CN101358871A - Actual flow circle calibrating apparatus for gas flowmeter and calibrating method thereof - Google Patents
Actual flow circle calibrating apparatus for gas flowmeter and calibrating method thereof Download PDFInfo
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- CN101358871A CN101358871A CNA2008100634478A CN200810063447A CN101358871A CN 101358871 A CN101358871 A CN 101358871A CN A2008100634478 A CNA2008100634478 A CN A2008100634478A CN 200810063447 A CN200810063447 A CN 200810063447A CN 101358871 A CN101358871 A CN 101358871A
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Abstract
The invention discloses a gas flow meter actual flow cycling detecting device and a detecting method thereof. A pipeline loop of the actual flow cycling detecting device is provided with a plurality of uniform voltage container sealing pots; a blower is arranged in the sealing pot; the air inlet of the blower penetrates out of the sealing pot to be connected with the upstream side of the pipeline loop; the air outlet of the blower is arranged in the sealing pot and the outlet of the sealing pot is connected with the downstream side of the pipeline loop; the sealing pot, a temperature controlling device, a testing system and a standard meter system are arranged in series. The invention effectively resolves the problem that the detecting condition is not consistent with the working condition to lead measurement error existing in the prior gas flow meter, breaks through the prior method which depends on a pipeline gas source or adopts compressor, has the advantages of small volume, low dissipation energy, high accuracy, and also has the characteristics of small investment, low noise, exchangeable gas and easy operation, is applicable to the testing of fuel gas and most industry gas and can be promoted and used in large range.
Description
Technical field
The present invention relates to the fields of measurement of gas flow, especially a kind of gas meter real stream circulation calibrating installation and calibration method thereof.
Background technology
Strictly say, the off-line verification result of flow instrument can only illustrate its meter characteristic under test condition, when reality use on-the-spot mounting condition, operating conditions, when environmental baseline is different from test condition, its metering performance can change to some extent, brings additional error for the flow measurement result.Have only the calibrating of online stream in fact could realize real flow instrument calibration or assignment,, could guarantee the continuous and sealing of the value transfer chain or the chain of tracing to the source because have only calibration or the assignment of this moment just really to count the influence of various factors to the flow instrument function.The essential characteristic of online real stream calibrating is that conditions such as the installation of flow instrument in calibrating and actual use, use are consistent.The employed calibration equipment of present domestic flowmeter manufacturer, the overwhelming majority adopts air dielectric to examine and determine, only a few is used the nitrogen calibrating, no matter use malleation or negative pressure device, calibrating pressure is near the atmospheric pressure basically, residing working condition causes bigger error in dipping easily at a distance of very big when using with flowmeter.Domestic have only the only a few place to have the ability that the real stream of rock gas detects, and they build near the natural valve station, utilize the pressure reduction between the gas transmission line at station, set up the dynamic calibration system, because source of the gas relies on the gas of pipeline transportation, the gas composition of using with the user exists difference, and gas composition may change at any time during calibrating, therefore strictly speaking, still there are some uncertain factors in the result of calibrating.Therefore, the real stream of the flowmeter calibrating installation of designing truly is significant.Open day be the continuous calibrating installation that patent document that June 14, publication number in 2006 are CN1788190 discloses a kind of gas mass flow measuring device, comprise flow circuits, blower system, temperature control system, standard meter system and test cell system.The test cell system connects test cell and flow circuits.Blower system receives gas-pressurized in the porch, and the high flow rate gas of outlet is flowed out in generation, simultaneously at the low pressure liter of generation between outlet that enters the mouth.Temperature control system receives the gas stream from blower system, and the temperature of pilot-gas.Test cell measurement in standard meter system and the test cell system cycles through the character of the gas in the flow circuits, and the measurement result of standard meter system can compare with the calibration testing unit with the measurement result of test cell.But this system bulk is big, and complex structure, the power of single blower fan just reach 112～224 kilowatts, and energy consumption is very big; In addition, because common blower fan is at inlet and gas can take place under the state of high pressure leaks, thereby cause the pressure of flow circuits to reduce gradually, the measurement of flowmeter can't be carried out continuously, therefore, this blower system is compressor typically, and reason is that it can bear the gas of pressurization at inlet, so cost is very high.Simultaneously, the gas flow rate in this system flow loop is controlled by blower fan directly, and rotation speed of fan generation subtle change all can influence the stable of the interior gas flow rate of flow circuits, and then the accuracy of influence measurement.
Summary of the invention
The present invention can set system according to gas, working condition that the user uses for the test condition that solves present gas meter and exist provides a kind of with the inconsistent problem that error in dipping occurs of working condition, reaches the real circulation calibrating installation that flows of gas meter of in-line calibration requirement fully.
Another object of the present invention is big for solving the volume that present gas meter calibrating installation exists, the cost height, the problem of big energy-consuming and poor accuracy and provide that a kind of volume is little, cost is low, power consumption reaches the real stream of the good gas meter of accuracy circulation calibrating installation less.
Another purpose of the present invention provides the real stream of the flowmeter circulation calibration method of the real stream of a kind of gas meter circulation calibrating installation.
The present invention reaches the concrete technical scheme that above-mentioned technical purpose adopts to be: the real stream of a kind of gas meter circulation calibrating installation, comprise feeder, air extractor, closed duct loop and the blower fan that in pipeline loop, is provided with, temperature control equipment, test macro and standard meter system, feeder and air extractor are by valve connecting tube loop, described pipeline loop is provided with jumbo pressure equalising vessel sealable tank, blower fan is arranged in the sealable tank, the blast pipe of blower fan passes the upstream side in sealable tank connecting tube loop, the air outlet of blower fan is arranged in the sealable tank, the downstream in the loop, outlet connecting pipe road of sealable tank, sealable tank, temperature control equipment, test macro and standard meter system are with the series system setting.Closed pipeline loop is set, allow gas circulate in pipeline, gas can repeat in order to measure, and so only needs a spot of gas can carry out the detection of real stream mode to flowmeter, its component of the gas that recycles simultaneously can not change, and has improved the accuracy of measuring.Jumbo pressure equalising vessel sealable tank is set in the closed circuit of gas, and the propulsion system blower fan that orders about gas flow in the pipeline loop is arranged in the sealable tank, because the volume of sealable tank is bigger, pressure in can effective balanced pipeline, the short time pressure surge that elimination is caused by rotation speed of fan variation etc., steady pressure improves accuracy of detection; Because the inside and outside differential pressure of blower fan obviously reduces, can use less blower fan to realize bigger flow simultaneously; Pressure equalising vessel has also solved the gas leakage problem under high pressure of blower fan, because blower fan is arranged in the sealable tank, even if there is gas leakage to occur, can not make system lose gas yet, thereby greatly reduce requirement to blower fan, therefore can significantly reduce the cost of system, in addition, sealable tank also has the effect that obviously reduces fan noise.In addition, the gas that satisfies the test pressure condition is provided by feeder, air extractor original residual gas in the removal system when system conversion variety classes gas, temperature control equipment is used to control the temperature of tested gas, make it reach the actual condition temperature of measured flux meter, test macro is used to install flowmeter to be measured, and the standard meter system is used to examine and determine flowmeter to be measured as benchmark.
As preferably, sealable tank is provided with frequency converter outward, and frequency converter connects blower fan by cable, and the junction of the blast pipe of blower fan and the outlet of sealable tank and pipeline loop is equipped with seal.Frequency converter is used to regulate the rotating speed of blower fan, thereby reach the purpose of gas flow rate in the controlling plumbing fixtures, make it satisfy the test condition of flowmeter, simultaneously under the less situation of test traffic, regulate the rotating speed of blower fan with frequency converter, can saves energy, avoided prior art hour to use a bypass channel to regulate flow in test traffic, and still full-speed operation and the energy dissipation that brings of blower fan.In the blast pipe of blower fan and the outlet of sealable tank and the junction of pipeline loop seal being set all, is to avoid the interference to standard meter and measured flux meter of electric signal that frequency converter and blower fan produce.Seal generally adopts elastomer connector.
As preferably, be provided with shunt valve between the blast pipe of sealable tank and blower fan, shunt valve is provided with by-pass valve.Under the very little situation of test traffic; blower fan can only maintain minimum speed under the adjusting of frequency converter; at this moment can solve the dead-time problem that the low district of flow exists by by-pass valve; the air-flow that produces in the time of can avoiding simultaneously regulating flow, the impact that air pressure causes the sealable tank inner blower by the main valve on the adjusting pipeline loop; protect equipment effectively, prolonged the serviceable life of equipment.
As preferably, temperature control equipment comprises heating arrangement and refrigerating plant, and temperature control equipment is arranged on the downstream of sealable tank.The temperature that temperature control equipment is regulated gas in the pipeline loop by heating arrangement or refrigerating plant makes it reach the actual condition temperature of measured flux meter.
As preferably, test macro is composed in parallel by the test branch road of some different tube diameters, and flowmeter to be measured is installed on the test branch road, and the two ends of flowmeter to be measured are provided with valve, be provided with air release between two valves, an end of test branch road is by corrugated tube connecting tube loop.The test branch road of different tube diameters is set, can makes a cover system can test the flowmeter of multiple caliber.Valve can be isolated flowmeter and pipeline loop, make that changing flowmeter can not produce big influence to total system, owing to only lose the seldom a part of tolerance between two valves when changing flowmeter, therefore the pressure of system and the component of gas etc. be not enough to produce the influence that changes measuring accuracy.The effect of air release is to make the pressure in the flowmeter consistent with atmospheric pressure when changing flowmeter, makes things convenient for the replacing of flowmeter.
As preferably, the standard meter system is composed in parallel by the standard meter branch road of the different range standard meters of some bands, and each standard meter branch road is provided with standard meter and valve, and an end of standard meter branch road is by corrugated tube connecting tube loop.Different range standard meters are used as benchmark, and to examine and determine flowmeter to be measured, standard meter may be used alone, can also be used in combination, and can reduce the quantity of standard meter like this, simplied system structure, and when test, valve is used for selecting suitable standard meter.
As preferably, the volume of sealable tank is 50%～70% of a pipeline loop total measurement (volume).The volume of sealable tank enough great talent has good pressure stabilization function, but the sealable tank volume is excessive, system bulk is increased, cost raises, and volume is too small, pressure stabilization function will be subjected to tangible influence, and the volume of sealable tank is 50%～70% of a pipeline loop total measurement (volume), proper selection.
As preferably, the pressure control range of the real stream of gas meter circulation calibrating installation is 0～1MPa, and temperature controlling range is 10～50 ℃, and atmospheric pressure state flow rate regulation scope is 0～25m/s, and total head state flow velocity modulation adjusting range is 0～15m/s.Above data have contained the actual working state of present most of gas meter, can carry out real gas operating mode calibrating to most of gas meter.
The calibration method of the real stream of gas meter circulation calibrating installation, the real stream of described gas meter circulation calibrating installation comprises feeder, air extractor, closed duct loop and the blower fan, temperature control equipment, test macro and the standard meter system that are provided with series system in pipeline loop, its calibration method comprises following steps:
A. the suitable test branch road in the test macro of gas meter to be measured being packed into, and open the valve at flowmeter to be measured two ends, close the valve of all the other test branch roads; This is the assembling process of flowmeter to be measured, loads onto flowmeter to be measured, and with the valve closing of all the other test branch roads, the test branch road can only have one the road in running order during test.
B. open that the valve of all the other positions makes pipeline loop unimpeded on the pipeline loop, use air extractor, remove the valve of closing behind the residual gas of pipeline loop on air extractor and the bleed-off passage the whole pipe vacuum-pumping loop; This process is to remove the residual gas of pipeline loop, prepares for pipeline loop charges into the required working gas of test.
C. use feeder that pipeline loop is charged into and the flowmeter to be measured gas that adapts, and make the pressure of pipeline loop consistent, close the valve on feeder and the air supply channel with the working condition pressure of flowmeter to be measured; This is the process that pipeline loop is charged into working gas and adjusts pipeline loop pressure, because the pressure of feeder is greater than the working condition pressure of flowmeter to be measured, can regulate the pressure of pipeline loop by air-supplying valve, when pressure surpasses, can close air-supplying valve, use the air release on the pipeline loop to reduce the interior pressure of pipeline loop.
D. select one or more standard meter branch road, make total range of standard meter and flowmeter to be measured suitable, and close the valve on all the other standard meter branch roads; Range according to flowmeter to be measured, select one or more standard meter, make total range of standard meter and flowmeter to be measured suitable, required flow range uses the accurate instrument of a road sign satisfiable when test, use the accurate instrument of a road sign, to improve measuring accuracy as far as possible.
E. start blower fan, regulate frequency converter or frequency converter and by-pass valve, make the gas flow rate in the pipeline loop reach test value, gas is heated or cool off, make gas temperature reach the working temperature of flowmeter to be measured by temperature control equipment; This is that the gas in the pipeline loop is carried out speed governing, temperature adjustment process, makes its operating mode value that reaches flowmeter, and flow velocity at first uses frequency converter to regulate, and when flow velocity is very little, when frequency converter can't be regulated, adopts adjusting by-pass valve mode to regulate flow velocity.When gas temperature is lower than the working temperature of flowmeter to be measured, use heating arrangement that gas is heated, when gas temperature is higher than the working temperature of flowmeter to be measured, use the refrigerating plant refrigerating gas, consistent until the gas temperature of pipeline loop with the working temperature of flowmeter to be measured.
F. after treating the pressure, flow velocity, temperature stabilization of pipeline loop, the measurement data of flowmeter more to be measured and standard meter is to examine and determine flowmeter to be measured.When using the multichannel standard meter to measure, the reading of standard meter is the reading sum of the accurate instrument of each road sign.
As preferably, after meter proof to be measured is finished, close the valve at flowmeter to be measured two ends, open two air releases between the valve, pull down the flowmeter of having examined and determine to be measured, load onto the not flowmeter to be measured of calibrating, close two air releases between the valve, open the valve at flowmeter to be measured two ends, can flowmeter more to be measured after stable and the measurement data of standard meter, to examine and determine new flowmeter to be measured.When changing flowmeter to be measured, can open on the test macro other test branch road, also can shut down and to be changedly go up behind the flowmeter start again and measure as the circulation passage of air-flow.Because it is very little to influences such as the gaseous tension of pipeline loop, temperature to change flowmeter, be not enough to influence the measuring accuracy of flowmeter, when therefore flowmeter is examined and determine in batches, only need to change flowmeter to be measured, the duty of proving installation need not to adjust substantially, for the flowmeter survey more than second, it is very simple and convenient that measuring process just becomes like this.For the king-sized calibrating project of batch, can do suitable adjustment according to pipeline loop pressure, variation of temperature in the test process.
Essence effect of the present invention is: it is inconsistent and the problem of error in dipping occurs that it has solved test condition that present gas meter exists and working condition effectively, simultaneously, the volume that has also solved present gas meter calibrating installation existence is big, cost height, the problem of big energy-consuming and poor accuracy.The present invention can set system according to gas, working condition that the user uses, reaches the requirement of in-line calibration fully.The present invention is at aspects such as pressure regulation, flow regulation, gas circulation, broken through the method for existing dependence pipeline source of the gas or employing compressor,, low, the advantage of high accuracy of power consumption little except that volume, also has small investment, the characteristics that noise is low, gas is replaceable, simple to operate, be applicable to the test of combustion gas and most industrial gasses, can large tracts of land promote the use of.
Description of drawings
Fig. 1 is a kind of structured flowchart of the real stream of gas meter of the present invention circulation calibrating installation.
Fig. 2 is a kind of structural representation of the real stream of gas meter of the present invention circulation calibrating installation.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings the embodiment of technical solution of the present invention is further described.
In the embodiment shown in Figure 21 as Fig. 1, the real stream of gas meter circulation calibrating installation comprises feeder, air extractor, closed duct loop 1 and the blower fan 3 that in pipeline loop 1, is provided with, temperature control equipment 5, test macro 6 and standard meter system 7, feeder gas cylinder and air extractor vacuum pump (not drawing among the figure) are respectively by angle valve connecting tube loop, angle valve is arranged on the pipeline loop at two ends of standard meter system 7, pipeline loop 1 is provided with jumbo pressure equalising vessel sealable tank 2, be respectively equipped with vacuum meter on pipeline loop 1 and the sealable tank 2, tensimeter and air release, the volume of sealable tank 2 is 60% of a pipeline loop total measurement (volume), the sealable tank volume of present embodiment is 1.2 cubic metres, and the pipeline loop total measurement (volume) that comprises sealable tank is 2 cubic metres.Blower fan 3 is roots blower (being equipped with 5.5 kilowatts of three phase electric machines), be arranged in the sealable tank 2, the blast pipe 4 of blower fan 3 passes the upstream side of sealable tank 2 connecting tube loop seals jars, the air outlet of blower fan 3 is arranged in the sealable tank 2, the downstream in the loop, outlet connecting pipe road of sealable tank 2, sealable tank 2, temperature control equipment 5, test macro 6 and standard meter system 7 are with the series system setting.The sealable tank 2 outer frequency converters 8 that are provided with, frequency converter 8 connects blower motor by cable, and the junction of the blast pipe 4 of blower fan 3 and the outlet of sealable tank 2 and pipeline loop is equipped with elastomer connector 9, also is provided with elastomer connector between blower fan 3 and the blast pipe 4.Be provided with shunt valve 10 between the blast pipe 4 of sealable tank 2 and blower fan 3, shunt valve 10 and blast pipe 4 are arranged on the same side of sealable tank, shunt valve 10 is provided with by-pass valve 11, also is provided with total valve 22 on the pipeline loop, and total valve 22 is arranged between standard meter system 7 and the sealable tank 2.
Temperature control equipment comprises heating arrangement 12 and refrigerating plant 13, and refrigerating plant 13 is a semiconductor cooler, and heating arrangement 12 and refrigerating plant 13 are arranged on the downstream of sealable tank 2.
Test macro is composed in parallel by the test branch road 14 of four different tube diameters, flowmeter 15 to be measured is installed on the test branch road 14, the two ends of flowmeter 15 to be measured are provided with between 16, two valves of valve and are provided with air release 17, and an end of test branch road is by corrugated tube 18 connecting tube loops 1.
The standard meter system is composed in parallel by three standard meter branch roads 19 with different range standard meters, and each standard meter branch road is provided with standard meter 20 and valve 21, and an end of standard meter branch road is by corrugated tube 18 connecting tube loops 1.
The pressure control range of the real stream of the gas meter of present embodiment circulation calibrating installation is 0～1MPa, and temperature controlling range is 10～50 ℃, and atmospheric pressure state flow rate regulation scope is 0～25m/s, and total head state flow velocity modulation adjusting range is 0～15m/s.Above data have contained the actual working state of present most of gas meter, can carry out real gas operating mode calibrating to most of gas meter.
When the real stream of using gases flowmeter circulation calibrating installation carries out meter proof,, and open the valve at flowmeter to be measured two ends, close the valve of all the other test branch roads simultaneously the flowmeter to be measured suitable test branch road in the test macro of packing into; With vacuum pump pipeline loop is vacuumized, close the ball valve on air inlet angle valve and the system pressure table before vacuumizing earlier, the valve of opening in total valve, by-pass valve and the standard meter system on the pipeline loop makes pipeline loop unimpeded, closes bleed angle valve and vacuum pump after reaching certain vacuum tightness.If have relatively high expectations, also can after reaching the certain vacuum degree, close bleed angle valve and vacuum pump, open the air inlet angle valve and charge into a part of working gas, close the air inlet angle valve then and repeat to vacuumize, be eliminated to guarantee the residual gas in the pipeline loop.After residual gas in the pipeline loop is removed, close bleed angle valve and vacuum pump, close the vacuum meter upper ball valve, open the air inlet angle valve and charge into working gas, open the ball valve on the tensimeter simultaneously, according to the pressure in the practical working situation adjustment pipeline loop of flowmeter to be measured, because the pressure of gas cylinder is greater than the working condition pressure of flowmeter to be measured, can regulate the pressure of pipeline loop by the reduction valve on the gas cylinder, when pressure surpasses, can close the air feed angle valve, use the air release on the pipeline loop to reduce the interior pressure of pipeline loop.After pressure regulation work is finished, close by-pass valve, select one or more standard meter branch road, make the range of total range of standard meter and flowmeter to be measured suitable, and close the valve on all the other standard meter branch roads.Required flow range uses the accurate instrument of a road sign satisfiable when test, uses the accurate instrument of a road sign as far as possible, to improve measuring accuracy.After standard meter is selected, start blower fan, regulate frequency converter, make the gas flow rate in the pipeline loop reach test value.When flow velocity is very little, when frequency converter can't be regulated, adopt the mode of regulating by-pass valve backflow portion gas to regulate flow velocity again.By temperature control equipment gas is heated simultaneously or cool off, make gas temperature also reach the working temperature of flowmeter to be measured.The heating or the cooling of gas need the regular hour, treat the pressure, flow velocity, temperature stabilization of pipeline loop after, the measurement data of flowmeter promptly more to be measured and standard meter is to examine and determine flowmeter to be measured.When using the multichannel standard meter to measure, the reading of standard meter is the reading sum of the selected accurate instrument of each road sign.When flowmeter more than two of needs calibratings, after treating that first meter proof to be measured finished, open the valve on another test branch road, close the valve at flowmeter to be measured two ends, open two air releases between the valve, pull down the flowmeter of having examined and determine to be measured, load onto the not flowmeter to be measured of calibrating, close two air releases between the valve, open the valve at flowmeter to be measured two ends, close the valve of another test on branch road, can flowmeter more to be measured after stable and the measurement data of standard meter, finish the calibrating of new flowmeter to be measured.Repeat this process, can carry out the detection of many flowmeters.Because it is very little to influences such as the gaseous tension of pipeline loop, temperature to change flowmeter, be not enough to influence the measuring accuracy of flowmeter, when therefore flowmeter is examined and determine in batches, only need to change flowmeter to be measured, the duty of proving installation need not to adjust substantially, for the flowmeter survey more than second, measure verification process and just become very simple and convenient like this.
Claims (10)
1. a gas meter flows the circulation calibrating installation in fact, comprise feeder, air extractor, closed duct loop and the blower fan that in pipeline loop, is provided with, temperature control equipment, test macro and standard meter system, feeder and air extractor are by valve connecting tube loop, it is characterized in that: described pipeline loop (1) is provided with jumbo pressure equalising vessel sealable tank (2), blower fan (3) is arranged in the sealable tank (2), the blast pipe (4) of blower fan (3) passes the upstream side in sealable tank (2) connecting tube loop, the air outlet of blower fan (3) is arranged in the sealable tank (2), the downstream in the loop, outlet connecting pipe road of sealable tank (2), sealable tank (2), temperature control equipment (5), test macro (6) and standard meter system (7) are with the series system setting.
2. the real stream of gas meter according to claim 1 circulation calibrating installation, it is characterized in that the outer frequency converter (8) that is provided with of described sealable tank (2), frequency converter (8) connects blower fan (3) by cable, and the junction of the blast pipe (4) of blower fan (3) and the outlet of sealable tank (2) and pipeline loop is equipped with seal (9).
3. the real stream of gas meter according to claim 1 circulation calibrating installation is characterized in that being provided with shunt valve (10) between the blast pipe (4) of described sealable tank (2) and blower fan (3), and shunt valve (10) is provided with by-pass valve (11).
4. the real stream of gas meter according to claim 1 circulation calibrating installation is characterized in that described temperature control equipment comprises heating arrangement (12) and refrigerating plant (13), and temperature control equipment is arranged on the downstream of sealable tank (2).
5. the real stream of gas meter according to claim 1 circulation calibrating installation, it is characterized in that described test macro is composed in parallel by the test branch road (14) of some different tube diameters, flowmeter to be measured (15) is installed on the test branch road (14), the two ends of flowmeter to be measured (15) are provided with valve (16), be provided with air release (17) between two valves, an end of test branch road is by corrugated tube (18) connecting tube loop.
6. the real stream of gas meter according to claim 1 circulation calibrating installation, it is characterized in that described standard meter system is composed in parallel by the standard meter branch road (19) of the different range standard meters of some bands, each standard meter branch road is provided with standard meter (20) and valve (21), and an end of standard meter branch road is by corrugated tube (18) connecting tube loop.
7. according to claim 1 or the real stream of 2 or 3 or 4 or 5 or 6 described gas meters circulation calibrating installation, the volume that it is characterized in that sealable tank (2) is 50%～70% of a pipeline loop total measurement (volume).
8. according to claim 1 or the real stream of 2 or 3 or 4 or 5 or 6 described gas meters circulation calibrating installation, the pressure control range that it is characterized in that the real stream of gas meter circulation calibrating installation is 0～1MPa, temperature controlling range is 10～50 ℃, atmospheric pressure state flow rate regulation scope is 0～25m/s, and total head state flow velocity modulation adjusting range is 0～15m/s.
9. the calibration method of the real stream of gas meter circulation calibrating installation, the real stream of described gas meter circulation calibrating installation comprises feeder, air extractor, closed duct loop and the blower fan, temperature control equipment, test macro and the standard meter system that are provided with series system in pipeline loop, it is characterized in that:
A. the suitable test branch road in the test macro of flowmeter to be measured being packed into, and open the valve at flowmeter to be measured two ends, close the valve of all the other test branch roads;
B. open that the valve of all the other positions makes pipeline loop unimpeded on the pipeline loop, use air extractor, remove the valve of closing behind the residual gas of pipeline loop on air extractor and the bleed-off passage the whole pipe vacuum-pumping loop;
C. use feeder that pipeline loop is charged into and the flowmeter to be measured gas that adapts, and make the pressure of pipeline loop consistent, close the valve on feeder and the air supply channel with the working condition pressure of flowmeter to be measured;
D. select one or more standard meter branch road, make total range of standard meter and flowmeter to be measured suitable, and close the valve on all the other standard meter branch roads;
E. start blower fan, regulate frequency converter or frequency converter and by-pass valve, make the gas flow rate in the pipeline loop reach test value, gas is heated or cool off, make gas temperature reach the working temperature of flowmeter to be measured by temperature control equipment;
F. after treating the pressure, flow velocity, temperature stabilization of pipeline loop, the measurement data of flowmeter more to be measured and standard meter is to examine and determine flowmeter to be measured.
10. the real stream of flowmeter according to claim 9 circulation calibration method, after it is characterized in that meter proof to be measured is finished, close the valve at flowmeter to be measured two ends, open two air releases between the valve, pull down the flowmeter of having examined and determine to be measured, load onto the not flowmeter to be measured of calibrating, close two air releases between the valve, open the valve at flowmeter to be measured two ends, can flowmeter more to be measured after stable and the measurement data of standard meter, to examine and determine new flowmeter to be measured.
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