JP3197896B2 - Spring return type control motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention [Industrial Application Field] The present invention relates to a spring return type control motor, and is particularly used for driving a shutoff valve in an emergency such as an air conditioner. .

[Background Art] Some valves for controlling the flow of steam or gas in an air conditioner must be operated immediately in the event of an emergency such as a fire. A spring return mechanism is used to open and close such valves. A spring return type control motor provided is used.

Conventionally used spring return type control motors, as seen in Japanese Patent Application No. 63-61766 filed by the applicant of the present application, have a complex structure of a reversible motor, a planetary gear unit, an electromagnetic brake mechanism, etc., and have a large output. Although suitable for use, it is expensive and could not be used for low-power, low-power use.

In view of this situation, the present applicant has filed a patent
Utilizing No. 09539 (Japanese Patent Publication No. 58-43625), a gear clutch device suitable for a spring releasing mechanism of a cheap and reliable spring return type control motor was invented.

FIG. 2 shows an embodiment of a spring return type control motor using the gear clutch device according to the present invention. The entire configuration (a), the state where the gear clutch device is engaged (b), and the engagement of the gear clutch device are released. Each state (c) is shown.

The main motor 101 can control forward and reverse rotation, and normal operation will be described first.

FIG. 2B shows the position of the movable plate 6 when the main motor 101 shown in FIG. 2A is controlled to rotate the gear 1 of the gear clutch device 100 in the CW direction.

The gears 2 and 2 'rotate in the direction in which the ratchet gear 5 provided on the movable plate 6 slides with respect to the gear 2', and the gear 3 provided on the movable plate 6 meshes with the gear 2 'and Is rotated in the CW direction, the gear 4 and the gear 3 are meshed, the gear 3 is rotated in the CCW direction, the output shaft gear 104 is rotated in the CW direction, the return spring 105 is involved, and a load damper or valve is provided. (Not shown) is rotated in the opening direction.

FIG. 2 (c) shows the position of the movable plate 6 when the load damper or valve (not shown) is closed, and the main motor 101 shown in FIG. 2 (a) is reversed from the position shown in FIG. 2 (b). When the gear 2 rotates in the CW direction, the gear 2 rotates in the CW direction, the ratchet gear 5 meshes with the gear 2 ', the movable plate 6 rotates in the CW direction, the gear 3 and the gear 4 disengage, and the output shaft 103 Rotates the load damper or valve (not shown) in the closing direction by the force of the return spring 105.

That is, when opening the valve etc., it is driven by the power of the main motor,
When closing, the main motor is rotated in reverse to disengage the gears 3 and 4 of the gear clutch 100 and return spring 105
It is operated by the force of.

When closing a valve or the like in an emergency such as a power outage, the main motor cannot be controlled. Therefore, the lever 10 protruding from the side of the movable plate 6 is manually operated from the outside to move the movable plate 6. Is rotated in the CW direction as shown in FIG.
Gear 3 and gear 4 are disengaged from each other and return spring
With the force of 105, the output shaft 103 operates in the direction to close the valve or the like.

[Problem to be Solved by the Invention] In the prior art spring return type control motor shown in FIG. 2, since the main motor cannot be controlled in an emergency such as a power failure, it is necessary to manually operate the lever 10. Yes, there was a problem with the response in an emergency.

Therefore, it is conceivable to adopt a configuration in which the main motor is a DC motor, a storage battery is provided as an emergency power supply, and in the event of a power failure, the power supply is automatically switched to the storage battery.However, this method requires a large capacity to operate the main motor. The area must be equipped with batteries, so large space and a lot of equipment costs are inevitable.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art with a simple configuration and to obtain a spring return type control motor capable of operating a valve or the like in response to an emergency such as a power failure.

(2) Configuration of the Invention [Means for Solving the Problems] The present invention includes a main motor 101 and a gear clutch device 100 controlled by the main motor 101, and an output shaft via the gear clutch device 100. By rotating 103, the output shaft
An auxiliary motor 201 including an auxiliary motor gear 202 is provided adjacent to the main motor 101 by a spring return type control motor in which a return spring 105 mounted on 103 is wound. Are configured to engage with the gear 102 of the main motor fixedly disposed on the main motor 1-1, and the auxiliary motor 2-
In order to reduce the current consumed by the auxiliary motor, a time constant circuit composed of predetermined elements is also arranged. I have.

[Operation] When the gear clutch device is disengaged, a large force is required to disengage the meshed gear with the pressing force of the return spring, but after the disengagement, the pressing force is almost eliminated. The drive power source can be rated for a short time,
A small auxiliary motor allows a large current to flow only at the time of starting to disengage the gear clutch device. After disengagement, the current is reduced to prevent battery consumption and to be compatible with small capacity batteries. .

[Embodiment] FIG. 1 is a configuration diagram (a) of a spring return type control motor embodying the present invention and a circuit diagram (b) showing a control circuit of an auxiliary motor.

In FIG. 1A, the auxiliary motor 201 is connected to the main motor 101.
A new configuration is that a gear 202 mounted on an auxiliary motor 201 is meshed with a gear 102 of a main motor, and the other is the same as the prior art. The meshing state of the gear clutch device is shown in FIG. ) And (c).

In the control circuit of FIG. 1 (b) is an auxiliary electric motor 201, the circuit, emergency stop command current flows and ON the switch S to the resistance R ₁ by the first transistor Q ₁ and the second transistor Q in two-stage amplifier circuit comprising more ₂ energizes the auxiliary electric motor 201, the voltage of the current detection resistor R ₂ resistor R ₃ and capacitor C
In addition to the time constant circuit and the third with transistor Q ₃ is energized when the voltage of the capacitor C exceeds the threshold hold voltage of the third transistor Q _3, a fourth transistor Q ₄ is energized Accordingly It started to rise the voltage of the control resistor R ₆ is, current of the transistor Q _1, thus operates to decrease the current of the auxiliary motor 201.

The auxiliary motor 201 shown in FIG.
Then, the gear 1 of the gear clutch device 100 is rotated in the CCW direction, the movable plate 6 is rotated in the CW direction as shown in FIG. 4C, the gear 3 and the gear 4 are disengaged, and the output shaft 103 is rotated. The valve is rotated by the force of the return spring 105 to close the valve and the like.

When the gear clutch device 100 is engaged, the force of the return spring 105 acts on the gear 4 and the gear 3, so a large force is required to disengage the force against this force, Until is removed, a large current is passed through the auxiliary motor 201, and after the disengagement, the motor can be rotated with a small force. Therefore, the current is reduced by a time constant circuit so that the battery consumption can be suppressed.

In the configuration shown in the figure, the auxiliary motor 201 uses a very small motor since it is operated only for a short time only in the case of emergency shutoff, so the battery of the power supply may have a small capacity,
For example, a miniature nickel cadmium battery is built in and always charged with a rectifier (not shown), and a circuit that operates in the event of an emergency such as a power failure is provided to prevent battery consumption, and a small and highly reliable emergency shutdown A spring return type control motor for driving a valve or the like can be configured.

[Effects of the Invention] Since the spring return type control motor according to the present invention has the above-described configuration, it can be used to drive a small and highly reliable emergency shutoff damper or valve.

[Brief description of the drawings]

FIG. 1 is an overall structural view (a) showing the structure of a spring return type control motor embodying the present invention, and FIG. 2 (b) is a drive circuit diagram of an auxiliary motor, and FIG. 2 is a prior art spring return type control motor. 2A, 2B, 2C, 2D, 2C, 2C, and 2C, which show an overall configuration diagram (a), a state diagram (b) in which the gear clutch device is engaged, and a state diagram (c) in which the gear clutch device is disengaged, respectively. DESCRIPTION OF SYMBOLS 1,2,2 ', 3,4 ... Gear of gear clutch device, 5 ... Ratchet gear, 6 ... Movable plate, 10 ... Lever, 100 ... Gear clutch device, 101 ... Main motor , 102: gear of main motor, 201: auxiliary motor, 202: gear of auxiliary motor,
103 ...... output shaft 104 ...... output shaft gear, 105 ...... return spring, E ...... battery, C ...... capacitors, R ₁ to R ₆ ......
Resistance, Q _{1 to} Q ₄ ...... Transistor, S ... Switch.

Claims (2)

(57) [Claims] An electric motor comprising: a main motor; and a gear clutch device controlled by the main motor;
In a spring return type control motor in which a return spring 105 mounted on the output shaft 103 is wound by rotating the output shaft 103 via 00, a gear 202 of an auxiliary motor is arranged adjacent to the main motor 101. The auxiliary motor 201 is provided in parallel with the gear 202 of the auxiliary motor. The gear 202 of the auxiliary motor is configured to engage with the gear 102 of the main motor fixedly disposed on the main motor 1-1. A spring return type control motor characterized in that a battery serving as a power source is built-in. 2. A circuit comprising an auxiliary motor, a second transistor, and a current detection resistor connected in series, a battery connected to both ends of the circuit, a (+) terminal of the battery, and a base of the second transistor. A first transistor connected between the first transistor and the base of the first transistor and the (+)
An input resistor connected between the first transistor, a switch and a control resistor inserted in series between the base of the first transistor and the (−) terminal of the battery;
A time constant circuit comprising a resistor and a capacitor connected between the terminal and the current detection resistor; and a third circuit having both terminals of the capacitor connected to its base and its collector connected to the base of the fourth transistor. 2. A spring return type control according to claim 1, further comprising a control circuit for an auxiliary motor having a transistor and a fourth transistor having a collector connected to a base of said first transistor. motor.