JPH0264339A - Ventilating fan for duct - Google Patents

Abstract

PURPOSE:To prevent the generation of collision noise during closing of a shutter at a low cost without mounting a special part by a method wherein the shutter is rotatably supported to a shutter lock having a shutter contact part formed so that the shutter is prevented from making contact with the inner surface of a duct connection part. CONSTITUTION:A shutter 12 designed to prevent inflow of reverse flow air is secured to the inner part of a duct connection part 6 by means of a shutter lock 11 having a shutter contact part 10 making contact with the shutter during closing. The shutter 12 is opened and closed around the securing point by means of an air pressure. The shutter contact part 10 is formed such that when the shutter 12 makes contact therewith, the tip of the shutter 12 is prevented from contact with the inner surface of a connection part 6. During the stop of running of a ventilating fan for a duct, the shutter 12 for preventing inflow of reverse flow air is about to close under gravity, but in prior to contact of the shutter 12 with the inner surface of the duct connection part 6, the shutter makes contact with the shutter contact part 10 mounted to the shutter lock 11 and stops. Since the shutter contact part 10 is situated in the vicinity of the fulcrum of the shutter 12, the collision force of the shutter 12 is weak and collision noise is prevented from generation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a duct ventilation fan that exchanges air in a living room by connecting it to a duct that is attached to the ceiling of a living room and communicates with the outdoors.

Conventional technology In recent years, ventilation fans have been replaced with wall-mounted ventilation fans for reasons such as aesthetics, noise reduction, and construction. The number of duct ventilation fans has increased.

A conventional ventilation fan for a duct of this type has a configuration as shown in FIGS. 4 and 5, for example, although no specific literature can be cited.

That is, the blower 1o1 and the suction port 102 are provided inside,
A ventilation fan main body 105 having an opening 103 on the lower indoor side and a discharge port 104 on one side, and a discharge port 1 in contact with the side surface.
04 and a conical cylindrical duct connecting portion 106 disposed to communicate with the duct connecting portion 106. In addition, a shutter 108 is built into the duct connection part 106 and is fixed by a shutter stop 107 to prevent back wind, and is opened and closed by wind pressure using a fixed point as a fulcrum.This shutter 108 is connected to the duct connection part A shutter fitting 109 was provided at the bottom so as not to contact the inner surface of the shutter 106, and a buffer plate 110 was attached to the contact portion of the shutter 10B with the shutter fitting 109. Ventilation fan body 1
A decorative spring /l/1 is inserted into the opening 103 of 05 from the indoor side.
11 was installed. The duct connection was performed by fitting the duct 112 into the duct connection portion 106 so as to communicate with the duct connection portion 106 and fixing the duct 112 with tape 113 so that there was no gap.

Problems to be Solved by the Invention In such a conventional duct ventilation fan, when the operation is stopped and the shutter 10B is closed, the buffer plate 110 collides with the shutter fitting 109 with force, causing the buffer plate 110 to be stuck. In addition, a large number of parts were required, such as a metal fitting 109 for the shutter and a buffer plate 110.

The present invention has been made in consideration of the above-mentioned conventional problems, and an object of the present invention is to provide a duct ventilation fan equipped with a duct connection part 106 that can quietly close a shutter without increasing the number of parts and at low cost. It is.

Means for solving the problem In order to solve this problem, the present invention incorporates a blower,
A ventilating fan main body having a ventilation opening on a side surface, and a conical cylindrical duct connection part provided in contact with the side surface of the ventilation fan main body, communicating with the ventilation opening, and having a shutter for preventing back wind inside, The shutter is rotatably supported by a shutter stopper having a shutter contact portion formed to contact the shutter when the shutter is closed and prevent the shutter from contacting the inner surface of the duct connection portion. It is composed of

Operation With this configuration, when the operation of the duct ventilation fan is stopped and the shutter that prevents backflow at the ventilation opening is closed, the shutter stopper's nyak contact part contacts the shutter, and the inner surface of the duct connection part contacts the shutter. Since there is no contact, there is no collision noise,
Further, since the shutter abutting portion is provided at the shutter stop, it is close to the center of rotation of the shutter, and the force with which the shutter abuts is weak, so no collision noise is generated here as well.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. In the figure, reference numeral 1 denotes a ventilation fan body, which has a blower 2 and a suction port 3 disposed therein, an opening 4 on the lower indoor side, and a discharge port 6 serving as a ventilation port on one side. This discharge port 6
A duct connecting portion 6 of a conical cylinder is abutted on the negative side surface so as to communicate with the duct connecting portion 6. A decorative panel 7 is attached to the opening 4 of the ventilation fan body 1 from the indoor side. The duct connection is performed by fitting the duct 8 into the duct connection portion 6 so as to communicate with the duct connection portion 6, and fixing the duct 8 with tape 9 so that there is no gap. These configurations are largely the same and slightly different from conventional duct ventilation fans.

The features of this embodiment are as follows. That is, a shutter 1 is installed inside the duct connection part 6 to prevent back wind.
2 is fixed by a shutter stop 11 having a shutter contact portion 10 that comes into contact when the shutter is closed, and the shutter 12 is configured to be opened and closed by wind pressure using this fixed point as a fulcrum.

Here, the shutter abutting portion 1o is formed so that when the shutter 12 abuts, the tip of the shutter 12 does not abut the inner surface of the duct connecting portion 6.

In the above configuration, when the duct ventilation fan stops operating, the shutter 12 for preventing back wind tries to close due to its own weight, but before the shutter 12 comes into contact with the inner surface of the duct connection part 6, the shutter provided on the shutter stop 11 closes. It comes into contact with the contact portion 1o and stops. And shutter contact part 1o
Since the shutter 12 is close to the fulcrum of the shutter 12, the impact force of the shutter 12 is weak and no impact sound is generated. Also,
There is no need for conventional shutter fittings or buffer plates.

In the embodiment, an example of exhaust gas is shown, but the same applies to the case of air intake, and it is only necessary to reverse the fixing direction of the shutter 12 from left to right as shown in the figure, and there will be no difference in the operation and effect.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, there is provided a shutter having a shutter abutting portion formed to abut the shutter when the shutter is closed and prevent the shutter from abutting the inner surface of the duct connection portion. By providing the shutter rotatably supported on the stop in the duct connection part, it is possible to prevent the occurrence of collision noise when the shutter is closed at low cost without providing any special parts.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a duct ventilation fan according to an embodiment of the present invention;
Figure 2 is a cross-sectional view of the duct connection part of the same duct ventilation fan, Figure 3 is an enlarged view of the shutter support part of the duct connection part, and Figure 4 is an enlarged view of the shutter support part of the duct connection part.
The figure is a sectional view of a conventional duct ventilation fan, and FIG. 6 is a sectional view of a duct connection part of the duct ventilation fan. 1... Ventilation fan body, 2... Blower, 6
...Discharge port, 6...Duct connection, 1
0...L per shutter, 11...Shutter stopped, 12...Shutter. Name of agent: Patent attorney Shigetaka Awano and one other person: Ginsuke

Claims (1)

[Claims] A ventilation fan body with a built-in blower and ventilation holes on the side,
It consists of a conical cylindrical duct connection part that is provided in contact with the side surface of the ventilation fan body, communicates with the ventilation port, and has a shutter for preventing back wind inside, and the shutter comes into contact with the shutter when the shutter is closed. A ventilation fan for a duct, which is rotatably supported by a shutter stop having a shutter contact portion formed so that the shutter does not come into contact with the inner surface of the duct connection portion.