CN212297630U - Self-adjusting zero-leakage baffle valve - Google Patents

Abstract

A self-adjusting zero leakage flapper valve includes a valve spacer disposed within a housing; the valve partition plate is at least provided with two circulation ports and a baffle plate corresponding to the circulation ports, and a sealing element is arranged between the valve partition plate and the baffle plate; the baffle is connected with an actuating mechanism, and the actuating mechanism comprises a rotating shaft, a rotating arm and a limiting hinge; the limiting hinge part is connected between the rotating arm and the baffle and comprises a hinge seat and a hinge shaft; the limit hinge piece enables the baffle to have a certain self-adjusting swing angle relative to the rotating arm, and when the valve is closed, the baffle can swing in a self-adaptive mode, so that the stress of the sealing element is uniform, and zero leakage sealing is realized. Because the swing angle of the baffle relative to the rotating arm is limited, the baffle can be prevented from freely swinging relative to the rotating arm at a large angle, and the aim of controlling the smoke circulation area is fulfilled. The utility model discloses solved the unbalanced extrusion when closing because of the baffle from the source, and the sealing member that causes damages and wearing and tearing too fast, has effectively prolonged the life of sealing member.

Description

Self-adjusting zero-leakage baffle valve

Technical Field

The utility model relates to a heating furnace technical field especially relates to a self-adjusting zero leakage flapper valve.

Background

The flue baffle is a baffle door for regulating flow in chimneys or flues in the industries of petroleum, chemical engineering, electric power, metallurgy and the like. The oxygen content, the negative pressure and the flow of the flue gas in the hearth can be controlled by changing the opening degree of the baffle, so that the stop accident caused by flameout of the heating furnace is avoided. And along with waste heat recovery tends to the normality, hot flue gas can only be discharged to the atmosphere through heat exchange, at this moment, the flue baffle needs to be closed completely, and the hot flue gas in the heating furnace is pumped into the heat exchanger by the draught fan to be subjected to heat replacement so as to achieve the purpose of energy recycling. If the flue baffle plate leaks, cold air or replaced low-temperature flue gas can be pumped back to the heat exchanger, so that the heat exchange efficiency is reduced and energy is wasted.

The existing flue sealing baffle plate generally adopts a butterfly valve, but the butterfly valve has the defects of high manufacturing cost, heavy weight and suitability for small caliber (less than or equal to 800 mm), and cannot meet the requirement of large-scale heating furnace flue baffle plates. The shutter type flue baffle can meet the requirement of large-scale flue baffles, the existing shutter type flue baffle is provided with a plurality of baffles, and the plurality of baffles rotate around a rotating shaft under the driving of a driving mechanism to realize the opening and closing of the valve, but the shutter type flue baffle has the problem that the shutter type flue baffle cannot be completely sealed. The baffle with multiple blades and eccentric rotating shaft can solve the problems of large size and sealing of the flue baffle, but is limited by the structure, when the valve is closed, the displacement of the baffle far away from one end of the rotating shaft is larger than that of the baffle near one end of the rotating shaft. When the execution mechanism has machining errors or the height of the sealing material changes, one end of the baffle plate exerts too large pressure on the sealing material, and the other end exerts too small pressure on the sealing material, so that the sealing is not tight, and smoke gas leaks.

SUMMERY OF THE UTILITY MODEL

In order to overcome not enough in the background art, the utility model discloses a self-adjusting zero leaks flapper valve, its aim at: when the valve is closed, the baffle can be guaranteed to evenly exert pressure on the sealing element, and zero leakage sealing is realized.

A self-adjusting zero leakage flapper valve includes a valve spacer disposed within a housing; the valve partition plate is at least provided with two circulation ports and a baffle plate corresponding to the circulation ports, and a sealing element is arranged between the valve partition plate and the baffle plate; the baffle is connected with an actuating mechanism, and the actuating mechanism comprises a rotating shaft, a rotating arm and a limiting hinge; the limiting hinge part is connected between the rotating arm and the baffle and comprises a hinge seat and a hinge shaft; the limiting hinge piece enables the baffle to have a certain self-adjusting swing angle relative to the rotating arm, and when the valve is closed, the baffle can uniformly apply pressure to the sealing element.

In order to improve the technical scheme, the self-adjusting swing angle of the baffle relative to the rotating arm is A, and A is more than or equal to-10 degrees and less than or equal to 10 degrees.

In order to improve the technical scheme, the hinge seat is fixedly connected to the baffle, and the rotating arm is hinged with the hinge seat through a hinge shaft; a certain gap is reserved between the tail end of the rotating arm and the baffle, and the gap enables the baffle to have a certain self-adjusting swing angle relative to the rotating arm.

In order to improve the technical scheme, an elastic reset piece is arranged in a gap between the tail end of the rotating arm and the baffle.

In order to improve the technical scheme, the hinge seat is fixedly connected to the baffle, and the rotating arm is hinged with the hinge seat through a hinge shaft; the hinge base is provided with an elastic collision bead, the rotating arm is provided with an arc limiting groove plate, and the swinging amount of the elastic collision bead in the arc limiting groove plate enables the baffle plate to have a certain self-adjusting swinging angle relative to the rotating arm; a plurality of ball sockets corresponding to the elastic collision beads are arranged on the arc-shaped limiting groove plate; when the flap swings, the resilient catch retracts and enters the next socket.

In order to improve the technical scheme, the hinge seat is fixedly connected to the baffle, and the rotating arm is hinged with the hinge seat through a hinge shaft; the hinge seat is provided with an arc notch which takes the hinge shaft as a rotating shaft, the rotating arm is provided with a pin shaft corresponding to the arc notch, and the swinging amount of the arc notch corresponding to the pin shaft enables the baffle to have a certain self-adjusting swinging angle relative to the rotating arm.

In order to improve the technical scheme, the pin shaft is provided with a radial deformation groove; the arc-shaped notch is provided with a plurality of arc-shaped teeth at equal intervals; when the baffle swings, the arc tooth extrudes the pin shaft, so that the radial deformation groove deforms and passes through the arc tooth.

In order to improve the technical scheme, the end part of the pin shaft, which extends out of the arc-shaped notch, is provided with a thread, the thread is in threaded connection with a nut, and a spring gasket is arranged between the nut and the arc-shaped notch; when the baffle swings, the spring gasket increases the moment of resistance of the swinging of the arc notch.

In order to improve the technical scheme, the shell is a square barrel-shaped shell or a cylindrical shell; the baffle and the actuating mechanism are both arranged on one side of the valve partition plate where the medium flows.

In order to improve the technical scheme, the self-adjusting zero-leakage baffle valve is used for a flue or an air duct of a heating furnace.

Owing to adopt above-mentioned technical scheme, compare the background art, the utility model discloses following beneficial effect has:

1. when the valve is closed, the baffle can swing in a self-adaptive manner in the process of contacting with the sealing element, so that the sealing element is stressed uniformly, and zero leakage sealing is realized.

2. The swing angle of the baffle relative to the rotating arm is limited, the baffle can be prevented from freely swinging relative to the rotating arm at a large angle, and the purpose of controlling the smoke circulation area is achieved.

3. On the basis of limiting the swing angle of the baffle relative to the rotating arm, the elastic reset piece or the positioning mechanism can increase the swing resistance of the baffle, reduce the swing amount of the baffle and avoid the baffle from vibrating due to the impact of smoke gas flow.

4. The utility model discloses solved the unbalanced extrusion when closing because of the baffle from the source, and the sealing member that causes damages and wearing and tearing too fast, has effectively prolonged the life of sealing member.

Drawings

Fig. 1 is a sectional view of the present invention.

Fig. 2 is a partially enlarged view of fig. 1, showing a first embodiment of the stopper mechanism and the return mechanism.

Fig. 3 is a side sectional view of the present invention.

Fig. 4 is a partially enlarged view of fig. 3.

Fig. 5 is a top view of the present invention.

Fig. 6 is a front view of the second embodiment of the present invention.

Fig. 7 is a side view of fig. 6.

Fig. 8 is a front view of a third embodiment of the present invention.

Fig. 9 is a partially enlarged view of fig. 8.

Fig. 10 is a schematic structural view of a spring plate according to a third embodiment of the present invention.

Fig. 11 is a side view of fig. 8.

Fig. 12 is a front view of a fourth embodiment of the present invention.

Fig. 13 is a partially enlarged view of fig. 12.

Fig. 14 is a side view of a fourth embodiment of the present invention.

Fig. 15 is a front view of a fifth embodiment of the present invention.

Fig. 16 is a partially enlarged view of fig. 15.

Fig. 17 is a schematic structural view of a swinging member in a fifth embodiment of the present invention.

Fig. 18 is a front view and a side view of a swing member according to a fifth embodiment of the present invention.

Fig. 19 is a side view of fig. 15.

Fig. 20 is a front view of a sixth embodiment of the present invention.

Fig. 21 is a side view of fig. 20.

In the figure: 1. a housing; 2. a valve partition; 3. a flow port; 4. a baffle plate; 5. a seal member; 6. a rotating shaft; 7. a rotating arm; 8. a limiting hinge; 81. a hinged seat; 811. a circular arc notch; 82. hinging a shaft; 9. an elastic reset member; 10. an elastic collision bead; 11. an arc-shaped limiting groove plate; 111. a ball socket; 12. a pin shaft; 121, a carrier; a radial deformation groove; 13. a nut; 14. a spring washer.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.

The first embodiment is as follows:

a self-adjusting zero-leakage baffle valve is used for a flue of a heating furnace. As shown in fig. 1 to 5, the heating furnace comprises a housing 1, in this embodiment, a flue of the heating furnace is cylindrical, so the housing 1 is also cylindrical, a valve partition plate 2 is a circular partition plate, two circulation ports 3 are arranged on the circular partition plate 2, and the two circulation ports 3 are approximately semicircular and evenly distributed along the circumferential direction of the circular partition plate. Each of the communication ports 3 is provided with a baffle 4 for opening and closing the communication port 3, and the shape of the baffle 4 is approximately semicircular corresponding to the shape of the communication port 3. A sealing piece 5 is arranged between the circulation port 3 and the baffle plate 4, and when the flue is closed, the baffle plate 4 and the valve partition plate 2 seal the circulation port 3 through the sealing piece 5 so as to cut off the circulation of the flue gas.

Each baffle 4 is provided with a set of actuating mechanism, as shown in fig. 1, the actuating mechanism comprises a rotating shaft 6, a rotating arm 7 and a limiting hinge part 8, wherein the rotating shaft 6 is positioned at the periphery of the circulation port 3, the limiting hinge part 8 is connected between the rotating arm 7 and the baffle 4 and comprises a hinge seat 81 and a hinge shaft 82, the hinge seat 81 is fixedly connected to the baffle 4, the rotating arm 7 is hinged with the hinge seat 81 through the hinge shaft 82, and thus the baffle 4 can freely rotate around the hinge shaft 82; the rotating shaft 6 is fixedly connected with the rotating arm 7 in a key connection mode or a welding mode. In addition, each set of actuating mechanism is provided with a set of driving mechanism, the driving mechanism is arranged outside the shell, and the rotating shaft 6 is fixedly connected with the driving mechanism so as to realize the integral rotary switch of the baffle 4 around the rotating shaft 6.

It is to be noted that the flap 4 and its actuator are located on the same side of the valve partition 2. In addition, in order to avoid the problems of jamming and the like caused by the fact that the actuating mechanism is in the smoke environment for a long time, the two baffle plates 4 and the actuating mechanism are arranged on one side of the smoke outlet.

The working principle of the valve partition plate 4 and the actuating mechanism thereof is as follows: in the process of closing the valve, the displacement of the end of the baffle 4 far away from the rotating shaft 6 is larger than the displacement of the end close to the rotating shaft 6. When the processing error of the actuator exists or the height of the sealing element 5 changes, the extrusion force of one end of the baffle 4 to the sealing element 5 is too large, the extrusion force of the other end to the sealing element 5 is too small, and the reverse extrusion forces of the sealing element 5 to the two ends of the baffle 4 are also asymmetric, so that the baffle 4 rotates around the hinge shaft 82 to the end with the small extrusion force until the extrusion forces of the two ends are equal, and the sealing is finished. The baffle can swing in a self-adaptive manner in the process of closing the baffle in contact with the sealing element, so that the baffle and the sealing element are completely closed, and zero-leakage sealing is realized; meanwhile, the stress of the sealing element is ensured to be uniform, the damage and the over-fast abrasion of the sealing element are avoided, the service life is prolonged, and the economy is good.

In order to avoid that the flap 4 may swing freely about the hinge axis 82 when not in contact with the sealing member 5, a limiting mechanism must be provided to limit the swing angle of the flap 4 about the swivel arm 7. Thus, when the swing angle of the shutter 4 about the pivot arm 7 reaches a limit angle, it performs a rotational movement about the rotary shaft 6 together with the pivot arm 7. If the swing angle is not limited, the baffle 4 can be in any position, and during the opening process, on one hand, the end part of the baffle 4 can damage the surrounding heat insulation material; on the other hand, when the baffle 4 is completely opened, the baffle 4 can swing randomly along with the flue gas flow due to the nonuniformity of the flue gas flow, and the purpose of controlling the flue gas flow area by the opening angle of the baffle 4 cannot be realized.

Fig. 2 is a partial enlarged view of fig. 1, and it can be seen from fig. 2 that a small gap between the end of the rotating arm 7 and the baffle 4 is used to limit the swing angle of the baffle 4 relative to the rotating arm 7 in the present embodiment. The self-adjusting swing angle of the baffle 4 relative to the rotating arm 7 is A which is more than or equal to minus 10 degrees and less than or equal to 10 degrees. The swing angle of the baffle 4 relative to the rotating arm 7 is limited through the small-size gap between the tail end of the rotating arm 7 and the baffle, and the phenomenon that the inner wall of the shell 1 is damaged or the flow area of smoke is influenced due to the fact that the baffle 4 is too large in self-swing angle is avoided.

Example two:

as shown in fig. 6 and 7, the structure of the present embodiment is substantially the same as that of the present embodiment (not shown in the drawings), but the present embodiment is different in that the present embodiment achieves the limit by the circular arc notch 811 and the pin 12. The arc notch 811 is arranged on the hinge seat 81 and takes the hinge shaft 82 as a rotating shaft; the pin 12 corresponding to the circular arc notch 811 is disposed on the rotating arm 7, and when the edge of the circular arc notch 811 contacts the pin 12 during the swinging of the baffle 4 relative to the rotating arm 7, the rotation cannot be continued because the edge reaches the limit position. It should be added that the pin 12 in this embodiment is in the shape of a round bar, but not limited to this, and all shapes that can limit the free movement of the circular arc notch 811 are within the scope of this patent.

Compared with the first embodiment, the present embodiment has the following advantages: in the first embodiment, the end of the rotating arm 7 can cause impact injury to the surface of the baffle 4 in the process of limiting, which is not desirable; in the second embodiment, the pin 12 defines the swing angle of the baffle 4 by the free movement of the arc notch 811, which does not damage the surface of the baffle 4 and is easy to operate.

Example three:

as can be seen from fig. 8 to 11, the present embodiment has substantially the same structure as the embodiment (not shown in the drawings), and all of the spacing functions are small gaps between the ends of the rotating arms 7 and the baffle 4, but the difference is that in the present embodiment, elastic restoring members 9 are arranged in the gaps between the ends of the rotating arms 7 and the baffle 4. The elastic reset piece 9 is a flat spring piece (structure is shown in fig. 10), when the barrier 4 rotates around the rotating arm 7 due to the asymmetric extrusion of the sealing piece 5, the spring piece located therebetween is also deformed under pressure, and when the extrusion force between the barrier 4 and the sealing piece 5 is not enough to overcome the deformation force of the elastic reset piece 9, the spring rebounds to restore the barrier 4 to a state perpendicular to the rotating arm 7, so that the reset of the barrier blade is realized. It should be added that the elastic restoring member 9 is not limited to the spring plate of the present embodiment, and the structure capable of realizing the restoring function is within the protection scope of the present embodiment.

In the first embodiment and the second embodiment, after the baffle 4 completely leaves the sealing member 5, the swinging angle of the baffle 4 relative to the rotating arm 7 is uncertain, and particularly, under the action of unevenly distributed flue gas flow, the baffle 4 swings at a small angle in the air and has the oscillation property. Compared with the first embodiment and the second embodiment, the present embodiment has the following advantages: an elastic reset piece 9 is arranged in a gap between the tail end of the rotating arm 7 and the baffle plate 4, so that the uncertainty of random swinging of the baffle plate 4 in the air can be overcome.

Example four:

as can be seen from fig. 12 to 14, the present embodiment is basically the same as the second embodiment, and the difference is that: the hinged seat 81 is provided with an elastic collision bead 10, the rotating arm 7 is provided with an arc-shaped limiting groove plate 11, and the swinging amount of the elastic collision bead 10 in the arc-shaped limiting groove plate 11 enables the baffle 4 to have a certain self-adjusting swinging angle relative to the rotating arm 7; the arc-shaped limit groove plate 11 is provided with a plurality of ball sockets 111 corresponding to the elastic collision beads 10, and the matching of the elastic collision beads 10 and the ball sockets 111 ensures that the rotating angle of the baffle plate 4 relative to the rotating arm 7 can be kept for a long time under the condition that the extrusion force is not changed greatly, thereby playing a role in positioning.

When the baffle 4 swings under the extrusion of the sealing member 5, the elastic collision bead 10 compresses the spring between the elastic collision bead and the hinge seat 81, retracts, enters the next ball socket, and returns to the initial state under the action of the restoring force of the spring, and in the process, the baffle 4 swings at a small angle. Each ball socket 111 corresponds to a gear, and the balls 9.13 require additional external force from one gear to another, and when the external force is stabilized, the balls are stopped at the current position, that is, the swing angle of the baffle 4 relative to the rotating arm 7 is not changed, so that certain stability is achieved.

Compared with the first to third embodiments, the present embodiment has the following advantages: the random swinging of the baffle 4 in the first embodiment and the second embodiment is overcome, the impact damage of the end part of the rotating arm 7 to the surface of the baffle 4 in the third embodiment is overcome, and the limiting and positioning of the baffle 4 are realized.

Example five:

as can be seen from fig. 15 to 19, this embodiment has substantially the same structure as the second embodiment, except that the pin 12 is a round bar with a thread in the middle (not shown in fig. 17) and smooth ends, and the ends of the two ends are radial deformation grooves 121 (refer to fig. 17-18) with a cut-off middle part and a "U" shape, and when an external force is large enough, the radial deformation grooves 121 can be compressed to deform; the arc notch 811 is provided with a plurality of equally spaced arc teeth, and two adjacent arc teeth play a role in restricting the swing of the pin shaft 12. When the external force is large enough, the arc notch 811 extrudes the end of the pin shaft 12, so that the radial deformation groove 121 deforms, and the arc notch 811 overcomes the limitation of the arc teeth to rotate; then, the radial deformation groove 121 rebounds, so that the pin 12 is limited between the next adjacent arc teeth. In the process, the baffle 4 rotates at a small angle and is fixed at the position until new external force forces the baffle 4 to rotate continuously.

Compared with the first to fourth embodiments, the present embodiment has the following advantages: in the embodiment, only on the basis of the pin shaft 12 and the arc notch 811 which have the limiting function in the second embodiment, the structures of the pin shaft 12 and the arc notch 811 are optimized, so that the purposes of limiting and positioning can be realized simultaneously, and the structure is relatively simple.

Example six:

as can be seen from fig. 20 and 21, the present embodiment is different from the second embodiment in that: the pin 12 is a round bar with at least one end provided with threads, such as a stud, a nut 13 is screwed on at least one end of the pin 12 extending out of the notch, and a spring gasket 14 is arranged between the nut 13 and the arc notch 811.

Compared with the second embodiment, the present embodiment has the following advantages: the end part of the pin shaft 12 is in threaded contact with the arc notch 811, and the nut 13 and the spring gasket 14 increase the pretightening force between the hinge seat 81 where the arc notch 811 is located and the rotating arm 7 where the pin shaft 12 is located, increase the sliding friction force between the hinge seat 81 and the rotating arm, increase the obstacle for the free swing of the baffle 4 and avoid the random swing of the baffle. Meanwhile, the larger friction force can indirectly play a role in positioning.

It is supplementary to need, casing 1 does not confine to the cylinder casing, to the square tube casing, then thermal-insulated insulation material 2 is the square tube shape, valve baffle 2 is the rectangle baffle, is equipped with two rectangle circulation mouth 3 on the rectangle baffle, 3 evenly distributed of two circulation mouths are on the rectangle baffle. The baffle 4 is rectangular in shape corresponding to the shape of the flow opening 3. The other structure is similar to the cylindrical shell structure, and the description is omitted here.

In addition, the number of the flow openings 3 is not limited to two, that is, the number of the baffles 4 may be any number greater than two, and may be selected according to actual needs.

The utility model discloses a self-adjusting zero leakage flapper valve not only is applicable to the heating furnace flue that the circulation medium is the flue gas, is applicable to the heating furnace wind channel that the circulation medium is the air simultaneously.

The part of the utility model not detailed is prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A self-adjusting zero leakage flapper valve includes a valve spacer (2) disposed within a housing (1); the valve partition plate (2) is at least provided with two circulation ports (3) and a baffle plate (4) corresponding to the circulation ports (3), and a sealing element (5) is arranged between the valve partition plate (2) and the baffle plate (4); baffle (4) are connected with actuating mechanism, its characterized in that: the actuating mechanism comprises a rotating shaft (6), a rotating arm (7) and a limiting hinge piece (8); the limiting hinge piece (8) is connected between the rotating arm (7) and the baffle (4) and comprises a hinge seat (81) and a hinge shaft (82); the limiting hinge piece (8) enables the baffle (4) to have a certain self-adjusting swing angle relative to the rotating arm (7), and when the valve is closed, the baffle (4) can uniformly press the sealing element (5).

2. A self-adjusting zero leakage flapper valve as recited in claim 1, wherein: the self-adjusting swing angle of the baffle (4) relative to the rotating arm (7) is A which is more than or equal to minus 10 degrees and less than or equal to 10 degrees.

3. A self-adjusting zero leakage flapper valve as recited in claim 1, wherein: the hinged seat (81) is fixedly connected to the baffle (4), and the rotating arm (7) is hinged to the hinged seat (81) through a hinged shaft (82); a certain gap is reserved between the tail end of the rotating arm (7) and the baffle (4), and the gap enables the baffle (4) to have a certain self-adjusting swing angle relative to the rotating arm (7).

4. A self-adjusting zero leakage flapper valve as recited in claim 3, wherein: an elastic reset piece (9) is arranged in a gap between the tail end of the rotating arm (7) and the baffle plate (4).

5. A self-adjusting zero leakage flapper valve as recited in claim 1, wherein: the hinged seat (81) is fixedly connected to the baffle (4), and the rotating arm (7) is hinged to the hinged seat (81) through a hinged shaft (82); an elastic collision bead (10) is arranged on the hinged seat (81), an arc-shaped limiting groove plate (11) is arranged on the rotating arm (7), and the swinging amount of the elastic collision bead (10) in the arc-shaped limiting groove plate (11) enables the baffle (4) to have a certain self-adjusting swinging angle relative to the rotating arm (7); a plurality of ball sockets (111) corresponding to the elastic collision beads (10) are arranged on the arc-shaped limiting groove plate (11); when the baffle (4) swings, the elastic collision bead (10) retracts and enters the next ball socket (111).

6. A self-adjusting zero leakage flapper valve as recited in claim 1, wherein: the hinged seat (81) is fixedly connected to the baffle (4), and the rotating arm (7) is hinged to the hinged seat (81) through a hinged shaft (82); an arc notch (811) taking the hinge shaft (82) as a rotating shaft is arranged on the hinge seat (81), a pin shaft (12) corresponding to the arc notch (811) is arranged on the rotating arm (7), and the baffle (4) has a certain self-adjusting swing angle relative to the rotating arm (7) due to the swing amount of the arc notch (811) corresponding to the pin shaft (12).

7. A self-adjusting zero leakage flapper valve as recited in claim 6, wherein: the pin shaft (12) is provided with a radial deformation groove (121); the arc notch (811) is provided with a plurality of arc teeth at equal intervals; when the baffle (4) swings, the arc teeth extrude the pin shaft (12), so that the radial deformation groove (121) deforms and passes through the arc teeth.

8. A self-adjusting zero leakage flapper valve as recited in claim 6, wherein: the end part of the pin shaft (12) extending out of the arc notch (811) is provided with a thread, the thread is screwed with a nut (13), and a spring gasket (14) is arranged between the nut (13) and the arc notch (811); when the baffle (4) swings, the spring washer (14) increases the moment of resistance of the swinging of the circular arc notch (811).

9. A self-adjusting zero leakage flapper valve as claimed in any one of claims 1 to 8 wherein: the shell (1) is a square cylindrical shell or a cylindrical shell; the baffle (4) and the actuating mechanism are both arranged on one side of the valve partition plate (2) where the circulating medium exits.

10. A self-adjusting zero leakage flapper valve as recited in claim 9, wherein: used for a flue or an air duct of a heating furnace.

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