JPS644363Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a smoke and fire prevention damper that closes the duct passage in order to prevent smoke and fire in an air conditioning ventilation duct. Regarding smoke and fire dampers.

In conventional smoke and fire prevention dampers, the damper blades are constantly biased in the closing direction by a spring, and the damper blade rotation locking mechanism is released by the operation of a temperature fuse or temperature sensor to apply spring force to the damper blades. It rotates and closes the duct, blocking the movement of smoke and fire. This damper blade closes not only in the event of an abnormality such as a fire, but also during periodic maintenance inspections once or twice a year, and must be intentionally closed to inspect operational performance.

However, when the damper blades close, they come into contact with each other or the duct wall, generating large shocks and vibrations. These shocks and vibrations propagate through the passages inside the duct, reverberating and resonating with the duct walls, creating louder sounds and vibrations that not only threaten people, but also stir up dust from the ducts and grills, causing dust to enter the room. It may be emitted, contaminate the room, and cause damage to indoor electrical equipment. Especially in clean rooms, precision machinery rooms, hospitals, food factories,
This has become a big problem in places where impact noise and dust are averse, such as pharmaceutical factories.

The present invention was developed in view of the above-mentioned conventional problems, and its purpose is to buffer the vibration impact when the damper blade is closed, prevent the sound of the damper blade from closing, and prevent the spread of dust into the room. An object of the present invention is to provide an improved smoke and fire prevention damper that prevents closing noise and can solve various problems caused by the occurrence of the noise.

The present invention achieves the above object by providing a shaft hole in the duct wall that forms the air flow path, and using a spring to constantly move the damper blade fixed to the rotating shaft that is pivotally supported in the shaft hole in the direction of closing the flow path. In the smoke and fire prevention damper, a shock absorber is provided near the shaft end of the rotating shaft, and the shock absorber includes an abutment piece that is connected to the rotating shaft and rotates in synchronization with the rotating shaft, and a damper blade. A plurality of springs having different lengths and constants are provided at the abutment piece position in the closed state, and when the flow path of the damper blade is closed, the abutment piece abuts the plurality of springs to prevent the damper blade, duct wall, etc. It consists of a smoke-proof and fire-proof damper that absorbs the impact of a collision with a closing noise prevention type.

Below, regarding the first embodiment of the present invention, Fig. 6,
Explaining based on FIG. 7, a shaft hole is provided in the duct wall 9 forming the air flow path, and the rotating shaft 3 is pivotally supported in this shaft hole. Further, a damper blade 1 is fixed to this rotating shaft 3. As shown in FIG. 1, for example, this damper blade 1 is constantly urged by a spring 2 in the direction of closing the flow path.

In addition, under normal conditions, the damper blade 1 opens the air flow path, and locks the biasing force of the spring 2, etc., and maintains a predetermined opening degree by a locking mechanism linked to a temperature fuse, temperature sensor, etc. (not shown). ing.

A shock absorber 5'' is provided near the shaft end of the rotary shaft 3, and the shock absorber 5'' includes an abutting piece 19 and three springs 17, 17' having different lengths and spring constants. 17″ included.

A contact piece 19 is connected to the rotating shaft 3 and rotates in synchronization with the rotation of the rotating shaft 3. That is, a substantially L-shaped lever is connected to the rotating shaft 3 and extends from the duct wall 9 to the outer wall, and the bent end of this lever forms the abutment piece 19.

On the other hand, a support plate is provided protruding from the outside of the duct wall 9, and this support plate has three length springs at the position where the abutting piece 19 comes into contact with the damper blade 1 when the damper blade 1 is in the closed state. Springs 17, 17', 17'' with different constants extend and contract in the direction of this contact piece 19.
It is fixed towards the side. As seen in FIG. 7, the spring 17 is the longest, and the lower springs 17' and 17'' are gradually shorter than this.Moreover, these springs are arranged in an arc shape in the direction of expansion and contraction. There is.

Now, when the temperature fuse blows out in the event of an abnormality such as a fire, the locking mechanism is released, and the damper blade 1 rotates due to the biasing force of the spring 2 and approaches the closed position, the abutment connected to the rotating shaft 3 Piece 19 is
First, the longest spring 17 is contacted. The rotation of the damper blade 1 is decelerated by the elastic repulsive force due to the spring constant of the spring 17. When the contact piece 19 hits the next spring 17', the elastic repulsive force of both springs 17 and 17' further causes
Finally, the contact piece 19 hits the third spring 17'', and the elastic force of the three springs causes the damper blade 1 to move very slowly and quietly, closing the air passage. .especially,
Since three springs with different lengths and constants are brought into contact with the contact piece in order, the spring repulsion force increases quadraticly, thereby causing the damper blade 1 and the duct wall 9 to This reduces the impact of collision with other objects, and extremely effectively prevents the occurrence of closing noise and the generation of dust due to the impact.

Next, a second embodiment of the closing sound prevention smoke/fire damper according to the present invention will be described based on FIGS. 8 and 9. As shown in FIG. 8, in this embodiment, a support rod is fixed parallel to the axial direction of the rotating shaft 3, and three coil springs 16, 16' having different lengths and constants are attached to this support rod. , 16'' are loosely inserted and secured to the rotating shaft 3.

Furthermore, abutting pieces 18, 18', 18'' are fixed to the rotating shaft 3 in correspondence with the arrangement positions of the coil springs, and when the damper blade is in the closed state, these abutting pieces 18, 18', 18''18',18'' come into contact with each end of the coil springs 16, 16', 16''.
6, 16', 16'' and contact pieces 18, 18', 1
8'' constitutes a shock absorber 5''. As in the first embodiment, as the rotating shaft 3 rotates, the contact pieces 18, 18', 18'' sequentially contact the coil springs 16, 16', 16'', and the spring force by the spring is curved into a quadratic curve. By increasing the damper blade 1, the damper blade 1 is quietly closed, and the generation of closing noise and impact vibration is suppressed.

The closing sound prevention type smoke and fire damper according to the present invention may have various other modified aspects.
Figures 1 to 5 illustrate such variations.

In the modified example shown in Fig. 1 and Fig. 2, the shock absorber 5 is constructed by projecting one end of the rotating shaft 3 outside the duct wall 9, fixing the rotating disk 11 to the projecting portion via a key 13, and further covering the shaft end casing 10 with high-viscosity silicon grease 12 interposed between the rotating disk 11 and the rotating disk 11. In the drawings, 1 is a damper blade, 2 is a spring that constantly biases the damper blade 1 in the direction of blocking the flow path, 14 is a spring that presses the damper blade 1 in the direction of blocking the flow path, and 15 is a spring that presses the damper blade 1 in the direction of blocking the flow path.
Reference numeral 15 denotes a spring that presses the rotating disk 11 against the shaft end casing 10.

In this modification, the high viscosity silicone grease 12 sealed and interposed between the shaft end casing 10 and the rotary disk 11 creates viscous resistance when the rotary shaft rotates, producing torque that prevents rotation, thereby causing the damper blades to This reduces the collision impact, slows down the rotation, and allows the blades to perform a gentle closing action.

Next, the modified examples shown in FIGS. 3 to 5 will be described, and the same members as those in the modified examples are given the same reference numerals and their explanations will be omitted. In this modification, an arm 4 is attached to the rotating shaft 3, a rod is further fixed to the arm 4, and the end of the rod is inserted into the cylindrical shock absorber 5' to buffer the impact force. be. Further, in the example shown in FIG. 7, a valve fixed to the tip of the rod is configured to move within the air cylinder 7, and a throttle portion 6 is provided in the exhaust path of the air exhausted when the damper blade 1 is closed. Sho 8
is the manual control lever for the damper blade.

As explained above, according to the present invention, a shock absorber is provided near the shaft end of the damper blade rotation shaft, and this shock absorber is connected to the contact piece connected to the rotation shaft, and a plurality of lengths and constants are different from each other. Since it is composed of a spring, it reliably buffers the vibration impact when the damper blade is closed, preventing the closing noise of the damper blade, and preventing the spread of dust into the room, etc. No such malfunctions will occur. Also, hospitals,
It becomes possible to maintain a good sanitary environment even in food factories, pharmaceutical factories, etc.

[Brief explanation of the drawing]

1 to 5 show modified examples of the present invention, in which FIG. 1 is a front view of a shock absorber type damper filled with high viscosity silicone grease, and FIG.
Figure 3 is a front view of the damper using a cylindrical shock absorber, Figure 4 is a schematic side view of the damper, and Figure 5 is an air cylinder with a throttle section in the exhaust path. A schematic diagram of the damper
6 to 9 show embodiments of the present invention, FIG. 6 is a main part configuration diagram of the first embodiment, FIG. 7 is a sectional view of the same side, and FIG. 8 is a second embodiment. Main part configuration diagram,
FIG. 9 is a sectional view of the same side. 1...damper blade, 2...spring, 3...
... Rotating shaft, 5, 5', 5'', 5'''... Shock absorber, 16, 16', 16'', 17, 17', 1
7″……Spring, 18, 18′, 18″, 19
...Abutting piece.

Claims (1)

[Scope of utility model registration request] A shaft hole is provided in the duct wall 9 forming the air flow path,
In a smoke and fire prevention damper in which a damper blade 1 fixed to a rotary shaft 3 pivotally supported in this shaft hole is constantly urged by a spring 2 in a direction to close a flow path, near the shaft end of the rotary shaft 3. A shock absorber 5'' or 5'' is provided on the shaft, and the shock absorber 5'' or 5'' is connected to the rotating shaft 3 and has contact pieces 19, 18, 18', 18'' that rotate in synchronization with the rotating shaft 3.
A plurality of springs 17, 17', 17'', 1 having different lengths and constants are installed at the abutment pieces 19, 18, 18', 18'' positions of the damper blade 1 in the closed state.
6, 16', 16'', the damper blade 1
When the flow path is blocked, the contact pieces 19, 18, 18',
18'' is the plurality of springs 17, 17', 1
7'', 16, 16', and 16'' to buffer the collision impact between the damper blade 1 and the duct wall 9, etc., and is a closing noise prevention type smoke and fire damper.