KR20100001938A

KR20100001938A - Magneto gas meter with a function of monitoring access of an interference magnet causing distortion of a magnetic field

Info

Publication number: KR20100001938A
Application number: KR1020080062048A
Authority: KR
Inventors: 이병철
Original assignee: 이병철
Priority date: 2008-06-27
Filing date: 2008-06-27
Publication date: 2010-01-06

Abstract

PURPOSE: A magnetic device for measuring the amount of used gas is provided to compensate for error by sensing the access of an external interference magnet. CONSTITUTION: One or more first magnetic sensors(110) detect the change of magnetic field strength according to the motion of a measurement magnet(160). One or more second magnetic sensors(120) diversify the output with the access of a disturbance magnet. The disturbance magnet causes the change of the magnetic field which is stronger than the measurement magnet. A memory(180) stores data. An operation unit(170) measures the amount of used gas. The operation unit records the access history in the memory. The amount of used gas is counted according to the magnetic signal.

Description

Magnetic gas meter with a function of monitoring access of an interference magnet causing distortion of a magnetic field}

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 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 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 consumption measuring device 20 according to a preferred embodiment of the present invention, Figure 2 shows the configuration of the magnetic sensing device 100 shown in FIG. Drawing. The measuring device 20 has a basic function of measuring the gas consumption of the diaphragm type gas meter 10 in a magnetic manner, as well as magnetic field distortion in the region where gas consumption measuring means (magnet and magnetic sensor) are present. It also has the ability to monitor the approach of magnets (hereinafter referred to as 'interference magnets') that cause them.

As shown, in general, the upper casing 10 of the diaphragm type gas meter 1 is provided with two city gas entrance holes 11 and 12 at the top and a hole formed at the front center thereof to rotate through the hole. The butterfly shaft 13 is provided on the inside to enable it. In addition, the front portion of the upper casing 10 is provided with a display portion accommodating portion 15 for accommodating the display portion 30. In the lower casing 20, a diaphragm 22 fastened to the diaphragm bracket 23 is disposed at the center thereof, and a metering chamber 25 having a shape sealed to the outside by the diaphragm cover 21 is provided in front and rear, respectively. In addition, at the upper end of the lower casing 20, one side of the diaphragm bracket shaft 24 is fastened to the diaphragm bracket 23, and the other side is hinged to the crank rod 26 and the valve 27, and the right angle shaft Both ends of the 28 are hinged to the crank rod 26 and the right angle shaft bracket 29, respectively, and one end thereof contacts the butterfly shaft 13, so that the linear reciprocating motion of the crank rod 26 is rotated. A structure is provided that allows for conversion. The gas consumption display unit 30 is mounted in the internal space of the display unit accommodation unit 15. That is, the display part accommodating part 15 has a first gear 31 fastened to the other end of the butterfly shaft 13, and second and third gears 32 and 33 meshed with the first gear 31 to rotate. ) And the numerical wheel train 34 rotating in accordance with the rotation of the third gear 33 is mounted. And the display part cover 35 is fastened with the rim of the display part accommodating part 15, covering the numerical wheel train 34. As shown in FIG.

The operation of the diaphragm gas meter having such a configuration is performed as follows. The gas introduced into the inlet hole 11 flows back and forth through the diaphragm 22 while being respectively introduced into the front and rear measurement chamber 25 through a measurement chamber passage (not shown) formed under the valve 27. As a result, the diaphragm bracket 23 flows to rotate the diaphragm bracket shaft 24, and accordingly, the valve 27 and the crank rod 26 hinged to the diaphragm bracket shaft 24 respectively flow for a certain period. do. As the valve 27 flows a certain section from side to side, the metering chamber passage formed under the valve 27 is repeatedly opened and closed to control the gas flowing into the metering chamber 25 and discharged from the metering chamber 25. The gas is connected to the outlet hole 12 and discharged to the outside through an outlet passage (not shown) formed in the center of the lower casing 20. In this process, the crank rod 26 rotates a right angle shaft 28 hinged to both ends of the right angle shaft bracket 29. The rotational force of the right angle shaft 28 rotates the butterfly shaft 13 provided in the upper casing 10, and further, through the first gear 31, the second gear 32, and the third gear 33. The lowest number wheel 34a of the number wheel train 34 indicating gas consumption is rotated. The number wheel train 34 includes a plurality of number wheels, and adjacent number wheels are coupled to each other at a reduction ratio of 1:10. As a result, the flow rate of the gas passing through the gas meter 1 is displayed to the outside.

The gas meter 10 is further provided with a magnetic sensing device 100 to automatically digitize the gas usage. Since the gas consumption can be known by counting the rotational speed of the lowest number wheel 34a, the measurement magnet 160 made of permanent magnet is fixed to or interpolated on the outer surface of the lowest number wheel 34a. When measuring the gas consumption, any of the number wheels located below the effective digit (usually above the decimal point) may be positioned at the measurement magnet 160. The first magnetic sensor 110 for detecting the rotation of the measurement magnet 160 is fixed to a point closest to the measurement magnet 160 as close as possible among the rotation paths of the measurement magnet 160. For example, as shown, the number wheel train 34 is fixed to the right side of the upper surface of the storage box, just below the lowest number wheel 34a is disposed. In other positions, for example, other auxiliary fixing means (not shown) may be fixed to the position facing the lowest numeric wheel 34a on the surface of the display cover 35. The first magnetic sensor 110 may be juxtaposed two or more in order to achieve a more accurate measurement. The first magnetic sensor 110 uses a high sensitivity to respond to weak magnetic fields.

At least one second magnetic sensor 120 near the first magnetic sensor 110 that exhibits a change in output value only for a stronger magnetic field without changing the output value in the magnetic field generated by the measurement magnet 160 due to its low sensitivity. Install). The second magnetic sensor 120 has a function of monitoring the approach of the magnet causing distortion of the magnetic field near the first magnetic sensor 120. The monitoring second magnetic sensor 120 does not respond to changes in the magnetic field caused by the rotation of the measuring magnet 160 fixed to the lowest number wheel 34a, but has a higher magnetic force than the measuring magnet 160. This magnet is likely to be artificially installed in order to interfere with the rotation of the permanent magnet 160 or to interfere with the accuracy of digitizing of the first magnetic sensor 110. Since the magnetic field to be produced must be reacted, it is necessary to select an appropriate sensitivity.

The first magnetic sensor 110 may output an on signal when the measuring magnet 160 is closest and output an off signal when it is farthest away. Digital magnetic sensors are suitable because they output an off signal when the intensity of the magnetic field to be detected is less than the detection limit and an on signal when the magnetic field is larger. The second magnetic sensor 120 also uses a digital magnetic sensor that outputs an on signal if there is an approach of the disturbing magnet, and otherwise outputs an off signal. A reed switch, a hall sensor, a magneto-resistor sensor, or the like may be used as the first magnetic sensor 110 and the second magnetic sensor 120.

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 magnetic sensors 110 and 120 may use an analog magnetic sensor that outputs an analog signal having a size corresponding to the approaching distance of the measuring magnet 160 or the disturbing magnet (that is, the strength of the magnetic field of each magnet). . Of course, the output signal of the analog magnetic sensor is to be converted into a digital value through a sampling process to be provided to the operation unit 170. If the two magnetic sensors 110 and 120 do not have an analog-to-digital converter (ADC), the ADCs 112 and 114 are attached to the output terminals of the two magnetic sensors 110 and 120 to convert the output signals into digital values. Process.

The first magnetic sensor 110 and the second magnetic sensor 120 is preferably mounted on one printed circuit board 130 to form a single sensor module. In consideration of convenience of installation and device protection, it is preferable to install the sensor module in the sensor case 140. Opposing sides of the inlet of the sensor case 140 are provided with adhesive portions 140a and 140b having double-sided tapes to be used for fixing the sensor case 140. After installing the single sensor module of the first magnetic sensor 110 and the second magnetic sensor 120, it is preferable to perform a sealing process (not shown) on the display cover 35. This is to prevent the consumer from accessing or removing the sensor module without damaging the seal, and to leave a trace if such an action occurs.

The output signal of the first magnetic sensor 110 and the output signal of the second magnetic sensor 120 are provided to the operation alarm unit 170, respectively. The operation alarm unit 170 performs an operation of counting the number of revolutions of the measurement magnet 160 using the output signal of the first magnetic sensor 110. In parallel with this, an operation of monitoring the output signal of the second magnetic sensor 120 to determine whether access or attachment of the disturbing magnet occurs. When the approach of the disturbing magnet is detected, an alarm is issued through the alarm unit 190, and the fact of the disturbing magnet is recorded in the memory 180 together with the detection time. For example, the light emitting device and the speaker may be used as the alarm unit 190.

Second Embodiment

On the other hand, a different method is possible. The magnetic sensor for detecting the rotation of the measurement magnet 160 and the magnetic sensor for detecting the approach of the disturbing magnet are used in combination. Hereinafter, the use of these two purposes only with the first magnetic sensor 110 will be described by way of example.

The measuring magnet 160 is mounted on the moving part such as the lowest number wheel 34a as in the previous embodiment. The installation position of the first magnetic sensor 110 is installed near the movement path of the measuring magnet 160, and the number of installation is provided at least one. An analog magnetic sensor that detects an analog value of a peripheral magnetic field is used as the first magnetic sensor 110. Since the first magnetic sensor 110 will output the analog value in the form of an analog signal if the ADC is not built-in type, in this case, the ADC 112 is added to the output terminal and the analog detection signal is converted into a digital value by sampling. To be provided at 170. If the first magnetic sensor 110 is built-in ADC, the output data is directly provided to the operation unit 170.

In the normal state in which the influence of the magnetic field by the third disturbing magnet other than the measuring magnet 160 is not affected, the first magnetic sensor 110 may be affected only by the magnetic field of the measuring magnet 160. As the measurement magnet 160 repeatedly approaches and retracts (ie, rotates) the first magnetic sensor 110, the intensity of the magnetic field detected by the first magnetic sensor 110 is in a range of constant magnitude ( Fluctuation only within the maximum fluctuation range). The intensity of the detection signal of the first magnetic sensor 110 becomes the maximum value when the measurement magnet 160 approaches the first magnetic sensor 110 most closely, and becomes the minimum value when it retreats farthest. The range from the minimum value to the maximum value is the maximum variation range of the intensity of the detection signal of the first magnetic sensor 110. The calculation unit 170 extracts the maximum variation range through the magnitude analysis of the detection signal of the first magnetic sensor 110. The maximum fluctuation range may be secured by actual measuring in the field when the measuring device 20 of the present invention is installed in the gas meter 1. The maximum variation range secured is stored in the memory 180.

The operation unit 170 also continuously receives the detection signal of the first magnetic sensor 110, analyzes the pattern of change of the detection signal, and measures the number of repetitions in which the detection signal varies from the minimum value to the maximum value. The number of revolutions 160). In this process, the calculator 170 continuously monitors whether the magnitude of the detection signal of the first magnetic sensor 110 is out of the maximum variation range. If a situation out of the maximum fluctuation range occurs at any moment, the operation unit 170 determines that the cause is due to the approach or attachment of the disturbing magnet, and takes subsequent measures accordingly. That is, the alarm control signal is provided to the alarm unit 190 to generate an alarm, and the access history of the disturbed magnet in the memory 180, for example, the strength of the detected magnetic field (the intensity exceeding the maximum variation range) and the detection time. Take action to ensure that is stored.

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 magnet 160 and a magnetic sensor for detecting the approach of the disturbing magnet are separately employed. At least one magnetic sensor 110 for detecting the rotation of the measurement magnet 160 is installed, and the installation position or method is not different from the previous embodiment. A magnetic sensor that outputs only two types of on and off signals according to the detected magnetic field strength (that is, a digital magnetic sensor) and a magnetic sensor that outputs analog values corresponding to the magnetic field strength (that is, an analog magnetic sensor). Can be used as the magnetic sensor 110. As the magnetic sensor 120 for monitoring the approach of the disturbing magnet, at least one analog magnetic sensor is used.

The calculation unit 170 analyzes the magnitude of the detection signal of the second magnetic sensor 120 in the so-called normal state and extracts its maximum variation range. As mentioned above, the maximum variation range may be secured by actual measuring in the field when the measuring device 20 of the present invention is installed in the gas meter 1. The maximum variation range secured is stored in the memory 180.

In addition, the calculation unit 170 uses the detection signal of the first magnetic sensor 110 to count the number of revolutions of the measurement magnet 160 to measure the gas usage. That is, the calculation unit 170 continuously receives the detection signal of the first magnetic sensor 110, analyzes the change pattern of the detection signal, and measures the number of repetitions in which the detection signal changes from the minimum value to the maximum value. The number of revolutions 160).

In addition to the gas usage metering, the calculating unit 170 continuously monitors whether the magnitude of the detection signal of the second magnetic sensor is outside the maximum variation range. If a situation out of the maximum fluctuation range occurs at any moment, the operation unit 170 determines that the cause is due to the approach or attachment of the disturbing magnet, and the following actions such as alarm generation and memory storage as mentioned above. Take the

In each of the above embodiments, the alarm unit 190, once the alarm is issued, even if the disturbance magnet is removed so that the operator with a certain authority to maintain the alarm state unless a separate release action. The meter reader of the city gas supplier shall not be able to dismiss the alarm at the customer's discretion until the meter is read by the meter so that the reader can recognize that the meter has access to the disturbing magnet. The meter reader checks the state of the alarm unit 190 at the time of the meter reading and checks the access history (time and period, etc.) of the disturbing magnet in the memory 180 and secures it as evidence. The access history is used as evidence that the customer has operated the gas meter without permission, so that the gas supplier can effectively resolve the charge dispute with the customer.

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 calculation unit 170 counts the number of times of repeatedly approaching and retracting the first magnetic sensor 110 of the measuring magnet 160 using the detection signal of the first magnetic sensor 110 to automatically measure gas usage. The counted gas usage value may include a temperature pressure error of the gas volume according to the temperature and pressure change of the gas. Therefore, in the gas usage counting process, the contraction or expansion rate of the gas volume according to the temperature and pressure change of the gas is measured to compensate for the on-pressure error that may be included in the gas usage.

In order to correct the on-pressure error, the on-pressure compensator 200 measures the temperature of the city gas in the diaphragm-type gas meter 1 or the gas pipe 2 adjacent thereto, and converts it into an electric signal corresponding to the temperature value ( 210, a pressure measuring unit 220 which measures the pressure of the city gas in the gas meter 1 or the gas pipe 2 and converts it into an electrical signal corresponding to the pressure value, and counts the current time and provides the information. It includes a time measuring unit 240 to. The calculation unit 170 receives the measurement signals from the temperature measuring unit 210 and the pressure measuring unit 220 at each first predetermined time interval or whenever the amount of city gas usage reaches a predetermined value. Obtain the value of instantaneous pressure. And, using the instantaneous temperature value and the instantaneous pressure value, at least one of the instantaneous on-temperature error correction coefficient K _TP , the daily on-pressure error correction coefficient and the monthly on-pressure error correction coefficient is calculated. This is to compensate for the meter reading error that may be included in the metered value of the meter due to the difference between the instantaneous temperature value and the instantaneous pressure value and the reference temperature value and the reference pressure value applied when supplying the city gas. Here, the instantaneous on-pressure error correction coefficient K _TP is calculated by the following equation.

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 operation unit 170 receives the detection signals from the first and second magnetic sensors 110 and 120 at the same time, and uses the detection signals of the first magnetic sensors 110 to calculate daily or monthly gas consumption values. Count. In addition, the current time signal is received from the time measuring unit 240. The calculating unit 170 calculates the corrected daily gas consumption by multiplying the daily gas consumption value by the daily on-pressure error correction coefficient of the corresponding day. The monthly usage is calculated by accumulating the daily usage by month, or by calculating the corrected monthly usage by multiplying the monthly guide value by the monthly on-pressure error correction coefficient of the corresponding month.

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 magnetic sensing device 100 shown in FIG.

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

In a diaphragm type gas meter, a magnetic gas consumption measuring device for specifying a gas usage amount by using a measuring magnet which is installed at a specific part which repeatedly performs a predetermined pattern of movement in accordance with the use of a gas, and moves together with the specific part.

A memory for storing data; And

A magnetic gas consumption measuring device having a function of counting gas consumption by using a magnetic signal and monitoring the approach of a disturbing magnet causing magnetic field distortion.

A memory for storing data; And

According to any one of claims 1 to 3, It further comprises an alarm unit for generating a predetermined alarm, the alarm control signal is input,

And the calculation unit provides the alarm control signal to the alarm unit when it is determined that the disturbing magnet is approaching.

5. The magnetic gas according to claim 4, wherein the alarm unit keeps the alarm state even after the disturbance magnet is removed, even if the disturbance magnet is removed, unless an authorized operator performs a separate release action. Usage measuring device.

The magnetic sensor of claim 1, wherein each of the first magnetic sensor and the second magnetic sensor is a digital magnetic sensor that outputs an off signal when the detected magnetic field intensity is smaller than a detection limit value and outputs an on signal when the first magnetic sensor and the second magnetic sensor are smaller than the detection limit value. Magnetic gas consumption measuring device.

The digital magnetic sensor of claim 3, wherein the first magnetic sensor outputs only two types of ON and OFF signals according to the detected magnetic field strength, and an analog outputting analog value corresponding to the detected magnetic field strength. Magnetic gas consumption measuring device, characterized in that any one of the type magnetic sensor.

According to any one of claims 1 to 3, wherein the calculating unit, in the process of performing a calculation to calculate the gas consumption using the detection signal of the first magnetic sensor, according to the temperature and pressure change of the gas Magnetic gas consumption measuring device characterized in that for performing the process of correcting the pressure difference, which may be included in the gas consumption by measuring the shrinkage or expansion rate of the gas volume.

According to claim 1 or 3, wherein the first magnetic sensor and the second magnetic sensor is composed of a single sensor module mounted on the same circuit board, the single sensor module is sealed to the gas meter when damaged Magnetic gas consumption measuring device, characterized in that the trace is installed to remain.

3. The magnetic gas consumption measuring apparatus according to claim 2, wherein the first magnetic sensor is installed to seal the gas meter so as to leave a trace when it is damaged.

The magnetic magnet according to any one of claims 1 to 3, wherein the measuring magnet is installed on a specific number wheel or a crank rod in the gas meter, which corresponds to a position less than the meter effective point of the gas usage indicator. Gas consumption measuring device.