JPS581718Y2 - Shutter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shutter device that is improved to prevent vibration noise from being generated due to flapping of the shutter due to the influence of outside wind.

For example, in a ventilation fan equipped with a shutter that opens to wind pressure, the shutter tends to flap and vibrate under the influence of outside wind.

On the other hand, the shaft supporting the shutter is a thin metal wire, and if it is bent into an arched shape, the shaft will swing around due to the vibration of the shutter and come into contact with the shutter, producing a hitting sound (vibration sound). was there.

Therefore, the purpose of the present invention is to prevent the generation of vibration noise caused by the flapping of the shutter by providing the shaft that supports the shutter with an elastic tube that makes frictional contact with both the shaft and the shutter. To provide shutter equipment.

An embodiment in which the present invention is applied to a ceiling ventilation fan will be described below with reference to the drawings.

Reference numeral 1 denotes an outer box of a ventilation fan, which has an air intake port 2 on the lower surface that faces the room below through a hole formed in a ceiling wall (not shown).
It also has an exhaust port 3 on one side located in the attic area.

A casing 4 is disposed inside the outer box 1 and has an inlet 5, and a fan 7 driven by a motor 6 is provided inside the casing.

Reference numeral 8 denotes a ventilation cover which also serves as a decorative cover and is removably attached to the air intake port 2 of the outer box 1 with mounting screws 9.

Now, 10 is the outer frame of the shutter device 11 connected to the exhaust port 3 of the outer box 1. This is formed into a tapered cylindrical shape, and has a ventilation port 12 on its tip surface. An exhaust duct 13 facing outdoors is connected to the vent 12.

Reference numeral 14 denotes a pair of support pieces bent inward at an upper portion of the opening periphery of the vent 12, and a shaft 15 made of a thin metal wire is rotatably installed between these pieces. are doing.

16 is a roughly disc-shaped shutter that opens and closes the vent 12;
A pair of bearing pieces 17 are bent at an upper portion of the peripheral edge, and an insertion hole 17 formed in each of these bearing pieces 17 is formed.
By inserting a shaft 15 through a, a tongue piece 1 is provided with a shutter 16 whose lower end protrudes from the lower end peripheral edge of the vent 12.
It is supported on an outer frame 10 via a shaft 15 in an inclined state so as to be located outside of the frame 8 so as to be rotatable in opening and closing.

A buffer body 19 is fixed to the outer surface of the tongue piece 18.

Reference numeral 20 denotes an elastic tube made of vinyl chloride, for example, which is inserted through the shaft 15 so as to be interposed between both bearing pieces 17 of the shutter 16.
Therefore, as shown in FIG. 3, the tube 20 is compressed between the two bearing pieces 17 and elastically deformed in a meandering manner, and its restoring force causes the tube 20 to deform at both ends. is in frictional contact with the side surface of each bearing piece 17, and the inner peripheral surface is in frictional contact with the shaft 15.

The free length of the tube 20 is preferably set to be approximately 1 to 3 mm longer than the distance between the receiving pieces 17 on both sides of the shutter 16.

Then, when the motor 6 is energized and the fan 7 is rotated,
Indoor air is sucked into the casing 4 from the intake port 5 via the ventilation cover 8 and the intake port 2, and is drawn into the casing 4 from the exhaust port 3 to the outer frame 1.
The air is blown to 0, the wind pressure rotates the shutter 16 upward to open the vent 12, and the air is discharged outdoors through the exhaust duct 13.

Now, when the motor 6 is cut off and the fan 7 is stopped, the shutter 16 rotates downward around the shaft 15 due to its own weight, and is blocked by the buffer body 19 of the tongue piece 18 and the air vent 12
will be closed.

By the way, when the ventilation operation is stopped, the shutter 1
6 may flap due to the influence of outside wind, etc., but since the chirve 20 is in frictional contact with both the shaft 15 and the bearing piece 17 of the shutter 716, so-called play between the shaft 15 and the bearing piece 17 is prevented. is suppressed and the tendency of integration is strengthened, so even if the shaft 15 is bowed, the shutter 1
There is no risk that the shaft 15 will swing around due to vibrations caused by the fluttering of the shaft 6.

Therefore, if the shaft 15 is arched, the convex side due to the arch should be the ring shutter 16 side so that it does not come into contact with the shutter 16, even if the shutter 16 vibrates. Since it does not come into contact with the shaft 15, it is possible to prevent the occurrence of hitting sounds (vibration sounds).

Furthermore, even if the shaft 15 swings around and comes into contact with the shutter 16, the shock at the time of contact is alleviated by the buffering effect of the tube 20, so there is little risk of producing a hitting sound.

You may be wondering whether it would be better to fix the shaft to the shutter in advance, but doing so would make it difficult to assemble the shaft by inserting it into the supporting piece of the outer frame, so in reality It is difficult to implement.

The reason why the shaft 15 is arched is considered to be because the shaft 15 is elastically deformed into an arched shape during assembly, and both ends of the shaft 15 are inserted and supported by the support pieces 14 and 14 from inside.

The present invention is not limited to shutter devices for ceiling ventilation fans, but can be widely applied to shutter devices in general, and can be implemented with appropriate modifications without departing from the gist thereof.

As explained above, the present invention involves inserting a tube made of an elastic material into the shaft that supports the shutter in a compressed state in the axial direction, and the restoring action of the tube causes friction against both the shaft and the bearing piece of the shutter. By making them contact each other, the frictional force generated between the shaft, tube, and bearing piece of the shutter can suppress relative rotation between the shutter and the shaft, thereby preventing the influence of outside wind. Even if the shutter vibrates due to flapping, there is no risk of the shaft swinging around and coming into contact with the shutter. Therefore, it is possible to prevent the occurrence of hitting noise (vibration noise) due to contact between the two, and to prevent the shaft from swinging. Even if it rotates and comes into contact with the shutter, the impact is alleviated by the buffering effect of the tube, so there is almost no risk of making a banging sound, which is an excellent effect.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a vertical cross-sectional view of the entire ceiling ventilation fan, Fig. 2 is an enlarged view taken from the direction of the arrow II-II in Fig. 1, and Fig. 3 is an enlarged view of the ceiling fan. FIG. 2 is an enlarged view of a main part shown partially in section. In the drawing, 1 is an outer box, 2 is an intake port, 3 is an exhaust port, 10 is an outer frame, 11 is a shutter device, 12 is a vent, 14 is a support piece, 15 is a shaft, 16 is a shutter, and 17 is a bearing piece. , 19
is a buffer, and 20 is a tube.

Claims (1)

[Scope of utility model registration request] A shutter comprising an outer frame having a vent, a shaft supported by the outer frame, and a pair of bearing pieces, and rotatably supported by inserting the bearing pieces into the shaft to open and close the vent. and,
A tube made of an elastic material is inserted into the shaft in a compressed state in the axial direction so as to be located between the two bearing pieces, and comes into frictional contact with both the shaft and the side surface of the bearing piece due to its restoring action. Shutter device that warns against