic slide-in type isolation door installed in a vertical air duct and its blowing and dust removal device, such as... Figures 1 to 3 As shown, it mainly consists of several parts: stroke actuator cylinder 1, door plate stroke rod 2, isolation door housing 3, purging pipeline 4, door plate track 5, door plate 6, purging hole 7, purging branch valve 8, purging main valve 9, dust collection hopper 10, first collection hopper isolation door 11, and second collection hopper isolation door 12.
[0068] The pneumatic slide-in type isolation door's stroke actuator cylinder 1 pulls the door panel 6 back and forth along the door panel track 5 via the door panel stroke rod 2, thereby realizing the opening and closing of the isolation door;
[0069] The purging system uses compressed air at approximately 0.75 MPa. The air enters the purging pipeline 4, which is arranged around the perimeter of the housing, through the main purging valve 9 and the branch purging valve 8. The air then flows through different purging holes 7 to purge different parts of the isolation door. The pipeline has four symmetrically arranged purging holes on each side of the track to purge both sides of the track. Four symmetrically arranged purging holes are also arranged at the front and rear ends of the isolation door housing 3 to purge the valve in both fully open and fully closed positions.
[0070] The isolation door travel mechanism and purging system are installed inside the isolation door housing 3;
[0071] When the isolation door is installed on the air duct, the dust and impurities removed by the purging system on one side of the air duct enter the air duct with the medium and are discharged, while the dust and impurities on the actuator side are collected and enter the dust collection system. Figure 3 As shown, the dust collection hopper 10 is connected to the isolation door box 3 as a whole. Its side forms a 20° angle with the horizontal plane of the isolation door box 3. Dust and impurities can slide down the side by gravity and eventually collect in the cylindrical ash storage tank below the funnel. The ash storage tank is equipped with two normally closed first isolation doors 11 and second collection hopper isolation doors 12. The ash storage tank is equipped with a transparent level gauge 13 to facilitate observation of the ash storage status at any time. During specific dust cleaning, when the ash storage height reaches the upper limit of the level gauge, it is confirmed that the second collection hopper isolation door 12 is closed. Then, the first collection hopper isolation door 11 is opened to put the ash from the upper ash tank 14 to the lower ash tank 15. Then, the first collection hopper isolation door 11 is closed, the second collection hopper isolation door 12 is opened, and the ash from the lower ash tank 15 is put into the trolley for collection and transportation to the garbage bin. Finally, the isolation door 12 is closed.
[0072] In summary, this embodiment incorporates a purging system (including purging pipes 4, valves (purging branch valves 8 and purging main valve 9), and purging holes 7) on the isolation door housing 3, along with a door mechanism (door panel 6, stroke actuator cylinder 1, and door panel stroke rod 2) that slides through the door panel track 5. The dust removal system is connected to the housing. By controlling the purging valves (purging branch valves 8 and purging main valve 9) and the door panel 6 via the stroke actuator cylinder 1, purging is performed periodically. The purged dust and impurities are collected in the dust collection hopper (dust collection hopper 10) and can be discharged from the housing at any time, achieving the purpose of thorough purging and dust removal of the housing. This effectively prevents the pneumatic slide-in isolation door from jamming. The system is simple to manufacture, reliable, practical, easy to maintain, and has a high cost-performance ratio.
[0073] The blowing system in this embodiment has blowing sections distributed in four directions: the two sides of the travel track 5 and the door panel 6 at the fully open and fully closed positions. The blowing sections are equipped with evenly distributed blowing holes 7, which can blow the travel track 5 and the door panel 6 at the fully open and fully closed positions, thereby achieving blowing without dead angles inside the box and achieving a significant blowing effect.
[0074] The purging system in this embodiment can achieve purging simply by operating the purging valves (purging branch valve 8 and purging main valve 9) of this isolation door, making it convenient and easy to use.
[0075] In this embodiment, the side of the dust removal hopper of the dust removal system forms a 20° angle with the horizontal plane of the box. Dust and impurities can slide down to the ash hopper (upper ash hopper 14, lower ash hopper 15) by gravity. The accumulated dust is discharged from the valve body by operating the generating valve, thus avoiding the decline in purging effect caused by long-term accumulation of dust and impurities.
[0076] The dust removal system in this embodiment is equipped with dust removal isolation doors (first collection hopper isolation door 11 and second collection hopper isolation door 12) with concave and convex sealing on the ash hoppers (upper ash hopper 14 and lower ash hopper 15). During operation, the medium in the air duct will not leak out through the dust removal isolation doors. When the ash accumulation is serious, the dust removal isolation doors can be opened for online dust removal, which effectively improves the reliability of equipment operation.
[0077] The dust removal method provided in this embodiment controls the sequential operation of two dust removal isolation doors (first collection hopper isolation door 11 and second collection hopper isolation door 12) to effectively isolate the ash tank from the box throughout the dust removal process, ensuring that the medium in the air duct will not leak out. The method is simple to operate and improves the safety of operators.
[0078] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. An air-activated plug door for installation in a vertical air duct, characterized in that include: The isolation door housing (3) has a channel for medium flow on one side, and a door panel track (5) is installed inside the isolation door housing (3). The door panel (6) is installed on the door panel track (5) and the isolation or flow of the medium is achieved by the linear reciprocating movement on the door panel track (5); A purge pipe (4) is arranged circumferentially along the inner wall of the isolation door enclosure (3), and purge hole groups are opened in four radially evenly distributed directions. Each group includes multiple purge holes (7) facing the door panel (6); and, The dust collection hopper (10) is fixedly connected to the bottom of the non-medium flow side of the isolation door box (3).
2. The pneumatic slide-in type isolation door installed in a vertical air duct according to claim 1, characterized in that, Each purge hole group includes at least four purge holes (7).
3. The pneumatic slide-in type isolation door installed in a vertical air duct according to claim 1, characterized in that, The purging pipeline (4) is connected to a compressed air source. A purging main valve (9) and a purging branch valve (8) are installed sequentially from the air source toward the isolation door box (3) on the air supply pipeline.
4. The pneumatic slide-in type isolation door installed in a vertical air duct according to claim 1, characterized in that, Also includes: The door panel travel rod (2) has its front end connected to the end of the door panel (6) away from the medium flow side; and, The stroke execution cylinder (1) is connected to the end of the door panel stroke rod (2) and is used to drive the door panel (6) to move linearly back and forth.
5. The pneumatic slide-in type isolation door installed in a vertical air duct according to claim 1, characterized in that, The diameter of the purge hole (7) is 5 mm.
6. The pneumatic slide-in type isolation door installed in a vertical air duct according to claim 1, characterized in that, The ash collection hopper (10) includes: The bucket body is connected to the bottom of the isolation door box (3); and, Ash storage tank, flange connected to the bottom of the hopper outlet; The four sides of the bucket body form acute angles with the horizontal plane.
7. The pneumatic slide-in type isolation door installed in a vertical air duct according to claim 6, characterized in that, The ash storage tank also includes: The first collection hopper isolation door (11) is movablely installed in the ash storage tank; and, The second collection hopper isolation door (12) is movably installed in the ash storage tank and is located below the first collection hopper isolation door (11); The first collection hopper isolation door (11) and the second collection hopper isolation door (12) are sealed with the ash storage tank through concave and convex surfaces, dividing the ash storage tank into an upper ash tank (14) and a lower ash tank (15) with the same volume.
8. The pneumatic slide-in type isolation door installed in a vertical air duct according to claim 6 or 7, characterized in that, The angle between the side wall of the bucket and the horizontal plane is 20°.
9. The pneumatic slide-in type isolation door installed in a vertical air duct according to claim 6, characterized in that, Also includes: A transparent level gauge (13) is installed on the surface of the ash storage tank, above the isolation door (11) of the first collection hopper.
10. The pneumatic slide-in type isolation door installed in a vertical air duct according to claim 3, characterized in that, The pressure parameter of the compressed air source is 0.75 MPa.