CN102564681A - Method for determining flowing state of medium in pipeline for ultrasonic gas meter - Google Patents
Method for determining flowing state of medium in pipeline for ultrasonic gas meter Download PDFInfo
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- CN102564681A CN102564681A CN2012100371619A CN201210037161A CN102564681A CN 102564681 A CN102564681 A CN 102564681A CN 2012100371619 A CN2012100371619 A CN 2012100371619A CN 201210037161 A CN201210037161 A CN 201210037161A CN 102564681 A CN102564681 A CN 102564681A
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Abstract
The utility model discloses a method for determining the flowing state of a medium in a pipeline for an ultrasonic gas meter. Pressure sensors are installed at the positions of a measuring pipe section of the ultrasonic gas meter adjacent to an inlet and an outlet, and used for monitoring the pressure difference between the inlet and the outlet of the ultrasonic gas meter in real time, and according to the physical phenomenon that the pressure difference generated after the medium flows through a flow resistance element in the fluid mechanics is proportional to the square of flow rate of medium, whether the medium in the pipeline is in a flowing state or dead state is judged according to the measured pressure difference and the change conditions. The method is used for the ultrasonic gas meter, and can provide a quick switching command for the ultrasonic gas meter under both the standby mode and the measuring mode, thereby effectively prolonging the service life of the battery for the ultrasonic gas meter; in addition, the method can provide a selection basis of correction time for real-time zero correction of the ultrasonic gas meter.
Description
Technical field
The present invention relates to a kind of pipeline internal medium flow state decision method, particularly relate to a kind of pipeline internal medium flow state decision method that is used for ultrasonic wave gas meter.
Background technology
Ultrasonic wave gas meter has become the important development direction of gas metering field because of advantage such as its more traditional diaphragm gas meter has that measuring accuracy is higher, better reliability, the pressure loss are littler.At present, ultrasonic wave gas meter generally adopts the internal battery power supply, generally requires battery to reach more than the 5-6 serviceable life.If the ultrasonic wave gas meter running down of battery needs gas company or user in time more to renew battery, otherwise can't continue metering.Therefore, battery serviceable life always is the important performance indexes of ultrasonic wave gas meter product, and long battery can reduce complete machine operation and maintenance cost serviceable life.At present, the method that is used to prolong ultrasonic wave gas meter battery serviceable life mainly contains: the circuit design of more low-power consumption is adopted in (1), comprises the chip, the system of selecting low voltage power supply that select low-power consumption for use, selects suitable clock scheme etc.; (2) aspect measurement pattern, when ultrasonic wave gas meter does not carry out flow measurement, get into the low-power consumption park mode, to reduce the complete machine power consumption time; (3) in gas meter, flow meter, increase TRT, utilize the pressure differential TRT generating in the pipeline to use for gas meter, flow meter.
Yet for gas metering, have following characteristics for the family: the most of the time does not have flow and can survey, and leaves home the work hours like resident family; Combustion gas is used frequently in short time, during going home to cook like resident family.This just requires ultrasonic wave gas meter to have the function that the pipeline internal medium flow state is judged, thereby realizes: during no flow can be surveyed, be in park mode, to reduce Overall Power Consumption as far as possible; When combustion gas is used, be in mode of operation, with accurate metered flow.For this reason, traditional method is passed through ultrasonic wave gas flow measurement module periodic measurement velocity of medium, thereby regularly obtains the flow state of pipeline internal medium.This has not only increased the not ultrasonic wave gas meter Overall Power Consumption between the operating period (carrying out the velocity of medium judgement because of needs get into measurement pattern every now and then) of pipe gas greatly, and its response characteristic depends on the gap periods that regularly tests the speed fully.If at interval more of a specified duration, though power consumption reduces, respond slowlyer, can't when the pipe gas valve open, in time carry out flow metering.If shorter at interval, though response accelerates, because the frequent mode of operation that gets into, the gas meter, flow meter Overall Power Consumption increases naturally.Therefore, ultrasonic wave gas meter is badly in need of a kind of flow state of pipeline internal medium fast and accurately decision method at present, thereby realizes: when pipeline does not have media flow, make ultrasonic wave gas meter get into park mode as early as possible, to reduce Overall Power Consumption; When media flow is arranged, make ultrasonic wave gas meter get into mode of operation as early as possible, to guarantee metering accuracy.
In addition, existing ultrasonic wave gas meter product usually can be regularly to carrying out self-correcting zero point, thereby guarantee the long-time stability of measuring accuracy.When carrying out the zero point self-correcting, ultrasonic wave gas meter need guarantee that pipeline internal medium stays cool, and this also requires ultrasonic wave gas meter that a kind of flow state of pipeline internal medium accurately decision-making function is arranged.
Summary of the invention
The object of the present invention is to provide a kind of pipeline internal medium flow state decision method that is used for ultrasonic wave gas meter, utilize institute's measuring pressure difference and situation of change thereof to judge that pipeline internal medium is in the still dead state that flows.
In order to achieve the above object, the technical scheme of the present invention's employing is following:
In the porch of ultrasonic wave gas meter first pressure transducer is installed; Second pressure transducer is installed in the exit; Monitor the inlet of ultrasonic wave gas meter and the pressure differential between the outlet in real time through two pressure transducers, judge that according to institute's measuring pressure difference and situation of change thereof pipeline internal medium is in the still dead state that flows.
Described pressure differential and situation of change monitoring method thereof are based on the fluid mechanics medium and flow through the pressure differential of flow resistive element generation and square physical phenomenon that is directly proportional of velocity of medium; When the pressure differential in the inlet of ultrasonic wave gas meter and exit during, think that the pipeline medium is in flow state greater than preset value; When pressure differential numerical value during, think that the pipeline medium stays cool less than preset value.
When described ultrasonic wave gas meter is U font ultrasonic wave gas meter, directly utilize U font measuring channel, produce the pressure differential between inlet and the outlet as flow resistive element.
When described ultrasonic wave gas meter is through-type ultrasonic wave gas meter, between entrance and exit, is provided with in addition and shrinks pipeline section, be used to produce the pressure differential between the entrance and exit as flow resistive element.
The foundation that described pipeline internal medium flow state is judged is that the pressure difference signal between the entrance and exit is inserted the signal comparator anode; The preset value electric signal inserts the signal comparator negative terminal; When the magnitude of voltage of pressure difference signal is higher than the magnitude of voltage of preset value electric signal; Signal comparator output high level, when the magnitude of voltage of pressure difference signal is lower than the magnitude of voltage of preset value electric signal, the signal comparator output low level; The real-time sign that the rising edge that signal comparator output is changed to high level from low level begins to flow as pipeline internal medium; The real-time sign that signal comparator output is stopped to flow as pipeline internal medium to the negative edge of low transition from high level.
Signal comparator is exported signal insert the ultrasonic wave gas meter interrupt interface; When ultrasonic wave gas meter from the signal comparator output terminal receive the sign medium stop to flow the negative edge signal time; Stop flow metering through the negative edge interrupt service routine, get into standby mode or get into correction mode; When ultrasonic wave gas meter from the signal comparator output terminal receive the sign medium begin to flow the rising edge signal time, through the rising edge interrupt service routine gas meter, flow meter is switched to measurement pattern from standby mode, carry out flow metering.
The beneficial effect that the present invention has is:
1, realizes that for ultrasonic wave gas meter low-power consumption provides a kind of flow state of pipeline internal medium fast and accurately decision method; Thereby realize: when pipeline does not have media flow; Make ultrasonic wave gas meter get into park mode as early as possible, thereby Overall Power Consumption is minimized; When media flow is arranged, make ultrasonic wave gas meter get into mode of operation as early as possible, thereby the rapidity of ultrasonic wave gas meter response when having guaranteed the frequent switch of pipeline has been guaranteed the accuracy of metering.
2, for ultrasonic wave gas meter carries out the self-correcting at zero point a kind of flow state of pipeline internal medium fast and accurately decision method is provided; Thereby realize: when pipeline internal medium is stagnated; Make ultrasonic wave gas meter can carry out the self-correcting at zero point; Guarantee the long-time stability of measuring accuracy, avoided the loaded down with trivial details of artificial demarcation simultaneously, reduced maintenance cost.
3, this method has high reliability, can avoid because the media flow state erroneous judgement that the pipeline pressure fluctuation causes is disconnected.Have only when ducted fuel gas flow, just can produce pressure reduction between two pressure transducers, the control gas meter, flow meter carries out the conversion of relevant work state, otherwise gas meter, flow meter is failure to actuate, thereby prevents effectively because the maloperation that the pipeline pressure fluctuation causes.
The present invention can use at all and require low in energy consumption, fast, the self-tuning ultrasonic wave gas meter of the zero point drift application scenario of response, uses ultrasonic wave gas meter for the family especially, and its superiority is more remarkable.
Description of drawings
Fig. 1 is the U font ultrasonic wave gas meter pressure differential monitoring synoptic diagram that the present invention relates to.
Fig. 2 is the through-type ultrasonic wave gas meter pressure differential monitoring synoptic diagram that the present invention relates to.
Fig. 3 is that the pressure differential signal that the present invention relates to is connected synoptic diagram with ultrasonic wave gas meter.
Fig. 4 is a ultrasonic wave gas meter working mode change schematic diagram of mechanism of the present invention.
Fig. 5 is a ultrasonic wave gas meter standby mode principle of work synoptic diagram of the present invention.
Fig. 6 is a ultrasonic wave gas meter measurement pattern principle of work synoptic diagram of the present invention.
Fig. 7 is a ultrasonic wave gas meter correction mode principle of work synoptic diagram of the present invention.
Wherein: 1. enter the mouth 2. outlet, 3A. first pressure transducer, 3B. second pressure transducer, 4. ultrasonic transducer; 5.U the font ultrasonic wave gas meter, 5 '. through-type ultrasonic wave gas meter, 6. shrink pipeline section, 7. pressure difference signal, 8. preset value electric signal; 9. signal comparator, 10. interrupt interface, 11. standby modes, 11A. Single-chip Controlling unit, 11B. flow display module; 11C. the flow measurement module, 11D. correction module, 11E. ultrasonic transducer, 12. measurement patterns, 12A. Single-chip Controlling unit; 12B. the flow display module, 12C. flow measurement module, 12D. correction module, 12E. ultrasonic transducer; 13. correction mode, 13A. Single-chip Controlling unit, 13B. flow display module, 13C. flow measurement module; 13D. correction module, 13E. ultrasonic transducer, 14. negative edge interrupt service routines, 15. rising edge interrupt service routines.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Like Fig. 1, shown in Figure 2; Measure pipeline section near inlet 1 and the difference setting pressure sensor 3A of outlet 2 places, 3B at ultrasonic wave gas meter; Be used for monitoring in real time the inlet 1 of gas meter, flow meter and the pressure differential between the outlet 2; Flow through the pressure differential of flow resistive element generation and square physical phenomenon that is directly proportional of velocity of medium according to the fluid mechanics medium, utilize institute's measuring pressure difference and situation of change thereof to judge that fast pipeline internal medium is in the still dead state that flows.When the pressure differential between the inlet 1 of ultrasonic wave gas meter and the outlet 2 during, think that the pipeline medium is in flow state greater than preset value; When pressure differential numerical value during, think that the pipeline medium stays cool less than preset value.
Key structure of the present invention is the flow resistive element between ultrasonic wave gas meter two pressure transducer 3A, 3B and the two sensorses being implanted into.Wherein pressure transducer can be made up of single pressure sensor or networks of pressure sensors, and the first pressure transducer 3A is installed on inlet 1 place in the gas meter, flow meter, and the second pressure transducer 3B is installed on gas meter, flow meter inner outlet 2 places.For U font ultrasonic wave gas meter 5, directly utilize U font measuring channel as flow resistive element, produce the pressure differential between inlet 1 and the outlet 2; For through-type ultrasonic wave gas meter 5 ', be provided with in addition and shrink pipeline section 6 as flow resistive element, be used to produce inlet 1 and the pressure differential that exports between 2.
Like Fig. 1, shown in Figure 2, be ultrasonic wave gas meter pressure differential monitoring synoptic diagram, comprise the inlet 1 of ultrasonic wave gas meter, outlet 2, pressure transducer 3A, 3B, ultrasonic transducer 4, U font ultrasonic wave gas meter 5, through-type ultrasonic wave gas meter 5 ', shrink pipeline section 6.Wherein shrink pipeline section 6 only through-type ultrasonic wave gas meter 5 ' in need to be provided with, be used to produce the pressure differential between the gas meter, flow meter gateway.
When the gas pipeline outlet valve was closed, combustion gas stayed cool in the pipeline, according to pascal's principle; In the closed container; Pressure in the stationary fluid equates everywhere, so the pressure at the inlet 1 of ultrasonic wave gas meter and outlet 2 places equates and equal the supply gas pressure of gas pipeline, promptly
P
BC＝P
AC＝P
S (1)
P wherein
BCUltrasonic wave gas meter exports the pressure that 2 B of place are ordered, P when closing for the gas pipeline outlet valve
ACThe gas meter, flow meter pressure that 1 A of place is ordered that enters the mouth when closing for the gas pipeline outlet valve, P
SSupply gas pressure for gas pipeline.
Pressure differential Δ P between this moment ultrasonic wave gas table entry and outlet
CFor
ΔP
C＝P
AC-P
BC＝0 (2)
When the user used combustion gas, the valve in gas pipeline exit was opened, and directed flow is done in combustion gas in pipeline.According to fluid mechanics knowledge, when crossing flow resistive element, MEDIA FLOW will produce the pressure loss, and square being directly proportional of the pressure differential that produces and velocity of medium.The force value at outlet 2 places of ultrasonic wave gas meter will be lower than the force value at inlet 1 place of gas meter, flow meter at this moment, promptly will produce pressure reduction between the two.According to Bernoulli equation, behind the opening of valves, the flow velocity V that B is ordered
BOSatisfy following formula:
V wherein
AO, V
BOThe flow velocity of A, the place's combustion gas of B point among Fig. 1 and Fig. 2 when opening for the gas pipeline outlet valve, P
AO, P
BOThe pressure at A, B point place among Fig. 1 and Fig. 2 when opening for the gas pipeline outlet valve, ρ is the density of combustion gas.
By the mass conservation, have:
S
AV
AO＝S
BV
BO (4)
S wherein
A, S
BFor the inner hole section of A, B point place pipeline among Fig. 1 and Fig. 2 long-pending.
The inlet 1 of ultrasonic wave gas meter and the pressure differential Δ P between the outlet 2 when convolution (3), (4) can get the unlatching of gas pipeline outlet valve
OFor
Can try to achieve the gas pipeline outlet valve when opening by formula (5), at theoretical Peak Flow Rate V
BOMAXMaximum differential pressure value Δ P between the inlet 1 of following gas meter, flow meter and the outlet 2
OMAXBecause the installation site of pressure transducer 3A, 3B is nearer from gas meter, flow meter inlet, outlet, so the pressure difference between ultrasonic wave gas table entry and outlet is approximately equal to the detected pressure difference of pressure transducer.
Know that by formula (2) the pressure differential preset value should be made as 0, but, prevent maloperation, the pressure differential preset value is taken as maximum differential pressure value Δ P in order to improve the reliability of ultrasonic wave gas meter
OMAX1/10～1/20, maximum differential pressure value Δ P wherein
OMAXCan try to achieve according to formula (5).
As shown in Figure 3; The inlet 1 of ultrasonic wave gas meter and the pressure difference signal 7 that exports between 2 are inserted signal comparator 9 anodes; Preset value electric signal 8 inserts signal comparator 9 negative terminals, when the magnitude of voltage of pressure difference signal 7 is higher than the magnitude of voltage of preset value electric signal 8, and signal comparator 9 output high level; When the magnitude of voltage of pressure difference signal 7 is lower than the magnitude of voltage of preset value electric signal 8, signal comparator 9 output low levels.With the real-time sign that signal comparator 9 output begins to flow as pipeline internal medium to the rising edge of high level conversion from low level, the real-time sign that output stops to flow as pipeline internal medium to the negative edge of low transition from high level.
Like Fig. 3, shown in Figure 4, the output signal of signal comparator 9 is inserted the interrupt interface 10 of ultrasonic wave gas meter.When ultrasonic wave gas meter when signal comparator 9 output terminals receive the negative edge signal that the sign medium stops to flow, stop flow metering through negative edge interrupt service routine 14, get into standby mode 11 or correction mode 13.When ultrasonic wave gas meter from signal comparator 9 output terminals receive the sign medium begin to flow the rising edge signal time, through rising edge interrupt service routine 15 gas meter, flow meter is switched to measurement pattern 12 from standby mode 11, carry out flow metering.
As shown in Figure 5, the internal processes by ultrasonic wave gas meter when initial produces a negative edge signal, and negative edge interrupt service routine 14 is activated for the first time, and this moment, gas meter, flow meter was set to standby mode 11.11A sends control signal by the Single-chip Controlling unit, makes flow display module 11B operate as normal, and flow measurement module 11C, correction module 11D, ultrasonic transducer 11E then do not work.Thus, make unnecessary module be in holding state, no longer work, thereby reduce the power consumption of ultrasonic wave gas meter widely.
As shown in Figure 6, when rising edge interrupt service routine 15 was activated, gas meter, flow meter was set to measurement pattern 12.12A sends control signal by the Single-chip Controlling unit, makes flow display module 12B, flow measurement module 12C, ultrasonic transducer 12E operate as normal, and correction module 12D does not then work.Because pressure transducer detects the rapid speed that pressure changes in the pipeline, only need select the higher pressure transducer of sensitivity for use, just can significantly improve the response speed of gas meter, flow meter, the rapidity during the frequent switch of assurance user.
As shown in Figure 7, when negative edge interrupt service routine 14 is activated and is not when being activated first, gas meter, flow meter is set to correction mode 13.13A sends control signal by the Single-chip Controlling unit, makes flow display module 13B, correction module 13D work, and flow measurement module 13C, ultrasonic transducer 13E only work once.After accomplishing zero correction, ultrasonic wave gas meter returns to standby mode 11 rapidly.
In sum; The method that the present invention proposes; Measure in the pipeline section pressure difference and pressure reduction situation of change through measuring ultrasonic wave gas meter near the entrance and exit place; The judgement pipeline internal medium is in the still dead state that flows fast, thereby realizes the conversion of three kinds of mode of operations of gas meter, flow meter, reaches the purpose that reduces gas meter, flow meter power consumption, raising response speed, realizes the self-correction at zero point.
Claims (6)
1. pipeline internal medium flow state decision method that is used for ultrasonic wave gas meter; It is characterized in that: the inlet (1) at ultrasonic wave gas meter locates to install first pressure transducer (3A); Outlet (2) locates to install second pressure transducer (3B); Monitor the inlet (1) of ultrasonic wave gas meter and the pressure differential between the outlet (2) in real time through two pressure transducers, judge that according to institute's measuring pressure difference and situation of change thereof pipeline internal medium is in the still dead state that flows.
2. a kind of pipeline internal medium flow state decision method that is used for ultrasonic wave gas meter according to claim 1; It is characterized in that: described pressure differential and situation of change monitoring method thereof are based on the fluid mechanics medium and flow through the pressure differential of flow resistive element generation and square physical phenomenon that is directly proportional of velocity of medium; The pressure differential of locating when the inlet (1) of ultrasonic wave gas meter and outlet (2) thinks that the pipeline medium is in flow state during greater than preset value; When pressure differential numerical value during, think that the pipeline medium stays cool less than preset value.
3. a kind of pipeline internal medium flow state decision method that is used for ultrasonic wave gas meter according to claim 1; It is characterized in that: when described ultrasonic wave gas meter is U font ultrasonic wave gas meter (5); Directly utilize U font measuring channel as flow resistive element, produce the pressure differential between inlet (1) and the outlet (2).
4. a kind of pipeline internal medium flow state decision method that is used for ultrasonic wave gas meter according to claim 1; It is characterized in that: when described ultrasonic wave gas meter is through-type ultrasonic wave gas meter (5 '); Between inlet (1) and outlet (2), be provided with in addition and shrink pipeline section (6), be used for producing the pressure differential between inlet (1) and the outlet (2) as flow resistive element.
5. a kind of pipeline internal medium flow state decision method that is used for ultrasonic wave gas meter according to claim 1; It is characterized in that: the foundation that described pipeline internal medium flow state is judged is that the pressure difference signal (7) between inlet (1) and the outlet (2) is inserted signal comparator (9) anode; Preset value electric signal (8) inserts signal comparator (9) negative terminal; When the magnitude of voltage of pressure difference signal (7) is higher than the magnitude of voltage of preset value electric signal (8); Signal comparator (9) output high level, when the magnitude of voltage of pressure difference signal (7) is lower than the magnitude of voltage of preset value electric signal (8), signal comparator (9) output low level; The real-time sign that the rising edge that signal comparator (9) output is changed to high level from low level begins to flow as pipeline internal medium; The real-time sign that signal comparator (9) output is stopped to flow as pipeline internal medium to the negative edge of low transition from high level.
6. a kind of pipeline internal medium flow state decision method that is used for ultrasonic wave gas meter according to claim 5; It is characterized in that: signal comparator (9) output signal is inserted ultrasonic wave gas meter interrupt interface (10); When ultrasonic wave gas meter (5) from signal comparator (9) output terminal receive the sign medium stop to flow the negative edge signal time; Stop flow metering through negative edge interrupt service routine (14), get into standby mode (11) or get into correction mode (13); When ultrasonic wave gas meter from signal comparator (9) output terminal receive the sign medium begin to flow the rising edge signal time; Through rising edge interrupt service routine (15) gas meter, flow meter is switched to measurement pattern (12) from standby mode (11), carry out flow metering.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415225A (en) * | 2020-11-12 | 2021-02-26 | 中铁第一勘察设计院集团有限公司 | Method for judging water flow in water supply pipeline of passenger bolt |
| CN113295321A (en) * | 2021-05-26 | 2021-08-24 | 江苏大学 | Embedded runner type micro-cantilever sensor and detection method |
| CN113405620A (en) * | 2021-08-20 | 2021-09-17 | 成都千嘉科技有限公司 | Method for reducing ultrasonic meter power consumption based on zero flow identification and zero flow calibration |
| CN114459554A (en) * | 2022-04-11 | 2022-05-10 | 杭州先锋电子技术股份有限公司 | Method for improving instantaneous flow metering precision of ultrasonic gas meter based on pressure data |
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Application publication date: 20120711 |