JPH0979392A - Emergency cutoff device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of constitution, to reduce a cost, and to perform cutoff of gas, such as city gas, during the occurrence of an earthquake. SOLUTION: A valve casing 71 is located in the middle of a gas line and a gas bag 89 is arranged in a folded and reduction state in the opening part 84 of the valve casing 71. During the occurrence of an earthquake, a pressure container 105 filled with gas for working, such as CO2 gas, is opened, a gas bag 89 is expanded in the gas passage 83 of the valve casing 71, and the outer peripheral surface of the gas bag 89 is adhered on the inner surface of the valve casing 71 to close a gas passage 83.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency shutoff device for shutting off gas such as city gas in an emergency such as an earthquake.

[0002]

2. Description of the Related Art A typical first prior art is shown in FIG. A ball valve 45 is interposed in the gas passage, and in a state where no earthquake occurs, the ball valve 45 is opened as shown in FIG. 22 (1), and gas such as city gas is supplied. Has become. At this time, the arm 47 that drives the valve element 46 by angularly displacing it is connected to the piston 49 in the cylinder 48 via the piston rod 50.

In an emergency such as an earthquake, an electric signal 51
Is given to the electromagnetic solenoid 52, and the electromagnetic solenoid 52 is excited to open the sealing port 54 of the pressure container 53 filled with CO ₂ and C in the pressure container 53 is opened.
The piston 49 is displaced leftward by O ₂ gas as shown in FIG. 22 (2). Reference numeral 55 indicates CO ₂ gas. As a result, the valve element 46 of the ball valve 45 is angularly displaced by 90 degrees, and the gas passage is shut off.

The problem with the first prior art shown in FIG. 22 is that the ball valve 45 is used first, so that it is expensive and large in size. Furthermore, the cylinder 48 is used, and the structure is large and complicated, which reduces reliability.

A typical second prior art is shown in FIG. When not in an emergency as shown in FIG. 23 (1), the valve body 58 of the shutoff valve 57 is separated upward from the valve seat 59, and gas can flow through. Valve rod 60 of valve body 58
A magnetic attracting plate 61 is fixed to and is held by being displaced upward by the action of the permanent magnet piece 62 against the spring force of the spring 63. A seal member 65 such as an O-ring is provided to prevent the gas in the valve chamber 64 inside the shutoff valve 57 from leaking to the outside.

In an emergency such as an earthquake, FIG.
As shown in (2), a pulse signal is applied to the electromagnet 66, whereby the magnetic force of the permanent magnet piece 62 is temporarily cut off, and the magnetic attraction plate 61 is moved by the spring driving force of the spring 63, as shown in FIG. , The valve element 58 is seated on the valve seat 59 and the shutoff valve 57 is closed. The limit switch 67 detects the position of the magnetic attraction plate 61 in the valve closed state.

The second prior art shown in FIG. 23 also has a problem that the shut-off valve 57 having a relatively large structure is provided and the structure becomes large. Further, in order to prevent gas such as city gas flowing through the shutoff valve 57 from leaking,
It is necessary to provide a seal member 65 in association with the valve rod 60 so as to surely prevent its leakage. Therefore, the result is poor reliability.

The above-mentioned first prior art of FIG. 22 and FIG.
The second prior art of No. 3 is configured to use a commercial AC power supply, and the wiring work thereof is complicated, and there is a possibility of power failure in an emergency, and at this time, there is also a problem that the gas shutoff function is not achieved. is there.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide an emergency shutoff device having a compact structure, preventing gas leakage, and improving the reliability of the shutoff function.

[0010]

SUMMARY OF THE INVENTION The present invention provides at least two
A gas box is formed between two connection ports, an opening is formed to face the gas path, and a valve box is provided to face the opening and is made of a flexible material and has an inlet. In the state where the working gas is filled from the inside to the expanded state, the outer peripheral surface is in close contact with the inner surface of the valve box to close the gas passage, and the working gas is filled. A pressure vessel selected to a value at which the gas bag closes the gas passage in a state where the working gas is released to the gas bag,
A shut-off signal generating means for generating a shut-off signal for closing the gas passage is interposed between the pressure vessel and the inlet of the gas bag, and the working gas in the pressure vessel is guided to the gas bag in response to the shut-off signal. It is an emergency shutoff device characterized in that it includes an opening / closing means that opens like this. According to the present invention, in the event of an emergency such as an earthquake, a shutoff signal is generated from the shutoff signal generating means, and the opening / closing means is the same as the working gas in the pressure vessel, such as CO ₂ , N ₂ or the gas to be shut off. Gas, such as city gas, having a composition or similar composition is introduced into the gas bag by means of the opening and closing means.
As a result, the gas bag is filled with the working gas in the pressure vessel, and the outer peripheral surface of the gas bag expands and adheres to the inner surface of the valve box to block the passage of gas such as city gas. Thus, the gas is shut off with a simple structure. This structure is simple, easy to miniaturize, and easy to realize. Further, the shutoff signal generating means and the opening / closing means can be operated by using a relatively small battery having a small capacity as a power source, and it is not necessary to use a commercial AC power source. Even in the state in which the gas is turned on, it is possible to surely shut off the gas, and it is not necessary to perform the wiring work of such a commercial AC power source, so that the present invention can be easily implemented.

According to the present invention, a storage body having a storage chamber for storing a gas bag is connected to the opening of the valve box, and the inlet of the gas bag is opened in the storage body on the side opposite to the valve box. And is fixed, and an opening / closing means is attached to this storage body. According to the present invention, a storage body formed of a short pipe or the like is connected to the opening of the valve box to form a storage chamber for storing the gas bag therein, and thereby the gas bag is folded, for example. Therefore, when the working gas is supplied to and filled in the inlet of the gas bag in an emergency, the gas bag is surely inflated to close the gas passage in the valve box.

Further, according to the present invention, an airtight sheet which is ruptured by expansion due to the working gas of the gas bag is fixed between the opening portion of the valve box and the storage body to partition the inside of the valve box from the storage chamber. Is characterized by. According to the present invention, an airtight sheet, for example, an airtight sheet called a rupture disc that is ruptured by expansion due to the working gas of the gas bag partitions the opening of the valve box from the container, so that the inside of the valve box is closed. It is possible to prevent gas such as city gas that flows through the gas from constantly contacting the gas bag, which prevents deterioration of the flexibility of the gas bag and deterioration such as cracking, and prevents the gas bag from aging. Can be suppressed. The airtight sheet may be, for example, a metal thin film such as an aluminum foil, or may be a thin film such as vinyl chloride, or may be another material. Further, instead of the airtight sheet, a metal or a synthetic material may be used. It may be in the form of a mesh made of a material such as resin, or may have another structure that does not have airtightness as long as it has a function of holding the gas bag to the extent that the bag does not enter the valve box. It may be a linear body.

Further, the present invention is characterized in that a conductive wire divided by expansion of the gas bag in the storage chamber by the working gas is provided so that the conductive / disconnected state of the conductive wire can be detected from the outside. According to the present invention, the working gas is supplied to the gas bag in the storage chamber and expanded, whereby the conductive wire is divided. Therefore, it is possible to confirm whether or not the gas bag is inflated by detecting the conduction state of the conductive wire from the outside with a tester or the like, and thereby determine whether or not to perform the recovery work of the emergency shutoff device. be able to. The conductive wire may be a thin wire made of copper or the like and may be arranged along the surface of the airtight sheet, or the gas bag may be folded to reduce its size. May be provided so as to surround, or may be provided by other configurations.

Further, according to the present invention, a safety valve is provided facing the working gas space between the inlet of the gas bag and the pressure vessel,
This safety valve is characterized in that the pressure of the working gas in the working gas space is opened at a predetermined value or more that exceeds the pressure required to close the gas passage due to the expansion of the gas bag. According to the present invention, when the valve box is used in various sizes and sizes and other configurations are commonly used, for example, the valve box is small and the pressure of the working gas supplied from the pressure container to the gas bag is high. Too much and the gas bag expands abnormally, or when the valve box is large, the gas bag expands and deforms along the gas passage, and in each of these cases, the gas bag may burst or break. Occurs. Therefore, according to the present invention, a safety valve is provided between the inlet of the gas bag and the pressure container, and when the gas bag expands and exceeds a predetermined value exceeding the pressure necessary for closing the gas passage of the valve box, , Its safety valve opens and the working gas is released to the atmosphere. Therefore, the pressure of the working gas in the gas bag is kept below the predetermined value, thereby eliminating the risk of the gas bag breaking or bursting,
It is possible to reliably shut off the gas passage in the valve box.

According to the present invention, the opening / closing means has a working gas space, one end of which is fixed to the housing, and the other end of which is detachably attached to the connection port of the pressure container, and the pressure container. Sealing means provided at the connection opening of the housing and ruptured or opened by an external impact force; a first position provided in the housing and spaced from the sealing means; and a second position for activating the sealing means. A trigger that is displaceable between and has a locking portion, a spring that gives the trigger a spring force toward the second position, and the trigger that is inserted and displaceable in the housing and is locked in the first position And an electromagnetic solenoid that is excited in response to the cutoff signal and that disengages the operating piece from the locking portion of the trigger. According to the present invention, in the event of an emergency such as an earthquake, the electromagnetic solenoid is excited by the cutoff signal from the cutoff signal generating means, whereby the actuating piece is disengaged from the engaging portion of the trigger at the first position, thereby triggering. Is displaced to a second position by a spring force of a spring, and a sealing means provided at a connection port of the pressure vessel, that is, a sealing member, for example, a thin film that can be broken by a trigger is broken, or a check valve, etc. The valve body of the valve having the above structure is separated from the valve seat and opened. In this way, the working gas in the pressure vessel is supplied to the flexible gas bag.

Further, the present invention is characterized in that the housing is provided with a holding means for holding the trigger in the first position and releasing the held state. According to the invention, the actuating piece can be held in the first position by the holding means. Thus, in order to check the operation of the electromagnetic solenoid of the opening / closing means, a cutoff signal is given to the electromagnetic solenoid to check whether or not the operating piece can be displaced. At the time of this inspection, the operating piece is in the first position. Even if the stop condition is released, the trigger does not break or open the sealing means. Gas consumption is suppressed, and there is no need for troublesome restoration work.

Further, according to the present invention, the cutoff signal generating means includes a pendulum supported by a cantilever supported by processing a substrate made of conductive single crystal silicon by a semiconductor etching technique, and an electrode arranged in a vibrating direction of the pendulum. Means for detecting a shock wave of about 3 to about 10 Hz corresponding to the electrostatic capacitance between the pendulum and the electrode and generating a cutoff signal at the time of detection. According to the present invention, a cantilever-supported pendulum made of conductive single crystal silicon is used to detect a shock wave of an earthquake, and the cantilever-supported pendulum is a completely elastic body. The brittleness and creep do not occur, and the shock wave can be reliably detected. According to the invention, the shock wave of this earthquake is about 3 to about 1.
It is 0 Hz, especially about 4 to 8 Hz, and it is possible to accurately determine the occurrence of an earthquake by filtering a shock wave having such a frequency. Only when this earthquake occurs, the gas passage of the emergency shutoff device is shut off. be able to.

[0018]

FIG. 1 is a sectional view showing the overall construction of an embodiment of the present invention. The emergency shutoff device 70
It is used to shut off city gas when an earthquake occurs, and its valve box 71 is connected between city gas lines 72 and 73 shown in FIG. 2 through, for example, manual on-off valves 74 and 75.

The emergency shutoff device 70 shown in FIGS. 1 and 2 is provided upstream of the gas consuming equipment 77 provided in the housing complex 76, for example, as shown in FIG. Factory 78 as shown in 3 (2)
The emergency shutoff device 70 of the present case may be provided in various other places.

Referring again to FIG. 1, the valve box 71 is made of a material such as iron, and may be a chisel. The gas passage 83 is provided between the outward flange joints 81 and 82 which are two connection ports. Is formed, and the valve box 7 is faced to the gas passage 83.
An opening 84 is formed in the upper part of 1, and the opening 84 is also provided with an outward flange joint 85. A short tubular container 86 made of a material such as iron is detachably connected to the opening 84 of the valve box 71 by an outward flange joint 87 together with the outward flange joint 85. A gas bag 89 made of a flexible material such as rubber having elasticity and elasticity is folded and stored in a storage chamber 88 in the storage body 86 in a folded state. The inlet 90 of the gas bag 89 is opened on the side opposite to the valve box 71 (upper side in FIG. 1) of the storage body 86, and the outer peripheral portion 91 of the inlet 90 extends radially outward, so that the storage body 86 has the same shape. The outward flange joint 92 and the outward flange joint 94 of the housing 93 of the opening / closing means 130 are detachably attached and sandwiched to achieve airtightness.

The valve box 71 shown in FIG. 1 is a chisel, and the joints 81, 82, 85 at each end may have the same size and shape, but may also be a chie having a different shape, or have other shapes. Good.

FIG. 4 is a sectional view of a part of the valve box 71 and the housing 86 near the outward flange joints 85 and 87. An airtight sheet 95, which can be called a rupture disc, is detachably mounted between the opening 84 of the valve box 71 and the storage body 86, whereby the gas passage 83 of the valve box 71 and the storage body are inserted. The storage chamber 88 of 86 is airtightly partitioned. The airtight sheet is, for example, stainless steel SUS30.
4 or SUS316 and the like, and the thickness thereof is, for example, 0.2 to 0.3 mm or less, and is formed thin. The airtight sheet 95 may be made of aluminum or other metal such as aluminum foil, or may be made of a synthetic resin material film such as vinyl chloride. The outer peripheral portion of the seat 95 is sandwiched by gaskets 96 and 97 which are annular flat plates, and airtightness is secured. The gaskets 96 and 97 may be made of a material having elasticity such as rubber, or may be made of other material such as asbestos. The sheet 95 has a strength that allows the gas bag 89 to burst when inflated by the working gas in an emergency. With this seat 95, the gas passage 83 of the valve box 71 and the housing 8
Since the storage chamber 88 of No. 6 is airtightly partitioned, the city gas does not come into direct contact with the gas bag 89, thereby suppressing the deterioration of the gas bag 89 and maintaining the characteristics of the gas bag 89 for a long period of time. Can be held.

By using the sheet 95, the rust and dust contained in the city gas can be removed from the gas bag 89.
It is prevented that the gas bag 89 adheres to the gas bag 89, which also suppresses the deterioration of the gas bag 89.

In order to check whether the gas bag 89 is inflated from the outside of the emergency shutoff device of the present invention, according to the present invention, the conductive wire 98 is placed on the sheet 95, and the conductive wire 98 is placed thereon. Both ends 99 of the are extended to the outside from between the outward flange joints 85 and 87 and can be connected to a tester or the like for detecting conduction. The conductive wire 98 may have a structure in which a wire made of a material such as thin copper is covered with an electrically insulating coating layer made of synthetic resin or the like, and the sheet 95 and the gaskets 96, 97 are electrically insulated. When composed of a conductive material, it may be a bare wire. The conductive wire 98 is used for the gas bag 8 in the storage chamber 88.
9 is filled with a working gas and expanded, the sheet 9
5 has the strength of rupturing and dividing the conductive wire 98. Therefore, since the conductive wire 98 is divided by the expansion of the gas bag 89, the conductive state of the end 99 of the conductive wire 98 is detected from the outside by a tester or the like, and if it is divided and has a large impedance, the gas It can be seen that the bag 89 is inflated. As described above, the outward flange joints 85 and 87 can be connected and disconnected by the bolt 100 and the nut 101, whereby the seat 95 and the conductive wire 98 can be replaced, and recovery after an emergency cutoff can be performed. it can.

FIG. 5 is a perspective view showing the sheet 95 and the conductive lines 98 in a simplified manner. The tester 102 is used to detect the conduction and disconnection of the conductive wire 98.

In the opening / closing means 130, the housing 93 made of a metal material such as iron can be attached / detached to / from the outward flange joint 92 of the storage body 86 by the outward flange joint 94 to replace the gas bag 89, as described above. Mounted as. As described above, one end 103 of the housing 93 is provided with the outward flange joint 94, the other end 104 is engraved with an internal thread, and the connection port 106 having the external thread of the pressure vessel 105 is attached and detached. Mounted as possible.

In the pressure vessel 105, for example, CO ₂ ,
It is filled with N ₂ or a gas having the same or similar composition as the city gas flowing through the gas passage 83, and is hermetically sealed by a sealing plate 107 made of a rupturable thin metal plate.

Space 1 extending vertically in this housing 93
A trigger 109 is displaceably provided at 08. The tips 110 of the triggers 109 are different from each other and face the sealing plate 107. A locking portion 111, which is a recess, is formed at an intermediate position in the longitudinal direction of the trigger 109, and the distal end portion of the operating piece 112 is fitted and locked therein, and thus the trigger 109 is in the first position shown in FIG. Kept in. A coil-shaped spring 114 is fitted onto the shaft portion 113 of the trigger 109, and the coil spring 114 serves as the flange 11 of the trigger 109.
5 is generated toward the sealing plate 107, and the other end of the spring 114 has a support portion 116 of the housing 93.
Is supported by abutting against. The support portion 116 has a space 108.
There is a passage 117 that communicates with the inlet 90 of the gas bag 89. When the earthquake occurs, the actuating piece 112 is displaced to the left in FIG. 1, so that the engagement state between the actuating piece 112 and the engaging portion 111 of the trigger 109 is released, and the trigger 109 is actuated by the spring force of the spring 114. Its tip 11
0 breaks the sealing plate 107 to the second position. As a result, the working gas in the pressure vessel 105 is filled from the space 108 through the passage 117 into the gas bag 89 from the inlet 90 of the gas bag 89, and the gas bag 89 is inflated. Line 98 is broken. The outer peripheral surface of the inflated gas bag 89 has a valve box 71.
The gas passage 83 is hermetically closed by closely contacting the inner peripheral surface of the gas passage 83.

In the valve box 71, a support 119, such as a coarse wire mesh, which allows gas to flow through is fixed near the flange joint 82 on the downstream side in the city gas passage direction 118. This prevents the inflated gas bag 89 from moving by being swept to the downstream side (right side in FIG. 1) by the gas from the arrow 118 side, preventing damage to the gas bag 89, and closing the gas passage 83. Makes it possible to keep.

The operating piece 112 is provided outside the housing 93.
An electromagnetic solenoid 120 for displacing and driving the motor in the direction of moving away from the space 108 (leftward in FIG. 1) is provided at the excitation position by the cutoff signal. This electromagnetic solenoid 120
An electric means 121 including an electric circuit for driving and controlling the motor and a battery is fixedly mounted together with the electromagnetic solenoid 120.

The housing 93 is also fitted with a safety valve 122 in relation to the space 108.

FIG. 6 is an enlarged sectional view of the safety valve 122. The safety valve 122 is provided between the inlet 90 of the gas bag 89 and the pressure container 105, and thus faces the space 108 of the housing 93. The space 108 communicates with the discharge hole 124 formed in the housing 93, and the valve body 125
Is seated on the valve seat 127 connected to the discharge hole 124 by the spring force of the spring 126. The cover 128 is detachably attached to the outer peripheral surface of the housing 93, and the opening 1
The inside communicates with the outside due to 29. This safety valve 1
No. 22 indicates that when the pressure of the working gas in the space 108 for working gas exceeds a predetermined value, the valve element 125 causes the spring 1 to move.
It is separated from the valve seat 127 against the spring force of 26, thereby maintaining the pressure of the working gas in the space 108 at said predetermined value. The predetermined value means that when the working gas in the gas container 105 is supplied to the space 108 and the gas bag 89 is inflated, the gas bag 89 is closed.
1 is a value exceeding the pressure required for closing the gas passage 83, and when a working gas of a predetermined value or more acts,
The gas bag 89 may expand too much and may extend toward the on-off valves 74 and 75 (see FIG. 2 described above) to be deformed. By thus deforming excessively, the gas bag 89
May burst and be damaged. The safety valve 122 is
The pressure of the working gas in the space 108 is prevented from rising above such a predetermined value, and the gas bag 89 is prevented from bursting or being damaged.

In this way, when the earthquake occurs, the gas expanded by the working gas in the pressure vessel 105 shuts off the gas passage 83 of the shutoff valve box 71 as shown in FIG.

The outer peripheral surface of the operating piece 112 has a housing 93.
The O-ring 131 provided in the insertion hole makes an airtight contact, which prevents the working gas from leaking from the space 108.

FIG. 8 shows an electrical means 1 for generating a cutoff signal.
It is a block diagram which shows the concrete structure of 21. Earthquake-sensing means 133, 134, 135 for detecting shock waves caused by an earthquake
May be fixedly provided with the electromagnetic solenoid 120, but they are individually arranged at a plurality of places to prevent damage at the time of a lightning strike, whereby a plurality of (ie, 3 in this embodiment) seismic vibrations are applied. Means 133,134,1
Of the 35, even if one of the seismic means 133 is damaged, the remaining seismic means 134 or 135 operate normally, which makes it possible to accurately detect an earthquake. The respective outputs of the vibration-sensing means 133-135 are optical signals, and the light receiving elements 139a-1.
39c respectively. Light receiving elements 139a to 13
9c is realized by, for example, a CDS or a phototransistor. The respective outputs of these light receiving elements 139a to 139c are given to the conversion circuits 197 to 199 to be adjusted in output level and waveform-shaped, and then given to the AND gate 136. The output of the AND gate 136 is OR
The signal is applied to the off-delay circuit 190 from the line 138 via the gate 137, and thereby a signal for measuring a predetermined time is applied to the drive circuit 192. Drive circuit 192
Applies a cutoff signal to the electromagnetic solenoid 120 to excite it. The battery 193 functions to operate each circuit of the electric means 121. A specific electrical configuration of the seismic sensing unit 133 will be described in detail with reference to FIG. 21 described later, and the remaining seismic sensing units 134 and 135 have the same configuration as the seismic sensing unit 133.

The OR gate 137 has a manual switch 14
A signal of H level is given from the resistor 143 via 2,
A pseudo signal equivalent to the occurrence of an earthquake during inspection may be generated. The line 138 is grounded via a manual open / close switch 144 and a resistor 145 and
The level may be given so that the seismic signal is forcibly operated during inspection so that the earthquake occurrence signal is not given.

FIG. 9 is a perspective view showing a part of another embodiment of the present invention. This embodiment is similar to the configuration of FIG. 5 described above, but in this embodiment the seat 15
4 has a communication hole 155 formed therein. This communication hole 15
5, the gas in the gas passage 83 of the valve box 71 is guided to the storage chamber 88 of the storage body 86, and the storage chamber 88 is closed by the gas passage 8
It has the same pressure as 3. Therefore, the sheet 154
Is advantageous in that it is not necessary to select a strength that does not cause rupture or breakage due to the pressure difference between the gas passage 83 and the storage chamber 88, and the seat 154 can be easily selected.

FIG. 10 is a perspective view of still another embodiment of the present invention. In this embodiment, instead of the sheets 95 and 154, a net 156 in which a linear body made of metal or synthetic resin is woven is used. Sheet 154 and net 156
Has a strength to burst or break when the gas bag 89 is inflated by the working gas. Other configurations are similar to those of the above-described embodiment.

In each of the embodiments of the present invention shown in FIGS. 1 to 10, the gas bag 89 is arranged above the valve box 71. However, in another embodiment of the present invention, the gas bag 89 is provided in the valve box 71. 1 may be placed upside down so as to be arranged below the seat 9. By doing so, the seat 9
5,154,156 may be omitted, and at this time, even when the working gas is not supplied to the gas bag 89, the gas bag 89 hangs down or projects into the gas passage 83 of the valve box 71. There is no danger of

FIG. 11 is a simplified partial cross-sectional view showing still another embodiment of the present invention. In this embodiment, the valve box 157 has a right cylindrical tube 158, 159, 1.
60 may be combined and welded.

FIG. 12 is a partial perspective view showing still another embodiment of the present invention. The valve box 161 is made of, for example, cast iron and is cast, and the inner peripheral surface of the gas passage 83 has a rounded arc shape, which facilitates the gas bag 89 to be smoothly expanded and closed by the working gas. .

In yet another embodiment of the present invention, FIG.
As shown in FIG. 3, the valve box 162 is an outward flange joint 1
An elbow having 63, 164 may be provided, and a flange joint 165 may be provided in the arc portion thereof to attach the storage body 86, the opening / closing means 130 and the pressure vessel 105 in the same manner as in the above-described respective embodiments. It goes without saying that other joints, such as screw joints, may be used instead of the outward flange joints.

FIG. 14 is a partial sectional view showing still another embodiment of the present invention. The connection port 106 of the pressure vessel 105 described above is provided with a check valve-like sealing means 167. The sealing means 167 has a structure in which a valve body 170, which is seated on a valve seat 169 from inside the pressure container 105 in a valve hole 168 formed in the pressure container 105, is given a spring force in the seating direction by a spring 171. The spring 171 is interposed between the outer peripheral surface of the pressure vessel 105 and the operating portion 172 of the valve body 170 to apply a spring force in a direction in which the valve body 170 is seated on the valve seat 169.

In operation, the trigger 109 of FIG.
When the actuator 172 is displaced to the second position by the trigger 109, it is displaced upward in FIG. 14 by the trigger 109 against the spring force of the spring 171.
9, the working gas in the pressure vessel 105 is discharged and supplied to the working gas space 108.

FIG. 15 is a sectional view of a part of still another embodiment of the present invention. In this embodiment, a spherical valve body 173 is provided in the pressure vessel 105 filled with the working gas, and is seated on the valve seat 174 near the connection port 106 by the pressure of the working gas inside. The trigger 109 pushes the valve body 173 upward in FIG.
3 is separated from the valve seat 174, and the working gas in the pressure vessel 105 is discharged into the working gas space 108 and supplied.

Other configurations in the respective embodiments of FIGS. 14 and 15 are exactly the same as those in the above-mentioned respective embodiments.

FIG. 16 is a simplified sectional view showing still another embodiment of the present invention. In this form, the housing 93 is provided with a holding means 176. The holding piece 177a of the holding means 176 is locked to the other locking portion 177b of the trigger 109, whereby the trigger 109 is displaced regardless of the displacement of the actuating piece 112 to the left in FIG. 16 by the electromagnetic solenoid 120. Is prevented, which prevents breakage of the sealing plate 107, and the electromagnetic solenoid 1
The operation of 20 can be checked.

FIG. 17 is an enlarged cross-sectional view around the holding means 176. The housing 93 is engraved with an internal thread 179, and the holding piece 177a is engraved with an external thread to be engaged with the internal thread 179. The head 180 of the holding piece 177a projects to the outside of the housing 93, the cap 181 is removed, and the operator rotates the head 180 to fit the tip 182 of the holding piece 177a into the locking portion 177b of the trigger 109. It can be locked with. In this way, the operation can be inspected with or without operating the operation switches 142 and 144 (see FIG. 8) with the trigger 109 kept in the first position. Cap 1
A female screw is engraved on 81 and is screwed with a male screw 184 provided on the housing 93. The O-ring 185 ensures the airtightness of the inside of the cap 181 and thus the working gas space 108 when the cap 181 is attached.

FIG. 18 shows still another embodiment of the present invention. In this embodiment, the pressure vessel 105 is provided on the side portion of the housing 93, the electromagnetic solenoid 120 is provided on the upper portion of the housing 93, and the trigger 109 is further provided.
On the side of the housing 93 is the sealing plate 1 of the pressure vessel 105.
It is arranged so as to face 07. This embodiment is similar to the above-mentioned embodiment, and the corresponding portions bear the same reference numerals. With such a structure, the gas bag 89 is also provided.
It is possible to expand by working gas in an emergency of
The gas passage 83 in the valve box 71 is provided with an inflated gas bag 89.
Can be occluded by

FIG. 19 is a perspective view of a seismoscope 133a included in the seismic means 133. This seismic sensor 133a
Is a rectangular parallelepiped or cubic block body 11 and three mounting surfaces 12, 1 of the block body 11 orthogonal to each other.
Seismic sensors S1 and S fixed to 3 and 14 respectively
2 and S3. The block body 11 may be made of metal such as iron or aluminum, or may be made of synthetic resin, and is rigid. Sensors S1, S2
S3 has the same configuration and may be generally indicated by the reference symbol S.

FIG. 20 (1) is a sectional view of the sensor S1, and FIG. 20 (2) is a perspective view showing the sensor S1 in a cutaway manner. This sensor S1 is a pendulum 15 supported in a cantilever manner.
And both sides of the pendulum 15 (upward and downward in FIG. 20) in the direction in which the pendulum 15 reciprocally vibrates (vertical direction in FIG. 20).
And a pair of electrodes 16 and 17 arranged in. The pendulum 15 includes a pendulum body 18 and a cantilever support portion 19, and the cantilever support portion 19 is continuous with the attachment portion 20. The pendulum 15 and the mounting portion 20 are made of conductive single crystal silicon. A spacer 21 is arranged so as to face the pendulum body 18. The electrodes 16 and 17 are flat glass plates 2
2 and 23, these electrodes 16, 17
Is a thin film made of aluminum and is formed by a method such as vapor deposition. The glass plates 22 and 23 are fixed to substrates 24 and 25 made of electrically conductive single crystal silicon, and the electrodes 16 and 17 are connected to the substrates 24 and 27 through connecting holes 26 and 27 formed in the glass plates 23 and 22, respectively. 25 electrically connected. Thus, the sensor S1 is constructed symmetrically with respect to the plane of symmetry 28 of FIG. Cantilever support part 1
No. 9 is a completely elastic body, so that hysteresis, brittleness and creep do not occur. The mounting portion 20, the glass plates 22 and 23, and the substrates 24 and 25 are completely fused via silicon dioxide, and the spacer 21 is also the same, and thus the internal space 29 is airtight and is in a vacuum state. Distance d between the pendulum body 18 and the electrodes 16 and 17
1 and d2 are about 2 to 5 μm in the natural state, that is, in a state where no acceleration is applied, and in this embodiment, d
1 = d2. The spacer 21 is made of the same material as the pendulum 15 and the mounting portion 20. Thus the sensor S1
Has a length of 4 × width of 4.5 × thickness of 3 mm, and is formed in a minute shape. The thickness direction of the pendulum 15 (Fig. 20)
This sensor S1 is
It is fixed to the mounting surface 12 of the block body 11 shown in FIG. 19 with an adhesive or the like so that the x direction is aligned. The remaining sensors S2, S3 are similarly constructed.

Such a sensor S1 has stable characteristics over a long period of time and can detect acceleration with high accuracy in a wide temperature range of -40 to + 125 ° C. Since the sensor S1 is symmetric with respect to the surface 28 and therefore expands uniformly even by thermal expansion, the combined value of the capacitances of the pendulum body 18 and the electrodes 16 and 17 does not change. Further, the sensor S1 is provided with the sandwich-shaped electrodes 16, 1 to prevent an over-impact of about 4000 g (g is a gravitational acceleration), that is, a shake of the pendulum body 18 due to the excessive acceleration.
7. Therefore, since the glass plates 22 and 23 limit the pendulum body 18, the cantilever support portion 19 supporting the pendulum body 18 is not subjected to an excessive bending force, and therefore the cantilever support portion 19 is supported.
Can be prevented from being damaged. Furthermore, according to this structure, the selectivity in the sensitivity direction is excellent. That is, since the sensor S1 including the pendulum 15 forms a laminated structure in the vertical direction of FIG. 20, the sensitivity is excellent in the vertical direction of FIG. 20, and the sensitivity in the vertical direction to the paper surface of FIG. Extremely low.

Further, according to this structure, the pendulum 15
Also, the mounting portion 20 can be finely processed easily by the semiconductor etching technique, and the quality of the mounting portion 20 can be stabilized and a low price due to mass production can be realized by drastically reducing the number of manufacturing steps by automating the sensor S1. Further, the sensor S1 can be manufactured by the silicon wafer technology, and since the temperature coefficient is very small, the sensor S1 can be adjusted and shipped at room temperature, which also can significantly reduce the number of manufacturing steps. Further, it is possible to adopt a micro-etching technique, which enables miniaturization. Remaining sensor S
2 and S3 also have the same structure as the sensor S1.

FIG. 21 is a block diagram showing the electrical construction of the vibration-sensing means 133. Pendulum 15 of three sensors S1, S2, S3 and each electrode 1 in the vibration sensor 133a
6, 17 are connected to the lines 31, 32, 33 through the mounting portion 20 and the boards 24, 25, respectively. Capacitance between the pendulum 15 and the electrodes 16 and 17 is C1 and C, respectively.
When set to 2, in a natural state where no acceleration exists, C1
= C2, and when acceleration occurs, the intervals d1 and d2 (see FIG. 2 (1) described above) are different from each other due to the law of inertia, which results in C1 <C2 or C1> C2. The conversion circuit 34 is connected to the lines 31, 32 and 33, and the capacitance C of one sensor S1 is connected to the lines 35 and 36.
The voltages V1 and V2 corresponding to 1 and C2 are output, respectively.

[0055]

[Equation 1]

Here, V0 is a voltage that the temperature compensating circuit 37 gives to the converting circuit 34 via the line 38, and performs offset adjustment together with the circuit 39. Differential amplifier circuit 4
0 responds to the outputs on lines 35 and 36, respectively, and derives on line 41 an output V3 which is the difference between the voltages V1 and V2.

[0057]

[Equation 2]

Here, the combined value (C1-C2) / (C1 + C
2) is proportional to the acceleration of the sensor S1 in the x direction.

Although the above description was primarily concerned with sensor S1, the pendulum 15 of sensor S1 is
Commonly connected to the line 31 with the pendulum of the residual sensors S2, S3, and each electrode 16, 17 is connected with the corresponding electrode of the residual sensor S2, S3 in a line 32, 3
3 is connected. Therefore, C1 and C2 shown in the above equations 1 to 3 can be considered as parallel capacitances of these sensors S1, S2 and S3.

The signal derived from the amplifier circuit 40 on the line 41 is applied to the bandpass filter 141. The bandpass filter 141 has a shock wave of about 3
Derive an electrical signal of about 10 Hz, for example about 4 to about 8
It serves to derive the Hz signal.

The absolute value amplifier circuit 147 performs full-wave rectification on the output from the bandpass filter 141, derives a signal representing the absolute value of the shock wave, and supplies it to the waveform shaping circuit 148.
The waveform shaping circuit 148 has a function of deriving only a signal from the absolute value amplifying circuit 147 which continues for, for example, 20 msec or more, and interrupting the signal for less than the predetermined time. The waveform shaping circuit 148 can be realized by, for example, a combination of a monostable circuit and an AND gate.

The comparison circuit 149 level-discriminates the output of the waveform shaping circuit 148 at a predetermined level, and the on-delay circuit 150 outputs a single signal when the output of the comparison circuit 149 continues for a predetermined time, for example, 20 to 40 msec. The counter 151 functions to derive a signal having a short pulse width, and when the counter 151 receives from the on-delay circuit 150 a predetermined number of pulses, for example, 3 or more pulses per second, it determines that an earthquake occurs. And provides an H level signal to the drive circuit 152. The drive circuit 152 drives the light emitting element 201 such as the light emitting diode LED to emit light, and the optical signal thereof is given to the light receiving element 139a described with reference to FIG. 8 through the optical fiber 194.
The battery 153 functions to operate each circuit of the seismic sensing unit 133.

The remaining seismic means 134 and 135 also have the same structure as the seismic means 133 described with reference to FIGS.

The seismic sensors 133-135 may have other configurations. In addition, the pressure of the city gas is reduced by 7
In the pipe line 73 on the downstream side of 5, for example, 250 mmH
₂ O from the normal state, for example 50m per second
When it drops to mH ₂ O at a rapid rate of change, it is determined that a large amount of gas leakage has occurred, and the electromagnetic solenoid 12
A cutoff signal may be given to 0. A means for detecting such a time change rate of the gas pressure and a means for discriminating the level of the time change rate are provided, and a means for generating a cutoff signal when the absolute value of the time change rate is a predetermined value or more is provided. It may be provided. Furthermore, the shutoff signal may be generated by other configurations.

The holding means 176 in FIG.
It may also be provided in each of the embodiments of FIG.

The seismic sensing means 133 and the electrical means 121 are
Since the optical fiber 194 is interposed between the light emitting element 201 and the light receiving element 139a, damage at the time of a lightning strike can be minimized. In another embodiment of the present invention, the light emitting element 201 and the light receiving element 139a may be arranged to face each other without interposing the optical fiber 194 to form a photocoupler. Such a configuration is the same for the remaining optical fibers 195 and 196.

[0067]

According to the present invention, in the event of an emergency such as an earthquake, a shutoff signal is generated and the opening / closing means is opened so as to guide the working gas in the pressure vessel to the inlet of the gas bag, whereby the gas bag is opened. Since it expands and the outer peripheral surface of the gas bag comes into close contact with the inner surface of the valve box and closes the gas passage, it is possible to reduce the size with a simple structure, and it is possible to reliably shut off the gas, which is reliable. Is improved. Further, the shut-off signal generating means and the opening / closing means can use a power source such as a battery without using a commercial AC power source. By doing so, even in the event of a power failure of the commercial AC power source, the gas can be shut off in an emergency. It can be done reliably.

Further, according to the present invention, the gas bag is stored in the storage chamber of the storage body in a reduced state by, for example, folding, and the opening / closing means is attached to the storage body. The working gas is supplied to the inlet of the gas bag inside the storage body through the opening / closing means, and the gas bag expanded by this working gas smoothly enters the valve box through the opening of the valve box and shuts off the gas passage of the valve box. Therefore, the operation is reliable, and there is no possibility that the gas passage may become uncertain due to being caught during the inflation.

Further, according to the present invention, by interposing the airtight sheet between the opening of the valve box and the container, the gas bag remains in contact with gas such as city gas flowing through the gas passage. And the deterioration of the gas bag can be prevented. Further, the airtightness sheet can surely prevent the gas from leaking from the gas passage, thus ensuring the airtightness.

Further, according to the present invention, the conductive wire is divided by the expansion of the gas bag by the working gas, and the conductive / interrupted state of the conductive wire can be detected from the outside by using, for example, a tester. Therefore, it is possible to easily confirm whether the gas bag is inflated and determine whether or not the recovery work should be performed, and the workability is good.

Further, according to the present invention, since the working gas space between the inlet of the gas bag and the pressure vessel is provided with the safety valve, there is a possibility that an abnormally high working gas is supplied to the gas bag. As a result, the working gas having a pressure necessary for closing the gas passage in the valve box is acted, and therefore damage and damage at the time of inflation of the gas bag can be prevented. Therefore, regardless of the size of the valve box,
It is possible to share the remaining components, which improves productivity.

Further, in the opening / closing means according to the present invention, the trigger in the first position is excited by applying the shut-off signal to the electromagnetic solenoid to cause the trigger to move to the second position by the spring force of the spring.
Since the sealing means is displaced to the position to break or open, the current or power supplied to the electromagnetic solenoid is set to a small value and the pressure vessel is opened to reliably supply the working gas to the gas bag. Is easily possible, and this is important when operating the emergency shutoff device of the present invention using a battery or the like without using a commercial AC power source.

Further, according to the present invention, since the housing is provided with the holding means to hold the trigger at the first position, the operation of the electromagnetic solenoid and the operating piece of the opening / closing means is checked by the trigger to seal the pressure vessel. It can be performed without breaking or opening the stop means, there is no risk of wasting working gas, and the labor of restoration is saved, and the inspection work can be performed easily.

Further, according to the present invention, the cutoff signal generating means uses a cantilever-supported pendulum made of conductive single crystal silicon, detects the electrostatic capacitance between the pendulum and the opposing electrode, Since the cutoff signal is generated when a shock wave of about 3 to about 10 Hz is detected, it is possible to reliably detect an earthquake and shut off the gas passage at the time of occurrence of this earthquake. Further, such a pendulum can be extremely miniaturized and can be mounted on, for example, a wiring board, and the excellent effect that the miniaturization and the improvement of reliability can be achieved is also achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an overall configuration of an embodiment of the present invention.

2 is a cross-sectional view showing a state in which an emergency shutoff device 70 shown in FIG. 1 is arranged.

FIG. 3 is a simplified cross-sectional view showing various forms in which an emergency shutoff device 70 is provided.

FIG. 4 is an enlarged sectional view around the airtight sheet 95 in the embodiment shown in FIG.

5 is a simplified perspective view showing an airtight sheet 95 and conductive lines 98 in the embodiment shown in FIGS. 1 and 4. FIG.

FIG. 6 is a cross-sectional view near a safety valve 122.

FIG. 7 is a cross-sectional view showing a state in which a gas bag 89 is inflated by a working gas to block a gas passage in a valve box 71.

FIG. 8 is a block diagram showing a configuration of an electric means 121 for giving a cutoff signal to the electromagnetic solenoid 120.

FIG. 9 is a simplified perspective view showing a sheet 154 and a conductive wire 98 according to another embodiment of the present invention.

FIG. 10 is a perspective view showing a net 156 according to still another embodiment of the present invention, and this net 156 is used instead of the airtight sheet 95 and the sheet 154 in each of the above-described embodiments.

FIG. 11 is a simplified perspective view showing a valve box 157 according to another embodiment of the present invention.

FIG. 12 is a valve box 1 showing still another embodiment of the present invention.
FIG. 61 is a simplified perspective view of 61.

FIG. 13 is a perspective view showing a simplified valve box 162 according to another embodiment of the present invention.

FIG. 14 is a pressure vessel 1 according to another embodiment of the present invention.
It is sectional drawing which shows the structure of the sealing means 167 of 05.

FIG. 15 is a sealing unit 1 according to another embodiment of the present invention.
FIG. 75 is a sectional view of 75.

FIG. 16 is a sectional view of an emergency shutoff device according to still another embodiment of the present invention.

FIG. 17 is an enlarged cross-sectional view around a holding means 176.

FIG. 18 is a sectional view of an emergency shutoff device according to another embodiment of the present invention.

FIG. 19 is a perspective view showing a configuration of a seismoscope 133.

FIG. 20 is a diagram showing a cross-sectional structure of the sensor S1.

FIG. 21 is an electric circuit diagram showing the configuration of the seismic sensor 133.

FIG. 22 is a typical first prior art cross-sectional view.

FIG. 23 is a typical second prior art cross-sectional view.

[Explanation of symbols]

 15 Pendulum 16, 17 Electrode 18 Pendulum body 19 Cantilever support portion 71 Valve box 83 Gas passage 84 Opening portion 86 Storage body 88 Storage chamber 89 Gas bag 93 Housing 95 Airtight sheet 98 Conductive wire 105 Pressure vessel 107 Sealing plate 109 Trigger 111 , 177b Locking part 112 Actuating piece 114 Coil spring 120 Electromagnetic solenoid 121 Electric means 122 Safety valve 130 Opening / closing means 133, 134, 135 Seismic sensor 176 Holding means 177a Holding piece S1, S2, S3 Sensor

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshihide Kanagawa 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Osaka Gas Co., Ltd. (72) Kaoru Kawamoto 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka 1-2 within Osaka Gas Co., Ltd. (72) Hiroyuki Saito Inventor Hiroyuki Saito 3-4-9 Kikawahigashi, Yodogawa-ku, Osaka City, Osaka Prefecture Sensor Technology Research Institute Co., Ltd. (72) Shuji Saijo Tree, Yodogawa-ku, Osaka City, Osaka Prefecture 3-4-9 Kawahigashi Sensor Technology Research Institute Co., Ltd. (72) Inventor Tadashi Taniuchi 3-4-9 Kikawahigashi Kiyodo East Osaka City, Osaka City

Claims (8)

[Claims] 1. A valve box in which a gas passage is formed between at least two connection ports, and an opening is formed facing the gas passage; and a valve box provided facing the opening and made of a flexible material, A gas bag that has an inlet, the inside of which is filled with a working gas and expanded, and the outer peripheral surface of which is in close contact with the inner surface of the valve box to close the gas passage, and the working gas is filled. The filling pressure is a pressure container selected to a value at which the gas bag closes the gas passage in a state in which the working gas is released to the gas bag, and a cutoff signal generating a cutoff signal for closing the gas passage. And an opening / closing means interposed between the pressure vessel and the inlet of the gas bag for opening the working gas in the pressure vessel to the gas bag in response to the shutoff signal. Breaking device. 2. A storage body having a storage chamber for storing a gas bag is connected to the opening of the valve box, and the inlet of the gas bag is fixed to the storage body by opening on the side opposite to the valve box. The emergency shutoff device according to claim 1, wherein the opening / closing means is attached to the storage body. 3. An airtight sheet that is ruptured by expansion of the gas bag due to the working gas is fixed between the opening of the valve box and the storage body to partition the inside of the valve box from the storage chamber. The emergency shutoff device according to claim 2. 4. A conductive wire, which is divided by the expansion of the gas bag in the storage chamber by the working gas, is provided so as to be able to detect the conductive / disconnected state of the conductive wire from the outside. The emergency shutoff device described in 3. 5. A safety valve is provided facing the working gas space between the inlet of the gas bag and the pressure vessel, and the safety valve has a gas passage through which the pressure of the working gas in the working gas space is expanded by the expansion of the gas bag. Opening at a predetermined value or more that exceeds the pressure required to close the occlusion.
An emergency shutoff device according to any one of 4 to 4. 6. The opening / closing means has a working gas space, one end of which is fixed to the container and the other end of which is detachably attached to the connection port of the pressure container, and the connection port of the pressure container. Between the sealing means provided in the housing and ruptured or opened by an impact force from the outside, the first position provided in the housing and separated from the sealing means, and the second position for activating the sealing means. A trigger that is displaceable and has a locking portion; a spring that applies a spring force to the trigger toward the second position; and a trigger that is inserted and displaceable in the housing and that is engaged with the locking portion of the trigger in the first position. The emergency shutoff device according to claim 2, further comprising: an actuating piece that can be stopped and detached, and an electromagnetic solenoid that is excited in response to the shutoff signal and that disengages the actuating piece from the locking portion of the trigger. . 7. The emergency shutoff device according to claim 6, further comprising: holding means provided on the housing, the holding means being capable of holding the trigger in the first position and releasing the held state. 8. The cutoff signal generating means includes a pendulum, which is a cantilevered support in which a substrate made of conductive single crystal silicon is processed by a semiconductor etching technique, an electrode arranged in a vibrating direction of the pendulum, and a pendulum and an electrode. About 3 to about 10 corresponding to the capacitance between
The emergency shutoff device according to claim 1, further comprising means for detecting a shock wave of Hz and generating a shutoff signal at the time of detection.