A leak-proof mechanical flue gas pressure relief valve

Abstract

This utility model provides a leak-proof mechanical flue gas pressure relief valve, which can prevent leakage during normal use, requires no counterweight, and has a simple structure and light weight. One end of the pressure relief cylinder is connected to the flue gas side facility, and the other end is equipped with a movable cover plate. The movable cover plate is movably connected to the pressure relief cylinder and is configured as an openable component to cover and seal the other end of the pressure relief cylinder during pressure relief. A sealing gasket is set between the movable cover plate and the other end of the pressure relief cylinder. One end of the pressure guiding cylinder is connected to the pressure relief cylinder, and the other end is connected to the pilot valve. A retractable clamping device is installed on the pressure guiding cylinder, and one end of it can be detachably contacted with the movable cover plate to clamp the movable cover plate when the flue gas pressure is normal, or to release the clamping force on the movable cover plate under overpressure conditions. The pilot valve is connected to the retractable clamping device through a thin steel cable to receive the pressure transmission from the pressure guiding cylinder and control the operation of the retractable clamping device through the thin steel cable when pressure relief is required.

Description

Technical Field

[0001] This utility model belongs to the field of industrial furnace flue gas treatment engineering, and relates to overpressure protection technology, specifically a leak-proof mechanical flue gas pressure relief valve. Background Technology

[0002] In the process of industrial furnace flue gas treatment, in order to protect facilities such as desulfurization devices, denitrification devices and flue, prevent damage to facilities caused by flue gas overpressure, and avoid safety accidents such as property damage or personal injury, pressure relief valves or explosion-proof doors are usually installed on the relevant facilities.

[0003] Currently, commonly used mechanical pressure relief valves or explosion-proof doors are generally gravity-operated, using a counterweight to press down on the outlet of the pressure relief device. When the flue gas becomes overpressured, the cover flips over to achieve pressure relief or explosion prevention. However, as the flue gas pressure increases, the clamping force of the cover decreases. Before the pressure relief is initiated, the clamping force cannot guarantee the required clamping force for flue gas sealing. This results in flue gas leakage from the pressure relief valve before the predetermined relief pressure is reached, severely affecting the operating environment. Furthermore, prolonged leakage can cause severe corrosion of the pressure relief valve and surrounding facilities by the flue gas, affecting the service life and safety of the equipment.

[0004] In addition, gravity-type pressure relief valves (explosion-proof doors) are very heavy, especially when the set relief pressure is high. For example, a DN500, 10 kPaG gravity relief valve, with the counterweight, weighs nearly 500 kg, making installation and use extremely inconvenient. Utility Model Content

[0005] To overcome the leakage and heavy weight problems of conventional gravity-type pressure relief valves, this utility model provides a leak-proof mechanical flue gas pressure relief valve. It adopts a retractable clamping device to ensure the clamping force required for sealing before pressure release, preventing leakage during normal use. When the pressure exceeds the set value, the pilot valve generates a pulling force to control the retractable clamping device to contract, and the movable cover of the pressure relief valve opens instantly under the action of flue gas pressure, ensuring the safety of the flue gas system and facilities. It requires no counterweight, has a simple structure, and is lightweight.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A leak-proof mechanical flue gas pressure relief valve, comprising:

[0008] The pressure relief cylinder has a flue gas side facility connected to one end and a movable cover plate installed at the other end.

[0009] A movable cover plate, movably connected to the pressure relief cylinder, is configured to be an openable component that covers and seals the other end port of the pressure relief cylinder during pressure relief.

[0010] A sealing gasket is placed between the movable cover plate and the other end of the pressure relief cylinder to seal the connection between the movable cover plate and the pressure relief cylinder when the flue gas pressure is normal.

[0011] The pressure-conducting cylinder has one end connected to the pressure relief cylinder body and the other end connected to the pilot valve.

[0012] A retractable clamping device is installed on the pressure guiding cylinder body via a fixed bracket. One end of the device can be separated from the movable cover plate to clamp the movable cover plate when the flue gas pressure is normal, or to release the clamping force on the movable cover plate in a controlled manner under overpressure conditions.

[0013] The pilot valve is connected to the retractable clamping device via a thin steel cable. It receives the pressure transmitted from the pressure guide cylinder and controls the operation of the retractable clamping device via the thin steel cable when pressure relief is required.

[0014] Furthermore, the pressure relief cylinder includes a pressure relief pipe, a rotating support, a rotating shaft, and a pressure relief sealing lower flange; the pressure relief pipe is a hollow pipe, one end of which is connected to the flue gas side facility, and the other end is connected to the hollow annular structure pressure relief sealing lower flange; the sealing gasket is a hollow annular structure adapted to the pressure relief sealing lower flange and is fixedly connected to the pressure relief sealing lower flange; the rotating support is fixedly installed on the pressure relief pipe, the rotating shaft is fixedly installed on the rotating support, and a movable cover plate is rotatably connected to the rotating shaft; a through hole is opened on the pressure relief pipe body, and a pressure guiding cylinder is connected to the through hole.

[0015] Furthermore, the movable cover plate includes a pressure relief sealing upper flange and a rotating arm; the pressure relief sealing upper flange is a solid plate-shaped structure adapted to the shape of the pressure relief sealing lower flange; the rotating arm is an L-shaped integrated structure, with the pressure relief sealing upper flange fixedly connected to the inner side of its horizontal section, and its vertical section rotatably connected to the rotating shaft.

[0016] Furthermore, the pressure relief cylinder also includes a rotation limiting chain, one end of which is fixedly connected to the inner wall of the pressure relief pipe, and the other end is fixedly connected to the pressure relief sealing flange, which is used to limit the maximum rotation angle of the movable cover plate.

[0017] Furthermore, the retractable clamping device includes an adjustable clamping bolt, a clamping main shaft, a clamping outer cylinder, a clamping spring, a spring limiting ring, and a pin control mechanism. The clamping outer cylinder is a hollow cylindrical structure with insertion holes on its side walls. The clamping main shaft is slidably mounted inside the clamping outer cylinder, with one end being an internally threaded hollow steel tube and the other end being a steel column with radial pin holes. A spring limiting ring is provided on the outer wall of the steel column. The clamping spring is fitted onto the clamping main shaft and located inside the clamping outer cylinder, connecting the spring limiting ring and the inner wall of the clamping outer cylinder. One end of the adjustable clamping bolt is externally threaded and engages with the internally threaded end of the clamping main shaft, while the other end is a bolt head with a handle, used to clamp and contact the rotating arm when the flue gas pressure is normal. The pin control mechanism is correspondingly installed at the insertion hole of the clamping outer cylinder and slidably inserted into the pin hole, and is connected to the pilot valve via a thin steel cable.

[0018] Furthermore, the pin control mechanism includes a pin guide cylinder, a control pin, a pulley bracket, and a pulley; the pin guide cylinder is connected and installed at the insertion hole of the clamping outer cylinder; the control pin is slidably disposed in the pin guide cylinder and inserted into the pin hole, and its outer end is connected to the pilot valve via a thin steel cable and a pulley; the pulley is installed on the pulley bracket, and the pulley bracket is fixedly connected to the pin guide cylinder.

[0019] Furthermore, the pressure guiding cylinder includes a pressure guiding pipe, a pressure guiding lower flange, and multiple reinforcing plates; one end of the pressure guiding pipe is connected to the pressure relief pipe and reinforced at the connection point by multiple reinforcing plates; the other end of the pressure guiding pipe is fixedly connected to the pressure guiding lower flange; the pressure guiding pipe is fixedly connected to the pressure-pressing outer cylinder by several fixed brackets.

[0020] Furthermore, the pilot valve includes a bellows seal, a pressure-guiding upper flange, a pressure-guiding plate, a pressure-guiding spring, a pilot valve outer cylinder, a pressure regulating device, and a pilot valve main shaft; the pilot valve outer cylinder is a hollow cylindrical structure, one end of which is fixedly connected to the pressure-guiding upper flange, and the other end is provided with an internal thread for threaded connection with the pressure regulating device; the pressure regulating device includes a hollow cylindrical body with external threads, one end of which extends outside the pilot valve outer cylinder, and the other end is located inside the pilot valve outer cylinder, positioned outside the pilot valve. One end of the cylinder is connected to a pressure plate; the pilot valve spindle is slidably inserted into the cylindrical body, with one end extending outward from the cylindrical body and connecting to a thin steel cable, and the other end extending inward into the outer cylinder of the pilot valve and connecting to a pressure guide plate; the pressure guide spring is fitted onto the pilot valve spindle and press-fitted between the pressure guide plate and the pressure plate; the corrugated seal is located inside the outer cylinder of the pilot valve and its end face abuts against the pressure guide plate; the upper pressure guide flange and the lower pressure guide flange are fixedly connected, and the edge of the corrugated seal is press-fitted between the two.

[0021] Furthermore, a handle is connected to one end of the cylindrical body located outside the outer cylinder of the pilot valve, which is used to adjust the pressure of the pressure guide plate and the pressure plate on the pressure guide spring by turning the handle.

[0022] Furthermore, the corrugated seal is made of a flexible material, and its elongation under the set pressure is greater than the length of the control pin extending into the outer cylinder.

[0023] The beneficial effects of this utility model include:

[0024] This pressure relief valve, through a retractable clamping device, utilizes an adjustable clamping bolt and a clamping spring to continuously apply a stable clamping force to the movable cover plate when the flue gas pressure is normal. Combined with the sealing gasket between the movable cover plate and the pressure relief cylinder, reliable sealing is ensured before pressure release, avoiding the premature leakage problem caused by insufficient clamping force in traditional gravity-type pressure relief valves. This reduces the impact of flue gas leakage on the operating environment and corrosion of the pressure relief valve and surrounding facilities, extending the service life of the equipment and ensuring operational safety. Regarding overpressure relief performance, the pressure in the pressure relief cylinder is transmitted to the pilot valve via a pressure guide cylinder. When the flue gas pressure exceeds the set value, the bellows seal of the pilot valve pushes the pressure guide plate under pressure, compressing the pressure guide spring and driving the pilot valve main shaft to pull the thin steel cable. This causes the control pin of the pin control mechanism to be pulled out of the pin hole of the clamping main shaft. The clamping main shaft retracts under the action of the clamping spring, releasing the clamping force on the movable cover plate. The movable cover plate then quickly opens under the action of flue gas pressure, achieving pressure relief and ensuring the safety of the flue gas system and related facilities. Meanwhile, this pressure relief valve eliminates the need for the counterweight structure of traditional gravity-type pressure relief valves, achieving clamping and control through mechanical transmission and spring force, significantly reducing the overall weight and making installation and use more convenient. The pilot valve's pressure regulating device allows for easy adjustment of the set pressure via a handle, adapting to different operating conditions. The rotary limit chain effectively limits the maximum rotation angle of the movable cover, preventing damage caused by excessive opening. The overall structure is simple and rationally designed, combining multiple advantages such as leak prevention, lightweight, convenient operation, and safety and reliability, making it suitable for overpressure protection scenarios in industrial furnace flue gas treatment projects. Attached Figure Description

[0025] Figure 1 This is a front view of the overall structure of this utility model in its closed state;

[0026] Figure 2 This is a top view of the overall structure of this utility model in its closed state;

[0027] Figure 3 This is a front view of the overall structure of this utility model in the open state;

[0028] Figure 4 This is a schematic diagram of the retractable clamping device in its closed state;

[0029] Figure 5 This is a schematic diagram of the retractable clamping device in the open state;

[0030] Figure 6 This is a schematic diagram of the pilot valve in its normal operating state.

[0031] Figure 7 This is a schematic diagram of the pilot valve under overpressure conditions.

[0032] In the diagram: 1-Pressure relief cylinder, 2-Modible cover plate, 3-Sealing gasket, 4-Pressure guide cylinder, 5-Retractable clamping device, 6-Fixed bracket, 7-Pilot valve, 8-Thin steel cable, 101-Pressure relief pipe, 102-Rotating bracket, 103-Rotating shaft, 104-Pressure relief sealing lower flange, 105-Rotating limit chain, 201-Pressure relief sealing upper flange, 202-Rotating arm, 203-Reinforcing rib, 401-Pressure guide pipe, 402-Pressure guide lower flange, 40 3-Reinforcing plate, 501-Adjustable clamping bolt, 502-Clamping spindle, 503-Clamping outer cylinder, 504-Clamping spring, 505-Spring limit ring, 506-Pin guide cylinder, 507-Control pin, 508-Pulley bracket, 509-Pulley, 701-Belled seal, 702-Pressure guiding upper flange, 703-Pressure guiding plate, 704-Pressure guiding spring, 705-Pilot valve outer cylinder, 706-Pressure regulating device, 707-Pilot valve spindle. Detailed Implementation

[0033] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0036] Example 1: The pressure relief pipe 101 is a circular, leak-proof mechanical flue gas pressure relief valve, including: pressure relief cylinder 1, movable cover plate 2, sealing gasket 3, pressure guiding cylinder 4, retractable clamping device 5, fixed bracket 6, pilot valve 7, and thin steel cable 8.

[0037] refer to Figures 1-3The pressure relief cylinder 1, the movable cover plate 2, and the sealing gasket 3 form the main pressure relief channel and its main sealing structure; the retractable clamping device 5 and the fixed bracket 6 provide sealing clamping force; the pressure guide cylinder 4, the retractable clamping device 5, the pilot valve 7, and the thin steel cable 8 provide pressure transmission and control and overpressure action.

[0038] The pressure relief cylinder 1 consists of a pressure relief pipe 101, a rotating support 102, a rotating shaft 103, a rotating limiting chain 105, and a pressure relief sealing lower flange 104. The movable cover plate 2 consists of a pressure relief sealing upper flange 201, two L-shaped rotating arms 202, and several reinforcing ribs 203. The pressure relief pipe 101 is a circular hollow steel pipe, the pressure relief sealing upper flange 201 is a solid circular steel plate, and the matching pressure relief sealing lower flange 104 is an annular steel ring. The sealing gasket 3 is a high-temperature resistant annular flexible material, with the same outer dimensions as the pressure relief sealing lower flange 104, the same inner dimensions as the inner diameter of the pressure relief pipe 101, and a thickness of 5mm.

[0039] One end of the pressure relief pipe 101 is connected to the flue gas side facility by welding or flange connection; the other end is connected to the pressure relief sealing lower flange 104, and the sealing gasket 3 is fixedly connected to the pressure relief sealing lower flange 104. A rotating bracket 102 is welded to the middle of the pressure relief pipe 101, and a rotating shaft 103 is welded to the rotating bracket 102, which is connected to the movable cover plate 2 through the rotating shaft 103. A through hole is opened in the middle of the pressure relief pipe 101, and the through hole is connected to the pressure guiding cylinder 4 by welding.

[0040] The pressure relief sealing upper flange 201 is matched with the pressure relief sealing lower flange 104, and a sealing structure is formed between the upper flange 201 and the sealing gasket 3. The horizontal section of the rotating arm 202 is welded to the pressure relief sealing upper flange 201, and the vertical section is connected to the rotating support 102 via the rotating shaft 103, forming a movable connection that allows rotation around the rotating shaft 103. The reinforcing rib 203 is welded to the two rotating arms 202 at both ends and to the pressure relief sealing upper flange 201 at the bottom. The distance between the two rotating arms 202 is not greater than 2 / 3 of the flange diameter and not less than 1 / 3 of the flange diameter.

[0041] One end of the rotary limiting chain 105 is welded to the inner wall of the pressure relief pipe 101, and the other end is welded to the pressure relief sealing flange 201. It is used to limit the maximum rotation angle of the movable cover plate 2. The length of the rotary limiting chain 105 ensures that the rotation angle of the movable cover plate 2 is not greater than 120° and not less than 90°.

[0042] The pressure-guiding cylinder 4 includes a pressure-guiding pipe 401, a pressure-guiding lower flange 402, and four reinforcing plates 403. One end of the pressure-guiding pipe 401 is welded and connected to the through hole in the middle of the pressure relief pipe 101, and the connection is reinforced by welding the reinforcing plates 403. The other end of the pressure-guiding pipe 401 is welded to the pressure-guiding lower flange 402. The nominal diameter of the pressure-guiding pipe 401 is DN50 to DN00, and in this example, the nominal diameter of the pressure-guiding pipe 401 is DN80.

[0043] refer to Figures 4-5 The retractable clamping device 5 consists of an adjustable clamping bolt 501, a clamping main shaft 502, a clamping outer cylinder 503, a clamping spring 504, a spring limiting ring 505, a pin guide cylinder 506, a control pin 507, a pulley bracket 508, and a pulley 509. The clamping outer cylinder 502 is welded and fixed to the side of the pressure guide pipe 401 by several fixed brackets 6.

[0044] The outer clamping cylinder 503 is a hollow cylindrical structure with an insertion hole on its upper side wall. A connecting pin guide cylinder 506 is welded to the insertion hole. The clamping main shaft 502 is slidably mounted inside the outer clamping cylinder 503. One end of the shaft is a hollow steel tube with internal threads, and the other end is a steel column with a radial pin hole on the upper part of the steel column. The diameter of the pin hole is slightly larger than the outer diameter of the control pin 507. A spring limiting ring 505 is welded to the lower outer wall of the steel column. The clamping spring 504 is fitted onto the clamping main shaft 502 and located inside the outer clamping cylinder 503, and it is connected to the spring limiting ring 505 and... The inner wall of the outer cylinder 503 is pressed together; one end of the adjustable clamping bolt 501 is externally threaded and connects with the internally threaded end of the clamping spindle 502, and the other end is a bolt head with a handle welded on it, which is used to press down and contact the reinforcing rib 203 on the rotating arm 202 when the flue gas pressure is normal; the control pin 507 is slidably disposed in the pin guide cylinder 506 and inserted into the pin hole, and its outer end is connected to the pilot valve 7 through the thin steel cable 8 and the pulley 509; the pulley 509 is installed on the pulley bracket 508, and the pulley bracket 508 is fixedly connected to the pin guide cylinder 506.

[0045] refer to Figures 6-7 The pilot valve 7 consists of a bellows seal 701, a pressure guiding upper flange 702, a pressure guiding plate 703, a pressure guiding spring 704, a pilot valve outer cylinder 705, a pressure regulating device 706, and a pilot valve main shaft 707.

[0046] The pilot valve outer cylinder 705 is a hollow metal cylindrical structure. Its lower end is fixedly connected to the pressure guide flange 702, and its upper end is provided with an internal thread that is threadedly connected to the pressure regulating device 706. The pressure regulating device 706 includes a hollow cylindrical body with external threads. The upper end of the cylindrical body extends out of the pilot valve outer cylinder 705, and the lower end is located inside the pilot valve outer cylinder 705. The lower end inside the pilot valve outer cylinder 705 is connected to a pressure plate, and the upper end outside the pilot valve outer cylinder 705 is connected to a handle. The handle is used to turn the cylindrical body to adjust the pressure between the pressure guide plate 703 and the pressure guide spring 704, thereby adjusting the set pressure value of the flue gas pressure relief.

[0047] The pilot valve spindle 707 is slidably inserted inside the cylindrical body. Its top end extends outward from the cylindrical body and connects to the thin steel cable 8, while its bottom end extends inward into the pilot valve outer cylinder 705 and connects to the pressure guide plate 703. The pressure guide spring 704 is fitted onto the pilot valve spindle 707 and press-fitted between the pressure guide plate 703 and the pressure plate. The bellows seal 701 is located inside the pilot valve outer cylinder 705, with its upper end face abutting against the bottom of the pressure guide plate 703. The upper pressure guide flange 702 and the lower pressure guide flange 402 are fixedly connected, and the edge of the bellows seal 701 is press-fitted between them. The bellows seal 701 is made of a high-temperature resistant flexible material, and its elongation under the set pressure is greater than the length of the control pin 507 extending into the pressing outer cylinder 503.

[0048] Based on the above structural setup, the overall working process of this application is as follows:

[0049] When the flue gas pressure is normal, such as Figure 1 As shown, when the pressure relief cylinder 1 and the movable cover plate 2 are closed, the lower pressure relief sealing flange 104 and the upper pressure relief sealing flange 201 are tightly fitted together by the sealing gasket 3, forming the main sealing structure. The compressible clamping device 5 is as follows... Figure 4 When the device is in the closed state, the control pin 507 is inserted into the pin hole of the clamping spindle 502, the clamping spring 504 is compressed, and the bolt head of the adjustable clamping bolt 501 is pressed downwards against the middle position of the outermost piece of the reinforcing rib 203 of the movable cover plate 2. By rotating the threaded adjustment of the adjustable clamping bolt 501, the movable cover plate 2 is in the clamped state, ensuring that the sealing gasket 3 is fully fitted and that there is no leakage under normal conditions. Figure 6 As shown, the pilot valve 7 is in normal condition at this time. The pressure spring 704 applies a preload to the pressure plate 703, keeping the bellows seal 701 in its initial state. The thin steel cable 8 is in a relaxed state, and the entire system maintains a seal.

[0050] When the flue gas pressure exceeds the set value, the overpressure signal is transmitted to the pilot valve 7 through the through hole on the pressure relief cylinder 1 and the pressure guide cylinder 4. For example... Figure 7 The pilot valve 7 shown is in an overpressure state. Under the pressure of the flue gas, the bellows seal 701 (made of flexible material) inside the pilot valve 7 expands and elongates upwards, pushing the pressure guide plate 703 against it to overcome the preload of the pressure guide spring 704 and move upwards, further compressing the pressure guide spring 704. The movement of the pressure guide plate 703 drives the connected pilot valve main shaft 707 to move upwards, which in turn pulls the control pin 507 in the retractable clamping device 5 through the thin steel cable 8 (which changes direction via pulley 509), causing the control pin 507 to be pulled out of the pin hole of the clamping main shaft 502, releasing the lock on the clamping main shaft 502, and putting the retractable clamping device 5 in the open state. Figure 5As shown. After the control pin 507 is pulled out, the compression spring 504 in the retractable compression device 5, which is in a compressed state, releases its elastic potential energy, pushing the spring limit ring 505 to drive the compression main shaft 502 upward (the compression main shaft 502 retracts into the compression outer cylinder 503). The adjustable compression bolt 501 retracts synchronously with the compression main shaft 502, thus releasing the compression force acting on the movable cover plate 2. At this time, under the direct action of the flue gas pressure, the movable cover plate 2 flips upward around the rotation axis 103 and opens, allowing the flue gas to be quickly released through the pressure relief pipe 101 port, achieving overpressure protection. During this process, the rotation limit chain 105 limits the maximum flipping angle of the movable cover plate 2 (90°-120°) to prevent excessive rotation that could cause structural damage. The open state during overpressure is as follows. Figure 3 As shown.

[0051] When the flue gas pressure drops below the set value, the manual reset device is activated: the movable cover plate 2 is rotated back to its initial position around the rotating shaft 103, so that it re-fits with the pressure relief sealing lower flange 104; by adjusting the adjustable clamping bolt 501 of the retractable clamping device 5, the clamping main shaft 502 is pushed out and the clamping spring 504 is compressed until the pin hole of the clamping main shaft 502 is aligned with the control pin 507, and the control pin 507 is reinserted into the pin hole to lock; at the same time, under the rebound force of the guide pressure spring 704, the pilot valve 7, the guide pressure plate 703 drives the bellows seal 701 to reset, the pilot valve main shaft 707 falls back with the guide pressure plate 703, the thin steel cable 8 is relaxed again, and the entire device returns to the sealed standby state, waiting for the next overpressure signal.

[0052] By turning the handle of the pressure regulating device 706, the pressure between the pressure guide plate 703 and the pressure plate on the pressure guide spring 704 can be adjusted, thereby adjusting the set pressure value of the flue gas pressure relief.

[0053] This pressure relief valve provides sealing pressure through the clamping force generated by the adjustable clamping bolt 501 of the retractable clamping device, which is largely unaffected by changes in flue gas pressure, ensuring that no leakage occurs before pressure relief. No counterweight is required, significantly reducing the overall weight of the pressure relief valve.

[0054] Example 2: The pressure relief pipe 101 is a rectangular, leak-proof mechanical flue gas pressure relief valve. The pressure relief pipe 101 is a rectangular hollow steel pipe, the lower pressure relief sealing flange 104 is a rectangular steel ring, the sealing gasket 3 is a rectangular ring structure, and the upper pressure relief sealing flange 201 is a solid rectangular steel plate. When the upper and lower pressure relief sealing flanges are rectangular, the distance between the two rotating arms 202 is not greater than 2 / 3 of the flange side length perpendicular to the rotating arm 202, and not less than 1 / 3 of the flange side length perpendicular to the rotating arm 202. The remaining settings are the same as in Example 1.

[0055] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A leak-tight mechanical flue gas pressure relief valve, characterized in that include: The pressure relief cylinder (1) has a flue gas side facility connected to one end and a movable cover plate (2) installed at the other end. The movable cover (2) is movably connected to the pressure relief cylinder (1) and is configured to cover and seal the other end port of the pressure relief cylinder (1) when pressure is relieved. A sealing gasket (3) is provided between the movable cover plate (2) and the other end port of the pressure relief cylinder (1) for sealing between the movable cover plate (2) and the pressure relief cylinder (1) when the flue gas pressure is normal. The pressure guiding cylinder (4) has one end port connected to the pressure relief cylinder (1) and the other end port connected to the pilot valve (7); A retractable clamping device (5) is installed on the cylinder body of the pressure guide cylinder (4) via a fixed bracket (6). One end of the device is separable from the movable cover plate (2) to clamp the movable cover plate (2) when the flue gas pressure is normal, or to release the clamping force on the movable cover plate (2) in a controlled manner under overpressure conditions. The pilot valve (7) is connected to the retractable clamping device (5) via a thin steel cable (8) to receive the pressure transmission from the pressure guide cylinder (4) and control the operation of the retractable clamping device (5) via the thin steel cable (8) when pressure needs to be released.

2. A mechanical flue gas pressure relief valve according to claim 1, wherein The pressure relief cylinder (1) includes a pressure relief pipe (101), a rotating bracket (102), a rotating shaft (103), and a pressure relief sealing lower flange (104). The pressure relief pipe (101) is a hollow pipe, one end of which is connected to the flue gas side facility, and the other end is connected to the pressure relief sealing lower flange (104) with a hollow annular structure. The sealing gasket (3) is a hollow annular structure that is adapted to the pressure relief sealing lower flange (104) and is fixedly connected to the pressure relief sealing lower flange (104). The rotating bracket (102) is fixedly installed on the pressure relief pipe (101), and the rotating shaft (103) is fixedly installed on the rotating bracket (102). A movable cover plate (2) is rotatably connected to the rotating shaft (103). A through hole is opened on the body of the pressure relief pipe (101), and a pressure guiding cylinder (4) is connected to the through hole.

3. A mechanical flue gas pressure relief valve according to claim 2, wherein The movable cover plate (2) includes a pressure relief sealing upper flange (201) and a rotating arm (202); the pressure relief sealing upper flange (201) is a solid plate structure that matches the shape of the pressure relief sealing lower flange (104); the rotating arm (202) is an L-shaped integrated structure, with the pressure relief sealing upper flange (201) fixedly connected to the inner side of its horizontal section, and its vertical section rotatably connected to the rotating shaft (103).

4. A mechanical flue gas pressure relief valve according to claim 3, wherein The pressure relief cylinder (1) also includes a rotation limiting chain (105), one end of which is fixedly connected to the inner wall of the pressure relief pipe (101), and the other end is fixedly connected to the pressure relief sealing flange (201) to limit the maximum rotation angle of the movable cover plate (2).

5. A mechanical flue gas pressure relief valve according to claim 3, wherein The retractable clamping device (5) includes an adjustable clamping bolt (501), a clamping spindle (502), a clamping outer cylinder (503), a clamping spring (504), a spring limiting ring (505), and a pin control mechanism; the clamping outer cylinder (503) is a hollow cylindrical structure with insertion holes on its side wall; the clamping spindle (502) is slidably mounted inside the clamping outer cylinder (503), one end of which is an internally threaded hollow steel pipe, and the other end is a steel column with radial pin holes on the steel column, and a spring limiting ring (505) is provided on the outer wall of the steel column; the clamping spring (504) is fitted onto the clamping bolt. The main shaft (502) is mounted on the inside of the clamping outer cylinder (503) and is connected between the spring limiting ring (505) and the inner wall of the clamping outer cylinder (503); one end of the adjustable clamping bolt (501) is externally threaded and is connected to the internally threaded end of the clamping main shaft (502), and the other end is a bolt head with a handle, which is used to press against the rotating arm (202) when the flue gas pressure is normal; the pin control mechanism is installed at the insertion hole of the clamping outer cylinder (503) and is slidably inserted into the pin hole through the insertion hole, and is connected to the pilot valve (7) through the thin steel cable (8).

6. A mechanical flue gas pressure relief valve according to claim 5, wherein The pin control mechanism includes a pin guide cylinder (506), a control pin (507), a pulley bracket (508), and a pulley (509); the pin guide cylinder (506) is connected to the insertion hole of the clamping outer cylinder (503); the control pin (507) is slidably disposed in the pin guide cylinder (506) and inserted into the pin hole, and its outer end is connected to the pilot valve (7) via a thin steel cable (8) and the pulley (509); the pulley (509) is installed on the pulley bracket (508), and the pulley bracket (508) is fixedly connected to the pin guide cylinder (506).

7. A mechanical flue gas pressure relief valve according to claim 5 or 6, c h a r a c t e r i s e d in that The pressure guiding cylinder (4) includes a pressure guiding pipe (401), a pressure guiding lower flange (402), and multiple reinforcing plates (403); one end of the pressure guiding pipe (401) is connected to the pressure relief pipe (101), and the connection point is reinforced by multiple reinforcing plates (403); the other end of the pressure guiding pipe (401) is fixedly connected to the pressure guiding lower flange (402); the pressure guiding pipe (401) is fixedly connected to the pressure-pressing outer cylinder (503) by several fixed brackets (6).

8. A mechanical flue gas pressure relief valve according to claim 7, wherein The pilot valve (7) includes a bellows seal (701), a pressure-guiding upper flange (702), a pressure-guiding plate (703), a pressure-guiding spring (704), a pilot valve outer cylinder (705), a pressure regulating device (706), and a pilot valve main shaft (707); the pilot valve outer cylinder (705) is a hollow cylindrical structure, one end of which is fixedly connected to the pressure-guiding upper flange (702), and the other end is provided with an internal thread that is threadedly connected to the pressure regulating device (706); the pressure regulating device (706) includes a hollow cylindrical body with external threads, one end of which extends out of the pilot valve outer cylinder (705), and the other end is located inside the pilot valve outer cylinder (705), which is located in the pilot valve outer cylinder (707). One end of the pilot valve (705) is connected to a pressure plate; the pilot valve main shaft (707) is slidably inserted into the cylindrical body, one end of which extends outward from the cylindrical body and connects to the thin steel cable (8), and the other end extends inward to the inside of the pilot valve outer cylinder (705) and connects to the pressure guide plate (703); the pressure guide spring (704) is fitted on the pilot valve main shaft (707) and pressed between the pressure guide plate (703) and the pressure plate; the corrugated seal (701) is located inside the pilot valve outer cylinder (705) and its end face abuts against the pressure guide plate (703); the upper pressure guide flange (702) and the lower pressure guide flange (402) are fixedly connected and the edge of the corrugated seal (701) is pressed between the two.

9. A leak-tight mechanical flue gas pressure relief valve according to claim 8, characterized in that The cylindrical body is connected to a handle at one end outside the pilot valve outer cylinder (705), which is used to adjust the pressure of the pressure guide plate (703) and the pressure plate on the pressure guide spring (704) by turning the cylindrical body through the handle.

10. A leak-proof mechanical flue gas pressure relief valve according to claim 8, characterized in that The corrugated seal (701) is made of flexible material, and its elongation under the set pressure is greater than the length of the control pin (507) extending into the pressing outer cylinder (503).

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