JP4645290B2 - Gas shut-off device - Google Patents

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.

  Conventionally, this type of gas shut-off device has been provided facing the passage position of a permanent magnet 52 attached to a rotating body 51 that rotates in conjunction with a membrane-type measuring section that measures the passage flow rate as shown in FIG. The on / off operation of the reed switch 53 is converted into an electrical signal by the flow rate detection circuit 54.

  The flow rate detection circuit 54 outputs a flow rate signal voltage obtained by dividing the voltage of the battery 55 by the resistors 56a and 56b. The microcomputer 57 receives an on / off flow rate signal from the flow rate detection circuit 54.

The microcomputer 57 is configured to monitor the flow rate value and leakage of the gas flow rate, shut off the shut-off valve 59 via the shut-off valve drive circuit 58 in the event of an abnormality, and alert the display unit 60. It is comprised so that it may supply from the battery 1 (for example, refer patent document 1).
JP 2003-121214 A

  However, in the conventional gas shut-off device, the reed switch is turned on and off by the magnetic field of the permanent magnet. Therefore, if the number of poles or the number of used permanent magnets is increased in order to measure the minute flow rate of gas, the reed switch Due to the type contact, the contact life could not satisfy the service life.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a gas cutoff device capable of measuring a flow rate with high resolution.

In order to solve the above-mentioned conventional problems, the present invention provides a controller provided in a room that is distinguished from a gas flow path of a gas meter, a battery that is a power source of the controller, and a shut-off provided in the gas flow path. A magnet is disposed in a valve and a region that passes through a fixed position for each unit flow rate measurement and is equally divided into a plurality of unit flow rates, and one of the regions where the magnet is disposed has the magnet disposed therein. A magnet unit having no part, two or more flow sensors that are provided facing the magnet, detect the magnetic force of the magnet and output a flow signal, and the flow rate that receives the flow signal and is disposed two or more Among the sensors, when the flow rate signal of one of the flow rate sensors is once, and the other flow rate sensor detects the flow rate signal more than once, the gas flow rate of the unit flow rate is judged and the gas flow rate is integrated. Computer and said flow A configuration having a precision flow rate integration unit that resets a precision flow rate integration when a precise flow rate integration value is sent to the microcomputer every time a signal is received, and the microcomputer determines that there is a gas flow rate of unit flow rate. Was taken.

  According to the above, there is a flow signal generated by the magnetic field of a plurality of magnets according to the number of divisions of the unit flow that passes through a fixed position every unit flow meter measurement, and a magnet that passes through the fixed position every unit flow measurement. If the flow rate signal of one flow rate sensor detects a flow rate signal twice or more while the flow rate signal of one flow rate sensor is one time, the unit flow rate is determined as the judgment flow rate, and the gas within the unit flow rate is detected. When measuring the flow rate, the flow rate signal can be measured with high resolution divided by the number of magnets of the unit flow volume using the flow rate signal.

  The gas cutoff device of the present invention passes through a fixed position for each unit flow rate measurement, and a flow rate signal generated by a magnetic field of a plurality of magnets according to the number of divisions of the unit flow rate that passes through a fixed position for each unit flow meter measurement. If the flow rate signal of one flow rate sensor detects a flow rate signal more than once while the flow rate signal of one flow rate sensor is once due to the area that does not have a magnet, the unit flow rate is determined as the judgment flow rate. In the case of measuring the gas flow rate within, the flow rate can be measured with high resolution divided by the number of magnets of the unit flow volume using the flow signal.

A first invention is a controller provided in a room distinguished from a gas flow path of a gas meter, a battery as a power source of the controller, a shut-off valve provided in the gas flow path, and a membrane-type metering Rotating in conjunction with the unit, passing through a fixed position for each unit flow rate measurement, placing a magnet in a region equally divided into a plurality of unit flow rates, and one of the regions where the magnet is placed is the region A magnet unit having a portion where no magnet is disposed, a first and a second facing the magnet, facing each other about the rotation axis of the magnet unit, detecting the magnetic force of the magnet and outputting a flow signal And when the flow rate signal from the second flow rate sensor is output twice while the flow rate signal from the first flow rate sensor is output once. The flow signal from the first flow sensor is output once. To the second flow rate signal from the flow sensor to determine the gas flow rate of the outputted when the unit flow rate has flowed twice integrating the gas flow rate, the flow rate signal once the output from the first flow sensor while being, in the following when the flow signal from the second flow rate sensor is outputted twice, while the flow signal from the second flow sensor is output once, the first flow rate A microcomputer that determines that a gas flow rate that is half the unit flow rate has flowed when the flow rate signal from the sensor is output twice;
Each time the microcomputer receives the flow rate signal, the microcomputer performs high-resolution measurement with a flow rate obtained by dividing the unit flow rate by the number of the areas , and integrates the flow rate with high resolution, and the unit gas flow rate flows. If it is determined that there is a gas cutoff device, the high-resolution integrated flow value is reset.

  According to the above, there is a flow signal generated by the magnetic field of a plurality of magnets according to the number of divisions of the unit flow that passes through a fixed position every unit flow meter measurement, and a magnet that passes through the fixed position every unit flow measurement. If the flow rate signal of one flow rate sensor detects a flow rate signal twice or more while the flow rate signal of one flow rate sensor is one time, the unit flow rate is determined as the judgment flow rate, and the gas within the unit flow rate is detected. When measuring the flow rate, the flow rate signal can be measured with high resolution divided by the number of magnets of the unit flow volume using the flow rate signal.

  In the second invention, in particular, when one of the two flow sensors arranged in the first invention outputs a flow signal more than once, the other flow sensor outputs the flow signal once. It has an error counter that counts every time it does not.

  Based on the above, it is possible to detect a malfunction of the flow sensor, a magnet position shift due to vibration, impact, or the like, or a false magnet detection.

  In particular, the third invention includes a calling unit that issues a calling signal when the number of error counters of the second invention exceeds a certain number.

  According to the above, it is possible to detect that the flow rate detection error is continuous, determine that the flow rate cannot be accurately measured, and notify the gas company.

  In particular, the fourth aspect of the invention includes a flow rate integration error detection unit that transmits a cutoff signal to the cutoff valve when the number of error counters of the second or third aspect of the invention exceeds a certain number.

  According to the above, it is possible to detect that the flow rate detection error is continuous, determine that the flow rate cannot be accurately measured, shut off the gas, and shut off the gas supply.

  In particular, the fifth invention is provided with a precision magnet using one multi-pole magnet of the first invention.

  According to the above, since it is not necessary to use a plurality of precision magnets, the size can be reduced.

  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)
In FIG. 1, a controller 3 provided in a room distinguished from the gas flow path 2 of the gas meter 1, a battery 4 as a power source of the controller 3, a shut-off valve 5 provided in the gas flow path 2, Each unit flow measurement passes a fixed position, and magnets 6 are arranged one by one in a region where the unit flow rate is divided by 1/12, and one of the regions where magnets 6 are arranged is magnet 6. And a magnet unit 7 having a portion that is not. The magnet unit 7 rotates in conjunction with a membrane type measuring unit that measures the passing flow rate.

  The flow sensors 8a and 8b are provided facing the passage position of the magnet 6, and output flow signals a and b each time the magnet 6 passes.

  When the gas flow rate flows and the magnet unit 7 rotates, the magnetic force of the magnet 6 is detected and the flow rate signals a and b are output. While the flow rate signal a of the flow rate sensor 8a is output once, the flow rate sensor 8b When the signal b is output twice, the flow rate sensor 8a determines that the region without the magnet 6 has passed, that is, the unit gas flow rate, and the microcomputer 9 integrates the gas flow rate.

  If the flow rate sensor 8a outputs the flow rate signal twice while the flow rate sensor 8b outputs the flow rate signal b once, it is determined that the gas flow rate is half of the unit flow rate.

  Further, when determining the gas flow rate within the unit flow rate, the flow rate signals a and b can be used to perform measurement with a high resolution of 1/12 of the unit flow rate, and the flow rate integration with a high resolution can be performed. . The integrated value obtained by high-resolution flow rate integration is reset every time the unit flow rate is determined.

Further, when the flow rate sensor 8a outputs the flow rate signal twice, the error counter 10 that counts every time the flow rate sensor 8b does not output the flow rate signal once causes the failure of the flow rate sensors 8a and 8b, vibration, shock, etc. When it is detected that the position of the magnet 6 has been misaligned or the magnet 6 has been erroneously detected, and it is repeated more than a certain number of times, it is determined that the gas flow rate cannot be measured normally, and the calling unit 11 issues a call to the central monitoring center. In addition, the flow rate integration error detection unit 12 blocks the shutoff valve and prohibits the use of gas, thereby improving the safety of the gas user.

(Embodiment 2)
The difference from the first embodiment is that one multi-pole magnet is used as the magnet.

  According to the above, since it is not necessary to use a large number of magnets, the size can be reduced.

  As described above, the gas shutoff device according to the present invention includes a flow rate signal generated by a magnetic field of a plurality of magnets according to the number of divisions of a unit flow rate that passes through a fixed position for each unit flow meter measurement, and a unit flow rate measurement. The flow rate of the unit flow rate is judged when the flow rate signal of one flow rate sensor is detected once and the other flow rate sensor detects the flow rate signal more than once due to the region that does not have a magnet passing through a fixed position. When measuring the gas flow rate within the unit flow rate, the flow rate signal can be measured with high resolution divided by the number of magnets in the unit flow volume using the flow rate signal. It can also be used for measuring instruments such as meters.

1 is a block diagram of a flow rate detection device according to a first embodiment of the present invention. Top view of the magnet unit of the device Block diagram of a conventional gas meter flow rate detection device

DESCRIPTION OF SYMBOLS 1 Gas meter 2 Gas flow path 3 Controller 4 Battery 5 Shut-off valve 6 Magnet 7 Magnet unit 8a Flow sensor (1st flow sensor)
8b Flow rate sensor (second flow rate sensor)
9 Microcomputer 10 Error counter 11 Communication unit 12 Flow rate integration error detection unit

Claims (5)

Rotating in conjunction with a controller provided in a room separated from the gas flow path of the gas meter, a battery as a power source of the controller, a shut-off valve provided in the gas flow path, and a membrane type metering unit Then, each unit flow rate measurement passes a fixed position, a magnet is arranged in a region where the unit flow rate is equally divided into a plurality, and one of the regions where the magnet is arranged does not have the magnet A magnet unit having a portion, a first flow rate sensor that faces the magnet and is provided opposite to the rotation axis of the magnet unit, detects a magnetic force of the magnet, and outputs a flow rate signal; and Next, when the flow rate signal from the second flow sensor is output twice while the flow rate signal is received and the flow rate signal from the first flow rate sensor is output once, the first flow rate is output. While the flow signal from the sensor is output once, the second It is determined that the flow rate signal from the flow sensor gas flow rate of the outputted when the unit flow rate has flowed twice integrating the gas flow rate, while the flow signal from the first flow rate sensor is output once, the After the flow rate signal from the second flow rate sensor is output twice, the flow rate signal from the first flow rate sensor is output while the flow rate signal from the second flow rate sensor is output once. A microcomputer that determines that a gas flow rate that is half the unit flow rate has flowed when output twice;
Each time the microcomputer receives the flow rate signal, the microcomputer performs high-resolution measurement with a flow rate obtained by dividing the unit flow rate by the number of the areas, and integrates the flow rate with high resolution, and the unit gas flow rate flows. A gas shut-off device that resets the high-resolution integrated flow value when it is determined that When one of the first and second flow sensors outputs the flow signal more than once, the other flow sensor has an error counter that counts every time it does not output the flow signal. The gas shut-off device according to claim 1. 3. The gas shut-off device according to claim 2, further comprising a calling unit that issues a calling signal when the number of the error counters exceeds a certain number. 4. The gas shut-off device according to claim 2, further comprising a flow rate integration error detection unit that transmits the shut-off signal to the shut-off valve when the number of error counters exceeds a certain number. The gas shut-off device according to claim 1, wherein the magnet unit includes a multi-pole magnet that is not magnetized by only one pole.

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