JP2508150B2 - Ventilation fan shutter device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shutter device for a ventilation fan for opening and closing a ventilation opening of the ventilation fan as needed.

[Prior Art] A conventional shutter device for a ventilation fan includes a shutter blade supported on the ventilation fan main body side with an intermediate point of an arm portion that has entered the ventilation fan main body side as a fulcrum of opening / closing movement, and opening / closing of the shutter blade in the arm portion. The structure is provided with a vertically movable connecting plate that is rotatably connected to the connection fulcrum with the position separated from the fulcrum of movement as the connection fulcrum. A plurality of shutter blades are connected to each other by a connecting plate, and when the ventilation fan is used, the shutter blades are opened together. Among these types, among those disclosed in Japanese Utility Model Publication No. 47-33555 and Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent Laid-Open No. 108942, there is a structure in which a spring is provided on a connecting plate which is a means for opening and closing the shutter blade so that the shutter blade is always closed when the ventilation fan is not used.

[Problems to be Solved by the Invention] In the conventional shutter device for a ventilation fan described above, a shutter is provided in the connecting plate that is the opening means of the shutter blade so that the shutter blade is always closed. The operating load increases in proportion to the expansion of the spring, the operating force becomes heavy, and the force resists the pressure of the blown air. Further, when the operating load is reduced, the load of the shutter blade in the closed state becomes weak, and there is a problem that the shutter blade flickers against the outside wind. The present invention has been made to solve such problems,
An object of the present invention is to obtain a shutter device having a simple structure, a small operation load for opening operation, and a stable closed state.

[Means for Solving the Problems] A shutter device for a ventilation fan according to the present invention is disposed in a ventilation opening of a ventilation fan main body, and uses the midpoint of an arm part that has entered the ventilation fan main body as a fulcrum for opening and closing the ventilation fan main body. Side of the shutter blade, and a position separated from the fulcrum of the opening / closing motion of the arm portion of the shutter blade as a connection fulcrum of a ventilation fan rotatably connected to the vertically movable connection plate. In the shutter device, a line connecting the fulcrum of the opening and closing movement of the shutter blade and the connecting fulcrum, and a line parallel to the center line of the ventilation fan make the direction of the spring force acting in the closed state parallel to the center line of the ventilation fan. The auxiliary spring is stretched between the connecting plate and the main body of the ventilation fan so that the angle formed by the straight line becomes smaller.

[Operation] The angle formed by the line connecting the fulcrum of opening and closing of the shutter blade and the connection fulcrum and the line parallel to the center line of the ventilation fan is parallel to the direction line of the force of the auxiliary spring and the center line of the ventilation fan. If it is larger than the angle formed by the line, the compressive force of the auxiliary spring in the closed state acts in the direction of closing the shutter blade,
In addition, the angle formed by the line that connects the fulcrum of opening and closing movement of the shutter blade and the connection fulcrum with the line that is parallel to the center line of the ventilation fan when the shutter blade opens and the force of the auxiliary spring and the line that is parallel to the center line of the ventilation fan. When the angle is smaller than the angle formed by the direction line acting by, the compressive force of the auxiliary spring acts in the direction of opening the shutter blade by that angle.

[Embodiment] FIG. 4 to FIG. 6 each show a shutter device of a ventilation fan as an embodiment of the present invention. In addition, FIGS. 1 and 2 show a fulcrum of a partial operation excluding an auxiliary spring as a supplement to the present invention. The basic configuration of the shutter device of this example is a plurality of vertical units which are arranged in a ventilation opening opening on the back surface of the ventilation fan main body 1 and in which an opening / closing fulcrum 3 is provided on an arm portion 2 that has entered the ventilation fan main body 1 side. A row of shutter blades 4 and a vertically movable connecting plate 6 rotatably connected to the connecting fulcrum 5 at a position apart from the opening / closing fulcrum 3 of the arm portions 2 of the shutter blades 4 as a connecting fulcrum 5. And.

Each shutter blade 4 has a pin formed on a pin plate 7 screwed to the inside right and left of the ventilating fan opening of the ventilating fan main body 1 through a hole provided in an intermediate portion of each arm portion 2, and a fulcrum for upward and downward movement. 3 is configured and is configured to rotate at this fulcrum 3. The connecting plate 6 connecting the shutter blades 4 is formed in an L-shape or a T-shape, and elastic pins 8 (first holes) formed of elastic bodies are formed in the holes provided in the arm portions 2 of the shutter blade 4. (See FIG. 3) to form a connection fulcrum 5 and connect the shutter blades 4 in the vertical direction. A mounting hole 9 is provided on the free end side of a portion of the connecting plate 6 that extends laterally from the blade connecting side. Then, when the connecting plate 6 is pulled downward, each shutter blade 4 is opened / closed by the fulcrum 3
It rotates and opens at. If a force on the open side is applied to the shutter blade 4 that is closed, the shutter blade 4 is opened while moving the connecting plate 6 downward. The shutter blade 4 in the open state has its holding force removed, and if left in a free state, it will be closed and closed by its own weight.

In the shutter device of this example, in the above-described configuration, the connection fulcrum 5 between the connection plate 6 and each arm portion 2 of the shutter blade 4
Can be changed to two positions. That is, holes 10 having different distances from the fulcrum 3 for opening and closing movements are provided in the arm portion 2 side by side in the horizontal direction when the shutter blade 4 is closed. The plates 6 are configured so that they can be connected by elastic pins 8. FIG. 1 and FIG. 2 each show that the connecting plate 6 and the shutter blade 4 are connected using the hole 8 that is close to the fulcrum 3, and FIGS. 4, 5 and 6 are shown. Indicates that the connecting plate 6 and the shutter blade 4 are connected using a hole 10 far from the fulcrum 3. In the former case, the force F required to open the shutter blade 4 is large, and the vertical stroke of the connecting plate 6 is small. Further, in the latter case, since the length of the arm becomes long, the force F required for the opening operation becomes small, and the vertical stroke of the connecting plate 6 becomes long. In the shutter device of this example, the connecting plate 6 is provided with an auxiliary spring 11 for reducing the force F required for the opening operation regardless of the change of the connecting fulcrum 5 (see FIGS. 4 and 5). The auxiliary spring 11 is a line connecting the fulcrum 3 of the opening / closing movement of the shutter blade 4 and the connection fulcrum 5 between the attachment hole 9 of the connecting plate 6 and the locking portion 12 of the pin plate 7 fixed to the ventilation fan body 1. It is mounted so that the angle D ° formed by the acting direction line of the spring force in the closed state is smaller than the angle C ° formed by. As a result, the compressive force of the auxiliary spring 11 acts on the arm portion 2 in the direction of closing the shutter blade 4 by an amount larger than the angle C ° and the angle D °. When the shutter blade 4 opens and the angle C ° becomes smaller than the angle D °, the compressive force of the auxiliary spring 11 is reduced by the angle.
Acts in the direction of opening. Without the auxiliary spring 11, when the opening angle E ° of the shutter blade 4 is small, the opening load of the shutter blade 4 is also small, and therefore the shutter blade 4 moves even if a slight wind pressure is applied to the shutter blade 4. When the auxiliary spring 11 is provided, the opening load is not related to the opening angle E ° of the shutter blade 4, and when the opening angle E ° is small, the angle C ° is large and the angle D ° is large, so the shutter blade 4 is opened by the action of closing. When the load becomes large and the opening angle E ° is large, the angle C ° becomes smaller than the angle D °, so that the opening load becomes small due to the action of opening the shutter blade 4, and the movement of the shutter due to the blowing pressure is reduced to ensure a reliable open state. Is obtained. Therefore, the flap of the shutter blade 4 in the closed state can be prevented.
In the illustrated example, the angle C ° is 25 ° and the angle D ° is 20 °. When there is no difference between the angle C ° and the angle D °, the opening load of the shutter blade 4 when the shutter blade 4 is closed cannot be increased.

Fig. 7 shows the opening angle E ° and the opening load (this is the force F
Is the same as the above), showing the experimental data showing the relationship
The dashed-dotted line shows the case of FIGS. 1 and 2, the solid line shows the case where the auxiliary spring 11 of FIGS. 4, 5, and 6 is removed, and the broken line shows the case where the auxiliary spring 11 is also attached, The load of the auxiliary spring 11 is 200 grams at an opening angle of 0 ° and 160 grams at an opening angle of 60 °.

Further, in this example and the ventilation fan shutter device, by changing the connecting plate 6, the arm portion 2 of the shutter blade 4 and the connecting fulcrum 5, the opening / closing operation of the shutter blade 4 is adjusted and ensured according to the application of the exhaust fan. Therefore, it is not necessary to change the positional relationship of the shutter blade 4 with respect to the ventilation fan main body 1 and the positional relationship of the pin plate 7 supporting the shutter blade 4 with respect to the ventilation fan main body 1, and the upper end portion of the shutter blade 4 is large. Since it does not enter, it is possible to reduce the thickness of the ventilation fan main body 1.

[Effects of the Invention] As is apparent from the description of the embodiments, according to the present invention, regardless of the opening angle, the opening load of the shutter blade is large when the opening angle is small, and when the shutter blade is in the closed state. Flapping of the blade can be prevented. Further, when the opening angle is large, the load is small, and the blower pressure can surely open the shutter.

[Brief description of drawings]

4 and 5 show an embodiment of the present invention using an auxiliary spring, which is a structural view showing the shutter device when opened and closed, FIG. 6 is a perspective view of FIG. 4, and FIG. 7 is an embodiment. 3 is a perspective view showing elastic pins, FIG. 3 and FIG. 2 are supplementary operation examples showing the opening and closing of the shutter device without the auxiliary spring. FIG. In the figure, 1 is a ventilation fan main body, 2 is an arm part, 3 is a fulcrum,
4 is a shutter blade, 5 is a connecting fulcrum, 6 is a connecting plate, 10
Is a hole, and 11 is an auxiliary spring. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

(57) [Claims] 1. A shutter blade, which is disposed on a ventilation opening of a ventilation fan main body and is supported by the ventilation fan main body, with an intermediate point of an arm portion that has entered the ventilation fan main body as a fulcrum for opening and closing, and the arm of the shutter blade. In a shutter device of a ventilation fan, which is rotatably connected to a vertically movable connecting plate with a connection fulcrum at a position apart from the opening / closing fulcrum of the shutter part, a shutter blade opening / closing fulcrum and a connection fulcrum are provided. The angle between the line connecting the lines and the line parallel to the center line of the ventilation fan is smaller than the angle between the direction of the spring force acting in the closed state and the line parallel to the center line of the ventilation fan. A shutter device for a ventilating fan, wherein a spring is stretched between the connecting plate and the ventilating fan main body.