JPH0343552Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a rooftop ventilation fan installed on the roof of a building such as a factory or warehouse to ventilate the inside of the building. The present invention relates to a rooftop ventilation fan that includes a plate and that is driven by a drive device.

[Conventional technology]

Conventionally, such rooftop ventilation fans include the one shown in Figure 9 (for example, the
(Published in Publication No. 59-185527).

This rooftop ventilation fan includes a ventilation fan stand 1 which is formed with a ventilation opening 2 and is installed on the rooftop, and a fan 4 rotated by a drive motor 3 is disposed within this ventilation fan stand 1. . This drive motor 3
is fixedly held on the ventilation fan stand 1 via a support rack 5 such that the upper end of the fan 4 is located slightly inside and below the opening 2. Further, a cover 6 that is spaced apart from the opening 2 and covers the opening 2 is fixedly supported on the ventilation fan stand 1 by a support 7 that is erected on the opening edge 2a. Further, a damper plate 8 is provided between the opening 2 and the cover 6, and is moved up and down by a drive device 10 to open and close the opening 2. This drive device 10 includes an elevating member 11 which is rotatably suspended from a cover 6 via a holder plate 9 and has a male screw portion formed on its outer periphery, and an elevating member 11 which is inside the elevating member 11 and is fixed to the holder plate 9.
1 and a motor 12 that rotates the motor 1. on the other hand,
A female threaded portion 13 is formed in the center of the damper plate 8 , and the damper plate 8 is screwed onto the elevating member 11 at the female threaded portion 13 .

When opening the damper plate 8,
The lifting member 11 is rotated by the drive of the motor 12 to raise the damper plate 8, and the fully open position of the damper plate 8 is detected by the fully open position detection switch 14 as a detection means attached to the holder plate 9, and the fully open position is detected. Based on the detection signal from the detection switch 14, the motor 12 is controlled by a control device (not shown).
Stops driving. In this state, fan 4
, and exhaust air from opening 2.

On the other hand, when closing the damper plate 8, the motor 12 reverses the lifting member 11 to lower the damper plate 8, and the fully closed position detection switch 15 as a detection means attached to the ventilation fan stand 1 closes the damper plate. The fully closed position of the motor 8 is detected, and the drive of the motor 12 is stopped by the control device based on the detection signal from the fully closed position detection switch 15.

By the way, depending on the size of the building such as a factory or warehouse, it is necessary to install rooftop ventilation fans with different exhaust capacities. For this reason, several types of rooftop ventilation fans with different exhaust air volumes are available. The exhaust air volume is determined mainly by changing the fan diameter, but also by changing the width between the opening 2 of the ventilation fan base 1 and the damper plate 8 in the fully open state (hereinafter referred to as "opening/closing stroke S"). is also set.

Therefore, in each model, a ventilation fan stand that matches the fan diameter, a corresponding cover and damper plate are used, and the opening/closing stroke S
The distance between the cover 6 and the ventilation fan stand 1 (hereinafter referred to as "cover height H") is set correspondingly.
That is, for models with a large exhaust air volume, the opening/closing stroke S and cover height H are set large, and for models with a small exhaust air volume, the opening/closing stroke S and cover height H are set small.

[Problem that the invention attempts to solve]

By the way, in the case of such conventional rooftop ventilation fans, the drive device 10 cannot be shared among different models, so a different drive device must be used for each model, which reduces production efficiency. There was a problem that I was using it.

For example, to explain this using the model shown in Fig. 9, a model with a larger exhaust air volume than this model has a larger opening/closing stroke S and cover height H, but if the above drive device is applied to this model as is, This is because the length of the member 11 is insufficient and the damper plate 8 cannot be closed.

On the other hand, a model with a smaller exhaust air volume than this one has a smaller opening/closing stroke S and cover height H, but if the above drive device 10 is applied as is to this model, there will be no storage space for the elevating member 11.
The elevating member 11 comes into contact with the fan 4.

Note that it is not possible to lower the fan 4 to widen the storage space for the elevating member 11 because this would result in a decrease in the suction efficiency of the fan 4.

Therefore, an object of the present invention is to enable the drive device to be used as is even if the opening/closing stroke S and the cover height H change.

[Means for solving problems]

The technical means of the present invention for solving such problems is to provide a screw rod which is rotatable to either the cover or the plate and whose axis is along the surface direction of the plate; a motor provided on either one of the screw rods for rotationally driving the screw rod; a pair of runners that are screwed onto the screw rod and move toward or away from each other as the screw rod rotates; a pair of arms that are movably attached and whose other ends are rotatably attached to either the cover or the plate, and the detection means is a runner that is attached to either the cover or the plate. A first detection switch that detects the runner when the runner approaches and sends out a detection signal, and a second detection switch that is installed on either one of the above and detects the runner and sends a detection signal when the runner is away from the runner. At the same time, the detection position of at least one of the first detection switch and the second detection switch is made variable.

[Effect]

According to this means, when the screw rod is rotated by a motor, the runner approaches until it is detected by the first detection switch or moves away until it is detected by the second detection switch. As the opening angle of the cover changes, the arm expands and contracts, and the plate is pulled toward or pushed away from the cover, thereby opening and closing the plate.

In addition, by changing the position of the variable detection switch, the stopping position of the runner can be changed, and thereby the extension width of the arm can be changed, so the opening/closing stroke of the plate can be adjusted.

Therefore, since the drive device opens and closes the plate by extending and contracting the arm, even if the height of the cover changes, the cover can be stored between the cover and the plate by simply changing the position of the detection switch.

〔Example〕

Hereinafter, a rooftop ventilation fan according to an embodiment of the present invention will be described in detail based on the accompanying drawings.

As shown in FIGS. 1 and 5, this rooftop ventilation fan includes a ventilation fan stand 21 in which an opening 20 is formed, as in the conventional case, and a drive motor 23 to which a fan 24 is attached is connected via a support frame 25. It is fixedly held on the ventilation fan stand part 21. Further, a cover 26 covering the opening 20 is fixedly supported on the ventilation fan stand 21 by a support 27 erected on the opening edge 20a. A holder plate 29 is fixed to the back surface of this cover 26. Further, a damper plate 28 is provided between the opening 20 and the cover 26, and is moved up and down by a drive device 30, which will be described later, to open and close the opening 20. An outward flange 2 formed at the opening edge 20a of the opening 20 is formed on the peripheral edge of the damper plate 28.
A gasket 22 that makes elastic contact with 0b is attached.
The inner surface of this packing is formed into a concave shape, and the tip of the elastic contact portion 2 makes elastic contact with the outward flange 20b.
2a.

As shown in FIG. 2, the drive device 30 according to this embodiment includes a screw rod 31, a runner 37,
38, arms 41 and 42, and a holding member 40.

The screw rod 31 is formed with a forward thread from the center toward one end, and a reverse thread toward the other end. Also, screw rod 3
1 is rotatably supported by holder members 32 and 33. Furthermore, guide rods 34 and 35 are arranged on both sides of the screw rod rod 31 and are fixed to the holder members 32 and 33. The holder members 32 and 33 are fixed to the holder plate 29 so that the axis of the screw rod 31 extends along both directions of the damper plate 28.

Further, one of the holder members 32 is equipped with a drive motor 36 for rotationally driving the screw rod 31 and a reduction gear (not shown).

Further, runners 37 and 38 are installed in the screw holes 3 in the forward threaded portion and reverse threaded portion of the screw rod 31, respectively.
They are screwed together at 7a and 38a, and are moved toward or away from each other as the screw rod 31 rotates. Further, the runners 37, 38 have guide rods 34, 3 in holes 37b, 38b opened on both sides of the screw holes 37a, 38a.
5 so as to be slidable.

Further, the runners 37 and 38 are connected to the holding member 40 using two pairs of arms 41 and 42. One end of each arm 41, 42 is connected to a runner 3, respectively.
7 and 38, and the other end is rotatably supported by a holding member 40. The holding member 40 is fixed to the center of the damper plate 28. The set of arms 41 and 42 constitutes a link mechanism that contracts and pulls up the holding member 40 when the runners 37 and 38 are separated, and expands and pushes down the holding member 40 when the runners 37 and 38 approach.

In addition, in this rooftop ventilation fan, the detection means is
It is composed of first and second detection switches 45 and 46 of limit switch type. The first detection switch 45 is supported by the holder plate 29 via a switch support device 50 on the movement path of one runner 38 and on the other runner 37 side. On the other hand, the second detection switch 46
The above-mentioned holder member 33 is located outside on the movement path of
is fixed. This first detection switch 45
When runners 37 and 38 approach, one runner 3
The second detection switch 46 contacts one of the runners 38 and sends a detection signal when the runners 37 and 38 are separated.

Switch support device 5 for first detection switch 45
0 is a stop member 5 to which the first detection switch 45 is fixed with a screw 52, as shown in FIGS. 3 and 4.
1, and a rail member 53 that is inserted between the first detection switch 45 and the stop member 51, extends in the moving direction of the runners 37 and 38, and is fixed to the holder plate 29, and the stop member 51 is connected to the rail. Part 5
The position of the first detection switch 45 is made variable by sliding it on the rail member 53, and the first detection switch 45 is fixed to the rail member 53 by tightening the screw 52.

The holder plate 29 also includes a control unit 6.
0 is attached. This control unit 60
receives an opening/closing signal from a device not shown, rotates the motor 36 in the direction in which the runners 37 and 38 approach in response to the closing signal, and rotates the motor 36 by receiving a detection signal from the first detection switch 45. make it stop. On the other hand, this control unit 60 rotates the motor 36 in the direction in which the runners 37 and 38 are separated by the above-mentioned open signal, and stops the motor 36 upon receiving the detection signal from the second detection switch 46. In addition, the reference numeral 61 in FIG. 1 is a conduit for the above-mentioned open/close signal and for the power source of the motor 36.

Next, the opening/closing operation of the damper plate 28 of the rooftop ventilation fan will be explained. In this case, it is assumed that the first detection switch 45 is fixed approximately at the center of the rail member 53, and the damper plate 28 is set to a predetermined opening/closing stroke S.

Normally, the damper plate 28 is in the closed position with the opening 20 closed, as shown in FIG. When an open signal is sent to the control unit 60 in this state, the motor 36 is activated and the screw rod 3
1 rotates, and the runners 37 and 38 move in a direction away from each other. As a result, arms 41, 42
is reduced, and the damper plate 28 is raised via the holding member 40 and drawn toward the cover 26.
Then, as shown in FIG. 6, the runners 37, 38
When the switch contacts the second detection switch 46, the control unit 60 is activated by the detection signal transmitted from the switch 46.
The motor is stopped and the damper plate 28 is held at the fully open position.

In addition, in this state, as shown in FIG.
8, reverses itself and wraps around the outside of the opening 20,
The gasket 22 on the peripheral edge of the damper plate 28 is formed in a concave shape.
Therefore, the exhaust air F is rectified and prevented from becoming turbulent. Therefore, the damper plate 28
damper plate 28.
This prevents rattling.

On the other hand, as shown in FIG.
8 is in the open position, the control unit 6
When a close signal is sent to the runner 3, the motor 36 is activated, the screw rod 31 rotates, and the runner 3
7 and 38 move toward each other. As a result, the arms 41 and 42 extend, and the holding member 4
The damper plate 28 is lowered through the opening 2
Pushed towards 0. Then, as shown in FIG. 5, when the runners 37 and 38 come into contact with the first detection switch 45, the motor 36 is stopped by the control unit 60 based on the detection signal transmitted from the runners 37 and 38, and the damper plate 28 is completely moved. held in the closed position.

Next, a case will be described in which the above drive device 30 is used in a different model, for example, a model with a larger exhaust air volume than the above-mentioned model. In models with a large exhaust air volume, the fan diameter increases, and a ventilation fan base 21 that matches the fan diameter and a corresponding cover 2 are installed.
6 and damper plate 28 are used, and the cover height H is also set large.

In this case, it is only necessary to set the opening/closing stroke Sa from the opening/closing stroke S of the above-mentioned opening/closing stroke to an increase in the exhaust air volume. That is, as shown in FIGS. 7 and 8, first, the screw 52 of the switch support device 50 is loosened, and then the first detection switch 45 is slid together with the stopper member 51 in the _R1 direction in the figure. , is fixed to the rail member 53 at a required position (solid line in the figure). As a result, the runners 37 and 38 come into contact with the first detection switch 45 at closer positions, so that the extension width of the arms 41 and 42 becomes larger, and the desired opening/closing stroke Sa can be set.

On the other hand, for example, in the case of a model with a smaller exhaust air volume than the one described above, the opening/closing stroke S is set to a relatively small required stroke. In this case, the first detection switch 45 is slid in the direction of arrow _R2 in the figure and fixed to the rail member 53 at a required position. As a result, the expansion and contraction width of the arms 41 and 42 becomes smaller, and the opening and closing strokes can be set as required.

In the above embodiment, the first detection switch 45 is made variable in position, but the present invention is not limited to this, and the second detection switch 46 or both switches may be made variable. Furthermore, the detection switch 4
5 and 46 use a contact type detection switch, but the present invention is not limited to this, and a proximity switch such as a photoelectric switch may be used. Furthermore, the holding member 40 may be attached to the cover 26 side, and the screw rod 31 may be attached to the damper plate 28 side, and the design may be changed as appropriate.

[Effect of idea]

As explained above, according to the rooftop ventilation fan of the present invention, even if the distance between the ventilation fan base and the cover is different, and the opening/closing stroke of the plate must be changed, even if the model has a different exhaust capacity, the position of the detection switch can be adjusted. It can be stored between the drive unit cover and the plate by simply adjusting the opening/closing stroke by changing the . Therefore, the drive device can be shared between each model, and there is no need to prepare a separate drive device for each model, which can significantly improve production efficiency such as reducing manufacturing costs and improving assembly efficiency. can.

Furthermore, according to the present invention, even if there is a dimensional error in the manufacturing of the drive device or plate, and the stroke varies, the opening/closing stroke of the plate can be finely adjusted by slightly changing the position of the detection switch. It also has the effect of absorbing variations in

Furthermore, in the present invention, the load from the plate can be dispersed by a pair of arms and a pair of runners, and the runners can also be made relatively small, so the plate can be raised and lowered directly by a lifting member unlike the conventional method. Compared to this, the moment load from the plate acting on the screw rod can be significantly reduced, which improves the durability of the motor, and also has the effect of allowing the motor to be made smaller. .

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing a rooftop ventilation fan according to an embodiment of the present invention, Figs. 2 and 3 are a perspective view and an exploded perspective view of the main part thereof, and Fig. 4 is the middle part of Fig. 3. Line sectional views, FIGS. 5 and 6 are sectional views showing the action of the rooftop ventilation fan according to the embodiment, and FIGS. 7 and 8 are
The figure is a sectional view showing another effect, and FIG. 9 is a sectional view showing an example of a conventional rooftop ventilation fan. 20...Opening, 21...Ventilation fan stand, 26...
Cover, 28... Damper plate, 29... Holder plate, 30... Drive device, 31... Screw rod, 37, 38... Runner, 40... Holding member, 41, 42... Arm, 45... First detection switch, 46...Second detection switch, 5
0... Switch support device, 60... Control unit.

Claims (1)

[Scope of Claim for Utility Model Registration] A ventilation fan stand in which a ventilation opening is formed, a cover fixed to the ventilation fan stand and spaced apart from the opening and covering the opening, and an opening between the opening and the cover. A rooftop ventilation fan comprising: a plate that opens and closes; a drive device that opens and closes the plate; and a detection means that detects the open and closed positions of the plate and issues a detection signal to stop the drive device. a screw rod rotatably provided on either one of the cover and the plate and whose axis line runs along the surface direction of the plate; a motor provided on either one of the above for rotationally driving the screw rod; a pair of runners that are screwed into the screw rod and move toward or apart from each other as the screw rod rotates; one end is rotatably attached to each of the runners, and the other end is rotatable to the other of the cover or plate; and a pair of arms that are freely attached, and the detection means includes a first detection switch that is provided on either one of the cover and the plate and that detects the runner and issues a detection signal when the runner approaches. , and a second detection switch that is provided on either one of the above and detects the runner and sends a detection signal when the runner is separated, and at least one of the first detection switch and the second detection switch. A rooftop ventilation fan characterized by a variable detection position on one side.