JPS6015987Y2 - Large-diameter damper with complete isolation structure - Google Patents

Description

[Detailed description of the invention] This invention is designed to be installed in gas flow paths such as low-pressure large-diameter flues in cement, oil refining, petrochemical, steel, general chemical industry plants, etc. Regarding large diameter dampers.

Conventionally, it has been difficult to completely block flowing gas using a large-diameter damper.

Generally, types of large-diameter dampers include louver dampers,
Butterfly dampers, flap dampers, and slide dampers are used, but among these, louver dampers and butterfly dampers are often used for adjusting air volume, not for closing purposes.

Dampers used for the purpose of closing gas flow paths such as flues are flap dampers and slide dampers.

Both conventional flap dampers and slide dampers do not provide satisfactory results in completely closing the flowing gas when they have large diameters, and there is always some air leakage.

Since the present invention is mainly applied to flap dampers, the disadvantages of conventional large-diameter flap dampers will be described.

1 and 2 schematically show the structure of a conventional large-diameter flap damper.

The flap damper 3 includes a damper motor 4, a damper drive mechanism 5. 6. 7. 8, damper blade 9, casing 10
, a backing part 11, and a backing 12,
In the diagram, A shows the damper open state, and B shows the damper closed state. When the damper is closed, the lever of the damper drive mechanism 8 is moved to the damper blade 9.
is pushed into the backing 12 of the backing part 11, and the backing 12 is deformed to stop leakage and close the gas flow path.

In a large-diameter flap damper, the damper blade 9 also has a large diameter and is manufactured by welding a large number of steel plates, so that welding distortion occurs, causing the damper blade 9 to warp or warp.

Although it is not impossible to machine the contact portion of the damper blade 9 with the backing, it requires a large special machine tool and is not practical.

Therefore, the damper blade 9 is usually used after being corrected to some extent by removing strain using a hydraulic press or the like.

Therefore, a large force is required to press the damper blade 9 against the backing 12 to bring it into close contact with the backing 12. Especially in the case of a large-diameter damper, the contact area between the damper blade 9 and the backing 12 is large. 8
As a practical matter, it is impossible with the rotational force of the damper motor 4 to deform the damper blade 9 to the degree of distortion at the time of manufacture and bring it into close contact with the backing 12 by pushing with the lever.

Therefore, with such a large-diameter damper, it has not been possible to completely close off the flowing gas.

On the other hand, however, there are many cases where it is necessary to completely close the flow path of harmful gases, high temperature gases, and other gases, and there has been a demand for a damper that can completely shut off the flow path.

The present invention uses the normal closing mechanism of a large-diameter flap damper, and at the same time adds a device that further pulls the damper blade 9 to locally deform the distorted damper blade 9, and the damper blade 9 and the backing 12. The object of the present invention is to provide a large-diameter damper that has a simple structure and can completely shut off the parts by completely contacting them.

The present invention is a large-diameter damper for a gas flow path, in which a large number of anchor metal fittings are attached to the outer periphery of the damper blade near the seal portion on the seal surface side of the blade, and a flexible backing is attached to the damper seat in the damper casing. A stopper having a height lower than the backing is arranged in parallel, and an opening and a tension device mounting seat are provided in the outer wall at a position facing each of the anchor hardware,
A large-diameter damper with a completely cut-off structure, characterized in that it is equipped with a number of removable tensioning devices that locally pull the seal portion of the damper blade through locking devices that engage with each of the anchor metal fittings. be.

The anchor hardware installation position provided on the damper blade 9, that is, the part where the damper blade 9 is pulled, is between the damper blade 9 and the backing 1.
It is better to have it closer to the contact part with 2, and the design can be adjusted according to the actual situation.

Figures 3 to 5 show embodiments of the invention.

FIG. 3 is a partial sectional view of the simplest embodiment using bolts and nuts.

A large number of hooks 20 are attached to the damper blade 9 as anchor hardware near the sealing portion.

In the casing 10, a flexible backing 12 and a stopper 24 having a lower height than the backing 12 are arranged side by side on the damper seat.

FIG. 3 shows a state in which the blade 9 pulled by the hook 20 presses against the backing 12 and comes into contact with the stopper 24.

The outer wall of the casing 10 at a position facing the anchor hardware (hook) 20 is provided with an opening and a mounting seat for a screw type tension device.

Note that the opening is covered when the tensioning device is not used (that is, when the damper is open), and FIG. 3 schematically shows the lid and the holder for holding the lid.

A hook bolt 21 is locked to each hook 20 and a backing plate 22
By assembling the and nut 23, a locking device and a tensioning device are constructed.

By turning the nut 23 and pulling the hook 20 until the damper blade 9 hits the stopper 24, the damper blade 9
The backing 12 is strongly pressed to form an airtight state, and the fluid flow path is completely blocked.

In the embodiment shown in FIGS. 4 and 5, an anchor hardware consisting of a plurality of headed pins 25 is formed on the damper blade 9, and a chuck 26 is used as a locking device.

30 is a tensioning device for pulling this chuck 26, exemplifying a fluid pressure cylinder, which is connected to the chuck 26 with a pin,
It is attached to the casing 10.

When the chuck 26 moves forward, it is regulated by the guide plate 28 and compresses the spring 27 to open the tip, as shown in FIG.

After the damper blade is closed 1, when the tension device 30 pulls the chuck 26 in the state shown in FIG.
5 and pulls the damper blade 9, the damper blade 9 is strongly pressed against the backing 12.

The stopper 24 is arranged in parallel with the backing 12 and is lower in height than the banking 12 as shown in FIG.
This limits excessive traction on the damper blades after the seal is compressed.

The number of tensile devices (21, 22, 23) and 30 required is determined according to the diameter of the damper, and for example, in a circular damper with a diameter of 200 mm, about 16 locations are provided around the circumference. has an extremely good blocking effect.

Since this tensioning device is arranged over the entire circumference of the damper blade 9, no matter how large the diameter of the damper becomes, the damper blade 9 and the backing 12 are tightly adhered to each other around the entire circumference, and the flowing gas can be kept in close contact with the damper blade 9 and the backing 12. can be completely blocked.

The anchor metal fitting provided on the damper blade 9 and the locking tool that locks it are the hooks, hook bolts, pins,
It is not limited to a chuck, but any shape can be designed, and the tensioning device can be a screw, a screw jack, a hydraulic cylinder, a cam mechanism, a rope or a chain device, or an electromagnetic device.

The damper of this invention can be opened and closed by remote control, and sequence control can be easily realized by interlocking the operation of the complete shutoff mechanism of this invention according to the opening and closing of the damper, and it can also be used as an emergency shutoff valve. be.

With this invention, a large-diameter damper for a gas flow path is made by simply improving the conventional damper, thereby ensuring that no special machining is required and no matter how large the diameter is, the gas can be reliably removed. We were able to obtain a large-diameter damper that can completely block the flow path.

Although there is a great need for dampers that can completely shut off toxic gases, high-temperature fluid gases, etc., the present invention has made it possible to completely shut off large-diameter dampers, which was previously impossible, and is highly effective.

[Brief explanation of drawings]

Figure 1 is a sectional view showing the structure of a conventional large-diameter damper;
The figure is taken along the line II in FIG. 1, and FIGS. 3 to 5 are partial sectional views showing an embodiment of the present invention. 1.2... Gas flow path, 3... Damper,
4... Damper motor, 5, 6, 7.8...
...Damper drive mechanism, 9...Damper blade, 10
... Casing, 11 ... Backing part, 12 ... Backing, 20 ... Anchor gold (hook), 21 ... Hook bolt,
22...Packing plate, 23...Nuts, 2
4...Stopper, 25...Anchor hardware (headed pin), 26...Chuck, 27.
... Spring, 28 ... Guide plate, 3
0...Tension device.

Claims (1)

[Scope of utility model registration request] In a large-diameter damper for a gas flow path, a large number of anchor metal fittings are attached to the damper blade on the outer periphery of the sealing surface of the blade near the seal part, and the damper casing has a flexible backing attached to the damper seat and a flexible backing that is higher than the backing. A low stopper is arranged in parallel, and an opening and a tension device mounting seat are provided in the outer wall at a position facing each of the anchor hardware, and the damper blade is sealed via a locking device that engages with each of the anchor hardware. A large-diameter damper with a completely cut-off structure, characterized by being equipped with a number of removable tension devices that locally pull the parts.