JP2569870Y2 - Pressure receiving base plate for air damper - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to audio equipment, image equipment,
The present invention relates to a base plate for increasing the damping force of a damping damper for damping vibration of information equipment, various precision instruments, and the like.

[0002]

2. Description of the Related Art As shown in FIG.
An orifice 12 is provided above a hollow body 11 made of an elastic material such as rubber.
When compressed, the air in the hollow body is discharged from the orifice and absorbed, and the air enters and exits the orifice to obtain air resistance to attenuate vibration.

[0003]

In a conventional air damper, when pressure is applied, the pressure receiving surface 14 at the bottom is small, and the body swells as shown by a dotted line in FIG. This phenomenon becomes remarkable when the pressure receiving surface is extremely small. When the pressure receiving surface is received by the convex portion 15 as shown in FIG. 5, the pressure receiving surface is depressed in the air damper, and the bulge is increased as shown by a dotted line,
The air inside the damper becomes hard to pass through the orifice 12,
Sufficient air resistance cannot be obtained, and the damper itself bounces, reducing the vibration damping effect and increasing the amplitude at resonance.

[0004]

SUMMARY OF THE INVENTION The present invention provides a pressure receiving base plate having a slightly raised periphery along the bottom shape of the air damper in order to increase the pressure receiving area of the air damper. By using this pressure receiving base plate against the bottom of the air damper, the pressure receiving area of the air damper is increased, the air in and out from the orifice is improved, the air resistance is increased, the vibration damping effect is increased, and resonance occurs. The amplitude of the time was reduced.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

As shown in FIG. 1, the pressure-receiving base plate 1 has a flat portion 2 at the center and a rising portion 3 having a slightly inclined upper periphery.

In this embodiment, the center flat portion is further provided.
2, a contact surface 5 for receiving an air damper 4 (shown by a dashed line) is left, and a concave portion 6 is formed on the inside thereof. A hole 7 for venting air is formed in the center of the concave portion 6.

In use, as shown in FIG. 2, the pressure receiving base plate 1 is applied to the bottom of the air damper 4 for use.

The rising portion 3 around the pressure receiving base plate 1 rises slightly along the bottom of the air damper 4. Therefore, when pressure is applied to the air damper and its body 8 bulges to the side as shown by the dotted line, the bottom of this bulge
9 comes into contact with the rising portion 3 of the pressure receiving base plate, and the pressure receiving area of the air damper is limited from the area of the central flat portion 2 of the pressure receiving base plate 1 to the entire area including the rising portion 3 of the pressure receiving base plate. Therefore, the inflow and outflow of air from the air damper 4 are improved, the air damping effect is enhanced, and the amplitude at the time of resonance can be reduced.

Further, by providing a concave portion 6 and an air hole 7 in the central flat portion 2 of the pressure receiving base plate 1, when a pressure is applied to the air damper 4, the bottom surface of the air damper 4 swells into the concave portion 6. The air damper 4 stabilizes to escape.

[0011]

[Effects of the Invention] By using the pressure receiving base plate of the present invention, the pressure receiving area of the air damper increases, the air flow from the orifice becomes better, the air resistance increases, the air damping effect increases, and resonance occurs. The amplitude can be reduced.

FIG. 3 shows the vibration transmission characteristic curve of the case using the pressure receiving base plate of the present invention by a solid line, and the dotted line represents the vibration transmission characteristic curve when the pressure receiving base plate is not used.

In the case of using the pressure receiving base plate,
While the resonance magnification Q was 1.51 times, that of the unused one was 1.89 times, and the damping effect was good even though the pressure receiving base plate of the present invention was used.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a use state of the present invention.

FIG. 3 is a diagram showing vibration transmission characteristics.

FIG. 4 is a sectional view of an air damper.

FIG. 5 is a cross-sectional view of the air damper when the pressure receiving surface is a convex portion.

[Explanation of symbols]

 1 Pressure receiving base plate 2 Flat part 3 Start-up part 4 Air damper 6 Recess 8 Body

Claims (1)

(57) [Scope of request for utility model registration] 1. A damper receiving plate in which a lid having an orifice is provided at a hollow upper portion made of an elastic body, wherein a receiving portion in contact with a bottom peripheral edge of the damper is left, and a central portion is a concave portion. Inside, a central flat portion having a hole for venting air, and the periphery of this central flat portion are used by being applied to the bottom of the damper, which is raised along the bottom shape of the damper and is a sloped rising portion. Pressure receiving base plate for air damper.