KR20100001938A - Magneto gas meter with a function of monitoring access of an interference magnet causing distortion of a magnetic field - Google Patents
Magneto gas meter with a function of monitoring access of an interference magnet causing distortion of a magnetic field Download PDFInfo
- Publication number
- KR20100001938A KR20100001938A KR1020080062048A KR20080062048A KR20100001938A KR 20100001938 A KR20100001938 A KR 20100001938A KR 1020080062048 A KR1020080062048 A KR 1020080062048A KR 20080062048 A KR20080062048 A KR 20080062048A KR 20100001938 A KR20100001938 A KR 20100001938A
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- South Korea
- Prior art keywords
- magnet
- magnetic
- magnetic sensor
- gas
- magnetic field
- Prior art date
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/24—Housings ; Casings for instruments
- G01D11/245—Housings for sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D4/00—Tariff metering apparatus
- G01D4/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/061—Indicating or recording devices for remote indication
- G01F15/063—Indicating or recording devices for remote indication using electrical means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/065—Indicating or recording devices with transmission devices, e.g. mechanical
- G01F15/066—Indicating or recording devices with transmission devices, e.g. mechanical involving magnetic transmission devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F3/00—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow
- G01F3/02—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement
- G01F3/20—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows
- G01F3/22—Measuring the volume flow of fluids or fluent solid material wherein the fluid passes through the meter in successive and more or less isolated quantities, the meter being driven by the flow with measuring chambers which expand or contract during measurement having flexible movable walls, e.g. diaphragms, bellows for gases
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
The present invention relates to an automatic meter reading technology of a meter, and more particularly, to compensate for an error by monitoring the approach of an external interference magnet that causes a weighing error in digitizing a gas usage using a magnet, or to cause an error. It is about the technology that can secure the basis for reasonable resolution of the disputes surrounding
Various techniques are known for converting gas usage into electrical signals for digitizing for automatic metering of diaphragm gas meters. One way is to use magnets. The magnet is mounted on a specific part of the gas meter which repeatedly performs a certain pattern of movement according to the use of the gas, and the magnetic field sensor measures the change in the magnetic field intensity coming out of the magnet repeatedly performing the movement with the specific part. The measured change in magnetic field strength shows a regular pattern. The number of times the pattern appears is a value corresponding to the gas usage. Therefore, the gas consumption value can be converted by signal processing for counting the number of times the pattern is generated.
On the other hand, a volume of gas varies in volume due to changes in its temperature and / or pressure. The diaphragm type gas meter measures gas consumption in volume units, whereas the charge for gas consumption is based on the weight of the gas. Therefore, there is a problem that a gas usage error (temperature pressure error) occurs due to temperature and pressure changes. In order to eliminate such a pressure error, a technique for attaching a device for measuring a volume (usage) by measuring the shrinkage or expansion rate of a gas volume to a meter has been proposed (for more details, refer to Korean Patent Publication No. 10- See 2007-0035676 (Name of the Invention: Temperature Pressure Error Compensator for Capacitive City Gas Meter with Automatic Metering Function). The on-pressure error correction device detects the rotation of the number wheel of the meter and measures the meter usage.At the same time, it measures the temperature and pressure of the gas and multiplies or divides it by multiplying or dividing the correction coefficient calculated by the gas volume correction formula such as Boyle-Shalal's law. Calculate the usage.
As such, the `` on-demand pressure compensator '' for diaphragm meters is essential for the digitization of the gas usage value of the diaphragm gauges. It is to detect the rotation of the magnet. This allows automatic counting of the number of revolutions of that particular number wheel. As a method of detecting the rotation of the magnet, a method of attaching a magnetic sensor to detect a change in the magnetic field outside the meter display window is used. The position where the magnetic sensor is installed is preferably a suitable point on the rotation path of the specific number wheel (ie, the rotation path of the magnet) to which the magnet is attached. Magnetic sensors include reed switches, ole sensors, magnetoresisters, and the like. The magnetic sensor converts the detected magnetic field strength into an electrical signal corresponding thereto, and generates an analog signal corresponding to such a change in the detected magnetic field strength. Digitizing the analog signal allows the magnet's rotation, that is, the rotation of that particular number wheel, to be counted as an electrical signal.
The particular wheel on which the magnet is installed rotates at a speed proportional to the gas usage, and so is the magnet attached to it. The strength of the magnetic field detected by the magnetic sensor is, of course, the weakest when the magnet is closest and the furthest and farthest. As the specific number wheel rotates, the distance between the magnet attached or embedded therein and the magnetic sensor fixed at a predetermined position is repeated and then reappeared, and the difference in distance is smaller than the diameter of the specific number wheel. Therefore, when a magnet with a large magnetic field is used, the ratio of the change in the magnetic field (the ratio of the magnetic field strength at the latest point and the most recent point of the magnetic sensor divided by the strength of the magnetic field at the most recent point or the lowest point) , The resolution of the sensor is proportional to this ratio). Therefore, the magnet used to increase the resolution of the magnetic sensor is preferably as low as possible the strength of the magnetic field.
As gas is used in the diaphragm type gas meter, there is an additional part of the repetitive movement within a certain period, such as a crank rod or a diaphragm. Thus, for example, if a magnet is installed on the crank rod and the magnetic sensor is installed near one end of the movement section of the crank rod, the gas usage can be counted electrically as in the case of installing the magnet on the numeric wheel.
However, while using the gas meter and the pressure compensator, other magnets having higher magnetic force strength than the magnets mounted on the repetitive motion part (hereinafter, described by using a specific number wheel) as a specific number wheel or crank rod, etc. Approaching the meter's specific wheel around it distorts the magnetic field near it, causing errors in the readings of the magnetic sensor. In particular, attempts to intentionally attach a magnet with a very high magnetic force near that particular number wheel may interfere with the digitization of the magnetic sensor or impede the rotation of that particular number wheel so that the measured value of usage is lower than the actual amount used. Is doing well.
This disturbance may later be found at meter reading due to unusual variations in the gas consumption value indicated on the meter. Even so, in most cases, the magnets are already removed and no accurate evidence can be obtained. Cardiac disease does not have a physical condition to go. This can lead to price disputes between city gas suppliers and consumers. However, it is often not solved. This problem is a headache for city gas suppliers.
The present invention prevents the intentional approach of the disturbing magnet to cause magnetic field distortion in the automatic self-measurement of the gas consumption value of the diaphragm type gas meter, and when there is an attempt to low the amount of usage using the disturbing magnet, The aim is to ensure that evidence can be secured, effectively preventing charge disputes due to disturbing magnet access between city gas suppliers and consumers, and promoting reasonable resolution based on evidence in the event of a dispute.
According to a first preferred embodiment of the present invention for achieving the above object, in the diaphragm-type gas meter, the measurement is installed at a specific site that repeatedly performs a predetermined pattern of movement in accordance with the use of the gas and moves along with the specific site. In the magnetic gas consumption measuring device that specifies the gas usage by using a magnet,
At least one first magnetic sensor installed near a movement path of the measurement magnet and configured to detect a change in magnetic field strength according to the movement of the measurement magnet;
The disturbance magnet is installed at a predetermined position of the gas meter and has a lower sensitivity than the first magnetic sensor so that the output value does not change due to the fluctuation of the magnetic field formed by the measurement magnet, but causes the fluctuation of the magnetic field more than that of the measurement magnet. At least one second magnetic sensor whose output value changes when approaching;
A memory for storing data; And
Analyze the detection signal of the first magnetic sensor to calculate the number of times that the measurement magnet repeatedly approaches and retracts the first magnetic sensor to quantify gas consumption, and to detect the detection signal of the second magnetic sensor. An arithmetic unit which analyzes and determines whether an interference magnet is approaching and records the access history in the memory when there is an access;
In addition to counting the gas consumption using a magnetic signal, there is provided a magnetic gas consumption measuring apparatus having a function of monitoring the approach of a disturbing magnet causing magnetic field distortion.
According to a second preferred embodiment of the present invention for achieving the above object, in the diaphragm-type gas meter, the measurement is installed at a specific site which repeatedly performs a predetermined pattern of movement in accordance with the use of the gas and moves along with the specific site. In the magnetic gas consumption measuring device that specifies the gas usage by using a magnet,
At least one first magnetic sensor installed near a movement path of the measuring magnet and detecting an analog value of a peripheral magnetic field;
Analog-digital conversion means for sampling the analog detection value of the first magnetic sensor and converting the analog detection value into a digital value;
A memory for storing data; And
The maximum variation range of the converted digital value in the normal state without the magnetic field of the third disturbing magnet other than the measuring magnet is extracted and stored in the memory, and the analog value of the peripheral magnetic field detected by the first magnetic sensor is stored. It continuously analyzes and calculates the number of times that the measurement magnet is repeatedly approached and retracted by the measuring magnet to quantify the gas consumption, and if the situation occurs outside the maximum variation range in the analysis process, the disturbance occurs. A calculation unit for determining that the magnet has approached and writing the access history in the memory,
In addition to counting gas consumption using a magnetic signal, a magnetic gas consumption measuring device is provided that has a function of monitoring the approach of a disturbing magnet causing magnetic field distortion.
According to a third preferred embodiment of the present invention for achieving the above object, in the diaphragm-type gas meter, the measurement is provided at a specific site that repeatedly performs a predetermined pattern of movement in accordance with the use of the gas and moves together with the specific site. In the magnetic gas consumption measuring device that specifies the gas usage by using a magnet,
At least one first magnetic sensor installed near a movement path of the measurement magnet and configured to detect a change in magnetic field strength according to the movement of the measurement magnet;
At least one analog second magnetic sensor installed at a predetermined position of the gas meter and configured to detect a magnetic field of a third disturbing magnet instead of the measuring magnet;
Analog-digital conversion means for sampling the analog detection value of the second magnetic sensor and converting the analog detection value into a digital value;
A memory for storing data; And
The maximum variation range of the converted digital value in the steady state without the magnetic field of the disturbing magnet is extracted and stored in the memory, and the signal detected by the first magnetic sensor is continuously analyzed to detect the first magnetic field of the measurement magnet. The gas usage is measured by counting the number of times the approach and retreat to the sensor is repeated. In addition, if the situation is out of the maximum variation range by analyzing the magnitude of the detection signal of the second magnetic sensor, An operation unit for determining that the disturbance magnet has approached and recording the access history in the memory;
In addition to counting the gas consumption using a magnetic signal, there is provided a magnetic gas consumption measuring apparatus having a function of monitoring the approach of a disturbing magnet causing magnetic field distortion.
In the first to third embodiments, the measuring device preferably further comprises an alarm unit for issuing a predetermined alarm to which an alarm control signal is input. In that case, when it is determined that there is an approach of the disturbing magnet, the operation unit provides the alarm control signal to the alarm unit. And, once the alarm unit is issued an alarm, even if the disturbance magnet is removed, it is preferable to maintain the alarm state even if the authorized operator does not take a separate release action.
In the measuring apparatus according to the first embodiment, each of the first magnetic sensor and the second magnetic sensor outputs an off signal when the intensity of the detected magnetic field is smaller than a detection limit value, and outputs an on signal when the first magnetic sensor and the second magnetic sensor are larger. It is preferable that it is a type magnetic sensor. In addition, in the measuring apparatus according to the third embodiment, the first magnetic sensor corresponds to a digital magnetic sensor for outputting only two types of on and off signals according to the detected magnetic field intensity and the detected magnetic field intensity. It is preferable that it is any one of the analog magnetic sensors which output an analog value.
On the other hand, in the measuring device of the first to third embodiments, the operation unit, the temperature and pressure change of the gas in the process of performing a calculation to measure the gas consumption using the detection signal of the first magnetic sensor According to the present invention, it is preferable to also perform a process for correcting a temperature pressure error that may be included in the gas usage by measuring the shrinkage or expansion rate of the gas volume.
Further, in the measuring device of the first to third embodiments, the first magnetic sensor and the second magnetic sensor are composed of a single sensor module mounted on the same circuit board, and the single sensor module is connected to the gas meter. It is desirable that the seal be installed so that its traces remain when damaged.
In the measuring device of the first to third embodiments, the measuring magnet is preferably installed on a specific number wheel or a crank rod in the gas meter, which corresponds to a position less than the reading effective point of the gas usage indicator.
The present invention makes it possible to secure the fact as evidence when a disturbing magnet causing magnetic field distortion approaches when the gas consumption value of the diaphragm type gas meter is magnetically automatically metered. Therefore, it is possible to effectively prevent the rate disputes caused by the disturbing magnet approach between the city gas supplier and the consumer, and to establish a rational solution based on evidence in case of dispute.
1 is a view for explaining the configuration of the magnetic gas
As shown, in general, the
The operation of the diaphragm gas meter having such a configuration is performed as follows. The gas introduced into the
<First Embodiment>
The
At least one second
The first
3 is a block diagram showing the basic configuration of a magnetic gas consumption measuring apparatus according to a preferred embodiment of the present invention. The two
The first
The output signal of the first
Second Embodiment
On the other hand, a different method is possible. The magnetic sensor for detecting the rotation of the
The measuring
In the normal state in which the influence of the magnetic field by the third disturbing magnet other than the measuring
The
Third Embodiment
According to the principle similar to the second embodiment, there is a difference in that a magnetic sensor for detecting rotation of the measuring
The
In addition, the
In addition to the gas usage metering, the calculating
In each of the above embodiments, the
On the other hand, the apparatus of the first to third embodiments may be included as part of the on-pressure calibration apparatus, and Fig. 4 shows it. The
In order to correct the on-pressure error, the on-
In the above formula, P and T represent instantaneous pressure values and instantaneous temperature values, respectively.
The daily temperature error correction coefficient is determined by the average value of the total instantaneous temperature error correction coefficients calculated on the day, and the monthly temperature error correction coefficient is the total instantaneous temperature error correction coefficient calculated in the month or the total daily pressure error correction coefficients. The average value is set.
In addition, the
Further details regarding the correction of the temperature pressure error are well disclosed in Korean Patent Application No. 10-2005-0090356 (name of the invention: a temperature pressure error correction device for a capacitive city gas meter with an automatic meter reading function). It is intended that all of the disclosure herein be incorporated herein as part of the invention.
The present invention can be used for the automatic meter reading of the gas usage of the diaphragm type gas meter. When the auto-readed value is transmitted to the remote gas supplier's computer system, the auto-reader enables remote meter reading without the meter reading.
1 is a view for explaining the configuration of a magnetic gas consumption measuring apparatus according to a preferred embodiment of the present invention,
2 is a view showing in more detail the configuration of the
3 is a block diagram showing the basic configuration of the magnetic gas consumption measuring apparatus according to an embodiment of the present invention,
4 is a block diagram showing a configuration example in which the magnetic gas consumption measuring device according to the preferred embodiment of the present invention is integrated as part of the on-pressure compensating device.
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020080062048A KR20100001938A (en) | 2008-06-27 | 2008-06-27 | Magneto gas meter with a function of monitoring access of an interference magnet causing distortion of a magnetic field |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020080062048A KR20100001938A (en) | 2008-06-27 | 2008-06-27 | Magneto gas meter with a function of monitoring access of an interference magnet causing distortion of a magnetic field |
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Publication Number | Publication Date |
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KR20100001938A true KR20100001938A (en) | 2010-01-06 |
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KR1020080062048A KR20100001938A (en) | 2008-06-27 | 2008-06-27 | Magneto gas meter with a function of monitoring access of an interference magnet causing distortion of a magnetic field |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109846094A (en) * | 2019-03-08 | 2019-06-07 | 深圳市新宜康科技股份有限公司 | Inhalator generator and its control method based on magnetoresistive sensor |
WO2020006892A1 (en) * | 2018-07-02 | 2020-01-09 | 威海拙诚燃气安全设备有限公司 | On-line monitoring method for metering performance of diaphragm gas meter |
-
2008
- 2008-06-27 KR KR1020080062048A patent/KR20100001938A/en not_active Application Discontinuation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020006892A1 (en) * | 2018-07-02 | 2020-01-09 | 威海拙诚燃气安全设备有限公司 | On-line monitoring method for metering performance of diaphragm gas meter |
CN109846094A (en) * | 2019-03-08 | 2019-06-07 | 深圳市新宜康科技股份有限公司 | Inhalator generator and its control method based on magnetoresistive sensor |
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