A structure to prevent malfunction of flue shut-off gate valve

Abstract

This application relates to a structure for preventing malfunction of a flue shut-off gate valve, belonging to the field of shut-off valve technology and equipment. It includes a valve body, with a gate plate vertically slidably connected inside the valve body. A cylinder is disposed at the top of the gate plate. It also includes a support plate located below the gate plate. A drive assembly for driving the support plate to move horizontally is disposed on one side of the valve body. When the support plate is in a first position, it is positioned below the gate plate, supporting it. When the support plate is in a second position, its projection along the height direction is offset from that of the gate plate. This application prevents the shut-off gate valve from malfunctioning and falling due to a decrease in air pressure in the cylinder, thus avoiding overpressure in the boiler room furnace.

Description

Technical Field

[0001] This application relates to the field of shut-off valve technology and equipment, and in particular to a structure for preventing malfunction of a flue shut-off gate valve. Background Technology

[0002] In the application of baghouse dust collectors in industrial boiler systems, achieving efficient pulse cleaning requires precise zone control of flue gas flow. The currently widely adopted flue shut-off control scheme is based on deploying an integrated pneumatic actuator system consisting of four independent flue shut-off valve units.

[0003] The system's drive and control center is a solenoid valve-based cylinder linkage mechanism. Specifically, each shut-off valve unit is equipped with a dedicated double-acting or single-acting pneumatic actuator cylinder, precisely controlled by a solenoid pilot valve. This cylinder, via a rigid connection such as a piston rod, directly drives the valve plate of its associated large-diameter flue gate valve, performing the opening or closing action of the valve port. The valve body itself typically employs high-temperature resistant, wear-resistant materials and structural designs with excellent sealing performance to adapt to the complex gas conditions in the boiler tail flue, which are characterized by high temperatures, dust, and potentially corrosive gases.

[0004] Regarding the aforementioned technologies, the inventors believe that damage to the air compressor and pulse dust collector pad can lead to a drop in air pressure, causing the cylinder to actuate and the flue shut-off valve to fall completely, resulting in an instantaneous positive pressure overpressure in the boiler furnace. If the operation is not appropriate, it can cause positive pressure overpressure in the boiler room furnace and lead to an explosion safety accident. Utility Model Content

[0005] In order to prevent the shut-off gate valve from malfunctioning and falling due to a decrease in air pressure in the cylinder, which could cause an overpressure in the boiler furnace, this application provides a structure to prevent the shut-off gate valve of the flue from malfunctioning.

[0006] This application provides a structure for preventing malfunction of a flue shut-off gate valve, employing the following technical solution:

[0007] A structure for preventing malfunction of a flue shut-off gate valve includes a valve body, a gate plate vertically slidably connected inside the valve body, a cylinder disposed at the top of the gate plate, and a support plate located below the gate plate. A drive assembly for driving the support plate to move horizontally is disposed on one side of the valve body. When the support plate is in a first position, it is located below the gate plate and supports the gate plate. When the support plate is in a second position, the projections of the support plate and the gate plate in the height direction are offset.

[0008] Optionally, the drive assembly includes a horizontally arranged screw, which is threadedly connected to the side wall of the valve body. The end of the screw is fixedly connected to the support plate, and a drive element for driving the screw to rotate is provided at the end of the screw away from the support plate.

[0009] Optionally, the valve body has a receiving groove on one side relative to the support plate, and the support plate enters the receiving groove under the drive of the screw, so that the receiving groove completely accommodates the support plate.

[0010] Optionally, a first limiter is provided at the first position and is signal-connected to the driving component, and a second limiter is provided at the second position and is signal-connected to the driving component.

[0011] Optionally, a pressure detector is provided on the cylinder, the detection end of the pressure detector is located inside the working end of the cylinder, the pressure detector detects the air pressure of the cylinder, and the pressure detector is signal connected to the drive component.

[0012] Optionally, the pressure detection device is also connected to an alarm. When the pressure detection device detects that the cylinder pressure is lower than a predetermined value, the pressure detection device controls the alarm to sound.

[0013] Optionally, the drive assembly includes a supporting outer tube, which is rotatably connected to the valve body. A supporting inner rod is coaxially threaded inside the supporting outer tube, and the supporting inner rod is fixedly connected to the supporting plate. An anti-rotation component is provided on the supporting plate.

[0014] Optionally, the anti-rotation component includes a telescopic rod, one end of which is fixed to the valve body, and the other end of which is fixed to the support plate. The telescopic direction of the telescopic rod is set along the moving direction of the support plate.

[0015] Optionally, the telescopic rod includes a telescopic outer tube, and a telescopic inner rod is slidably connected inside the telescopic outer tube. The telescopic outer tube is fixedly connected to the valve body, and the telescopic inner rod is fixedly connected to the support plate.

[0016] Optionally, the drive assembly includes a hydraulic cylinder, the piston rod of which is fixedly connected to the support plate. When the piston rod of the hydraulic cylinder is fully retracted, the support plate and the gate plate are offset in the projection along the height direction.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. Add a gas pressure detection device and install an automatic extension mechanism with a motor at the rising position of the flue damper. Controlled by a PLC program, the mechanism automatically extends when the gas pressure is too low to prevent the damper from falling down at the rising position. This achieves the goal of not affecting the original mechanism's operation while ensuring that the flue shut-off valve does not malfunction when the gas pressure is too low, thus guaranteeing the safety of the boiler room furnace pressure.

[0019] 2. Ensure that the flue shut-off valve does not malfunction when the air pressure is low, thus preventing accidents caused by overpressure in the boiler room. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a structure for preventing malfunction of a flue shut-off gate valve in an embodiment of this application.

[0021] Explanation of reference numerals in the attached drawings: 1. Valve body; 11. Gate; 12. Solenoid valve; 13. Pressure detector; 14. Receiving groove; 2. Cylinder; 3. Support plate; 4. First position; 41. First limiter; 5. Second position; 51. Second limiter; 6. Drive assembly; 61. Screw; 62. Rotary motor. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0024] In the application of baghouse dust collectors in industrial boiler systems, achieving efficient pulse cleaning requires precise zone control of flue gas flow. The currently widely adopted flue shut-off control scheme is based on deploying an integrated pneumatic actuator system consisting of four independent flue shut-off valve units.

[0025] The system's drive and control center is a solenoid valve-based cylinder linkage mechanism. Specifically, each shut-off valve unit is equipped with a dedicated double-acting or single-acting pneumatic actuator cylinder, precisely controlled by a solenoid pilot valve. This cylinder, via a rigid connection such as a piston rod, directly drives the valve plate of its associated large-diameter flue gate valve, performing the opening or closing action of the valve port. The valve body itself typically employs high-temperature resistant, wear-resistant materials and structural designs with excellent sealing performance to adapt to the complex gas conditions in the boiler tail flue, which are characterized by high temperatures, dust, and potentially corrosive gases.

[0026] Regarding the aforementioned technologies, the inventors believe that damage to the air compressor and pulse dust collector pad can lead to a drop in air pressure, causing the cylinder to actuate and the flue shut-off valve to fall completely, resulting in an instantaneous positive pressure overpressure in the boiler furnace. If the operation is not appropriate, it can cause positive pressure overpressure in the boiler room furnace and lead to an explosion safety accident.

[0027] In order to prevent the shut-off gate valve from malfunctioning and falling due to a decrease in air pressure in the cylinder, which could cause an overpressure in the boiler furnace, this application provides a structure to prevent the shut-off gate valve of the flue from malfunctioning.

[0028] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0029] This application discloses a structure for preventing malfunction of a flue shut-off gate valve. (Refer to...) Figure 1 A structure for preventing malfunction of a flue shut-off gate valve includes a valve body 1. A gate 11 is located inside the valve body 1, slidably connected to the valve body 1, and moves vertically along the interior of the valve body 1. The height of the gate 11 is less than the height of the valve body 1, thus dividing the interior of the valve body 1 into an operating space at the top of the gate 11 and a shut-off space at the bottom of the gate 11. A cylinder 2 is located at the top of the gate 11, with its actuating end communicating with the operating space at the top of the valve body 1. When the air pressure in the cylinder 2 is greater than a predetermined value, the top of the gate 11 adheres to the bottom of the cylinder 2, keeping the interior of the valve body 1 open. When the air pressure in the cylinder 2 drops below the predetermined value due to damage to the air compressor and pulse dust collector pad, the gate 11 malfunctions and descends, blocking the shut-off space.

[0030] A support plate 3 is located inside the valve body 1, below the gate 11. When the support plate 3 is in the first position 4, it is below the gate 11, thus supporting the gate 11 and preventing it from falling due to malfunction. When the support plate 3 is in the second position 5, its projection along the height direction is offset from the gate 11, so that the support plate 3 does not support the gate 11, allowing the gate 11 to fall and perform the corresponding operation.

[0031] A drive assembly 6 is provided on the side wall of the valve body 1 at a position relative to the support plate 3, which drives the support plate 3 to move relative to each other at a first position 4 and a second position 5. The drive assembly 6 drives the support plate 3 to move between the first position 4 and the second position 5, thereby adjusting the position of the support plate 3.

[0032] A solenoid valve 12 controlling the cylinder 2 is located on one side of the cylinder 2. A pressure detector 13 is also located on one side of the cylinder 2, with its detection end inside the working end of the cylinder 2. The pressure detector 13 can detect the gas pressure inside the air pump, and its output current signal is connected to the analog input terminal PIW256 of the PLC. The pressure detector 13 is also connected to the drive assembly 6. When the pressure detector 13 detects that the pressure inside the cylinder 2 is lower than a predetermined value, it controls the drive assembly 6 to move the support plate 3 to the first position 4, thus supporting the gate 11. When the pressure detector 13 detects that the pressure inside the cylinder 2 is higher than the predetermined value, it controls the drive assembly 6 to move the support plate 3 to the second position 5, preventing the support plate 3 from supporting the gate 11.

[0033] The pressure detector 13 is also connected to an alarm. When the pressure detector 13 detects that the pressure of the cylinder 2 is lower than a predetermined value, the pressure detector 13 controls the alarm to sound.

[0034] In some embodiments, the drive assembly 6 includes a hydraulic cylinder, which is horizontally positioned. The piston end of the hydraulic cylinder passes through the side wall of the valve body 1 and is slidably connected to it. The hydraulic cylinder is fixedly connected to the valve body 1, and the piston end of the hydraulic cylinder is fixedly connected to the support plate 3. The piston end of the hydraulic cylinder drives the support plate 3 to move. The direction of movement of the piston end of the hydraulic cylinder is set along the line connecting the first position 4 and the second position 5. The hydraulic cylinder is connected to the pressure detector 13 for signal transmission.

[0035] In some other embodiments, the drive assembly 6 includes a horizontally arranged screw 61 that passes through the side wall of the valve body 1 and is threadedly connected to the side wall of the valve body 1. One end of the screw 61 is fixedly connected to the support plate 3, and the other end of the screw 61 is provided with a rotary motor 62 that drives the screw 61 to rotate. The rotary motor 62 is signal-connected to the pressure detector 13. The axial direction of the screw 61 is arranged along the line connecting the first position 4 and the second position 5. When the output end of the rotary motor 62 controls the screw 61 to rotate, the screw 61 moves along the axial direction on the side wall of the valve body 1, thereby driving the support plate 3 to move between the first position 4 and the second position 5.

[0036] In some other embodiments, the drive assembly 6 includes a supporting outer tube, which is tubular in shape and its axis is aligned along the line connecting the first position 4 and the second position 5. The outer wall of the supporting outer tube passes through the side wall of the valve body 1 and is rotatably connected to the side wall of the valve body 1. An inner supporting rod is coaxially disposed inside the supporting outer tube and threadedly connected to it, allowing the inner supporting rod to move along the axis of the supporting outer tube within it. One end of the inner supporting rod is fixedly connected to the support plate 3, and a rotating motor 62 is disposed at the end of the supporting outer tube opposite to the support plate 3. The motor shaft of the rotating motor 62 is coaxially and fixedly connected to the supporting outer tube, and the rotating motor 62 drives the supporting outer tube to rotate against the side wall of the valve body 1.

[0037] The support plate 3 is also horizontally provided with an anti-rotation component on the side near the inner support rod. The anti-rotation component can restrict the rotation of the inner support rod, thereby allowing the inner support rod to move horizontally from inside the outer support tube.

[0038] The anti-rotation component includes a horizontally arranged telescopic outer tube, a telescopic inner rod coaxially arranged inside the telescopic outer tube, the telescopic outer tube and the telescopic inner rod being slidably connected, the telescopic outer tube being fixedly connected to the valve body 1, and the telescopic inner rod being fixedly connected to the support plate 3.

[0039] When the rotating motor 62 drives the outer support tube to rotate, the inner support rod inside the outer support tube moves along the axis of the outer support tube, causing the support plate 3 to move between the first position 4 and the second position 5.

[0040] The inner wall of the valve body 1 is provided with a receiving groove 14 at the position relative to the drive assembly 6. The support plate 3 can be located inside the receiving groove 14, so that the support plate 3 can be offset from the projection of the gate 11 in the height direction. At the second position 5, the influence of the support plate 3 on the movement of the gate 11 is reduced.

[0041] A first limiter 41 is provided at the first position 4. The first limiter 41 is used to detect that the support plate 3 is in the first position. A second limiter 51 is also provided inside the receiving groove 14. The second limiter 51 is used to detect that the support plate 3 is in the second position.

[0042] A pressure detector 13 is installed on the air line at the front end of the solenoid valve 12 of the control baffle cylinder 2. The current signal output by the pressure detector 13 is connected to the analog input terminal PIW256 of the PLC. When the pressure value is lower than the preset value, the PLC will issue a first command. The drive component 6 drives the support plate 3 to the first limit switch 41 and then the drive component 6 stops running, supports the gate 11 and displays an alarm to remind the operator to deal with the air pressure failure. When the pressure value recovers to a value higher than the preset value, the PLC will issue a second command. The drive component 6 drives the support plate 3 to retract and stop running when it reaches the second limit switch 51. The flue gas shut-off valve returns to normal.

[0043] In this application, the term "multiple" refers to at least two or more, unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A structure for preventing malfunction of a flue shut-off gate valve, comprising a valve body (1), wherein a gate plate (11) is vertically slidably connected inside the valve body (1), and a cylinder (2) is provided at the top of the gate plate (11), characterized in that: It also includes a support plate (3) located below the gate (11). A drive assembly (6) for driving the support plate (3) to move horizontally is provided on one side of the valve body (1). When the support plate (3) is in the first position (4), the support plate (3) is located below the gate (11) to support the gate (11). When the support plate (3) is in the second position (5), the projection of the support plate (3) and the gate (11) in the height direction is offset.

2. The structure for preventing malfunction of a flue cut-off gate valve according to claim 1, characterized by: The drive assembly (6) includes a horizontally arranged screw (61), which is threaded to the side wall of the valve body (1) and fixedly connected to the support plate (3). A drive member for driving the screw (61) to rotate is provided at one end of the screw (61) away from the support plate (3).

3. The structure for preventing malfunction of the flue shut-off gate valve according to claim 2, characterized in that: The valve body (1) has a receiving groove (14) on one side relative to the support plate (3). The support plate (3) enters the receiving groove (14) under the drive of the screw (61), and the receiving groove (14) completely accommodates the support plate (3).

4. The structure for preventing malfunction of a flue cut-off gate valve according to claim 2, characterized by: A first limiter (41) is provided at the first position (4), and the first limiter (41) is signal connected to the drive component. A second limiter (51) is provided at the second position (5), and the second limiter (51) is signal connected to the drive component.

5. The structure for preventing malfunction of a flue cut-off gate valve according to claim 2, characterized by: A pressure detector (13) is provided on the cylinder (2). The detection end of the pressure detector (13) is located inside the working end of the cylinder (2). The pressure detector (13) detects the air pressure of the cylinder (2). The pressure detector (13) is connected to the drive unit via signal.

6. The structure for preventing the false operation of the flue cut-off gate valve according to claim 5, characterized in that: The pressure detector (13) is also connected to an alarm. When the pressure of the cylinder (2) is lower than a predetermined value, the pressure detector (13) controls the alarm to sound.

7. The structure for preventing malfunction of a flue cut-off gate valve according to claim 1, characterized by: The drive assembly (6) includes a support outer tube, which is rotatably connected to the valve body (1). The support outer tube is coaxially threaded with a support inner rod, which is fixedly connected to the support plate (3). The support plate (3) is provided with an anti-rotation component.

8. The structure for preventing the false operation of the flue cut-off gate valve according to claim 7, characterized in that: The anti-rotation component includes a telescopic rod, one end of which is fixed to the valve body (1), and the other end of which is fixed to the support plate (3). The telescopic direction of the telescopic rod is set along the moving direction of the support plate (3).

9. The structure for preventing the false operation of the flue cut-off gate valve according to claim 8, characterized by: The telescopic rod includes a telescopic outer tube, and a telescopic inner rod is slidably connected inside the telescopic outer tube. The telescopic outer tube is fixedly connected to the valve body (1), and the telescopic inner rod is fixedly connected to the support plate (3).

10. The structure for preventing malfunction of the flue shut-off gate valve according to claim 1, characterized in that: The drive assembly (6) includes a hydraulic cylinder, the piston rod of which is fixedly connected to the support plate (3). When the piston rod of the hydraulic cylinder is fully retracted, the support plate (3) and the gate (11) are offset along the height direction.

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