CN202533109U - Wide range precession vortex gas flowmeter - Google Patents
Wide range precession vortex gas flowmeter Download PDFInfo
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- CN202533109U CN202533109U CN2012201171579U CN201220117157U CN202533109U CN 202533109 U CN202533109 U CN 202533109U CN 2012201171579 U CN2012201171579 U CN 2012201171579U CN 201220117157 U CN201220117157 U CN 201220117157U CN 202533109 U CN202533109 U CN 202533109U
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Abstract
The utility model belongs to the technical field of gas flowmeters, in particular to a wide range precession vortex gas flowmeter, which comprises a venturi tube shell, a vortex generator, a despinner, a pressure sensor, a flow sensor and an integrating instrument, wherein the vortex generator and the despinner are respectively arranged on the initiating end and a tail end, the pressure sensor, the flow sensor and the integrating instrument are arranged on the inner wall of the venturi tube shell, the integrating instrument comprises a microprocessor and a signal collection unit, the pressure sensor is connected onto the signal collection unit, and a thermal acceleration sensor is further arranged on the inner wall of the venturi tube shell. A gating circuit which is connected onto the microprocessor is arranged in the integrating instrument, and is provided with two input ends which are connected with the flow sensor and the thermal acceleration sensor at the same time. The thermal acceleration sensor is arranged in an existing precession vortex gas flowmeter, the flow sensor and the thermal acceleration sensor are integrated together by arranging the gating circuit in the integrating instrument, and the microprocessor controls different sensors to work according to size of the flow, thereby broadening range of the flow sensor.
Description
Technical field
The utility model belongs to the gas meter technical field, relates in particular to a kind of wide-range precession vortex gas meter.
Background technology
At present, all gases flow-meter produced of the flow instrument producer of main flow in the world, because on the measuring principle, the limitation of separate unit instrument flow measurement range.All about 1: 30, the range ability of having only thermal gas flowmeter and Roots type flowmeter is than broad, generally about 1: 200 for general range.And; Because often appearring in the air-flow velocity in the gas pipeline, too fast and slow excessively situation takes place; Surpass the flow rates that instrument can be measured; The air-flow that exceeds measures range generally all can not be noted by flow instrument accurately, and especially less than the situation of range lower limit, even basic sometimes just record is less than flow number.
In order to address the above problem, people are studying the flow instrument of wide-range always, and research direction mainly is through rational technological means the low speed flow below the existing instrument range lower limit accurately to be measured, and does not up to the present also have the adequate solution way.Just because of this, aspect the measurement of air flow rate, often on same pipeline, the instrument parallel connection of different bores is used at present, the instrument of utilizing operation valve to control different bores adapts to different flow rate.Though this way part has solved the problem that existing measuring instrument exists; But because the action of output of the flow signal of instrument and operation valve all needs a surge time; This has brought problem for the accurate measurement of air flow rate; And then, more having caused the significant wastage on starting material and the fabricating yard for the supplying party of air-flow and user have caused inconvenience, the energy-conserving and environment-protective theory of this and world's main flow is conflicted mutually.
In the sensor field solution that a kind of highly sensitive hot acceleration transducer to have occurred be the problems referred to above possibility is provided.Traditional hot accelerometer is based on electric capacity or piezo technology, is used to measure the motion of micromechanics quality structure, and this technology has certain limitation in many aspects, like surface adhesion (be called and stick), hysteresis, mechanical shock, electromagnetic interference (EMI).Expensive and complicated manufacture process also faces the challenge of some and micromechanical motion structurally associated problem; In order to address these problems; MEMSIC develops a kind of unique technique; This technology solved with tradition based on the relevant problem of the accelerometer of MEMS, utilize thermal convection technology, be the thermal convection MEMS inertial sensor of the integrated mixed signal treatment circuit of single-chip of the global first hand CMOS technology of using standard.
Its measuring principle is following: a thermal source that is placed on chip central authorities produces " the hot gas group " of a suspension in this cavity, four thermopair groups of being made up of aluminium and polysilicon are by the equidistant four direction that is placed on thermal source symmetrically simultaneously.When not receiving acceleration or horizontal positioned, its decrease of temperature steepness is center and complete symmetry with the thermal source.At this moment, the voltage that all produces because of temperature sensor is identical of all four thermopair groups is identical.Be a cavity air chamber above, because of nonaccelerated external force effect, the hot gas cumularsharolith is on Centromedian central thermal source.When the effect that receives an acceleration, hot gas group skew, originally the balance of four thermopair groups is destroyed, and its decrease of temperature steepness is to be center and the deviator of △ takes place to the right with the thermal source.Because the transitivity of free convection thermal field; The acceleration of any direction all can be upset the profile of thermal field; Thereby cause it asymmetric, this moment, difference can appear in the output voltage of four thermopair groups, and the difference of this thermopair group output voltage is directly proportional with the acceleration of being responded to.Inner at acceleration transducer, two identical acceleration signal transmission paths are arranged, one is to be used for the acceleration responded on the measured X axle, another then is to be used to measure the acceleration of being responded on the Y axle.
The inside of thermal convection formula acceleration transducer also comprises the simulating signal post processing circuitry of sensor.Through difference amplifications, temperature comparison, analog to digital conversion, digital-to-analog conversion, LPF and buffering, export the simulating signal of having amplified from the thermopair group signal of same axle, both direction; Or, directly process the signal into the I2C connection interface through difference amplification, temperature comparison and analog to digital conversion.Therefore, thermal convection formula acceleration transducer is the SOC(system on a chip) of a multicore sheet, i.e. SOC or MCM.
Device is measured the variation that is produced in the inherent heat transmission by acceleration the structure that has more quality-advantage than the conventional solid-state check and correction is provided; Utilize the gas molecule quality of proofreading because be in the MEMSIC Sensor Design; So the movable machinery structure can be eliminated in accelerometer; The theory bump limit that the MEMSIC accelerometer can bear surpasses 50000g, is 5 times more than of traditional accelerometer, has also eliminated the problem that links to each other with surface adhesion simultaneously.In addition, the MEMSIC accelerometer is not requiring special processing and test, can significantly reduce the cost of OEM, and the CMOS compatible technology of MEMSIC standard possesses high-quality preparative capacibility.Failure rate reduces thousands of times than traditional accelerometer, and such technology and manufacturing capacity have fundamentally been eliminated failure rate and other relevant manufacturing cost.
Exactly because this sensor possesses above-mentioned advantage, apply it to the measurement range problem that can solve existence in the gas flow instrument well.In conjunction with current main-stream all gases flowmeter; Use above-mentioned hot acceleration transducer and can derive multiple combined type wide-range gas meter, like wide-range precession vortex gas meter, Wide Range Gas Turbine Flowmeter, wide-range eddy currents gas meter, wide-range moment formula gas meter, wide-range V bevel-type gas meter etc.
The utility model content
The utility model provides a kind of wide-range precession vortex gas meter for solving the technical matters that exists in the known technology.
The technical scheme that the utility model is taked for the technical matters that exists in the solution known technology is: wide-range precession vortex gas meter comprises the housing of venturi tubulose, the vortex generator that lays respectively at its top and terminal and raceme, is installed in pressure transducer and flow sensor and integrating instrument on the said inner walls; Said integrating instrument comprises microprocessor and signal gathering unit; Said pressure transducer is connected to said signal gathering unit, on said inner walls, also is provided with hot acceleration transducer; Be provided with the gating circuit that is connected to said microprocessor in the said integrating instrument, said gating circuit has two input ends, is connected to said flow sensor and said hot acceleration transducer simultaneously.
The utility model can also adopt following technical scheme:
The working end of said hot acceleration transducer is positioned at said inner walls 1/4th internal diameter distance of distance.
Said hot acceleration transducer is positioned at the diffuser of said housing.
Said flow sensor is two and becomes centrosymmetric piezoelectric sensor, is positioned at the contraction section of said housing.
Said pressure transducer is positioned at the contraction section of said housing.
Advantage and the good effect that the utlity model has are: the utility model is through being provided with the hot acceleration transducer that has temperature sensor functionality concurrently in existing precession vortex gas meter; And the gating circuit that setting is connected with microprocessor in integrating instrument; Its two input ends combine flow sensor and hot acceleration transducer; Traffic conditions in the microprocessor real-time judge pipeline; When flow is in the flow sensor lower limit when following; The hot acceleration transducer work of gating makes full use of the characteristic that hot acceleration transducer is accurately measured tiny flow quantity, under not changing the integrally-built prerequisite of raw-gas flowmeter, widened former flowmeter range, solved the problem that the multilist parallel connection brings in the prior art.
Description of drawings
Fig. 1 is the system architecture synoptic diagram that the multilist parallel connection is measured in the prior art;
Fig. 2 is the structural representation of the utility model.
Among the figure: 1, heavy caliber flowrate control valve; 2, heavy caliber flowing meter; 3, small-bore flowrate control valve; 4, small-bore flowmeter; 5, integrating instrument; 6, display screen; 7, pressure transducer; 8, hot acceleration transducer; 9, vortex generator; 10, housing; 11, flow sensor; 12, raceme.
Embodiment
For further understanding summary of the invention, characteristics and the effect of the utility model, the following examples of giving an example now, and conjunction with figs. specifies as follows:
Fig. 1 is the system architecture synoptic diagram that the multilist parallel connection is measured in the prior art.On the pipeline of gas flow measurement, heavy caliber flowing meter 2 and small-bore flowmeter 4 parallel connections are used, control by heavy caliber flowrate control valve 1 and small-bore flowrate control valve 3 respectively.When gas flow hour, through the switching controls of operation valve, heavy caliber measured pipeline breaks off, small-bore measurement pipeline is opened, with to measuring than low discharge.Though this way part has solved the problem that existing measuring instrument exists; But because the action of output of the flow signal of instrument and operation valve all needs a surge time; This has brought problem for the accurate measurement of air flow rate; And then, more caused the significant wastage on starting material and the fabricating yard for the supplying party of air-flow and user have caused inconvenience.
Fig. 2 is the structural representation of the utility model wide-range precession vortex gas meter.The housing 10 that comprises the venturi tubulose; Its top and terminal are respectively equipped with vortex generator 9 and raceme 12; Wall is provided with pressure transducer 7 and flow sensor 11 within it; Pressure transducer 7 is positioned at the contraction section of housing 10, and flow sensor 11 is two and becomes centrosymmetric piezoelectric sensor, is positioned at the contraction section of housing 10.
Also comprise integrating instrument 5, this integrating instrument 5 comprises microprocessor and signal gathering unit.Pressure transducer 7 is connected to signal gathering unit.On the inwall of housing 10, also be provided with hot acceleration transducer 8, its working end is positioned at said housing 10 inwalls 1/4th internal diameter distance of distance.Be provided with the gating circuit that is connected to microprocessor in the integrating instrument 5, this gating circuit has two input ends, is connected to flow sensor 11 and hot acceleration transducer 8 simultaneously.On integrating instrument 5, also being provided with 6 pairs of measurement results of display screen shows.
Generally; Flow value in the gas piping is in the range ability of flow sensor 11; This moment, the microprocessor of integrating instrument 5 was in running order through gating circuit gating flow sensor 11; Below the flow in the gas piping was decreased to the range lower limit, microprocessor was in running order through the hot acceleration transducer of gating circuit gating 8, by it low discharge value is measured.
According to the principle of work of hot acceleration transducer 8, central authorities produce " the hot gas group " of a suspension at chip, and four thermopair groups of being made up of aluminium and polysilicon are by the equidistant four direction that is placed on thermal source symmetrically simultaneously.For the measurement that realizes carrying out gas velocity, need to obtain the relation curve of gas velocity and each thermocouple measuring temperature value through accurate mathematical modeling with this hot acceleration transducer 8.Because air-flow evenly flows in pipeline, can it be assumed to be the homogeneous medium, on two in four thermopairs of hot acceleration transducer 8 center lines that are arranged on flowmeter, one Way in another at Way out.In flowmeter, do not have air flow stream out-of-date, its decrease of temperature steepness is center and complete symmetry with the thermal source.At this moment, four all thermopair groups all produce identical voltage because of temperature sensor is identical.When air-flow flows through with certain speed; " hot gas group " has the deviator of a △ along gas flow; Promptly upset the profile of thermal field; Thereby cause it asymmetric, difference can appear in the output voltage of two thermopairs on the flowmeter center line at this moment, and the difference of this voltage is directly proportional with the gas velocity of being responded to.Set up the relational model of voltage difference between gas velocity and thermopair thus.
The air-flow velocity characteristics are in the pipeline: pipeline center flow velocity is maximum; Toward reducing gradually all around; Speed approximates zero when arriving tube wall; Therefore all be not suitable for placing hot acceleration transducer 8 near the tube wall place with near the position of center, in the present embodiment this sensor be arranged on apart from housing 10 inwalls 1/4th internal diameter distance, to reach best measurement effect.
When the hot acceleration transducer 8 of gating is worked, voltage difference calculation flow rate between the microprocessor basis thermopair that measures, and then calculate flow value.
In calculation process, also need to compensate calculating to temperature and pressure, the temperature here near the thermocouple measuring temperature value of flowmeter inlet, force value from pressure transducer 7.
Claims (5)
1. wide-range precession vortex gas meter; Comprise the housing of venturi tubulose, the vortex generator that lays respectively at its top and terminal and raceme, be installed in pressure transducer and flow sensor and integrating instrument on the said inner walls; Said integrating instrument comprises microprocessor and signal gathering unit; Said pressure transducer is connected to said signal gathering unit, is characterised in that:
On the inwall of said housing, also be provided with hot acceleration transducer;
Be provided with the gating circuit that is connected to said microprocessor in the said integrating instrument, said gating circuit has two input ends, is connected to said flow sensor and said hot acceleration transducer simultaneously.
2. according to the described wide-range precession vortex of claim 1 gas meter, it is characterized in that: the working end of said hot acceleration transducer is positioned at said inner walls 1/4th internal diameter distance of distance.
3. according to claim 1 or 2 described wide-range precession vortex gas meters, it is characterized in that: said hot acceleration transducer is positioned at the diffuser of said housing.
4. according to the described wide-range precession vortex of claim 1 gas meter, it is characterized in that: said flow sensor is two and becomes centrosymmetric piezoelectric sensor, is positioned at the contraction section of said housing.
5. according to the described wide-range precession vortex of claim 1 gas meter, it is characterized in that: said pressure transducer is positioned at the contraction section of said housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201171579U CN202533109U (en) | 2012-03-23 | 2012-03-23 | Wide range precession vortex gas flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201171579U CN202533109U (en) | 2012-03-23 | 2012-03-23 | Wide range precession vortex gas flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202533109U true CN202533109U (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201171579U Expired - Fee Related CN202533109U (en) | 2012-03-23 | 2012-03-23 | Wide range precession vortex gas flowmeter |
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| CN (1) | CN202533109U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620773A (en) * | 2012-03-23 | 2012-08-01 | 天津市胜武仪表技术有限公司 | Wide-range precession vortex gas flow meter |
| CN103542896A (en) * | 2013-11-07 | 2014-01-29 | 江苏华尔威科技有限公司 | Large diameter gas measuring meter |
| CN103940478A (en) * | 2014-04-30 | 2014-07-23 | 温州福鑫仪表有限公司 | Vortex flow meter |
-
2012
- 2012-03-23 CN CN2012201171579U patent/CN202533109U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620773A (en) * | 2012-03-23 | 2012-08-01 | 天津市胜武仪表技术有限公司 | Wide-range precession vortex gas flow meter |
| CN103542896A (en) * | 2013-11-07 | 2014-01-29 | 江苏华尔威科技有限公司 | Large diameter gas measuring meter |
| CN103940478A (en) * | 2014-04-30 | 2014-07-23 | 温州福鑫仪表有限公司 | Vortex flow meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20160323 |