JPS6026235A - Outdoor hood - Google Patents

Abstract

PURPOSE:To prevent both intake and discharge sides from penetration of the open air at the stopping of a ventilation fan by providing an automatic wind pressure shutter with which a discharge air ventilation flue and an intake air ventilation flue are simultaneously opened or closed, further the area of the discharge side of the shutter is enlarged. CONSTITUTION:At the operation of a ventilation fan, the same turning torque is applied to both intake and discharge sides of a shutter 7 in the same rotating direction, consequently, a shutter 10 is kept under open condition. On the other hand, at the stopping of the ventilation fan, though the shutter 10 is kept under closed condition due to a dead weight 11 at the intake side, when the open air is introduced from gallerys 9a, 9b, turning torque reverse to each other is respectively applied to the intake and discharge sides. At this time, the larger turning torque is applied to the shutter 10 due to the larger area of the discharge side than the intake side of the shutter 10, accordingly, the shutter 10 is still kept under closed condition, thereby, the penetration of the open air can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an outdoor hood attached to a ventilation fan.

Conventional configurations and their problems In recent years, as buildings have become more airtight, the demand for ventilation fans for use in areas other than kitchens has been increasing, and a wide variety of ventilation fans have been increasing in response.

As a result, many types of outdoor hoods to be attached to these ventilation fans are required.

The conventional outdoor hood as described above will be described below with reference to the drawings.

FIG. 1 shows a perspective view of a conventional outdoor hood.

In FIG. 1, 1 is a partition plate 8 that partitions the top plate 2, the front plate 3, the side plates 4, the bottom plate 6, the supply air ventilation path 6, and the air ventilation path 7.
The outdoor foot body has a 9a and 9b are gears, and 10 is an automatic wind pressure shutter provided in the exhaust air passage 7. When the ventilation fan is in operation, the outdoor air is drawn in by the ventilation fan as shown in A - + A'.
Air enters the outdoor hood main body 1 from d, passes through an air supply ventilation path 6, and is supplied indoors by a ventilation fan. On the other hand, the indoor air passes through the ventilation path 7, the gallery IJ 9b, and is exhausted outdoors.

In the outdoor hood configured as above, when the outside wind enters the outdoor hood main body 1 when the ventilation fan is stopped,
The inside of the shutter can prevent outside air from entering the exhaust ventilation path T side. However, since the direction in which outside air enters and the suction direction of the ventilation fan are the same on the side of the air supply air passage 4, an automatic wind pressure shutter cannot be provided, so the outside wind intrudes.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides an outdoor hood that simultaneously opens and closes the exhaust air passage and the supply air passage to block the intrusion of outside air.

Structure of the Invention The present invention provides an automatic wind pressure system that can open and close the exhaust ventilation passage and the supply air ventilation passage at the same time inside the outdoor hood main body, and has a larger area than either the exhaust ventilation passage side or the supply air ventilation passage side. When the operation of the ventilation fan is stopped, the exhaust ventilation passage and the supply air passage are simultaneously blocked from intrusion of outside air.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows a perspective view of an outdoor hood according to an embodiment of the present invention. The same numbers as those in FIG. 1 indicate the same parts, and the explanation will be omitted and only the different points will be explained. That is, the difference from the conventional example shown in FIG. 1 is that the exhaust ventilation passage 7
A shutter 10 consisting of a shutter 10a and a shutter 10b with a weight 11 attached to the air supply side Nyanota 10a is rotatably installed in the middle of the partition plate 8, so that the partition plate 8 can be moved up and down. It is divided into two parts.

In the outdoor hood configured as described above, when the ventilation fan is in operation, the outdoor air is reduced to C-
> As shown in C', enter the outdoor hood main body 1 from the gallery IJ g 6 and enter the shack 1 on the air supply side of the shutter 10.
Air is supplied into the room by a ventilation fan through the air supply ventilation ducts with an opening of 0 a. On the other hand, the indoor air is sucked into the ventilation fan, enters the outdoor hood main body 1 as shown in D-)D', passes through the exhaust air passage 7, opens the shack 10b on the exhaust side of the shutter 10, and discharges the gallery 1J9b. It passes through and is exhausted outdoors.

In the outdoor hood configured as described above, when the ventilation fan is operated, the shutter 10 remains open because force is applied to the shutter in the same rotational direction for both air supply and exhaust. On the other hand, when the ventilation fan is stopped, it is maintained in a closed state by the weight 11 on the air supply side, but the outside air is
When entering from a or 9b, opposite forces act on the air supply side and the exhaust side, but since the area of the shutter 10 on the exhaust side is larger than that on the air supply side, the shutter 10 on the exhaust side The force applied to the shutter is larger, and the shutter
remains closed and no outside air enters.

Effects of the Invention As described above, according to this embodiment, by providing an automatic wind pressure shutter that can open and close the exhaust ventilation passage and the supply air passage at the same time and has a large area on the exhaust side, when the ventilation fan is stopped, the air supply side and It is possible to prevent outside air from entering on both the exhaust side, and this has a significant practical effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional outdoor hood, and FIG. 2 is a perspective view of an outdoor hood according to an embodiment of the present invention. 1...Outdoor hood body, 2...Top plate,
3...Front plate, 4...Both side plates, 6...
...Air supply ventilation duct, 7...Exhaust ventilation duct, 8...
Partition plate, 10... Shack, 11... Weight.

Claims (3)

[Claims] (1) An outdoor hood body consisting of a top plate, a front plate, side plates, and a bottom surface through which air intake and exhaust air pass, and a partition plate provided at the center of the outdoor hood body to vertically partition an exhaust ventilation path and an air supply ventilation path; The outdoor hood is provided with an automatic wind pressure shutter that is provided in the outdoor hood main body and can open and close the exhaust ventilation path and the supply air ventilation path simultaneously. (2) The outdoor hood according to claim 1, wherein the automatic wind pressure shutter has a larger area than either the exhaust side or the air supply side. (3) The outdoor hood according to claim 1, wherein the wind pressure automatic shutter is provided with a weight on the air supply side.