JPH0322535B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas switching device for gas appliances.

Conventionally, gas cookers have been widely used as a means to open and close the gas supply to gas appliances such as gas stoves, but since such gas cookers open and close the gas by rotating a knob, they do not require electricity. The problem was that it was more cumbersome to operate than a switch. The present invention has been made in view of these points, and allows the gas supply to be started by operating a switch, and the gas supply to be cut off by operating the switch again. To provide a gas opening/closing device for a gas appliance which can automatically shut off the gas flow when the gas goes out and can drive a valve to close with a small drive current and has a simple structure.

The configuration of the present invention will be described below with reference to illustrated embodiments. Fig. 1 is a partial vertical sectional view showing a gas development mechanism in an embodiment of the present invention, Fig. 2 is a partially enlarged longitudinal sectional view of the same, and Fig. 3 is an electric circuit used in the gas opening/closing mechanism of the same. FIG. In FIG. 1, 1 is a valve body connected between a gas tank 2 and a gas appliance (not shown), and a valve mechanism chamber 6 is provided in the middle of gas flow paths 4 and 5. One gas flow path 4 is provided with a connection part made of a rubber pipe 3 that is connected to a gas tank, and the other gas flow path 5 is connected to a gas hose or the like that connects to a gas appliance (not shown). be. A pipe 7 is provided within the valve mechanism chamber 6 and is movable in a direction substantially perpendicular to the gas channels 4 and 5, and whose axial direction is substantially the same as the gas channels 4 and 5. A pawl valve 8 is loosely fitted into the pipe 7, and this pawl valve 8 is connected to the pipe 7.
It is biased toward the gas flow path 5 by a spring 9 provided therein. Inside the valve mechanism chamber 6, the pawl valve 8 is installed.
A valve seat 10 is provided, which has a shape that allows the valve to come into close contact with the valve seat 10 and which is connected to the gas flow path 5 on the gas appliance side (not shown). The opening surface of this valve seat 10 is slightly inclined with respect to the direction of the gas flow paths 4 and 5. An electromagnetic operation section consisting of an electromagnetic coil 11, a fixed iron core 12, and a movable permanent magnet 13 is provided on the upper part of the valve body 1. A movable permanent magnet 13 of the electromagnetic operation section is connected to the pipe 7 via a spring 14.
By moving up and down, the pipe 7 can be moved up and down. 15 is a spring;
The pipe 7 is urged downward. The strength of the spring 15 is such that when the electromagnetic coil 11 generates magnetic flux in a direction that repulses the movable permanent magnet 13, the attractive force between the movable permanent magnet 13 and the fixed iron core 12 becomes lower than the biasing force of the spring 15. I'm starting to do that. Further, when the electromagnetic coil 11 is de-energized or excited to generate a magnetic flux in a direction that attracts the movable permanent magnet 13, the attractive force between the movable permanent magnet 13 and the fixed iron core 12 is applied to the spring 1.
The strength of the spring 15 is set so that it becomes stronger than the biasing force of the spring 15 and moves the pipe 7 in the valve closing direction. A valve seat 16 is provided at the bottom of the valve body 1 and forms a small-diameter valve opening that communicates the valve mechanism chamber 6 with the outside air. Manual button 1
It is formed integrally with 8. Further, this valve 17 is urged in the valve closing direction by a spring 19.

The gas opening/closing mechanism configured as described above first moves the electromagnetic coil 1 in a direction that attracts the movable permanent magnet 13.
When power is applied to 1, the movable permanent magnet 13 and the fixed iron core 1
The attractive force between the movable permanent magnet 13 and the fixed iron core 12 increases, and the movable permanent magnet 13 moves against the biasing force of the spring 15.
The interlocking pipe 7 guides the ball valve 8 to the position of the valve seat 10, and the spring 9 in the pipe 7 guides the ball valve 8 to a position where it comes into close contact with the valve seat 10, and the gas flowing into the valve body 1 The ball valve 8 is pressed against the valve seat 10 by the pressure of the pressure and the force of the spring 9, and the gas is shut off. Further, even if the electromagnetic coil 11 is subsequently de-energized, it remains self-retained by the attractive force of the movable permanent magnet 13, and the gas cutoff state is maintained. Next, when returning the activated ball valve 8, when the electromagnetic coil 11 is energized in a direction that repulses the movable permanent magnet 13, the attractive force between the fixed iron core 12 and the movable permanent magnet 13 is reduced, and the pipe Since the ball valve 7 is pushed downward by the spring 15, the ball valve 8 can be returned to the opening direction.

Next, FIG. 3 shows an electric circuit used to control the gas opening/closing mechanism shown in FIG. 1. In the figure, T is a step-down power transformer, which steps down the commercial power supply voltage and inputs it to the diode bridge DB. The full-wave rectified output of the diode bridge DB is
Smoothed by capacitor C ₁ , stabilized power supply circuit A
The voltage is made constant by the capacitor C2 and stored in the capacitor _C2 . The charging voltage of the capacitor _C2 lights up the green LED 20 for power display.
The push button switch 21 is a normally open switch that is pressed when igniting and extinguishing a gas appliance, and one end of the switch is connected to the output of the inverter I ₁ via a diode D ₁ . When the gas appliance is not lit, the output of inverter _I1 is at L level,
Therefore, when the push button switch 21 is turned on in this state, the voltage at the connection point between the resistor _R1 and the capacitor _C3 instantaneously drops to the L level. For this reason, the timer IC
The trigger terminal of 22 becomes L level, and the timer
A falling trigger is applied to IC22. This timer IC22 is, for example, NEC's μPC1555 or Mitsubishi's
It consists of a general-purpose IC such as the M51841P, and when the voltage at the trigger terminal becomes one-third or less of the power supply voltage Vcc applied to the terminal, the falling trigger starts the timer operation. The output terminal becomes H level when the timer IC 22 is triggered, and returns to L level when the timer operation ends. Further, the threshold terminal is used to terminate the timer operation when the voltage of the capacitor _C4 becomes two-thirds or more of the power supply voltage Vcc. The discharge terminal has a high impedance during timer operation, and when the timer operation ends, it becomes L level and discharges the capacitor _C4 . The resistor _R2 and the variable resistor VR are charging resistors for the capacitor _C4 , and by changing the value of the variable resistor VR, the timer operation time of the timer IC 22 can be adjusted. However, the timer
When a fall trigger is applied to IC22 and the output terminal becomes H level, the output of inverter _I2 becomes L.
level, and the output of inverter _I3 becomes H level. Darlington connected transistor _Q1 is therefore turned on. L ₁ and L ₂ are solenoids that constitute the electromagnetic coil 11, and although they are electrically wound separately, the magnetic fluxes generated are in the same direction. Solenoid _L1 is connected to switching contact ry of relay Ry via terminals a and b. In addition, solenoid L ₂ is connected to thermo couple 23 which is a frame sensor, and thermo couple 2
3 is connected to the input side of the operational amplifier 24 via terminals c and d. The thermocouple 23 is provided in a gas combustion section of a gas appliance (not shown). However, since relay Ry is not always energized,
The switching contact ry is connected to the normally closed side, so that when the transistor _Q1 is turned on as described above, a current flows through the solenoid L. At this time, the direction of the current is such that the ball valve 8 is driven in the opening direction. And during the timer operation period,
If the gas appliance ignites well, the thermocouple 23
An electromotive force is generated and current flows through solenoid _L2 .
The direction of the current at this time is also such that the ball valve 8 is driven in the opening direction. Therefore, even if the timer operation of the timer IC 22 ends and the transistor _Q1 turns off, and the current flowing to the solenoid _L1 stops, the current from the thermocouple 23 flows to the solenoid _L2 , so the ball valve 8 is opened. The state will remain the same. Note that during the timer operation period, the output of inverter _I2 is at L level, so the yellow
LED25 lights up. Furthermore, when the timer operation ends, the output of the inverter _I2 becomes H level, so the yellow LED 25 turns off. If the gas appliance is ignited normally at this time, the thermocouple 23
Thermal activation force is input to the operational amplifier 24, the output of the operational amplifier 24 becomes H level, and the transistor
Since Q ₂ and Q ₃ are turned off and the collector of transistor Q ₃ becomes H level, the inputs of NAND circuit N ₁ both become H level, and the output of NAND circuit N ₁ becomes L level, so the red LED 26 lights up. to display normal ignition status.

In this normal ignition state, the output of the inverter _I1 is at H level, so even if the push button switch 21 is turned on at this time, the fall trigger is not applied to the timer IC 22, and on the contrary, the Darlington-connected transistor Q ₄ turns on, so relay Ry
is energized, and its switching contact ry switches to the normally open side. Therefore, solenoid _L1 has terminals a and b.
The charging voltage of the capacitor _F1 is directly applied through the capacitor F1, and a large current flows. Since the direction of this current is such as to cancel the magnetic flux of the solenoid _L2 , the ball valve 8 is closed and the gas appliance is extinguished. In addition, in a normal ignition state, if the flame in the gas combustion part of the gas appliance goes out for some reason, the thermoelectromotive force of the thermocouple 23 decreases and the current flowing to the solenoid _L2 decreases, so the ball valve 8 moves in the closing direction. It is driven by

In addition, in the gas opening/closing mechanism shown in FIG.
When the operating force is set to be smaller than the operating force required to detach the ball valve 8 which is pressed against the valve seat 10 from the valve seat 10 by the pressure of the gas flowing into the valve, the electromagnetic coil 11 is energized in the valve opening direction. However, ball valve 8
The ball valve 8 cannot be separated from the valve seat 10 due to the gas pressure applied to the valve seat 10.
It remains crimped. Therefore, electromagnetic coil 1
1, the gas flowing into the valve body 1 is blocked in advance by the gas tank 2, and the manual button 18 provided at the bottom of the valve body 1 is pressed to open the valve 17 and the gas inside the valve body 1 is released. The ball valve 8 can only be returned to the opening direction by removing the gas pressure to the ball valve 8 and then energizing the electromagnetic coil 11. Therefore, in the case of this configuration, once the ball valve 8 is activated and the gas is shut off, the ball valve 8 cannot be restored even if the electromagnetic coil 11 is energized in the valve opening direction, and the front lock is closed. Since the ball valve 8 cannot be returned to its original position unless the gas tank 2 is closed and the manual button 18 is pressed, it has an important safety function in preventing secondary disasters caused by gas, and is extremely effective in disaster prevention.

Next, FIG. 4 is a partial vertical sectional view showing another gas opening/closing mechanism based on the same concept, in which a gas hose 2 whose one end is connected to a gas tank 28 of a gas appliance 27 is shown.
The other end of the valve body 1 is connected to one gas passage 5 of the valve body 1, and the other gas passage 5 of the valve body 1 is connected to the gas source side. In this gas opening/closing mechanism, when the ball valve 8 is once closed, the closed state of the ball valve 8 is maintained by the gas pressure on the gas flow path 4 side. That is, in this example, the tip 30 of the manual button 18 faces the ball valve 8 with a small gap in between, and when the manual button 18 is pressed, a gap is created between the ball valve 8 and the valve seat 10. It's becoming like that. Therefore, when returning the closed ball valve 8, the rear gas valve 28 is closed at one end,
After that, the manual button 18 is pressed. In this way, the gas pressures in the gas flow paths 4 and 5 will be approximately equal, so the gas pressure applied to the ball valve 8 can be removed, and when the electromagnetic coil 11 is energized in this state, the ball valve 8 will be opened. It is something that can be done. Note that if the gas tank 28 of the gas appliance 27 that is the rear gas appliance 27 is not closed, or if there is a gas leak in the middle even if it is closed, the gas pressure in the gas channels 4 and 5 will not be the same even if you press the manual button 18.
The gas pressure applied to the ball valve 8 is not removed and therefore the ball valve 8 does not open.

FIG. 5 is a longitudinal sectional view showing still another gas opening/closing mechanism. In this example, a valve seat 16 is provided at the opening on the gas flow path 5 side of the gas flow path 31 between the valve mechanism chamber 6 of the valve body 1 and the gas flow path 5, and the manual button 18 is An interlocking valve 17 is opposed to the valve seat 16. In this example, when returning the closed ball valve 8, the gas flow can be adjusted by pressing the manual button 18 with the front valve connected to the gas flow path 4 or the rear valve connected to the gas flow path 5 closed. Gas is made to flow through the path 31 to equalize the gas pressure in the gas passages 4 and 5, and to remove the gas pressure applied to the ball valve 8.

The above-mentioned manual button 18 may be operated by an electromagnetic solenoid and driven by an attached electric circuit. In place of the movable permanent magnet 13, a simple magnetic body that is not magnetized may be used, and the fixed iron core 12 may be magnetized by another permanent magnet instead.

The present invention is constructed as described above, and the electromagnetic operation section includes a movable permanent magnet connected to a pipe, and when the movable permanent magnet is repulsively excited, the attractive force between the fixed iron core and the movable permanent magnet is applied to push the spring. The pipe is driven in the valve opening direction by weakening the driving force, and when the movable permanent magnet stops repulsive excitation, the movable permanent magnet moves against the push driving force of the spring due to the attraction between the movable permanent magnet and the fixed iron core, and the pipe opens. Since the valve is equipped with an electromagnetic means that drives the valve in the valve closing direction, when the valve is opened, the pushing force of the spring is used to open the valve, so the electromagnetic force for opening the valve releases the adhesion between the movable permanent magnet and the fixed iron core. This requires only a small electromagnetic force, which is smaller than that which directly opens the valve using electromagnetic force.As a result, the electromagnetic means can be small, and the power source for obtaining driving power, such as a thermocouple with a small current capacity, is required. The effect is that it can be used.

[Brief explanation of the drawing]

Fig. 1 is a partial vertical sectional view showing a gas opening/closing mechanism in an embodiment of the present invention, Fig. 2 is a partially enlarged longitudinal sectional view of the same, and Fig. 3 shows an electric circuit used in the gas opening/closing mechanism of the same. The circuit diagrams, FIGS. 4 and 5 are partial longitudinal sectional views showing other gas opening/closing mechanisms, respectively, in which 1 is the valve body, 11 is an electromagnetic coil, 21 is a push button switch, 22 is a timer, and 23 is a thermocouple. , Q ₁ , and Q ₄ are transistors.

Claims (1)

[Claims] 1. A valve body with a valve mechanism chamber provided between the gas supply side gas flow path and the gas appliance connection side gas flow path, and a valve body that is movable in a direction substantially perpendicular to the direction of the gas flow path provided in the valve mechanism chamber It consists of a pipe that runs in approximately the same direction as the flow path, and an electromagnetic operating section that drives the pipe in the vertical direction, and a ball valve that fits loosely within the pipe, and a ball valve that is connected to the gas appliance connection side. Electromagnetic operation is provided by providing a spring that biases the pipe in the direction of bringing it into close contact with the valve seat provided at the opening of the pipe connected to the gas flow path, and a spring that biases the pipe and pushes the pipe in the valve opening direction. There is a movable permanent magnet connected to the pipe, and when the movable permanent magnet is repulsively excited, the attractive force between the fixed iron core and the movable permanent magnet is weakened from the pushing force of the spring, and the pipe is moved in the valve opening direction. an electromagnetic means for driving the pipe in the valve closing direction by moving the movable permanent magnet against the pushing driving force of the spring due to the attraction between the movable permanent magnet and the fixed iron core when the repulsive excitation of the movable permanent magnet is stopped; A gas switch device for a gas appliance characterized by comprising: