JPS6357707B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a shutter device that is opened using the pressure of the wind generated by a fan motor.

(b) Prior Art Conventionally, a shutter device that opens and closes using wind pressure has a shutter plate opened only by wind pressure and closed by the weight of the shutter plate. Therefore, the opening angle of the shutter plate is set so that wind pressure and own weight are balanced. Therefore, the opening angle of the shutter plate was smaller than that when the shutter plate was forcibly opened using a drawstring or the like. Further, since the shutter plate is kept in a closed state only by its own weight, the shutter plate tends to flap if there is a difference in pressure between the outside and the inside. Furthermore, in order to reduce the opening angle and opening force of the shutter plate, the shutter plate is biased in the opening direction by a spring having a force smaller than the weight of the shutter plate, but the flap when the shutter plate is closed is reduced. It easily cracked and made strange noises.

In addition, there is a pull cord type shutter device described in Japanese Utility Model Publication No. 47-25483 that allows reliable closing when closing and stable opening when opening. In the shutter device, the spring that biases the shutter plate is located above the pivot shaft of the shutter plate when it is open, and below when it is closed, so that the spring that biases the shutter plate is biased in the opening direction when it is opened, and closed when it is closed. It is biased in the direction of growth.

However, when the shutter plate is opened, the spring protrudes from the frame to the outside, which causes the spring to be exposed to wind and rain, causing rust, shortened service life, and malfunction. In addition, there is a risk that the spring may be blown away by the wind pressure in strong winds unless the spring is securely connected to the shutter plate and frame.

(c) Problems to be Solved by the Invention The present invention provides a wind pressure shutter device that can maintain a stable and reliable state of the shutter plate in each opening and closing position and can withstand long-term use.

(d) Means for Solving Problems The present invention pivots a shutter plate that opens under wind pressure to the outdoor opening of a frame that is inserted into an opening formed in a room wall, and closes the shutter plate when it is closed. The problem is solved by installing a spring between the shutter plate and the frame, which is biased in the opening direction when opened, and is always located close to one side of the frame regardless of whether the shutter plate is opened or closed. It is something to do.

(E) Function The present invention uses a single spring to assist in opening the shutter plate due to wind pressure and closing the shutter plate due to its own weight, and the spring is always located within the frame.

(F) Example The present invention will be described below based on an example shown in FIGS. 1 and 2.

Reference numeral 1 denotes a ventilation fan equipped with a wind pressure shutter device 2 of the present invention, and the ventilation fan 1 includes a cylindrical frame 3 made of sheet metal that is fitted into an opening formed in a room wall A, and support legs inside the frame 3. 4, and a blade 8 fixed to the rotating shaft 6 of the motor 5 with a spinner 7.
The wind pressure shutter device 2 is attached to the outdoor opening of the frame 3, and the front cover 10 is detachably attached to a collar 9 formed at the indoor opening of the frame 3.

The cover 10 has a wrap-shaped wind tunnel 11 that covers the circumference of the blade 8, an oil droplet guide part 12 formed at the edge of the indoor opening of the wind tunnel 11, and an oil drop guide part 12 formed at the upper half edge of the indoor opening of the wind tunnel 11. It consists of a smoke collection part 13 stretched like the brim of a hat. An oil reservoir 14 is removably attached to the lower part of the front cover 10 to collect oil droplets that adhere to the inside of the wind tunnel 11 and flow down while being guided by the guide section 12.

The wind pressure shutter device 2 includes a shutter plate 15 pivotally supported by the frame 3 and a spring 16 that biases the shutter plate 15. Projections 17 are provided on both sides of the upper part of the shutter plate 15 to protrude along the inner surface of the frame 3, and the tips of the projections 17 are pivoted to the frame 3 by a pivot shaft 18. There is. The spring 16 is attached to the upper edge of one side of the shutter plate 15.
A locking portion 19 for locking one end of the locking portion 19 is provided in a protruding manner. A protrusion 20 is formed on the inner lower surface of the frame 3, with which the lower edge of the shutter plate 15 comes into contact. A locking portion 21 for locking the other end of the spring 16 is formed on one side of the protrusion 20. The elastic force of the spring 16 is set smaller than the moment due to the shutter plate 15's own weight about the pivot shaft 18.

Next, the action will be explained. As shown in FIG. 1, when the wind pressure shutter device 2 is in the closed state, the spring 16 is stretched between the locking portions 19 and 21.
The line of action is located on the outside of the room with respect to the pivot shaft 18. Therefore, similar to the moment due to its own weight, the elastic force of the spring 16 is
5, thereby reliably holding the shutter plate 15 in the closed state. As shown in FIG. 2, when the wind pressure shutter device 2 is in the open state, the line of action of the spring 16 is on the pivot shaft 18.
It is located more indoors. Therefore, the force of the wind generated by the blades 8 acts to hold the shutter plate 15 in the open state, and the elastic force of the spring 16 also acts in the direction of opening the shutter plate 15. Shutter board 1
No. 5 is opened only by wind pressure, which opens the air more widely and improves the air blowing efficiency. When the air blowing by the blades 8 stops in the open state described above, the shutter plate 15 closes due to its own weight. The spring 16 is located within the frame 3 when the shutter plate 15 is closed, and the spring 16 is prevented from being exposed to wind and rain. Further, even when the shutter plate 15 is opened, the spring 16 is always located close to one side of the frame 3, thereby reducing the influence of wind and rain.

3 to 6 show other embodiments of the present invention. Descriptions of structural parts in this embodiment that are the same as those in the above-mentioned embodiments will be omitted and will be designated by the same reference numerals. A locking portion of the spring 16 formed on the upper edge of the shutter plate 15 is formed by a separate substantially triangular locking member 22. A gripping portion 23 is formed on one side of the locking member 22 to be attached to the upper edge of the shutter plate 15. The locking member 2
2 is attached to the shutter plate 15, the vertices 24, 24 located at both ends of one side of the substantially triangular locking member 22 are in contact with the shutter plate 15, and the other vertices 25 are It is located away from the shutter plate 15. When the shutter plate 15 is in the closed state, the spring 16 is attached to the apex 24 of the locking member 22, as shown in FIGS. 3 and 5.
It is locked to. Therefore, the line of action of the spring 16 is on the pivot shaft 18 or on the pivot shaft 18.
Since it is located closer to the outside of the room, the shutter plate 15
is held securely in the closed state. When the blade 8 rotates and a force acts on the shutter plate 15 to cause it to open, and the shutter plate 15 begins to open, the portion of the spring 16 hooked onto the locking member 22 during the opening process. is the locking member 2
2, and is locked at the other vertex 25 as shown in FIGS. 4 and 6. In this state, the line of action of the spring 16 is located on the indoor side of the pivot shaft 18, so the elastic force of the spring 16 acts in a direction to open the shutter plate 15.

(G) Effects of the Invention The present invention enables reliable closing of the shutter plate in a wind pressure shutter device by preventing it from flapping when it is closed, and reliable opening when the shutter plate is opened, and improves the durability of the spring that biases the shutter plate. It is possible to improve performance and maintain stable performance over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a ventilation fan using the device of the present invention.
FIG. 2 is a sectional view of the device of the present invention shown in FIG. 1 when opened, FIG. 3 is a sectional view of another embodiment of the device of the invention, and FIG. 4 is a sectional view of the device shown in FIG. 3 when opened. ,
Figure 5 is an enlarged sectional view of the main part of Figure 3, and Figure 6 is an enlarged cross-sectional view of the main part of Figure 4.
FIG. 2 is an enlarged cross-sectional view of the main part of the figure. 3... Frame body, 15... Shutter plate, 16... Spring, 18... Pivot shaft.

Claims (1)

[Claims] 1 A shutter plate that is opened by wind pressure is pivotally supported at the outdoor opening of a frame that is inserted into an opening formed in a chamber wall, and the shutter plate is biased in the closing direction when it is closed and biased in the opening direction when it is opened. In this wind pressure shutter device, a spring is installed between the shutter plate and the frame body, and the spring is always located close to one side of the frame body regardless of whether the shutter plate is opened or closed.