JPS6119891B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ventilation fan that opens and closes a shutter using the rotational force of an electric motor.

[Conventional technology]

Conventional shutter opening/closing devices use the rotation of a fan electric motor to open and close the shutter, and are complicated in that they have a mechanism that completely separates the fan electric motor from the shutter side after the shutter has been opened.

[Purpose of the invention]

To address the above drawbacks, the aim is to eliminate the above drawbacks by providing a synchronous motor exclusively for opening and closing the shutter, separate from the fan motor, and to use the reversing action of the synchronous motor to ensure that the shutter operates according to instructions. The aim is to provide something that works.

[Summary of the invention]

That is, the present invention uses a synchronous motor that can rotate in forward and reverse directions as a drive source for opening and closing the shutter, and stops the synchronous motor using a switch that opens and closes by detecting the completion state of opening and the completion of closing of the shutter. When the synchronous motor is rotated again after each of the above-mentioned completion states, the synchronous motor is rotated in the opposite direction to the previous rotation, and the fan motor and the shutter are controlled in conjunction with each other. It is.

In this way, since the shutter is opened and closed by a synchronous motor separate from the fan motor, the structure is simpler than that of the conventional one.

Further, since the opening/closing operation from the closed state to the open state and from the open state to the closed state is performed by the automatic reversing operation of the synchronous motor, the opening/closing operation is performed reliably as instructed.

〔Example〕

An embodiment of the present invention will be described below.

As shown in FIG. 1, the ventilation fan of the present invention includes a frame 1, a shutter 3 attached to the rear of the frame 1 so as to be openable and closable, a fan 4, a fan electric motor 5 for driving the fan 4, and a shutter 3. The motor includes a synchronous motor 6 that opens and closes the motors, an operation control switch 9 that controls the respective motors, and the like.

The synchronous motor 6 has a reduction gear and a drum 8. This speed reduction device is designed to reduce the rotation of the electric motor to about 1/100, so the rotor rotation of 500 RPM becomes 5 RPM on the drum 8 side.

The wire 7 wound around the drum 8 is the shutter 3
It is connected to the arm portion 11 of the connecting rod 10.
Further, the arm portion 11 is provided with a spring 12 that biases the shutter 3 in the closing direction.

Shutter 3 open completion state detection switch 13
and the closing completion state detection switch 14 are provided so as to face each other with the arm portion 11 in between.

FIGS. 2 and 3 show the circuit of the ventilation fan, in which the movable contact piece 9A of the operation control switch 9 is connected to one side of the power source. Further, the fixed contact 9B of the switch 9 is connected to the fan motor 5 and the fixed contact 13C of the open completion state detection switch 13.

The fixed contact 9C of the operation control switch 9 is connected to the fixed contact 14B of the closing completion state detection switch 14. The movable contact piece 14A of the closing completion state detection switch 14 and the movable contact piece 13A of the open completion state detection switch 13 are connected to one side of the synchronous motor 6, and the other end of the synchronous motor 6 is connected to the other end of the power supply and the fan motor 5. connected to the other end.

The circuit configuration has been described above. Next, the operation will be explained.

FIG. 2 shows a state in which the ventilation fan is stopped and the shutter 3 is closed. Next, shutter 3
When opening the ventilation fan and operating the ventilation fan, manually switch the operation control switch 9 to the fixed contact 9B side as shown in FIG. As a result, the fan electric motor 5 and the synchronous electric motor 6 rotate. Then, the wire 7 is wound around the drum 8, and the shutter 3 is gradually opened against the force of the spring 12. When the shutter 3 is completely opened, the arm 11 presses the push button 13' of the opening completion state detection switch 13, and the movable contact is activated. Piece 13A switches to fixed contact 13B. Since the circuit of the synchronous motor 6 is now opened, the synchronous motor 6 stops (see FIG. 3). Since the operation control switch of the fan electric motor 5 remains closed to the fixed contact 9B side, the operation continues.

In the above-mentioned shutter opening operation, when the shutter 3 starts to open, the arm portion 11 moves away from the push button 14' of the shutter completion detection switch 14, and the movable contact piece 14A becomes a fixed contact. The switch is switched from the piece 14C to the fixed contact 14B side, and preparation is made for the next shutter closing operation (see FIG. 4).

Next, to stop the ventilation fan, switch the movable contact piece 9A of the operation control switch 9 from the fixed contact 9B to the fixed contact 9C in the state shown in FIG.
(see figure), the fan electric motor 5 is disconnected from the power supply and therefore stops. On the other hand, since the movable contact piece 14A of the closing completion state detection switch 14 is connected to the fixed contact 14B, the synchronous motor 6 rotates in the reverse direction. When the synchronous motor rotates in reverse, the wire 7 is connected to the drum 8.
is released, the shutter 3 is gradually closed by the spring 12. When the shutter 3 is completely closed, the arm portion 11 activates the closing completion state detection switch 1.
By pressing the No. 4 push button 14', the movable contact piece 14A switches from the fixed contact 14B to the fixed contact 14C.
This opens the circuit of the synchronous motor 6, so the synchronous motor 6 stops.

In the above-mentioned shutter closing operation, when the shutter 3 starts to close, the arm portion 11 moves away from the push button 13' of the open completion state detection switch 13, and the movable contact piece 13A closes the fixed contact 13B. The second contact 13C switches to the fixed contact 13C in preparation for the next shutter opening operation.
Return to the state shown in the figure.

The shutter opening/closing operation described above is performed because the synchronous motor 6 reverses when the shutter is opened and when the shutter is closed, and this reversal operation will be described below.

It is assumed that the shutter 3 is opened by rotating the synchronous motor 6 in the forward direction. After the shutter 3 has been opened, the synchronous motor 6 is rotated again to close the shutter 3. If the synchronous motor 6 rotates in the forward direction due to the timing at startup, it will try to open the shutter 3 further, but it will not open any more, so the synchronous motor 6 is locked in the forward rotation direction. , the next time it starts it will flip in the opposite direction. In this way, the synchronous motor 6 rotates in the opposite direction and the shutter 3 is closed. Since the above-mentioned reversing operation is performed in an extremely short time, there is almost no difference in the shutter closing time compared to the case where the shutter is rotated in the opposite direction from the beginning.

Note that the above reversing operation is the same when the shutter 3 is opened.

Further, if the movement of the shutter 3 is temporarily restrained during the opening/closing of the shutter 3, the shutter 3 temporarily operates in the opposite direction to the operation instruction, but eventually returns to the normal state according to the operation instruction.

That is, as shown in FIG. 3, when an external force is applied that temporarily prevents the shutter from opening while the shutter 3 is being opened, the synchronous motor 6 reverses as described above, and the shutter 3 closes. do. Since the circuit of synchronous motor 6 is not opened,
The synchronous motor 6 is reversed again and moves to the operation of opening the shutter 3 again. In this way, shutter 3 opens as instructed.

Next, the maintenance of the open and closed states of the shutter 3 will be described.

That is, since the shutter 3 is urged in the closing direction by the spring 12, a holding force greater than the tensile force of the spring 12 is required to maintain the open state.

This holding force is obtained from the reduction means of the synchronous motor 6. Since the reduction means has a gear with a reduction ratio of about 1/100, the resistance force on the rotor side as seen from the drum 8 side is 100 times greater. This large resistance prevents the force of the spring 12, so the shutter 3 is maintained in the open state.

Since the closed state is maintained by the spring 12 and the speed reduction means, the shutter will not open during strong winds.

〔Effect of the invention〕

As described above, the present invention opens and closes the shutter using a small synchronous motor, and provides an opening completion state detection switch and a closing completion state detection switch for detecting the open/closed state of the shutter, and uses these switches to operate the shutter. Since we have constructed a simple circuit for operating the fan motor and the shutter in conjunction with each other, we have provided a ventilation fan that has a simpler construction and operates reliably compared to the conventional fan motor that opened and closed the shutter. It is something that can be done.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view of a ventilation fan, and FIGS. 2 to 5 are control circuit diagrams. 4...Fan, 5...Electric motor for fan, 6...
Synchronous motor, 13... Opening completion state detection switch, 14... Closing completion state detection switch.

Claims (1)

[Scope of Claims] 1. A frame body, a shutter attached to one opening of the frame body so as to be openable and closable, a fan electric motor also attached to the frame body, and a dedicated electric motor for opening and closing the shutter. In the ventilation fan, a small synchronous motor with a reduction gear is used as the motor for opening and closing the shutter, and an operation control switch for the fan motor, a shutter opening completion state detection switch, and a shutter closing completion state detection switch are also provided. , the operation control switch is connected between a power source and a fan electric motor,
One of the contacts is connected to the contact of the fan electric motor and the open completion state detection switch, the other contact is connected to the contact of the closure completion state detection switch, and the contact piece of this closure completion state detection switch is connected to the contact of the open completion state detection switch. The small synchronous motor is connected between both of these contacts and the power source, and the open completion state detection switch shuts off when the shutter is opened, and the closing completion state detection switch shuts off when the shutter is opened. 1. A shutter opening/closing device for a ventilation fan, characterized in that each contact piece is linked to the opening/closing operation of the shutter so that the shutter is turned on when the shutter is turned on.