CN111323100B - Ultrasonic gas meter fault diagnosis system and method - Google Patents
Ultrasonic gas meter fault diagnosis system and method Download PDFInfo
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Abstract
The invention discloses a fault diagnosis system and method for an ultrasonic gas meter, wherein the system comprises a sampling moduleThe control module and the communication module; the sampling module is used for collecting ultrasonic signals received by the gas meter, and when the gas meter is installed, the sampling module collects the maximum initial sampling amplitude C0,maxInitial sampling amplitude C0,maxWithin a certain range, A0≤C0,max≤B0The sampling module is used for sampling the initial sampling amplitude C0,maxThe range value of the sampling module is sent to the control module, and the sampling module collects the real-time sampling amplitude C of the gas meter in real time in the using process of the gas meterm,max(ii) a And sending to the control module; the control module is used for receiving the initial sampling amplitude value C sent by the sampling module0,maxRange value of (C) and real-time sampled amplitude value C of real-time acquisitionm,maxWill sample the amplitude C in real timem,maxAnd the initial sampling amplitude C0,maxIf the comparison result is: cm,max<A0And the control module sends the comparison result to the remote terminal through the communication module to give an alarm. The invention realizes the metering parameter diagnosis of the gas meter.
Description
Technical Field
The invention relates to the technical field of natural gas supply equipment, in particular to a fault diagnosis system and method for an ultrasonic gas meter.
Background
The key components and technologies of the ultrasonic gas meter comprise an ultrasonic transducer, a flow channel, a metering chip and the like, meanwhile, the components of a natural gas medium are relatively complex, and the natural gas medium mainly comprises twenty components such as methane, and sometimes comprises substances such as water, oil gas, small-particle solid impurities and the like. The ultrasonic transducer is a device made of a piezoelectric ceramic wafer, and the external surface of the ultrasonic transducer further comprises a shell, a lead wire, a rear noise cutting layer and a front acoustic matching layer, and adhesive bonding layers among the components, wherein in the severe environment of gas, pollutants are likely to be bonded on the acoustic matching layer during the service life (generally 6-9 years) of the ultrasonic gas meter, and the performance of the components and the adhesive bonding layers is deteriorated, aged or damaged, in which case, the metering precision of the gas meter is deteriorated, and even the metering cannot be carried out.
Therefore, the gas meter needs to have a self-diagnosis function, when the gas meter cannot work normally, fault information needs to be given, the fault information is transmitted to a management background of a gas company through communication channels such as the internet of things, and then the background gives an alarm to remind the gas company to check the fault gas meter and repair or replace the fault gas meter.
Disclosure of Invention
The invention aims to provide a fault diagnosis system and method for an ultrasonic gas meter, which are used for realizing the diagnosis of the metering parameters of the gas meter.
The invention is realized by the following technical scheme:
an ultrasonic gas meter fault diagnosis system comprises a sampling module, a control module and a communication module;
the sampling module is used for collecting ultrasonic signals received by the gas meter, and when the gas meter is installed, the sampling module collects the ultrasonic signals according to an initial sampling waveform and a sampling sequence value C0(n) obtaining the maximum initial sampling amplitude C according to a search comparison algorithm0,maxInitial sampling amplitude C0,maxWithin a certain range, A0≤C0,max≤B0The sampling module is used for sampling the initial sampling amplitude C0,maxThe range value of the sampling module is sent to the control module and stored in the control module, the sampling module collects ultrasonic signals received by the gas meter in real time in the using process of the gas meter, and the sampling module obtains the maximum real-time sampling amplitude value C according to the real-time sampling waveform and the sampling sequence value Cm (n) and a searching comparison algorithmm,maxThe real-time sampling amplitude Cm,maxWithin a certain range, Am≤Cm,max≤Bm(ii) a The sampling module samples the real-time sampled amplitude C acquired in real timem,maxSending the data to a control module;
the control module is used for receiving an initial sampling amplitude value C sent by the sampling module0,maxRange value of (C) and real-time sampled amplitude value C of real-time acquisitionm,maxWill sample the amplitude C in real timem,maxAnd the initial sampling amplitude C0,maxIf the comparison result is: cm,max<A0And the control module sends the comparison result to the remote terminal through the communication module to give an alarm.
The applicant found through experiments that:
when the gas meter is installed, the reflecting surface of the ultrasonic wave is a smooth reflecting plane, and only plane reflection existsPenetrate, in the continuous use of gas, because the accumulation of pollutants such as dust for the reflection plane of ultrasonic wave no longer is a smooth reflection plane, and the ultrasonic wave can form diffuse reflection, and no longer plane reflection, and the reflection acquisition signal of ultrasonic wave will change when installing this moment, and the main parameter index of this change is sampling amplitude, consequently, through comparing real-time sampling amplitude Cm,maxAnd the initial sampling amplitude C0,maxThe range value of the method can judge the metering precision of the gas meter and can work normally enough, and the metering parameter diagnosis of the gas meter is realized.
Therefore, the invention samples the amplitude value in real time by comparing the real-time sampling amplitude value according to the change of the reflecting surface of the ultrasonic wave when the gas meter is installed and in the continuous use processCm,maxAnd the initial sampling amplitude C0,maxThe range value of the method can judge the metering precision of the gas meter and can work normally enough, and the metering parameter diagnosis of the gas meter is realized.
Further, the device also comprises a timing module;
the timing module is used for acquiring the initial downstream propagation time t of the ultrasonic wave in the fluid0,downInitial countercurrent propagation time t of ultrasonic waves in a fluid0,upReal-time downstream propagation time t of ultrasonic waves in a fluidm,downAnd the real-time countercurrent propagation time t of ultrasonic waves in the fluidm,upThe timing module will initiate a downstream propagation time t0,downAnd initial countercurrent propagation time t0,upSending the real-time downstream propagation time t to a control module and storing the real-time downstream propagation time t in the control module, wherein the real-time downstream propagation time t is acquired by a timing module in real timem,downAnd the real-time countercurrent propagation time t of ultrasonic waves in the fluidm,upSending the data to a control module;
the control module is used for receiving and comparing the initial downstream propagation time t sent by the module during counting0,downAnd initial countercurrent propagation time t0,upReal-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upWhen the flow velocity v of the gasmWhen t is equal to 0m,down＝tm,upAnd t0,down＝t0,upWhen the difference value between the two reaches the lower limit value of the time threshold value, the control is carried outThe system module sends the comparison result to the remote terminal through the communication module to give an alarm; and a time threshold value with the real-time propagation time smaller than the initial propagation time is stored in the control module.
With further use of the gas meter, the more the dust is accumulated, the dust can form a certain thickness on the reflecting surface at the moment, and the propagation acoustic path of the ultrasonic wave is L at the momentmAnd is no longer L0And L ism<L0When the user is not using gas, the flow velocity v of the gas m0, such as late at night, etc., when the sound velocity c in the gas is constant if the composition of the gas is not changedm,f＝c0,f；
According to
From, Lm<L0
Then, tm,down＝tm,up<t0,down＝t0,up；
When t ism,down＝tm,upLess than t0,down＝t0,upAt a certain range (which can be determined by experiment), an alarm can be given.
According to the method, a certain thickness is formed on the reflecting surface by dust in the continuous use process of the gas meter, so that the propagation sound path of ultrasonic waves is smaller than that of the ultrasonic waves in the installation process, the propagation sound path can be fed back through the downstream propagation time of the ultrasonic waves in the fluid or the upstream propagation time of the ultrasonic waves in the fluid, and the metering accuracy of the gas meter can be diagnosed by comparing the real-time downstream propagation time or the real-time upstream propagation time with the initial downstream propagation time or the initial upstream propagation time.
Further, the device also comprises a pressure sensor and a temperature sensor;
the pressure sensor and the temperature sensor are respectively used for acquiring a pressure signal and a temperature signal of the natural gas in real time and sending the pressure signal and the temperature signal to the control module;
the control module is used for receiving a pressure signal and a temperature signalCalculating theoretical sound velocity c in natural gas by combining component information of gas stored insidem,fThe control module is used for controlling the natural gas pipeline to work according to the initial sound channel length L of the natural gas pipeline stored inside0And real-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upObtaining an actual calculated speed of sound c'm，f(ii) a When the theoretical speed of sound cm,fAnd actual calculated sound velocity c'm，fAnd when the difference value between the two reaches the lower limit value of the sound velocity threshold value, the control module sends the comparison result to the remote terminal through the communication module to alarm.
According to the invention, the correct sound velocity of the natural gas can be calculated by collecting the temperature and pressure signals and combining the component information of the fuel gas, and the diagnosis of the fuel gas meter can be realized under the condition that a user uses the fuel gas by comparing the correct sound velocity of the natural gas with the actually calculated sound velocity, so that the application range of the diagnosis is improved.
Furthermore, the control module is internally provided with range values of real-time downstream propagation time tm, down and real-time upstream propagation time tm, up when the acquired real-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upIf the transmission time is not within the range value, the control module judges that the correct transmission time cannot be calculated, and sends the transmission time to the remote terminal through the communication module to alarm.
Furthermore, the control module is internally provided with a range value of the real-time sampling waveform and the sampling sequence value Cm (n), when the acquired real-time sampling waveform and the sampling sequence value Cm (n) are not in the range, the control module judges that the gas meter cannot acquire the sound wave signal with good signal-to-noise ratio, and then the control module sends the sound wave signal to the remote terminal through the communication module for warning.
An ultrasonic gas meter fault diagnosis method includes the steps that an initial sampling amplitude value C is collected through a sampling module0,maxAnd real-time sampling amplitude Cm,maxComparing in the control module the real-time sampled amplitude Cm,maxAnd the initial sampling amplitude C0,maxAre compared with the range values of A0≤C0,max≤B0And if the comparison result is that: cm,max<A0The control module sends the comparison result through the communication moduleAnd sending the information to a remote terminal for warning.
An ultrasonic gas meter fault diagnosis method includes the steps that a timing module is used for collecting initial downstream propagation time t of ultrasonic waves in fluid0,downInitial countercurrent propagation time t of ultrasonic waves in a fluid0,upReal-time downstream propagation time t of ultrasonic waves in a fluidm,downAnd the real-time countercurrent propagation time t of ultrasonic waves in the fluidm,upWhen the flow velocity v of the gasmWhen 0, comparing the initial propagation time and the real-time propagation time in the control module, when tm,down＝tm,upAnd t0,down＝t0,upWhen the difference value between the two values reaches the lower limit value of the time threshold value, the control module sends the comparison result to the remote terminal through the communication module to give an alarm.
A method for diagnosing faults of an ultrasonic gas meter comprises the steps of respectively collecting pressure signals and temperature signals of natural gas in real time through a pressure sensor and a temperature sensor, sending the pressure signals and the temperature signals to a control module, and calculating theoretical sound velocity c in the natural gas according to the pressure signals and the temperature signals and by combining component information of gas stored inside the control modulem,fBased on the initial acoustic path length L of the internally stored natural gas pipeline0And real-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upObtaining an actual calculated speed of sound c'm，f(ii) a When the theoretical speed of sound cm,fAnd actual calculated sound velocity c'm，fAnd when the difference value between the two reaches the lower limit value of the sound velocity threshold value, the control module sends the comparison result to the remote terminal through the communication module to alarm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention samples the amplitude C in real time by comparing the change of the reflecting surface of the ultrasonic wave when the gas meter is installed and in the continuous use processm,maxAnd the initial sampling amplitude C0,maxThe range value of the method can judge the metering precision of the gas meter and can work normally enough, and the metering parameter diagnosis of the gas meter is realized.
2. According to the method, a certain thickness is formed on the reflecting surface by dust in the continuous use process of the gas meter, so that the propagation sound path of ultrasonic waves is smaller than that of the ultrasonic waves in the installation process, the propagation sound path can be fed back through the downstream propagation time of the ultrasonic waves in the fluid or the upstream propagation time of the ultrasonic waves in the fluid, and the metering accuracy of the gas meter can be diagnosed by comparing the real-time downstream propagation time or the real-time upstream propagation time with the initial downstream propagation time or the initial upstream propagation time.
3. According to the invention, the correct sound velocity of the natural gas can be calculated by collecting the temperature and pressure signals and combining the component information of the fuel gas, and the diagnosis of the fuel gas meter can be realized under the condition that a user uses the fuel gas by comparing the correct sound velocity of the natural gas with the actually calculated sound velocity, so that the application range of the diagnosis is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a first schematic diagram of the working principle of a time difference method gas meter;
FIG. 2 is a schematic diagram of a second working principle of a time difference method gas meter;
FIG. 3 is a schematic diagram of a gas meter installed by an A/D sampling method;
FIG. 4 is a schematic sampling diagram of the gas meter using the A/D sampling method;
FIG. 5 is a functional block diagram of a correct sound velocity measurement of natural gas.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1:
an ultrasonic gas meter fault diagnosis system comprises a sampling module, a control module and a communication module;
the sampling moduleThe ultrasonic wave signal that is used for gathering the gas table and receives, when the gas table is installed, sampling module is according to initial sampling waveform and sampling sequence value C0(n) obtaining the maximum initial sampling amplitude C according to a search comparison algorithm0,maxInitial sampling amplitude C0,maxWithin a certain range, A0≤C0,max≤B0The sampling module is used for sampling the initial sampling amplitude C0,maxThe range value of the sampling module is sent to the control module and stored in the control module, the sampling module collects ultrasonic signals received by the gas meter in real time in the using process of the gas meter, and the sampling module obtains the maximum real-time sampling amplitude value C according to the real-time sampling waveform and the sampling sequence value Cm (n) and a searching comparison algorithmm,maxThe real-time sampling amplitude Cm,maxWithin a certain range, Am≤Cm,max≤Bm(ii) a The sampling module samples the real-time sampled amplitude C acquired in real timem,maxSending the data to a control module;
the control module is used for receiving an initial sampling amplitude value C sent by the sampling module0,maxRange value of (C) and real-time sampled amplitude value C of real-time acquisitionm,maxWill sample the amplitude C in real timem,maxAnd the initial sampling amplitude C0,maxIf the comparison result is: cm,max<A0And the control module sends the comparison result to the remote terminal for warning through the communication module, wherein the control module can be a chip.
The diagnostic method of the present embodiment: collecting initial sampling amplitude C by a sampling module0,maxAnd real-time sampling amplitude Cm,maxComparing in the control module the real-time sampled amplitude Cm,maxAnd the initial sampling amplitude C0,maxAre compared with the range values of A0≤C0,max≤B0And if the comparison result is that: cm,max<A0And the control module sends the comparison result to the remote terminal through the communication module to give an alarm.
In this embodiment, as shown in FIG. 3, when the gas meter is installed, C is 650 ≦ C0,maxLess than or equal to 700 percent, and due to pollutants such as dust and the like in the continuous use process of the fuel gasStacking to make the reflection surface of the ultrasonic wave not a smooth reflection plane any more, the ultrasonic wave forms diffuse reflection instead of plane reflection, and the reflection acquisition signal of the ultrasonic wave is shown in figure 4, C is more than or equal to 400m,max550 or less, therefore, Cm,max<A0And the control module sends the comparison result to the remote terminal through the communication module for warning.
Example 2:
the embodiment is based on embodiment 1, and further comprises a timing module; the timing module is used for acquiring the initial downstream propagation time t of the ultrasonic wave in the fluid0,downInitial countercurrent propagation time t of ultrasonic waves in a fluid0,upReal-time downstream propagation time t of ultrasonic waves in a fluidm,downAnd the real-time countercurrent propagation time t of ultrasonic waves in the fluidm,upThe timing module will initiate a downstream propagation time t0,downAnd initial countercurrent propagation time t0,upSending the real-time downstream propagation time t to a control module and storing the real-time downstream propagation time t in the control module, wherein the real-time downstream propagation time t is acquired by a timing module in real timem,downAnd the real-time countercurrent propagation time t of ultrasonic waves in the fluidm,upSending the data to a control module;
the control module is used for receiving and comparing the initial downstream propagation time t sent by the module during counting0,downAnd initial countercurrent propagation time t0,upReal-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upWhen the flow velocity v of the gasmWhen t is equal to 0m,down＝tm,upAnd t0,down＝t0,upWhen the difference value reaches the lower limit value of the time threshold value, the control module sends the comparison result to the remote terminal through the communication module to alarm; and a time threshold value with the real-time propagation time smaller than the initial propagation time is stored in the control module.
The diagnostic method of the present embodiment: acquiring initial downstream propagation time t of ultrasonic waves in fluid through timing module0,downInitial countercurrent propagation time t of ultrasonic waves in a fluid0,upReal-time downstream propagation time t of ultrasonic waves in a fluidm,downAnd real-time counter-flow of ultrasonic waves in the fluidPropagation time tm,upWhen the flow velocity v of the gasmWhen 0, comparing the initial propagation time and the real-time propagation time in the control module, when tm,down＝tm,upAnd t0,down＝t0,upWhen the difference value between the two values reaches the lower limit value of the time threshold value, the control module sends the comparison result to the remote terminal through the communication module to give an alarm.
The gas meter is a speed meter which causes ultrasonic downstream and upstream propagation time difference by the action of gas flow in a closed pipeline on ultrasonic beams, the actual propagation speed of ultrasonic waves in the gas is composed of components of the propagation speed of the ultrasonic waves and the axial flow speed of fluid in the ultrasonic propagation direction under the static state of the gas, the propagation speed of the ultrasonic waves in the downstream direction is high, the propagation speed in the upstream direction is low, the propagation time in the downstream direction and the propagation time in the upstream direction are measured, and the time difference is calculated. And calculating the gas flow rate by utilizing the relation between the time difference of the ultrasonic downstream and upstream propagation and the propagation distance, and obtaining the gas flow through the cross section area of the gas meter sound channel. The basic principle of the time difference method ultrasonic gas meter is shown in fig. 1 and fig. 2.
The relationship between the ultrasonic wave forward flow and reverse flow propagation time and each quantity of the gas meter is as follows:
in the formula:
tdown-downstream propagation time of the ultrasonic wave in the fluid, s;
tup-the counter-current propagation time of the ultrasonic waves in the fluid, s;
l-channel length, m;
cf-the speed of propagation of the acoustic wave in the fluid, m/s;
vm-the axial average velocity of the gas, m/s;
phi-channel angle, deg..
The velocity of the fluid can be deduced from the two equations of equation (1):
average velocity v of gas in closed conduitmIn relation to the cross-sectional area S of the sound channel, the instantaneous flow rate is obtained.
q＝vm×S (3)
In the formula:
s-cross-sectional area of sound channel, m2；
q-instantaneous flow rate, m3/h。
According to the formula (1), when the gas meter is not using gas by a user, such as late at night, the flow rate v of the gas ism＝0，
Then
Then
L is a fixed value,
therefore, we measure the time of flight t at zero flowdown,tupThe speed of sound c in the natural gas can be determinedf,。
If the velocity of sound c in the gas is contaminated by transducer foulingfThe constant L is smaller than the normal measurement time, the actual measured flight time is smaller, and the sound velocity c obtained by calculation according to the formula (5) is normalfIt becomes large.
With further use of the gas meter, the more the dust is accumulated, the dust can form a certain thickness on the reflecting surface at the moment, and the propagation acoustic path of the ultrasonic wave is L at the momentmAnd is no longer L0And L ism<L0When the user is not using gas, the flow velocity v of the gas m0, such as late at night, etc., when the sound velocity c in the gas is constant if the composition of the gas is not changedm,f＝c0,f
From, Lm<L0
Then, tm,down＝tm,up<t0,down＝t0,up
When t ism,down＝tm,upLess than t0,down＝t0,upAt a certain range (which can be determined by experiment), an alarm can be given.
With further use of the gas meter, the more the dust is accumulated, the dust can form a certain thickness on the reflecting surface at the moment, and the propagation acoustic path of the ultrasonic wave is L at the momentmAnd is no longer L0And L ism<L0When the user is not using gas, the flow velocity v of the gas m0, such as late at night, etc., when the sound velocity c in the gas is constant if the composition of the gas is not changedm,f＝c0,f
From, Lm<L0
Then, tm,down＝tm,up<t0,down＝t0,up
When t ism,down＝tm,upLess than t0,down＝t0,upAt a certain range (which can be determined by experiment), an alarm can be given.
Example 3:
the embodiment is based on embodiment 2, and further comprises a pressure sensor and a temperature sensor;
the pressure sensor and the temperature sensor are respectively used for acquiring a pressure signal and a temperature signal of the natural gas in real time and sending the pressure signal and the temperature signal to the control module;
the control module is used for receiving pressure signals and temperature signals and combining the group of gas stored insideThe theoretical sound velocity c in the natural gas is calculated according to informationm,fThe control module is used for controlling the natural gas pipeline to work according to the initial sound channel length L of the natural gas pipeline stored inside0And real-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upObtaining an actual calculated speed of sound c'm，f(ii) a When the theoretical speed of sound cm,fAnd actual calculated sound velocity c'm，fAnd when the difference value between the two reaches the lower limit value of the sound velocity threshold value, the control module sends the comparison result to the remote terminal through the communication module to alarm.
The diagnostic method of the present embodiment: respectively acquiring a pressure signal and a temperature signal of the natural gas in real time through a pressure sensor and a temperature sensor, sending the pressure signal and the temperature signal to a control module, and calculating a theoretical sound velocity c in the natural gas according to the pressure signal and the temperature signal and by combining component information of the gas stored inside in the control modulem,fBased on the initial acoustic path length L of the internally stored natural gas pipeline0And real-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upObtaining an actual calculated speed of sound c'm，f(ii) a When the theoretical speed of sound cm,fAnd actual calculated sound velocity c'm，fAnd when the difference value between the two reaches the lower limit value of the sound velocity threshold value, the control module sends the comparison result to the remote terminal through the communication module to alarm.
The implementation is to calculate the sound velocity for judgment
From the theoretical sound velocity (actual sound velocity):
from, Lm<L0
When the actual calculated speed of sound is:
and theoretical speed of sound cm,fThe following method is used for calculation:
for the correct sound velocity of the natural gas, the correct sound velocity can be obtained by other means, such as calculation according to the flow of fig. 5 (the calculation method is the prior art), the pressure and the temperature of the gas are obtained according to the pressure and the temperature sensors installed on the gas meter, and the component information of the gas is input by a gas company through a network.
When c'm，f＞cm,fAn alarm may be generated at a certain range (which may be determined experimentally and stored in the control module).
According to the natural gas meter diagnosis method and the natural gas meter diagnosis system, the correct sound velocity of the natural gas can be calculated by collecting the temperature and pressure signals and combining the component information of the fuel gas, the correct sound velocity of the natural gas is compared with the actual sound velocity, diagnosis of the fuel gas meter can be achieved under the condition that a user uses the fuel gas, and the application range of diagnosis is widened.
Example 4:
this embodiment is based on any one of embodiment 1 to embodiment 3, and the control module is configured to set a real-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upWhen the real-time downstream propagation time t of the acquisitionm,downAnd real-time upstream propagation time tm,upIf the transmission time is not within the range value, the control module judges that the correct transmission time cannot be calculated, and sends an alarm to the remote terminal through the communication module; the control module is internally provided with a range value of a real-time sampling waveform and a sampling sequence value Cm (n), when the acquired real-time sampling waveform and the sampling sequence value Cm (n) are not in the range, the control module judges that the gas meter can not acquire a sound wave signal with a good signal-to-noise ratio, and sends the sound wave signal to the remote terminal for warning through the communication module.
In this embodiment, when the ultrasonic transducer is damaged, the sound wave signal with good signal-to-noise ratio is not collected (the range can be determined by experiment), or the correct flight time t cannot be estimatedm,down,tn,up,(this range value may be determined experimentally) an alarm is raised.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An ultrasonic gas meter fault diagnosis system is characterized by comprising a sampling module, a control module and a communication module;
the sampling module is used for collecting ultrasonic signals received by the gas meter, and when the gas meter is installed, the sampling module collects the ultrasonic signals according to an initial sampling waveform and a sampling sequence value C0(n) obtaining the maximum initial sampling amplitude C according to a search comparison algorithm0,maxInitial sampling amplitude C0,maxWithin a certain range, A0≤C0,max≤B0The sampling module is used for sampling the initial sampling amplitude C0,maxThe range value of the sampling module is sent to the control module and stored in the control module, the sampling module collects ultrasonic signals received by the gas meter in real time in the using process of the gas meter, and the sampling module obtains the maximum real-time sampling amplitude value C according to the real-time sampling waveform and the sampling sequence value Cm (n) and a searching comparison algorithmm,maxThe real-time sampling amplitude Cm,maxWithin a certain range, Am≤Cm,max≤Bm(ii) a The sampling module samples the real-time sampled amplitude C acquired in real timem,maxSending the data to a control module;
the control module is used for receiving an initial sampling amplitude value C sent by the sampling module0,maxRange value of (C) and real-time sampled amplitude value C of real-time acquisitionm,maxWill sample the amplitude C in real timem,maxAnd the initial sampling amplitude C0,maxIf the comparison result is: cm,max<A0And the control module sends the comparison result to the remote terminal through the communication module to give an alarm.
2. The ultrasonic gas meter fault diagnosis system according to claim 1, further comprising a timing module;
the timing module is used for collecting ultrasonic waves in fluidInitial downstream propagation time t0,downInitial countercurrent propagation time t of ultrasonic waves in a fluid0,upReal-time downstream propagation time t of ultrasonic waves in a fluidm,downAnd the real-time countercurrent propagation time t of ultrasonic waves in the fluidm,upThe timing module will initiate a downstream propagation time t0,downAnd initial countercurrent propagation time t0,upSending the real-time downstream propagation time t to a control module and storing the real-time downstream propagation time t in the control module, wherein the real-time downstream propagation time t is acquired by a timing module in real timem,downAnd the real-time countercurrent propagation time t of ultrasonic waves in the fluidm,upSending the data to a control module;
the control module is used for receiving and comparing the initial downstream propagation time t sent by the module during counting0,downAnd initial countercurrent propagation time t0,upReal-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upWhen the flow velocity v of the gasmWhen t is equal to 0m,down＝tm,upAnd t0,down＝t0,upWhen the difference value reaches the lower limit value of the time threshold value, the control module sends the comparison result to the remote terminal through the communication module to alarm; and a time threshold value with the real-time propagation time smaller than the initial propagation time is stored in the control module.
3. The ultrasonic gas meter fault diagnosis system according to claim 2, further comprising a pressure sensor and a temperature sensor;
the pressure sensor and the temperature sensor are respectively used for acquiring a pressure signal and a temperature signal of the natural gas in real time and sending the pressure signal and the temperature signal to the control module;
the control module is used for receiving the pressure signal and the temperature signal and calculating a theoretical sound velocity c in the natural gas by combining the component information of the gas stored insidem,fThe control module is used for controlling the natural gas pipeline to work according to the initial sound channel length L of the natural gas pipeline stored inside0And real-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upObtaining an actual calculated speed of sound c'm，f(ii) a When the theoretical speed of sound cm,fAnd actual calculated sound velocity c'm，fAnd when the difference value between the two reaches the lower limit value of the sound velocity threshold value, the control module sends the comparison result to the remote terminal through the communication module to alarm.
4. The ultrasonic gas meter fault diagnosis system according to claim 2, wherein a real-time downstream propagation time t is provided in the control modulem,downAnd real-time upstream propagation time tm,upWhen the real-time downstream propagation time t of the acquisitionm,downAnd real-time upstream propagation time tm,upIf the transmission time is not within the range value, the control module judges that the correct transmission time cannot be calculated, and sends the transmission time to the remote terminal through the communication module to alarm.
5. The ultrasonic gas meter fault diagnosis system according to any one of claims 1 to 4, wherein a range value of a real-time sampling waveform and a sampling sequence value cm (n) is set in the control module, and when the acquired real-time sampling waveform and the sampling sequence value cm (n) are not in the range, it is determined that the gas meter cannot acquire a sound wave signal with a good signal-to-noise ratio, and the control module sends the sound wave signal to a remote terminal through the communication module to give an alarm.
6. The fault diagnosis method of the ultrasonic gas meter fault diagnosis system according to claim 1, characterized in that an initial sampling amplitude value C is acquired by a sampling module0,maxAnd real-time sampling amplitude Cm,maxComparing in the control module the real-time sampled amplitude Cm,maxAnd the initial sampling amplitude C0,maxAre compared with the range values of A0≤C0,max≤B0And if the comparison result is that: cm,max<A0And the control module sends the comparison result to the remote terminal through the communication module to give an alarm.
7. The fault diagnosis method of the ultrasonic gas meter fault diagnosis system according to claim 2, characterized in that the ultrasonic waves are collected by the timing moduleInitial forward flow propagation time t in a fluid0,downInitial countercurrent propagation time t of ultrasonic waves in a fluid0,upReal-time downstream propagation time t of ultrasonic waves in a fluidm,downAnd the real-time countercurrent propagation time t of ultrasonic waves in the fluidm,upWhen the flow velocity v of the gasmWhen 0, comparing the initial propagation time and the real-time propagation time in the control module, when tm,down＝tm,upAnd t0,down＝t0,upWhen the difference value between the two values reaches the lower limit value of the time threshold value, the control module sends the comparison result to the remote terminal through the communication module to give an alarm.
8. The fault diagnosis method of the ultrasonic gas meter fault diagnosis system according to claim 3, characterized in that the pressure sensor and the temperature sensor respectively collect the pressure signal and the temperature signal of the natural gas in real time and send the pressure signal and the temperature signal to the control module, and in the control module, the theoretical sound velocity c in the natural gas is calculated according to the pressure signal and the temperature signal and by combining the component information of the gas stored insidem,fBased on the initial acoustic path length L of the internally stored natural gas pipeline0And real-time downstream propagation time tm,downAnd real-time upstream propagation time tm,upObtaining an actual calculated speed of sound c'm，f(ii) a When the theoretical speed of sound cm,fAnd actual calculated sound velocity c'm，fAnd when the difference value between the two reaches the lower limit value of the sound velocity threshold value, the control module sends the comparison result to the remote terminal through the communication module to alarm.
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