JPS5945901B2 - Damper opening/closing device - Google Patents

Description

Detailed Description of the Invention This invention is used for air conditioning and exhaust ducts in high-rise buildings, and the damper is kept in a closed state when the duct is not in use, and the damper is kept in an open state when the duct is in use. This relates to a damper opening/closing device that closes the damper when a problem occurs.

Conventionally, this type of damper opening/closing device uses a DC motor that rotates in both forward and reverse directions to open and close the damper, or a motor rotates the damper to open it, and a spring is used to close the damper. However, the former method has the disadvantage that the control device for the DC motor is complicated and the damper does not operate due to a power outage caused by a fire.

In the latter case, the closing action of the damper is rapid, which results in large noise and vibration when the damper is closed, and has the drawback of damaging the device.

This invention is based on the latter method and eliminates the above-mentioned drawbacks.

In other words, in order to open the damper when the duct is in use, a brush is pressed against the commutator surface of the DC geared motor by activating a solenoid, and power is supplied to the motor via the brush to rotate the damper until it rotates to the predetermined open position. When this occurs, the current to the DC geared motor is cut off to stop the rotation of the damper, and the solenoid is activated to keep the brush in pressure contact with the commutator surface, preventing reverse rotation due to the restoring force of the return spring and opening the damper. to hold.

When the duct is not in use or a fire occurs, the solenoid is de-energized, the brush is removed from the commutator surface of the DC geared motor, and the restoring force of the return spring causes the electromagnetic element to idle through the reduction gear of the DC geared motor, gently closing the damper. It is something to do.

One embodiment will be described below with reference to the drawings.

In the drawings, reference numeral 1 denotes a DC geared motor for driving the damper 1, on which an operating member 3 such as a cam and a damper 4 for opening and closing the duct 2 are installed. A helical return spring 5 is attached to the tip of the rotating shaft so that a force acts in a direction opposite to the rotating direction (see FIG. 1).

A solenoid 7 is wired to the commutator surface 6 of the DC geared motor so that it is energized when the duct is in use and de-energized when the duct is not in use, and the brush 10 is pressed or pressed by the operating rod 8 of the solenoid and the arm rod 9 connected thereto. It is configured so that it can be removed (see Figures 2 and 3).

Further, when the damper 4 rotates to a predetermined position, an opening end point limit switch 11 is connected to the actuating member 3 such as the cam to stop power supply to the DC geared motor 1 and limit the rotation angle of the damper in the opening direction. (4th
(see figure).

The solenoid 7 that brings the brush 10 into and out of contact with the commutator surface 6 of the DC geared motor 1 described above is connected to the output terminals a and a' of the power supply section A, which is converted into a predetermined DC voltage by the transformer 12 and the rectifier circuit 13. The geared motor 1 is connected to a power output terminal a in parallel with the solenoid 7 so as to be supplied with power via the opening direction end point limit switch 11.
, a'.

Reference numeral 14 denotes a current interrupting diode, which is connected between the movable contact terminal C of the open direction termination point limit switch 11 and the fixed contact terminal C on the power supply side, and when the short circuit is released by the operation of the cut switch. Connected to reverse bias polarity.

Reference numeral 15 denotes a short-circuiting diode, which is connected to a polarity that forms a closed circuit with the DC geared motor 1 and short-circuits the generated voltage of the motor when the open direction end point limit switch 11 is activated.

Note that 16 is a power switch, and 17 is an exhaust fan that rotates when the damper 4 is in an open state to forcibly exhaust the air.

In the above configuration, when using the damper, the power switch 16
When turned on, a predetermined DC voltage is applied to the solenoid via the transformer 12 and the rectifier circuit 13, the solenoid is excited, and the operating rod 8 of the solenoid and the arm rod 9 connected thereto are activated.
Therefore, the brush 10 is connected to the commutator surface 6 of the DC geared motor 1.
The brush 10 is electrically connected to the brush 10, and power is supplied to the DC geared motor to rotate the motor.

Therefore, the operating member 3 such as a cam and the damper 4 are rotated against the reaction force of the return spring 5, and when the operating member 3 such as the cam reaches a predetermined position, the opening direction end point limit switch 11 is set to 0FFL. The short circuit of the diode 14 connected between the movable contact terminal C of the limit switch and the fixed contact terminal C on the power supply side is removed, reverse bias is applied, and power supply to the DC geared motor is stopped.

At the same time, the contact of the limit switch 11 is switched to the fixed contact terminal d side connected to the diode 15, and a closed circuit is formed by the DC geared motor and the diode 15.
The voltage generated by the inertial rotation of the DC geared motor is short-circuited, and the motor is immediately stopped by the generated brake.

At this time, the solenoid 7 is energized and the brush 10 is in pressure contact with the commutator surface 6 of the DC geared motor, so that the rotation axis of the DC geared motor, that is, the damper shaft, is prevented from being reversed by the restoring force of the return spring 5.

In other words, since this invention uses a DC geared motor, even if the restoring force of the return spring acts on the rotating shaft, the force that rotates the armature due to the reduction gear is minimal.In other words, there is only a slight load that causes the armature to idle. However, due to the reduction ratio of the gear (approximately 400:1), the load is increased when viewed from the rotating shaft side, and since the commutator surface of the armature is pressed by the brush, the rotating shaft is There is no reverse rotation and the damper is kept open.

Note that the solenoid is always energized while the duct is in use.

Next, when you want to stop using the duct, turn the power switch 16 to OFF and de-energize the FFL solenoid 7, the brush 10 will detach from the commutator surface 6 of the DC geared motor, and the rotating shaft will move through the reduction gear due to the restoring force of the return spring 5. Due to the above-mentioned reason, the duct starts to rotate slowly in the reverse direction, turning on the limit switch 11 at the end point in the opening direction, and eventually the duct is closed.

Also, in the event of a fire, the duct is closed through the same process as described above by turning off the power switch 16 or by configuring the system to automatically turn off the power.

As explained above, this invention interconnects the DC geared motor, the return spring, and the mechanism for moving the brushes toward and away from the commutator surface through the operation of a solenoid, so that when the damper rotates to the open state, the current to the DC geared motor is When blocking the duct, the rotation of the damper is stopped and the rotation in the opposite direction (closing direction) is prevented by the action of the solenoid, which presses the brush against the commutator surface using the restoring force of the return spring. The brush is removed from the commutator surface, the armature is free to rotate, and the restoring force of the return spring causes the armature to idle in the opposite direction, gently rotating the damper in the closing direction, thereby eliminating large damper closing noise and vibration. It quietly closes the duct without causing damage to the equipment.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the damper opening/closing device, Fig. 2 is a circuit diagram showing an example of the damper opening/closing device, Fig. 3 is an enlarged front view of the main parts, and Fig. 4 is a diagram showing the state of use. . 1...DC geared motor, 2...Duct, 3...Cam, 4...Damper,
5... Return spring, 6... Commutator surface, 7... Solenoid, 10... Brush, 11... End point in opening direction Limit switch.

Claims (1)

[Claims] 1 Damper: A damper that opens and closes an operating member such as a cam and a duct is installed on the rotating shaft of the DC geared motor for driving, and a return spring is installed so that a force acts in the opposite direction to the rotational direction of the rotating shaft of the DC geared motor. On the other hand, by operating a solenoid that is energized when the duct is in use and de-energized when the duct is not in use, the brush can be moved toward and away from the commutator surface of the DC geared motor, and when the damper rotates to a predetermined position, the DC geared motor A damper opening/closing device comprising an opening end point limit switch for stopping power supply to the damper and limiting the rotation angle of the damper in the opening direction, in association with an operating member such as the cam.