JPH0788966B2 - damper - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a damper, and more specifically, it is installed in the middle or end of a blower duct and is suitable for fire prevention, smoke prevention, air volume control, etc. The present invention relates to a damper designed for improvement 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. 10 is a sectional view showing a schematic configuration of a duct equipped with a conventional damper. In FIG. 10, reference numeral 1 denotes 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 duct 5 is attached to a predetermined portion of the duct 1, in the case of this example, an intermediate portion. As shown in FIG. 11, the casing 2 has substantially the same cross-sectional shape as the duct 1, and the pair of side plates 2a, 2b face each other so as to be parallel to the flow direction of the fluid in the duct 1 and are connected to the duct 1. Flange 1a, 1b of duct 1 through flange 2c, 2d
The top plate 2e and the bottom plate 2f are in contact with 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. 12, mounting portions 3 having a U-shaped cross section are attached to predetermined positions of the pair of side plates 2a, 2b by welding at positions facing each other of the side plates 2a, 2b.

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 apparent from FIG. 13, 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.

As shown in FIG. 13, both ends of the iron shaft 5a of the damper 5 are passed through the bushes 4 fitted into the through holes 3a of the mounting portions 3 attached to the pair of side plates 2a and 2b, respectively. I try to support it.

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, the number of the blades 5b shown in FIGS. 10 and 13 corresponds to the number of the through holes 3a in the mounting portion 3 shown in FIG.
The bush 4 is fitted into each through hole 3a,
As shown in FIGS. 10 and 13, the shaft 5a is rotatably mounted on the mounting portion 3. The blade 5b of the damper 5 can be rotated manually or electrically.
The drive lock means of No. 1 will be described by taking a smoke damper as an example.

This drive lock means is shown in FIG. 14 in a schematic sectional view.

In FIG. 14, 6 is a drive lock means, which has a hole 7a formed at one end of a cylindrical fixed frame 7, into which a movable arm 8 is inserted, and a locking portion is provided at one end of the movable arm 8. 8a
Are integrally formed. The set lever 5c provided at one end of the shaft 5a shown in FIG. 13 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. Between this spring hook 8b and one end of the fixed frame 7,
The spring 10 is stored in a compressed state, and in a normal state, the spring 10 is compressed between the spring hook 8b and the fixed frame 7, and the shaft 5a of the damper 5 is provided on the damper 5 via the set lever 5c (not shown). The blade 5b is kept open in the casing 2 against the elasticity of the spring.

The thermal fuse 9 is adapted to detect the temperature inside the duct 1, and when the temperature exceeds a predetermined temperature, the thermal fuse 9 is blown.

With this configuration, assuming that the damper 5 is, for example, a smoke-proof damper, when the temperature fuse 9 detects a temperature equal to or higher than a predetermined value, it is blown. 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 that, the movable arm 8
Also moves in the direction of arrow A1. As a result, the set lever 5c is disengaged from the engaging portion 8a, the shaft 5a is rotated by the bush 5 by the elastic force of the spring (not shown) of the damper 5, and the blade 5b is rotated in the direction to close in the casing 2. It moves and shuts off the fluid in the duct 1.

[Problems to be Solved by the Invention]

However, in such a damper, 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.

In addition, 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 5a of the bush 3 portion. The shaft support part is easily damaged.

The bush 3 is made of brass, while the shaft 5a
Since it is made of iron, there is a problem that both are fixed by rust during long-term use and hinders smooth operation, and the shaft 5a simply penetrates the bush 3. If dust is mixed into the fluid, the bush 3 and the shaft 5a will be corroded during use for a long period of time due to the dust, or foreign matter will be mixed into the shaft, so that the shaft 5a will not rotate smoothly, leading to malfunctions. There was a problem of lack of sex.

However, in the case of a smoke-proof damper or a disaster prevention damper, it is life-threatening, and the lack of reliability of the damper 5 is fatal for this kind of damper.

Further, the brass bush 4 is soft and easily worn, and rattling, vibration, and noise are easily generated. Due to this wear, dust is mixed in from the gap between the shaft 5a and the bush 4 as described above. There was a problem that it was easy to do.

The present invention has been made in view of the above circumstances, and a first object thereof is excellent in corrosion resistance, wear resistance, and vibration resistance,
The purpose of the present invention is to provide a damper that can withstand long-term use and does not endanger human life even when applied for disaster prevention.

A second object of the present invention is to provide a damper which can prevent the entry of dust and thus prevent the friction between the bush and the shaft.

Further, a third object is to provide a damper that can simplify the constituent parts, reduce costs associated therewith, and have high reliability.

[Means for Solving the Problems]

In order to achieve the first object, the damper of the invention according to claim 1 has a rectangular cylindrical casing provided in a predetermined portion of a duct for flowing a fluid in the fluid flowing direction, and both sides of the casing. A pair of inner bearing members that are respectively fitted from inside into holes formed at predetermined positions of the plate so as to face each other, and bushes and O-rings that have wear resistance and corrosion resistance are attached to the inner peripheral surface, A pair of outer bearing members for fixing the inner bearing member to the side plates by screwing the inner bearing members from the outside of the side plates respectively, and the bushes of the pair of inner bearing members to enable rotation. It is characterized in that it is provided with a shaft which is supported by a shaft and which can change the flow rate of the fluid by rotating the blade in the casing according to the rotation angle.

Further, in order to achieve the second object, the damper of the invention according to claim 2 has a through hole in the outer bearing member, and an O ring that is in close contact with the outer peripheral surface of the shaft on the inner peripheral surface. It is characterized by that.

In order to achieve the third object, the damper according to claim 3 is configured such that the outer bearing member has a bottomed tubular shape and is screwed to the inner bearing member with a cap nut that does not allow the shaft to penetrate. It is characterized by.

[Work]

In the damper of the invention according to claim 1 configured as described above, since the casing is spot-welded to the joint portion of the pair of side plates and the top plate and the bottom plate, deformation due to thermal expansion does not occur. , The shaft retains its initial shape, the shaft is rotatably supported by the wear-resistant and corrosion-resistant bushing of the inner bearing member, and the O-ring is in close contact with the outer peripheral surface of the shaft, causing dust mixed in the fluid. It acts to prevent inflow between the shaft and bush.

In the damper according to the second aspect of the invention, the O-ring of the outer bearing portion also comes into close contact with the outer peripheral surface of the shaft, and acts to prevent dust from entering between the shaft and the bush.

Further, in the damper of the invention as set forth in claim 3, since the outer bearing member is a cap nut, the shaft is sealed by the inner bearing member and the outer bearing member outside the casing, and the shaft and the bush are separated from each other. It acts to prevent dust from entering the.

〔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 11a and 11b.
And a top plate 11c and a bottom plate 11d.

Since the pair of side plates 11a and 11b have the same shape, the side plate 11a will be described as a representative. Both the upper edge and the lower edge of the side plate 11a are cut into a rectangular shape, and the projecting strip-shaped joints 11e and 1f are bent inward (at the side where the fluid flows) at a right angle.

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 top plate
The upper surfaces of 11c are joined and joined by spot welding.

Similarly, the lower surface of the bottom plate 11d is joined to the upper surface of the joint portion 11f on the lower side 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 11
A rectangular tubular casing 11 is formed by d.

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 fifth
As is clear from FIGS. 6 and 6, 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.
The flange 13 will be described as a representative.

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

The joint portion 13a is a side plate 11a, 11b of the casing 11, a top plate 11c,
It is joined by spot welding to the bottom plate 11d etc.
Bolt holes 13d are formed in the connecting portion 13b at predetermined intervals.

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

At a substantially central portion of the pair of side plates 11a and 11b of the casing 11,
Through holes 11a and 11b _{1 are} formed. These through holes 11a ₁ , 1
1b ₁ is formed in a “D” shape so as to match the shape of the slit 16a of the inner bearing member 16 shown in FIG. 7.

In the through holes 11a ₁ and 1b ₁ , the inner bearing member 16 is provided with the side plate 11a.
It is fitted from the inside of a, 11b toward the outside. As is apparent from FIGS. 1 and 7, the inner bearing member 16 is made of brass or the like and is composed of a short cylindrical tube portion 16b and a flange portion 16c. 16a is formed. The slits 16a serve to prevent rotation of the inner bearing member 16 when fitted into the through holes 11a ₁ and 1b ₁ .

The flange portion 16c, when fitted into the through holes 11a ₁ and 11b ₁ of the inner bearing member 16, contacts the inner surfaces of the side plates 11a and 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. It is fixed by press fitting. 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 maintain 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.

As is apparent from FIG. 1, the outer bearing member 17 is formed of brass into a short cylindrical shape, and the inner peripheral surface thereof has the above-mentioned female thread.
17a is engraved and a concave groove into which the O-ring 17b is fitted is formed.

The O-ring 17b, like the O-ring 16f, is for closely contacting the outer peripheral surface of the shaft when the shaft is inserted so that the outside and the inside of the casing 11 are airtight. The rings 16f and 17b are configured to prevent dust mixed in gas or the like from entering between the outer peripheral surface of the shaft and the bush 16e.

Further, as is clear from both FIGS. 5 and 6, the stainless steel shaft 18 in the inner bearing member 16 and the outer bearing member 17 of both side plates 11a and 11b of the casing 11 is inserted. At the center of the shaft 18, blades (damper blades) 19 are attached so as to rotate inside the casing 11. The blades 19 adjust the flow rate of the fluid and block the flow (passage) of the fluid in the casing 11 depending on the rotation angle.

A set lever 20 is attached to one end of the shaft 18, for example, a portion projecting outward from the side plate 11a side. The set lever 20 is engaged with the movable arm 8 of the drive lock means 6 shown in FIG. The stopper 8a is adapted to be locked.

Since the drive lock means 6 has already been described,
Avoid duplicate explanations here.

Assuming that the damper is used as a disaster prevention damper, normally, the drive lock means 6 causes the blades 19 to be positioned so as not to prevent the fluid in the casing 11 from flowing.
That is, the shaft 18 is biased by the spring so as to be set in the state shown in FIG.

The spring is attached to the shaft 18 and the side plate 11a at predetermined positions.

The operation of the embodiment thus configured will be described.

Among the disaster prevention dampers, for example, when it is used as a smoke prevention damper, an engaging piece that rotates integrally with the set lever 20 on the locking portion 8a of the movable arm 8 of the drive / lock means 6 shown in FIG. 21 is locked to prevent the blade 19 from being urged clockwise by the spring. At this time, as shown in FIG. 5, the shaft 18 is set in the casing 11 so as not to interfere with the fluid flow.

In this state, the inner bearing 16
Is rotatably supported by the bush 16e of and both O-rings 1
The outer peripheral surfaces are closely attached by 6f and 17b, and the airtight state is maintained.

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. After moving in the direction of arrow A1 in the figure, the engaging piece 21 integral with the set lever 20 is disengaged from the locking portion 8a, and the elastic force of the spring causes the shaft 18 to rotate clockwise in FIG. 19 rotates to block the flow of fluid in the casing 11.

Therefore, even if smoke is generated due to a fire, the smoke is prevented from flowing back into the duct 12.

When such a damper is operated, the shaft 18 is rotatably supported by a bush 16e such as Teflon, and both the bush 16e made of Teflon and the shaft 18 made of stainless steel have material corrosion resistance. In addition, since it has a small friction coefficient and is therefore highly resistant to abrasion, it can withstand long-term use sufficiently and is free from deformation and rattling due to alteration.

Further, in the inner bearing member 16 and the outer bearing member 17 of the shaft 18, both O-rings 16f and 17b maintain the airtightness, so that dust mixed in the surrounding gas is in the gap between the shaft 18 and the bush 16e. There is no possibility that dust will stick to the shaft 18 and the bush 16e without disturbing the shaft 18, and the rotation operation of the shaft 18 will be hindered.

Thus, according to this embodiment, the side plate of the casing 11 is
11a, 11b, top plate 11c, and bottom plate 11d are spot-welded to form a rectangular tube shape, so deformation due to thermal strain during processing is eliminated, and rattling of the rotation of shaft 18 can be prevented, and vibration occurs. There is an advantage that the generation of unpleasant noise can be suppressed.

Further, since the shaft 18 is made of stainless steel, it can be expected to have an anticorrosive effect, and the shaft 18 is supported by the bushes 16e made of Teflon in the inner bearing member 16 that supports both ends of the shaft 18, so that It has excellent wear resistance, corrosion resistance and durability, no overhaul or parts replacement is required, and O-rings 16f, 17b
Since the outer peripheral surface of the shaft 15 is kept airtight, dust can be prevented from entering, oiling is not required, and maintainability is excellent.

As a result, they are improved in reliability and reliability, and in terms of human life protection, they are excellent for disaster prevention.

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

For example, as shown in FIG. 8, the outer bearing member 17 is formed into a cylindrical cap nut having a bottom, has a bottom portion 17c, and has an internal threaded hole 17d engraved therein. It may be omitted.

In the case of FIG. 8, the inner bearing member 1 is formed by the bottom portion 17c.
Since the space between 6 and 6 is sealed, the shaft 1 in the inner bearing member 17
It is possible to prevent dust from entering the housing 8, and the O-ring 17b is not required, which enables cost reduction.

Further, as shown in FIG. 9, the cylindrical portion 16 of the inner bearing member 16 is
It is desirable to form a slit groove 16g at the end of b. With such a configuration, when the bush 16e fitted in the press-fitted 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 disaster prevention has been described, but the present invention can be applied 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 temperature fuse 9, the shaft 18 is automatically rotated appropriately according to the temperature detecting means such as a thermometer and a thermostat, and the blades 19 are rotated by a predetermined angle in the casing 11. May be.

Needless to say, the shaft 18 can be rotated either manually or electrically, regardless of whether the tamper 5 is used for disaster prevention or 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, does not enter dust, and does not require maintenance such as parts replacement, overhaul, and lubrication. It is possible to provide a damper with improved reliability.

Further, according to the second aspect of the invention, the outer bearing member is of a penetrating type, and the O-ring is provided therein. Therefore, in addition to the O-ring of the inner bearing member, the O-ring of the outer bearing member is also used. It is possible to provide a damper that can maintain the airtightness of the shaft, can further prevent dust from entering, can prevent abrasion between the bush and the shaft, and can further improve reliability.

Further, according to the invention described in claim 3, since the outer bearing member and the bottomed tubular cap nut are used, and the cap nut and the inner bearing member are screwed together, an effect of preventing invasion into the shaft is obtained. In addition, the O-ring can be omitted, and a damper that can expect a cost reduction effect can be provided.

[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. FIG. 8 is a plan view of an inner bearing member used, and FIG. 8 is a sectional view of an outer bearing member used in another embodiment of the damper according to the present invention.
FIG. 10 is a perspective view showing another embodiment of the inner bearing member applied to the present invention, FIG. 10 is a sectional view showing a schematic structure of a duct to which a conventional damper is attached, and FIG. 11 is a conventional damper. FIG. 12 is a perspective view of a casing used for the above, FIG. 12 is a perspective view showing the shape of a mounting portion used for a conventional damper, and FIG.
FIG. 14 is a front view showing a partially broken view of the relationship between the conventional damper, push and side plate, and FIG. 14 is a cross-sectional view showing an example of the drive lock means used for the smokeproof damper. 6 ... Drive lock means, 11 ... Casing, 11a, 11b ... Side plate, 11c ... Top plate, 11d ... Bottom plate, 11e, 11f ... Joint part, 12 ... Duct, 13, 14, 15 ... Flange, 16 …… Inner bearing member, 16f, 17d …… O-ring, 16e …… Bush, 16g …… Slit slot, 17 …… Outer bearing member, 18 …… Shaft, 19 …… Vane, 20 …… Set Lever, 21 ... Engagement piece, 22 ... Jig.

Claims (4)

[Claims] 1. A rectangular tube-shaped casing provided in a predetermined location of a duct for flowing a fluid in the fluid flow direction, and holes formed opposite to each other at predetermined locations of both side plates of the casing from inside respectively. By fitting a pair of inner bearing members fitted with bushes and O-rings having wear resistance and corrosion resistance on the inner peripheral surface, and by screwing the inner bearing members from the outside of the side plates, respectively. A pair of outer bearing members for fixing the inner bearing member to the side plates, and a bush rotatably supported by the bushes of the pair of inner bearing members to rotate the blades in the casing according to a rotation angle. A damper comprising a shaft capable of changing a flow rate of a fluid. 2. The outer bearing member is provided with a through hole having a size that allows a shutter to be loosely fitted therein, and has an O-ring on an inner peripheral surface thereof that is in close contact with an outer peripheral surface of the shaft. Damper. 3. The damper according to claim 1, wherein the outer bearing member has a cylindrical shape with a bottom and is screwed to the inner bearing member by a cap nut through which the shaft does not penetrate. 4. A slit groove is formed in an end portion of the inner bearing member on the side where the bush is fitted, the slit groove allowing insertion of a jig for pulling out the bush.
The described damper.