CN114964432A - Method for judging tiny leakage of intelligent diaphragm gas meter - Google Patents

Method for judging tiny leakage of intelligent diaphragm gas meter Download PDF

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Publication number
CN114964432A
CN114964432A CN202210902993.6A CN202210902993A CN114964432A CN 114964432 A CN114964432 A CN 114964432A CN 202210902993 A CN202210902993 A CN 202210902993A CN 114964432 A CN114964432 A CN 114964432A
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gas
differential pressure
time
value
time period
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CN114964432B (en
Inventor
石爱国
宋莎莎
徐伟
苏天宇
张天才
王颖嘉
傅建华
杨庆珍
李腾
康惠海
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Hangzhou Innover Technology Co ltd
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Hangzhou Innover Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
    • G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
    • 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
    • G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism

Abstract

The invention relates to a method for judging tiny leakage of an intelligent diaphragm type gas meter. The method is characterized in that a differential pressure sensor is arranged in the intelligent diaphragm gas meter, and a function model of the average differential pressure value and the flow in the revolution volume is established by utilizing a gas flow standard device; when the intelligent diaphragm gas meter is used, when the gas flow in the metering pulse falls in a judgment area of micro leakage of the intelligent diaphragm gas meter, the gas using behavior of a user in the pulse time is identified according to the change of the pressure difference value, the gas using time period is determined, the gas flow of the user in the gas using time period is obtained according to the functional relation between the average pressure difference value and the flow in the gas using time period, so that the gas using amount of the user in each gas using time period in the pulse time is obtained, the flow in a non-user gas using time period is accurately calculated, whether the micro leakage exists or not is judged according to the flow in the non-user gas using time period, and therefore false alarm of micro leakage caused by intermittent gas using behavior of residents is reduced.

Description

Method for judging tiny leakage of intelligent diaphragm gas meter
Technical Field
The invention relates to a method for judging tiny leakage of an intelligent diaphragm type gas meter.
Background
The safety of gas use is crucial to users, gas leakage is one of the largest safety risk sources in residents, the gas flow rate of the existing intelligent membrane gas meter is usually calculated by collecting time intervals of two continuous metering pulses and is compared with the normal gas flow rate, and when the flow rate calculated according to the time intervals of the two continuous metering pulses is different from the normal gas flow rate, the leakage is judged to exist. However, this solution has a problem that the intermittent gas consumption behavior of the residential user in a short time causes the gas consumption amount calculated according to the measurement pulse interval to fall in the flow determination region of the leakage of the gas meter, thereby causing a false alarm of the leakage of the intelligent diaphragm gas meter, and therefore, it is necessary to identify the normal gas consumption behavior of the user and reduce the false alarm.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a technical scheme of a method for judging tiny leakage of an intelligent diaphragm type gas meter.
The method for judging the tiny leakage of the intelligent diaphragm gas meter is characterized by comprising the following steps: installing a differential pressure sensor in the intelligent membrane type gas meter, wherein two gas pressure acquisition ports of the differential pressure sensor are respectively installed on the inner side and the outer side of a gas outlet guide pipe of the intelligent membrane type gas meter, and establishing a function model of an average differential pressure value and flow in a rotary volume by using a gas flow standard device; when the intelligent diaphragm gas meter is used, when the gas flow in the metering pulse falls in a judgment area of micro leakage of the intelligent diaphragm gas meter, the gas using behavior of a user in the pulse time is identified according to the change of the pressure difference value, the gas using time period is determined, the gas flow of the user in the gas using time period is obtained according to the functional relation between the average pressure difference value and the flow in the gas using time period, so that the gas using amount of the user in each gas using time period in the pulse time is obtained, the flow in a non-user gas using time period is accurately calculated, whether the micro leakage exists or not is judged according to the flow in the non-user gas using time period, and therefore false alarm of micro leakage caused by intermittent gas using behavior of residents is reduced.
The method for judging the tiny leakage of the intelligent diaphragm gas meter is characterized by comprising the following steps: the judgment of the tiny leakage comprises the following steps:
(1) establishing a function model of the average differential pressure value and the flow in the revolution volume by using a gas flow standard device, and (2) judging whether micro leakage exists.
The method for judging the tiny leakage of the intelligent diaphragm gas meter is characterized in that in the step (1), a gas flow standard device is utilized, and a method for establishing a function model of an average differential pressure value and flow in a revolution volume is as follows:
installing a differential pressure sensor in the intelligent membrane type gas meter, and detecting the pressure difference value between the inner side of a gas outlet guide pipe and the outer side of the gas outlet guide pipe of the intelligent membrane type gas meter through the differential pressure sensor; the gas flow standard device is utilized, different flows are sequentially introduced, average differential pressure value data in the rotation volume under different flows are obtained, and a function model is used for carrying out data fitting on the average differential pressure value data and the flows:
Figure 100002_DEST_PATH_IMAGE002
wherein
Figure 100002_DEST_PATH_IMAGE004
Which represents the average pressure difference value, is,
Figure 100002_DEST_PATH_IMAGE006
the flow rate is represented by the flow rate,
Figure 100002_DEST_PATH_IMAGE008
is a function model of the average differential pressure value and flow fitting;
the step (2) of judging whether the micro leakage exists is as follows:
step 1: sampling period for setting pressure sensor by microcontroller of intelligent diaphragm gas meter
Figure 100002_DEST_PATH_IMAGE010
Electromechanical conversion signal pulse equivalent
Figure 100002_DEST_PATH_IMAGE012
；
step 2: the microcontroller of the intelligent diaphragm gas meter acquires
Figure 100002_DEST_PATH_IMAGE014
Pulse signal, pulse time
Figure 100002_DEST_PATH_IMAGE016
，
Figure 100002_DEST_PATH_IMAGE018
Is the first
Figure 100002_DEST_PATH_IMAGE019
The end time of the pulse signal,
Figure 100002_DEST_PATH_IMAGE021
Is the first
Figure 100002_DEST_PATH_IMAGE022
At the start of pulse signal, the differential pressure sensor samples according to the sampling period
Figure 100002_DEST_PATH_IMAGE023
Obtaining the pressure difference value of the gas outlet of the intelligent membrane type gas meter and calculating the gas flow
Figure 100002_DEST_PATH_IMAGE025
，
Figure 100002_DEST_PATH_IMAGE027
When the gas flow rate
Figure 100002_DEST_PATH_IMAGE029
，
Figure 100002_DEST_PATH_IMAGE031
Is to judge the lower limit value of the micro-leakage gas flow,
Figure 100002_DEST_PATH_IMAGE033
if yes, executing step 3; when the gas flow rate
Figure 100002_DEST_PATH_IMAGE035
When, there is no micro-leakage;
step 3: first, the
Figure 100002_DEST_PATH_IMAGE036
A start time of the pulse signal
Figure 397695DEST_PATH_IMAGE021
Has previously acquired
Figure 100002_DEST_PATH_IMAGE038
Differential pressure value, pulse time
Figure 100002_DEST_PATH_IMAGE040
Therein is provided with
Figure 100002_DEST_PATH_IMAGE042
A differential pressure value, then
Figure 100002_DEST_PATH_IMAGE044
、
Figure 100002_DEST_PATH_IMAGE046
、…、
Figure 100002_DEST_PATH_IMAGE048
，
Figure 100002_DEST_PATH_IMAGE049
Is the first
Figure 100002_DEST_PATH_IMAGE051
The difference value of the pressure difference is calculated,
Figure 100002_DEST_PATH_IMAGE052
is the first
Figure 100002_DEST_PATH_IMAGE054
A differential pressure value of …,
Figure 100002_DEST_PATH_IMAGE055
Is the first
Figure 100002_DEST_PATH_IMAGE057
And (3) calculating the ratio of the pressure difference values at adjacent sampling moments: if the current sampling time pressure difference value
Figure 100002_DEST_PATH_IMAGE059
，
Figure 100002_DEST_PATH_IMAGE061
Indicating the minimum differential pressure value to which the deviation term should be added
Figure 100002_DEST_PATH_IMAGE063
Calculating the ratio of the pressure difference values of adjacent sampling moments, and recording the ratio as
Figure 100002_DEST_PATH_IMAGE065
（
Figure 100002_DEST_PATH_IMAGE067
）、
Figure 100002_DEST_PATH_IMAGE069
（
Figure 100002_DEST_PATH_IMAGE071
）、
Figure 100002_DEST_PATH_IMAGE073
（
Figure 100002_DEST_PATH_IMAGE075
）、…、
Figure 100002_DEST_PATH_IMAGE077
（
Figure 100002_DEST_PATH_IMAGE079
) (ii) a If the current sampling time pressure difference value
Figure 100002_DEST_PATH_IMAGE081
The ratio of the differential pressure values at adjacent sampling moments is recorded as
Figure 100002_DEST_PATH_IMAGE083
、
Figure 100002_DEST_PATH_IMAGE085
、
Figure 100002_DEST_PATH_IMAGE087
、…、
Figure 100002_DEST_PATH_IMAGE089
(ii) a When a user just starts to use gas, the differential pressure value fluctuates and shows an increasing trend, and when the user stops using the gas, the differential pressure value is reduced; if pulse time
Figure 100002_DEST_PATH_IMAGE090
The ratio of each differential pressure value satisfies
Figure 100002_DEST_PATH_IMAGE092
、
Figure 100002_DEST_PATH_IMAGE094
、
Figure 100002_DEST_PATH_IMAGE096
、…、
Figure 100002_DEST_PATH_IMAGE098
，
Figure 100002_DEST_PATH_IMAGE100
Is the minimum threshold value of the differential pressure value ratio,
Figure 100002_DEST_PATH_IMAGE102
Is the maximum threshold value of the differential pressure value ratio, and illustrates the pulse time
Figure 100002_DEST_PATH_IMAGE040A
The inner user has no gas using behavior and has a tiny leakage condition; if pulse time
Figure 100002_DEST_PATH_IMAGE103
The ratio of the internal differential pressure value to the differential pressure value is
Figure 100002_DEST_PATH_IMAGE105
The condition or the ratio of the differential pressure values of
Figure 100002_DEST_PATH_IMAGE107
To illustrate the user's active behavior during this time, step4 is executed;
step 4: determining the time period for using the air by the user according to the ratio of the pressure difference values, wherein the ratio of the pressure difference values is determined when the air is used
Figure 100002_DEST_PATH_IMAGE108
In the case of (3), the time of obtaining a large differential pressure value is taken as the starting point of the gas consumption of the user, and if the differential pressure value ratios after the starting point of the gas consumption are all equal
Figure 100002_DEST_PATH_IMAGE110
When the user continuously uses the gas, the end time of the pulse signal is taken as the gas using end point, and if the ratio of the pressure difference value after the gas using start point of the user is the ratio
Figure 100002_DEST_PATH_IMAGE111
Taking the obtaining time of the smaller differential pressure value as the gas utilization end point; when only the ratio of the differential pressure values
Figure 100002_DEST_PATH_IMAGE112
In the case of a small differential pressure valueThe obtained time is used as the gas utilization end point, and the pressure difference value ratios before the gas utilization end point are all larger than the minimum threshold value of the pressure difference value ratio
Figure 100002_DEST_PATH_IMAGE113
And is less than the maximum threshold of the differential pressure value ratio
Figure 100002_DEST_PATH_IMAGE114
During the time period, the user always uses the gas, which occurs at the starting time of the pulse signal, so that the starting time of the pulse signal is used as the starting point of the gas usage; calculating the gas consumption in each gas consumption time period of the user, and describing the gas consumption in a single gas consumption time period, wherein the pressure difference value in the gas consumption time period is
Figure 100002_DEST_PATH_IMAGE116
、
Figure 100002_DEST_PATH_IMAGE118
、…、
Figure 100002_DEST_PATH_IMAGE120
，
Figure 100002_DEST_PATH_IMAGE121
Is the first
Figure 100002_DEST_PATH_IMAGE123
A differential pressure value, also denoted as the 1 st differential pressure value in the gas usage period,
Figure 100002_DEST_PATH_IMAGE124
is the first
Figure 100002_DEST_PATH_IMAGE126
The pressure difference value, which also represents the 2 nd pressure difference value in the gas usage period,
Figure 100002_DEST_PATH_IMAGE127
is the first
Figure 100002_DEST_PATH_IMAGE129
A differential pressure value, also representing the last differential pressure value in the gas usage time period; there are specifically three cases: the first case being the ratio of the differential pressure values
Figure 100002_DEST_PATH_IMAGE130
The gas using behavior is continuous gas using, and the pressure difference value ratios after the starting point of gas using are all
Figure 100002_DEST_PATH_IMAGE131
Up to the first
Figure DEST_PATH_IMAGE036A
End time of pulse signal
Figure 100002_DEST_PATH_IMAGE132
The gas using time of the gas using time period
Figure DEST_PATH_IMAGE134
(ii) a In the second case, the ratio of the pressure difference values
Figure 100002_DEST_PATH_IMAGE135
And the ratio of the pressure difference value after the start point of gas use exists
Figure 100002_DEST_PATH_IMAGE136
Condition of (2), i.e. differential pressure value
Figure DEST_PATH_IMAGE138
The time of acquisition is the end point of the gas consumption of the user, the differential pressure value
Figure 100002_DEST_PATH_IMAGE139
The acquisition time is the starting point of the gas consumption of the user, and the gas consumption time of the gas consumption time period
Figure DEST_PATH_IMAGE141
(ii) a The third case is when the ratio of only the magnitude of the pressure difference has
Figure 100002_DEST_PATH_IMAGE142
Condition (d), differential pressure value
Figure 100002_DEST_PATH_IMAGE143
The obtaining time is the end point of the gas usage of the user, and the pressure difference value ratios before the end point of the gas usage are all larger than the minimum threshold value of the pressure difference value ratios
Figure 100002_DEST_PATH_IMAGE144
And is less than the maximum threshold of the differential pressure value ratio
Figure 100002_DEST_PATH_IMAGE145
To a first order
Figure 100002_DEST_PATH_IMAGE146
Start time of pulse signal
Figure 513394DEST_PATH_IMAGE021
As the starting point of gas utilization, the gas utilization time of the gas utilization time period
Figure DEST_PATH_IMAGE148
(ii) a Average pressure difference value in the gas using period
Figure DEST_PATH_IMAGE150
And obtaining the gas flow rate in the gas using time period according to the function relation between the average pressure difference value and the flow rate
Figure DEST_PATH_IMAGE152
The gas consumption of the gas consumption time period
Figure DEST_PATH_IMAGE154
(ii) a When present, is
Figure DEST_PATH_IMAGE156
During the period of using gas, the gas using time is
Figure DEST_PATH_IMAGE158
The average pressure difference value of the gas using time period of (2) is
Figure DEST_PATH_IMAGE160
The gas flow rate is
Figure DEST_PATH_IMAGE162
Gas consumption in gas consumption time period
Figure DEST_PATH_IMAGE164
…, the gas consumption time is
Figure DEST_PATH_IMAGE166
Time period of gas use of, average pressure difference value of
Figure DEST_PATH_IMAGE168
With a gas flow of
Figure DEST_PATH_IMAGE170
Gas consumption in gas consumption time period
Figure DEST_PATH_IMAGE172
At this time, the flow rate in the period of non-gas use
Figure DEST_PATH_IMAGE174
Flow rate during periods when the user is not using gas
Figure DEST_PATH_IMAGE176
Satisfy the requirement of
Figure DEST_PATH_IMAGE178
Indicating the presence of a small leak; flow rate in non-gas-using time period of user
Figure 100002_DEST_PATH_IMAGE179
Satisfy the requirement of
Figure DEST_PATH_IMAGE181
No micro-leakage is indicated.
The invention installs a differential pressure sensor in the intelligent diaphragm gas meter, and the differential pressure sensor can detect the pressure difference value between the inner side of the gas outlet guide pipe and the outer side of the gas outlet guide pipe of the gas meter; by utilizing a gas flow standard device and a data fitting method, a functional relation between the differential pressure value and the flow can be established; when the intelligent membrane type gas meter is used, the gas using behavior of a user can be identified through the change of the differential pressure value, for example, the starting point and the end point of the gas using are determined by the differential pressure value ratio at adjacent sampling moments; when the gas flow in the metering pulse falls in a judgment area of micro leakage of the intelligent diaphragm gas meter, whether intermittent gas using behaviors of a user exist in the pulse time is identified according to the change of the differential pressure value, when the gas using behaviors of the user exist, the gas using amount in a gas using time period can be obtained based on the functional relation between the differential pressure value and the flow, then the flow in a non-user gas using time period is obtained, and whether the micro leakage exists is judged according to the flow value, so that false alarms caused by the intermittent gas using behaviors of the user are reduced.
Detailed Description
The invention discloses a method for judging tiny leakage of an intelligent diaphragm gas meter, which is characterized in that a differential pressure sensor is arranged in the intelligent diaphragm gas meter, two gas pressure acquisition ports of the differential pressure sensor are respectively arranged on the inner side and the outer side of a gas outlet guide pipe of the intelligent diaphragm gas meter, and a function model of an average differential pressure value and flow in a revolution volume is established by utilizing a gas flow standard device; when the gas meter is used, when the gas flow in the metering pulse falls in a judgment area of micro leakage of the intelligent membrane gas meter, the gas using behavior of a user in the pulse time is identified according to the ratio of the pressure difference values of adjacent sampling periods, the gas using time period is determined, the gas flow in the gas using time period is obtained according to the function relation between the average pressure difference value and the flow in the gas using time period, so that the gas using amount of each gas using time period in the pulse time is obtained, the flow in the non-user gas using time period is accurately calculated, whether the micro leakage exists or not is judged according to the flow in the non-user gas using time period, and therefore misjudgment of the intermittent gas using behavior of the user on the micro leakage is reduced.
The judgment of the tiny leakage comprises the following steps:
(1) establishing a function model of the average differential pressure value and the flow in the revolution volume by using a gas flow standard device
Installing a differential pressure sensor in the intelligent membrane type gas meter, and detecting the pressure difference value of the inner side and the outer side of a gas outlet guide pipe of the gas meter through the differential pressure sensor; utilize gas flow standard device, let in the flow in proper order, intelligent diaphragm type gas table rotating member motion for the constantly undulant of the pressure differential value of intelligent diaphragm type gas table gas outlet, and can be along with the reciprocating motion of rotating member, the pressure differential value demonstrates periodicity, and simultaneously, a reciprocating motion of rotating member shows to accomplish a gyration volume for intelligent diaphragm type gas table and advances to exhaust, consequently carries out data fitting with average differential pressure value data and flow under the different flow in the gyration volume:
Figure 100002_DEST_PATH_IMAGE182
wherein
Figure DEST_PATH_IMAGE183
Which represents the average pressure difference value, is,
Figure DEST_PATH_IMAGE184
the flow rate is represented by the flow rate,
Figure DEST_PATH_IMAGE185
is a function model of the mean differential pressure value and flow fitting. Function(s)
Figure DEST_PATH_IMAGE187
Can be
Figure DEST_PATH_IMAGE189
，
Figure DEST_PATH_IMAGE191
、
Figure DEST_PATH_IMAGE193
、
Figure DEST_PATH_IMAGE195
Is the average differential pressure value and the flow rate according to
Figure DEST_PATH_IMAGE197
And (5) carrying out coefficient obtained by data fitting.
In this embodiment, a G4 intelligent diaphragm gas meter is selected, a differential pressure sensor is installed in the intelligent diaphragm gas meter, two gas pressure acquisition ports of the differential pressure sensor are respectively installed on the inner side and the outer side of a gas outlet guide pipe of the intelligent diaphragm gas meter, and a sound velocity nozzle type gas meter inspection device is adopted, and the relationship between the flow rate and the average differential pressure value in the revolution volume is shown in the following table.
Figure DEST_PATH_IMAGE199
As can be seen from the above table, when the flow rate is 0.016m 3 H, the mean differential pressure is 55.85Pa, when the flow rate is 0.04 m 3 The average pressure difference value is 58.03Pa, and the flow range is (1.6-2.8) m 3 At the time of/h, the average differential pressure value is (82-111) Pa, and the change of the average differential pressure value is not large in the visible small flow range. In addition, the ratio of the pressure difference values at adjacent sampling moments is analyzed, and the range of the pressure difference value ratio is (0.7-1.2). In this embodiment, the selection is made
Figure DEST_PATH_IMAGE201
The function model carries out data fitting on the average differential pressure value and the flow to obtain
Figure DEST_PATH_IMAGE203
。
(2) The steps of judging whether the micro leakage exists are as follows:
step 1: sampling period for setting pressure sensor by microcontroller of intelligent diaphragm gas meter
Figure DEST_PATH_IMAGE204
Electromechanical conversion signal pulse equivalent
Figure DEST_PATH_IMAGE205
。
step 2: the microcontroller of the intelligent diaphragm gas meter acquires
Figure DEST_PATH_IMAGE206
Pulse signal, pulse time
Figure DEST_PATH_IMAGE207
，
Figure DEST_PATH_IMAGE208
Is the first
Figure DEST_PATH_IMAGE209
The end time of the pulse signal,
Figure 456596DEST_PATH_IMAGE021
Is the first
Figure DEST_PATH_IMAGE210
At the start of pulse signal, the differential pressure sensor samples according to the sampling period
Figure DEST_PATH_IMAGE204A
Obtaining the pressure difference value of the gas outlet of the intelligent membrane type gas meter and calculating the gas flow
Figure DEST_PATH_IMAGE211
，
Figure DEST_PATH_IMAGE212
When the gas flow rate
Figure DEST_PATH_IMAGE213
，
Figure DEST_PATH_IMAGE214
Is to judge the lower limit value of the micro-leakage gas flow,
Figure DEST_PATH_IMAGE215
if yes, executing step 3; when the gas flow rate
Figure DEST_PATH_IMAGE217
When it is, it indicates no micro-leakage.
step 3: first, the
Figure DEST_PATH_IMAGE036AA
A start time of the pulse signal
Figure 46102DEST_PATH_IMAGE021
Has previously collected
Figure DEST_PATH_IMAGE218
Differential pressure value, pulse time
Figure DEST_PATH_IMAGE219
Therein is provided with
Figure DEST_PATH_IMAGE220
A differential pressure value, then
Figure DEST_PATH_IMAGE221
、
Figure DEST_PATH_IMAGE222
、…、
Figure DEST_PATH_IMAGE223
，
Figure DEST_PATH_IMAGE224
Is the first
Figure DEST_PATH_IMAGE225
The difference value of the pressure difference is calculated,
Figure DEST_PATH_IMAGE226
is the first
Figure DEST_PATH_IMAGE227
A differential pressure value of …,
Figure DEST_PATH_IMAGE228
Is the first
Figure DEST_PATH_IMAGE229
And (3) calculating the ratio of the pressure difference values at adjacent sampling moments: if the user does not use gas for a long time, the pressure difference value is small and is influenced by the pressure fluctuation of the gas pipeline and the like, the pressure difference value also fluctuates, and therefore the gas consumption device is used for supplying gas for a long timeWhen the value of the differential pressure value is less than the minimum differential pressure value
Figure DEST_PATH_IMAGE230
The pressure difference values of adjacent sampling moments should be added with deviation terms
Figure DEST_PATH_IMAGE231
To calculate the ratio of the differential pressure values, and record
Figure DEST_PATH_IMAGE232
（
Figure DEST_PATH_IMAGE233
）、
Figure DEST_PATH_IMAGE234
（
Figure DEST_PATH_IMAGE235
）、
Figure DEST_PATH_IMAGE236
（
Figure DEST_PATH_IMAGE237
）、…、
Figure DEST_PATH_IMAGE238
（
Figure DEST_PATH_IMAGE239
) (ii) a If the current sampling time pressure difference value
Figure DEST_PATH_IMAGE240
The ratio of the differential pressure values at adjacent sampling moments is recorded as
Figure DEST_PATH_IMAGE241
、
Figure DEST_PATH_IMAGE242
、
Figure DEST_PATH_IMAGE243
、…、
Figure DEST_PATH_IMAGE244
(ii) a When the user just begins to use the gas, the differential pressure value fluctuates at the moment and shows an increasing trend, and when the user stops using the gas, the differential pressure value is reduced. If pulse time
Figure DEST_PATH_IMAGE245
The ratio of each differential pressure value satisfies
Figure DEST_PATH_IMAGE246
、
Figure DEST_PATH_IMAGE247
、
Figure DEST_PATH_IMAGE248
、…、
Figure DEST_PATH_IMAGE249
，
Figure DEST_PATH_IMAGE250
Is the minimum threshold value of the differential pressure value ratio,
Figure DEST_PATH_IMAGE251
Is the maximum threshold value of the differential pressure value ratio, and illustrates the pulse time
Figure DEST_PATH_IMAGE252
The inner user has no gas using behavior and has a tiny leakage condition; if pulse time
Figure DEST_PATH_IMAGE253
The ratio of the internal differential pressure value to the differential pressure value is
Figure DEST_PATH_IMAGE135A
The condition or the ratio of the differential pressure values of
Figure DEST_PATH_IMAGE254
Illustrating the user's active behavior during this time, step4 is performed.
step 4: determining the time period for using the air by the user according to the ratio of the pressure difference values, wherein the ratio of the pressure difference values is determined when the air is used
Figure DEST_PATH_IMAGE255
In the case of (3), the time of obtaining a large differential pressure value is taken as the starting point of the gas consumption of the user, and if the differential pressure value ratios after the starting point of the gas consumption are all equal
Figure DEST_PATH_IMAGE110A
When the user continuously uses the gas, the end time of the pulse signal is taken as the gas using end point, and if the ratio of the pressure difference value after the gas using start point of the user is the ratio
Figure DEST_PATH_IMAGE256
Taking the acquisition time of the smaller differential pressure value as the gas utilization end point; when the ratio of the differential pressure values alone is
Figure DEST_PATH_IMAGE257
The time when the small pressure difference value is obtained is used as the gas use end point, and the pressure difference value ratios before the gas use end point are all larger than the minimum threshold value of the pressure difference value ratio
Figure DEST_PATH_IMAGE144A
And is less than the maximum threshold of the differential pressure value ratio
Figure DEST_PATH_IMAGE258
During the time period, the user always uses the gas, which occurs at the starting time of the pulse signal, so that the starting time of the pulse signal is used as the starting point of the gas usage; calculating the gas consumption in each gas consumption time period of the user, and describing the gas consumption in a single gas consumption time period, wherein the pressure difference value in the gas consumption time period is
Figure DEST_PATH_IMAGE259
、
Figure DEST_PATH_IMAGE260
、…、
Figure DEST_PATH_IMAGE261
，
Figure DEST_PATH_IMAGE262
Is the first
Figure DEST_PATH_IMAGE263
A differential pressure value, also denoted as the 1 st differential pressure value in the gas usage period,
Figure DEST_PATH_IMAGE264
is the first
Figure DEST_PATH_IMAGE265
The differential pressure value, also denoted as the 2 nd differential pressure value in the gas usage period,
Figure DEST_PATH_IMAGE266
is the first
Figure DEST_PATH_IMAGE267
The pressure differential value also represents the last pressure differential value in the gas usage period.
There are specifically three cases: the first case being the ratio of the differential pressure values
Figure DEST_PATH_IMAGE268
The gas using behavior is continuous gas using, and the pressure difference value ratios after the starting point of gas using are all
Figure DEST_PATH_IMAGE269
Up to the first
Figure DEST_PATH_IMAGE270
The end time of the pulse signal
Figure DEST_PATH_IMAGE271
The gas using time of the gas using time period
Figure DEST_PATH_IMAGE272
(ii) a In the second case, the ratio of the pressure difference values
Figure DEST_PATH_IMAGE273
And the ratio of the differential pressure value after the start of gas use exists
Figure DEST_PATH_IMAGE142A
Condition of (2), i.e. differential pressure value
Figure DEST_PATH_IMAGE274
The time of acquisition is the end point of the gas consumption of the user, the differential pressure value
Figure DEST_PATH_IMAGE275
The acquisition time is the starting point of the gas consumption of the user, and the gas consumption time of the gas consumption time period
Figure DEST_PATH_IMAGE141A
(ii) a The third case is when the ratio of only the magnitude of the pressure difference has
Figure DEST_PATH_IMAGE276
Condition (d), differential pressure value
Figure DEST_PATH_IMAGE277
The obtaining time is the end point of the gas usage of the user, and the pressure difference value ratios before the end point of the gas usage are all larger than the minimum threshold value of the pressure difference value ratios
Figure DEST_PATH_IMAGE278
And is less than the maximum threshold of the differential pressure value ratio
Figure DEST_PATH_IMAGE279
By the first step
Figure DEST_PATH_IMAGE280
Start time of pulse signal
Figure DEST_PATH_IMAGE282
As the starting point of gas utilization, the gas utilization time of the gas utilization time period
Figure DEST_PATH_IMAGE283
(ii) a Average differential pressure value in the gas consumption period
Figure DEST_PATH_IMAGE284
And obtaining the gas flow rate in the gas consumption time period according to the function relation between the average differential pressure value and the flow rate
Figure DEST_PATH_IMAGE285
The gas consumption of the gas consumption time period
Figure DEST_PATH_IMAGE286
(ii) a When present
Figure DEST_PATH_IMAGE287
In the individual gas consumption time period, the gas consumption time is
Figure DEST_PATH_IMAGE288
The average pressure difference value of the gas using time period of (2) is
Figure DEST_PATH_IMAGE289
The gas flow rate is
Figure DEST_PATH_IMAGE290
Gas consumption in gas consumption time period
Figure DEST_PATH_IMAGE291
…, the gas consumption time is
Figure DEST_PATH_IMAGE292
Time period of gas use of, average pressure difference value of
Figure DEST_PATH_IMAGE293
The gas flow rate is
Figure DEST_PATH_IMAGE294
Gas consumption in gas consumption time period
Figure DEST_PATH_IMAGE295
At this time, the flow rate in the period of non-gas use
Figure DEST_PATH_IMAGE296
When is coming into contact withUser non-gas time period flow
Figure DEST_PATH_IMAGE297
Satisfy the requirement of
Figure DEST_PATH_IMAGE298
Indicating the presence of a small leak; flow rate in non-gas-using time period of user
Figure DEST_PATH_IMAGE299
Satisfy the requirement of
Figure DEST_PATH_IMAGE300
No micro-leakage is indicated.
In the step1-step4 for judging the micro-leakage, the microcontroller of the intelligent diaphragm gas meter sets the sampling period of the pressure sensor in consideration of the problem of power consumption
Figure DEST_PATH_IMAGE301
1 s/time, the electromechanical conversion signal pulse equivalent of the intelligent diaphragm gas meter
Figure DEST_PATH_IMAGE205A
Is 0.01m 3 The initial flow rate of the G4-grade intelligent diaphragm gas meter is 0.005m 3 And h, when the intelligent diaphragm gas meter reaches a set value in the flow continuous flowing time which is less than 2 times of the initial flow, the intelligent diaphragm gas meter needs to give a leakage alarm, so that the lower limit value of the micro leakage gas flow is set
Figure DEST_PATH_IMAGE302
Is 0.005m 3 H, upper limit of minute leakage gas flow
Figure DEST_PATH_IMAGE303
Is 0.01m 3 H is used as the reference value. When the gas flow in the metering pulse falls to 0.005m 3 /h，0.01 m 3 /h]And in the meantime, the ratio of the pressure difference values of adjacent sampling periods is used for identifying the gas using behavior of the user in the pulse time. If the user does not use gas for a long time, the pressure difference value is small and is influenced by the pressure fluctuation of the gas pipeline and the like, the pressure difference value also fluctuates, and therefore, when the gas is not used for a long time, the gas is used for supplying gas for a long timeThe value of the differential pressure value is less than the minimum differential pressure value
Figure DEST_PATH_IMAGE304
The pressure difference value of adjacent sampling time should be added with deviation term
Figure DEST_PATH_IMAGE305
To calculate the ratio of the differential pressure values, the minimum differential pressure value in this embodiment
Figure DEST_PATH_IMAGE306
Is 10Pa, deviation term
Figure DEST_PATH_IMAGE307
5Pa is taken. Referring to the experimental data of the G4 intelligent diaphragm gas meter, the minimum threshold value of the pressure difference value ratio
Figure DEST_PATH_IMAGE308
Maximum threshold value of 0.4, differential pressure value ratio
Figure DEST_PATH_IMAGE309
1.8 is taken.
In summary, the differential pressure sensor is installed in the intelligent diaphragm gas meter, and the gas using behavior of the user is identified through the change characteristics of the differential pressure value; when the micro leakage of the intelligent diaphragm type gas meter is judged, in order to reduce false alarm caused by intermittent gas use behaviors of residents, a pulse time period is divided into a plurality of gas use time periods and non-gas use time periods according to the ratio of a pressure difference value, the gas consumption of each gas use time period is obtained on the basis of the functional relation between the pressure difference value and the flow, then the flow in the non-user gas use time periods is obtained, and whether the micro leakage exists or not is judged according to the flow value, so that the false alarm rate of the micro leakage of the intelligent diaphragm type gas meter is reduced.

Claims (3)

1. A method for judging tiny leakage of an intelligent diaphragm gas meter is characterized by comprising the following steps: installing a differential pressure sensor in the intelligent membrane type gas meter, wherein two gas pressure acquisition ports of the differential pressure sensor are respectively installed on the inner side and the outer side of a gas outlet guide pipe of the intelligent membrane type gas meter, and establishing a function model of an average differential pressure value and flow in a rotary volume by using a gas flow standard device; when the intelligent diaphragm gas meter is used, when the gas flow in the metering pulse falls in a judgment area of micro leakage of the intelligent diaphragm gas meter, the gas using behavior of a user in the pulse time is identified according to the change of the pressure difference value, the gas using time period is determined, the gas flow of the user in the gas using time period is obtained according to the functional relation between the average pressure difference value and the flow in the gas using time period, so that the gas using amount of the user in each gas using time period in the pulse time is obtained, the flow in a non-user gas using time period is accurately calculated, whether the micro leakage exists or not is judged according to the flow in the non-user gas using time period, and therefore false alarm of micro leakage caused by intermittent gas using behavior of residents is reduced.
2. The method for determining a minute leakage in an intelligent diaphragm gas meter according to claim 1, wherein: the judgment of the tiny leakage comprises the following steps:
(1) establishing a function model of the average differential pressure value and the flow in the revolution volume by using a gas flow standard device, and (2) judging whether micro leakage exists.
3. The method for judging the tiny leakage of the intelligent diaphragm gas meter according to the claim 2, characterized in that the step (1) uses a gas flow standard device to establish a function model of the average differential pressure value and the flow in the revolution volume as follows:
installing a differential pressure sensor in the intelligent membrane type gas meter, and detecting the pressure difference value between the inner side of a gas outlet guide pipe and the outer side of the gas outlet guide pipe of the intelligent membrane type gas meter through the differential pressure sensor; the gas flow standard device is utilized, different flows are sequentially introduced, average differential pressure value data in the rotation volume under different flows are obtained, and a function model is used for carrying out data fitting on the average differential pressure value data and the flows:
Figure DEST_PATH_IMAGE002
wherein
Figure DEST_PATH_IMAGE004
Which represents the average pressure difference value, is,
Figure DEST_PATH_IMAGE006
the flow rate is represented by the flow rate,
Figure DEST_PATH_IMAGE008
is a function model of the mean differential pressure value and flow fitting;
the step (2) of judging whether the micro leakage exists is as follows:
step 1: sampling period for setting pressure sensor by microcontroller of intelligent diaphragm gas meter
Figure DEST_PATH_IMAGE010
Electromechanical conversion signal pulse equivalent
Figure DEST_PATH_IMAGE012
；
step 2: the microcontroller of the intelligent diaphragm gas meter acquires
Figure DEST_PATH_IMAGE014
Pulse signal, pulse time
Figure DEST_PATH_IMAGE016
，
Figure DEST_PATH_IMAGE018
Is the first
Figure DEST_PATH_IMAGE019
The end time of the pulse signal,
Figure DEST_PATH_IMAGE021
Is the first
Figure DEST_PATH_IMAGE022
At the start of the pulse signal the time of the start of the pulse signal,differential pressure sensor according to sampling period
Figure DEST_PATH_IMAGE023
Obtaining the pressure difference value of the gas outlet of the intelligent membrane type gas meter and calculating the gas flow
Figure DEST_PATH_IMAGE025
，
Figure DEST_PATH_IMAGE027
When gas flow rate
Figure DEST_PATH_IMAGE029
，
Figure DEST_PATH_IMAGE031
Is to judge the lower limit value of the micro-leakage gas flow,
Figure DEST_PATH_IMAGE033
if yes, executing step 3; when the gas flow rate
Figure DEST_PATH_IMAGE035
When, there is no micro-leakage;
step 3: first, the
Figure DEST_PATH_IMAGE036
A start time of the pulse signal
Figure 70980DEST_PATH_IMAGE021
Has previously collected
Figure DEST_PATH_IMAGE038
Differential pressure value, pulse time
Figure DEST_PATH_IMAGE040
Therein is provided with
Figure DEST_PATH_IMAGE042
A differential pressure value, then
Figure DEST_PATH_IMAGE044
、
Figure DEST_PATH_IMAGE046
、…、
Figure DEST_PATH_IMAGE048
，
Figure DEST_PATH_IMAGE049
Is the first
Figure DEST_PATH_IMAGE051
The difference value of the pressure difference is calculated,
Figure DEST_PATH_IMAGE052
is the first
Figure DEST_PATH_IMAGE054
A differential pressure value of …,
Figure DEST_PATH_IMAGE055
Is the first
Figure DEST_PATH_IMAGE057
And (3) calculating the ratio of the pressure difference values at adjacent sampling moments: if the current sampling time pressure difference value
Figure DEST_PATH_IMAGE059
，
Figure DEST_PATH_IMAGE061
Indicating the minimum differential pressure value to which the deviation term should be added
Figure DEST_PATH_IMAGE063
Calculating the ratio of the pressure difference values at adjacent sampling moments, and recording the ratio as
Figure DEST_PATH_IMAGE065
（
Figure DEST_PATH_IMAGE067
）、
Figure DEST_PATH_IMAGE069
（
Figure DEST_PATH_IMAGE071
）、
Figure DEST_PATH_IMAGE073
（
Figure DEST_PATH_IMAGE075
）、…、
Figure DEST_PATH_IMAGE077
（
Figure DEST_PATH_IMAGE079
) (ii) a If the current sampling time pressure difference value
Figure DEST_PATH_IMAGE081
The ratio of the differential pressure values at adjacent sampling moments is recorded as
Figure DEST_PATH_IMAGE083
、
Figure DEST_PATH_IMAGE085
、
Figure DEST_PATH_IMAGE087
、…、
Figure DEST_PATH_IMAGE089
(ii) a When the user just starts to use the gas, the differential pressure value fluctuates at the moment, the trend of increase is shown, and the user stops using the gasWhen the gas is inflated, the differential pressure value is reduced; if pulse time
Figure DEST_PATH_IMAGE090
The ratio of each differential pressure value satisfies
Figure DEST_PATH_IMAGE092
、
Figure DEST_PATH_IMAGE094
、
Figure DEST_PATH_IMAGE096
、…、
Figure DEST_PATH_IMAGE098
，
Figure DEST_PATH_IMAGE100
Is the minimum threshold value of the differential pressure value ratio,
Figure DEST_PATH_IMAGE102
Is the maximum threshold value of the differential pressure value ratio, and illustrates the pulse time
Figure DEST_PATH_IMAGE040A
The inner user has no gas using behavior and has a tiny leakage condition; if pulse time
Figure DEST_PATH_IMAGE103
The ratio of the internal differential pressure value to the differential pressure value is
Figure DEST_PATH_IMAGE105
The condition or the ratio of the differential pressure values of
Figure DEST_PATH_IMAGE107
To illustrate the user's active behavior during this time, step4 is executed;
step 4: determining the time period for using the gas by the user according to the ratio of the pressure difference value when the pressure difference value existsRatio of differential pressure values
Figure DEST_PATH_IMAGE108
In the case of (3), the time of obtaining a large differential pressure value is taken as the starting point of the gas consumption of the user, and if the differential pressure value ratios after the starting point of the gas consumption are all equal
Figure DEST_PATH_IMAGE110
If the end time of the pulse signal is used as the end point of the gas consumption, the ratio of the pressure difference value after the start point of the gas consumption is determined
Figure DEST_PATH_IMAGE111
Taking the acquisition time of the smaller differential pressure value as the gas utilization end point; when only the ratio of the differential pressure values
Figure DEST_PATH_IMAGE112
The time when the small pressure difference value is obtained is used as the gas use end point, and the pressure difference value ratios before the gas use end point are all larger than the minimum threshold value of the pressure difference value ratio
Figure DEST_PATH_IMAGE113
And is less than the maximum threshold of the differential pressure value ratio
Figure DEST_PATH_IMAGE114
During the time period, the user always uses the gas, which occurs at the starting time of the pulse signal, so that the starting time of the pulse signal is used as the starting point of the gas usage; calculating the gas consumption in each gas consumption time period of the user, and describing the gas consumption in a single gas consumption time period, wherein the pressure difference value in the gas consumption time period is
Figure DEST_PATH_IMAGE116
、
Figure DEST_PATH_IMAGE118
、…、
Figure DEST_PATH_IMAGE120
，
Figure DEST_PATH_IMAGE121
Is the first
Figure DEST_PATH_IMAGE123
A differential pressure value, also denoted as the 1 st differential pressure value in the gas usage period,
Figure DEST_PATH_IMAGE124
is the first
Figure DEST_PATH_IMAGE126
The differential pressure value, also denoted as the 2 nd differential pressure value in the gas usage period,
Figure DEST_PATH_IMAGE127
is the first
Figure DEST_PATH_IMAGE129
A differential pressure value, also representing the last differential pressure value in the gas usage time period; there are specifically three cases: the first case being the ratio of the differential pressure values
Figure DEST_PATH_IMAGE130
The gas using behavior is continuous gas using, and the pressure difference value ratios after the starting point of gas using are all
Figure DEST_PATH_IMAGE131
Up to the first
Figure DEST_PATH_IMAGE132
The end time of the pulse signal
Figure DEST_PATH_IMAGE133
The gas using time of the gas using time period
Figure DEST_PATH_IMAGE135
(ii) a Second case, ratio of pressure difference values
Figure DEST_PATH_IMAGE136
And the ratio of the pressure difference value after the start point of gas use exists
Figure DEST_PATH_IMAGE137
Condition of (2), i.e. differential pressure value
Figure DEST_PATH_IMAGE139
The time of acquisition is the end point of the gas consumption of the user, the differential pressure value
Figure DEST_PATH_IMAGE140
The acquisition time is the starting point of the gas consumption of the user, and the gas consumption time of the gas consumption time period
Figure DEST_PATH_IMAGE142
(ii) a The third case is when the ratio of only the magnitude of the pressure difference has
Figure DEST_PATH_IMAGE143
Condition (d), differential pressure value
Figure DEST_PATH_IMAGE144
The obtaining time is the end point of the gas usage of the user, and the pressure difference value ratios before the end point of the gas usage are all larger than the minimum threshold value of the pressure difference value ratios
Figure DEST_PATH_IMAGE145
And is less than the maximum threshold of the differential pressure value ratio
Figure DEST_PATH_IMAGE146
To a first order
Figure DEST_PATH_IMAGE147
Start time of pulse signal
Figure 907829DEST_PATH_IMAGE021
As the starting point of gas utilization, the gas utilization time of the gas utilization time period
Figure DEST_PATH_IMAGE149
(ii) a Average pressure difference value in the gas using period
Figure DEST_PATH_IMAGE151
And obtaining the gas flow rate in the gas using time period according to the function relation between the average pressure difference value and the flow rate
Figure DEST_PATH_IMAGE153
The gas consumption of the gas consumption time period
Figure DEST_PATH_IMAGE155
(ii) a When present, is
Figure DEST_PATH_IMAGE157
During the period of using gas, the gas using time is
Figure DEST_PATH_IMAGE159
The average pressure difference value of the gas using time period of (2) is
Figure DEST_PATH_IMAGE161
The gas flow rate is
Figure DEST_PATH_IMAGE163
Gas consumption in gas consumption time period
Figure DEST_PATH_IMAGE165
…, the gas consumption time is
Figure DEST_PATH_IMAGE167
Time period of gas use of, average pressure difference value of
Figure DEST_PATH_IMAGE169
With a gas flow of
Figure DEST_PATH_IMAGE171
Gas consumption in gas consumption time period
Figure DEST_PATH_IMAGE173
At this time, the flow rate in the period of non-gas use
Figure DEST_PATH_IMAGE175
Flow rate during periods when the user is not using gas
Figure DEST_PATH_IMAGE177
Satisfy the requirement of
Figure DEST_PATH_IMAGE179
Indicating the presence of a small leak; flow rate in non-gas-using time period of user
Figure DEST_PATH_IMAGE180
Satisfy the requirement of
Figure DEST_PATH_IMAGE182
No micro-leakage is indicated.
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