JP2814382B2 - Ventilation duct - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a ventilation duct.

[Conventional technology]

In general, in buildings such as multi-family dwellings and small office buildings, the end of the ventilation duct is often opened to the outer wall surface. In this case, conventionally, as shown in FIG. 5, a bend cap d with an insect net c that covers the open end of the ventilation duct b is installed on the outer wall a to prevent rainwater and insects from entering.

 Therefore, there were the following disadvantages.

In other words, dust or the like adheres to the insect-controlling net c over a long period of use and causes clogging, or the insect-controlling net c is broken, and the insect-controlling net c is broken.
If it becomes necessary to clean or replace a new one, the above-mentioned conventional example requires an outdoor operation. Since it is difficult to reach, a high scaffold is required, and the work is dangerous at high places, it is extremely difficult to clean and replace the insect repellent net c.

[Problems to be solved by the invention]

As a solution to such a conventional drawback, it is conceivable to install an insect net in the middle of the ventilation duct so that the insect net can be cleaned and replaced by work from the indoor side. In this case, the following new problem is derived.

Due to the vibration of the electric motor over a long period of time, the duct may be deformed near the insect repellent net (the weakest part of the duct) or the insect repellent net may fall off due to loosening of the mounting screw.

It is difficult to remove dead bodies such as mosquitoes and flies and garbage accumulated in the duct between the bend cap and the insect net.

Ducts are generally made and fixed of vinyl chloride pipes or other hard materials, so that a layman cannot easily replace the insect screen.

An object of the present invention is to provide a ventilation duct that can solve these problems.

[Means for solving the problem]

The technical measures taken by the present invention to achieve the above object are as follows. That is, the feature of the present invention is to install a bend cap on the outer wall of the building where the insect repellent net at the opening end of the ventilation duct is not provided, and to form a part of the ventilation duct located on the indoor side with a stretchable bellows-like duct. The peripheral edge of the insect repellent net is sandwiched between a connecting flange formed at one end of the bellows-shaped duct and a flange of a duct joint provided opposite thereto, and a bolt penetrating these and screwed thereto. The peripheral edge portion of the insect repellent net is fastened and fixed by the two flange portions by a wing nut or a one-touch fixing metal fitting that engages the both flange portions, and an inspection port is formed on a ceiling surface below the insect repellent net. .

[Action]

According to the above configuration, the insect net can be cleaned and replaced by work from the indoor side.

In addition, since a part of the ventilation duct is formed of a bellows-like duct that can expand and contract, it can absorb the vibration caused by the electric motor of the ventilation fan, deform the duct near the insect repellent net due to the vibration, and loosen the fixing means of the insect repellent net. Can be prevented.

In addition, the bellows-like duct is shortened by simple work that anyone can do, such as removing the wing nut or disengaging the one-touch fixing bracket from both flanges,
Since the insect net is removed, it is easy to replace the insect net, and at this time, a wide gap can be formed between both flanges by shortening the bellows-like duct, so the duct between the bend cap and the insect net can be removed. It is easy to remove dead bodies such as mosquitoes and flies and garbage that have accumulated in the interior.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of the present invention. In the figure, 1 is an outer wall of a building such as an apartment house, and 2 is a ceiling.
Reference numeral 3 denotes a ventilation duct piped behind the ceiling, one end of which is open to the outer wall 1, and the other end of which is connected to the room through a ventilation fan (not shown). Reference numeral 4 denotes a bend cap at the opening end of the ventilation duct provided on the outer wall 1, and the bend cap 4 does not have an insect-proof net that causes clogging. In the middle of the ventilation duct 3 located on the indoor side, an insect repellent net 5 is detachably mounted at a position as close to the outer wall 1 as possible, and a door 6 is provided on a ceiling surface below the insect repellent net 5.
Is formed.

As a structure for detachably attaching the insect repellent net 5 to the middle of the ventilation duct 3, various structures can be adopted. In this embodiment, as shown in FIG. A connection flange 8 formed at one end of the bellows-shaped duct 3A.
And a flange portion of the duct joint 9 provided facing the same.
9a, the peripheral edge of the insect repellent net 5 is sandwiched, and wing nuts 11 are screwed into fixing bolts 10 penetrating therethrough to fasten and fix the peripheral edge of the insect repellent net 5. In the figure, reference numeral 12 denotes a mounting band for the bellows-like duct 3A, and reference numeral 9b denotes a cylindrical portion of the duct joint 9, which is closely fitted to the ventilation duct 3.

According to this embodiment, the worker on the stepladder (not shown) inserts his arm through the inspection port 7, removes the wing nuts 11,... And shrinks the bellows-like duct 3A, thereby removing and replacing the insect repellent net 5. It can be performed.

FIG. 4 shows another embodiment of the present invention. This embodiment is characterized in that, instead of the above-described fixing means using the bolts 10 and the wing nuts 11, a one-touch fixing bracket 13 having a known structure that engages with the flange portions 8, 9a is used. Other configurations are the same as the previous embodiment.

〔The invention's effect〕

Since the present invention has the above-described configuration, there is an effect that cleaning and replacement of the insect repellent net can be easily and safely performed by work from the indoor side.

In particular, according to the present invention, since a part of the ventilation duct is formed of an elastic bellows-shaped duct, the vibration caused by the electric motor of the ventilation fan can be absorbed, and the deformation of the duct near the insect net due to the vibration can be reduced. Loosening of the fixing means of the insect repellent net can be prevented.

In addition, the bellows-like duct is shortened by simple work that anyone can do, such as removing the wing nut or disengaging the one-touch fixing bracket from both flanges,
Because the insect net is removed, it is easy to replace the insect net, and at this time, a wide gap can be formed between both flanges by shortening the bellows-like duct, so the duct between the bend cap and the insect net can be removed. It is easy to remove mosquitoes, dead carcasses and garbage that have accumulated in the interior.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a schematic side view, FIG. 2 is a perspective view, and FIG. 3 is an exploded sectional view of a main part. FIG. 4 is an exploded perspective view of a main part showing another embodiment of the present invention. FIG. 5 is an explanatory view of a conventional example. 1 ... outer wall, 2 ... ceiling, 3 ... ventilation duct, 4 ... bend cap, 5 ... insect repellent net, 7 ... inspection port.

Claims (1)

(57) [Claims] 1. A bend cap having no insect repellent net at the opening end of a ventilation duct is provided on an outer wall of a building, and a part of the ventilation duct located on the indoor side is formed of a stretchable bellows-like duct. Between the connecting flange formed at one end of the tubular duct and the flange of the duct joint provided opposite to the connecting flange, and a bolt penetrating therethrough and a wing nut screwed therewith Alternatively, the peripheral edge of the insect repellent net is fastened and fixed by the two flanges by a one-touch fixing bracket that engages with the both flanges, and an inspection port is formed on a ceiling surface below the insect repellent net. Ventilation ducts.