JP2005140262A - Fluid shut-off device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid shut-off device capable of shutting off a fluid more positively and safely by a shut-off means. <P>SOLUTION: In the case a shut-off storage part 29 is in the middle of shutting off and a flow determining part 28 determines that there is a predetermined quantity or more of flow, a frequency switching means built in a shut-off driving part 26 sets driving frequency low and enhances the driving force of a driving means of a shut-off valve 23 such as a stepping motor to perform shut-off driving again. The probability of the shut-off valve 23 being able to shut off a gas passage 22 thereby becomes high, so that gas can be shut off more positively and safely. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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 types of safety devices have been used in the past.In particular, when the flow rate of gas is detected by a flow sensor built in a gas meter and the use state of the gas is judged abnormal by a microcomputer, Microcomputer-equipped gas with a battery power source that shuts off the gas with a shut-off valve built in the gas meter when the status of sensors such as earthquake sensors, gas pressure sensors, gas alarms, carbon monoxide sensors, etc. Gas meter with built-in shut-off device (hereinafter abbreviated as microcomputer meter) has been promoted due to advantages such as safety, ease of gas piping, economic price, etc., and almost all households have been implemented. Contributes to drastic reduction of 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. 11, the fluid shut-off device (fuel control shut-off device) described in Patent Document 1 includes a self-holding shut-off valve 3 built in the gas meter 1 and capable of shutting 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 8 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. And a shut-off storage unit 9 for storing the output of the shut-off signal 7 and shut-off when the state of the shut-off storage unit 9 is shut off and the flow rate detection unit 4 outputs a flow rate signal 5 It is comprised from the determination part 11 with the flow amount during interruption | blocking by the AND gate etc. which output the interruption | blocking signal 10 to the drive part 6, and the power supply part 13 by the battery etc. which supply electric power to these control parts 4-11 and the cutoff valve 3. . 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.

  After that, 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 The shut-off signal 10 is output to the drive unit 6, and the shut-off drive unit 6 drives the shut-off valve 3 to shut off again.

As described above, the fluid shut-off device shown in FIG. 11 improves the safety of the microcomputer meter by compensating for the shut-off valve 3 not having the fail-safe structure by performing the shut-off operation again when there is a flow rate during shut-off.
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, since the conventional fluid shut-off device shown in FIG. 11 only repeats the same shut-off operation as usual when there is a flow rate during shut-off, the shut-off valve 3 is a gas when the characteristics of the mechanism part and the drive part are deteriorated. 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 increase the safety of the microcomputer meter.

  In order to solve the above-described conventional problems, the fluid blocking device of the present invention detects blocking means for blocking a flow path and that the flow blocking action of the blocking means is incomplete after the flow blocking action. Further, the driving force or the shut-off stroke of the shut-off means is increased to drive the shut-off means again.

  As a means for detecting that the flow path blocking operation is incomplete, a flow rate detecting means and a control means for branching when a flow rate of a predetermined amount or more is detected, or an open / close detecting means for detecting an open / closed state of the blocking means and an open / close The control means for branching when the output of the detection means is not closed is provided.

  As means for increasing the driving force, means for setting the driving frequency of the frequency synchronous motor low, means for setting the motor driving current high, and means for switching the stepping motor excitation method to the high output side are provided. As means for increasing the stroke, means for setting a large number of driving steps of the stepping motor is provided.

  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, the blocking means is driven again by increasing the driving force or the blocking stroke of the blocking means. The probability that the fluid passage such as gas can be blocked increases, and the fluid can be blocked more reliably or safely.

  The fluid shut-off device of the present invention includes a shut-off means for shutting off the flow path, and when detecting that the flow shut-off operation of the shut-off means is incomplete after the flow shut-off operation, Since the shut-off means is driven to be shut off again, the probability that the shut-off means can shut off a fluid passage such as gas increases, and a fluid shut-off device that shuts off the fluid more reliably or safely can be provided.

  The first invention increases the driving force or the blocking stroke of the blocking means when it detects that the blocking means for blocking the flow path and the flow blocking action of the blocking means after the flow blocking action is incomplete. Then, the shut-off means is driven to shut off again.

  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 configured to turn off the blocking means again by increasing the driving force or the blocking stroke of the blocking means. The probability that the fluid passage can be blocked increases, and the fluid can be blocked more reliably or safely.

  According to a second aspect of the present invention, the shutoff means for shutting off the fluid, the flow rate detection means for detecting the flow rate, the storage means for recording that the shutoff means is driven to shut off, and the driving force or drive amount of the shutoff means can be varied. Drive means, the storage means is shutting off, and when it is detected that the flow path shutoff operation is incomplete from the detected flow rate of the flow rate detecting means, the driving force of the drive means is increased or shut off. It has control means for setting the stroke longer and driving the shut-off 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 drive means of the drive means is set high or the cutoff stroke is set longer to drive the shut-off means again. 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 third aspect of the present invention, there is provided a blocking means for blocking a fluid, an open / close detection means for detecting an open / closed state of the blocking means, a storage means for recording that the blocking means is driven to be driven, and a driving force of the blocking means or Drive means capable of varying the drive amount, and when the storage means is shut off, and the output of the open / close detection means detects that the flow path shut-off operation is incomplete, the drive force of the drive means Or a control means for setting the shut-off stroke long and setting the shut-off stroke to be long.

  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 by setting the driving force of the drive means high or setting the shutoff stroke long to shut off the shutoff means again. The probability that the fluid 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 frequency synchronous motor as a drive source, the drive means can switch the drive frequency, and the storage means Is shut off, and when it is detected that the flow path shut-off operation is incomplete, the drive frequency is set low and the shut-off means is driven again.

  If the storage means is shut off and the flow rate detection means detects a flow rate greater than a predetermined amount, or if the output of the open / close detection means is not closed, the drive frequency of the synchronous motor such as a stepping motor is set with a low drive frequency. That is, since the driving force of the shut-off means is increased, the probability that the shut-off means can shut off a fluid passage such as gas increases, and the fluid can be shut off 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 drive means can switch the drive current, and the storage means is shut off If the flow rate detection means detects a flow rate of a predetermined amount or more, or if the output of the open / close detection means is not closed, the drive current is set high and the cutoff means is driven again.

  If the storage means is shut off and the flow rate detection means detects a flow rate of a predetermined amount or more, or if the output of the open / close detection means is not closed, the drive current is set high and the motor drive torque, that is, the cutoff means Since the driving force is increased to drive, there is a high probability that the blocking means can block the fluid passage such as gas, and the fluid can be blocked more reliably or safely.

  A sixth invention is the fluid shut-off device according to any one of the first to third inventions, wherein the shut-off means is a shut-off valve using a stepping motor as a drive source, the drive means can switch the excitation method, and the storage means If it is detected that the flow path blocking operation is incomplete, the excitation method is switched to the high output side and the blocking means is driven again.

  If the storage means is shut off and the flow rate detection means detects a flow rate of a predetermined amount or more, or if the output of the open / close detection means is not closed, the excitation method is switched to the high output side, that is, the stepping motor drive torque, Since the driving force of the shut-off means is increased and driven, the probability that the shut-off means can shut off a fluid passage such as a gas increases, and the fluid can be shut off more reliably or safely.

  A seventh invention is the fluid shut-off device according to any one of the first to third inventions, wherein the shut-off means is a shut-off valve using a stepping motor as a drive source, the drive means can switch the number of drive steps, and the storage means Is shut off, and when it is detected that the flow path shut-off operation is incomplete, the number of drive steps is set to be large and the shut-off means is driven again.

  When the storage means is shut off and the flow rate detection means detects a flow rate of a predetermined amount or more, or when the output of the open / close detection means is not closed, the drive step number is set by increasing the number of drive steps. Since the shut-off stroke of the drive means is driven long, the probability that the shut-off means can shut off a fluid passage such as gas increases, and the fluid can be shut off 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 power to each of these units and the shut-off valve 23 are configured. The shut-off drive unit 26 receives the shut-off signal 27 and controls the shut-off valve 23 with a normal driving force or When driving with a shut-off stroke and receiving a shut-off signal 30, that is, when the state of the shut-off storage unit 29 is being shut off and a flow rate of more than a predetermined amount is detected, the driving force is increased to the high output side. Alternatively, the cut-off stroke is switched over for a long time to drive off.

  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 42 is a frequency switching means composed of a counter, a timer or the like for switching the drive frequency 43. 44, distribution means 46 for outputting a drive waveform 45 synchronized with the drive frequency 43, and an excitation circuit 47 for converting the drive waveform 45 into a two-phase bipolar drive waveform and simultaneously amplifying the power.

  During normal driving due to abnormal flow or the like, the frequency switching means 44 outputs a driving frequency 43 having a high frequency of, for example, 200 Hz to the distributing means 46, and in the case of a flow rate during shut-off, the frequency switching means 44 is as low as 100 Hz, for example. The drive frequency 43 is switched to output to the distribution means 46.

  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 frequency of the stepping motor, which is the drive unit of the shut-off valve of FIG. 3, and the step-out torque.

  As shown in FIG. 4, a lower driving frequency generates a higher torque, for example, a driving frequency of 200 Hz is 1.9 mN · m, while a low frequency of 100 Hz generates a strong torque of 3.2 mN · m, That is, it can be seen that the driving force of the shut-off valve becomes stronger during low frequency 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 frequency during this normal driving is 200 Hz, for example, and the stepping motor 41 of the shut-off valve 23 performs the shut-off operation with a torque of 1.9 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 is deteriorated in characteristics such as an increase in the loss of the shut-off valve 23 or the drive part is deteriorated 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 is not completed. There is.

  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 high, and the cutoff drive unit 26 is a high output drive and cutoff valve. 23 is shut off again.

  That is, in FIG. 2, since the frequency switching means 44 outputs a driving frequency 43 as low as 100 Hz to the distributing means 46 and drives the shut-off valve 44 via the excitation circuit 47, the drive of the shut-off valve 23 as shown in FIG. The stepping motor 41, which is a part, emits a strong torque of 3.2 mN · m, and the shut-off valve 23 re-blocks 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 memory unit has a plurality of records during shut-off, and there is a flow rate again after shut-off with a flow rate during shut-off, the shut-off valve may be shut off again by lowering the drive frequency. The fluid can be shut off more reliably 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 the predetermined amount, the frequency switching unit 44 is driven. Since the frequency 43 is set low and the driving force of the driving means of the shut-off valve 23 such as the stepping motor 41 is increased and driven, the probability that the shut-off valve 23 can shut off the gas flow path 22 is increased, and the gas is supplied more reliably or safely. Can be blocked.

(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 is the same as in FIGS. 1, 2, and 3, and the shut-off drive unit 72 switches current switching means 76 that switches between a normal current circuit 74 through a limiting resistor 73 and a high current circuit 75 without a limiting resistor. And an excitation circuit 77 that amplifies power in accordance with the current from the current switching means 76.

  At the time of normal driving due to abnormal flow or the like, the current switching means 76 outputs a driving current as low as 200 mA, for example, to the excitation circuit 77, and in the case of a flow rate during interruption, the current switching means 76 increases to a driving current as high as 400 mA, for example. The excitation circuit 77 is driven by switching.

  FIG. 6 is an example of a graph showing the relationship between the drive current 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. 6, a higher driving current generates a higher torque. For example, a driving current of 200 mA is 1.3 mN · m, while a high current of 400 mA 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 current driving.

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

  Thus, 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 there is a flow rate greater than or equal to the predetermined amount, the current switching unit 76 is driven. Since the driving force of the driving means of the shutoff valve 23 such as the stepping motor 41 is increased by setting the current high, the probability that the shutoff valve 23 can shut off the gas flow path 22 is increased, and the gas is shut off more reliably or safely. can do.

  Although the current switching unit has been described as switching the current by switching the presence or absence of the limiting resistor, the current may be switched by switching the drive voltage, the power supply voltage of the excitation circuit, and the ON duty of the drive circuit.

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

  In FIG. 7, the shut-off valve 23 is the same as in FIGS. 1, 2, and 3, and the shut-off drive unit 82 switches the excitation method to 1-2 phase excitation and 2-phase excitation and outputs to the distribution means 83. It comprises means 84 and an excitation circuit 86 that converts the drive waveform 85 into a two-phase bipolar drive waveform and simultaneously amplifies the power.

  At the time of normal driving due to abnormal flow or the like, the excitation method switching means 84 outputs to the drive signal 87 distribution means 83 for 1-2 phase excitation, so that the shut-off valve 23 is driven with a weak torque with low current consumption and there is a flow rate during shut-off. In the state, the excitation method switching means 84 outputs a two-phase excitation drive signal 88 to the distribution means 83, and the excitation circuit 86 drives the shut-off valve 23 with a strong torque with high current consumption.

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

  Thus, in the fluid shutoff device according to the third embodiment of the present invention, the shutoff valve 23 is driven by the 1-2 phase excitation drive signal 87 with low current consumption in the normal state, and the shutoff storage unit 29 is shutting down. When the flow rate determination unit 28 determines that there is a flow rate greater than or equal to a predetermined amount, the excitation method switching means 84 switches to a high-output two-phase excitation drive signal 88 to increase the driving force of the drive means of the shutoff valve 23 such as the stepping motor 41. Since it drives, the probability that the shutoff valve 23 can shut off the gas flow path 22 increases, and the gas can be shut off more reliably or safely.

  The excitation method switching means switches between 1-2-phase excitation and 2-phase excitation, but may switch between monopolar driving and bipolar driving.

(Embodiment 4)
FIG. 8 is a block diagram of the shut-off drive unit and shut-off valve of the fluid shut-off device according to the fourth embodiment of the present invention.

  In FIG. 8, the shut-off valve 23 is the same as in FIGS. 1, 2, and 3, and the shut-off drive unit 92 switches the number of steps for driving the shut-off valve 23 between the normal step number and the long step number and outputs it to the distribution means 93. Drive step switching means 94 for converting the drive waveform 89 into a two-phase bipolar drive waveform and simultaneously amplifying the power.

  At the time of normal driving due to abnormal flow, the drive step switching means 94 has a normal number of steps, for example, the lead pitch of the shut-off valve 23 is 2 mm / rotation, the step number of the stepping motor 41 is 48 steps / rotation, and the total stroke is 6 mm. Since the minimum required number of steps is 144, the normal number of steps is a safety factor of 1.25, and a 180-step drive pulse is output. 94 outputs a drive pulse having a long step number 270 steps which is 1.5 times the normal step number. After the shut-off valve 23 is shut off, the remaining drive pulse is a stepping motor 41 which is a drive unit of the shut-off valve 23. Is consumed at the valve closing cutoff position.

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

  A state with a flow rate during shut-off occurs when the mechanism part deteriorates in characteristics such as an increase in the loss of the shut-off valve 23, or when the drive part deteriorates in characteristics such as a voltage drop of the power source 33 due to the battery. This is because the shut-off operation of the valve 23 is not completed. At this time, the stepping motor 41 which is a drive unit of the shut-off valve 23 does not operate by partially stepping out with respect to the drive pulse. In many cases, the number of drive pulses is insufficient, and as a result, the cutoff operation is not completed due to the insufficient number of drive pulses.

  Even in such a case, in the fluid shut-off device according to the fourth embodiment of the present invention, the shut-off valve 23 is driven with a normal number of steps of 180 in the normal state, whereas the shut-off storage unit 29 is shut off. When the flow rate determination unit 28 determines that there is a flow rate greater than or equal to the predetermined amount, the drive step switching means 94 switches to a drive pulse with a long step number of 270 steps corresponding to a long stroke. Since the drive stroke is increased to drive, 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.

(Embodiment 5)
FIG. 9 is a block diagram of a fluid cutoff device according to Embodiment 5 of the present invention.

  In FIG. 9, a self-holding shut-off valve 23 that is built in the gas meter 101 and is driven by a PM stepping motor, a self-holding electromagnetic solenoid, or the like that 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 102 including a limit switch, a magnetic switch, an inductance detection means, a search coil, a photosensor, a pressure-sensitive element, etc., and a magnetic sensor, a pressure sensor, an ultrasonic sensor, a heat ray flow sensor, and a fluid element that detect a gas flow rate A shut-off determination that outputs a shut-off signal 27 to a shut-off drive unit 26 that drives the shut-off valve 23 when the flow rate detector 25 of the sensor, mass flow sensor, float sensor, etc. Unit 103, a block storage unit 29 that stores the output of the block signal 27, and the block storage unit 29 When the state is being shut off and the signal of the open / close detection unit 102 is not closed, the shut-off incomplete determination unit 105 during shut-off by an AND gate or the like that outputs a shut-off signal 104 to the shut-off drive unit 26, these parts, and the shut-off valve 23 When the cutoff drive unit 26 receives the cutoff signal 27 to drive the cutoff valve 23 with a normal driving force or cutoff stroke and receives the cutoff signal 104, that is, When the state of the shut-off storage unit 29 is shut-off and the signal of the open / close detection unit 102 is not fully closed during shut-off, the driving force is cut off by switching the high output side or the shut-off stroke for a long time.

  The flow rate determination unit 103, the cutoff storage unit 29, the closed / incomplete cutoff determination unit 105, and the cutoff drive unit 26 are realized by software means or a logic IC recorded in the microcomputer 106.

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

  FIG. 10 is a cross-sectional view of the shutoff valve and the open / close detection unit of the fluid shutoff device according to the fifth embodiment of the present invention.

  10, the shut-off valve 23 is the same as that shown in FIGS. 1, 2, and 3. The on / off detector 102 is arranged coaxially with the shut-off valve 23, and one end contacts the shut-off valve 23 when the valve is closed, and the other end is permanent. A rod 113 to which a magnet 112 is fixed, a housing 111 that slidably holds the rod 113, a spring 114 that is weaker than the closing force of the shut-off valve 23 that biases the rod 113 in the direction of the shut-off valve 23, and a gas meter The magnetic reed switch 116 is arranged at a distance from the gas partition wall 115 and turns on when the permanent magnet 112 approaches and turns off when the permanent magnet 112 moves away.

  When the position of the valve body 65 of the shutoff valve 23 is in the open state, the opening / closing detection unit 102 operates because the rod 113 is not in contact with the valve body 65 and is biased by the spring 114 and is on the right side in the figure. When the permanent magnet 112 is separated from the magnetic reed switch 116 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 113 contacts the valve body 65 and the shut-off valve When the permanent magnet 112 approaches the magnetic reed switch 116 and the magnetic reed switch is turned on, the open / closed state of the shut-off valve 23 is detected 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 102 is If not closed, that is, if the magnetic reed switch is not fully closed while the magnetic reed switch is OFF, the driving force is cut off by switching the high output side or the interruption stroke for a long time.

  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 102 is unclosed during incomplete shutoff, the shutoff drive unit 26 Therefore, 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, but it may be three-phase or more, monopolar excitation, or other same-machine motor. In the example in which the cutoff drive unit shown in FIG. 5 switches the current, a DC motor such as a DC brushless motor can also be selected.

  Further, the drive means of the shut-off valve 23 may be not only a motor but also an electromagnetic solenoid designed so that the shut-off drive force can be changed by changing the drive current or by changing the drive time. If it can be changed, it is not necessarily a self-holding motor or an electromagnetic solenoid.

  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 battery 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. Or may be driven by an backup power source such as a capacitor.

  As described above, the fluid shut-off device according to the present invention increases the driving force or the shut-off stroke of the shut-off means and drives the shut-off means again when it detects that the flow shut-off operation of the shut-off means is incomplete. Therefore, since the probability that the blocking means can block the fluid passage such as gas can be increased, it can be applied to a device 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 frequency of the PM stepping motor, which is the drive unit of the shut-off valve in FIG. 3, and the step-out torque. Block diagram of shut-off drive unit and shut-off valve of fluid shut-off device according to embodiment 2 of the present invention 3 is a graph showing the relationship between the drive current 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 shut-off drive unit and shut-off valve of fluid shut-off device according to embodiment 3 of the present invention Block diagram of shut-off drive unit and shut-off valve of fluid shut-off device according to embodiment 4 of the present invention Block diagram of fluid shutoff device according to embodiment 5 of the present invention Sectional drawing of the cutoff valve and opening / closing detection part of the fluid cutoff apparatus of Embodiment 5 of this invention Block diagram of a conventional fluid shutoff device

Explanation of symbols

22 Gas flow path (flow path)
23 Shut-off valve (shut-off means)
24 Flow rate detection unit (flow rate detection means)
26, 42, 72, 82, 92 Blocking drive part (drive means)
29. Blocking storage unit (storage means)
31 Determining part with flow rate during shutdown (control means)
41 Stepping motor 44 Frequency switching means 76 Current switching means 84 Excitation system switching means 94 Drive step switching means 102 Open / close detection unit (open / close detection means)
105 Incomplete closing determination unit during shutdown (control means)

Claims (7)

A blocking means for blocking the flow path, and when the flow blocking action of the blocking means is detected to be incomplete after the flow blocking action, the driving force or the blocking stroke of the blocking means is increased to shut the blocking means again. Driven fluid shut-off device. 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 be shut off; and a drive means capable of changing the driving force or drive amount of the shut-off means. If the storage means is shut off, and it is detected that the flow path shut-off operation is incomplete from the detected flow rate of the flow rate detecting means, the driving force of the drive means is set higher or the shut-off stroke is set longer. A fluid shut-off device having control means for driving the shut-off means again. A shut-off means for shutting off the fluid, an open / close detecting means for detecting an open / close state of the shut-off means, a storage means for recording that the shut-off means is driven to shut off, and a driving force or drive amount of the shut-off means can be varied. Drive means, and when the storage means is shut off, and it is detected from the output of the open / close detection means that the flow path shut-off operation is incomplete, the drive force of the drive means is increased or the shut-off stroke is increased. A fluid shut-off device having a control means for setting the length long and driving the shut-off means again. When the shut-off means is a shut-off valve using a frequency synchronous motor as a drive source, the drive means can switch the drive frequency, the storage means is shut off, and it is detected that the flow path shut-off operation is incomplete, The fluid cutoff device according to any one of claims 1 to 3, wherein the cutoff means is driven again with a drive frequency set low. The shut-off means is a shut-off valve that uses a motor as the drive source, the drive means can switch the drive current, the storage means is shut off, and the flow rate detection means detects a flow rate greater than a predetermined amount, or the open / close detection means 4. The fluid shut-off device according to claim 1, wherein when the output is not closed, the shut-off means is driven again by setting the drive current high. If the shut-off means is a shut-off valve using a stepping motor as a drive source, the drive means can switch the excitation method, the storage means is shut off, and if it detects that the flow path shut-off operation is incomplete, the excitation means 4. The fluid shut-off device according to claim 1, wherein the shut-off unit is driven again by switching the system to a high output side. When the shut-off means is a shut-off valve using a stepping motor as a drive source, the drive means can switch the number of drive steps, the storage means is shut off, and it is detected that the flow path shut-off operation is incomplete, The fluid cutoff device according to any one of claims 1 to 3, wherein the cutoff means is driven again after setting a large number of drive steps.

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