JPH0744896Y2 - Flexible duct structure with adjustable air volume - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a flexible duct for blowing air, which is configured to have a spiral skeleton and can freely bend the blowing direction, and changes the cross-sectional area of the duct. The present invention relates to a structure for adjusting the air volume.

[Conventional technology]

The amount of air sent from the blower can be adjusted by installing a damper at its outlet, but there is a drawback that noise is generated by wind noise and vibration noise. Conventionally, when the duct is flexible, the duct itself is A method has been proposed in which the air volume is adjusted by tightening from the outer periphery to change its cross-sectional area. A structure of such a flexible duct is disclosed in Japanese Utility Model Publication No. 59-34240.
That is, this invention cuts off a part of the duct for blowing air,
A rubber tube is connected between them, and the outer circumference of the rubber tube is tightened inward by bundling it with a fastener such as a ring. Then, the cross-sectional area of the rubber tube is changed by adjusting the strength of the tightening to adjust the air volume.

[Problems to be solved by the device]

However, in the above-described conventional duct structure, there is a problem that a part of the duct must be connected by a rubber tube, which requires time and effort to dispose the duct. In addition, in order to reduce the cross-sectional area of the rubber tube, it is necessary to separately prepare a fastening tool that surrounds the outer circumference of the rubber tube, which causes a problem that the number of parts increases and the fastening work becomes complicated. It was

Therefore, the present invention was made in view of such problems, and the purpose of the present invention is not to make the duct itself to have a special structure, and to specially provide a fastening tool for surrounding the outer circumference of the rubber pipe. It is to provide a duct structure that does not need to be prepared and that can adjust the air flow rate with a simple structure.

[Means for Solving the Problems]

This invention relates to a flexible duct for blowing air which is provided with a flexible spiral skeleton and cuts the skeleton at an arbitrary point to separate it into a first skeleton and a second skeleton. As a flexible duct structure in which cut ends of the first and second frames are overlapped to form an overlapped part of the frame and the cut ends are fixed by a locking tool so that the length of the overlapped part can be varied. The above problems are solved.

Further, a flexible duct structure in which the extendable and retractable auxiliary metal fitting is bridged in the flexible duct in the diametrical direction between the frames can also be used.

[Action]

In a flexible duct structure that cuts the frame of the flexible duct at an arbitrary point, the cut ends of the first frame and the second frame, which are cut and separated, are overlapped to form an overlapping part, and these ends are locked by a fastener. Stop the part. At this time, the flexible duct is twisted at that portion, and the cross section is deformed by changing the fixing position of the locking tool. Therefore, by arbitrarily setting the length of the overlapping portion of the cut end portion, the cross-sectional area of the flexible duct in that portion is changed, and thus the air volume passing through this portion is adjusted.

Further, according to such a device, it is not necessary to separately prepare a special fastening tool in order to change the cross-sectional area of the flexible duct by utilizing the framework of the flexible duct.

Inside the flexible duct, in a flexible duct structure in which a stretchable auxiliary metal fitting is spanned between the diametrical frameworks, by adjusting the length of the auxiliary metal fitting, the both ends are locked and face each other, Change the distance between skeletons. Then, the cross section is deformed into an elliptical shape, and the length of the minor axis is variously changed to increase or decrease the cross sectional area, thereby adjusting the air volume passing through this portion.

According to this invention, the flexible duct itself does not need to have a special structure, and a flexible duct structure capable of adjusting the air volume can be simply configured by providing an extendable auxiliary metal fitting to be hung between the frames. You can

〔Example〕

A first embodiment of the present invention will be described with reference to FIGS. 1 is a side view of the flexible duct structure of this embodiment, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a front sectional view of a locking tool used in the structure. Shown respectively.

As shown in FIG. 1, the flexible duct 1 is connected to an air blower (not shown) to blow air, and a ceiling 6 is provided.
It is attached in a state in which it is bent at a substantially right angle between the outlet 5 and the outlet 5 for sending the wind into the room, and they are connected to each other. This flexible duct 1 has flexibility, for example, a framework 2 formed by spirally winding an iron wire,
A mold material 3 such as cloth or vinyl is attached to the outer circumference and the inner circumference to form a cylindrical shape, and the flexible duct 1 can be freely bent in the middle part without leaking air inside due to its spiral structure. It has a structure that allows

The skeleton 2 of the flexible duct 1 is cut in the middle thereof and divided into a first skeleton 2A on the blower tube 4 side and a second skeleton 2B on the blowout port 5 side. Then, as shown in FIG. 2, the cut end portions 2a, 2a of the skeletons 2A, 2B are drawn out to the outside of the upholstery material 3 and overlapped to form an overlapping portion D, and both end portions 2a, 2a are formed. Is detachably fixed with a locking tool 7 which is crimped with a butterfly screw.

As shown in FIG. 3, the lock 7 includes a box-shaped main body 7a whose interior is divided into two chambers by a partition 7d, pressing plates 7b and 7b arranged in the respective chambers, and these fastening plates. 7b, 7b and thumbscrews 7c, 7c for pressing the partitions 7b in the direction of the partition 7d, respectively. Then, the cutting ends 2a, 2a of the first and second frames 2A, 2B are inserted between the pressing plates 7b, 7b and the partition 7d, and by pressing the thumbscrews 7b, 7b, the pressing is performed. It has a structure in which the plates 7b, 7b and the partition 7d are pressed against each other to press them together.

Next, a method of using this embodiment will be described.

Frame 2A, 2 of flexible duct 1 cut in the middle
In B, the cut end portions 2a, 2a are pulled out to the outside of the upholstery material 3 to be exposed, and the two are overlapped to form an overlapping portion D.
Then, these end portions 2a, 2a pass through the inside of the locking tool 7 from opposite sides, and after fixing the locking tool 7 by tightening the thumbscrew 7c on either one of the end portions 2a, the other end portion 2a Is adjusted to adjust the length of the overlapping portion D, and similarly fixed by the thumbscrew 7c to fix the cut ends 2a, 2a together.

At this time, when the cut ends 2a, 2a of the first and second frames 2A, 2B are pulled to form the overlapping portion D, the flexible duct 1 is twisted and the cross section is deformed, as shown in FIG.
That is, if the length of the overlapping portion D is made longer, the first and second skeletons 2A, 2B come closer to each other and the cross-sectional area becomes smaller. Conversely, if this length is shortened, the skeletons 2A, 2B are separated from each other. The cross-sectional area becomes large. Therefore, in this embodiment, by adjusting the length of the overlapping portion D, the cross-sectional area of the flexible duct can be changed, and thus the air flow rate can be easily adjusted.

Further, as described above, according to this embodiment, it is not necessary to prepare a special fastening tool in order to change the cross-sectional area of the flexible duct 1 by using the skeleton 2. It is possible to configure a flexible duct structure capable of

A second embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 is a side sectional view of the flexible duct structure of this embodiment, and FIG. 5 is a sectional view taken along the line VV of FIG.

As shown in these figures, the auxiliary metal fitting 9 comprises two arms 9b and 9b extending in opposite directions and having their rear ends overlapped with each other, and the rear ends of both arms 9b and 9b are compressed by a butterfly screw. It is constituted by a locking tool 9a for stopping, and the entire auxiliary metal fitting 9 has a structure capable of expanding and contracting by adjusting the length of the overlapping portion at the rear end. And, this auxiliary metal fitting 9 has both arms 9b, 9
The hooks 9c, 9c at the tip of b are hooked on the framework 2 of the flexible duct 1 and are hung in the flexible duct 1 in the diametrical direction.

Other than that, the structure of the flexible duct 1 and the like is the same as that of the first embodiment, and the description thereof will be omitted.

Next, a method of using this embodiment will be described.

Loosen the locking tool 9a of the auxiliary fitting 9 and slide both arms 9b and 9b to adjust the entire length L of the auxiliary fitting 9. At this time,
By shortening the length L as shown in FIG. 4, the auxiliary metal fitting 9 has a framework 2 in which the tips of both arms 9b, 9b are hooked.
Are brought close to each other, and the cross section of this portion is made elliptical as shown in FIG. If the length of the circumference is constant, the area of the ellipse decreases as the length of the minor axis becomes shorter. Therefore, the length L of the auxiliary metal fitting 9 that determines the length of the minor axis is adjusted. As a result, the cross-sectional area of this portion can be changed arbitrarily, and thus the amount of air passing through this portion can be adjusted.

As described above, in the flexible duct structure of the present embodiment, the duct can be easily assembled by hooking both ends of the auxiliary metal fitting 9 on the skeleton 2 and adjusting the length L thereof without modifying the flexible duct 1 itself. The amount of air passing through can be adjusted.

Although the auxiliary metal fitting 9 of this embodiment is configured by using the butterfly screw type locking tool 9a, the structure of the auxiliary metal fitting is not limited to this, and a screw groove is formed at the rear end of the arms 9b and 9b. A structure may be employed in which the both are cut and screwed into a turnbuckle for connection.

[Effect of device]

As described above, in the flexible duct structure for cutting the skeleton of the flexible duct, a special fastening tool is not prepared for changing the cross-sectional area by using the skeleton, and the cut end of the skeleton is not used. A structure capable of adjusting the air volume can be configured by a simple work of fixing each other with a locking tool.

Further, even in the flexible duct structure in which the auxiliary metal fitting is provided in the duct, the air volume can be adjusted by a simple work of hanging the auxiliary metal fitting between the frameworks in the duct without making the flexible duct itself into a special structure. The structure can be configured.

[Brief description of drawings]

1 is a side view showing the flexible duct structure of the first embodiment, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG.
FIG. 4 is a front sectional view of the fastener, FIG. 4 is a side sectional view showing a flexible duct structure of the second embodiment, and FIG. 5 is a V- of FIG.
It is sectional drawing in the V line. 1 ... Flexible duct, 2 ... frame, 2A ... first frame, 2B ... second frame, 2a ... cut end, 7 ...
… Locking tool, 9… Auxiliary metal fitting, D… Overlapping part, L… Length of auxiliary metal fitting

Claims (2)

[Scope of utility model registration request] 1. A flexible duct for blowing air, comprising a flexible spiral skeleton, which is cut at an arbitrary point to separate it into a first skeleton and a second skeleton. The cut ends of the first and second frames are overlapped to form an overlapped part of the frame, and the cut ends are fixed by a locking tool so that the length of the overlapped part is variable. Flexible duct structure that can adjust the air flow rate. 2. A flexible duct for blowing air, comprising a flexible spiral skeleton, wherein an extendable auxiliary metal fitting is diametrically extended between the skeletons in the flexible duct. Flexible duct structure that can adjust the air flow.