JPH07104032B2 - Flexible duct for air conditioning equipped with air volume adjustment mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning duct,
More specifically, the present invention relates to an air-conditioning flexible duct having an air volume adjusting mechanism inside.

[0002]

2. Description of the Related Art In air-conditioning equipment, there are many structures in which cold and warm air in a main duct is branched via a flexible duct to be introduced into a silencing box that also serves as a plenum, and then blown out from a blowing device.

This will be described with reference to FIG. 4. The main duct 1 and the muffler box 2 also serving as a plenum are branched and connected by a flexible duct 3, and a blowing device 4 is connected downstream of the muffler box 2. ing. A damper 5 is provided near the communication opening of the muffling box 2 to the blowing device 4. The damper 5 controls the amount of air blown by opening and closing the damper 5, and is necessary to secure the designed air volume and eliminate the generation of wind noise in the air blower 4. According to the conventionally known air-conditioning equipment shown in FIG. 4, noise is generated by the damper 5, which is transmitted directly from the blowing device 4 to the room, which is not preferable.

Therefore, as shown in FIG. 5, there is also known a structure in which a damper 5a is arranged at the connecting portion of the sound deadening box 2a with the flexible duct 3a to prevent noise from being directly transmitted to the room. Furthermore, flexible
Install a joint pipe duct between the sibble duct and the blowing device.
Application for a structure with a damper inside the joint pipe duct
Previously known. (See Japanese Utility Model Laid-Open No. 63-110847)
Teru)

[0005]

However, the conventionally known air conditioning equipment shown in FIG. 5 has the following problems. A sound absorbing material 6a is attached to the inner surface of the sound deadening box 2a for absorbing sound, but the inner surface area of the sound deadening box 2a is large.
The sound absorbing material 6a must be attached only for the large area of
Yes. Therefore, the cost of the muffling box 2a increases. In particular, in the case where the damper 5a is installed in the sound deadening box 2a, noise due to the damper 5a is absorbed, so that the sound deadening box 2a needs to have a higher sound absorbing property, and the sound absorbing material 6a is thickened accordingly. Since it must be done, the cost becomes higher.

[0006] Normally, when placed near the blowoff device damper, reducing the room noise level due to the damper is difficult, the damper is preferably placed at a position away from the blowing device. However, there is a limit to the noise reduction in the case where the damper is built in the silencer box, and it is difficult to reduce the indoor noise. Such drawback is the actual opening
Similarly, the structure described in Japanese Patent Laid-Open No. 63-110847 does not occur.
It is something. Therefore, an object of the present invention is to provide a low-cost air conditioning facility that can reduce indoor noise with a simple structure.

[0007]

The features of the present invention are as follows. Using glass wool as a wall material,
While maintaining heat insulation and sound absorption, it branches from the flexible main duct and connects with the plenum box
In the air-conditioning duct, an air-conditioning mechanism is provided inside the air-conditioning duct, and further, an operating device for opening and closing the air-conditioning mechanism and an operated portion of the air-conditioning mechanism are provided inside the air-conditioning mechanism. It is characterized in that it is operably connected through.

[0008]

Since the air volume adjusting mechanism is provided inside the air-conditioning flexible duct, the noise generated by the air volume adjusting mechanism is absorbed by the flexible duct, and as a result, the level of the noise transmitted to the room is reduced.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention. Figure 2
2 is an enlarged cross-sectional view of the flexible duct portion of FIG. 1, and FIG. 3 is a front view showing details of the air volume adjusting mechanism of FIG.

Referring to FIGS. 1 to 3, the main duct 11
A flexible duct 13 is provided between the main duct 11 and the plenum box 12. The flexible duct 13 is covered with a synthetic resin film 13a of aluminum vapor deposition on the outside and a spiral wire 13b with a mesh on the inside.
And the glass wool 13c is provided in the middle thereof. A blowing device 14 is provided on the downstream side of the plenum box 12. An air volume adjusting mechanism 15 and an operating device 16 are provided inside the flexible duct 13. In this embodiment, the air volume adjusting mechanism 15 is installed on the upstream side of the flexible duct 13. The air volume adjusting mechanism 15 is provided in the cylindrical body 15a installed inscribed in the flexible duct 13, a shutter 15b made of a substantially circular plate rotatably arranged inside the cylindrical body 15a, and the shutter 15b. Rotating shaft 15
c and a bearing portion 15d that is fixed to the flexible duct 13 and supports the rotating shaft 15c. or,
The operating device 16 includes a tubular body 16a installed inside the flexible duct 13, an operating device 16b installed inside the tubular body 16a, and a rotary shaft 15c of the shutter 15b extending from the operating device 16b. Rotating wire 16c
It consists of The plenum box 12 is for temporarily retaining the cool and warm air and blowing it out evenly from the blowing port of the blowing device 14, and in this embodiment, no sound absorbing material is provided.

The operation of the present invention configured as described above will be described below. Cool / warm air branches from the main duct 11.
Then , the air is introduced into the flexible duct 13, the air volume is adjusted by the air volume adjusting mechanism 15, and the air is introduced into the plenum box 12. The cold / warm air having once accumulated in the plenum box 12 and having the reduced velocity component is blown out from the blowing device 14 into the room. The noise generated by the air flow rate adjusting mechanism 15 is absorbed by the flexible duct 13, so that the noise level transmitted to the room is reduced. The air volume adjusting mechanism 15 is opened and closed by a driving means (not shown)
b is rotated, and the air volume adjustment mechanism 1 is operated by the wire 16c
The rotating shaft 15b, which is the operated portion of No. 5, is rotated, thereby opening and closing the shutter 15b. According to the above-described embodiment, since the noise generated by the air volume adjusting mechanism 15 is absorbed by the flexible duct 13, it is not necessary to provide a muffling material on the plenum box 12, and the cost is reduced accordingly.

The structure described above is one embodiment of the present invention, and the present invention is not limited to the above embodiments. For example, the operating device may be placed outside the flexible duct. In addition, the air volume adjustment mechanism is flexible
The installation position inside the duct is not particularly limited, but a structure in which the air volume adjusting mechanism is arranged at the uppermost stream of the flexible duct is a more preferable embodiment from the viewpoint of increasing the sound absorbing effect. Further, the shutter structure of the air volume adjusting mechanism includes, in addition to the illustrated rotary shutter, a shutter of a sliding door type, a shutter of a diaphragm mechanism of a photographer, and a structure in which a plurality of rotary shutters are openably and closably provided. In addition, the present invention does not exclude a structure in which a silencing material is attached to the plenum box to provide the function of the silencing box. Since many flexible ducts having both a sound absorbing effect and a heat insulating effect have been proposed and are well known, detailed description thereof will be omitted.

[0013]

The effects of the present invention having the above-described structure are as follows. Since the flexible duct incorporates the air volume adjusting mechanism, the flexible duct itself absorbs the noise generated by the air volume adjusting mechanism, and the sound absorption of the plenum box is unnecessary, and the cost is reduced accordingly. According to the structure in which the operation device of the air volume adjusting mechanism is provided, the air volume adjusting operation becomes simple. If the air flow rate adjusting mechanism is provided closer to the upstream side of the flexible duct, the noise generated by the air flow rate adjusting mechanism can be absorbed better.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view of the flexible duct of FIG.

FIG. 3 is a front view of an air volume adjusting mechanism used in the present invention.

FIG. 4 is a schematic cross-sectional view for explaining a conventionally known air volume adjusting mechanism device.

FIG. 5 is a schematic cross-sectional view for explaining another conventionally known air volume adjusting mechanism device.

[Explanation of symbols]

 11: Main duct 12: Plenum box 13: Flexible duct 13a: Synthetic resin film 13b: Spiral wire with mesh 13c: Glass wool 14: Blowing device 15: Air volume adjusting mechanism 15a: Cylindrical body 15b: Shutter 15c: Rotating shaft 16: Operation apparatus

Claims (3)

[Claims] Claims: 1. In an air-conditioning duct that uses glass wool as a wall material and is heat-insulating and sound-absorbing, and at the same time is flexible and branches from a main duct and is connected to a plenum box , An air-conditioning flexible duct having an air volume adjusting mechanism, characterized in that an air volume adjusting mechanism is provided inside the air conditioning duct. 2. The air volume control according to claim 1, wherein an operating device for opening and closing the air volume control mechanism and an operated portion of the air volume control mechanism are operably connected through an inside of the air conditioning duct. Flexible duct for air conditioning equipped with mechanism. 3. An air volume adjusting mechanism is provided upstream of the air conditioning duct .
A flexible duct for air conditioning equipped with the air volume adjusting mechanism described.