JPH0535262Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is an auxiliary operator for a gas cutoff valve with a return safety device, more specifically, the valve is closed by a manual switch or a gas leak alarm, and the valve is opened by a manual switch or a gas leak alarm. For gas cutoff valves that are equipped with a control device that can check whether there is a gas leak on the downstream side when the valve is remotely operated by a reset switch, this system can assist in opening, closing, and checking the valve when control is lost due to a power outage. This relates to an operating device for performing the operation.

[Conventional technology and problems]

Gas leakage can lead to personal injury, so research is underway on gas cutoff valves that automatically cut off the gas supply when a gas leakage occurs. We proposed a gas cutoff valve that opens and closes the main valve body by moving the plunger up and down by energizing a solenoid coil.

In addition, we are currently applying for a control device that can remotely control the gas cutoff valve as described above with a simple structure, detects if the cause of gas leakage on the downstream side has not been resolved, and closes the valve after a set time. Showa 60-
No. 188286, the applicant proposed this, and efforts have been made to improve the safety of gas use.

By the way, the control device uses commercial power as its operating power source, so in the event of a power outage, it will be impossible to open and close the gas cutoff valve, making it impossible to use gas or causing the valve to open and close. A new problem arises in that it cannot be confirmed.

This invention was made in view of the above points, and the purpose is to provide an auxiliary operating device that can open and close a gas cutoff valve even during a power outage.

[Means for solving problems]

In order to solve the above-mentioned problems, this invention provides a connection between the first connection terminal 73 connected to the solenoid coil 6 of the gas cutoff valve 1 and one terminal of the reed switch 9 and the power supply V and the power supply V. A valve closing operation switch 74 for switching the connection is interposed between the second connection terminal 75 connected to the other terminal of the solenoid coil 6 of the gas cutoff valve 1 and the power supply V, and a valve opening operation switch for switching the connection to the power supply V. A relay 78 and a self-holding contact 7 in series therewith are provided between a third connection terminal 77 connected to the other terminal of the reed switch 9 of the gas cutoff valve 1 and one of the power sources V.
9, and further connect this third connection terminal 77 to the power supply V
an opening/closing contact provided on the valve opening operation switch 76 and a detection indicator light 81 connected in series thereto;
A valve close indicator light 83 is connected in parallel with the relay 78 and the self-holding contact 79, respectively, and a valve open indicator light 84 is connected between the first connection terminal 73 and the third connection terminal 77. It is something.

[Effect]

Connecting the first and second connection terminals to both ends of a solenoid coil in the gas cutoff valve, and connecting the third connection terminal to an open/close detection reed switch of the cutoff valve;
When the power is turned on, only the valve open indicator light lights up when the shutoff valve is in the open state.

When you press the valve close operation switch, the power supply energizes the solenoid coil to pull down the plunger.
When the shutoff valve is closed, the reed switch is turned on, the valve closing indicator light is lit, and the valve open indicator light is extinguished, so when the valve closing operation switch is released, the power to the solenoid is cut off.

Next, when you press the valve opening operation switch, the solenoid is energized to pull up the plunger, the plunger rises and the detection indicator light lights up, and if the downstream gas leak has been resolved, the main valve is in the open position. The reed switch turns off, the detection indicator light and valve close indicator light go out, and the open indicator lights up.

If the downstream gas leak conditions are not resolved,
Since the reed switch remains on and the detection indicator light and valve close indicator light do not go out, press the valve closing operation switch to close the shutoff valve.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

5 to 7 show the specific structure and operating state of the gas cutoff valve 1. When the valve is normally opened without gas leakage, the main valve body 2 is opened as shown in FIG.
is pushed up by the spring 3 and kept in the open position where the gap between the upstream side U and the tributary side D of the gas main flow path is fully opened, and the magnetic plunger 4 is also attracted by the permanent magnet 5 and kept in the open position. It can be done.

In this state, when the manual switch for closing the valve is turned on or when the gas leak alarm outputs a signal indicating a gas leak, the solenoid coil 6 is energized in a direction that generates a magnetic force in the opposite direction to the magnetic force of the permanent magnet 5. do. As a result, the plunger 4 is moved by its own weight to the main valve body 2.
As shown in FIG. 6, it closes the auxiliary flow path 7 and pushes the main valve body 2 down to the closed position against the force of the spring 3, thereby preventing the gas flow from the upstream side U to the downstream side D. completely cut off.

A magnet piece 8 is fixed to the lower end of the main valve body 2, and when the main valve body 2 is pushed down to the closed position, the magnetic force of the magnet piece 8 causes a reed switch 9 to act as a closed position detector. is closed.

In order to return the shutoff valve 1 from the shutoff state shown in FIG. 6 to the fully open state shown in FIG. As shown in FIG. 7, the plunger 4 is attracted upward until it is attracted and held by the permanent magnet 5, that is, to the open position. Even if the plunger 4 returns to this open position, the pressure on the upstream side U of the main valve body 2 is considerably higher than the pressure on the downstream side D, which has decreased due to gas leakage, and this differential pressure is greater than the force of the spring 3. It does not immediately return to the open position and remains in the position shown in Figure 7 for a while. In this way, after the reset signal is generated, while the plunger 4 returns to the open position and the main valve body 2 is maintained in the closed position, the auxiliary flow path 7 is open and gas leaks to the downstream side D. If not, the pressure on the downstream side D will gradually increase due to the gas flowing into the downstream side D from the auxiliary flow path 7, and when the differential pressure with the upstream side U becomes smaller than the spring force of the spring 3, the main valve body 2 is returned to the open position shown in FIG. 5 by the spring force, and the main gas passage is fully opened again. That is, if there is no gas leak, the shutoff valve will return to the open position shortly after the reset operation.

However, in the state shown in FIG. 7, if the gas leak on the downstream side D is not repaired, the differential pressure between the upstream side U and the downstream side D will not become low.
The main valve body 2 does not return to the open position, and the reed switch 9
remains closed. If this continues, the gas will continue to flow to the downstream side D via the auxiliary flow path 7 and continue to flow out from the leakage point, so this invention is equipped with a timer circuit that starts when the reset switch is turned on, and after a set time, the main When the closed position detector of the valve body 2, that is, the reed switch 9 does not turn off, the solenoid coil 6 is moved in the direction that generates magnetic force in the opposite direction to the magnetic force of the permanent magnet 5, just as when the manual valve close switch is turned on. By energizing the plunger 4, the plunger 4 is moved again to the closed position shown in FIG. 6, thereby safely blocking the gas flow from the upstream side U to the downstream side D. In other words, in the shutoff valve with a return safety device of this invention, even if a reset operation is performed after the valve is in the closed state, the shutoff valve will not return to the open position unless the gas leak has been repaired. . In other words, the shutoff valve is returned to the open position only after it is confirmed that the gas leak has been restored by the reset operation.

The electric circuit in Figure 8 shows a combination of the main control circuit, alarm circuit, and gas tank open/close display circuit,
The main control circuit includes an indicator circuit 1 in which a diode 11 and a circuit breakage power failure indicator light 12 are connected in series between the secondary side of the AC transformer T and the reed switch 9, and a diode 14 is connected in parallel with the reed switch 9.
5 and a diode 16 in series with the reed switch 9.
and the relay circuit 17 in which the and relay R are connected, the manual valve-closing circuit 21 in which the solenoid coil 6 is connected in series with the diode 18, the manual valve-closing switch 19, the resistor, and the relay contact _R2 , and the secondary side of the transformer T. The diode 22, relay contact _R1 , timer circuit 23, and relay R2 are connected in series to the reset circuit ₂₅ , which connects the reset switch 24 for starting to the timer circuit 23, and the manual valve closing circuit 21. A reset power supply circuit 26 that is connected in parallel with the solenoid coil 6 and has a capacitor C ₁ and relay contacts R ₁ and R ₂ arranged in series, which serves as a power supply for energizing the solenoid coil 6 in the direction of pulling down the plunger 4, and this power supply. It is composed of a charging circuit 27 for the capacitor _C1 of the circuit 26.

A relay contact _R1 and a valve open indicator light 28 are inserted into the reset circuit 25, and a gas leak detection indicator light 29 is connected in parallel to the relay _R2 .

The alarm circuit has a thyristor 31 and a relay contact _R1 connected in series before and after the diode 18 and the valve closing switch 19 of the manual valve closing circuit 21,
When the alarm output reaches H level, thyristor 31
The solenoid coil 6 is energized to cause the plunger 4 to be pulled down when the alarm detects a gas leak.

The open/close display circuit for the gas tank 41 has a diode 43 connected in parallel to a switch 42 which serves as a gas tank closed position detector, a circuit indicator light 44 and a diode 45 at one terminal of the switch 42, and an open/close indicator light at the other terminal of the switch 42. 46 and a diode 47 are connected respectively, and when the switch 41 is open, the switch 42 is turned on and the open/close indicator light 46 is lit.

Relay contact R ₁ in the reset circuit 25
An on-off switch 51 interlocked with the manual valve-closing switch 19 is interposed between the manual valve-closing switch 19 and the reset switch 24 to prevent malfunction of the timer circuit 23 when the manual valve-closing switch 19 and reset switch 24 are pressed at the same time. That's what I do.

Furthermore, jack-type connection contacts 52, 53, and 54 are connected to both ends of the solenoid 6 and one end of the reed switch 9 in the cutoff valve 1.

In addition, the drawing shows an example in which the gas cocks have a control structure that is substantially the same as that of the shutoff valve 1, and the open/close display circuits of the gas cocks are arranged in parallel as many gas cocks as there are gas cocks, and the central operating device 61 shown in FIG. The indicator lights 44 and 46 of each gas tank 41, the indicator light 12 of the shutoff valve 1, the valve open indicator light 28, and the gas leak detection indicator light 2
9, a manual valve close switch 19, and a reset switch 2 are arranged, and furthermore, the connection parts of the reinforcing operation device 71, that is, the connection contacts 52, 53, 54, which control the opening and closing of the slide valve 1 in the event of a power outage are housed. ing.

The structure and operation of the above-mentioned main control circuit are detailed in U.S. Pat.

FIG. 1 shows the circuit structure of the auxiliary operating device 71 that controls the shutoff valve 1 during a power outage, and FIGS.
The figure shows its operating state.

The auxiliary operation device 71 includes a power switch 72 interposed between a power supply V and a capacitor C connected in parallel to the power supply V, and a valve closing operation switch 74 between a first connection terminal 73 connected to the contact 52 and the power supply V. A valve opening operation switch 76 is provided between the second connection terminal 75 connected to the contact 53 and the power supply V. The valve opening operation switch 76 is provided with opening/closing contacts as shown.

The third connection terminal 77 connected to the contact 54 and the power supply V
A relay 78 and a self-holding contact 79 connected in series thereto, a resistor 80 and a detection indicator light 81 and an opening/closing contact of a valve open operation switch 76 connected in series thereto, a resistor 82 and a valve close indicator light 83, Each set is connected in parallel, and furthermore, the relay 78 and the contact 79 are connected, and the detection indicator light 81 and the opening/closing contact of the valve opening operation switch 76 are connected.

A valve opening indicator light 84 and a resistor 85 are connected in series between the first connection terminal 73 and the third connection terminal 77.

The auxiliary operating device 71 has the above-described configuration and is used to open and close the cutoff valve 1 during a power outage.The jack 86 of the auxiliary operating device 71 is inserted into the connection provided on the central operating device 61. , each connection contact 52, 53, 54 and terminal 7 as shown in FIG.
Connect 3, 75, and 77.

(When the valve is open) When the power switch 72 is turned on, a current flows as shown by the broken line in FIG.
Only 4 is lit, indicating that the shutoff valve 1 is in the open state.

(Valve Closing Operation) To close the shutoff valve 1, the valve closing operation switch 74 can be pushed as shown by the arrow in FIG. A current flows that causes excitation in the opposite direction, and the plunger is pulled down to close the shutoff valve 1. At the same time, the reed switch 9 detects the closing of the main valve element and turns on, so that the solenoid coil is activated as shown by the broken line in the figure. The positive current passing through the reed switch 9 also flows through the reed switch 9, and the current passing through the reed switch 9 energizes the valve close indicator light 83, lighting it up to indicate the valve closed state. After that, as shown in FIG. 2B, when the pressure on the valve-closing switch 74 is released, the power to the solenoid coil 6 is cut off, but the reed switch 9 and the valve-closing indicator light 83 are energized via the valve-closing switch 74. The valve closing indicator light 83 remains lit.

(Valve opening operation) To open the valve from the above-mentioned closed state, it is sufficient to press the valve opening operation switch 76 as shown in Fig. 3, and when the plunger is pulled up to the solenoid 6 as shown by the two-dot chain line in the same figure, electricity is energized. If the gas leakage on the downstream side of the shutoff valve 1 has been eliminated, the main valve element will rise and open, which will turn off the reed switch 9 and turn off the valve close indicator light 83. When the valve-opening indicator lamp 84 is turned off, the light goes out, and at the same time, the valve open indicator lamp 84 is energized and turns on. When the pressure on the valve opening operation switch 76 is released, the power to the solenoid coil 6 is cut off.
It will look like Figure 1.

Furthermore, if gas leakage has not been eliminated on the downstream side of the shutoff valve 1, the main valve body will not rise and the reed switch 9 will remain on, and at the same time as the valve opening operation switch 76 is pressed, the reed switch 9 will be turned on.
6 closes, the self-holding contact 79 closes when the relay 78 is energized, the detection indicator light 81 lights up, and even if the pressure on the valve opening operation switch 76 is released and the energization to the solenoid coil 6 is cut off, the above-mentioned This state is maintained, and the valve closing indicator light 83 is also turned on by energization as shown by the broken line in FIG.

If the detection indicator light 81 does not turn off and the valve is not opened even after waiting for a suitable period of time, press the valve closing operation switch 74 as shown in FIG. 4 to close the solenoid coil 6.
Then, the plunger is pulled down and energized as shown by the dashed line in the figure, and the plunger closes the auxiliary flow path of the main valve body, keeping the valve closed during detection.

When the valve closing operation switch 74 is pressed, the circuit shown by the two-dot chain line in FIG.
1 also goes out.

Even while the valve closing operation switch 74 is being pressed, as shown by the chain line in FIG. This is lit.

Therefore, if the shutoff valve 1 cannot be opened,
All you have to do is eliminate the cause of the gas leak.

〔effect〕

As described above, according to this invention, the gas cutoff valve with a complete return device can be opened and closed even during a power outage, and the safety of gas use can be greatly improved.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of the auxiliary operation unit according to this invention.
Each of FIGS. 2 to 4 is a circuit diagram showing the operating state of the above, FIGS. 5 to 7 are sectional views showing the operation of the gas cutoff piece, and FIG. 8 is a control circuit diagram of the gas cutoff valve.
FIG. 9 is a front view showing the central operating device and the auxiliary operating device. 1...Gas cutoff valve, 71...Auxiliary operation section, 73
...First connection terminal, 74...Valve closing operation switch,
75...Second connection terminal, 76...Valve opening operation switch, 77...Third connection terminal, 78...Relay, 7
9...Contact, 81...Detection indicator light, 83...Valve close indicator light, 84...Valve open indicator light.

Claims (1)

[Claims for Utility Model Registration] The main valve body 2, which opens and closes the main gas passage, is elastically biased to rise to the valve open position by a spring 3, so that it can freely move up and down directly above the main valve body 2, and when it descends, the main valve body A magnetic plunger 4 is disposed to push down the main valve body 2 to the closed position, and a permanent magnet 5 is provided directly above the magnetic plunger 4 to attract the magnetic plunger 4 to the raised position and bring the main valve body 2 to the open position. On the outside of plunger 4,
A solenoid coil 6 that detaches and lowers the magnetic plunger 4 from the permanent magnet 5 by excitation in a direction opposite to the magnetic force of the permanent magnet, and pulls the magnetic plunger 4 to a raised position by excitation in the same direction as the magnetic force of the permanent magnet.
In the gas cutoff valve 1, which is formed by arranging the reed switch 9, which detects the closed state of the main body 2, is connected to one terminal of the solenoid coil 6 of the gas cutoff valve 1 and one terminal of the reed switch 9, respectively. A valve closing operation switch 74 for switching the connection to the power supply V is interposed between the first connection terminal 73 and the power supply V, and a second connection terminal 75 is connected to the other terminal of the solenoid coil 6 of the gas cutoff valve 1. A valve opening operation switch 76 is provided between the power supply V and the third connection terminal 77 connected to the other terminal of the reed switch 9 of the gas cutoff valve 1, and a relay is connected between one side of the power supply V. 78 and self-holding contact 7 in series therewith.
9, and further connect this third connection terminal 77 to the power supply V
an opening/closing contact provided on the valve opening operation switch 76 and a detection indicator light 81 connected in series therewith;
A valve close indicator light 83 is connected in parallel with the relay 78 and the self-holding contact 79, respectively, and a valve open indicator light 84 is connected between the first connection terminal 73 and the third connection terminal 77. An auxiliary operator for gas cutoff valves with a return safety device.