JPH0636366Y2 - Drive device for gas shutoff valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a gas cutoff drive device for driving a gas cutoff valve in a gas pipe, and in particular, the gas cutoff valve is closed or opened by the discharge current of a capacitor. The device.

[Conventional technology]

A conventional gas cutoff valve drive device is configured as shown in FIG. In the figure, A is an operating device, which is for opening and closing the gas cutoff valve 1 located away from the operating device A.

The controller A has a power supply circuit 2 whose output is connected to a parallel circuit of a capacitor C ₁ and a zener diode ZD ₅ via a diode D ₆ and a resistor R ₁₁ and also via a diode D _7. Connected to capacitor C ₂ . The capacitor C ₁ is charged through the resistor R ₁₁ , its charging voltage is limited by the Zener diode ZD ₅ , and the capacitor C ₂ is directly charged without passing through the resistor, and the charging level is the capacitor C ₁
It is designed to be higher than.

NPN transistors Q ₆ and Q ₇ are connected in series between the connection point of resistor R ₁₁ and capacitor C ₁ and ground, and NPN transistors Q ₈ and Q ₉ are connected between the connection point of diode D ₇ and capacitor C ₂ and ground.
Are directly connected. The connection point X between the emitter of the transistor Q _{6 and} the collector of the transistor Q ₇ and the connection point Y between the emitter of the transistor Q _{8 and} the collector of the transistor Q ₉ are introduced from the operator A to the gas cutoff valve 1. A solenoid coil L ₁ as a valve driving source for driving the valve is connected between them. Above transistor
Q _6, Q _7, the collector of Q _8, Q ₉ and between the base and the light receiving portion of the photocoupler _{(phototransistor) Q P3, Q P4, Q} P5, Q P6 is connected, the light-receiving unit corresponding When light is received from the photodiodes D _P3 , D _P4 , D _P5 , D _P6 and turned on,
The corresponding transistor is now conducting.

Each light-emitting portion is constituted by a photodiode, a photodiode D _P3, D _P6 through each resistor between the collector of the power supply V _CC and the transistor Q _3, a photodiode D _P4, D _P5
Are respectively connected via resistors to the power supply V _CC and the collector of the transistor Q ₄ . The transistor Q ₃ is turned on by a signal from the gas sensor, a pulsed shutoff signal generated in a circuit (not shown) at the time of power shutoff or valve shutoff in response to a manual operation is applied to the base. Photodiode D _P3 , D _P6
Is turned on, and the transistor Q ₄ is turned on by applying a pulsed return signal generated in a circuit (not shown) to the base at the time of power failure recovery or valve recovery performed in response to a manual operation. Turn on the photodiodes D _P4 and D _P5 .

Between the power supply V _CC and the connection point X, a diode D ₅ and a resistor R
₃ is inserted in series, and the connection point Y is connected to the capacitor C ₃ via the resistor R ₄ and further connected to the base of the NPN transistor Q ₅ via the resistor R ₅ . The collector of the transistor Q _5, the display circuit does not perform display during ON of the transistor Q ₅ for displaying the off 5
It is connected to the. The resistor R ₆ connected in parallel with the capacitor C ₃ is for discharging.

Further, the power supply V _CC can be normally supplied from the power supply circuit 2, but in case of a power failure, it is supplied from a backup power supply composed of a capacitor (not shown).

In the above configuration, when the shutoff signal is input when the gas shutoff valve 1 is in the return position to open the valve, the transistor D ₃ is turned on, the photodiodes D _P3 and D _P6 are turned on, and the photodiode D _P3 , The light from D _P6 is the phototransistor Q _P3 , Q
By being received by _P6, the transistor Q _6, Q ₉ is turned on. When the transistors Q ₆ and Q ₉ are turned on, the charge stored in the capacitor C ₁ is discharged through the transistor Q ₆ , the coil L ₁ and the transistor Q ₉ , and a discharge current flows in the coil L ₁ in the direction of the solid line arrow. The magnetic field generated by the energization of this coil L ₁ cancels the magnetic field of the magnet holding the valve in the return position, whereby the valve is moved by the urging force applied to the valve in the valve closing direction and the valve is moved. Closes.

Further, when the return signal is input when the gas shutoff valve 1 is in the shutoff position, the transistor Q ₄ is turned on and the photodiodes D _P4 and D _P5 are turned on, and the photodiodes D _P4 and D _P4 , D
_The phototransistors Q _P4 and Q _P5 receiving the light from _P5 turn on the transistors Q ₇ and Q ₈ . This transistor Q
By turning on the _7, Q _8, charges stored in the capacitor C ₂ is the transistor Q _8, a coil L _1, is discharged through the transistor Q _7, a discharge current flows in the dotted arrow direction in coil L _1. The magnetic field generated by energizing this coil L ₁ is
In cooperation with the magnetic field of the magnet, it is moved by suction against the biasing force at the blocking position to open.

Normally, the diode D ₅ weak current so as not to operate the valve from the power supply V _CC, resistor R _3, the coil L _1, resistors R _4, R _5, and flowing through R ₅ transistor Q ₅ is turned on, The display circuit 5 does not display anything, but if the lead wire from the operating device A to the gas cutoff valve 1 is disconnected when an abnormality occurs, the above current stops flowing and the transistor Q ₅ turns off. When the transistor Q ₅ is turned off, the display circuit 5 makes a display to inform that the lead wire is broken. When the lead wire is broken, the valve cannot be opened / closed by the operation of the operation unit A, and therefore the valve may be closed by a manual device by the notification of the display circuit 5.

[Problems to be solved by the invention]

In the such a conventional configuration, simultaneously to turn on the transistors Q ₆ and Q ₉ when closing the gas shutoff valve 1 in the valve opening state. Further, when the gas shutoff valve 1 in the valve closed state is opened, the transistors Q ₇ and Q ₈ are turned on at the same time so that the positive and negative electric powers are supplied to the solenoid coil L ₁ , respectively. Therefore, two transistors are required for each current to flow in the solenoid coil L _1, and accordingly two photodiodes D _{P3 to} D _P6 and two photo transistors Q _{P3 to} Q _P6 are also required, which complicates the configuration. The cost will also increase.

[Means for solving problems]

The present invention has been made in view of the above-mentioned conventional problems. As shown in FIG. 1, the gas shutoff valve 1 is closed by passing currents in opposite directions to the gas shutoff valve 1. And a gas shut-off valve driving device for opening the valve, the power supply circuit 2 supplying positive and negative DC voltage, and first and second capacitors charged by the positive and negative DC voltage from the power supply circuit 2.
C ₁ and C _2, and first and second switching elements 3 and 4 connected in series between the first and _second capacitors C ₁ and C ₂ and the gas cutoff valve 1, respectively, By turning on one of the first or second switching elements 3 and 4, the first or second switching element 3 or 4 is turned on.
Alternatively, the charge charged in the _second capacitors C ₁ and C ₂ may be the first or the second.
The switching elements 3 and 4 and the gas cutoff valve 1 are caused to discharge in opposite directions, and the gas cutoff valve is closed and opened by the discharge current.

[Action]

In the above configuration, the power supply circuit 2 charges the first and second capacitors C ₁ and C ₂ in opposite polarities with respect to the gas cutoff valve 1. When closing the gas cutoff valve 1 in the valve open state, the first switching element 3 is turned on to discharge the charged charge of the first capacitor C ₁ through the first switching element 3 and the gas cutoff valve 1. Therefore the first capacitor
The discharge current of C ₁ flows as shown by the solid line in the figure. On the other hand, when the gas shutoff valve 1 in the valve closed state is opened, the second switching element 3 is turned on to discharge the electric charge charged in the second capacitor C ₂ through the second switching element 4 and the gas shutoff valve 1. Since the charge polarity of the _second capacitor C ₂ with respect to the gas cutoff valve 1 is opposite to the charge polarity of the first capacitor C ₁ , its discharge current is the discharge current of the first capacitor C ₂ as shown by the dotted line in the figure. Flow in opposite directions to each other.

As described above, the valve closing and opening operations of the gas cutoff valve 1 are performed.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 2, the same parts as those in FIGS. 1 and 4 are designated by the same reference numerals. In the operating device A, 2 is a power supply circuit that supplies positive and negative DC voltages, and an AC power supply is provided on the primary side of the power transformer T.
AC is connected, and diodes D ₁ and D ₂ are connected in opposite directions to one end on the secondary side, and anodes and cathodes of stabilizing zener diodes ZD ₁ and ZD ₂ are connected through resistors R ₁ and R ₂ , respectively. To be done. The the secondary side of the other end of the transformer T is connected a zener diode ZD _1, ZD ₂ of the cathode and the anode, positive and negative DC voltage is supplied from both ends of the Zener diode ZD _1, ZD _2. Zener diode ZD _1, the ZD capacitor C ₁ each of the first and second at both ends of the _2, C ₂ are connected a power supply circuit 2 of the capacitor C _1, the Zener diode ZD ₁ of C _2, ZD ₂ cathode terminal Is charged to a positive voltage. This charging voltage is Zener diode ZD ₁ , ZD ₂
Limited by The first switching element 3 and the backflow prevention diode D ₃ are connected in series between the first capacitor C ₁ and the solenoid coil L ₁ of the gas cutoff valve 1. The switching element 3 is composed of a phototransistor Q _P1 which is a light receiving portion of a photocoupler and an NPN transistor Q ₁ connected to the output terminal of the phototransistor Q _P1 as in _FIG . Similarly, a second switching element 4 and a backflow prevention diode D ₄ are connected in series between the second capacitor C ₂ and the solenoid coil L ₁ , and the switching element 4 is composed of a phototransistor Q _P2 and an NPN transistor Q ₂ . Composed.

Photodiodes D _P1 and D _P2 , which are corresponding light emitting units, are optically coupled to the phototransistors Q _P1 and Q _P2 . Each photodiode D _P1 , D _P2 is a transistor Q ₃ ,
It is connected between the collector of Q ₄ and the power supply V _CC , and transistor Q ₃ ,
A shutoff signal and a return signal for closing and opening the gas shutoff valve 1 are supplied to the base of Q ₄ . Also, as in FIG. 4, a small current is made to flow from the power source V _CC to the solenoid L ₁ through the diode D ₅ and the resistor R ₃ , and the transistor Q ₅ is turned on by the resistors R ₄ , R ₅ , and R ₆ , and the display circuit 5 displays. I try not to be.

In such a configuration, when the cutoff signal is input when the gas cutoff valve 1 is in the valve open return position, the transistor Q ₃ is turned on and the photodiode D _P1 is turned on. This lighting turns on the corresponding phototransistor Q _{P1 and} turns on the transistor Q ₁ . As a result, the charged electric charge of the first capacitor C ₁ flows through the transistor Q ₁ and the diode D ₃ to the solenoid coil L ₁ in the direction of the solid line in the figure to close the gas cutoff valve 1.

On the other hand when opening the gas shut-off valve 1 which is in the valve closed state to supply a return signal to the transistor Q ₄ to turn on the photodiode D _P2 to turn on the transistor Q _4. This lighting turns on the phototransistor Q _{P2 and} turns on the transistor Q ₂ . Therefore, the charge of the second capacitor C ₂ is discharged through the transistor Q ₂ , the diode D ₄ and the solenoid coil L ₁ , and the discharge current flows in the direction of the dotted line in the figure to open the gas cutoff valve 1. The discharge currents of the capacitors C ₁ and C ₂ flow in the opposite directions as described above. Each capacitor C ₁ , C
_When the discharge of ₂ is completed and the cutoff and return signals are not input and the transistors Q ₁ and Q ₂ are turned off, the capacitors C ₁ and C ₂
Is recharged by the power supply circuit 2.

Normally the solenoid coil L ₁ diode D ₅ from the small current power supply V _CC to the extent that does not work, the resistance R _3, and flows through the solenoid coil L _1, resistors _{R 4, R 5, R 6} , transistor Q ₅ is It is on. As a result, the display circuit 5 does not perform any display, but if the lead wire from the operating device A to the gas cutoff valve 1 is disconnected when an abnormality occurs, the above current does not flow, and the transistor Q ₅ is turned off. Indicates the disconnection state, and the operator sends a cut-off signal or a return signal to the transistor Q ₃ and
Input to Q ₄ for opening and closing the gas shutoff valve 1. Even conducting again after disconnection of the lead wire, the voltage of the capacitor C ₃ is turned off the transistor Q ₅ to stand amounts to a predetermined voltage, causes the display circuit 5 for a predetermined time period displayed.

FIG. 3 shows another embodiment of the power supply circuit 2 shown in FIG. ₂ , in which positive and negative rectified outputs by the diodes D ₁ and D ₂ are passed through constant voltage circuits 6 and 7 to obtain first and second capacitors C ₁ and C _2. Is supplied to. Each constant voltage circuit 6 and 7 consists of capacitors C ₁ and C ₂ and a diode.
Between control transistors Q ₆ and Q ₇ connected in series between D ₁ and D ₂ , resistors R ₇ and R ₈ connected between their collectors and bases, and between the other end of the secondary side of transformer T and the base. It is composed of connected Zener diodes ZD ₃ and ZD ₄ . The constant voltage circuits 6 and 7 have a well-known configuration, and the description of the operation is omitted. still,
Resistors R ₉ and R ₁₀ for current limiting are connected to the emitter sides of the control transistors Q ₆ and Q ₇ .

In such a configuration, the positive and negative half-wave rectified voltages rectified by the diodes D ₁ and D ₂ are made constant by the constant voltage circuits 6 and 7, and the constant voltage is converted to the first and second capacitors C ₁ and C _2. Supply as charging voltage. Since the resistance values of the current limiting resistors R ₉ and R ₁₀ can be reduced by the constant voltage circuits 6 and 7, the charging time for the capacitors C ₁ and C ₂ can be shortened.

〔effect〕

As described above, according to the present invention, one switching element for controlling the discharge currents of the first and second capacitors with respect to the gas cutoff valve can be configured respectively, so that the configuration is simplified and the cost is reduced. You can

[Brief description of drawings]

1 is a diagram showing the principle of the present invention, FIG. 2 is a circuit diagram showing an embodiment of the device according to the present invention, FIG. 3 is a circuit diagram showing another embodiment of the power supply circuit according to the present invention, FIG. 4 is a circuit showing a conventional configuration. 1 ... Gas cutoff valve, 2 ... Power supply circuit, 3 ... First switching element, 4 ... Second switching element, 5 ...
Display circuit, 6,7 ... Constant voltage circuit, A ... Operator, T ...
Power transformer, Q _P1,, Q _P2 …… Phototransistor, D _P1,, D
_P2 …… Photodiode, C ₁ …… First capacitor, C ₂
...... Second capacitor.

Claims (1)

[Scope of utility model registration request] 1. A gas cutoff valve drive device for closing and opening the gas cutoff valve by applying currents in opposite directions to the gas cutoff valve, the power supply circuit supplying positive and negative DC voltages. , First and second capacitors charged by positive and negative DC voltages from the power supply circuit, and first and second capacitors connected in series between the first and second capacitors and the gas cutoff valve, respectively. A switching element, and by turning on one of the first or second switching element, charges charged in the first or second capacitor are reversed from each other through the first or second switching element and the gas cutoff valve. A gas shutoff valve driving device, characterized in that the gas shutoff valve is closed and opened by the discharge current in the direction.