KR20000001533A - Flow compensation of flow measurer and management device thereof - Google Patents

Abstract

PURPOSE: A flow compensation of a flow measurer and the management device are provided to increase safety, decrease a gas interception caused by a mis-judgment and easily change a set value. CONSTITUTION: The flow compensation of the flow measurer and the management device comprise:a temperature compensation coefficient judging unit(4) compensating real passing gas amount and proper using amount according to an outside temperature and/or pressure in a gas meter; a pressure compensation coefficient judging unit(5); a flow amount compensating unit(6) compensating flow amount about temperature and pressure; a consumptive state memory unit(7); an error interception signal unit(14) for preventing gas intercepting by mis-operating; a proper gas using amount expectation unit(11); and an intercepting unit(13) intercepting gas if the gas using state is abnormal.

Description

Flow compensation and management device of flow meter

The present invention relates to a flow rate calibration and management device of the flow meter, and more particularly, by attaching a temperature sensor and a pressure sensor when measuring the gas flow rate to calculate the gas volume change according to the external temperature and pressure to the temperature and pressure during the flow measurement It reduces the errors caused by the gas, predicts the gas consumption by weather, and corrects the setpoint value by temperature and pressure, and shuts off the gas when it is judged that the gas appliance is used in a strange way. The present invention relates to an apparatus for compensating and managing a flow rate of a flow meter which makes it easy to reset the set value by resetting the set value.

In general, a gas meter with a built-in microcomputer to prevent a gas explosion accident and a function of blocking a gas when it is determined that a gas appliance is used in a strange manner or a live gas is being released from a change in the flow rate of the gas has been put to practical use.

Such a conventional gas meter with a safety function detects a change in the gas flow rate through the gas meter and assumes that a gas appliance with the capacity corresponding to the magnitude of the change has been ignited or extinguished and then continues for a predetermined time or over the maximum flow rate. When used, the gas supply is shut off.

However, the conventional gas meter having such a safety function has the problem indicated next. In other words, even if a microcomputer is built in, using the flow measuring means and the flow rate value of the existing diaphragm as it is, the error caused by the change of the gas volume due to the temperature and pressure change is not improved, and the gas in the region where the temperature change is severe throughout the year Although the consumption pattern of is significantly affected by the external temperature (for example, gas boilers, water heaters, etc. are mainly used in cold weather), even though the change of consumption is very large, the external temperature is not applied at all. There are many errors. In addition, some gas appliances used in Korea do not have a pressure regulating device, and the gas consumption varies greatly according to the pressure change, but the gas meter with the conventional safety function does not have a set value correction function. In some cases, the safety function may not be properly implemented due to the wide range of management.

In addition, even if the cutoff valve is operated and the supply of gas to the gas consumer is stopped, even if the cutoff valve is blocked due to an error in the operating condition setting value, the consumer cannot easily perform the recovery operation until the gas management staff takes care of it. There was an inconvenience to wait.

Therefore, the present invention is designed to secure such a conventional function, the flow rate passing through the gas meter is corrected with temperature and pressure information, predicts the consumption change by the external temperature, and limits the gas consumption due to the temperature and pressure change. The aim is to improve the safety function and reduce gas shutoff due to misjudgment, and to provide a flow compensator and management device for the flow meter to easily change the set value.

On the other hand, in order to achieve the above object, the present invention is a flow rate measuring unit for generating a signal corresponding to the amount of gas passing through the main pipe to which the gas is supplied, and a temperature measuring unit for sensing the temperature and outputs a signal accordingly; A temperature correction coefficient determining unit for determining a coefficient according to temperature correction by a signal input from the temperature measuring unit, a pressure measuring unit for detecting a gas pressure in the gas meter and outputting a signal according thereto, and outputting from the pressure measuring unit A pressure correction coefficient determining unit that determines a coefficient according to pressure correction by means of a signal, a corresponding correction data is inputted from the pressure correction coefficient determining unit, a temperature correction coefficient determining unit, and a flow rate measuring unit to determine the actual flow rate, and to determine predetermined correction data. Flow correction unit that outputs the data, and the consumption state unit that stores the data in an arbitrary time unit at the flow rate value determined by the flow correction unit. Section, an initial setting section for setting the proper use condition of gas to an initial value in advance, a setting value changing section for changing setting values by analyzing the setting information of the initial setting section and information of the consumption state storage section, and the setting value changing section A set value storage unit for storing the set value changed in the above, and the temperature correction coefficient determination unit and the pressure correction coefficient determination unit together with the set value stored in the set value storage unit are input, and the appropriate amount is estimated and outputted. A proper consumption determining unit which compares a signal inputted from the appropriate consumption predicting unit with a gas consumption signal from the flow rate correction unit, determines a proper consumption state, and outputs a predetermined control signal; As a result of the determination by the consumption determination section, it is determined that the abnormal use of the gas is made up of a cut-off section to cut off the gas supply by the output control signal Gong.

1 is a system block diagram of a flow rate information and management device showing an embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

1: flow measurement part 2: temperature measurement part

3: pressure measuring unit 4: temperature correction coefficient determination unit

5: pressure correction coefficient determination unit 6: flow correction unit

7: consumption state storage unit 8: initial setting unit

9: setting value changing section 10: setting value storage section

11: proper consumption estimation unit 12: proper consumption determination unit

13: blocking unit 14: error blocking signal unit

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the apparatus according to the present invention has a flow rate measuring part 1 generating a signal corresponding to the amount of gas passing through the main pipe to which gas is supplied, and a temperature sensing temperature and outputting a signal accordingly. The measurement unit 2, the temperature correction coefficient determination unit 4 which determines the coefficient according to the temperature correction by the signal input from the temperature measuring unit 2, and the gas pressure in the gas meter is sensed and the corresponding signal is detected. A pressure correction coefficient judging section 5 for judging a coefficient according to pressure correction by a pressure measuring section 3 to be output, a signal output from the pressure measuring section 3, and this pressure correction coefficient judging section 5 And a flow compensator 6 for receiving the corresponding signal from the temperature correction coefficient determining unit 4 and the flow measuring unit 1 to determine the actual flow rate and outputting predetermined correction data, and this flow compensating unit 6 According to the flow rate value determined in The initial setting unit 8 which sets the consumption state storage unit 7, the proper use condition of gas to an initial value in advance, the setting information of this initial setting unit 8, and the information of the consumption state storage unit 7 In the set value changing section 9 for changing the set value by analyzing the set value, the set value storing section 10 for storing the set value changed in the set value changing section 9, and the set value storing section 10. An appropriate amount estimating unit 11 for receiving the information of the temperature correction coefficient determining unit 4 and the pressure correction coefficient determining unit 5 together with the stored set value and estimating an appropriate amount of usage and outputting the information; An appropriate consumption determining unit 12 which compares the signal inputted from the predicting unit 11 with the gas consumption signal from the flow rate adjusting unit 6 to determine a proper consumption state and outputs a predetermined control signal, and the appropriate consumption As a result of the determination in the determination unit 12, the control scene which is determined to be abnormal gas use and outputted It consists of a blocking part 13 which cuts off a gas supply by a call.

In addition, the error blocking signal unit 14 is connected to the set value changing unit 9 so that when the gas is shut off and the blocking operation is caused by an error of the set value, the error blocking signal unit 14 can change the set value. Do it.

On the other hand, the operation of the device having such a configuration will be described as follows.

Normally, the gas meter has a membrane type in the gas supply pipe, and when the flow rate flows through the gas supply pipe, the membrane performs a linear reciprocating motion, converts it into disk motion, and places a magnet on the disk to calculate the number of pulses generated by the flow measurement unit ( Counter 1). At this time, the flow rate measured value Qt corresponding to the number of pulses countered by the flow rate measuring unit 1 is applied to the flow rate compensator 6. At this time, because the flow rate of the gas is measured in volume units, the volume of the gas is greatly affected by the temperature and pressure, but the error thereof is applied to the flow rate compensator 6 without being corrected.

In addition, the temperature is sensed by the temperature sensor in the temperature measuring unit 2, the detected signal is converted into a digital signal through the A / D converter and the signal is applied to the temperature correction coefficient determination unit (4). At this time, the temperature correction coefficient determination unit 4 calculates the volume change rate for each temperature based on the input temperature signal, and applies the temperature correction coefficient Tt to the flow rate correction unit 6. At the same time, the gas pressure in the gas meter is detected by the pressure sensor in the pressure measuring unit 3, and the detected signal is converted into a digital signal through the A / D converter, and the corresponding signal is applied to the pressure correction coefficient determining unit 5. . At this time, the pressure correction coefficient determination unit 5 calculates the input pressure signal as the volume change rate for each pressure, and applies the pressure correction coefficient Pt to the flow rate correction unit 6.

Therefore, the flow rate correction unit 6 is the flow rate measurement value (Qt) output from the flow rate measuring unit 1 and the temperature correction coefficient (Tt) and the pressure correction coefficient determination unit (5) output from the temperature correction coefficient determination unit (4) The corrected flow rate value Q can be obtained by analyzing the pressure correction coefficient Pt output from

That is, as shown in Equation 1 as an example of the temperature correction coefficient (Tt) calculation formula, it is the same as Equation 2 as an example of the pressure correction coefficient (Pt) calculation formula.

<Equation 1>

Tt = (reference temperature + 273) / (measurement temperature + 273) (temperature: ℃)

<Equation 2>

Pt = measured pressure / reference pressure (pressure: absolute pressure)

Therefore, the corrected flow rate value is calculated by Equation 3.

<Equation 3>

Q = Qt × Tt × Pt (flow rate at reference temperature and reference pressure)

Therefore, this corrected flow volume value Q becomes a flow volume value to which the volume change rate by temperature and pressure was applied. This can be useful for predicting when to replace the liquefied petroleum gas container by reducing the flow measurement error.

The value corrected by the flow rate correction section 6 is input to the consumption state storage unit 7. At this time, the consumption state storage unit 7 repeatedly stores and stores the input flow rate correction in unit time units t. It is used as a data for judging the change of usage during the unit time of.

On the other hand, the expected operation of the proper usage, which is the basis for the abnormal judgment based on the prediction of continuous use time, increase flow rate, and maximum flow rate, is as follows.

Usually, the main factors of gas consumption of gas users are gas boilers, water heaters, and gas stoves. In cold weather, gas consumption increases rapidly, and in hot weather, consumption decreases rapidly. Therefore, the temperature information detected from the temperature measuring unit 2 becomes important information for gas usage prediction.

That is, the appropriate usage estimating unit 11 uses the information of the set value storage unit 10 to use gas equipment (gas boiler, gas water heater, gas stove, etc.) associated with air temperature and gas equipment to be used regardless of the air temperature ( Gas stoves, gas ovens, etc.) can be expected.

For example, the maximum gas consumption of the gas boiler is G1, the maximum gas consumption of the gas stove is G2, and the maximum gas consumption of the gas stove is G3, as shown in Equation 4 below. ) Can be calculated.

<Equation 4>

GT = (G1 × Consumption Ratio g1) + (G2 × Consumption Ratio g2) + (G3 × Consumption Ratio g3)

That is, in cold weather, the gas consumption amount G1 of the gas boiler and the gas consumption amount G2 of the gas stove become higher, and in the hot weather, the proper amount of use is limited to the amount of microwave consumption gas. Then, the corrected use flow rate can be obtained by analyzing the temperature correction coefficient Tb output from the temperature correction coefficient determination unit 2 and the pressure correction coefficient Pb output from the pressure coefficient correction determination unit 3.

For example, an example of a temperature correction coefficient (Tb) calculation formula for the maximum flow rate (G) is shown in Equation 5, an example of the pressure correction coefficient (Pb) calculation formula is shown in Equation 6.

<Equation 5>

Tt = (measurement temperature +273) / (reference temperature + 273) (temperature: 0 ℃)

<Equation 6>

Pt = (measured pressure / reference pressure) ^3/2 (pressure: absolute pressure)

Therefore, the corrected maximum flow rate prediction is calculated by equation (7).

<Equation 7>

G = GT × Tb × Pb

In addition, the maximum continuous use time of the gas appliance can be obtained by an example of Equation 8 when there is almost no maximum flow rate fluctuation depending on the temperature.

<Equation 8>

Maximum continuous use time = Standard maximum continuous use time × Consumption rate gi

The above correction is performed in the titration usage estimating section 11, and the corrected value is applied to the titration consumption determiner 12 to determine whether the gas appliance is abnormally used. Also, correction for the increase flow rate is performed in the same manner as above.

On the other hand, the operation of changing the set value at the time of restoring the cut-off valve of the device is as follows.

Normally, in case of gas blocking by normal judgment, the blocking valve can be returned after removing the cause of blocking by gas management personnel, but in case of error blocking due to improper setting value, consumers take inconvenience until the arrival and adjustment of cause of blocking of gas management personnel. Should be. The present invention is a method that can reduce the human and time loss by allowing the consumer to directly adjust the set value and return to the cutoff when the set value is an error blocking due to inappropriate.

That is, the signal of the error blocking signal unit 14 is input to the setting value changing unit 9, where the setting value changing unit 9 is inputted from the consumption state memory unit 7 and the initial setting unit ( 8) the information is analyzed, and the set value is adjusted so that the error blocking is not repeated, the information is stored by the set value storage unit 10 and the stored set value information is applied to the proper usage estimating unit 11. Therefore, the proper usage estimating unit 11 can determine whether the current flow rate is appropriate consumption based on the changed set value inputted from the set value storage unit 10 and the information according to the temperature and the pressure.

The above detailed description of the present invention is a form for more preferably explaining the characteristics of the present invention, and the configuration and detailed combination thereof may be changed as long as the basic concept does not change, such as the claims claimed below. have.

As described above, the present invention calculates the gas volume change according to the change of temperature and pressure, which is the cause of measurement error of the conventional gas flow meter, and reduces the flow measurement error caused by the change of temperature and pressure, When predicting proper gas usage, when the gas appliance is judged to be used in a strange way, it provides a function to cut off the gas and improves the safety, and it is easy to reset the set value by a separate signal when restoring the blockage due to a set value error. It has the effect of making it work.

Claims (4)

The temperature correction coefficient determination unit 4 and / or the pressure correction coefficient determination unit 5 for correcting the amount of gas actually passed and the appropriate amount of use according to the external temperature and / or the pressure in the gas meter, and the flow rate for the temperature and pressure are corrected. The flow rate correction unit 6 for storing the gas flow rate at an arbitrary time interval, the error blocking signal unit 14 for preventing the gas blocking due to malfunction, and the limit condition for gas use Appropriate usage estimation unit 11, the flow rate correction and management device of the flow meter, characterized in that consisting of a shut-off unit 13 for shutting off the gas when the gas use state is abnormal. The flow rate correction unit (6) according to claim 1, wherein the temperature correction coefficient determination unit (4) determines the actual flow rate at the flow rate correction unit (6) by a signal input from the temperature measurement unit (2) that senses temperature and outputs a signal accordingly. The flow rate correction coefficient according to the temperature so as to correct the change in the gas consumption according to the temperature so that the proper amount estimating unit 11 can correct the predetermined flow rate correction coefficient Tt and the appropriate amount of usage. A flow rate calibration and management device for a flow meter, characterized in that for determining the coefficient and outputting a predetermined appropriate consumption correction coefficient (Tb, gi). The flow rate correction unit (6) according to claim 1, wherein the pressure correction coefficient determination unit (5) determines the actual flow rate in the flow rate correction unit (6) by a signal input from the pressure measurement unit (3) which senses the pressure and outputs a signal accordingly. The flow rate correction coefficient according to the pressure is determined so that the data can be outputted, and the change in gas consumption according to pressure can be corrected by the titration usage estimating unit 11. A flow rate calibration and management apparatus for a flow meter, characterized in that for determining a correction coefficient and outputting a predetermined appropriate consumption correction coefficient (Pb). 2. The consumption value storage unit (7) according to claim 1, wherein the consumption state storage unit (7) stores the data in arbitrary time units at the flow rate value determined by the flow rate correction unit (6), and the set value when the gas shutoff operation is caused by an error of the set value. An error interruption signal unit 14 for outputting a control signal to enable change, an initial setting unit 8 for setting appropriate use conditions of gas to an initial value in advance, and setting information and consumption state of the initial setting unit 8; A setting value changing section 9 capable of changing a setting value by a signal input from the error blocking signal section 14 by analyzing the information in the storage section 7, and a setting value changed in the setting value changing section 9; Flow rate calibration and management device of the flow meter, characterized in that consisting of a set value storage unit for storing the (10).