Turning plate type flue gas conversion valve

Abstract

The invention relates to a turning plate type flue gas conversion valve which comprises a connecting pipe and a turning plate valve composed of a valve seat, a valve plate and a push rod, and further comprises an automatic drainage mechanism and an anti-locking mechanism. The automatic drainage mechanism is of a water seal type drainage structure or a valve type drainage structure and is arranged on one side of the bottom of the valve plate containing space. The anti-jamming mechanism is of a limiting type anti-jamming structure or a thrust type anti-jamming structure and is arranged on the smoke guide pipe, the valve plate, the push rod or the dust removal main pipe. According to the invention, the problems existing when a flue gas conversion valve is mounted in an upper opening manner in a coke oven coke discharging and dust removing system with a floor-mounted flue gas conversion device are solved; water can be automatically drained, the phenomenon of air leakage or suck-back can be avoided, the phenomenon of jamming caused by excessive opening of the valve plate can be prevented, and the phenomenon of dust accumulation caused by dead corners in the smoke conversion valve can be avoided.

Description

Technical Field

[0001] The present invention relates to a flue gas conversion valve, in particular to a flap type flue gas conversion valve. Background Art

[0002] Coke oven dust removal is a key step in controlling dust emissions during the coking process. It aims to reduce the intermittent dust pollution generated when high-temperature coke is pushed out of the carbonization chamber. The existing coke dust removal system operates as follows: During coke oven discharge, dust is captured by a dust hood installed on the coke interceptor car. This dust is then directed into a dust collection main pipe via a flue gas conversion device. From there, the dust is transported to a ground-based dust removal station for purification.

[0003] Coke oven quenching has evolved from the original wet quenching method to a "primary dry quenching, with wet quenching as a backup" approach. Whether wet quenching is used or as a backup, a coke drying platform is required on the coke side of the coke oven. To ensure that the drying platform does not interfere with the coke cooling process, the dust collection main pipe in the coke discharge dust removal system is typically installed on a steel structure or reinforced concrete support at a height of 12 to 18 meters. Although coke oven systems that use a full dry quenching process have emerged, the layout of the dust collection main pipe in the coke discharge dust removal system has not changed accordingly.

[0004] Since the dust removal interface on the coke interceptor car is usually at a high height, and the flue gas conversion device and dust collection main pipe are set at the same height, they need to be implemented through steel structures or reinforced concrete supports. The disadvantages of this setting method are: 1. High cost, the material and construction costs of the steel structure or reinforced concrete support account for more than 30% of the total investment in the coke dust removal equipment; 2. Difficult maintenance, scaffolding is required for high-altitude equipment maintenance, and the operation is high-risk and time-consuming; 3. There are hidden dangers to work stability: due to long-term thermal expansion, vibration and other factors, the steel structure or reinforced concrete support is prone to deformation, resulting in misalignment of the dust removal interface and air leakage.

[0005] Placing the flue gas conversion device on the ground can solve the above-mentioned problem. In the "A coke oven coke discharge dust removal system and process" (patented on the same day as the present invention), the flue gas conversion device is installed on the ground. The coke oven coke discharge dust removal system includes a coke intercepting car dust collection hood, a smoke guide pipe, a movable connecting mechanism, and a flue gas conversion device. The coke intercepting car dust collection hood is installed on the coke intercepting car, one end of the smoke guide pipe is connected to the coke intercepting car dust collection hood, and the other end of the smoke guide pipe is connected to the flue gas conversion device via a movable connecting mechanism. The movable connecting mechanism and the flue gas conversion device are movably sealed. The flue gas conversion device can adopt a valve-sealed dust removal main pipe, which is composed of a dust removal main pipe and a flue gas conversion valve. The dust removal main pipe is provided with openings corresponding to each carbonization chamber, and a sealed conversion valve is provided at the opening; the movable connection mechanism is composed of a sleeve, a movable guide sleeve, a telescopic drive device and a valve opener and closeer; the sleeve is connected to the smoke guide pipe, and the telescopic drive device and the valve opener and closeer are provided on the sleeve; one end of the movable guide sleeve is connected to the sleeve, and the other end can be telescopically moved under the drive of the telescopic drive device to achieve docking with the corresponding interface (connecting pipe) on the flue gas conversion valve; the valve opener and closeer is used to control the opening and closing action of the flue gas conversion valve. The flue gas conversion valve is provided at the opening of the dust removal main pipe, and the opening can be an upper opening, a side opening or an oblique opening. Among them, the side opening method has the problems of large floor space and high pipeline consumption compared with the oblique opening or upper opening method. When using an oblique opening or an upper opening, the flue gas conversion device has the following problems: 1) It is impossible to drain the accumulated water inside. When the flue gas conversion valve is opened, the accumulated water inside the smoke guide pipe enters the flue gas conversion device and the dust removal ground station along with the flue gas, causing problems such as the dust collector bags sticking and poor ash transportation. 2) When the valve plate of the flue gas conversion valve is opened, the valve plate may become stuck due to the center of gravity of the valve plate deviating from the center of the rotation axis, and the valve plate may not be able to fall down and close by its own weight. 3) When the valve plate of the flue gas conversion valve is opened, there is a dead angle between the valve plate and the connecting pipe. When the flue gas enters this area, ash is easily accumulated and pollutes the environment. Summary of the Invention

[0006] The present invention provides a flap-type flue gas conversion valve, which solves the problems existing when the flue gas conversion valve is installed in an upper opening manner in a coke oven coke outlet dust removal system in which the flue gas conversion device is installed on the ground; it can automatically drain water and avoid air leakage or backdraft, can prevent the valve plate from being stuck due to excessive opening, and can also avoid dust accumulation due to dead corners in the flue gas conversion valve.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A flap-type flue gas conversion valve, which includes a connecting pipe and a flap valve consisting of a valve seat, a valve plate and a push rod. The bottom of the connecting pipe is connected to the top of the valve seat. The valve seat is a tubular valve seat that is adapted to the top opening of the dust removal main pipe. The valve plate is arranged on the top of the valve seat, and one end of the valve plate is connected to the push rod; the connecting pipe is provided with a valve plate accommodating space on one side of the valve plate opening direction, and the bottom of the valve plate accommodating space is closed by the bottom plate; the flap-type flue gas conversion valve also includes an automatic drainage mechanism and an anti-stuck mechanism; the automatic drainage mechanism is a water-sealed drainage structure or a valve-type drainage structure, which is arranged on the bottom side of the valve plate accommodating space; the anti-stuck mechanism is a limiting anti-stuck structure or a thrust anti-stuck structure, which is arranged on the connecting pipe, valve plate, push rod or dust removal main pipe.

[0009] The top surface of the valve seat is an inclined surface, and the end close to the valve plate accommodating space is the lower end; the valve plate is connected to the push rod through a rotating shaft, and the rotating shaft is supported by a bearing seat; the space between the vertical surface where the center line of the rotating shaft is located and the corresponding connecting pipe side wall is the valve plate accommodating space.

[0010] The water-sealed drainage structure is composed of a connecting pipe, a U-shaped pipe and a water outlet pipe connected in sequence. One end of the U-shaped pipe is connected to the bottom of the valve plate accommodating space through the connecting pipe, and the other end of the U-shaped pipe is connected to the water outlet pipe.

[0011] The connecting pipe and the water outlet pipe are both arranged horizontally, and the water outlet pipe is lower than the connecting pipe, and the height difference between the bottom surfaces of the two is not less than 100 mm.

[0012] The water-sealed drainage structure further includes a water supply pipe, which is arranged at the top of the U-shaped pipe.

[0013] The valve type drainage structure consists of a drainage pipe, a check valve and an automatic drainage valve. One end of the drainage pipe is connected to the bottom of the valve plate accommodating space. The check valve and the automatic drainage valve are arranged in sequence from the inside to the outside in the drainage pipe.

[0014] The limit-type anti-stuck structure consists of a telescopic barrier rod and an elastic body; the telescopic barrier rod is arranged on the valve plate away from one end of the push rod, or on the inner wall of the connecting pipe; the length of the telescopic barrier rod is adjustable, and the outer end of the telescopic barrier rod is provided with an elastic body.

[0015] The limit-type anti-stuck structure consists of a telescopic barrier rod and an elastic body; the telescopic barrier rod is arranged on a push rod close to one end of the valve plate, or on the outer wall of the dust removal main pipe; the length of the telescopic barrier rod is adjustable, and the outer end of the telescopic barrier rod is provided with an elastic body.

[0016] The thrust type anti-stuck structure consists of a cylinder, a spring, a limit block and an elastomer. The spring and the limit block are arranged in the cylinder, one end of the limit block extends from the cylinder and an elastomer is arranged at the extended end; the cylinder is arranged on the valve plate away from one end of the push rod, or on the inner wall of the valve seat.

[0017] The thrust type anti-stuck structure consists of a cylinder, a spring, a limit block and an elastomer. The spring and the limit block are arranged in the cylinder, one end of the limit block extends from the cylinder and an elastomer is arranged at the extended end; the cylinder is arranged on a push rod close to one end of the valve plate, or on the outer wall of the dust removal main pipe.

[0018] A flap-type flue gas conversion valve also includes a guide plate, which is installed on the valve plate or the inner wall of the connecting pipe. When the valve plate is opened to the right position, the guide plate blocks the top of the valve plate accommodating space.

[0019] The guide plate is a steel plate.

[0020] The guide plate is composed of a steel plate and a flexible plate. One end of the steel plate is connected to the valve plate, and the other end of the steel plate is connected to the flexible plate.

[0021] When the valve plate is fully opened, the angle between the guide plate and the horizontal plane is greater than 50°.

[0022] When the guide plate is installed on the inner wall of the connecting pipe, the bottom surface of the guide plate is higher than the top surface height of the valve plate when it is fully opened, and the height difference between the two is 5 to 10 mm.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) In order to solve the problem of water accumulation inside the flue gas conversion valve when the flue gas conversion device is installed on the ground with an upper opening, the present invention improves the structure of the conventional flap valve and adds an automatic drainage mechanism, which can drain the accumulated water at the flue gas conversion valve in time and avoid air leakage or backflow when no water is drained or the drainage volume is small.

[0025] 2) The present invention adds an anti-stuck mechanism to the existing flap-type flue gas conversion valve, thereby solving the problem that the flue gas conversion valve is prone to being stuck due to excessive opening of the valve plate, resulting in failure of the flue gas conversion valve.

[0026] 3) The present invention adds a guide plate to the existing flap-type flue gas conversion valve. When the valve plate is open, it can avoid the problem of smoke entering the valve plate accommodation space (flow dead corner) to form dust accumulation and cause pollution to the environment.

[0027] Figure 1 It is a structural schematic diagram of the flap-type flue gas conversion valve in Example 1 of the present invention.

[0028] Figure 2 It is a structural schematic diagram of the flap-type flue gas conversion valve in Example 2 of the present invention.

[0029] Figure 3 It is a structural schematic diagram of the flap-type flue gas conversion valve in Example 3 of the present invention.

[0030] Figure 4It is a structural schematic diagram of the flap-type flue gas conversion valve in Example 4 of the present invention.

[0031] Figure 5 It is a structural schematic diagram of the flap-type flue gas conversion valve in Example 5 of the present invention.

[0032] Figure 6 It is a structural schematic diagram of the flap-type flue gas conversion valve in Example 6 of the present invention.

[0033] Figure 7 It is a structural schematic diagram of the flap-type flue gas conversion valve in Example 7 of the present invention.

[0034] Figure 8 It is a structural schematic diagram of the flap-type flue gas conversion valve in Example 8 of the present invention.

[0035] Figure 9 It is a structural schematic diagram of the flap-type flue gas conversion valve in Example 9 of the present invention.

[0036] Figure 10 It is a structural schematic diagram of the flap-type flue gas conversion valve in Example 10 of the present invention.

[0037] Figure: 1. Connecting pipe 2. Dust removal main pipe 3. Flap valve 31. Valve seat 32. Valve plate 33. Push rod 34. Rotating shaft 35. Bearing seat 4. Hydraulic push rod 51. Connecting pipe 52. U-shaped pipe 53. Water supply pipe 61. Drain pipe 62. Check valve 63. Automatic drain valve 71. Telescopic lever 72. Elastomer 73. Cylinder 74. Spring 75. Limit block 8. Guide plate 9. Valve plate accommodation space DETAILED DESCRIPTION

[0038] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0039] like Figures 1-10 As shown, the flap-type flue gas conversion valve described in the present invention includes a connecting pipe 1 (for docking with the smoke guide pipe) and a flap valve 3 consisting of a valve seat 31, a valve plate 32 and a push rod 33. The bottom of the connecting pipe 1 is connected to the top of the valve seat 32. The valve seat 31 is a tubular valve seat adapted to the top opening of the dust removal main pipe 2. The valve plate 32 is arranged on the top of the valve seat 31, and one end of the valve plate 32 is connected to the push rod 33; the connecting pipe 1 is provided with a valve plate accommodating space 9 on one side of the opening direction of the valve plate 32, and the bottom of the valve plate accommodating space 9 is closed by a bottom plate; the flap-type flue gas conversion valve also includes an automatic drainage mechanism and an anti-stuck mechanism; the automatic drainage mechanism is a water-sealed drainage structure or a valve-type drainage structure, which is arranged on the bottom side of the valve plate accommodating space 9; the anti-stuck mechanism is a limiting anti-stuck structure or a thrust anti-stuck structure, which is arranged on the connecting pipe 1, the valve plate 32, the push rod 33 or the dust removal main pipe 2.

[0040] The top surface of the valve seat 31 is an inclined surface, and the end close to the valve plate accommodating space 9 is the lower end; the valve plate 32 is connected to the push rod 33 through the rotating shaft 34, and the rotating shaft 34 is supported by the bearing seat 35; the space between the vertical surface where the center line of the rotating shaft 34 is located and the corresponding side wall of the connecting pipe 1 is the valve plate accommodating space 9.

[0041] The water-sealed drainage structure is composed of a connecting pipe 51, a U-shaped pipe 52 and a water outlet pipe connected in sequence. One end of the U-shaped pipe 52 is connected to the bottom of the valve plate accommodating space 9 through the connecting pipe 51, and the other end of the U-shaped pipe 52 is connected to the water outlet pipe.

[0042] The connecting pipe 51 and the water outlet pipe are both arranged horizontally, and the water outlet pipe is lower than the connecting pipe 51, and the height difference between the bottom surfaces of the two is not less than 100 mm.

[0043] The water-sealed drainage structure further includes a water supply pipe 53 , which is disposed on the top of the U-shaped pipe 52 .

[0044] The valve-type drainage structure consists of a drain pipe 61, a check valve 62 and an automatic drain valve 63. One end of the drain pipe 61 is connected to the bottom of the valve plate accommodating space 9. The check valve 62 and the automatic drain valve 63 are arranged in sequence from the inside to the outside in the drain pipe 61.

[0045] The position-limiting anti-stuck structure consists of a telescopic barrier rod 71 and an elastic body 72 (such as a rubber block); the telescopic barrier rod 71 is arranged on the valve plate 32 away from one end of the push rod 33, or on the inner wall of the connecting pipe 1; the length of the telescopic barrier rod 71 is adjustable, and the elastic body 72 is arranged at the outer end of the telescopic barrier rod 71.

[0046] The position-limiting anti-stuck structure consists of a telescopic barrier rod 71 and an elastic body 72 ; the telescopic barrier rod 71 is arranged on the push rod 33 near one end of the valve plate 32 , or on the outer wall of the dust removal main pipe 2 ; the length of the telescopic barrier rod 71 is adjustable, and an elastic body 72 is arranged on the outer end of the telescopic barrier rod 71 .

[0047] The thrust type anti-stuck structure consists of a cylinder 73, a spring 74, a limit block 75 and an elastic body 72. The spring 74 and the limit block 75 are arranged in the cylinder 73. One end of the limit block 75 extends from the cylinder 73 and the elastic body 72 is arranged at the extended end; the cylinder 73 is arranged on the valve plate 21 away from the end of the push rod 33, or on the inner wall of the connecting pipe 1.

[0048] The thrust type anti-stuck structure consists of a cylinder 73, a spring 74, a limit block 75 and an elastic body 72. The spring 74 and the limit block 75 are arranged in the cylinder 73. One end of the limit block 75 extends from the cylinder 73 and the elastic body 72 is arranged at the extended end; the cylinder 73 is arranged on the push rod 33 near one end of the valve plate 32, or on the outer wall of the dust removal main pipe 2.

[0049] The flap-type flue gas conversion valve described in the present invention also includes a guide plate 8, which is installed on the valve plate 32 or the inner wall of the connecting pipe 1. When the valve plate 32 is opened to the right position, the guide plate 8 blocks the top of the valve plate accommodating space 9.

[0050] The guide plate 8 is a steel plate.

[0051] The guide plate 8 is composed of a steel plate and a flexible plate. One end of the steel plate is connected to the valve plate 32 or the connecting pipe 1, and the other end of the steel plate is connected to the flexible plate.

[0052] When the valve plate 32 is fully opened, the angle between the guide plate 8 and the horizontal plane is greater than 50°.

[0053] When the guide plate 8 is installed on the inner wall of the connecting pipe 1, the bottom surface of the guide plate 8 is higher than the top surface height of the valve plate 32 when it is fully opened, and the height difference between the two is 5 to 10 mm.

[0054] The present invention aims to change the installation method of the flap-type flue gas conversion valve, and adds an automatic drainage mechanism, an anti-stuck mechanism and a guide plate 8 on the basis of the existing structure.

[0055] The automatic drainage mechanism is installed at the bottom of the connecting pipe 1 connected to the flue gas conversion valve and outside the valve plate 32 of the flap valve 3. The automatic drainage mechanism can adopt the following two structural forms:

[0056] 1. The water-sealed drainage structure is preferably composed of a connecting pipe 51, a U-shaped pipe 52, a water outlet pipe and a water supply pipe 53. One end of the U-shaped pipe 52 is connected to the bottom of the connecting pipe 1 (corresponding to the side of the valve plate accommodating space 9) through the horizontal connecting pipe 51, and the other end is connected to the horizontal water outlet pipe. The water supply pipe 53 is arranged at the top of the U-shaped pipe 52, preferably at the connection between the water outlet pipe and the U-shaped pipe 52. The bottom surface of the water outlet pipe is lower than the bottom surface of the connecting pipe 51, and the height difference between the two is not less than 100 mm. The U-shaped pipe 52 has a water seal function, and water can be added to the U-shaped pipe 52 through the water supply pipe 53 to ensure the water seal height in the U-shaped pipe 52 and avoid the water seal being destroyed due to the water seal height being too low.

[0057] 2. The valve-type drainage structure consists of a drain pipe 61, a check valve 62, and an automatic drain valve 63. When water accumulates at the bottom of the connecting pipe 1, the automatic drain valve 63 opens to drain the accumulated water. When there is no water at the bottom of the connecting pipe 1, the automatic drain valve 63 closes. The check valve 62 prevents the accumulated water from flowing back when the automatic drain valve 63 is open.

[0058] The anti-stuck mechanism can be selected from the following two structural forms:

[0059] 1. The limiting anti-stuck mechanism is used to limit the valve plate 32 when it rotates to the set position, so as to prevent the valve plate 32 from getting stuck and being unable to self-reposition due to the center of gravity of the valve plate 32 exceeding the vertical plane where the center line of the rotating shaft 34 is located. At this time, the anti-stuck mechanism consists of a telescopic baffle 71 and an elastic body 72. The telescopic baffle 71 can be optionally set on the connecting pipe 1, the valve plate 32, the dust removal main pipe 2 or the push rod 33. The length of the telescopic baffle 71 can be adjusted. Before installation, it should be debugged first to adjust the length of the telescopic baffle 71 to ensure that the valve seat 32 can rely on self-repositioning while maximizing the valve opening. The elastic body 72 is set at the outer end of the telescopic baffle 71 to play a buffering and protective role.

[0060] 2. The thrust-type anti-stuck mechanism is used to provide an elastic restoring force for the valve seat when the flue gas switching valve is closed. When the valve opener (such as the hydraulic push rod 4) retracts, the valve plate 32 can smoothly reset by relying on the elastic restoring force and the inertial force. At this time, the anti-stuck mechanism consists of a cylinder 73, a spring 74, a stopper 75 and an elastic body 72. The cylinder 73 can be selectively installed on the connecting pipe 1, the valve plate 32, the dust removal main pipe 2 or the push rod 33. Before installation, debugging is carried out. By adjusting the compression degree of the spring 74 in the cylinder 73, the extension length of the stopper 75 can be adjusted to ensure that the valve plate 32 can be opened to the set angle. When the hydraulic push rod 4 retracts, the valve plate 32 can be closed by relying on the rebound force of the spring 74 and the inertial force of the valve plate 32. The elastic body 72 is arranged at the outer end of the stopper 75 to play a buffering and protective role.

[0061] The guide plate 8 can be selectively installed on the valve plate 32 or the connecting pipe 1 .

[0062] When the guide plate 8 is installed on the valve plate 32 , it is required that when the valve plate 32 is opened to the maximum angle, the angle between the guide plate 8 and the horizontal plane is greater than 50° to avoid dust accumulation on the guide plate 8 .

[0063] When the guide plate 8 is installed on the valve plate 32, it is preferably composed of a steel plate and a flexible plate (such as a rubber plate). The flexible plate can be tightly attached to the inner wall of the connecting pipe 1 when the valve plate 32 is opened to the right position, closing the top of the valve plate accommodating space 9, and preventing the flue gas from entering the dead corner and forming ash accumulation.

[0064] When the deflector plate 8 is installed on the inner wall of the connecting pipe 1, the angle between the deflector plate 8 and the horizontal plane is greater than 50° to prevent dust accumulation on the deflector plate 8. To prevent collision between the deflector plate 8 and the valve plate 32, the bottom surface of the deflector plate 8 must be 5-10 mm higher than the top surface of the valve plate 32 when fully opened. To fully utilize its diversion function and prevent smoke from entering the dead angle between the valve plate 32 and the connecting pipe 1 (the valve plate accommodating space 9), the horizontal projection of the deflector plate 8 must cover the horizontal projection of the valve plate accommodating space 9.

[0065] In order to more intuitively embody the present invention, the embodiments of the present invention are further described in conjunction with examples. The following examples are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technical solution that can be obviously obtained by a person skilled in the art within the technical scope disclosed in the present invention, including simple changes or equivalent replacements, is within the scope of protection of the present invention.

[0066] [Example 1]

[0067] like Figure 1 As shown, in this embodiment, the flap-type flue gas diversion valve includes a flap valve 3 consisting of a valve seat 31, a valve plate 32, and a push rod 33. The top surface of the valve seat 31 is inclined, and the valve plate 32 is mounted on the lower end of the valve seat 31. The valve plate 32 and push rod 33 are connected by a rotating shaft 34, which is supported by a bearing seat 35. The flap-type flue gas diversion valve also has an automatic drain mechanism, an anti-seizure mechanism, and a guide plate 8.

[0068] In this embodiment, the automatic drain mechanism is installed on one side of the bottom of the valve plate accommodating space 9 in the connecting pipe 1. It utilizes a water-seal drainage structure. This structure consists of a connecting pipe 51, a U-shaped pipe 52, an outlet pipe, and a water supply pipe 53. One end of the U-shaped pipe 52 is connected to the connecting pipe 1 via the connecting pipe 51, and the other end is connected to the outlet pipe. Both the connecting pipe 51 and the outlet pipe are arranged horizontally, with the water supply pipe 53 located at the junction of the outlet pipe and the U-shaped pipe 52. The bottom of the outlet pipe is 100 mm lower than the bottom of the connecting pipe 51.

[0069] In this embodiment, the anti-jamming mechanism employs a position-limiting anti-jamming structure, which comprises a telescopic barrier rod 71 and an elastic member 72. The telescopic barrier rod 71 is arranged horizontally, with one end fixed to the inner wall of the connecting pipe 1 and the other end provided with the elastic member 72. When the valve plate 32 is fully opened, the position-limiting anti-jamming structure contacts the valve plate 32, thereby limiting the position of the valve plate 32.

[0070] In this embodiment, the deflector 8 is a flat steel plate. One end of the deflector 8 is fixed to the inner wall of the connecting pipe 1, and the other end extends downwardly and inwardly of the connecting pipe 1. The angle between the deflector 8 and the horizontal plane is 50°. The bottom surface of the deflector 8 is 8 mm away from the top surface of the fully opened valve plate 32. The deflector 8 extends to the other side of the fully opened valve plate 32.

[0071] [Example 2]

[0072] like Figure 2 As shown, the difference between this embodiment and embodiment 1 is that the automatic drainage mechanism adopts a valve-type drainage structure.

[0073] The valve type drainage structure is composed of a drain pipe 61, a check valve 62 and an automatic drain valve 63. The drain pipe 61 is installed on one side of the bottom of the connecting pipe 1, and the check valve 62 and the automatic drain valve 63 are installed in the drain pipe 61.

[0074] [Example 3]

[0075] like Figure 3 As shown, this embodiment differs from Embodiments 1 and 2 in that, in the position-limiting anti-stuck structure, one end of a telescopic stopper 71 is fixed to the valve seat 31, and the other end of the telescopic stopper 71 is provided with an elastic body 72. When the valve plate 32 is fully opened, the position-limiting anti-stuck structure contacts the inner wall of the connecting pipe 1 to limit the position of the valve plate 32.

[0076] [Example 4]

[0077] like Figure 4 As shown, this embodiment differs from Embodiments 1 and 2 in that, in the position-limiting anti-stuck structure, a telescopic stopper 71 is arranged at an angle, one end of which is fixed to the outer wall of the dust removal main pipe 2, and the other end is provided with an elastic body 72. When the valve plate 32 is opened, the position-limiting anti-stuck structure contacts the push rod 33 to limit the position of the valve plate 32.

[0078] [Example 5]

[0079] like Figure 5 As shown, this embodiment differs from Embodiments 1 and 2 in that, in the position-limiting anti-stuck structure, one end of the telescopic stopper 71 is fixed to the push rod 33 near the rotating shaft 34, and the other end is provided with an elastic body 72. When the valve plate 32 is opened, the position-limiting anti-stuck structure contacts the outer wall of the dust removal main pipe 2 to limit the position of the valve plate 32.

[0080] [Example 6]

[0081] like Figure 6 As shown, the difference between this embodiment and embodiment 1 and embodiment 2 is that the anti-jamming mechanism adopts a thrust type anti-jamming structure.

[0082] The thrust-type anti-seize structure consists of a cylinder 73, a spring 74, a stopper 75, and an elastic body 72. The cylinder 73 is horizontally arranged, with one end connected to the inner wall of the connecting pipe 1. The spring 74 and the stopper 75 are disposed within the cylinder 73. One end of the stopper 75 extends from the other end of the cylinder 73, and the elastic body 72 is disposed at the protruding end. When the valve plate 32 is fully opened, the thrust-type anti-seize structure contacts the valve plate 32 to limit the valve plate 32.

[0083] [Example 7]

[0084] like Figure 7 As shown, the difference between this embodiment and embodiment 1 and embodiment 2 is that the anti-jamming mechanism adopts a thrust type anti-jamming structure.

[0085] The thrust-type anti-seize mechanism consists of a cylinder 73, a spring 74, a stopper 75, and an elastic member 72. One end of the cylinder 73 is connected to the valve plate 32. The spring 74 and stopper 75 are located within the cylinder 73. One end of the stopper 75 extends from the other end of the cylinder 73, and the elastic member 72 is located at the extended end. When the valve plate 32 is fully opened, the thrust-type anti-seize mechanism contacts the inner wall of the connecting pipe 1, limiting the position of the valve plate 32.

[0086] [Example 8]

[0087] like Figure 8 As shown, the difference between this embodiment and embodiment 1 and embodiment 2 is that the anti-jamming mechanism adopts a thrust type anti-jamming structure.

[0088] The thrust-type anti-seizure mechanism consists of a cylinder 73, a spring 74, a stopper 75, and an elastic member 72. The cylinder 73 is tilted, with one end connected to the outer wall of the dust removal main pipe 2. The spring 74 and stopper 75 are located within the cylinder 73. One end of the stopper 75 extends from the other end of the cylinder 73, and the extended end is provided with the elastic member 72. When the valve plate 32 is fully opened, the thrust-type anti-seizure mechanism contacts the push rod 33 to limit the position of the valve plate 32.

[0089] [Example 9]

[0090] like Figure 9 As shown, the difference between this embodiment and embodiment 1 and embodiment 2 is that the anti-jamming mechanism adopts a thrust type anti-jamming structure.

[0091] The thrust-type anti-stuck structure consists of a cylinder 73, a spring 74, a stopper 75, and an elastic body 72. One end of the cylinder 73 is connected to the push rod 33. The spring 74 and stopper 75 are located within the cylinder 73. One end of the stopper 75 extends from the other end of the cylinder 73, and the elastic body 72 is located at the extended end. When the valve plate 32 is fully opened, the thrust-type anti-stuck structure contacts the outer wall of the dust removal main pipe 2, limiting the position of the valve plate 32.

[0092] [Example 10]

[0093] like Figure 10 As shown, the structure and arrangement of the guide plate 8 of this embodiment are different from those of embodiments 1 to 9.

[0094] In this embodiment, deflector plate 8 is composed of a steel plate and a flexible plate. One end of the steel plate is fixedly connected to valve plate 32, and the other end is provided with a flexible rubber plate. When valve plate 32 is fully opened, deflector plate 8 forms a 50° angle with the horizontal plane, and the flexible rubber plate is in close contact with the inner wall of connecting pipe 1.

[0095] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A flap type flue gas switching valve, characterized in that: It includes a connecting pipe and a flap valve consisting of a valve seat, a valve plate and a push rod. The bottom of the connecting pipe is connected to the top of the valve seat. The valve seat is a tubular valve seat adapted to the top opening of the dust removal main pipe. The valve plate is arranged on the top of the valve seat, and one end of the valve plate is connected to the push rod. The connecting pipe is provided with a valve plate accommodating space on one side of the valve plate opening direction, and the bottom of the valve plate accommodating space is closed by a bottom plate. The flap-type flue gas conversion valve also includes an automatic drainage mechanism and an anti-stuck mechanism. The automatic drainage mechanism is a water-sealed drainage structure or a valve-type drainage structure, which is arranged on the bottom side of the valve plate accommodating space. The anti-stuck mechanism is a limiting anti-stuck structure or a thrust anti-stuck structure, which is arranged on the connecting pipe, valve plate, push rod or dust removal main pipe.

2. The flap type flue gas switching valve according to claim 1, characterized in that: The top surface of the valve seat is an inclined surface, and the end close to the valve plate accommodating space is the lower end; the valve plate is connected to the push rod through a rotating shaft, and the rotating shaft is supported by a bearing seat; the space between the vertical surface where the center line of the rotating shaft is located and the corresponding connecting pipe side wall is the valve plate accommodating space.

3. The flap type flue gas switching valve according to claim 1, characterized in that: The water-sealed drainage structure is composed of a connecting pipe, a U-shaped pipe and a water outlet pipe connected in sequence. One end of the U-shaped pipe is connected to the bottom of the valve plate accommodating space through the connecting pipe, and the other end of the U-shaped pipe is connected to the water outlet pipe.

4. The flap type flue gas switching valve according to claim 3, characterized in that: The connecting pipe and the water outlet pipe are both arranged horizontally, and the water outlet pipe is lower than the connecting pipe, and the height difference between the bottom surfaces of the two is not less than 100 mm.

5. The flap type flue gas switching valve according to claim 3, characterized in that: The water-sealed drainage structure further includes a water supply pipe, which is arranged at the top of the U-shaped pipe.

6. The flap type flue gas switching valve according to claim 1, characterized in that: The valve type drainage structure consists of a drainage pipe, a check valve and an automatic drainage valve. One end of the drainage pipe is connected to the bottom of the valve plate accommodating space. The check valve and the automatic drainage valve are arranged in sequence from the inside to the outside in the drainage pipe.

7. The flap type flue gas switching valve according to claim 1, characterized in that: The limit-type anti-stuck structure consists of a telescopic barrier rod and an elastic body; the telescopic barrier rod is arranged on the valve plate away from one end of the push rod, or on the inner wall of the connecting pipe; the length of the telescopic barrier rod is adjustable, and the outer end of the telescopic barrier rod is provided with an elastic body.

8. The flap type flue gas switching valve according to claim 1, characterized in that: The limit-type anti-stuck structure consists of a telescopic barrier rod and an elastic body; the telescopic barrier rod is arranged on a push rod close to one end of the valve plate, or on the outer wall of the dust removal main pipe; the length of the telescopic barrier rod is adjustable, and the outer end of the telescopic barrier rod is provided with an elastic body.

9. The flap type flue gas switching valve according to claim 1, characterized in that: The thrust type anti-stuck structure consists of a cylinder, a spring, a limit block and an elastomer. The spring and the limit block are arranged in the cylinder, one end of the limit block extends from the cylinder and an elastomer is arranged at the extended end; the cylinder is arranged on the valve plate away from one end of the push rod, or on the inner wall of the valve seat.

10. The flap type flue gas switching valve according to claim 1, characterized in that: The thrust type anti-stuck structure consists of a cylinder, a spring, a limit block and an elastomer. The spring and the limit block are arranged in the cylinder, one end of the limit block extends from the cylinder and an elastomer is arranged at the extended end; the cylinder is arranged on a push rod close to one end of the valve plate, or on the outer wall of the dust removal main pipe.

11. The flap type flue gas switching valve according to claim 1, characterized in that: It also includes a guide plate, which is installed on the valve plate or the inner wall of the connecting pipe. When the valve plate is opened to the right position, the guide plate blocks the top of the valve plate accommodating space.

12. The flap type flue gas switching valve according to claim 11, characterized in that: The guide plate is a steel plate.

13. The flap type flue gas switching valve according to claim 11, characterized in that: The guide plate is composed of a steel plate and a flexible plate. One end of the steel plate is connected to the valve plate, and the other end of the steel plate is connected to the flexible plate.

14. The flap type flue gas switching valve according to claim 11, characterized in that: When the valve plate is fully opened, the angle between the guide plate and the horizontal plane is greater than 50°.

15. The flap type flue gas switching valve according to claim 11, characterized in that: When the guide plate is installed on the inner wall of the connecting pipe, the bottom surface of the guide plate is higher than the top surface height of the valve plate when it is fully opened, and the height difference between the two is 5 to 10 mm.

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