JPH0341231Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a damper that opens and closes an air conditioning duct and a smoke exhaust duct.

In conventional dampers, a stopper of the damper blade is provided protruding from the inner wall of the duct at the fully closed position of the damper blade rotatably supported in the duct, and the damper blade is pressed against the stopper to maintain airtightness. Therefore, it was necessary to use a motor that can rotate the damper blades in both forward and reverse directions. Furthermore, due to errors in manufacturing and assembly, the airtightness between the stopper and the damper blades was not sufficient, making it difficult to create a damper with high airtightness, and there were also disadvantages in that noise and vibration were generated when the damper was closed. Furthermore, since it is necessary to use a motor that can rotate in forward and reverse directions and to provide a stopper on the inner wall of the duct, there is a problem in that the cost is high. A damper was developed in 1977-120045 in which the peripheral edge of the damper blade is made thin and integrally shaped so that it has elasticity, and the elastic peripheral edge contacts the inner wall of the duct to create an airtight seal.
It is known from the publication No. However, with this damper, if the contacting outer peripheral edge is damaged, the entire damper blade must be replaced, which is not economical. Furthermore, since the rotary shaft of the damper is located on the peripheral edge side of the damper blade and close to the duct wall, the airtightness of this rotary shaft portion is poor. Furthermore, there is a description of a damper blade in which an elastic body is attached to one side of a rigid blade plate in a state that protrudes from the blade plate, but this is a structure in which it is pressed against a stopper on the inner circumferential wall of the duct, similar to the previously well-known damper blade described above. It is necessary to perform stopper pressing of the protrusions on the inner circumference of the duct, and it is necessary to use a motor that can rotate in both forward and reverse directions, resulting in high costs.Also, there are disadvantages in that it is difficult to maintain airtightness around the rotating shaft. ing. The present invention aims to provide an airtight structure for a damper of a new concept that eliminates such drawbacks and problems.

This invention is based on a damper in which a motor 3 drives a damper blade 2 rotatably supported in a duct 1 so that the stopper does not protrude from the inner circumferential surface in one direction. A rotary shaft 4 is provided, and the damper blade is removably sandwiched between two front and rear rigid blade plates A and B with a flexible membrane C made of silicone rubber or the like extending over a predetermined width from the outer periphery of the blade plate. The present invention relates to an airtight structure of a damper characterized in that the damper is constructed by In the figure, 4 is the rotation axis of the damper blade, and 5 is the blade plate A, B.
and a screw for integrally fixing the flexible membrane C, 6 is a stopper, and 7 is a bearing. The distance l indicates the protruding length of the flexible membrane C from the outer periphery of the damper blade, and the distance h indicates the step between the outer peripheries of the two blade plates A and B.

Embodiments of the present invention will be described below based on the drawings. In this embodiment, the outer dimensions of the vanes A and B are different, with the outer diameter of the vane A being larger by a distance h. Further, in this embodiment, the motor 3 is operated to rotate the damper blade 2 in one direction (counterclockwise in FIG. 1). When the tip of the damper blade 2 comes close to the inner wall of the duct 1, the flexible membrane C comes into contact with the inner wall of the duct 1, but since the length of the blade plate A and B is longer on the advancing side by h, the flexible membrane C is not flexible. The flexible membrane C easily bends in a direction opposite to the direction of movement to form a flexible membrane C.
is pressed against the inner wall of the duct 1 to maintain high airtightness. The flexible membrane C bends in one direction without being strangely pressed against the inner wall of the duct and twisted, so that the damper blade 2 rotates smoothly. Furthermore, in this embodiment, since no stopper is provided on the inner circumferential wall of the duct 1, the damper blade 2 can rotate over 360°C, and the flexible membrane C suddenly hits the stopper when it is closed, causing damage. There is no problem, and the life of the flexible membrane C is long. Furthermore, since the rotating shaft is located at the center of the damper blade 2 and there is a flexible membrane C around the entire periphery of the blade, it has excellent airtightness and sound insulation, and also does not come into contact with the stopper, greatly reducing noise and vibration. did it. FIG. 4 shows a comparison result between the conventional damper and the damper of this embodiment regarding airtightness. Further, the noise insulation performance of the damper of this example was tested and the results are shown in FIG. The white circles in Fig. 4 are the data of this example,
The black circles are data for conventional dampers. As can be seen, the amount of leakage was reduced to 1/15 of that of this example, and the noise was also reduced by 15 dB.

As described above, according to the present invention, since the flexible membrane body is sandwiched between the two rigid blades A and B, the flexibility and durability of the flexible membrane body are improved. Good airtightness can be achieved, and even if the flexible membrane is damaged, it is sandwiched and removable, so only a new flexible membrane can be replaced, making it economical as there is no need to replace the entire damper blade. It is true. Furthermore, since the rotary shaft of the damper is provided in the center of the vane, there is an effect of good airtightness. Furthermore, since there is no need to protrude a stopper from the inner periphery of the duct, not only is there less damage to the flexible membrane, but there is also less noise. Furthermore, it has high sound insulation properties,
Another advantage is that it has excellent airtightness.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the airtight structure of the damper of the present invention, Fig. 2 is a partially cutaway front view showing the damper blade, Fig. 3 is a sectional view showing the airtight structure of a conventional damper, and Fig. 4 FIG. 5 is an explanatory diagram showing the comparison results of the amount of leakage between the example and the conventional damper, and FIG. 5 is an explanatory diagram showing the results of the measurement test of the noise insulation properties of the example. 1: Duct, 2: Damper blade, 3: Motor,
A, B: vane plate, a, b: advance side vane plate part,
a′, b′: Non-progressing side blade plate portion.

Claims (1)

[Scope of utility model registration request] In a damper in which a damper blade 2 is rotatably supported in a duct 1 with no stopper protruding from the inner circumferential surface and is driven to rotate in one direction by a motor 3, a rotating shaft 4 is provided at the center of the damper blade 2. The same damper blades are placed between two front and rear rigid blade plates A and B with a flexible membrane C made of silicone rubber or the like.
An airtight structure for a damper, characterized in that the air-tight structure of the damper is constructed by removably sandwiching the blades so that they extend over a predetermined width from the outer periphery of the blade plate.