JP2007071558A - Gas-blast circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect a back flow of the quantity of flow of gases and prevent the integration of the quantity of back flow. <P>SOLUTION: When the output order of positive-voltage signals or negative-voltage signals output from a flow quantity signal generation part 6 is different from a predetermined output order, a back-flow quantity detection part 9 detects a back flow of the quantity of flow. Since the order of voltages generated from a flow quantity sensor A4 and B5 when the quantity of flow of gases flows backward is different from the order of voltages generated when the quantity of flow of gases flows in a normal direction, it is possible for the back-flow quantity detection part 9 to detect a back flow and acquire an accurate integration value of the quantity of flow of gases by not integrating the quantity of flow of gases at the back flow. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas shut-off device for ensuring safety in use of gas when a gas is used after a gas meter.

FIG. 4 shows a conventional gas shut-off device described in Patent Document 1 for this type of gas shut-off device. As shown in FIG. 4, the on / off operation of the reed switch 16 provided facing the passing position of the permanent magnet 4 attached to the rotating body 5 that rotates in conjunction with the membrane type measuring unit for measuring the passing flow rate is shown in FIG. The detection circuit 14 converts it into an electrical signal. The flow rate detection circuit 17 outputs a flow rate signal voltage obtained by dividing the voltage of the battery 1 by the resistors 18a and 18b. The microcomputer 12 receives an on / off flow rate signal from the flow rate detection circuit 17. The microcomputer 12 is configured to monitor the flow rate value and leakage of the gas flow rate, shut off the shut-off valve 2 via the shut-off valve drive circuit 3 in the event of an abnormality, and alert the display unit 13. It is configured to supply from the battery 1.
JP 2003-121214 A

  However, in the conventional gas shut-off device, even if the gas flow rate flows in the reverse direction due to a temperature rise on the downstream side of the gas meter, the reed switch is turned on / off by the magnetic field of the permanent magnet, so the gas flow rate is integrated. In addition, there is a problem that the integrated value increases from the actual gas consumption.

  According to the flow rate of the gas passing through the gas flow path, a magnet unit that turns around the circulation track and divides the circulation track into n divided areas with S polarity and N polarity magnets alternately, and a large Barkhausen effect A flow rate sensor that outputs a positive voltage and a negative voltage each time the magnetic field in the iron core is reversed, and the m flow rate sensors are arranged on the n division of the magnet unit, at least one of which is n of the magnet unit. A flow signal generator that outputs a positive voltage signal when a positive voltage output from each flow sensor is detected, and outputs a negative voltage signal when a negative voltage is detected, and the flow signal generator A flow rate determination unit for calculating and determining the gas flow rate based on the output positive voltage signal or negative voltage signal, an integration unit for integrating the gas flow rate, and a gas flow rate output from the flow rate determination unit are determined in advance. When the gas flow rate is exceeded, an alarm unit that determines an abnormality in the flow rate and outputs a gas leak alarm or shut-off signal, and the output order of the positive voltage signal or negative voltage signal output from the flow signal generation unit are determined in advance. When the output order is not in order, the gas cutoff device includes a gas cutoff device having a reverse flow rate detection unit that detects a reverse flow rate.

  According to the above, since the order of the voltage generated from each flow sensor at the time of the back flow of the gas flow is different from the order of the voltage generated at the time of the flow in the forward direction, the back flow can be detected, and the gas flow rate at the back flow can be determined. By not integrating, an accurate integrated gas flow value can be obtained.

The gas shut-off device of the present invention is a magnet in which S-polar and N-polar magnets are alternately arranged in each divided region that circulates the circulation track according to the flow rate of the gas passing through the gas flow path and is divided into n. A unit, a flow sensor that outputs a positive voltage and a negative voltage each time the magnetic field in the iron core having a large Barkhausen effect is inverted, and m flow sensors are arranged on the n division of the magnet unit, and at least one of them Is arranged on the n / 2 division of the magnet unit, and outputs a positive voltage signal when detecting a positive voltage output from each flow sensor, and outputs a negative voltage signal when detecting a negative voltage, and a flow rate A flow rate determination unit that determines the gas flow rate based on a positive voltage signal or a negative voltage signal output from the signal generation unit, an integration unit that integrates the gas flow rate, and a positive voltage signal or negative output from the flow rate signal generation unit When the output order of the pressure signals is not a predetermined output order, the reverse flow detection unit that detects the reverse flow of the flow rate causes the order of the voltage generated from each flow sensor at the reverse flow of the gas flow rate to Since the order of the generated voltages is different, a backflow can be detected, and an accurate integrated gas flow rate can be obtained by not integrating the gas flow rate during backflow.

  According to a first aspect of the present invention, there is provided a magnet unit in which a S-polarity magnet and an N-polar magnet are alternately arranged in each of the divided regions that circulate the circulation orbit and divide the circulation orbit according to the flow rate of the gas passing through the gas flow path. A flow sensor that outputs a positive voltage and a negative voltage each time the magnetic field in the iron core having a large Barkhausen effect is inverted, and m flow sensors are arranged on the n division of the magnet unit, at least one of which is a magnet A flow signal generator that is arranged on the n / 2 division of the unit, outputs a positive voltage signal when a positive voltage output from each flow sensor is detected, and outputs a negative voltage signal when a negative voltage is detected, and a flow signal generation Of the flow rate determination unit for calculating and determining the gas flow rate based on the positive voltage signal or the negative voltage signal output from the unit, the integrating unit for integrating the gas flow rate, and the positive voltage signal or the negative voltage signal output from the flow rate signal generation unit When force order is not the predetermined output order, a gas cutoff apparatus having a back-flow amount detection unit for detecting a backflow of flow.

  According to the above, since the order of the voltage generated from each flow sensor at the time of the back flow of the gas flow is different from the order of the voltage generated at the time of the flow in the forward direction, the back flow can be detected, and the gas flow rate at the back flow can be determined. By not integrating, an accurate integrated gas flow value can be obtained.

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

(Embodiment 1)
FIG. 1 is a configuration diagram of a gas cutoff device according to Embodiment 1 of the present invention. FIG. 2 is a top view of the magnet unit according to the first embodiment of the present invention.

  In the figure, a magnet unit 3 in which S-polarity and N-polar magnets 2 are alternately arranged in each divided region that circulates the circulation path and divides the circulation path according to the flow rate of the gas passing through the gas flow path 1. The flow rate sensors A4 and B5 that output a positive voltage and a negative voltage each time the magnetic field in the iron core having a large Barkhausen effect is inverted, and the flow rate sensor A4 are arranged on eight divisions of the magnet unit. The flow signal generator 6 is arranged on 16 divisions of the magnet unit 3 and outputs a positive voltage signal a when detecting a positive voltage output from the flow sensors A4 and B5, and outputs a negative voltage signal b when detecting a negative voltage. From the flow rate determination unit 7 for determining the gas flow rate based on the positive voltage signal a or the negative voltage signal b output from the flow rate signal generation unit 6, the integration unit 8 for integrating the gas flow rate, and the flow rate signal generation unit 6 Output When a positive voltage signal a or negative voltage signal b output order is not the predetermined output order, a reverse flow detection unit 9 for detecting a backflow of flow.

  When the gas flow rate output from the flow rate determination unit 7 exceeds a predetermined gas flow rate, an alarm device that determines an abnormality in the flow rate and outputs an alarm signal c to the alarm device 10 or a shut-off signal d to the shut-off valve 11 12.

  FIG. 3 is a generation state diagram of positive and negative voltages of the flow sensors A4 and B5 when the gas is flowing in the positive direction. Further, section I has no gas flow rate, section II has a gas flow rate in the forward direction, section III has a gas flow rate in the reverse direction, and section IV has a gas flow rate in the forward direction.

  In section I, since there is no gas flow rate, the flow sensors A4 and B5 do not generate voltage.

  In the section II, when the gas flow rate is flowing in the positive direction, the flow rate sensor A4 first generates a positive voltage, and then the flow rate sensor B5 generates a positive voltage. Similarly, the flow sensor A4 generates a negative voltage, and then the flow sensor B5 generates a negative voltage.

  As described above, after the flow rate sensor A4 generates the voltage, the flow rate sensor B5 always repeats the generation of the voltage, and the voltage from the same flow rate sensor is not continuously generated. Voltage is generated alternately.

  When the gas flow rate flows in the reverse direction in the section III, the voltage is again output from the flow sensor A4 without generating the voltage of the flow sensor B5 next to the flow sensor A4 that generated the voltage at the end of the section II. Thus, voltage generation of the flow sensor A4 continues. This is because the flow rate sensor B5 is shifted from the flow rate sensor A4 by 1/16 division.

  At this time, the reverse flow detection unit 9 outputs a reverse flow detection signal e to the integrating unit 8 based on the voltage signal from the flow signal generation unit 6. The accumulating unit 8 that has received the reverse flow rate detection signal e stops gas accumulation thereafter.

  In the section IV, when the gas flow rate changes from the reverse direction to the forward direction, the voltage of the flow sensor B5 is not generated next to the flow sensor A4 that generated the voltage at the end of the section III, and the voltage is generated again from the flow sensor A4. Thus, the voltage generation of the flow sensor A4 continues.

  At this time, the reverse flow rate detection unit 9 outputs a reverse flow rate release signal f to the integrating unit 8 based on the voltage signal from the flow rate signal generation unit 6. The accumulating unit 8 that has received the reverse flow rate release signal f starts accumulating again.

  As described above, the gas flow rate can be accurately measured by detecting the section in which the gas flow rate flows in the reverse direction and not integrating the reverse flow rate.

  Further, the reverse flow detection signal e can be continuously output from the time when the reverse flow is detected, and the output signal can be stopped when the reverse flow is released.

  The integrating unit 8 can also take the form of integrating all the flow rate signals including the time of the reverse flow rate, and dividing the reverse flow rate integrated value from all the integrated values when the reverse flow rate is released.

  As described above, the gas shut-off device according to the present invention detects the reverse flow because the order of the voltages generated from the flow sensors at the time of the reverse flow of the gas flow is different from the order of the voltages generated at the flow rate in the forward direction. Since the accurate gas flow integrated value can be obtained by not integrating the gas flow at the time of backflow, it can be applied to the use of a measuring instrument such as a water meter or an electric meter that measures the flow by changing the magnetic field.

1 is a configuration diagram of a flow rate detection device according to a first embodiment of the present invention. Configuration diagram of the magnet unit of the device Positive / negative voltage generation state diagram Configuration diagram of conventional gas meter flow rate detection device

Explanation of symbols

1 Gas flow path 2 Magnet 3 Magnet unit 4 Flow rate sensor A
5 Flow sensor B
6 Flow rate signal generation unit 7 Flow rate determination unit 8 Accumulation unit 9 Reverse flow rate detection unit 10 Alarm unit 11 Shut-off valve 12 Alarm unit a Positive voltage signal b Negative voltage signal c Alarm signal d Block signal e Reverse flow rate detection signal f Reverse flow rate release signal

Claims (1)

According to the flow rate of the gas passing through the gas flow path, a magnet unit that turns around the circulation track and divides the circulation track into n divided areas with S polarity and N polarity magnets alternately, and a large Barkhausen effect A flow rate sensor that outputs a positive voltage and a negative voltage each time the magnetic field in the iron core is reversed, and the m flow rate sensors are arranged on the n division of the magnet unit, at least one of which is n of the magnet unit. / A flow signal generator that outputs a positive voltage signal when a positive voltage output from each flow sensor is detected and outputs a negative voltage signal when a negative voltage is detected, and is output from the flow generator. A gas flow rate determination unit that calculates and determines a gas flow rate based on a positive voltage signal or a negative voltage signal, an integration unit that integrates the gas flow rate, and a gas flow rate that is output from the flow rate determination unit is determined in advance. When the flow rate is exceeded, the alarm unit that determines an abnormality in the flow rate and outputs an alarm or shut-off signal for gas leakage, and the output order of the positive voltage signal or negative voltage signal output from the flow rate generation unit is reversed, A gas shut-off device having a reverse flow rate detection unit for detecting a reverse flow rate.

Images