CN111219725A

CN111219725A - Air door device of defroster

Info

Publication number: CN111219725A
Application number: CN202010145226.6A
Authority: CN
Inventors: 尹成; 任轩; 任凯; 李海波; 屈荷叶; 何鹏飞; 郭纯
Original assignee: Xi'an Xikuang Environmental Protection Co ltd
Current assignee: Xi'an Xikuang Environmental Protection Co ltd
Priority date: 2020-03-04
Filing date: 2020-03-04
Publication date: 2020-06-02

Abstract

The invention relates to the technical field of air doors, and discloses an air door device of a demister, which comprises a cylinder body, an adjusting plate, an air pressure sensing device, a first connecting rod and at least one baffle plate, wherein one end of the cylinder body is provided with an air inlet for air flow to enter, the other end of the cylinder body is an air outlet, two ends of the baffle plate are respectively and rotatably connected to two side walls of the air outlet, the side wall of the cylinder body is provided with an adjusting through hole, the adjusting plate comprises a sensing part and an adjusting part fixedly connected with the sensing part, the sensing part is hinged to the adjusting through hole, the adjusting part penetrates through the adjusting through hole to be hinged to the first connecting rod, one end of the first connecting rod is hinged to the baffle plate, the other end of. The invention can automatically adjust the opening and closing of the tube bundle air door in the desulfurizing tower under the condition that the coal-fired generator set does not shut down, reduces the resource waste and the running cost loss caused by the start and the stop of the generator set, reduces the operation time and reduces the labor intensity of workers.

Description

Air door device of defroster

Technical Field

The invention relates to the technical field of air doors, in particular to an air door device of a demister.

Background

The tube bundle type demister is demisting equipment and is applied to the removal and purification of saturated flue gas or fog drops and dust particles carried by gas in various environments such as wet desulphurization towers, cyclone atomization towers, industrial waste gas and the like. The tube bundle type demister mainly depends on the characteristic that low-temperature saturated flue gas or gas at the upper part of an absorption tower contains a large amount of fine fog drops, the probability of collision between dust particles and the fog drops is increased under the condition that the large amount of fine fog drops follow the motion characteristic of air flow, and the fog drops and the dust particles collide with a volute fan blade collector under the action of the principle that the air flow moves linearly after being condensed; the liquid is converged into liquid under the action of redirection and centrifugation of the turbofan blades and flows back to the bottom of the absorption tower under the action of self gravity, so that the capture and removal of extremely tiny dust or coal dust and fog drops in the flue gas or gas are realized according to the principle, and the separation and purification of the flue gas or the gas and the fog drops are realized.

Whether the efficient demisting can be carried out is related to the flue gas speed. Influenced by the change of the operation load of the coal-fired generator set, the tube bundle demister in the desulfurizing tower often cannot reach the optimal working condition flow velocity. In order to enable the flow rate of the flue gas to reach the flow rate required by the demister, the coal-fired unit is shut down to manually plug the pipe bundle of the demister when the load of the coal-fired unit is reduced. When the load of the unit is increased, the unit needs to be stopped in advance, and the tube bundle is opened in a manual mode. Because the quantity of tube bundles often reaches hundreds, the manual opening and blocking mode is adopted, the engineering is huge, the operation time is long, and the labor intensity of workers is high. And the machine needs to be stopped before plugging and opening, so that the running loss is large.

Disclosure of Invention

The purpose of the invention is: the utility model provides an air door device of defroster, its tube bank air door switch that can be under the circumstances that coal-fired generating set does not shut down in the automatically regulated desulfurizing tower has reduced coal-fired generating set and has stopped wasting of resources and the working costs loss that produces, reduces operating time simultaneously, reduces staff's intensity of labour.

In order to achieve the aim, the invention provides a demister air door device, which comprises a cylinder, an adjusting plate, an air pressure sensing device, a first connecting rod and at least one baffle plate,

one end of the cylinder body is provided with an air inlet for air flow to enter, the other end of the cylinder body is provided with an air outlet, the two ends of the baffle plate are respectively and rotatably connected with the two side walls of the air outlet and can open or close the air outlet, the side walls of the cylinder body are provided with adjusting through holes,

the adjusting plate comprises a sensing part and an adjusting part fixedly connected with the sensing part, the weight of the sensing part is larger than that of the adjusting part, the sensing part is hinged with the adjusting through hole and can swing up and down along with the airflow in the barrel, the adjusting part penetrates through the adjusting through hole and is hinged with the first connecting rod,

one end of the first connecting rod is hinged to the baffle, the other end of the first connecting rod is connected with the air pressure sensing device, and the air pressure sensing device is installed on the outer side wall, close to the air inlet, of the barrel and can sense air pressure change in the barrel.

As preferred scheme, atmospheric pressure induction system includes the casing, connects induction plate in the casing and installs transmission assembly in the casing, the response through-hole has been seted up to the lateral wall of barrel, casing fixed mounting is in the lateral wall of barrel just encloses and establishes around the response through-hole, one side of induction plate covers on the response through-hole, the opposite side of induction plate with transmission assembly's input is connected, transmission assembly's output with the other end of first connecting rod is connected.

As the preferred scheme, the atmospheric pressure induction system still includes an at least locating plate, the locating plate is close to response through-hole and vertical installation be in on the lateral wall of casing, the locating plate pass through the spring with the opposite side of tablet is connected, the one end of spring with the tablet is connected, the other end of spring with the locating plate is connected.

As a preferred scheme, the transmission assembly comprises a gear, a horizontal rack horizontally and slidably connected in the shell and a vertically arranged vertical rack, the gear is rotatably installed in the shell, the gear is respectively meshed with the horizontal rack and the vertical rack, the horizontal rack can move back and forth along the direction perpendicular to the axis of the cylinder, the vertical rack is connected with the shell in a pluggable manner, and the top end of the vertical rack is fixedly connected with the bottom end of the first connecting rod.

Preferably, the gear is connected in the shell through a mounting shaft, two ends of the mounting shaft are rotatably connected to two side walls of the shell, and the gear is sleeved on the mounting shaft;

the horizontal rack is connected in the shell in a sliding mode through a sliding piece, the sliding piece is arranged below the mounting shaft in parallel, two ends of the sliding piece are connected with two side walls of the shell, and the top side of the sliding piece is connected with the bottom side of the horizontal rack in a sliding mode.

As a preferred scheme, the lateral wall horizontally connected with mounting panel of barrel, the mounting panel is located directly over the regulating part, the mounting panel is kept away from the one end bottom side of barrel installs first magnet, the upper surface mounting of regulating part has the second magnet, first magnet with the second magnet position corresponds and polarity is opposite, first connecting rod passes the mounting panel with the regulating part is connected.

Preferably, the first connecting rod is hinged to the baffle through a second connecting rod, a third connecting rod extends from one end of the baffle, one end, far away from the baffle, of the third connecting rod is hinged to the top end of the second connecting rod, and the bottom end of the second connecting rod is hinged to the first connecting rod.

Preferably, the number of the baffles is more than two, the baffles are mutually overlapped, the second connecting rod is hinged to the first connecting rod through a bracket, the bracket is horizontally arranged at one end of the first connecting rod, hinge positions corresponding to the baffles one to one are arranged on the top side of the bracket, and the bottom ends of the second connecting rods are arranged in the hinge positions.

Preferably, the cross-sectional area of the sensing part is larger than that of the adjusting part, and the cross-sectional shape of the sensing part is a sector.

Preferably, the pneumatic control device further comprises a protective cover, the protective cover covers the outer side of the cylinder, and the pneumatic sensing device and the first connecting rod are both located in the protective cover.

Compared with the prior art, the air door device of the demister has the advantages that: the air pressure sensing device capable of sensing pressure change in the barrel is mounted on the outer side of the barrel and hinged to a baffle rotatably mounted at the air outlet through a first connecting rod, an adjusting plate is hinged to the first connecting rod, and a sensing portion of the adjusting plate penetrates through the barrel and is located in the barrel and can sense air flow change in the barrel. This air door device of defroster installs on the tube bank, has utilized atmospheric pressure change and action of gravity ingeniously, reciprocates through the first connecting rod of response portion and atmospheric pressure induction system control, drives the baffle and at the air outlet upset, realizes opening and closing of air outlet. This air door device can be according to the air current change of tube bank, and the switch of adjusting the desulfurization tower inner tube bundle air door is accomplished automatically under the circumstances of not shutting down, has reduced coal-fired generating set and has stopped the wasting of resources and the working costs loss that produces, no longer need adopt artificial mode to open one by one or close the tube bank air door, can reduce the time of opening and shutting of air door, reduces staff's intensity of labour by a wide margin.

Drawings

FIG. 1 is a perspective view of a damper device of a demister according to an embodiment of the present invention in a closed state;

FIG. 2 is a perspective view of a demister according to an embodiment of the present invention with damper devices in an open state;

FIG. 3 is a top view of a demister according to an embodiment of the present invention with damper devices in an open state;

FIG. 4 is a schematic view of a demister damper of an embodiment of the invention with damper apparatus (with protective cover removed) in a closed position;

FIG. 5 is a schematic view of a demister damper of an embodiment of the invention with damper apparatus (with protective cover removed) in an open position;

FIG. 6 is an enlarged view at A in FIG. 5;

FIG. 7 is a schematic view of the connection structure of the baffle plate, the first connecting rod, the second connecting rod, the third connecting rod, the bracket, the adjusting plate and the transmission assembly according to the embodiment of the invention.

In the figure, 1, a cylinder; 2. a first link; 3. a baffle plate; 4. an adjusting plate; 41. a sensing part; 42. an adjustment section; 5. an air pressure sensing device; 51. a housing; 511. a top plate; 52. an induction plate; 53. a transmission assembly; 531. a gear; 532. a horizontal rack; 533. a vertical rack; 54. positioning a plate; 6. installing a shaft; 7. a slider; 71. a sliding shaft; 72. a limiting block; 8. a second link; 9. a third link; 10. a notch; 11. an opening; 12. mounting a through hole; 13. mounting a plate; 14. a limiting frame; 15. a protective cover; 16. a strut; 17. a bracket; 18. a limiting rod.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that "transverse" and "x-axis direction" are the same direction, and both refer to the axial direction of the mounting shaft. The longitudinal direction and the y-axis direction are the same direction and both refer to the moving direction of the induction plate along with the deformation of the cylinder body. The "z-axis direction" is a vertical direction.

In the description of the present invention using terms such as "central", "longitudinal", "lateral", "up", "down", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., it is to be understood that the terms such as "central", "longitudinal", "lateral", "up", "down", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are used in the present invention to indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and to simplify the description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present invention.

It should be understood that the terms "first", "second", "third", etc. are used herein to describe various information, but the information should not be limited to these terms, and these terms are only used to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 7, an air door device of a demister according to a preferred embodiment of the present invention includes a cylinder 1, an adjusting plate 4, an air pressure sensing device 5, a first connecting rod 2, and at least one baffle 3, wherein an air inlet for air to enter is formed at one end of the cylinder 1, an air outlet is formed at the other end of the cylinder 1, and the air inlet and the air outlet are communicated to form an air duct. Both ends of baffle 3 rotationally connect the both sides wall at the air outlet respectively, can open or close the air outlet, the lateral wall of barrel 1 is equipped with adjusting hole, regulating plate 4 include response portion 41 and with response portion 41 fixed connection's regulating part 42, the weight of response portion 41 is greater than the weight of regulating part 42, response portion 41 is articulated with adjusting hole, and can be along with the air current luffing motion in the barrel 1, regulating part 42 passes adjusting hole and is articulated with first connecting rod 2, the one end of first connecting rod 2 is articulated with baffle 3, the other end of first connecting rod 2 is connected with atmospheric pressure induction system 5, atmospheric pressure induction system 5 installs the lateral wall that is close to the air intake at barrel 1, can respond to the atmospheric pressure change in the barrel 1.

Based on the technical scheme, the barrel 1 has a supporting effect on the whole air door device. The cylinder 1 is arc-shaped and has openings 11 at both ends thereof for fitting the tube bundle of the tube bundle mist eliminator. The cylinder 1 is vertically arranged, and the bottom end of the cylinder is an air inlet which can be covered on the tube bundle. In order to install the air door device of the demister on the tube bundle, in practical application, the installation position matched with the top end of the tube bundle can be arranged at the position, close to the air outlet, of the tube body 1, so that the air door device is convenient to install and replace. The top of barrel 1 is the air outlet, and the inside of barrel 1 is the air duct of air current circulation. Two ends of the baffle 3 are hinged on two side walls of the barrel 1 close to the air outlet. The baffle 3 overturns to realize the opening and closing of the air outlet. The sensing portion 41 and the adjusting portion 42 of the adjusting plate 4 are integrally formed. The adjusting through hole is rectangular and is used for the adjusting plate 4 to pass through, and a rotating shaft is arranged in the adjusting through hole and is hinged with the adjusting plate 4. When the sensing part 41 swings up and down under the influence of the change of the airflow inside the cylinder 1 and the self gravity, the adjusting part 42 outside the cylinder 1 is driven to move in the direction opposite to that of the sensing part 41. One end of the adjusting part 42 far away from the cylinder body 1 is provided with a notch 10 with a U-shaped cross section and an opening 11 with a rectangular longitudinal section. First connecting rod 2 is vertical to be set up, and its top is articulated with baffle 3, and the middle part horizontally connected with branch 16 of first connecting rod 2, first connecting rod 2 pass this U type breach 10, realize that first connecting rod 2 passes regulating part 42 and is connected with atmospheric pressure induction system 5. The strut 16 is hinged in the opening 11, enabling the first connecting rod 2 to be hinged with the adjusting plate 4. The air pressure sensing device 5 is arranged at the outer side of the bottom of the cylinder body 1.

The initial state of the air door device of the demister is that the air outlet of the cylinder body 1 is closed. When the load of the coal-fired unit is increased to reach the rated load, the air volume of flue gas passing through the desulfurizing tower is increased, and the air volume passing through a single tube bundle in the desulfurizing tower is also increased. Because of the air outlet is closed, after the air current got into barrel 1, the inside pressure increase of barrel 1, the small deformation of barrel 1 is sensed to atmospheric pressure induction system 5, controls first connecting rod 2 and moves down, drives the 3 upsets of baffle with first connecting rod 2 articulated, realizes opening of air outlet. When the baffle 3 rotates to a certain angle, the air pressure in the cylinder 1 starts to decrease, and the air flow circulating in the cylinder 1 pushes the sensing part 41 to swing upwards, so that the adjusting part 42 continues to swing downwards, the first connecting rod 2 continues to move downwards, and finally the air outlet is completely opened. In the present embodiment, when the bottom end of the first link 2 is located at the lowest position, the baffle 3 forms an angle of 85 ° with the horizontal plane. When the load of the coal-fired unit is reduced, the wind speed in the tube bundle starts to be reduced, and the wind pressure applied to the induction part 41 starts to be reduced. Because the weight of the sensing part 41 is greater than that of the adjusting part 42, the sensing part 41 starts to rotate reversely under the influence of the dead weight and swings downwards to drive the adjusting part 42 to swing upwards, the first connecting rod 2 moves upwards along with the first connecting rod, and meanwhile, the baffle 3 hinged with the first connecting rod 2 reversely overturns to return to the original closed position. The air door device of the demister provided by the invention is simple in structure, is arranged on the tube bundle, skillfully utilizes the air pressure change and the gravity effect, enables the first connecting rod 2 to move up and down, drives the baffle 3 to turn over at the air outlet, realizes the opening and closing of the air outlet, can automatically complete the opening and closing of the air door of the tube bundle in the desulfurizing tower under the condition of no shutdown according to the air flow change of the tube bundle, and reduces the resource waste and the running cost loss caused by the starting and stopping of a coal-fired generator set. The invention does not need to adopt a manual mode to open or close the tube bundle air doors one by one, can reduce the opening and closing time of the air doors and greatly reduce the labor intensity of workers.

The air pressure sensing device 5 includes a housing 51, a sensing plate 52, and a transmission assembly 53 installed in the housing 51. The side wall of the cylinder body 1 is provided with an induction through hole, and the induction through hole is rectangular. The shell 51 is close to the air outlet and is fixedly arranged on the outer side wall of the barrel 1. The housing 51 is surrounded by four plates. In order to attach to the cylinder 1, the housing 51 has an arc shape on the side thereof that is close to the cylinder 1, and the arc shape is the same as the arc shape of the cylinder 1. The housing 51 surrounds the sensing through holes and has a longitudinal cross-sectional area greater than or equal to the area of the sensing through holes. One side of the sensing plate 52 covers the sensing through hole, and is capable of being vertically adhered to the outside of the cylinder 1 in an initial state, sensing the pressure change of the cylinder 1, and is slidable in the housing 51. The direction in which the sensing plate 52 moves with the pressure change of the cylinder 1 is defined as a longitudinal direction, i.e., a y-axis direction, and the direction perpendicular to the longitudinal direction is a transverse direction, i.e., an x-axis direction, and the center line of the sensing plate 52 is located on the y-axis and perpendicular to the x-axis. The up-down direction is defined as the z-axis direction. One side of tablet 52 covers on the response through-hole, and the periphery butt is connected at the lateral wall of barrel 1, and the opposite side of tablet 52 is connected with transmission unit 53's input, and under initial condition, reserve a small segment clearance between tablet 52 and the transmission unit 53, guarantee that tablet 52 has one section idle stroke. The output end of the transmission assembly 53 is connected with the other end of the first link 2. Barrel 1 is because of inside atmospheric pressure changes, and when the air outlet of barrel 1 was closed, the air current was piled up in barrel 1, and barrel 1 inside atmospheric pressure is great, and barrel 1 outwards expands, and behind the great atmospheric pressure of sensing board 52, to barrel 1 outside direction longitudinal movement, after removing a small segment idle stroke, sensing board 52 contact drive assembly 53 to drive assembly 53 and move, make first connecting rod 2 move down. After the air outlet is opened, the air pressure in the cylinder body 1 is recovered to be normal, the cylinder body 1 contracts, the induction plate 52 induces the deformation of the cylinder body 1, and the deformation reversely moves in the y-axis direction and is close to the central axis of the cylinder body 1. The air pressure sensing device 5 senses the air pressure change inside the cylinder 1 by using the sensing plate 52, so as to achieve the effect of driving the first connecting rod 2 to move upwards on the z axis. The air pressure sensing device 5 further comprises at least one positioning plate 54, the positioning plate 54 is close to the sensing through hole and is vertically installed on the side wall of the housing 51, the positioning plate 54 is connected with the other side of the sensing plate 52 through a spring, the spring is located between the sensing plate 52 and the positioning plate 54, one end of the spring is connected with the sensing plate 52, and the other end of the spring is connected with the positioning plate 54. In the present embodiment, the sensing plate 52 and the positioning plate 54 are each rectangular parallelepiped in shape, and the number of the positioning plates 54 is four, which are respectively disposed at four corners of the sensing plate 52, so that the moving distance of the sensing plate 52 can be uniformly defined. The spring is a compression return spring, and the sensing plate 52 can reciprocate in the housing 51 under the action of external force by the elastic force of the spring. When the cylinder 1 expands outward due to a large air pressure, the sensor plate 52 moves outward of the cylinder 1, and the spring is compressed. When the air pressure in the cylinder 1 returns to normal, the sensing plate 52 returns to the original position under the action of the spring. The spring and positioning plate 54 arrangement facilitates the return of the sensing plate 52.

Specifically, the transmission assembly 53 includes a gear 531, a horizontal rack 532 horizontally slidably connected in the housing 51, and a vertically arranged vertical rack 533, wherein the gear 531 is rotatably mounted in the housing 51, the gear 531 is respectively engaged with the horizontal rack 532 and the vertical rack 533, and the horizontal rack 532 can move back and forth in the direction perpendicular to the axis of the cylinder 1, i.e., in the y-axis direction. The vertical rack 533 is connected to the housing 51 in a pluggable manner, and can move back and forth in the z-axis. The housing 51 includes a top plate 511, a mounting through hole 12 is formed on the top plate 511, and the top end of the vertical rack 533 passes through the mounting through hole 12 to be fixedly connected with the bottom end of the first connecting rod 2. When the device is installed, a certain gap is reserved between the horizontal rack 532 and the induction plate 52. Therefore, when the outlet is closed, a certain distance is left between the end of the horizontal rack 532 close to the induction plate 52 and the induction plate 52. When the air pressure in the cylinder 1 increases, the pushing induction plate 52 moves towards the outside of the cylinder 1 in the y-axis direction, and then pushes the horizontal rack 532, the horizontal rack 532 moves to drive the gear 531 engaged with the horizontal rack to roll, the gear 531 rolls to drive the vertical rack 533 to move downwards, so that the first link 2 moves downwards along with the horizontal rack, and the baffle 3 hinged to the first link 2 overturns. When the air pressure in the cylinder 1 is reduced, the sensing plate 52 starts to be reset by the spring force, and at this time, the horizontal rack 532 is kept still. When the wind speed in the tube bundle is reduced and the air pressure from the bottom to the top received by the sensing part 41 is reduced, the sensing part 41 swings downwards under the influence of the dead weight to drive the adjusting part 42 to move upwards, the first connecting rod 2 moves upwards to drive the vertical rack 533 to move upwards, the gear 531 rotates in the opposite direction, and the horizontal rack 532 moves towards the inner side of the cylinder 1 and finally keeps at the initial position. The transmission assembly 53 is sufficiently meshed with the gear 531 and the rack, the transmission ratio is accurate, the transmission efficiency is high, the service life is long, the transmission is stable, and the reliability is high. The gear 531 is coupled in the housing 51 by a mounting shaft 6, and the axial direction of the mounting shaft 6 is the x-axis direction. The both ends of installation axle 6 rotationally connect at the both sides wall of casing 51, and gear 531 suit is on installation axle 6, and gear 531 rotates and can drive installation axle 6 and rotate. The horizontal rack 532 is slidably connected in the housing 51 through a slider 7, the slider 7 is arranged below the mounting shaft 6 in parallel, two ends of the slider 7 are connected with two side walls of the housing 51, and the top side of the slider 7 is slidably connected with the bottom side of the horizontal rack 532. The sliding member 7 includes two sliding shafts 71 parallel to the mounting shaft 6, and both ends of the sliding shafts 71 are rotatably connected to both side inner walls of the housing 51, and when the horizontal rack 532 moves, the sliding shafts 71 are driven to roll. The sliding shaft 71 is provided with a limit block 72, one side of the limit block 72 is abutted against the side surface of the horizontal rack 532 to limit the horizontal rack 532, so that the horizontal rack 532 can only move back and forth in the y-axis direction.

More specifically, the outer side wall of the cylinder 1 is horizontally connected with a mounting plate 13, the cross section of the mounting plate 13 is rectangular, and the cross section of one end of the mounting plate, which is far away from the cylinder 1, is circular arc. The mounting plate 13 is located directly over the regulating part 42, a limiting through hole is formed in one end, away from the barrel 1, of the mounting plate 13, and the first connecting rod 2 penetrates through the limiting through hole in the mounting plate 13 to be connected with the regulating part 42. In order to ensure that the parts such as the sensing part 41, the sensing plate 52 and the transmission assembly 53 can automatically return to the original positions after each operation, a first magnet is installed on the bottom side of one end of the mounting plate 13, which is far away from the cylinder 1, and the first magnet is circular or annular. The upper surface of the adjusting portion 42 is mounted with a second magnet having a sheet shape. The first magnet and the second magnet correspond in position and are opposite in polarity. When the load of the coal-fired unit is reduced, the wind speed in the pipe bundle begins to be reduced, the wind pressure of the sensing part 41 begins to be reduced, and the sensing part 41 begins to reverse under the action of gravity and swings downwards. When the second magnet on the adjusting part 42 is close to the first magnet on the mounting plate 13, the two magnets generate attraction force to firmly attract the adjusting part 42 and the mounting plate 13. The reverse rotation of the sensing part 41 drives the adjusting part 42 to be lifted, so that the first connecting rod 2 moves reversely, and the baffle 3 is closed. At the same time, the vertical rack 533 moves upward, and the horizontal rack 532 is reset by the engagement of the gear 531.

Preferably, the first connecting rod 2 is hinged with the baffle 3 through a second connecting rod 8, a third connecting rod 9 extends from one end of the baffle 3 close to the first connecting rod 2, and the third connecting rod 9 is L-shaped. One end of the third connecting rod 9 far away from the baffle 3 is hinged with the top end of the second connecting rod 8, and the bottom end of the second connecting rod 8 is hinged with the first connecting rod 2. The up-and-down movement of the first connecting rod 2 can drive the second connecting rod 8 to rotate in the vertical direction, so that the third connecting rod 9 rotates around the y axis, and the baffle 3 is driven to overturn. The number of baffle 3 is more than two, and the edge of baffle 3 is equipped with 45 chamfers, and each baffle 3 overlap joint each other has certain leakproofness when guaranteeing that the air outlet is closed. The baffle 3 is longer the closer to the axis of the barrel 1. In the present embodiment, the number of baffles 3 is 8, and the baffles can be divided into two groups, each group having 4 baffles 3. The turning directions of the two groups of baffles 3 are opposite. The two groups of third connecting rods 9 are symmetrically arranged to ensure that the turning directions of the baffle 3 are opposite. The second connecting rod 8 is hinged with the first connecting rod 2 through a bracket 17, and the shape of the bracket 17 is circular arc. Bracket 17 level setting is on the top of first connecting rod 2, and the top side of bracket 17 is equipped with the articulated position with each baffle 3 one-to-one, and the bottom of second connecting rod 8 is installed in articulated position, realizes that each second connecting rod 8 that links to each other with each baffle 3 all is connected with the top of first connecting rod 2. The second connecting rod 8 can rotate by taking the hinge position as a circle center. The provision of the bracket 17 ensures that each baffle 3 rotates simultaneously with the movement of the first link 2. Two ends of the bracket 17 extend downwards to form limiting rods 18, two limiting frames 14 are mounted on the outer side wall of the barrel 1, and the two limiting rods 18 of the bracket 17 are inserted into the two limiting frames 14 respectively and are in vertical sliding connection with the limiting frames 14. The spacing bracket 14 is used to limit the height of the bracket 17. When the first link 2 moves down, the bracket 17 moves down, and the bracket 17 drives the second link 8 and the third link 9 to rotate. When the bracket 17 is at the lowest position, the stopper bar 18 is fully inserted into the stopper frame 14.

It should be noted that the cross-sectional area of the sensing portion 41 is larger than that of the adjusting portion 42, and the cross-sectional shape of the adjusting portion 42 is rectangular, so that the processing is easy. The cross section of the induction part 41 is in a fan shape or a crescent shape, and the radian of the induction part is matched with the radian of the inside of the cylinder 1. The cross-sectional area of the sensing part 41 is large, which is beneficial for the sensing part to sense the airflow and the wind direction and swing along with the airflow and the wind direction.

In addition, the air door device of the demister further comprises a protective cover 15, the protective cover 15 covers the outer side of the cylinder 1, and the air pressure sensing device 5 and the first connecting rod 2 are both located in the protective cover 15. Because the air stream from the demister contains a high level of humidity and is associated with milligram-sized dust, extended operation of the damper apparatus can pose a risk of fouling associated moving parts. The protective cover 15 is provided to protect the air pressure sensing device 5 and the first link 2.

The working process of the invention is as follows: the initial state of the air door device of the demister is that the baffle 3 at the air outlet is in a closed state. When the load of the coal-fired unit is increased to reach the rated load, the air volume of flue gas passing through the desulfurizing tower is increased, and the air volume passing through a single tube bundle in the desulfurizing tower is also increased. Because the air outlet is in a closed state, no circulating air flow is generated in the cylinder body 1, but the pressure in the cylinder body 1 is increased, so that large pressure is generated on the side wall of the cylinder body 1, and the induction plate 52 is pushed to move outwards and extrude the spring. After the induction plate 52 moves for a certain stroke, the induction plate starts to contact the horizontal rack 532 and pushes the horizontal rack 532 to move outwards, and the gear 531 rolls to drive the vertical rack 533 to move downwards. The vertical rack 533 moving downward drives the first link 2 and the bracket 17 to also move downward, so that the mounting plate 13 and the adjusting portion 42 are no longer attracted by the magnetic force of the first magnet and the second magnet, and the adjusting portion 42 is broken away from the bottom side of the mounting plate 13. The second link 8 and the third link 9 rotate, and the shutter 3 starts to open. When the baffle 3 is turned over to a certain angle, the air pressure in the cylinder 1 starts to decrease, the circulating wind speed starts to increase, and the induction plate 52 starts to reset under the action of the elastic force of the spring after the air pressure decreases. The air flow circulating from bottom to top in the cylinder body 1 starts to push the sensing part 41 to be lifted, the first connecting rod 2 and the bracket 17 continue to move downwards, the baffle 3 continues to rotate, and finally the baffle 3 is completely opened, the included angle between the baffle 3 and the horizontal plane is the largest, and the balance is achieved. When the load of the coal-fired unit is reduced, the wind speed in the cylinder 1 starts to be reduced, the wind pressure borne by the sensing part 41 starts to be reduced, the gravity of the sensing part 41 starts to act and move downwards, the adjusting part 42 moves upwards, the bracket 17 is lifted, and the baffle 3 is reversely closed. While the regulating portion 42 comes closer to the mounting plate 13. When the first magnet and the second magnet come close, the magnetic force starts to act. In addition, the vertical rack 533 moves upward, and the gear 531 turns over, thereby driving the horizontal rack 532 to be reset.

To sum up, the embodiment of the invention provides an air door device of a demister, wherein an air pressure sensing device capable of sensing pressure change in a cylinder body is arranged on the outer side of the cylinder body, the air pressure sensing device is hinged with a baffle rotatably arranged at an air outlet through a first connecting rod, the first connecting rod is hinged with an adjusting plate, and a sensing part of the adjusting plate penetrates through the cylinder body and is positioned in the cylinder body to sense the change of air flow in the cylinder body. This air door device of defroster installs on the tube bank, has utilized atmospheric pressure change and action of gravity ingeniously, reciprocates through the first connecting rod of response portion and atmospheric pressure induction system control, drives the baffle and at the air outlet upset, realizes opening and closing of air outlet. This air door device can be according to the air current change of tube bank, and the switch of adjusting the desulfurization tower inner tube bundle air door is accomplished automatically under the circumstances of not shutting down, has reduced coal-fired generating set and has stopped the wasting of resources and the working costs loss that produces, no longer need adopt artificial mode to open one by one or close the tube bank air door, can reduce the time of opening and shutting of air door, reduces staff's intensity of labour by a wide margin.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An air door device of a demister is characterized by comprising a cylinder body, an adjusting plate, an air pressure sensing device, a first connecting rod and at least one baffle plate,

2. The demister damper device according to claim 1, wherein the air pressure sensor includes a housing, a sensor plate connected in the housing, and a transmission assembly installed in the housing, the side wall of the cylinder has a sensor through hole, the housing is fixedly installed on the outer side wall of the cylinder and surrounds the sensor through hole, one side of the sensor plate covers the sensor through hole, the other side of the sensor plate is connected to the input end of the transmission assembly, and the output end of the transmission assembly is connected to the other end of the first connecting rod.

3. The demister damper apparatus of claim 2, wherein the air pressure sensing device further comprises at least one positioning plate which is adjacent to the sensing through hole and vertically mounted on the side wall of the housing, the positioning plate is connected to the other side of the sensing plate through a spring, one end of the spring is connected to the sensing plate, and the other end of the spring is connected to the positioning plate.

4. The demister damper apparatus of claim 2, wherein the transmission assembly includes a gear, a horizontal rack horizontally slidably connected in the housing, and a vertically disposed vertical rack, the gear is rotatably mounted in the housing, the gear is respectively engaged with the horizontal rack and the vertical rack, the horizontal rack can move back and forth along a direction perpendicular to the axis of the cylinder, the vertical rack is connected with the housing in a pluggable manner, and the top end of the vertical rack is fixedly connected with the bottom end of the first connecting rod.

5. The demister damper apparatus of claim 4, wherein said gear is connected to said housing by a mounting shaft, both ends of said mounting shaft are rotatably connected to both side walls of said housing, and said gear is fitted over said mounting shaft;

6. The demister damper apparatus of claim 1, wherein a mounting plate is horizontally connected to an outer side wall of the cylinder, the mounting plate is located directly above the adjusting portion, a first magnet is mounted on a bottom side of one end of the mounting plate, which is far away from the cylinder, a second magnet is mounted on an upper surface of the adjusting portion, the first magnet and the second magnet are correspondingly arranged and have opposite polarities, and the first connecting rod passes through the mounting plate and is connected with the adjusting portion.

7. The demister damper apparatus of claim 1, wherein the first link is hinged to the baffle plate by a second link, a third link extends from one end of the baffle plate, an end of the third link remote from the baffle plate is hinged to a top end of the second link, and a bottom end of the second link is hinged to the first link.

8. The demister damper apparatus of claim 7, wherein the number of said baffle plates is two or more, each of said baffle plates overlaps with each other, said second link is hinged to said first link by a bracket, said bracket is horizontally disposed at one end of said first link, a top side of said bracket is provided with hinge positions corresponding one-to-one to each of said baffle plates, and a bottom end of said second link is installed in said hinge positions.

9. The demister damper apparatus of any one of claims 1-8, wherein the cross-sectional area of the sensing portion is greater than the cross-sectional area of the conditioning portion, and the cross-sectional shape of the sensing portion is a sector.

10. The demister damper apparatus of any one of claims 1-8, further comprising a protective cover covering an outside of the barrel, the air pressure sensing device and the first connecting rod being located within the protective cover.