JPS60157698A - Gas cut-off valve controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a shutoff system in which a gas leakage signal generated when a gas leakage detector detects a gas leakage is input, and a gas shutoff valve provided in a gas flow path is closed in response to the gas leakage signal. This invention relates to a gas cutoff valve control device that generates a signal.

Generally, in this type of device, if the power supply to the device is cut off, the gas leak detection ability is lost, and even if a gas leak occurs, it will not be possible to detect this and close the gas cutoff valve. For this reason, if the power supply is cut off due to an act of self-harm such as suicide, it could cause a major accident. Therefore, it is common practice to automatically close the shutoff valve when the power supply is cut off for about 5 minutes, for example.

However, in this case, if a power outage lasting longer than 5 minutes occurs, the shutoff valve closes, and in order to use gas, it is necessary to manually restore the shutoff valve.

To eliminate the need for such troublesome operations, supply power to the device via a breaker, and use the auxiliary terminal of the breaker to check whether the power supply was intentionally cut off by opening the breaker. It is possible to detect this and close the shutoff valve after a predetermined time only when the power supply is cut off due to the opening of the breaker.
In this case, if a gas leak occurs during a long power outage while you are away, you cannot deal with it, and therefore, to ensure safety, it is necessary to open the breaker before you are away.

As described above, both of the above two methods have advantages and disadvantages, and it is wise to deal with them according to the user's wishes.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a gas cutoff valve control device configured to easily meet any user's wishes.

Below, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a schematic configuration of a gas leak detector interlocking shutoff system using the gas shutoff valve control device according to the present invention. The illustrated system includes three gas leak detectors 10, a gas cutoff valve 20a of a gas make section 20, a control device 30 according to the present invention, and the like.

When gas leaks, the gas leak detector 10 detects the gas at one-quarter or less of the lower explosive limit, displays a lamp, and outputs a gas leak signal to the ηH+77afl device 30. In addition, the gas leak detector detects an intentional act (self-inflicted act such as suicide) on a part of the sensor and outputs a self-inflicted act signal to the control device 3o.

The control device 30 receives a gas leak signal and a self-inflicted act signal from the gas leak detector 1o, issues an alarm with a buzzer and a lamp in response to the gas leak signal, and outputs a cutoff signal to the gas cutoff valve 20a. Further, the gas cutoff valve 20a can be manually shut off using the manual cutoff switch 30p on the control device 30.

Furthermore, it is also possible to output an external output signal that can be linked with external equipment 0 such as a central monitoring board in an apartment complex or the like. The shutoff valve 2°a receives a shutoff signal from the control device 30, closes the valve 2°a, and outputs a valve close signal for displaying the shutoff valve on the control device 30.

In order to do the above, the control device 3o has a
It has a large number of terminals as shown in FIG.

First, there are nine terminals: three Φ24V terminals 30a and three e terminals 30b that supply power to the three gas leak detectors 10, and three signal terminals 30C that accept input signals from the three gas return detectors 10. are arranged in one row. In addition, three terminals 30d, 30e, 30f are connected to the gas cutoff valve 20a to connect the 3-core cable for signal and Φ, and two terminals for Φ and e are connected to the auxiliary contact of the breaker. Terminals 30g and 30h, and two terminals 30i and 3 for ■ and θ that output a signal according to the input signal from the gas leak detector 10 to the external device 40.
Seven terminals 0j are arranged in a row with a certain distance from the terminals 308 to 30C. Furthermore, a power supply terminal 30k is provided at the bottom for supplying AC 100V power to the device.

As can be seen in Figure 2, the surface of the control device 30 includes a power lamp 30P composed of light emitting diodes, an alarm lamp 30m, a cutoff lamp 30n, and, when turned to the monitoring side, a self-damage lamp in the event of a normal gas leak. A manual switch 3 consisting of a waveform switch that shuts off the gas cutoff valve during an act, etc., and immediately shuts off the cutoff valve when turned to the manual side.
0p is provided, and a control circuit for controlling the above-mentioned operations is housed inside.

By the way, each of the gas leak detectors 10 is operated by being supplied with a DC 24V voltage from the terminals 30a and 30b of the control device 30, and when a gas leak is not detected, the voltage is 6■, and when a gas leak is detected, the voltage is 12■ (gas leak signal). , when a disconnection of the connection wire between the gas sensor section and the Meborya control device 30 is detected, the O
A voltage signal of V (self-injury signal) is generated and applied to the corresponding terminal 30C.

Further, the gas cutoff valve 20a, as shown in FIG.
It has a valve operating circuit 21, a valve interlocking magneto 23, and a reed switch 24 which is turned on and off by the magnet 23, and which is turned on when the valve is opened and turned off when the valve is closed. Valve operation circuit 21, terminals 30d and 30e of the control device 30
Terminals 30d' and 30e' connected to the
and a 20V discrimination circuit 21a that determines when the voltage between the terminals 30d' and 3Qs', which is normally 6V, reaches about 20V, and a 20V discrimination circuit 21a that determines when the voltage between the terminals 30d' and 30e', which is normally 6V, becomes about 20V.
an Ov discrimination circuit 21b that discriminates when it becomes V;
It consists of a valve opening/closing circuit 2IC. The circuit 21C is
Switch element SW1 triggered by the determination of 20V voltage by the 0V determination circuit 21a and the 0V determination circuit 21b
It has a switch element SW2 which is triggered by the OV lightning voltage discrimination by OV lightning voltage, and the valve drive coil
7, apply a current in the direction of the solid arrow to open the valve.
Due to the conduction of SW2, the charge in the capacitor C is discharged,
A small current is passed through the valve drive coil I7 in the direction of the dotted arrow to close the valve.

Note that the 20V OV lightning voltage applied from the control device 30 between the terminals 3Qd' and 30e' provides a trigger for forming the shutoff valve 20a in the closed state and the open state, and is used as a cutoff signal and a valve return signal, respectively. It is applied only for a short time, and at other times 6 is applied between terminals 30d' and 30e'.
A voltage of (2) is applied.

Next, the configuration of the control device 30 will be explained with reference to FIG. 5, in which the same parts as those in FIGS. 2 to 4 are given the same reference numerals.

In the figure, 31 is a detector power supply circuit, which steps down AClooV supplied to the terminal 30k via a breaker (not shown) by a transformer T, rectifies and smoothes the applied AC to obtain DC 24V, and supplies this to the terminal 30a. , 30b to three detectors 10. A short circuit protection circuit 32 protects the power supply circuit 31 from being damaged due to a short circuit between the terminals 30a and 30b.

33 is a power supply circuit that supplies DC power to the control circuit of the device, and the DC obtained by rectifying and smoothing the voltage of the AClooV supplied to the terminal 30k by the transformer T and rectifying and smoothing the supplied AC is indicated by the black arrow. It is supplied from this section to each section in the circuit indicated by the same arrow. This rectified and smoothed DC is made into a constant voltage and is supplied from the part indicated by the white arrow to each part in the circuit indicated by the same arrow.

34 is a hack-up power supply circuit, and has a large-capacity charging capacitor C1 that is charged via a diode D by the rectified and smoothed DC.

The hack-up voltage stored in this capacitor C1 is approximately 6 mm, and is supplied from the part indicated by the single point arrow to each part in the circuit indicated by the same arrow, but the part to which this voltage is supplied is
Manual switch 30p after looV supply runs out
This circuit is necessary for shutting off the valve when the breaker is shut off, or shutting off the valve 5 minutes after the breaker is shut off. Note that the same diode D as above is used to prevent backflow.

35 is a shutoff valve output circuit, in which a switching transistor circuit Q+ connected between the backup power supply 34 and the terminal 30d is turned on and off by a signal applied to its base, and when on, approximately 6V is applied between the terminals 30d and 30e.
outputs a voltage of 0, and sets the voltage between terminals 3oa and 3oe to OV when it is off. This becomes a cutoff signal that closes this OV lightning voltage cutoff valve 20a.

36 is a valve return pulse output circuit, which is turned on and off by a signal from a switching transistor connected between the power supply circuit 31 and the terminal 30d, and when on, the terminal 30d
, 30e outputs a voltage of approximately 20V.

This 20V voltage becomes a valve opening signal.

37 is a gas leak signal discrimination circuit, which determines that there is a gas leak signal when the voltage signal applied from the detector 10 to the terminal 30C is equal to or higher than the discrimination voltage of about 7.5 cm by the Zener diode ZD; Accordingly, the inverter 37
Change the output of a from ■ to L level.

Reference numeral 38 denotes a self-inflicted act signal discrimination circuit, which detects that the voltage signal applied from the detector 10 to the terminal 30C is OV and determines that it is a self-inflicted act signal, and in response, the NAND circuit The output of inverter 38a is changed from L to H level, and the output of inverter 38b is changed from H to L level.

39 is an external device output circuit, and the above discrimination circuit 38
The output of the NAND circuit 38a inside is at L level, the transistor circuit Q3 is turned on, and the transistor circuit Q4 is turned on.
, Q5, a constant voltage of about 6 V is output from the terminals 30i and 30j through the transistor circuit Q3. When determining the self-inflicted act signal, the output of the Nantes gate 38a written in - is at the II level and the transistor circuit Q3 is turned off.
The output voltages of i and 30j are OV. When the gas leak signal is determined, the output of the inverter 31a becomes L level and the transistor circuit Q3 is turned on, so the approximately 12V voltage applied to the terminal 30C at this time is directly output from the terminals 30i and 30j through the transistor circuit Q3. be done.

40 is a buzzer drive circuit; 41 is a buzzer driven by the circuit; circuit 40 is connected to circuit 3 when determining a gas leak signal;
When the output of inverter 37a of No. 7 becomes L level, the internal oscillation circuit oscillates, causing buzzer 41 to sound.

42 is a power supply interruption detection circuit, and when the power supply to the device is cut off due to a power outage or a breaker tripping, the inverter 42
The output of a goes from L to f (level).

43 is a breaker disconnection detection circuit, and when the auxiliary terminal 22 (on when the breaker is on) of the breaker that supplies power to the device is connected between terminals 30g and 30h as shown by the dotted line, the auxiliary terminal 44 is on, the output of the inverter 42a is grounded, and the function of the circuit 42 is disabled.

Then, by turning off the auxiliary terminal 44, the capacitor C2 is charged by the Hasokua knob power supply, and the output of the inverter 43a changes from I to L level.

When the auxiliary terminal 44 is not connected to the terminals 30'g and 30h, the inverter 42a is
Since the output of inverter 43a becomes H level, the output of inverter 43a changes from 1■ to L level accordingly.

45 is a 60 second delay circuit, and either the circuit 37 determines a gas leak signal and the output of the inverter 37a changes from ■ to L level, or the circuit 38 determines a self-inflicted act signal and the inverter 38b When the output goes from H to L level, the output of inverter 45a goes from L to H level, which causes capacitor C3 to connect to resistors R1 and R.
It is charged through 1 through 2. When the charge level of capacitor c3 exceeds a predetermined value, programmable unijunction transistor circuit T1 turns on and rapidly discharges the charge of capacitor C3 through resistor R2, thereby causing PUT
I turns off again. At this time, the output of inverter 4.5b goes from J (to L level) due to PUTI being turned on.
When PUTI is turned off, it becomes L level and outputs an L level pulse.

Then, when PUTI is turned off, capacitor c3 is charged again, but the time constant by R+, R2, and C3 is set so that it takes about 40 seconds until PUTI is turned on again, and capacitor c3 is no longer charged. Until then, one L level pulse is generated at the output of inverter 45b approximately every 40 seconds.

46 is monostable multi-by-break (one-shot circuit)
46a, and the inverter 45 is connected to the trigger input of the one-shot circuit 46a.
By applying a pulse of level I generated to the output of a, the output which is normally at H level becomes L level at a certain time, and this is inverted by the inverter 4.6 b and becomes H level level. Output as a pulse. The output of this pulse generating circuit 46 is connected to the base of the transistor circuit Q1 of the cutoff valve output circuit 35, and turns off the transistor circuit Q1 while the H level pulse continues. Due to this,
Terminal 30d.

During the pulse period, the voltage applied from 30e to the shutoff valve 20a becomes 6 oV and returns to 6V again.

Reference numeral 47 designates an answerback circuit, to which the terminal 30f of the reed switch 24 of the cutoff valve 20a is connected as shown by the dotted line. The reed switch 24 is on when the cutoff valve 20a is open, but the OV from the cutoff valve output circuit 35
When the cutoff valve 20a closes due to the application of voltage, it is turned off.

When reed switch 24 turns off, inverter 4.7
The output of a changes from H level to L level.

The output of this inverter 47a is connected via a diode D to a connection point between resistors R1 and R2 of a circuit 45. Therefore, the output of inverter 4.78 is I,
When the voltage reaches the level, the capacitor C3 is no longer charged, an L level pulse is no longer generated at the output of the inverter 45b, and the one-shot circuit 46a is no longer triggered.

By the way, the answer hack circuit 47 has a leet switch 24.
If the line connecting the # is disconnected for some reason, the output of the inverter 47a will be 1. even if the valve 20a is open, just as if the valve were closed. level. Therefore, even if a gas leak or self-damage signal is determined, the capacitor C3 will not be charged. In this case, since the L level of the output of the inverter 47a is applied to one input of the NAND circuit 46C, the other input of the NAND circuit 46C is applied in accordance with the H level of the output of the inverter 45a based on the above signal discrimination. When the output of the inverter 46d connected to the inverter 46d becomes L level, the output of the NAND circuit 46C changes from L to H level, and accordingly, the output of the inverter 4.5b becomes L level.
Level Nonorus will now occur. Therefore, the one-shot circuit 46a is triggered from 1 to 1 by the I level pulse of the filter, and generates an L level pulse at its output. This pulse is inverted and turns off the transistor circuit Q1 for the duration of the pulse, so that it is interrupted only once.
1i signal is now generated.

48 is a 5-minute timer circuit composed of a counter circuit, and the output of the breaker disconnection detection circuit 43 is connected to the reset inputs 1 to 48. While the input level is at the H level, it is in a reset state, and the L When the level is reached, the reset is canceled and the program starts. When the reset input is maintained for 5 minutes, an L level pulse is generated at its output and applied to the 1-rigger input of the one-shot circuit 46a.

Therefore, a cutoff signal can be generated 5 minutes after the power supply is cut off or the breaker is cut off.

49 is a 40 second delay circuit, which creates a 40 second delay for returning the shutoff valve 20a approximately 40 seconds after the gas leak and self-inflicted act signals disappear and the normal state returns. Upon returning to the normal state, the output of the inverter 45a goes from 1] to the L level, and the output of the inverter 46d goes from L to the ■] level, and the transistor circuit Q6 is turned on. As a result, capacitor C3 is charged via resistors R3 and R4, and when the level exceeds a predetermined value after about 40 seconds, PU
T2 turns on. By turning on this PUT2, the H
The output of the inverter 49a, which was at the level, temporarily becomes the L level.

50 is a pulse generation circuit consisting of a one-shot circuit 50a and an impulse circuit 50b. When an L-level pulse is input from the delay circuit 49 to the trigger input of the one-shot circuit, its output remains at H-level for about 2 seconds. A pulse is generated. This pulse is inverted by the inverter 50b, and the transistor circuit Q2 of the valve return pulse output circuit 36 is inverted.
is applied to the base of the transistor circuit Q.
2 turns on for 2 seconds. By this, the terminal 30d,
A valve opening signal of about 20V is supplied to the shutoff valve 20a through the voltage line 30e, and the shutoff valve 20a is opened. By opening this valve 7 6 , the reed switch 24 is turned on again.

51 is a manual cutoff switch circuit, and when the output of the inverter 51a becomes L level by turning off the switch 30p, it is directly applied to the pulse generation circuit 46 through the capacitor C4.

Therefore, when the switch 30p is turned off, a cutoff signal is immediately generated and the cutoff valve 20a is closed.

However, if the valve does not close for some reason, the output of the intake valve 45a is at H level at this time, so the one-shot circuit 46a remains closed until the valve closes.
continues to be triggered. When this switch 30p is returned to its original on state, a valve return pulse is generated in the same manner as in the above case.

52 is an initial reset circuit, one-shot circuit 4.
6a and 50a are reset at the start of energization to prevent unnecessary valve shutoff signals and valve return signals from being generated.

As explained above, according to the present invention, it is possible to determine whether the gas cutoff valve is closed when the power supply is cut off, including when the power supply is cut off due to a power outage, or when the power supply is cut off when the breaker is turned off. Since it can be easily selected according to the user's wishes, it is possible to obtain an apparatus that is highly usable for σL and is advantageous in terms of workability and product cost reduction.

[Brief explanation of drawings]

FIG. 1 is a diagram schematically showing the system using the device according to the present invention, FIG. 2 is a rear view of the device according to the present invention, and FIG. 3 is a circuit diagram of the gas cutoff valve used in the system of FIG. and FIG. 4 are circuit diagrams showing details of the circuit configuration of the device according to the present invention. IO... Gas leak detector, 20a...
Gas cutoff valve, 34...Hack-up power supply, 42
...Power supply disconnection detection circuit, 43...Breaker disconnection detection circuit, 44...Auxiliary terminal, 48.
...Timer circuit.

Claims (1)

[Claims] A cutoff signal generating means generates a cutoff signal to close a gas cutoff valve in response to a gas leakage signal from a gas leak detector; a timer means for generating a timer, and a timer center means for holding the timer means in a reset state while power is being supplied to the device, and setting the timer means in response to interruption of the power supply to the device; A bank-up power supply that keeps all the means in operation even when the power supply to the device is cut off, a circuit that supplies power to the device via a breaker, and an auxiliary terminal for when the breaker is closed. and circuit means for disabling the function of said timer cent means using said gas cutoff valve control device.