Flue gas baffle valve

Abstract

The utility model provides a flue gas baffle valve which is a novel flue gas baffle door with double-layer mechanical sealing and air-entrapping sealing, can ensure that blades are opened and closed freely and are not blocked when blade shafts of the baffle door are vertically arranged, has safe and reliable sealing performance, and is a flue gas baffle door which is better suitable for CO removal control. Comprising a blade, a frame and a shaft, the shaft is vertically arranged so that the blade can be rotatably installed in the frame, the blade is of a double-layer structure, when the blade is in a closed state, the double-layer structure of the blade comprises a first plate face and a second plate face, and the two plate faces and the inner circumferential side face of the frame form sealing; the inner surfaces of the two plate surfaces and the inner circumferential side surface of the frame are encircled to form a sealed space; a sealing air connector is formed in the frame and used for introducing compressed air into the sealing space to form air sealing.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a flue gas damper valve. Background Technology

[0002] Flue gas dampers are mainly used for flow regulation and closure in flue gas ducts of coal-fired power plants, steel plants, etc. Usually, the blade shafts of the dampers are arranged horizontally. In special cases, due to space constraints, the blade shafts of the flue gas dampers need to be arranged vertically. In this case, flue gas dampers are prone to bearing bursting, blade jamming, and other failures in actual use. The sealing performance cannot be guaranteed, resulting in flue gas leakage and potentially causing quality and safety accidents.

[0003] Currently, according to CO emission requirements, some steel plants need to remove CO. This requires highly airtight flue gas dampers in the flue gas system. CO removal device flue ducts are often large in cross-section and flat in shape. If the flue gas dampers are arranged conventionally, with the damper blades horizontally, the blade shafts would be over 10 meters long, making manufacturing, processing, and installation extremely difficult, and the sealing performance could not be guaranteed. Therefore, the flue gas damper blades for CO removal control need to be vertically arranged and have extremely high sealing performance to ensure no flue gas leakage. Utility Model Content

[0004] Based on the above-mentioned technological status, this utility model provides a flue gas damper valve, a novel flue gas damper door with a double-layer mechanical seal and gas seal, which can ensure that when the damper door blade shaft is arranged vertically, the blades can open and close freely without jamming, and the sealing performance is safe and reliable. It is a flue gas damper door that is better suited for CO removal control.

[0005] The technical solution adopted by this utility model is as follows: A flue gas damper valve includes blades, a frame, and a shaft. The shaft is vertically arranged to rotatably install the blades within the frame. The blades have a double-layer structure. When the blades are in the closed state, the double-layer structure of the blades includes a first plate surface and a second plate surface. Both plate surfaces form a seal with the inner peripheral side surface of the frame, and the inner surfaces of the two plate surfaces and the inner peripheral side surface of the frame surround a sealed space. A sealing air inlet is provided on the frame, which is used to introduce compressed air into the sealed space to form an airtight seal.

[0006] An elastic sheet is fixedly installed on the side of the frame corresponding to the closed position of the blade. When the blade is closed, the elastic sheet elastically deforms and adheres to the first plate surface, forming a seal between the side of the first plate surface and the frame. A U-shaped elastic tube is fixedly installed on the side of the second plate surface or the side of the frame. When the blade is closed, the U-shaped elastic tube elastically deforms and abuts against the frame or the side of the second plate surface, forming a seal between the side of the second plate surface and the frame.

[0007] The upper inner surface of the frame is provided with two elastic sealing strips. When the blades are closed, the two elastic sealing strips contact and seal with the upper end surfaces of the first plate and the second plate, respectively. The lower inner surface of the frame is also provided with two elastic sealing strips. When the blades are closed, the two elastic sealing strips contact and seal with the lower end surfaces of the first plate and the second plate, respectively.

[0008] Furthermore, a support is fixedly installed on the side of the frame. The support has an L-shaped cross-section. A portion of the elastic sheet is attached and fixed to the support. The suspended portion of the elastic sheet relative to the support is sealed with the first plate surface of the blade.

[0009] Furthermore, a limiting wedge is fixedly installed on the side of the frame. The limiting wedge has an inclined surface facing the rotation direction of the blade. As the blade rotation angle changes, the squeezing force of the inclined surface on the U-shaped elastic tube gradually increases, and the limiting wedge is used to limit the rotation angle of the blade.

[0010] Furthermore, supports two are fixedly installed on both the upper and lower inner sides of the frame, and the elastic sealing strip is fixedly installed on the supports two. Multiple blade supports are provided between the first and second plates of the blade, and through holes for airflow are provided on the blade supports.

[0011] The shaft and the frame are rotatably mounted via an angular contact ball bearing. A nut is fitted on the shaft above the angular contact ball bearing, and the nut defines the relative position of the shaft and the angular contact ball bearing. Similarly, the lower part of the shaft is also mounted to the frame via an angular contact ball bearing and a nut. The shaft can be a single shaft that runs through the blade, or it can be divided into an upper shaft and a lower shaft arranged coaxially. The bottom end of the upper shaft is fixedly connected to the upper part of the blade, and the upper end of the lower shaft is fixedly connected to the bottom of the blade. These are common settings for connecting the valve stem and valve core in the valve industry, and will not be described in detail here.

[0012] The flue gas damper valve of this utility model can be a single valve with only one blade, or two or more blades can be combined and installed in a frame to form a damper valve unit. For example, when a single valve has two blades, the frame forms two valve ports, and a blade is rotatably installed in each valve port via a shaft. Similarly, the blade has a double-layer structure. When the blade is in the closed state, the double-layer structure of the blade includes a first plate surface and a second plate surface. Both plate surfaces form a seal with the inner peripheral side surface of the frame, and the inner surfaces of the two plate surfaces and the inner peripheral side surface of the frame surround a sealed space. A sealing air inlet is provided on the frame, which is used to introduce compressed air into the sealed space to form an airtight seal.

[0013] Furthermore, the blade has a flow passage hole on its side, and the part of the frame that separates the two valve ports has an overflow hole. The sealing air interface fills the sealing space of the two blades with compressed air through the flow passage hole and the overflow hole.

[0014] The flue gas damper valve of this utility model can be used alone or multiple valves can be used side by side. Each flue gas damper valve is equipped with an actuator, and each actuator drives one blade to rotate, or drives two or more blades to rotate synchronously through a transmission mechanism.

[0015] The advantages of this utility model's technical solution are:

[0016] (1) This utility model uses two mechanical seals and an air seal located between the mechanical seals to form a three-seal system, which can achieve zero leakage of the flue gas damper valve and completely prevent the risk of CO leakage.

[0017] (2) The modular design of the flue gas damper valve allows for the selection of one or more units of the flue gas damper valve to be used in parallel for the enclosed space as needed, making the processing and manufacturing simpler.

[0018] (3) The angular contact ball bearing and two nuts work together to rotate the shaft on the frame, ensuring that the blades rotate freely, do not jam, and will not burst. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the flue gas damper valve of this utility model;

[0020] Figure 2 This is a front view of the flue gas damper valve of this utility model;

[0021] Figure 3 This is a schematic diagram of the double-layer sealing structure of the blade and frame of the flue gas damper valve of this utility model;

[0022] Figure 4 This is a schematic diagram of the longitudinal section of the flue gas damper valve of this utility model;

[0023] Figure 5 This is a schematic diagram of the shaft and frame sealing structure of the flue gas damper valve of this utility model;

[0024] In the diagram: 1. Frame, 2. Blade, 3. Shaft, 4. Sealing air inlet, 5. Actuator, 6. Transmission rod, 7. Elastic sheet, 8. U-shaped elastic tube, 9. Support 1, 10. Limiting wedge, 11. Elastic sealing strip, 12. Support 2, 13. Blade support, 14. Angular contact ball bearing, 15. Nut. Detailed Implementation

[0025] See Figure 1 and Figure 2 The figures shown are a three-dimensional structural diagram and a front view of the flue gas damper valve of this utility model. In this illustrated embodiment, two blades 2 are installed as a unit in the same frame 1. One actuator 5 directly drives one blade 2 to rotate and drives the shaft 3 of the other blade 2 to rotate through a transmission rod 6. That is, one actuator 5 simultaneously drives the opening and closing of two blades 2, and multiple units can be used side by side. However, it is obvious to those skilled in the art that the flue gas damper valve of this utility model can also be a structure in which one blade 2 is installed in one frame 1. The flue gas damper valve provided by this utility model will be further described in detail with reference to the accompanying drawings.

[0026] The flue gas damper valve of this invention shares similarities with existing damper valves, including a frame 1, blades 2, a shaft 3, and an actuator 5. The blades 2 are rotatably supported within the frame 1 via the shaft 3. The actuator 5 drives the shaft 3 to rotate, thereby causing the blades 2 to rotate and open / close. As an improvement, the blades 2 of this invention have a double-layer structure. When closed, both layers of the blades 2 form a seal with the frame 1, creating a sealed space between the frame 1 and the double-layered surfaces of the blades 2. A sealing air inlet 4 is provided on the frame 1, through which compressed air is injected into the sealed space, forming an independent air seal and enhancing the sealing performance between the blades 2 and the frame 1.

[0027] Figure 3 This is a schematic diagram of the double-layer sealing structure of the flue gas damper valve of this utility model, showing the sealing structure between the side of the blade 2 and the frame 1. (See attached diagram) Figure 3 An elastic sheet 7 is fixedly installed on the side of the frame 1. When the blade 2 is closed, the elastic sheet 7 abuts against the first plate surface of the blade 2 to form a seal. A U-shaped elastic tube 8 is installed on the second plate surface of the blade 2. The side wall of the frame 1 presses the U-shaped elastic tube 8 to make it seal tightly against the frame 1, thereby achieving a seal between the second plate surface and the frame 1. See also Figure 3A support 9 is welded or bolted to the side wall of frame 1. The portion of support 9 extending beyond frame 1 has an L-shaped cross-section. A portion of elastic sheet 7 is sealed and fitted onto support 9. In the illustrated embodiment, bolts are also used to lock the position of elastic sheet 7 and support 9. When blade 2 rotates to the closed state, the suspended portion of elastic sheet 7 is pushed by blade and elastically deforms, abutting against blade 2 to achieve a tight seal. U-shaped elastic tube 8 is a long strip of elastic sealing tube. A bracket is installed on the second plate surface of blade 2. One side of U-shaped elastic tube is fixedly connected to the bracket, so it moves with the rotation of blade 2. When blade 2 rotates to the closed state, the other side of U-shaped elastic tube 8 is squeezed and deformed by frame 1, thus sealing tightly against frame 1. To achieve flexible rotation of blade 2, an appropriate space is left between the side of blade 2 and frame 1. The side of U-shaped elastic tube 8 extends outward beyond the size of blade 2, and the extra dimension is greater than the space reserved between blade 2 and the side of frame 1. This not only does not hinder the flexible rotation of blade 2, but also ensures the sealing effect by compressing and deforming U-shaped elastic tube 8.

[0028] Furthermore, to prevent the blade 2 from excessively rotating and excessively squeezing or violently colliding with the elastic sheet 7, a limiting wedge 10 is fixedly installed on the side of the frame 1. The limiting wedge 10 has an inclined surface facing the rotation direction of the blade 2. As the blade 2 gradually closes, the blade 2 moves closer to the inclined surface. As the rotation angle changes, the squeezing force of the inclined surface on the U-shaped elastic tube 8 gradually increases, which helps to enhance the fit and seal. When the blade 2 is fully closed, the edge of the plate on which the U-shaped elastic tube 8 is installed abuts against the side or inclined surface of the limiting wedge 10 to prevent the blade 2 from continuing to rotate.

[0029] Figure 3 The sealing structure between the side edges of blade 2 and the inner surface of frame 1 is shown. See [link / reference] Figure 4 This is a longitudinal cross-sectional view of the flue gas damper valve of this utility model, showing the sealing structure between the upper and lower edges of the blade 2 and the upper and lower inner surfaces of the frame 1. As shown in the figure, elastic sealing strips 11 are fixedly installed on both the upper and lower inner surfaces of the frame 1. The cross-section of the elastic sealing strip 11 is circular or annular, corresponding to the positions of the two plates when the blade 2 is closed. Two elastic sealing strips 11 are provided at each of the upper and lower ends, and the seal is achieved by elastically deforming and adhering to the upper and lower end surfaces of the blade 2. Specifically, a second support 12 is fixed on both the upper and lower inner surfaces of the frame 1. The part of the second support 12 protruding from the inner surface of the frame 1 also has an L-shaped cross-section. The elastic sealing strips 11 are glued or bolted to the second support 12.

[0030] See Figure 4Multiple blade supports 13 are provided between the double-layer plates of the blade 2 to enhance the overall structural strength of the blade 2. At the same time, through holes are opened on the blade supports 13 to facilitate the filling of the entire internal space of the blade 2 with compressed air.

[0031] Figure 5 This is a schematic diagram of the shaft and frame sealing structure of the flue gas damper valve of this utility model. The shaft 3 and the frame 1 are rotatably installed through an angular contact ball bearing 14. Two or more nuts 15 are fitted on the shaft 3 and above the angular contact ball bearing 14. The nuts 15 limit the relative position of the shaft 3 and the angular contact ball bearing 14, so that the shaft 3 can bear the bearing load caused by the weight of the blade 2, ensuring that the blade 2 rotates freely without the bearing bursting.

Claims

1. A flue gas damper valve, comprising a blade (2), a frame (1), and a shaft (3), wherein the shaft (3) is vertically arranged to rotatably mount the blade within the frame (1), characterized in that: The blade (2) has a double-layer structure. When the blade (2) is in the closed state, the double-layer structure of the blade includes a first plate surface and a second plate surface. Both plates surface and the inner peripheral side surface of the frame (1) form a seal, and the inner surfaces of the two plates surface and the inner peripheral side surface of the frame (1) surround a sealed space. A sealing air inlet (4) is provided on the frame (1). The sealing air inlet (4) is used to introduce compressed air into the sealed space to form an air seal.

2. The flue gas damper valve according to claim 1, characterized in that, An elastic sheet (7) is fixedly installed on the side of the frame (1) corresponding to the closed position of the blade (2). When the blade (2) is closed, the elastic sheet (7) elastically deforms and adheres to the first plate surface, forming a seal between the side of the first plate surface and the frame (1). A U-shaped elastic tube (8) is fixedly installed on the side of the second plate surface or the side of the frame (1). When the blade (2) is closed, the U-shaped elastic tube (8) elastically deforms and abuts against the frame (1) or the side of the second plate surface, forming a seal between the side of the second plate surface and the frame (1).

3. The flue gas damper valve according to claim 1 or 2, characterized in that, The upper inner surface of the frame (1) is provided with two elastic sealing strips (11). When the blade (2) is closed, the two elastic sealing strips (11) contact and seal with the upper end surfaces of the first plate and the second plate respectively. The lower inner surface of the frame (1) is also provided with two elastic sealing strips (11). When the blade (2) is closed, the two elastic sealing strips (11) contact and seal with the lower end surfaces of the first plate and the second plate, respectively.

4. The flue gas damper valve according to claim 2, characterized in that, A support (9) is fixedly installed on the side of the frame (1), and a portion of the elastic sheet (7) is attached to and fixed on the support (9). The suspended portion of the elastic sheet (7) relative to the support (9) is sealed with the first plate surface of the blade (2).

5. The flue gas damper valve according to claim 2 or 4, characterized in that, A limiting wedge (10) is fixedly installed on the side of the frame (1). The limiting wedge (10) has an inclined surface facing the rotation direction of the blade (2). As the rotation angle of the blade (2) changes, the squeezing force of the inclined surface on the U-shaped elastic tube (8) gradually increases, and the limiting wedge (10) is used to limit the rotation angle of the blade (2).

6. The flue gas damper valve according to claim 3, characterized in that, Supports (12) are fixedly installed on the upper inner side and the lower inner side of the frame (1), and the elastic sealing strip (11) is fixedly installed on the support (12).

7. The flue gas damper valve according to claim 1, characterized in that, Multiple blade supports (13) are provided between the first and second plates of the blade (2), and through holes are provided on the blade supports (13) for air to flow through.

8. The flue gas damper valve according to claim 1, characterized in that, The shaft (3) is rotatably mounted to the frame (1) via an angular contact ball bearing (14). A nut (15) is fitted on the shaft (3) and above the angular contact ball bearing (14), and the nut (15) defines the relative position of the shaft (3) and the angular contact ball bearing (14).

9. A flue gas damper valve, comprising a blade (2), a frame (1), and a shaft (3), wherein the frame (1) forms two valve ports, and a blade (2) is rotatably mounted in each valve port via the shaft (3), characterized in that: The blade (2) has a double-layer structure. When the blade (2) is in the closed state, the double-layer structure of the blade includes a first plate surface and a second plate surface. Both plates surface and the inner peripheral side surface of the frame (1) form a seal, and the inner surfaces of the two plates surface and the inner peripheral side surface of the frame (1) surround a sealed space. A sealing air inlet (4) is provided on the frame (1). The sealing air inlet (4) is used to introduce compressed air into the sealed space to form an air seal.

10. The flue gas damper valve according to claim 9, characterized in that, The blade (2) has a flow passage hole on its side, and the part of the frame (1) that separates the two valve ports has a flow passage hole. The sealing air interface (4) fills the sealing space of the two blades (2) with compressed air through the flow passage hole and the flow passage hole.

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