JPH09280539A - Seal mechanism for guillotine damper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an abrasion resistance and a corrosion resistance without lowering a seal effect even when being pressed by fluid pressure by providing a seal member having seal plates disposed on the peripheral edge end part of a damper blade and a back up spring for pressing both the seal plates onto the inner wall surface of a blade support frame. SOLUTION: A seal member has a pair of seal plates 2 sandwiched between seat plates 4, pressing plates 5 and fixing bolts 6 and opposed to each other. The seal member also has a back up spring 1 for pressing the seal plates 2 to a valve seat B2 formed on the inner wall surface of a blade support frame B under a spring force. When a guide piece 10 provided on the blade 3 is pressed to to one side of the blade support frame B as shown by intermediate broken lines owing to the deformation of the blade or fluid pressure, the back up spring 1 oscillates and an equal spring force is exerted on both the seal plates 2 so that both the seal plates 2 are equally and assuredly pressed to the valve seat B2 on the inner wall surface of the blade support frame B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guillotine damper device disposed in a flue duct or the like to arbitrarily block the flow of a fluid such as gas. More specifically, the present invention relates to a seal mechanism for a guillotine damper device in which the duct and the like are fully closed to prevent the movement of a fluid, thereby improving the hermeticity.

[0002]

BACKGROUND OF THE INVENTION Air,
BACKGROUND ART A flue duct for exhaust gas or the like or a damper device arranged in a flow path of another fluid is widely used for the purpose of controlling and shutting off the flow rate of a fluid such as these gases. Of these, a guillotine damper device that opens and closes a flow path by inserting and removing a damper blade is often used to shut off fluid because of its high hermeticity when fully closed. As the size of the device increases, the size of the damper blade which receives the fluid pressure and the temperature difference also increases, but it is difficult to sufficiently exert the sealing performance and the opening / closing function simply by increasing the size of the damper blade. In other words, a seal mechanism of the damper device that can prevent a reduction in the sealing effect due to the deformation caused by the fluid pressure and the temperature difference is required.

Conventionally, as a means for improving the airtightness when the flue duct or the like is fully closed, as shown in FIG. 8 (a), a seal having a substantially U-shaped cross section around the damper blade is used. The elasticity of thin sheet metal is used to attach the member and to exert its sealing effect.

Further, as another means for improving the airtightness when the flue duct is fully closed, there is disclosed an example in which a seal member having a substantially loop-shaped cross section is used as shown in FIG.
However, in this case, when the damper blade is pressed to one side by the fluid pressure, the spring force of the sealing member on the opposite side is weakened, and as a result, the sealing fluid tends to leak. In addition, since the seal member is sealed with a spring force by forming a loop shape, the seal member must be formed in a thinner plate (0.2 to 0.3 mm) in order to secure the spring force. As a result, the wear resistance and corrosion resistance cannot be improved.

Therefore, there is a demand for a damper device having a sealing mechanism in which the sealing effect is not reduced even if the damper blade is pressed against one side of the blade supporting frame by the fluid pressure, and the abrasion resistance and corrosion resistance of the sealing member are further improved. ing.

[0006] Further, when performing maintenance on the sealing member when the sealing effect is reduced, it is preferable to perform maintenance (hereinafter referred to as on-load maintenance) without stopping the operation of a series of systems. For that, at the time of on-road maintenance,
A maintenance mechanism for maintaining, managing, or maintaining the seal mechanism of the guillotine damper device that is excellent in operability without leaking the sealing fluid by opening and closing the blade is required. However, at present, a maintenance mechanism for a seal mechanism of a guillotine damper device that prevents leakage of a sealing fluid and has excellent operability has not been provided.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a backup spring which constantly and uniformly presses against the inner wall surface of a blade support frame by, for example, attaching a backup spring so as to be swingable in a direction perpendicular to a peripheral edge extending direction of a damper blade. so,
This is a seal mechanism of a guillotine damper device in which a seal plate is pressed against a valve seat on the inner wall surface of the blade support frame. Even if a damper blade (hereinafter, simply referred to as a blade) is pressed to one side by fluid pressure or the like, A seal mechanism of a guillotine damper device in which the reduction of the sealing effect is prevented and the wear resistance and corrosion resistance of the seal plate are further improved.

That is, according to the present invention, in a guillotine damper device for opening and closing a duct by sliding a damper blade, a seal member formed on a peripheral edge of the damper blade (ie, a seal mechanism in the guillotine damper device; the same applies hereinafter). The seal plate is disposed opposite to the peripheral edge of the damper blade, and the backup spring is disposed between the seal plates, and always presses the two seal plates evenly against the pedestal on the inner wall surface of the blade support frame. A seal mechanism for a guillotine damper device.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Even when a damper blade is pressed to one side by fluid pressure or the like, a backup spring uniformly presses seal plates attached opposite to each other against a pedestal on an inner wall surface of a damper blade support frame. , To prevent leakage of the blocking fluid from the gap between the seal plate and the pedestal. As means for pressing both seal plates constantly and evenly against the pedestal on the inner wall surface of the blade support frame, for example, a backup ring may be formed in a substantially U-shaped or V-shaped cross section.
At least a seal plate described later can be attached to the peripheral surface of the damper blade in a shape capable of exerting a spring force for pressing against a valve seat on the inner surface of the damper blade support frame. At this time, the attachment method between the damper blade and the backup spring is not particularly limited as long as the damper blade and the backup spring are attached so as to be swingable at least in a direction perpendicular to the blade peripheral edge extending direction. The fixed shaft attached to the surface is directly crowned by the backup spring, or
Alternatively, a backup spring can be attached to an appropriate joint member that crowns the fixed shaft. In particular, in the case where the fixed shaft has a structure in which the fixed shaft is directly crowned by the backup spring, no joint member is required, so that the number of members is reduced and cost can be reduced.

As described above, the backup spring is swingably mounted orthogonally to the direction in which the peripheral edge of the damper blade extends, so that the damper blade is pressed against one side in the blade support frame by deformation or fluid pressure. In this case, for example, the contact point between the backup spring and the seal plate is displaced by swinging of the backup spring as shown in FIG.
A spring force can be evenly applied to both seal plates to prevent a reduction in the sealing effect.

The backup ring can be cut into appropriate widths and attached to the entire surface of the blade to minimize the reduction of the sealing effect due to the deformation of the blade. A sealing effect can be obtained.

When the blade body is slid to the duct side to prevent fluid movement in the duct, the seal plate is pressed against the valve seat provided on the inner wall surface of the blade support frame by the backup spring. The purpose of this is to prevent leakage of the blocking fluid from the gap between the damper blade and the blade support frame. The means for attaching the seal plate and the damper blade can be integrated by welding or the like.However, if the sealing effect is reduced due to wear of the seal plate, the worn seal plate can be replaced. It is desirable to be detachably attached.

As described above, this seal plate is pressed against the valve seat on the inner wall surface of the blade support frame by the backup spring to prevent leakage of the sealing fluid from the gap between the seal plate and the blade support frame. Even when the damper blade is pressed against one side of its support frame due to the deformation of the blade or the influence of fluid pressure, the backup ring oscillates to displace the pressure contact point of the seal plate and It is possible to evenly press the seal plates, which are arranged in a line, to the pedestal. As a result, it is possible to provide a sealing mechanism of the damper device in which the sealing effect is not reduced even by the movement of the blade or the like.

In the above-mentioned sealing mechanism, the pressure contact of the seal plate to the valve seat is realized by a backup spring provided so as to be swingable, and a seal air is further provided between the seal plates pressed to the valve seat. Supply,
Naturally, means for pressing the seal plate against the valve seat by the gas pressure of the sheet air can be used together.

Further, the present invention also discloses, in relation to the damper device, a maintenance mechanism capable of maintaining, managing or maintaining the sealing mechanism while a series of systems including the damper device are operating.

That is, guide grooves are formed on the duct side of the inner wall surface of the damper blade storage case so as to face each other, and a band-shaped shutter having an opening and a blind plate portion is arranged in the guide groove. This is a maintenance mechanism for maintaining a seal mechanism of the guillotine damper device that slides inside the guide groove to expose the opening or the blind plate portion and arbitrarily release or close the internal space of the blade storage case.

In such a maintenance mechanism, the shutter can be slid by, for example, winding one of its ends.

This shutter has an opening portion and a blind plate portion formed in a series, and at least the opening portion has a size and shape that does not hinder the sliding of the damper blade (that is, the sliding direction of the damper blade). The blind plate portion has a shape that is equal to or larger than a vertical cross-sectional shape, and the blind plate portion has a size enough to close the blade body storage space (that is, closes the internal space of the blade support frame on the damper blade storage side). (Possible shape).

When the shutter used for on-road maintenance of the seal member formed on the peripheral edge of the blade has an opening exposed, a pressure difference occurs between the internal space of the blade storage case and the inside of the duct. There is no. Therefore, it is possible to wind the opening of the shutter for on-road maintenance, expose the blind plate portion, and easily perform the operation for closing the blade storage space.

Inspection of the seal member housed in the closed blade housing case inner space is performed, for example, by opening a door such as a manhole that can be opened and closed for maintenance at a position where the housed seal member is located on the wall surface of the blade housing space. Once formed, the seal member can be maintained. When the maintenance of the seal member is completed, the blade housing space is released by winding up the blind plate portion during the shutter to expose the opening.

In order to secure the closed state in the blade accommodating space, a pressing spring is attached in the guide groove, and the side edge of the sliding shutter is
It is desirable that the pressing spring presses against the guide groove contact surface.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to typical embodiments.

[Embodiment 1] FIG. 1 is an enlarged view of a main part showing a sealing state when a blade is moved. FIG. 2 is an enlarged cross-sectional schematic view of a main part showing a divided backup ring in a sealing mechanism. Is a schematic diagram showing a state in which the duct is fully closed.

As shown in FIG. 1, the sealing member in this embodiment has a tip bent slightly inward, a rear end sandwiched between the seat plate 4 and the holding plate 5, and a peripheral edge of the blade 3 sandwiched by fixing bolts 6. A pair of seal plates 2 attached to each other and arranged to face each other
And between the seal plates 2, is attached to a fixed shaft 7 attached to the peripheral edge of the blade 3 so as to be swingable in a direction perpendicular to the extending direction of the peripheral edge of the blade 3. The backup spring 1 presses against a valve seat B2 formed on the inner wall surface of the blade support frame B. As shown in FIG. 2, the backup spring 1 is divided into a predetermined width and is continuously provided on the entire periphery of the blade 3. The fixed shaft 7 is attached to the peripheral edge of the blade 3 integrally with its end.

In the guillotine damper device shown in this embodiment, the guide piece 10 provided on the blade 3
However, due to the deformation of the blade 3 and the influence of the fluid pressure, FIG.
As shown by the middle broken line, when pressed against one side of the blade support frame B, the backup spring 1 swings, a uniform spring force acts on both seal plates 2, and both seal plates 2 are evenly distributed. Moreover, the blade seat B can be reliably pressed against the valve seat B2 on the inner wall surface of the blade support frame B.

In the guillotine damper device shown in this embodiment, as shown in FIG. 1, a band-shaped shutter C as shown in FIG. 3 is provided in a slide groove B3 formed above the valve seat B2. It is arranged to be slidable. The shutter C is formed by connecting a blind plate portion C1 and an opening portion C2. The shutter C is pressed against the contact surface B5 of the slide groove B3 by supporting both side edges of the shutter C with pressing springs B4. doing.

The blind plate portion C1 and the opening portion C2 of the shutter C are for closing and opening the inner space of the blade housing case (that is, the inner space of the blade support frame B on the damper blade housing side; the same applies hereinafter) B1. As shown in FIG. 5, the blind plate portion C1 is wound by the winding device C3 formed on both sides of the blade support frame B where the end portion of the shutter C is located.
2, the blade storage case internal space B1 is released, and the blind plate portion C1 is exposed by winding up the opening C2.
Can be closed.

On-road maintenance of the seal member
As shown in FIG. 4, after sliding the blade 3 and the seal member into the internal space of the blade storage case, the shutter C
To expose the blind plate C1 to close the blade storage case internal space B1, open a manhole B6 formed in the blade storage side wall surface in the blade support frame, and open the seal member (the backup ring 1,
On-road maintenance of the seal plate 2 etc.) can be performed.

[Embodiment 2] FIG. 7 is an enlarged view of an essential part showing a seal mechanism in this embodiment. A backup spring is provided between seal plates, and seal air is further supplied to a seal air space 8. This is a sealing mechanism that presses the seal plate against the valve seat. In FIG. 7, 9 indicates the flow of the seal air.

In the sealing mechanism shown in this embodiment,
7 and the inner surface B7 of the blade support frame.
A seal air space is formed by the seal air space 8 and the seal air can be supplied into the seal air space 8 to press the seal plate against the valve seat by the gas pressure. The seal air space 8 is formed so that the supplied seal air does not leak into the duct.

In this embodiment, it is desirable that the pressure of the seal air supplied is higher than the pressure of the sealing fluid from the viewpoint of shutting off the liquid. Can function to assist the pressure contact of the seal plate to the valve seat by the above, so that the effect can be expected sufficiently.

[0032]

By employing the damper blade sealing mechanism of the present invention, the reduction of the sealing effect when the blade body is pressed against the blade supporting frame due to the deformation of the blade or the fluid pressure can be eliminated. . That is,
Even in such a case, it is possible to prevent the reduction of the sealing effect of the seal plate by uniformly pressing the seal plate against the valve seat on the inner wall surface of the blade support frame by swinging the backup spring in the seal member. it can.

Further, when the maintenance mechanism of the guillotine damper device is employed together with the shutter, the on-road maintenance of the seal member should be carried out easily and surely while preventing leakage of gas flowing in the duct. Will be possible.

[Brief description of drawings]

FIG. 1 is an enlarged schematic sectional view of a main part showing a sealing state when a blade is moved.

FIG. 2 is an enlarged schematic cross-sectional view of a main part showing a divided backup ring in a seal mechanism.

FIG. 3 is a schematic perspective view showing a shutter.

FIG. 4 is a schematic sectional view showing a maintenance state of the seal mechanism.

FIG. 5 is a schematic front view showing an arrangement state of a shutter.

FIG. 6 is a schematic diagram showing a state in which the duct is fully closed.

FIG. 7 is a schematic sectional view of a main part showing a seal mechanism of another embodiment.

FIG. 8 is a schematic sectional view of a main part showing a conventional sealing mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Backup spring 2 Seal plate 3 Damper blade 7 Fixed shaft 8 Seal air space B Blade support frame B1 Blade storage case internal space B2 Valve seat B3 Slide groove B4 Holding spring C Shutter C1 Blind plate portion C2 Opening C3 Winding device

Claims (7)

[Claims] A guillotine damper device that opens and closes a duct by sliding a damper blade,
A seal member formed on the peripheral edge of the damper blade has a seal plate disposed opposite to the peripheral edge of the damper blade, and a seal member disposed between the seal plates. A seal mechanism for a guillotine damper device, comprising a backup spring pressed against an inner wall surface. 2. A backup spring is mounted so as to be swingable in a direction perpendicular to the direction in which the peripheral edge of the damper blade extends, so that both seal plates are constantly and uniformly pressed against the inner wall surface of the blade support frame. Claim 1
A seal mechanism for the guillotine damper device described in the above. 3. The seal mechanism for a guillotine damper device according to claim 2, wherein the swing of the backup spring is realized by attaching the backup spring to a fixed shaft attached to the periphery of the damper blade. . 4. The guillotine damper device according to claim 1, wherein a front end of the seal plate having a rear end attached to a peripheral edge of the damper blade is formed to be curved inward. Seal mechanism. 5. A seal mechanism for a guillotine damper device according to claim 1, wherein the backup spring divided into a predetermined width is arranged around the entire circumference of the damper blade. 6. A guide groove is formed in the duct wall on the inner wall surface of the damper blade storage case so as to face each other, and a belt-shaped shutter having an opening and a blind plate portion is arranged in the guide groove. The guillotine damper device seal mechanism according to any one of claims 1 to 5, wherein, by sliding in the guide groove, the opening or the blind plate portion is exposed to freely release or close the internal space of the blade storage case. Maintenance mechanism for maintenance. 7. The slide of the shutter is realized by winding one end of the shutter, and the side edge of the shutter that slides in the guide groove is formed by:
The maintenance mechanism according to claim 6, wherein the maintenance spring is pressed against the guide groove by a pressing spring arranged in the guide groove.