JPS6029354Y2 - Operating status display circuit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operating status display circuit, and it is possible to determine whether a movable member that is driven by a reversibly rotatable drive motor is at one end of the movement or the other end of the movement. It can be indicated by a respective dot of a separate end position indicator lamp and is particularly suitable for remote control of electric valves.

Conventionally, the circuit shown in FIG. 1 is known as an operating circuit for an electric valve.

In FIG. 1, reference numeral 1 denotes a drive motor capable of reversible rotation, which is composed of a DC series motor, and is composed of an open field winding 2, a closed field winding 3, and an armature 4. ing.

Reference numeral 5 indicates an open limit switch, and 6 indicates a close limit switch, which are operated respectively at the fully open position and fully closed position of a valve (not shown) driven by the motor 1, and by this operation, the contacts 5a and 6a switch to the side indicated by the dashed line.

7 is a miniature relay, which has a normally closed contact 8.

9 is a power connector, which connects the motor 1, switch 5,
6. It is incorporated inside the valve together with the relay 7.

Reference numeral 10 denotes an indicator lamp, which is disposed outside the bulb.

In the state shown in FIG. 1, the valve is in an intermediate position between fully open and fully closed.

In this state, when a positive voltage for driving current is applied to the terminal A of the power connector 9, it passes through the contact 5a of the switch 5, the open field winding 2, the armature 4, and the contact 8 to the terminal E. A current flows, causing the motor 1 to rotate forward and opening the valve.

While the motor 1 is rotating, a lighting current is supplied from the diode 11 to the indicator lamp 10 via the terminal C.

When the valve is fully opened by the forward rotation of the motor 1,
As described above, the switch 5 is operated, its contact 5a switches to the side shown by the broken line (the contact 6a of the switch 6 remains on the solid line side), and the drive current to the motor 1 is cut off.
In addition, the lighting current to the indicator lamp 10 via the diode 11 is also cut off, and the current from the terminal A to the switch 5 is cut off.
Excitation current is supplied to the relay 7 through the relay 7.

As the relay 7 is energized, its contacts 8 open, so that when a positive voltage is applied to the terminal A as described above and the valve is fully open, even if a positive voltage is accidentally applied to the terminal B, the motor There is no possibility that a drive current will be supplied to No. 1.

When the above-mentioned valve is in the fully open state, when the application of the positive voltage to the terminal A is stopped and a positive voltage for driving current is applied to the terminal B instead, the closed-side field winding 3 is applied via the switch 6. A drive current flows to the armature 4, the motor 1 rotates in reverse, the valve is closed, and the diode 11
A lighting current is also supplied to the display lamp 10 via the display lamp 10 .

As the valve is being closed from fully open, the contact 5a of the switch 5 returns to the solid line side.

As mentioned above, when the valve is fully open, the contact 6a of the switch 6 switches to the broken line side (the contact 5 of the switch 5
a remains on the solid line side), the current to the motor 1 and the indicator lamp 10 is cut off, and the excitation current is supplied to the relay 7 to prevent rotation of the motor 1 due to the application of the positive voltage to the terminal A.

In the electric valve operation circuit shown in FIG. 1, the indicator lamp 10 lights up only when the valve is operating (while the motor 1 is rotating), and does not light up when the valve is in the fully open or fully closed position.

For this reason, it is not possible to determine by the indicator lamp 10 whether the valve is in the fully open position or the fully closed position, which impedes remote control of the valve, and when an operational failure occurs in the valve. However, it also had the disadvantage that early detection was difficult.

The present invention eliminates the above-mentioned drawbacks and provides a motor operating state display circuit that can also display the fully open and fully closed positions of the valve.

Hereinafter, an embodiment in which the present invention is applied to an operating circuit of an electric valve will be described in detail with reference to FIG.

In FIG. 2, the same reference numerals as in FIG. 1 indicate the same effects.

Reference numerals 12 and 13 denote diodes for preventing backflow, which are interposed in a path for supplying exciting current to the relay 7 when the contacts 5a and 6a of the switches 5 and 6 are on the broken line side.

Reference numerals 14 and 15 indicate an open position indicator lamp and a closed position indicator lamp, which are connected to terminals C and D of the power connector 9 and are disposed in a control room or the like outside the valve.

In the state shown in FIG. 2, the valve is in an intermediate position between fully open and fully closed.

When a positive voltage for driving is applied to the terminal A of the power connector 9 in this state, the motor 1 rotates in the forward direction and the valve is opened as described above.

While the motor 1 is rotating, no lighting current is supplied to the open position indicator lamp 14 and the closed position indicator lamp 15.

When the valve is fully opened by the rotation of the motor 1, the contact 5a of the switch 5 switches to the dashed line side (the contact 6a of the switch 6 remains on the solid line side) as described above, and the motor 1
At the same time, an excitation current is supplied to the relay 7 via the diode 12, and a lighting current is supplied to the open position indicator lamp 14 via the terminal C.

Next, when a positive voltage for driving is applied to the terminal B instead of the terminal A, the motor 1 rotates in the reverse direction as described above and the valve is closed.

Due to this reverse rotation of the motor 1, the contact 5a of the switch 5
returns to the solid line side, so the open position indicator lamp 14 is off while the motor 1 is rotating in reverse.

When the valve is fully opened due to the reverse rotation of the motor 1, the contact 6a of the switch 6 switches to the dotted line side (the contact 5a of the switch 5 remains on the solid line side) as described above.
, the driving current of the motor 1 is cut off, and an exciting current for the relay 7 is supplied via the diode 13, and a current for lighting the closed position indicator lamp 15 is supplied via the terminal.

In the above embodiment, a DC series motor is used as the motor 1, but other types of motors such as a DC compound motor may also be used.

Furthermore, although single-pole double-throw switches are used as the limit switches 5 and 6, double-pole double-throw switches may also be used.

In FIG. 2, a case has been described in which the valve is opened and closed by the motor 1, but the present invention can also be widely applied to electric actuators that operate reversibly between fixed strokes (both end positions) by the motor.

As described above, the present invention is a reversibly rotatable drive motor having a forward rotating field winding such as the open field winding 2 and a reverse rotating field winding such as the closed field winding 3. 1, a movable member that is driven and moved by the motor 1, such as a valve that is opened and closed by the motor, and one of the movements of the movable member, such as a fully open position and a fully closed position of the valve. Separate switches 5.6 each operated at one end and the other end
and an open position indicator lamp 14 and a closed position indicator lamp 1 to which lighting current is supplied via these switches 5 and 6.
Since the present invention is applied to an electric valve operation circuit, the lamps 14 and 15 indicate the fully open and fully closed positions of the valve. Since this can be confirmed by lighting up, remote control is possible, and there is no need to go to the valve installation location to check the open/close position of the valve as in the past, and early detection of valve abnormalities or failures is possible. In addition to improving the reliability of the system, it can be realized as shown in Fig. 2 by partially changing the internal wiring of the conventional circuit shown in Fig. 1 and adding one diode. The strike can be carried out at the same level as the conventional one.

The present invention is particularly effective when applied to valves for aircraft or space equipment that require high reliability.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional example, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1: Motor, 2: Open field winding, 3: Close field winding, 5
, 6: Switch, 7: Relay, 9: Power connector, 12
．． 13: Diode, 14: Open position indicator lamp, 15:
Closed position indicator lamp.

Claims (1)

[Scope of utility model registration request] A reversibly rotatable drive motor having a forward rotation side field winding and a reverse rotation side field winding, a movable member that is driven by the motor and moves, and one end of the movement of the movable member and the other end of the movement of the movable member. a relay to which an excitation current can be supplied via these switches; and a power connector for supplying direct current power to the relay and the motor; A power supply current is supplied from the connector to the forward rotation side field winding through one of the switches, and a power supply current is supplied from the power supply connector to the reverse rotation side field winding through the other of the switches. The relay is configured such that an exciting current is supplied to the relay when the switch is in a state where the power supply current is cut off to the forward rotation side field winding or the reverse rotation side field winding. None, the power supply current of the motor is cut off by excitation of the relay, and the movable member is provided with one end position indicator lamp and the other end position indicator lamp, and one of the switches The excitation current is supplied to the relay from the one switch and the other switch through separate diodes for backflow prevention, and the excitation current is supplied from the one switch and the other switch, respectively. A lighting current is supplied to the one end position indicator lamp and the other end position indicator lamp, and when the movable member reaches the one end, power is supplied to the forward rotation side field winding. When the current is cut off, the relay is energized, the one end position indicator lamp is lit, and the movable member reaches the other end, the power supply current is supplied to the reverse rotation side field winding. 1. An operating state display circuit characterized in that when the relay is cut off and the relay is energized, the other terminal position display lamp is lit.