JPH0810078B2 - damper - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a damper, and more particularly to a damper, which is installed in the middle or end of a blower duct so that a plurality of blades can be opened and closed in conjunction with each other to prevent fire. The present invention relates to a damper that is suitable for smoke prevention, air volume control, etc., and is intended to improve durability and reliability.

[Conventional technology]

Conventionally, a duct for ventilation is installed in a building, etc., and a damper is attached to the middle or end of this duct for air flow adjustment for air conditioning, fire prevention, and smoke prevention.When adjusting the air flow, the blades of the damper are rotated. The angle of movement is changed, and when fire and smoke are prevented, the inside of the duct is blocked by the rotation of the blades to block the flow of smoke, fire, and hot air.

FIG. 17 is a sectional view showing a schematic structure of a duct equipped with a conventional damper. In FIG. 17, reference numeral 1 is a duct attached to a building or the like, which is formed in a rectangular tube shape.

A rectangular tubular casing 2 forming a part of the damper 5 is attached to a predetermined portion of the duct 1, in the case of this example, an intermediate portion. As shown in FIG. 18, the casing 2 has substantially the same cross-sectional shape as the duct 1, and the pair of side plates 2a and 2b face each other so as to be parallel to the flow direction of the fluid in the duct 1.
Flange 1 of duct 1 through flanges 2c and 2d on duct 1
The top plate 2e and the bottom plate 2f are attached to the upper and lower ends of the pair of side plates 2a and 2b, respectively.

The top plate 2e, the side plates 2a and 2b, and the bottom plate 2f are fixed by line welding, and thus the rectangular tubular casing 2 is formed.

As shown in FIG. 19, at a predetermined position of the pair of side plates 2a, 2b, mounting portions 3 having a U-shaped cross section are attached to the side plates 2a, 2b at positions facing each other by welding.

A circular through hole 3a is provided at a predetermined position of the mounting portion 3. A brass bush 4 is fitted in the through hole 3a.

As is clear from FIG. 20, the bush 4 is formed in a short cylindrical shape, and the collar 4a is in contact with the inner surface side of the mounting portion 3.

Mounting parts 3 respectively mounted on the pair of side plates 2a, 2b
As shown in FIG. 20, both ends of the iron shaft 5a of the damper 5 are passed through the bush 4 fitted in the through hole 3a, and are axially supported by the bush 4.

A blade 5b is attached to the shaft 5a, and the shaft 5a and the blade 5b are integrally rotatable in the casing 2 in an arbitrary direction.

When the damper 5 has multiple blades, there are as many through holes as the number of blades 5b shown in FIGS. 17 and 20 in the mounting portion 3 shown in FIG.
3a is provided, the bush 4 is fitted in each through hole 3a, and the shaft 5a is pivotally supported and attached to the attachment portion 3 as shown in FIGS. 17 and 20. Blade 5b of this damper 5
Can be rotated manually or electrically, and the drive lock means of the damper 5 will be described by taking a smoke-proof damper as an example.

This drive lock means is shown in FIG. 21 in a schematic sectional view.

In FIG. 21, reference numeral 6 denotes a drive lock means, which has a hole 7a formed in one end of a fixed frame 7 formed in a tubular shape, a movable arm 8 is inserted through the hole 7a, and a locking portion is provided at one end of the movable arm 8.
8a is integrally formed. A set lever 5c provided at one end of the shaft 5a shown in FIG. 20 is locked to the locking portion 8a.

Further, a thermal fuse 9 is attached between the tip of the movable arm 8 penetrating the inside of the fixed frame 7 and the tip of the fixed frame 7.

A spring hook 8b is integrally formed at the center of the movable arm 8. A spring 10 is housed in a compressed state between the spring hook 8b and one end of the fixed frame 7, and this spring 10 is normally compressed between the spring hook 8b and the fixed frame 7 via a set lever 5c. , Shaft 5a of damper 5
Is held by the elastic force of a spring (not shown) provided in the damper 5 to keep the blades 5b open in the casing 2.

The thermal fuse 9 is adapted to detect the temperature in the duct 1, and the thermal fuse 9 is blown when the temperature rises above a predetermined temperature in the event of a fire or the like.

With this configuration, the damper 5 is
If it is a smoke-proof damper, it is blown when the temperature fuse 9 detects a temperature higher than a predetermined value. As a result, the compressive force of the spring 10 is released, and the spring 10 extends in the direction of arrow A1 in FIG. Along with this, the movable arm 8 also moves in the direction of arrow A1. As a result, the set lever 5c
Is disengaged from the locking portion 8a, and the elastic force of a spring (not shown) of the damper 5 causes the shaft 5a to be rotated while being axially supported by the bush 5, and the blade 5b to rotate in a direction to close in the casing 2 to Shut off the fluid.

[Problems to be Solved by the Invention]

However, in such a damper 5, the casing 2 is formed by line welding with the pair of side plates 2a, 2b, the top plate 2e, and the bottom plate 2f abutting against each other. For this reason, thermal expansion during welding is likely to cause deformation, and as a result, the shaft support portion of the shaft 5a cannot maintain a predetermined dimensional relationship.

Further, due to the deformation of the casing 2, the blades 5b of the damper 5 are blown by the wind during long-term use, causing “backlash” in the through-hole 3a of the mounting portion 3 and the shaft of the mounting portion 3
The shaft supporting portion of 5a is easily damaged.

The bush 4 is made of brass, while the bush
Since 5a is made of iron, there is a problem that both of them are fixed by rust during long-term use and hinders smooth operation, and the shaft 5a simply penetrates the bush 4. Therefore, if dust is mixed in the fluid, the bush 4 and the shaft 5a may be corroded during use for a long period of time due to the dust, or foreign matter may be mixed therein, so that the shaft 5a does not rotate smoothly, resulting in malfunction. There was a problem of lack of reliability.

However, in the case of the smoke proof damper and the fire proof damper, the malfunction is concerned with human life, and the lack of reliability of the damper 5 is fatal for this type of damper.

In addition, the brass bush 4 is soft and easily worn,
There is a problem that rattling, vibration, and noise are likely to occur, and that dust is likely to be mixed in due to the wear as described above from the gap between the shaft 5a and the bush 4.

When the blades 5b are multi-blades, the mechanism portion for rotating the blades 5b in conjunction with each other also corrodes during long-term use, and the portion to be rotated does not rotate smoothly or sticks. This could lead to malfunctions.

The present invention has been made in view of the above circumstances, and an object thereof is excellent in corrosion resistance, wear resistance, and vibration resistance, capable of withstanding long-term use, and simultaneously opening and closing a plurality of blades. It is to provide a damper that can be smoothly operated and does not pose a risk to human life even when applied for disaster prevention.

[Means for solving the problem]

In order to achieve the above object, the damper according to the invention described in claim 1 is a rectangular tubular casing 11 provided in a predetermined position of a duct 12 for circulating a fluid in the fluid flowing direction.
When, both side plates 11a, a plurality of pairs which are formed to face in a predetermined location of 11b holes 11a ₁ ~11a ₃ of the casing 11, 11b ₁ ~11b ₃
Cylindrical bushing 16 with excellent wear resistance and corrosion resistance
A plurality of pairs of bearing members 16 and 17 to which e is attached respectively, and the bushes 16e of the plurality of pairs of bearing members 16 and 17 are rotatably supported by the bushes 16e, and the blades 19 _{1 to} 19 ₃ are respectively provided according to the rotation angle. A plurality of shafts 18 ₁ to 18 ₃ that can be rotated in 11 to change the flow rate of the fluid and the base ends of the two metal plate members 23 ₁ a and 23 ₁ b are overlapped with each other, and the tip ends are substantially It is expanded in a U-shape, and a through hole 27 is formed at the tip thereof, and the periphery of the through hole 27 is made to project toward the facing surface side of the two plate bodies 23 ₁ a and 23 ₁ b by drawing or pressing. Tena,
The base end is fitted and fixed to each end of the plurality of shafts 18 ₁ to 18 _{3 on} the outside of the side plates 11a and 11b of the casing 11, and the plate bodies 23 ₁ a and 23 ₁ b at the tip end face each other. a plurality of arms 23 _1, 23 ₃ the short cylindrical bushing 28 is fixed with abrasion resistance and corrosion resistance between the faces, the side plates 11a, each of the arms 23 ₁ outside the 11b of the casing 11, - 23 ₃ is rotatably connected to each of the arms 23 ₁ to 23 ₃ via a connecting shaft 30 fitted into the inner peripheral surface of the bush 28, and is connected to the arms 23 ₁ to 23 ₃ via the arms 23 ₁ to 23 ₃ respectively. A connecting plate that simultaneously rotates a plurality of shafts 18 ₁ to 18 ₃
29 is provided.

In order to achieve the above-mentioned object, the damper according to the invention described in claim 2 is a rectangular tubular casing 11 provided in a predetermined position of a duct 12 for circulating a fluid, in the flowing direction of the fluid. both side plates 11a, a plurality of pairs which are formed to face in a predetermined location of 11b holes 11a ₁ ~11a ₃ of the casing 11, 11b ₁ ~
11b ₃ and a plurality of pairs of bearing members 16, 17 each having a cylindrical bush 16e having wear resistance and corrosion resistance attached thereto,
The bushes 16e of the plurality of pairs of bearing members 16 and 17 are rotatably supported by the bushes 16e, respectively, and the blades 19 to 19 are provided depending on the rotation angle.
_A plurality of shafts 18 ₁ to 18 ₃ capable of rotating ₃ inside the casing 11 to change the flow rate of the fluid, and a through hole 241 into which the shafts 18 ₁ to 18 ₃ are fitted at their tips.
Is formed, a bifurcated portion is formed in which a through hole 27 into which the connecting shaft 30 is fitted is formed in the tip end portion, and the base end is the plurality of outer side plates 11a, 11b of the casing 11. Of the shafts 18 ₁ to 18 ₃ of the arms 23 ₁ to 2 fitted and fixed to the respective ends of the shafts 18 ₁ to 18 _3.
3 ₃ and wear and corrosion resistant, with a brim 28 on one end
The short cylindrical bushes 28, 28 ₁ a, 28 ₂ a having a and the bushes 28, 28 in the through hole 291 formed at a predetermined position.
₁ a, the through hole 27 and the bush 28 282a is formed in the forked portion in a state of being positioned between the opposed surfaces of and the bifurcated portion is fitted to the position locked the Tsubagakakari, 28 ₁ a, 2
Each arm 23 ₁ by the inner peripheral surface of 8 ₂ a fitting the connecting shaft 30 and is characterized by comprising a connecting plate 29 which is connected with the tips of ~ 23 _3.

Furthermore, in order to achieve the above-mentioned object, claim 3
The damper according to the invention described in (1) is characterized in that the bush is made of a synthetic resin made of a polymer of tetrafluoroethylene.

[Action]

The damper casing configured as described above retains its initial shape without being deformed by thermal expansion because the joint portion of the pair of side plates and the top plate and the bottom plate are spot-welded. Further, since the shaft is rotatably supported by the bearing member by a bush having wear resistance and corrosion resistance, smooth operation can be ensured even during long-term use. Furthermore, by connecting a connecting plate to each end of each shaft via each arm, and driving this connecting plate,
When each shaft is simultaneously rotated via each arm, a plurality of blades are simultaneously opened and closed in the casing according to the rotation direction of the shaft.

Further, since the tip of each arm is expanded in a substantially U shape, and the bush is fitted in a state in which the periphery of the through hole formed in the tip is projected toward the inner surface side by drawing, the bush is fitted. Friction between the connecting plate and the arm is reduced,
The operation becomes smooth.

Further, the coupling plate is rotatably coupled between the two plate bodies of the arm via the bush in a state where the brim of the bush can abut on at least one outer surface of the coupling plate. The brim prevents the connecting plate from swinging in the axial direction, suppresses wear due to contact between the connecting plate and the plate body of the arm, and prevents rusting.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 is a sectional view showing the overall structure of the damper according to the present invention. Reference numeral 11 in FIG. 1 is a casing that is resistant to heat and rust and is formed in a rectangular tube shape by a thin plate material such as an alloy of aluminum and zinc (galvalume). The casing 11 of FIG. 1 is drawn thick with its plate thickness exaggerated.

As is apparent from the perspective view of FIG. 2 and the exploded perspective view of FIG. 3, the casing 11 has a pair of opposed side plates.
It is composed of 11a, 11b, a top plate 11c, and a bottom plate 11d.

Since the pair of side plates 11a and 11b have the same shape, the side plates 11a
Will be described on behalf of. Narrow width joints 11e and 11f, in which both the upper and lower edges of the side plate 11a are cut in a rectangular shape, are bent at a right angle to the inside (fluid flow side).

As shown in FIG. 4, the pair of side plates 11a and 11b are arranged so as to be parallel to the flow direction of the fluid in the rectangular duct 12.

The inner surface of the upper joint portion 11e of the pair of side plates 11a and 11b and the upper surface of the top plate 11c are in contact with each other and joined by spot welding.

Similarly, the lower surface of the bottom plate 11d is brought into contact with the upper surfaces of the lower joint portions 11f of the side plates 11a and 11b, and they are joined by spot welding.

In this way, the pair of side plates 11a, 11b, the top plate 11c, the bottom plate
A rectangular tubular casing 11 is formed by 11d.

FIG. 5 is a side view showing a state in which a damper of the present invention described later is attached, and FIG. 6 is a front view thereof. This fourth
As is clear from FIGS. 5 and 5, flanges 13 and 14 are attached to the casing 11 by spot welding in order to connect the left and right open ends to the duct 12.

The flanges 13 and 14 have the same shape, and the flange 13 will be described below as a representative.

The flange 13 has a rectangular frame shape when viewed from the front, as is clear from the front view of FIG.
It is configured by a and the connecting portion 13b, and has a cross-sectional shape of "L" shape.

The joint part 13a includes side plates 11a and 11b of the casing 11 and a top plate 11.
c, joined to the bottom plate 11d and the like by spot welding to be integrated, and bolt holes 13d are formed at predetermined intervals in the connecting portion 13b.

Through the bolt hole 13d, the flange 15 of the duct 12 is connected to the bolt hole 15a (see FIG. 6).

A plurality of pairs of through-holes 11a _{1 to} 11a ₃ and 11b _{1 to} 11b ₃ ( _{3 in the} figure) are formed in the center of the pair of side plates 11a and 11b of the casing 11.
A pair) is formed. These through holes 11a _{1 to} 11
a ₃ and 11b _{1 to} 11b ₃ are inner bearing members 16 shown in FIG. 7 (a).
It is formed in a "D" shape so as to match the shape of the slit 16a.

In each of the through holes 11a _{1 to} 11a ₃ and 11b _{1 to} 11b ₃ ,
The inner bearing member 16 is fitted outward from the inside of the side plates 11a and 11b. This inner bearing member 16 is shown in FIG.
As is clear from FIG. 7 (a), brass, etc.
It is composed of a cylindrical portion 16b having a short cylindrical shape and a collar portion 16c.
The slit 16a is formed on the outer peripheral surface of b. The slits 16a serve to prevent rotation of the inner bearing member 16 when fitted into the through holes 11a _{1 to} 11a ₃ and 11b _{1 to} 11b ₃ .

The collar portion 16c is formed by inserting the inner bearing member 16 into the through holes 11a _{1 to} 11a ₃ , 1
When fitted 1b ₁ ~11b _3, the side plates 11a, is brought into contact with the inner surface of 11b, and serves as a stopper.

A male screw 16d is engraved on the outer peripheral surface of the cylindrical portion 16b, and a bush 16e formed of cylindrical Teflon (a trade name of a synthetic resin made of a polymer of tetrafluoroethylene) is formed on the inner peripheral surface.
Is press-fitted and fixed. The bush 16e serves as a shaft bearing described later.

An O-ring 16f made of synthetic rubber, synthetic resin or the like is fitted on the inner surface of the cylindrical portion 16b in a concave portion formed near the collar portion 16c. When the shaft is inserted into the inner bearing member 16, the O-ring 16f is in close contact with the outer peripheral surface of the shaft to ensure airtightness inside and outside the side plates 11a and 11b.

The male screw 16d of the inner bearing member 16 is adapted to be engaged with the female screw 17a formed on the inner peripheral surface of the outer bearing member 17.

This outer bearing member 17 is, as is clear from FIG.
It is formed of brass into a short cylindrical shape, and the female screw 17a is engraved on the inner peripheral surface thereof, and a concave groove into which the O-ring 17b is fitted is formed.

This O-ring 17b is, like the above-mentioned O-ring 16f, for closely contacting the outer peripheral surfaces of the shafts 18 ₁ to 18 ₃ when the shaft is inserted so that the outer side and the inner side of the casing 11 are airtight. The O-rings 16f and 17b prevent the dust mixed in the gas from entering between the outer peripheral surfaces of the shafts 18 ₁ to 18 ₃ and the bush 16e.

Further, as is clear from both FIGS. 1 and 6,
Both side plates 11a, in the inner bearing member 16 and the outer bearing member 17 and 11b of stainless steel shaft of the casing 11 18 ₁
~ 18 ₃ are inserted, and vanes (damper blades) 19 _{1 to} 19 ₃ are attached to the shafts 18 ₁ to 18 _{3 at} the central portions thereof so as to rotate inside the casing 11. Blade 19 ₁ ~ 19
₃ is, due to its rotation angle, in the casing 11,
The flow rate of the fluid is adjusted and the flow (passage) of the fluid is blocked.

At one end of each of the shafts 18 ₁ to 18 ₃ , for example, a portion protruding from the side plate 11 a side to the outside, at least one of the shafts 18 ₁ to 18 ₃ , for example, the central shaft 18 ₂ is provided with the set lever 20. The set lever 20 is attached and is adapted to be engaged with the engaging portion 8a of the movable arm 8 of the drive lock means 6 shown in FIG.

Since the drive lock means 6 has already been described, the duplicate description will be omitted here.

Assuming that the damper is used as a fireproof damper, normally, the drive lock means 6 causes
To position blade 19 _{1-19 3} that does not interfere with the flow of fluid in the casing 11, i.e., as set in the state of FIG. 4, a shaft 18 is biased by a spring.

The spring is attached to a predetermined position of the shaft 18 ₂ and the side plate 11a.

Further, as is apparent from the perspective view of FIG. 8, the shafts 18 ₁ to 18 ₃ projecting to the outside of the side plate 11b of the casing 11 have through holes 24 provided at the base ends of the arms 23 ₁ to 23 _3. It has been inserted.

These arms 23 ₁ to 23 ₃ have the same configuration,
The specific configuration will be described on behalf of the arm 23 ₁ .

FIG. 9 is a side view of the arm 23 ₁ , and FIG. 10 is a front view of the arm 23 ₁ . As is clear from both FIGS. 9 and 10, the arm 23 ₁ is formed from two plate-shaped steel plates 23 ₁ a and 23 ₁ b, which are formed into a substantially elliptical shape, from the base end in the longitudinal direction. They are integrally joined by welding or the like in a state where they are piled up to almost the central portion. The through hole 24 ₁ is inserted small-diameter portion 25a integral with the connecting portion 25 of short cylindrical shape, such as by crimping, it is fitted to the two plate members 23 ₁ a, 23 ₁ b.

In addition, the connecting portion 25 is formed to have a large thickness, and one plate body 23 ₁ b
It is fixed by welding or the like.

Two screw holes are formed in the predetermined direction of the connecting portion 25 in the radial direction, and fixing screws 26 are respectively provided in these screw holes.
a and 26b are screwed together.

In this way, by configuring the connecting portion 25, the connecting portion
After penetrating one end of the shaft 18 ₁ to 25, the screw 26a, by tightening 26b, connecting portion 25 is fitted and connected to the shaft 18 _1, thus, that the arm 23 ₁ is coupled to the shaft 18 ₁ Become.

Arm 23 ₁ of the two plate bodies 23 ₁ A～23 ₁ b in the longitudinal direction of the central portion of each bent outward, by forming a tapered portion 23 ₁ c, 23 ₁ d, the two plate members The space between 23 ₁ a and 23 ₁ b is slightly widened to have a substantially U-shape.

Through holes 27 are formed in the two plate members 23 ₁ a and 23 ₁ b at positions facing each other near the tips thereof. The periphery of the through hole 27 is made to protrude annularly toward the inner surface side of the two plate members 23 ₁ a and 23 ₁ b by pressing or drawing, and the outside of the two plate members 23 ₁ a and 23 ₁ b. Has a dish-shaped recess.

A short cylindrical bush 28 shown in FIG. 11 is fitted into the through hole 27. The bush 28 is formed of a material having abrasion resistance and corrosion resistance such as Teflon described above.

This bush 28 has a through hole 29 formed in the connecting plate 29 in advance, as shown in FIG. 12, before being fitted into the through hole 27.
Insert it into ₁ .

The connecting plate 29 is also formed in a narrow plate shape with a steel plate or the like, and has a number of through holes 29 _{1 to} 29 ₃ (29) corresponding to the shafts 18 ₁ to 18 _3.
2, 29 ₃ are not shown) are provided, the through holes
The bush 28 is fitted into each of 29 _{1 to} 29 ₃ .

In this manner, with the bush 28 inserted in the through hole 29 ₁ of the connecting plate 29, the bush 28 is fitted into the through holes 27 of the two plate members 23 ₁ a and 23 ₁ b of the arm 23 ₁ , and The connecting shaft 30 shown in FIG. 1 is inserted into the bush 28.

As shown in FIG. 11, this connecting shaft 30 has a collar 30 at one end.
It has a and has a pin insertion hole 30b at the other end. This brim 30a
The connecting shaft 30 penetrates the through hole 27 coaxially with the bush 28 in a state where the arm is locked to the outside of the plate body 23 ₁ b of the arm 23 ₁ .

In this way, the connecting shaft is inserted into the bush 28 through the through hole 27.
With 30 inserted, pin insertion hole near the tip of connecting shaft 30
Insert the stop pin 31 into 30b. This locking pin 31 is
As you can see from the figure, fold the wire into a "U" shape,
One straight piece 31a is inserted into the pin insertion hole 30b, and the other piece 31b is further bent into a semicircular shape so as to have elasticity, and this elasticity prevents the stop pin 31 from coming out of the pin insertion hole 30b. To prevent.

Thus, in the state of being inserted into the through hole 29 ₁ of the pre-consolidated plate 29 a bush 28, the connecting shaft 3 to the bush 28 coaxially
Insert 0 into the through holes 27 of the plates 23 ₁ a and 23 ₁ b of the arm 23 ₁ ,
By inserting the arm 31a of the stop pin 31 into the pin insertion hole 30b, as shown in FIG.
29 is to be pivotally connected to the arm 23 _1.

By similarly connecting the connecting plate 29 to the other arms 23 ₂ and 23 ₃ as well, the connecting plate 29 is connected to the shafts 18 ₁ to 23 ₃ via the arms 23 ₁ to 23 ₃ , as shown in FIG. 18 ₃ will be connected.

Therefore, in FIG. 8, the connecting plate 29 is manually moved upward, or when the thermal fuse 9 of the drive lock means 6 is blown, the shaft 18 ₂ is rotated clockwise by the elasticity of the spring 10 shown in FIG. It is supposed to be urged.

When the shaft 18 ₂ is rotated clockwise, the connecting plate 29 moves upward via the arm 23 ₂ and the other arms 23 ₁ and 23 ₃ connected to the connecting plate 29 rotate and the shafts 18 ₂ and 18 ₂ rotate. _{3 is} also designed to rotate.

With the rotation of the shafts 18 ₁ to 18 ₃ , the blades 19 ₁ to 1 3
9 ₃ is rotated in the casing 11 at the same time, so as to adjust or cut off the flow of fluid in the casing 11.

The operation of the embodiment thus configured will be described.

Among the fireproof dampers, for example, when it is used as a smokeproof damper, an engaging piece 21 that rotates integrally with the set lever 20 on the engaging portion 8a of the movable arm 8 of the drive lock means 6 shown in FIG. (See FIG. 5) is locked to prevent the blades 19 _{1 to} 19 ₃ from being urged clockwise by the spring.
At this time, as shown in FIG. 5, the shaft is positioned in the casing 11 so as not to obstruct the flow of fluid.
18 ₁ to 18 ₃ are set.

In this state, the both ends of the shafts 18 ₁ to 18 ₃ are rotatably supported by the bush 16e of the inner bearing portion 16 and the outer peripheral surfaces of the O-rings 16f and 17b are in close contact with each other to maintain an airtight state. .

Now, when the installation position of the thermal fuse 9 exceeds a predetermined temperature, the thermal fuse 9 is melted and the movable arm 8 moves to the 14th position by the elastic force of the spring 10 in FIG. 14 as described in the [Prior Art] section. moves in the arrow A1 direction in FIG disengage the engagement piece 21 integral with the set lever 20 from the engaging portion 8a, the elastic force of the spring, rotates clockwise in the shaft 18 is a fifth diagram, the rotation of the shaft 18 ₂ force is transmitted to the coupling plate 29 through an arm 23 _2.

As a result, the connecting plate 29 is pushed upward in FIG. 8, and the arms 23 ₁ , 23 ₃ simultaneously rotate in the clockwise direction with the connecting shaft 30 of the other arms 23 ₁ , 23 ₃ as the fulcrum, and the shaft 18 ₁ , 1
8 ₃ also rotates clockwise. Along with that, the feathers 19 ₁
-19 ₃ is rotated, to cut off the flow of fluid in the casing 11.

Therefore, even if smoke is generated due to a fire, the duct
Prevent smoke from flowing back into the room.

When operating such a damper, the shafts 18 ₁ to 18
₃ is rotatably supported by a bush 16e such as Teflon, and the bush 16e made of Teflon and the shafts 18 ₁ to 18 ₃ made of stainless steel are both corrosion-resistant in material and have a friction coefficient. Since it is small and has excellent wear resistance, it can withstand long-term use sufficiently, deformation and rattling due to alteration are eliminated, and reliability is dramatically improved.

The inner bearing member 16 of the shaft 18 _{1-18 3,} in the outer bearing member 17, both O-rings 16f, because they hold the airtightness at 17b, dust contamination in the periphery of the gas shaft 18
₁ to 18 ₃ and the bush 16e do not enter the gap between them, dust adheres to the shafts 18 ₁ to 18 ₃ and the bush 16e,
There is no risk of impeding the rotational operation of the shafts 18 ₁ to 18 ₃ .

Similarly, the bush 28 that rotatably connects the arms 23 ₁ to 23 ₃ and the connecting plate 29 is also made of Teflon, has a small coefficient of friction, and prevents the connecting plate 29 and the arms 23 ₁ to 23 ₃ from rotating. Since it is performed smoothly, it is rich in wear resistance and corrosion resistance, and it does not deteriorate, so it can withstand long-term use.

Thus, according to this embodiment, the side plates 11a, 11b of the casing 11 and the top plate 11c, the bottom plate 11d by spot welding,
Since it is formed in a rectangular tube shape, deformation due to thermal strain during processing is eliminated, rattling does not occur in the rotation of the shafts 18 ₁ to 18 ₃ , and there is an advantage that vibration and unpleasant noise can be suppressed. .

Further, since the shafts 18 ₁ to 18 ₃ are formed of stainless steel, the anticorrosive effect can be expected, and the inner bearing member 16 supporting both ends of the shafts 18 ₁ to 18 ₃ is provided with a bush 16e made of Teflon. Since it is supported, it has excellent wear resistance, corrosion resistance and durability, does not require overhaul or replacement of parts, and is an O-ring.
16f, the 17b, because they hold the airtightness of the outer peripheral surface of the shaft 18 _{1-18 3} prevents intrusion of dust, without well as lubrication and excellent maintainability.

In addition, since the bush 28 that connects the arms 23 ₁ to 23 ₃ and the connecting plate 29 is also made of Teflon, there is no deterioration or deformation of the bush 28, and the connecting plate 29 and the arm 23 can be used for a long period of time.
The rotation of ₁ to 23 ₃ is also smooth, and the arms 23 ₁ to 2
3 ₃ of each plate member 23 ₁ a~23 ₁ b surrounding the plate of the through hole 27 of 23 ₁ a, 23
_Since it is projected annularly on the inner surface side of ₁ b, it is possible to reduce wear between the connecting plate 29 and the arms 23 ₁ to 23 ₃ .

Therefore, the plates 23 ₁ a and 23 ₁ b and the connecting plate 29 do not come into contact with each other to cause damage.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

For example, as the outer bearing member 17, as shown in FIG. 7 (b), it is formed in the shape of a bottomed cylindrical cap nut, has a bottom portion 17c, and has an internal threaded hole 17d formed therein, and an O-ring 17b. May be omitted.

In the case of FIG. 7 (b), since the bottom portion 17c seals the space between the inner bearing member 16 and the inner bearing member 16, dust can be prevented from entering the shaft 18 in the inner bearing member 17, and the O-ring can be prevented.
17b is not required, and cost can be reduced.

Further, as shown in FIG. 14, a collar is attached to one end of the bush 28.
28a and provided, by inserting the Konotsuba 28a into the through hole 29 ₁ of the connecting plate 29, may be caused to abut on one surface of the coupling plate 29.

In this case, a ring-shaped spacer 32 is fitted on the outer circumferential surface having no side of the bush 28 a flange 28a, the connecting plate 29 and the arm 23 _first plate member 23 connecting plate 29 between ₁ a is slid, The connecting plate 29 and the plate body 23 ₁ a are prevented from directly contacting each other. Other configurations are the same as those in FIGS. 10 and 13.

The embodiment shown in FIG. 14 has a collar at one end of the bush 28.
28a and provided, by inserting the bush 28 into the through hole 29 ₁ of the connecting plate 29, flange 28a is engaged with one surface of the connecting plate 29, collar 2
By 8a and the spacer 32, it is possible to prevent wear due to contact between the connecting plate 29 and the plate bodies 23 ₁ a and 23 ₁ b.

Further, by providing the brim 28a on the bush 28, the first
As shown in FIG. 0, there is no need to perform pressing or pressing on the peripheral portion of the through hole 27, which has the advantage of reducing the number of manufacturing steps.

Further, since the collar 28a is engaged with the coupling plate 29, insertion work into the through-hole 29 ₁ of the connecting plate 29 of the bushing 28 is facilitated, thereby improving the working efficiency.

FIG. 15, the flange 28 ₁ a, 28 ₂ a provided in one end of each of the two bushes 28 _1, 28 _2, the two bushes 28 _1, 28 ₂
Is inserted into the through-hole 29 ₁ from both sides of the connecting plate 29, and the connecting shaft 30 is inserted into the two bushes 28 ₁ and 28 ₂ with the flanges 28 ₁ a and 28 ₂ a being locked on the both sides. As shown in FIG. 11 and FIG. 13, it is inserted and the collar 30a of the connecting shaft 30 is locked to the plate body 23 ₁ b.

As a result, the bushes 28 ₁ and 28 ₂ and the connecting shaft 30 become coaxial with each other, and the bushes 28 ₁ and 28 ₂ are passed through the through holes 27 of the two plate members 23 ₁ a and 23 ₁ b, and the same as shown in FIG. Then, I am trying to stop with the stop pin 31. Other configurations are the same as those in FIGS. 10 and 13.

With this configuration, the collars 28 ₁ a and 28 ₂ a have the same function as that of the spacer interposed between the two plate members 23 ₁ a and 23 ₁ b and the connecting plate 29. Two brims 28 ₁ a, 28
₂ a may be able to suppress the swing between the two plate bodies 23 ₁ a, 23 ₁ b, it achieved the same effect as in FIG. 14.

Further, since the collar 28 ₂ a is provided, it is not necessary to separately provide the spacer 32 as shown in FIG.

Also, as shown in FIG. 16, the cylindrical portion of the inner bearing member 16
It is desirable to form a slit groove 16g at the end of 16b. According to this structure, when the bush 16e fitted in the press-fit state is replaced, the tip end portion 22a of the forceps-like jig 22 is inserted and the outer circumference of the end portion of the bush 16e is sandwiched and pulled out. It will be convenient for you.

Further, in the above-described embodiment, the damper for fire protection has been described, but the present invention is also applicable to the case where the flow rate of the air flowing through the duct 12 is adjusted according to the temperature.

In this case, instead of using the thermal fuse 9, the shafts 18 ₁ to 18 ₃ are automatically rotated appropriately in accordance with a temperature detecting means such as a thermometer and a thermostat, and the blades 19 _{1 to} 19 ₃ are placed inside the casing 11. May be rotated by a predetermined angle.

Needless to say, the shaft 18 can be rotated either manually or electrically, regardless of whether the damper 5 is used for fire protection or for adjustment.

〔The invention's effect〕

As described in detail above, according to the invention of claim 1, it has excellent wear resistance, durability, and corrosion resistance.
Maintenance such as overhaul and lubrication is unnecessary,
Moreover, a plurality of blades can be opened and closed smoothly at the same time, reliability can be improved, and in particular, the periphery of the through hole of the arm can be drawn to the facing surface side of the two plates by drawing. Therefore, it is possible to provide a damper which can further improve reliability without deleting the number of parts, simplifying the assembling, and preventing the connecting plate and the arm from being worn and rattling.

Further, according to the invention described in claim 2, since the brim is provided on the bush for pivotally supporting the connecting plate and connecting to the arm, the brim is locked to the connecting plate. It is possible to provide a damper that can be expected to be worn due to the contact of the arms, simplify the assembly work, and reduce the cost.

Furthermore, according to the invention described in claim 3, the bush is formed from a synthetic resin made of a polymer of ethylene tetrafluoride (a synthetic resin commercially available under the so-called "Teflon" trademark). Therefore, it has excellent wear resistance, corrosion resistance, and durability, and does not require maintenance such as parts replacement, overhaul, and lubrication for many years, resulting in a damper that can significantly reduce maintenance costs. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing an overall configuration of an embodiment of a damper according to the present invention, FIG. 2 is a perspective view of a casing in the same embodiment, and FIG. 3 is an exploded perspective view of the same casing.
FIG. 4 is a side view of the same casing connected to a duct, FIG. 5 is a side view of the same embodiment, FIG. 6 is a front view of the same embodiment, and FIG. 7 (a) is the same. FIG. 7 (b) is a plan view of the inner bearing member used in the embodiment, FIG. 7 (b) is a sectional view of the outer bearing member used in another embodiment of the damper according to the present invention, and FIG. 8 is the same embodiment. FIG. 9 is a side view of an arm used in the above embodiment, FIG. 10 is a front view of the same arm, and FIG. 11 is a sectional view of a bush and a connecting shaft attached to the same arm, FIG. 12 is an exploded perspective view of a connecting plate and a bush applied to the above embodiment, FIG. 13 is a side view showing a state where the connecting plate is attached to an arm applied to the above embodiment, FIG. 14 and FIG. 15 shows another embodiment of the arm and the connecting plate, which are different from each other, applied to the damper of the present invention. FIG. 16 is a perspective view showing another embodiment of the inner bearing member applied to the present invention, FIG. 17 is a sectional view showing a schematic structure of a conventional duct to which a damper is attached, and FIG. FIG. 19 is a perspective view of a casing used for a conventional damper, FIG. 19 is a perspective view showing the shape of a mounting portion used for a conventional damper, and FIG. 20 is a relationship between a conventional damper, a push, and a side plate. FIG. 21 is a front view showing a partially broken view, and FIG. 21 is a cross-sectional view showing an example of a drive lock means used for a smokeproof damper. 6 ... Drive lock means, 11 ... Casing, 11a, 11b ...
… Side plate, 11c …… top plate, 11d …… bottom plate, 11e, 11f …… joint, 12 …… duct, 13,14,15 …… flange, 16 …… inner bearing member, 16f, 17b …… O ring , 16e, 28,28 ₁ , 28 ₂ ……
Bush, 16g …… Slit slot, 17 …… Outer bearing member, 1
8 _{1-18 3} ...... shaft 19 _{1-19 3} ...... blade, 20 ...... set lever, 21 ...... engagement piece, 22 ...... jig, 23 _{1-23 3} ...... arm, 23 ₁ a to 23 ₃ b …… Plate, 24, 27, 29 ₁ …… Through hole, 25
...... Couplings, 26a, 26b ...... Screws, 29 ...... Coupling plates, 30 ......
Connection shaft, 31 …… Stop pin, 32 …… Spacer.

Claims (3)

[Claims] 1. A rectangular tube-shaped casing 11 provided in a predetermined position of a duct 12 for flowing a fluid in the flow direction of the fluid, and both side plates 11a and 11b of the casing 11 are formed so as to face each other. and a plurality of pairs of bearing members 16, 17 a cylindrical bush 16e respectively attached to the wear resistance and the hole _{11a 1 ~11a 3, 11b 1 ~11b} 3 pairs having corrosion resistance, the plurality of pairs of bearings is rotatably supported by the bush 16e of the member 16, 17 a plurality of shafts 18 _1, which may each blade 19 _{1-19 3} by changing the flow rate of the fluid is rotated in the casing 11 in accordance with the rotation angle 18 _3, the proximal end of the two metallic plate members 23 _1a, 23 _1b and heavy set, spread the tips in a substantially U-shaped, through-hole 27 as well as bored holes 27 at its distal end of the drawing or pressing a periphery becomes to protrude on the opposite side of the two plate bodies 23 _1a, 23 _1b, the End plate 11a of the casing 11, is fitted and fixed to each end of the plurality of shafts 18 _{1-18 3} in the outer 11b, resistance between the facing surfaces of the plate member 23 _1a, 23 _1b of the tip a plurality of arms 23 ₁ short cylindrical bushing 28 is fixed with a wear and corrosion resistant, and 23 _3, the side plates 11a, each of the arms 23 ₁ outside the 11b of the casing 11, to 23 ₃ of the the inner peripheral surface via the connecting shaft 30 formed by fitted into each arm 23 ₁ of the bush 28, to 23 ₃ each pivotably connected to the arm 23 _1, said plurality of shafts via a ~ 23 ₃ Connecting plate 29 that rotates 18 ₁ to 18 ₃ simultaneously
A damper comprising: 2. A rectangular tube-shaped casing 11 provided in a predetermined position of a duct 12 for flowing a fluid in the flow direction of the fluid, and both side plates 11a, 11b of the casing 11 are formed so as to face each other. and a plurality of pairs of bearing members 16, 17 a cylindrical bush 16e respectively attached to the wear resistance and the hole _{11a 1 ~11a 3, 11b 1 ~11b} 3 pairs having corrosion resistance, the plurality of pairs of bearings a plurality of shaft 18 by the bush 16e of members 16 and 17 may each vane 19-19 ₃ in accordance with the rotational angle is rotatably supported by changing the flow rate of the fluid is rotated in the casing 11 _{1-18 3} and a through hole 241 into which the shafts 18 ₁ to 18 ₃ are fitted and a through hole 27 into which the connecting shaft 30 is fitted is formed at the tip to form a bifurcated portion. And the base ends of the plurality of shafts 18 ₁ to 18 on the outside of the side plates 11 a and 11 b of the casing 11. Arm 23 which is fitted and fixed to each end of the _{3 1,} ~ 23 ₃
It has abrasion resistance and corrosion resistance, and has a brim 28a on one end side.
Of the short cylindrical bushes 28, 28 _1a , 28 _2a having the above, and the bushes 28, ₂ in the through hole 291 formed at a predetermined position.
8 _1a , 282a is inserted to the position where the brim is locked, and the through hole 27 and the bush 28, which are formed in the bifurcated portion while being positioned between the facing surfaces of the bifurcated portion, 28 _1a , 2
Each arm 23 ₁ by fitting the connecting shaft 30 to the inner peripheral surface of 8 _2a, damper, characterized by comprising a connecting plate 29 which is connected with the tips of ~ 23 _3. 3. The damper according to claim 1, wherein the bush is made of a synthetic resin made of a polymer of tetrafluoroethylene.