JPH0646108B2 - Wind pressure open / close type shutter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a wind pressure opening / closing shutter device used by being incorporated in a discharge opening of a ventilation passage or a ventilation fan.

(B) Conventional Technique As a technique prior to the present invention, there is a wind pressure open / close shutter device described in Japanese Utility Model Publication No. 61-7450. The shutter device is pivotally mounted on the outer frame so that it can be opened and closed, and opens by the wind pressure generated by the drive of the blower fan, and closes by its own weight when the blower fan is stopped. A connecting pestle that is connected to each other and that is displaced downward and upward with the opening and closing operations of the shutter, and is stretched between the connecting pestle and the outer frame to urge the connecting pestle downward to the shutter. And a tension spring that exerts a assisting force in the opening direction.

(C) Problems to be Solved by the Invention In the prior art, the connecting pestle always opens in the opening direction by the tension spring, so that it opens smoothly when it is opened, but it flaps when it is closed. Is likely to occur and abnormal noise is generated.

SUMMARY OF THE INVENTION It is a technical object of the present invention to provide a wind pressure open / close shutter device that prevents fluttering when the shutter plate is closed and opens smoothly when the shutter plate is opened.

(D) Means for Solving the Problems The present invention is directed to a plurality of shutter plates pivotally supported at the discharge side opening of a frame body, an interlocking rod for interlocking opening and closing of the shutter plates, and a pulling force between the interlocking punch and the frame body. A spring body, the line of action that connects the pivotal support between the shutter plate and the frame and the connection between the shutter plate and the interlocking punch, and the pulling direction line of the spring body intersect on the discharge side when the shutter plate is closed. The problem is solved by means of making the suction side intersect at the initial stage of opening the shutter plate.

(E) Action In the present invention, when the shutter plate is closed, the spring body applies a force in the closing direction to the interlocking pestle, and when the shutter plate is slightly opened by wind pressure, the spring body applies the force in the opening direction to the interlocking pestle. Give.

(F) Embodiment The present invention will be described based on the first embodiment used in the ventilation fan 1 shown in FIGS. 1 to 5 and the second embodiment shown in FIG.

1 is a cross-sectional view of the ventilation fan 1 with the shutter plate 2 closed, FIG. 2 is a cross-sectional view of the shutter plate 2 in the initial state where the shutter plate 2 starts to open due to wind pressure, and FIG. 3 is a state in which the shutter plate 2 is open. FIG.

The ventilation fan 1 has a rectangular frame body 3 inserted and supported in an opening formed in the chamber wall W, an electric motor 5 mounted at the center of a support rod 4 installed in the frame body 3, and a blower blade 6 driven by the electric motor 5. When,
The frame 3 has a front cover 8 elastically attached to a flange 7 stretched on the suction side opening edge, and a plurality of shutter plates 2 pivotably supported in the discharge side opening of the frame 3 so as to be openable and closable. The front cover body 8 is made of synthetic resin and forms a wind tunnel 9 surrounding the blower blades 6. An oil receiver 10 is detachably attached to the lower portion of the front cover body 8.

On both sides of the discharge side opening of the frame body 3, a shutter support body 12 having a pivot 11 that pivotally supports the shutter plate 2 is fixed by screws 13. The screw 13 is a shutter support from the outside of the frame body 3.
12 is screwed in, and the tip of the screw 13 located on the upper side projects from the shutter support 12. The upper end of the shutter plate 2 is connected by an interlocking pestle 14, and the shutter plate 2 and the interlocking pestle 14 are rotatably connected by a connecting portion 15 formed by a cashmere pin. A spring pad 5 is pulled between the frame 3 and the interlocking punch 14. One end of the spring body 16 is locked to the protruding portion of the screw 13, and the other end is locked to the locking portion 17 of the interlocking punch 14. In order to effectively use the pulling force of the spring body 16, the spring body 16 must be pulled to an appropriate length, so this embodiment bends a part of the interlocking pestle 14 in a dogleg shape, An engaging portion 17 is formed on the. The shutter support 12 is formed with a protrusion 18 that absorbs a collision sound when the shutter plate 2 is closed. The shutter plate 2 is pivotally supported on the frame body 2 via the shutter support body 12. The shutter support body 12 is a component of the frame body 3, and the shutter plate 2 is directly pivoted on the frame body 3. You may let me. However, in this embodiment, no hole is formed on the outer surface of the frame body 3, and the appearance is good.

With the opening and closing of the shutter plate 2, the lines of action connecting the pivot 11 and the connecting portion 15 change to A, B and C, and similarly the tension direction line of the spring body 16 also changes to D, E and F. When the shutter plate 2 is closed, the action line A and the pulling direction D are as shown in FIGS.
As shown in the figure, the frame 3 intersects on the discharge side. Therefore, the force F acting on the connecting portion 15 via the interlocking punch 14 is the line of action A.
On the other hand, by acting toward the upper side, the shutter plate 2 is biased about the pivot 11 in the direction of closing the shutter plate 2. As a result, the shutter plate 2 is prevented from fluttering due to the outside air, and its closing is ensured. When wind pressure acts on the inside of the shutter plate 2 due to the rotation of the sending blades 6, the wind pressure is larger than the closing force of the spring body 16, so the shutter plate 2
Starts to open, and the line of action B and the pulling direction E become parallel as shown in FIGS. 2 and 5. When the shutter plate 2 is further opened by the wind pressure beyond the position of being parallel, the action line C and the pulling direction line F intersect on the suction side with respect to the frame body 3 as shown in FIGS. 3 and 5. . Therefore, the force F acting on the connecting portion 15 via the connecting pestle 14 acts downwardly with respect to the line of action C, so that the shutter plate 2 is biased in the direction of opening the shutter plate 2 about the pivot 11. Become. As a result, shutter plate 2
Is released by the force of the spring body 16 added to the wind pressure,
The opening is performed smoothly, and even when outside air acts on the shutter plate 2 in the opened state, the stable opening can be maintained. Further, when the shutter plate 2 is opened, the force of the spring body 16 is applied in the opening direction, so that the shutter plate 2 does not have to be made of synthetic resin, stainless steel, aluminum, or the like, and can be formed of sheet metal.

The second embodiment shown in FIG. 6 relates to the locking of the spring body 16, in which the locking portion 20 at one end of the spring body 16 is formed in the shutter support 12. Therefore, unlike the first embodiment in which the screw 13 is also used, it is not necessary to use a specially long screw, and a screwing mistake at the time of assembly can be prevented.

The present invention is not limited to the above-mentioned embodiment, but a spring body
The present invention can be implemented with various structures within a range that does not change the relationship between the action line and the tensile direction line such as the structure of the urging portion 16 of the pulling structure, the interlocking pestle 14, and the like.

(G) Effect of the Invention According to the present invention, since a single spring body is used to change the biasing direction in each state of opening and closing with respect to the shutter plate, reliable opening and closing and smooth opening and closing can be performed.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a sectional view of a ventilation fan, FIG. 2 is a sectional view of a shutter plate in a half-opened state, and FIG.
FIG. 4 is a partial sectional view of the shutter plate opened, FIG. 4 is a sectional view of the interlocking pestle and the spring body portion, FIG. 5 is an explanatory view of opening / closing operation, and FIG. 6 is a sectional view similar to FIG. 4 of the second embodiment. Is. 2 ... Shutter plate, 3 ... Frame, 11 ... Axis, 14 ...
Interlocking pestle, 15 …… Coupling part, 16 …… Spring body, A, B, C ……
Line of action, D, E, F ... Line of tension direction.

Claims (1)

[Claims] 1. A shutter plate, comprising: a plurality of shutter plates pivotally supported at a discharge side opening of a frame body; an interlocking rod for opening and closing the shutter plate interlockingly; and a spring body tensioned between the interlocking rod and the frame body. When the shutter plate is closed, the line of action connecting the pivotal support between the frame and the frame and the connecting part between the shutter plate and the interlocking punch and the pulling direction line of the spring body intersect on the discharge side, and on the suction side in the initial stage of opening the shutter plate. A wind pressure open / close shutter device characterized by being intersected.