JP2010223527A - Fluid cutoff device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid cutoff device capable of surely cutting off a fluid in safety by a cutoff means. <P>SOLUTION: In this fluid cutoff device, a frequency switching means incorporated in a cutting off driving section 26 sets a low driving frequency, and increases driving force of a driving means of a cutoff valve 23 such as a stepping motor to cut off and drive again, when a cutoff storage section 29 is cut off, and the flow rate determining section 28 determines that a flow rate is more than a prescribed flow rate, thus the probability of cutoff of a gas flow channel 22 by the cutoff valve 23 is increased, and a gas can be more surely cut off in safety. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fluid control device that opens and closes a flow path, and more particularly to a shut-off valve device used as a shut-off mechanism of a gas shut-off device built in a gas meter or the like in order to prevent a gas accident.

  In order to prevent gas accidents, various safety devices have been used in the past.In particular, when the flow rate of the gas is detected by a flow sensor built in the gas meter and the use state of the gas is judged abnormal by the microcomputer, There is a gas shut-off device that shuts off gas with a built-in shut-off valve when the status of sensors such as an earthquake sensor, a gas pressure sensor, a gas alarm, and a carbon monoxide sensor is monitored and judged as a dangerous state. Such a gas meter with a built-in gas shut-off device, called a microcomputer meter, uses a battery as a power source, and has been promoted for its advantages such as safety, ease of gas piping, and economical price. The spread of households has been implemented, contributing to a dramatic reduction in gas accidents.

  This microcomputer meter is driven by a battery power supply so as not to be affected by power outages, etc., and since it has an economical capacity battery for the spread of all units, the shutoff valve is open and the power is maintained to keep the valve closed. It is not a fail-safe structure that is driven by a self-holding electromagnetic solenoid or PM-type stepping motor that does not need to be used, and that always moves to the safe side, that is, the gas cutoff side, when the microcomputer meter system is abnormal.

  For this reason, various system backup means have been devised and installed in order to compensate for the fact that the configuration is not fail-safe and to increase the safety of the microcomputer meter.

  A conventional fluid shutoff device (micrometer) will be described below (see, for example, Patent Document 1).

  As shown in FIG. 9, the fluid shut-off device (fuel control shut-off device) described in Patent Document 1 includes a self-holding shut-off valve 3 that is built in the gas meter 1 and can shut off the gas flow path 2, and a gas flow rate. A flow rate detection unit 4 that detects a flow rate sensor 4 and a flow rate determination unit that outputs a cutoff signal 7 to a cutoff drive unit 6 that drives the cutoff valve 3 when the flow rate signal 5 of the flow rate detection unit 4 is greater than or equal to a predetermined flow rate. 8, a shut-off storage unit 9 that stores the output of the shut-off signal 7, the state of the shut-off storage unit 9 is shutting down, and the flow rate detection unit 4 outputs a flow rate signal 5 and is in a state with a flow rate. In this case, the shut-off drive unit 6 includes a shut-off signal 10 and a shut-off flow determining unit 11 by an AND gate or the like, and a control unit 4 to 11 and a power source unit 13 such as a battery for supplying power to the shut-off valve 3. Has been. The flow rate determination unit 8, the cutoff storage unit 9, and the cutoff level determination unit 11 are realized by software means recorded in the microcomputer 14.

  The operation of the fluid shut-off device configured as described above will be described.

  In a normal state where there is no danger in using the gas, the shut-off valve 3 is in a return (opened) state, and gas can be supplied to a gas instrument (not shown) downstream of the gas meter 1. If the gas flow rate is detected at this time, the flow rate detection unit 4 outputs a flow rate signal 5.

When the flow rate determination unit 8 determines that the gas consumption pattern is abnormal, such as when the flow rate signal 5 is an abnormally large flow rate, or when the continuation of the flow rate signal 5 is abnormally long due to timer means (not shown) The shutoff signal 7 is output to the shutoff drive unit 6 to drive the shutoff valve 3 to shut off the gas flow path 2, and at the same time, the shutoff storage unit 9 stores the shutoff drive.

  Thereafter, when the flow rate detection unit 4 detects the flow rate, the flow rate signal 5 is output to the cutoff flow rate determination unit 11, and when the storage of the cutoff storage unit 9 is blocked, the cutoff flow rate determination unit 11 A cutoff signal 10 is output to the cutoff drive unit 6, and the cutoff drive unit 6 drives the cutoff valve 3 to shut off again.

As described above, the fluid shut-off device shown in FIG. 9 performs the shut-off operation again when there is a flow rate during shut-off, thereby compensating that the shut-off valve 3 is not in a fail-safe structure and improving the safety of the microcomputer meter.
JP 59-69618

  In this type of fluid shut-off device, the fact that there is a flow rate during shut-off means that the mechanism part has deteriorated characteristics such as an increase in the loss of the shut-off valve, or the drive part has deteriorated characteristics such as a voltage drop in the battery power supply part. This is often because the operation of the shut-off valve is not completed or cannot move due to a cause such as being present.

  However, the conventional fluid shut-off device shown in FIG. 9 only repeats the same shut-off operation as usual when there is a flow rate during shut-off. The probability that the flow path 2 can be blocked does not increase. That is, there is a problem that even when there is a flow rate during shutoff, there is a high possibility that the gas flow path cannot be shut off.

  In view of such a conventional problem, the present invention provides a shut-off valve even in the case where the mechanism part has deteriorated characteristics such as an increase in the loss of the shut-off valve or the drive part has deteriorated characteristics such as a voltage drop of the battery power supply part. An object of the present invention is to provide a fluid shut-off device that can increase the probability that the gas flow path can be shut off and can further improve the safety of the microcomputer meter.

  In order to solve the above-mentioned conventional problems, the fluid shutoff device of the present invention includes a shutoff means for shutting off a flow path, a shutoff state detection means for detecting a shutoff state by the shutoff means, and a shutoff state is incomplete. When detecting this, the apparatus includes a blocking force increasing means for increasing the driving force to the blocking means to drive the blocking.

  In addition, as a means for detecting that the flow path blocking operation is incomplete, a means using a flow rate detecting means or an opening / closing detecting means for detecting an open / closed state of the blocking means is provided.

  The present invention also provides means for using a boosting / charging circuit and means for amplifying the voltage with a standby power supply as boosting means for increasing the supply voltage to the cutoff means from the normal voltage.

  As described above, when it is detected that the flow path blocking operation of the blocking means is incomplete after the flow path blocking operation, in order to increase the supply voltage to the blocking means from the normal voltage and drive the blocking means again, The probability that the blocking means can block the fluid passage such as gas is increased, and the fluid can be blocked more reliably or safely.

The fluid shut-off device of the present invention is configured such that the shut-off means for shutting off the flow path and the supply voltage to the shut-off means when the flow shut-off operation of the shut-off means is incomplete after the flow shut-off operation is detected Since the blocking means is driven to be blocked again after further increase, the probability that the blocking means can block a fluid passage such as gas increases, and a fluid blocking device that blocks the fluid more reliably or safely can be provided.

  According to a first aspect of the present invention, there is provided blocking means for blocking a flow path, blocking state detection means for detecting a blocking state by the blocking means, and driving force to the blocking means when it is detected that the blocking state is incomplete. Is provided with a breaking force increasing means for raising the pressure and driving to cut off.

  Then, when it is detected that the flow path blocking operation of the blocking means is incomplete after the flow path blocking operation, the blocking means is driven again to increase the supply voltage to the blocking means to increase the blocking force. The probability that the fluid passage such as gas can be blocked increases, and the fluid can be blocked more reliably or safely.

  According to a second aspect of the present invention, a shutoff means for shutting off a fluid, a flow rate detection means for detecting a flow rate, a storage means for recording that the shutoff means is driven to shut off, and a supply voltage to the shutoff means are increased from a normal voltage. A voltage boosting means, and when the storage means is shut off, the shutoff state is detected from the detected flow rate of the flow rate detecting means, and the shutoff state is detected to be incomplete, the voltage at the boosting means Is increased to a predetermined height to increase the blocking force, and has driving means for driving the blocking means again.

  When the storage means is shut off and the flow rate detection means detects a flow rate greater than or equal to a predetermined amount, the shutoff means is driven again to increase the supply voltage to the shutoff means and increase the shutoff power. The probability that a fluid passage such as gas can be blocked increases, and the fluid can be blocked more reliably or safely.

  According to a third aspect of the present invention, there is provided a shut-off means for shutting off a fluid, an open / close detecting means for detecting an open / closed state of the shut-off means, a storage means for recording that the shut-off means is driven to shut off, and a supply voltage to the shut-off means Boosting means for increasing the voltage from the normal voltage, and when the storage means is shut off, the shutoff state is detected from the output of the open / close detection means, and the shutoff state is detected as incomplete, the boosting means Means for increasing the voltage to a predetermined height to increase the blocking force and driving the blocking means again.

  When the storage means is shut off and the output of the open / close detection means is not closed, the shutoff means is driven again to increase the supply voltage to the shutoff means to increase the shutoff force. The probability that the passage can be blocked increases, and the fluid can be blocked more reliably or safely.

  According to a fourth invention, in the fluid shut-off device according to any one of the first to third inventions, the shut-off means is a shut-off valve using a motor as a drive source, and the boosting means has a device capable of charging and boosting, When it is detected that the means is being shut off and the shut-off state is incomplete, the voltage is amplified by the boostable device, charged, and the shutting means is driven again with the energy. To do.

  If the storage means is shut off and the flow rate detection means detects a flow rate greater than or equal to a predetermined amount, or if the output of the open / close detection means is not closed, the voltage is increased to a predetermined level by the boosting means and shut off. The probability that the means can block the fluid passage such as gas increases, and the fluid can be blocked more reliably or safely.

According to a fifth invention, in the fluid shut-off device according to any one of the first to third inventions, the shut-off means is a shut-off valve using a motor as a drive source, the boosting means has a reserve power source, and the storage means is shut off. When it is detected that the shut-off state is incomplete, the standby power supply amplifies the voltage, and the shut-off means is driven again with the energy.

  If the storage means is shut off and the flow rate detection means detects a flow rate greater than or equal to a predetermined amount, or if the output of the open / close detection means is not closed, the voltage is increased to a predetermined level by the boosting means and shut off. The probability that the means can block the fluid passage such as gas increases, and the fluid can be blocked more reliably or safely.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a block diagram of a fluid cutoff device according to Embodiment 1 of the present invention.

  In FIG. 1, a PM-type stepping motor built in the gas meter 21 and capable of shutting off the gas flow path 22, a self-holding shut-off valve 23 driven by a self-holding electromagnetic solenoid, and the like, a magnetic sensor for detecting the gas flow rate, A flow rate detection unit 24 such as a pressure sensor, an ultrasonic sensor, a heat ray flow rate sensor, a fluid element sensor, a mass flow rate sensor, or a float sensor, and the shutoff valve 23 is driven when the flow rate signal 25 of the flow rate detection unit 24 is an abnormal flow rate. A flow rate determination unit 28 that outputs a cut-off signal 27 to the cut-off drive unit 26, a cut-off storage unit 29 that stores the output of the cut-off signal 27, and the flow rate detection unit When the flow rate signal 25 of 24 is determined to be greater than or equal to the predetermined flow rate Q0, there is an interruption by an AND gate or the like that outputs a cutoff signal 30 to the cutoff drive unit 26. The medium flow rate determining unit 31 and a power source unit 33 such as a battery for supplying electric power to each of these units and the shutoff valve 23 are configured. The shutoff drive unit 26 receives the shutoff signal 27 and sets the shutoff valve 23 at a normal supply voltage. When the shut-off signal 30 is received, that is, when the shut-off storage unit 29 is in the shut-off state and the flow rate is more than a predetermined amount, the shut-off drive is performed by amplifying the supply voltage. .

  The flow rate determination unit 28, the cutoff storage unit 29, the cutoff flow rate determination unit 31, and the cutoff drive unit 26 are realized by software means or a logic IC recorded in the microcomputer 34.

  FIG. 2 is a block diagram of the cutoff drive unit and the cutoff valve of the fluid cutoff device according to Embodiment 1 of the present invention.

  In FIG. 2, the shut-off valve 23 is driven by a two-phase bipolar excitation stepping motor 41 of A phase and B phase, and the shut-off drive unit 26 switches the drive voltage between the normal voltage 43 and the boost voltage 44, and the boost voltage 44 Drive voltage switching means 46 having a boosting unit 45 for generating the signal, and an excitation circuit 47 for generating a drive frequency and outputting a two-phase bipolar drive waveform.

  The drive voltage switching means 46 outputs, for example, a normal voltage 43 of 2V to the excitation circuit 47 during normal driving due to an abnormal flow rate, and the drive voltage switching means 46 is operated by the booster 45 when there is a flow rate during interruption. The normal voltage is increased to 4 V, for example, and switched to output the boosted voltage 44 and output to the excitation circuit 47.

  Note that a higher boosted voltage 44 can be output to the excitation circuit 47 by providing the charging unit in the booster 45.

  FIG. 3 is a cross-sectional view of the cutoff valve of the fluid cutoff device according to Embodiment 1 of the present invention.

In FIG. 3, a stator 57 is constituted by electromagnetic coils 51, 52 connected to A phase and B phase and yokes 53, 54, 55, 56 that transmit magnetic force, and protrudes into a permanent magnet 58 and a flow path 59. A rotor 62 composed of a lead shaft 61 having a lead portion 60 is arranged coaxially with the stator 57 and can shut off a fluid such as a gas by abutting against a valve seat 63 formed in the flow path 59 so that the lead nut can be shut off. Since the valve body 65 having the portion 64 is screwed to the lead portion 60 and the rotation of the valve body 65 is restricted by the claw-like rotation restricting means 66, the rotation of the rotor 62 causes the valve body 65 to pivot. Move back and forth in the direction.

  The stator 57 and the rotor 62 form a two-phase excitation type PM (permanent magnet) stepping motor. The electromagnetic coils 51 and 52, that is, rectangular waves having a phase difference of 1/2 · π between the A phase and the B phase. The rotor 62 is rotated by applying a current that generates a rotating magnetic field such as, and when the current is not applied, the rotor 62 is prevented from rotating by the stationary torque by the permanent magnet 58.

  In FIG. 3, when the rotor 62 rotates in the CW (clockwise) direction when viewed from the valve body 65 side, the valve body 65 performs a shut-off operation to approach the valve seat 63 and rotates in the CCW (counterclockwise) direction. Performs a return operation in which the valve body 65 moves away from the valve seat 63.

  FIG. 4 is an example of a graph showing the relationship between the drive voltage and the step-out torque of the PM type stepping motor that is the drive unit of the shut-off valve in FIG.

  As shown in FIG. 4, a higher driving voltage generates a higher torque, for example, a driving voltage of 2V is 2.1 mN · m, while a high voltage of 4V generates a strong torque of 5.2 mN · m, That is, it can be seen that the driving force of the shut-off valve becomes stronger during high voltage driving.

  The operation of the fluid shut-off device configured as described above will be described.

  When the flow rate determination unit 28 determines the flow rate signal 25 of the flow rate detection unit 24 and there is no abnormality in the gas usage state, the cutoff signal 27 is not output, and the cutoff valve 23 maintains the return state in which the gas flow path 22 is opened. .

  When the flow rate determination unit 28 determines the flow rate signal 25 of the flow rate detection unit 24 and the total flow rate is abnormally high, or when the usage time of the individual flow rate category is abnormally long, or when the gas usage state is abnormal, When an external shut-off command 37 is received by other sensors 36 such as a sensor, a pressure sensor, a gas leak sensor, etc., or a shut-off switch or a communication line, a shut-off signal 27 is output to the shut-off drive unit 26, and the shut-off drive unit 26 23 is shut off by normal drive, and at the same time, the shut-off storage unit 29 stores that the shut-off signal is output, that is, the shut-off is being performed.

  According to FIG. 2, FIG. 3, and FIG. 4, the driving voltage during this normal driving is 2V, for example, and the stepping motor 41 of the shut-off valve 23 performs the shut-off operation with a torque of 2.1 mN · m.

  After the shut-off operation, the shut-off valve 23 keeps the shut-off state even when there is no energization due to the stationary torque by the permanent magnet 58.

  When the mechanism part deteriorates in characteristics such as an increase in the loss of the shut-off valve 23 or the drive part deteriorates in characteristics such as a voltage drop of the power source 33 due to the battery, the shut-off operation of the shut-off valve 23 may not be completed. is there.

In this incomplete state of shutoff operation, the shutoff storage unit 29 stores that the shutoff is in progress, the flow rate detection unit 24 detects the flow rate, and the flow rate determination unit 28 determines that the flow rate signal 25 is greater than or equal to the predetermined flow rate Q0 and that there is a flow rate. In this case, a signal with a flow rate is generated, and the cutoff flow rate determination unit 31 outputs a cutoff signal 30 to the cutoff drive unit 26 because the cutoff is present and the flow rate is present. Shut off again.

  That is, in FIG. 2, the drive voltage switching means 46 sends a boost signal to the booster 45 in order to output a re-blocking drive voltage to the excitation circuit 47. For example, the booster 45 boosts the power supply voltage of 2V to 4V, maintains the charge, and outputs it to the excitation circuit 47. As shown in FIG. 4, the stepping motor 41 that is the drive unit of the shut-off valve 23 has 5.2 mN · m. A strong torque is generated, and the shutoff valve 23 is shut off again with a strong driving force.

  For this reason, even when the mechanism part and the drive part have deteriorated characteristics, the probability that the shutoff valve 23 can shut off a fluid passage such as gas becomes high, and the fluid can be shut off more reliably or safely.

  In this case, when the shut-off storage unit records multiple records during shut-off, and there is a flow again after shut-off, the shut-off valve is shut off again by lowering the drive frequency and increasing the drive torque. In this case, the fluid can be shut off more securely or safely.

  Next, when a return signal is given from an external means (not shown) or the like, the return drive unit (not shown) reversely drives the stepping motor 41, which is the drive unit of the shut-off valve 23, in the CCW direction, for example. At the same time that the valve 22 is returned to the open state, the shut-off record of the shut-off storage unit 29 is reset, and the normal state in which the gas can flow is restored.

  As described above, in the fluid shutoff device according to the first embodiment of the present invention, when the shutoff storage unit 29 is shutting down and the flow rate determination unit 28 determines that there is a flow rate greater than or equal to a predetermined amount, the booster unit 45 increases the boost voltage. 44, the driving force of the driving means of the shut-off valve 23 such as the stepping motor 41 is increased and driven, so that the probability that the shut-off valve 23 can shut off the gas flow path 22 is increased, and the gas is shut off more reliably or safely. Can do.

(Embodiment 2)
FIG. 5 is a block diagram of the shut-off drive unit and shut-off valve of the fluid shut-off device according to Embodiment 2 of the present invention.

  In FIG. 5, the shut-off valve 23, the flow rate detection unit 24, the flow rate judgment unit 28, the shut-off flow rate judgment unit 31, and the power supply unit 33 are the same as in FIG. 1, and the cutoff drive unit 72 receives the cutoff signal 27. 23 is driven with a normal supply voltage and receives a shut-off signal 30, that is, when the state of the shut-off storage unit 29 is shut off and a flow rate of more than a predetermined amount is detected, a standby power supply The drive voltage is switched to 73 and the drive is cut off.

  FIG. 6 is a block diagram of the shut-off drive unit and shut-off valve of the fluid shut-off device according to the second embodiment of the present invention.

  In FIG. 6, the shut-off valve 23 is the same as in FIGS. 2 and 3, and the shut-off drive unit 74 generates a driving frequency by driving power source switching means 77 for switching the driving voltage between the normal voltage 75 and the standby power source voltage 76, And an excitation circuit 78 for outputting a phase bipolar drive waveform.

  The drive power supply switching means 77 outputs a normal voltage 75 of, for example, 2V to the excitation circuit 78 at the time of normal driving due to an abnormal flow rate or the like, and the drive power supply switching means 77 is a voltage higher than the normal voltage when there is a flow rate during interruption. For example, a 4 V standby power supply voltage 76 is output to the excitation circuit 78.

  Other parts are the same as those of the fluid shutoff device of FIG.

  As described above, in the fluid shutoff device according to the second embodiment of the present invention, when the shutoff storage unit 29 is shutting down and the flow rate determination unit 28 determines that the flow rate is equal to or greater than the predetermined amount, the drive power supply switching unit 77 Since the power source is set to a high driving voltage and driven by increasing the driving force of the driving means of the shut-off valve 23 such as the stepping motor 41, the probability that the shut-off valve 23 can shut off the gas flow path 22 increases, and more reliably or safely. Gas can be shut off.

(Embodiment 3)
FIG. 7 is a block diagram of a fluid cutoff device according to Embodiment 3 of the present invention.

  In FIG. 7, a self-holding shut-off valve 23 driven by a PM stepping motor, a self-holding electromagnetic solenoid, or the like that is built in the gas meter 80 and can shut off the gas flow path 22, and the open / close state of the shut-off valve 23 are detected. Open / close detection unit 81 including a limit switch, a magnetic switch, an inductance detection means, a search coil, a photo sensor, a pressure-sensitive element, and the like, and a magnetic sensor, a pressure sensor, an ultrasonic sensor, a hot wire flow sensor, and a fluid element that detect a gas flow rate A flow rate determination that outputs a shut-off signal 27 to a shut-off drive unit 26 that drives a shut-off valve 23 when the flow rate detection unit 24 using a sensor, a mass flow sensor, a float sensor, etc. and the flow rate signal 25 of the flow rate detection unit 24 is an abnormal flow rate or the like Unit 82, a block storage unit 29 that stores the output of the block signal 27, and the state of the block storage unit 29 is If the signal of the open / close detection unit 81 is not closed and the signal is not closed, the shut-off incomplete judgment unit 84 during shut-off by an AND gate or the like that outputs a shut-off signal 83 to the shut-off drive unit 26, and power to each of these parts and the shut-off valve 23 The shut-off drive unit 26 receives the shut-off signal 27 to drive the shut-off valve 23 with a normal driving force and receives the shut-off signal 83, that is, in the shut-off storage unit 29. When the state is being shut off and the signal of the open / close detection unit 81 is not closed and is incompletely closed, the drive force voltage is switched to the high output side and the drive is cut off.

  The flow rate determination unit 82, the block storage unit 29, the blockage incomplete closing determination unit 84, and the block drive unit 26 are realized by software means, logic IC, or the like recorded in the microcomputer 85.

  Since the cutoff drive unit 26 can be the same as in the first and second embodiments, the description thereof is omitted.

  FIG. 8 is a cross-sectional view of a shutoff valve and an on / off detector of the fluid shutoff device according to the fifth embodiment of the present invention.

  In FIG. 8, the shut-off valve 23 is the same as in FIG. 1, FIG. 2, and FIG. 3, and the open / close detector 81 is arranged coaxially with the shut-off valve 23, and one end abuts when the shut-off valve 23 is closed and the other end is permanent. A rod 88 to which a magnet 87 is fixed, a housing 86 that slidably holds the rod 88, a spring 89 that is weaker than the closing force of the shut-off valve 23 that biases the rod 88 in the direction of the shut-off valve 23, and a gas meter The magnetic reed switch 91 is arranged at a distance from the gas partition wall 90 and is turned on when the permanent magnet 87 approaches and turns off when separated.

  When the position of the valve body 65 of the shut-off valve 23 is in the open state, the opening / closing detection unit 81 operates on the right side in the drawing because the rod 88 is not in contact with the valve body 65 and is biased by the spring 89. When the permanent magnet 87 is separated from the magnetic reed switch 91 and the magnetic reed switch is OFF, and the position of the valve body 65 of the shut-off valve 23 is closed, the rod 88 contacts the valve body 65 and the shut-off valve The permanent magnet 87 approaches the magnetic reed switch 91 and the magnetic reed switch is turned on by detecting the open / closed state of the shut-off valve 23 as an electrical signal. Is possible.

During normal driving due to an abnormal flow rate or the like, the cutoff drive unit 26 drives the normal driving force or cutoff stroke cutoff valve 23, the cutoff storage unit 29 is in the cutoff state, and the signal of the open / close detection unit 81 is If not closed, that is, if the magnetic reed switch is incompletely closed while being shut off, the driving force is switched to the high output side to drive off.

  As described above, in the fluid shutoff device according to the fifth embodiment of the present invention, when the shutoff storage unit 29 is shutting down and the signal of the open / close detection unit 81 is unclosed during incomplete shutoff, the shutoff drive unit 26 Is switched to the high output side and driven to shut off, the probability that the shutoff valve 23 can shut off the gas flow path 22 is increased, and the gas can be shut off more reliably or safely.

  In the above-described embodiment, the example in which the two-phase bipolar excitation PM type stepping motor 41 is the driving means has been described as the shut-off valve 23. However, it may be three or more phases, monopolar excitation, or other same-machine motor. In the example in which the shut-off drive unit shown in (1) switches the drive power source, a DC motor such as a DC brushless motor can also be selected.

  Further, the shutoff valve 23 has been described so that the rotation of the rotor 62 is directly converted into the longitudinal movement of the valve body 65, but it may be through a speed reduction mechanism or power transmission through an airtight partition such as a magnetic coupling.

  In addition, the fluid shut-off device has been described as being built in the gas meter 21 and driven by the power supply unit 33. However, the fluid shut-off device may be an isolated fluid shut-off device or may be built in a combustion device or the like. It may be driven or may be driven by a backup power source such as a capacitor.

  As described above, the fluid blocking device according to the present invention increases the driving force of the blocking unit to drive the blocking unit again when it detects that the channel blocking operation of the blocking unit is incomplete. Since the probability that the means can block the fluid passage such as gas can be increased, the present invention can be applied to an apparatus that requires a reliable operation by motor driving or the like.

1 is a block diagram of a fluid shutoff device according to a first embodiment of the present invention. 1 is a block diagram of a cutoff drive unit and a cutoff valve of the fluid cutoff device according to Embodiment 1 of the present invention. Sectional drawing of the cutoff valve of the fluid cutoff apparatus of Embodiment 1 of this invention 3 is a graph showing the relationship between the drive voltage and the step-out torque of the PM type stepping motor that is the drive unit of the shut-off valve in FIG. Block diagram of fluid shutoff device of embodiment 2 of the present invention Block diagram of shut-off drive unit and shut-off valve of fluid shut-off device according to embodiment 2 of the present invention Block diagram of fluid shutoff device according to embodiment 3 of the present invention Sectional drawing of the shut-off valve and opening / closing detection part of the fluid shut-off device of Embodiment 3 of this invention Block diagram of a conventional fluid shutoff device

22 Gas flow path (flow path)
23 Shut-off valve (shut-off means)
24 Flow rate detection unit (flow rate detection means, shut-off state detection means)
26, 72 Blocking drive part (drive means)
29. Blocking storage unit (storage means)
31 Determining part with shutoff flow rate 41 Stepping motor (motor)
44 Drive voltage switching means (cutting force increasing means)
45 Booster (Pressure booster)
73 Standby power supply 76 Current switching means 77 Drive power supply switching means (cutting force increasing means)
81 Open / close detection unit (open / close detection means, shut-off state detection means)
84 Incomplete closing judgment part during shutoff (control means)

Claims (5)

A blocking means for blocking the flow path, a blocking state detecting means for detecting a blocking state by the blocking means, and a driving for driving the blocking means when the blocking state is detected to be incomplete. A fluid shut-off device comprising a shut-off force increasing means. A shut-off means for shutting off the fluid; a flow rate detecting means for detecting the flow rate; a storage means for recording that the shut-off means is driven to shut off; and a boosting means for increasing the supply voltage to the shut-off means from the normal voltage. When the storage means is shut off, the shut-off state is detected from the detected flow rate of the flow rate detecting means, and when it is detected that the shut-off state is incomplete, the voltage is increased to a predetermined height by the boosting means. A fluid shut-off device having a drive means for increasing the shut-off force and driving the shut-off means again. A shut-off means for shutting off a fluid; an open / close detecting means for detecting an open / closed state of the shut-off means; a storage means for recording that the shut-off means is driven to shut off; and a supply voltage to the shut-off means is increased from a normal voltage. Boosting means, and when the storage means is shut off, the shut-off state is detected from the output of the open / close detection means, and when it is detected that the shut-off state is incomplete, the voltage is predetermined by the boosting means. A fluid shut-off device having a driving means for increasing the shut-off force by increasing the shut-off force to drive the shut-off means again. The shut-off means is a shut-off valve using a motor as a drive source, the boosting means has a device that can be charged and boosted, the storage means is shutting down, and if it is detected that the shut-off state is incomplete, the boosting means The fluid cutoff device according to any one of claims 1 to 3, wherein a voltage is amplified and charged by a possible device, and the cutoff means is driven again with the energy. When the shut-off means is a shut-off valve using a motor as a drive source, the boosting means has a reserve power source, the storage means is shut off, and it is detected that the shut-off state is incomplete, the voltage at the reserve power source The fluid shut-off device according to any one of claims 1 to 3, wherein the shut-off means is driven again with the energy.