CN203732139U - Multi-vessel parallel-connection pVTt-method gas flow-rate detection device - Google Patents

Multi-vessel parallel-connection pVTt-method gas flow-rate detection device Download PDF

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Publication number
CN203732139U
CN203732139U CN201420136829.XU CN201420136829U CN203732139U CN 203732139 U CN203732139 U CN 203732139U CN 201420136829 U CN201420136829 U CN 201420136829U CN 203732139 U CN203732139 U CN 203732139U
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China
Prior art keywords
valve
gas flow
buffer container
volumetric
standard
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Expired - Fee Related
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CN201420136829.XU
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Chinese (zh)
Inventor
龚中字
吴明清
龚磊
陈风华
江宁
李霞
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Chongqing Academy of Metrology and Quality Inspection
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Chongqing Academy of Metrology and Quality Inspection
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Abstract

The utility model discloses a multi-vessel parallel-connection pVTt-method gas flow-rate detection device. The gas flow-rate detection device comprises two or more than two standard vessels, a buffering vessel I, an intelligent collection system and a control system; each standard vessel is respectively provided with an inlet valve, a combined selective valve and an outlet valve; an inlet of the inlet valve is used as an installation port of a detected flowmeter, each combined selective valve is communicated with each other, and the outlet valve is communicated with the buffering vessel I; P and T as well as inflated gas t in the standard vessels before and after being inflated and in the installation port of the detected flowmeter are collected by the intelligent collection system; the control system is used for controlling each valve to be opened and closed. A plurality of standard vessels are independently used as or combined at will to form different standard vessels and share one working air source and pressure, temperature and time collection system, and the range of the detection flow rate is increased by (2n-1) (n is the quantity of the vessels) times of a single traditional vessel; the cost is greatly reduced, and the detection efficiency is improved.

Description

The pVTt method detection of gas flow rate device of many volumetric standards parallel connection
Technical field
The utility model relates to a kind of detection of gas flow rate device, relates in particular to a kind of pVTt method detection of gas flow rate device of many volumetric standards parallel connection.
Background technology
PVTt method detection of gas flow rate device is a kind of widely used original level gas flow standard measuring apparatus and equipment, its class of accuracy is high, uncertainty of measurement U can reach 0.07% or higher, the Venturi nozzle using usually used as secondary standard, sonic nozzle, etc. simple standard set-up and the equipment of magnitude tracing of critical flow flowmeter.Along with detection of gas flow rate technology improve and civilian and industrial gas flowmeter body being widely used of every profession and trade, to pVTt method detection of gas flow rate device demand also increase day by day.There is following some limitation in current pVTt method detection of gas flow rate device: (1) volumetric standard is all one; (2) volumetric standard volume is less, and peak flow values is less; (3) can examine and determine the not wide and regulation of flow range degree for a certain scope; (4) every table apparatus only has a range ratio and flow range, floor area is large, work source of the gas (producing with vacuum pump or compressor) power consumption is larger; (5) detection efficiency is low.
Utility model content
For above shortcomings in prior art, the utility model provides the pVTt method detection of gas flow rate device of many volumetric standards parallel connection of a kind of various flow and range ratio, this device is equivalent to many cover pVTt devices before, and calibrating flow range is than single container expansion before 2 n-1 (n is container number) doubly more than, greatly reduce installation cost, improve detection efficiency.
In order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
The pVTt method detection of gas flow rate device of many volumetric standards parallel connection, comprises two or more volumetric standards and a buffer container I;
On each volumetric standard, be equipped with entrance point valve, combination selection valve and endpiece valve; The outlet of each entrance point valve and connection in corresponding volumetric standard, the import of each entrance point valve is as the installing port of tested flowmeter; Each combination was selected with one end of valve and corresponding interior connection of volumetric standard, and each combination is selected to be interconnected with the other end of valve; One end of each endpiece valve and connection in corresponding volumetric standard, the other end of each endpiece valve is communicated with in buffer container I;
On each volumetric standard, with the installing port place of tested flowmeter, pressure transducer and temperature sensor are set.
As a kind of preferred version of the present utility model, the gas outlet of described buffer container I is connected with vacuum pump; Valve I is set on the pipeline being connected with vacuum pump in buffer container I.
As another kind of preferred version of the present utility model, the gas outlet of described buffer container I is connected with the air intake opening of high-pressure air source or air compressor machine, the gas outlet of high-pressure air source or air compressor machine is connected with the air intake opening of buffer container II by pipeline, and the gas outlet of described buffer container II is connected with the import of entrance point valve.
As a kind of improvement project of the present utility model, described buffer container I is provided with evacuated tube, and valve II is set in described evacuated tube.
Compared with prior art, the utlity model has following advantage:
1, this device is based on pVTt measuring principle, adopt a plurality of volumetric standards separately or be arbitrarily made with various criterion container V, share a set of work source of the gas and pressure p, temperature T and time t acquisition system, this device is equivalent to many cover pVTt devices before, and calibrating flow range is than single container expansion before 2 n-1(n is container number) doubly more than; Greatly reduce installation cost, improve detection efficiency.
2, this device can regulate calibrating environment according to instrumentation condition (malleation or negative pressure), and class of accuracy is high, small investment, and utilization scope is wide.
3, the utility model also can expand and will play positive directive function the transformation of the pVTt detection of gas flow rate device of existing single orthobaric volume and range.
Accompanying drawing explanation
Fig. 1 is pVTt method detection of gas flow rate device (negative pressure) schematic diagram of many volumetric standards parallel connection;
Fig. 2 is pVTt method detection of gas flow rate device (malleation) schematic diagram of many volumetric standards parallel connection;
Fig. 3 is by 10m 3and 20m 3the combined type 30m that volumetric standard forms 3the schematic diagram of pVTt method detection of gas flow rate device.
In figure: 1-tested instrument (as nozzle); 2-volumetric standard (built-in m props up temperature sensor); 3-buffer container I; 4-valve I; 5-vacuum pump; 6-intelligent acquisition system; 7-control system; 8-valve II; 9-circular treatment; 10-high-pressure air source or air compressor machine; 11-buffer container II.
In Fig. 3: tested instrument 1 is sonic nozzle etc.; Volumetric standard 2 adopts V1=10m 3(built-in 30 temperature sensors), V2=20m 3(built-in 50 temperature sensors) two specifications; Buffer container I 3 adopts 5m 3buffer container; Vacuum pump adopts suction can reach the vacuum pump of 10Pa.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is pVTt method detection of gas flow rate device (negative pressure) schematic diagram of many volumetric standards parallel connection, comprises two or more volumetric standards, buffer container I and vacuum pump.On each volumetric standard, be equipped with entrance point valve, combination selection valve and endpiece valve; The outlet of each entrance point valve and connection in corresponding volumetric standard, the import of each entrance point valve is as the installing port of tested flowmeter; Each combination was selected with one end of valve and corresponding interior connection of volumetric standard, and each combination is selected to be interconnected with the other end of valve; One end of each endpiece valve and connection in corresponding volumetric standard, the other end of each endpiece valve is communicated with in buffer container I; The gas outlet of buffer container I is connected with vacuum pump; Valve I is set on the pipeline being connected with vacuum pump in buffer container I.On each volumetric standard and the installing port place of tested flowmeter pressure transducer and temperature sensor are set, intelligent acquisition system is in volumetric standard before and after Real-time Collection inflation and pressure p and temperature T and inflationtime t, the humidity RH etc. at the installing port place of tested flowmeter.Control system is for controlling entrance point valve, combination valve, endpiece valve and the switch of valve I and start and stop of vacuum pump for selection.
Fig. 2 is pVTt method detection of gas flow rate device (malleation) schematic diagram of many volumetric standards parallel connection, comprises two or more volumetric standards, buffer container I, high-pressure air source or air compressor machine and buffer container II.On each volumetric standard, be equipped with entrance point valve, combination selection valve and endpiece valve; The outlet of each entrance point valve and connection in corresponding volumetric standard, the import of each entrance point valve is as the installing port of tested flowmeter; Each combination was selected with one end of valve and corresponding interior connection of volumetric standard, and each combination is selected to be interconnected with the other end of valve; One end of each endpiece valve and connection in corresponding volumetric standard, the other end of each endpiece valve is communicated with in buffer container I; The gas outlet of buffer container I is connected with the air intake opening of high-pressure air source or air compressor machine, and the gas outlet of high-pressure air source or air compressor machine is connected with the air intake opening of buffer container II by pipeline, and the gas outlet of buffer container II is connected with the import of entrance point valve.Buffer container I is provided with evacuated tube, and valve II is set in evacuated tube.On each volumetric standard and the installing port place of tested flowmeter pressure transducer and temperature sensor are set, intelligent acquisition system is in volumetric standard before and after Real-time Collection inflation and pressure p and temperature T and inflationtime t, the humidity RH etc. at the installing port place of tested flowmeter.Control system is for controlling entrance point valve, combination valve, endpiece valve and the switch of valve II and start and stop of air compressor machine for selection.
Explanation to Fig. 1 and Fig. 2:
1, K1,0~Kn, 0 is the entrance point valve of volumetric standard V1~Kn, tested flowmeter is arranged on valve inlet place as far as possible.
2, K1,1~Kn, 1 is the combination selection valve of volumetric standard V1~Kn, opens Ki, combines the volumetric values of corresponding Vi at 1 o'clock.
3, K1,2~Kn, 2 is the endpiece valve of volumetric standard V1~Kn, is connected with buffer container I, during the interior gas of emptying Vi volume, opens.
While 4, using separately certain volumetric standard Vi (not being used in combination), combination is selected to use valve K1,1~Kn, and 1 all in closed condition.
5, p, T, t are respectively pressure, temperature and time is measured; → be gas flow.
6, buffer container I and buffer container II can be comprised of one or more pressure vessels according to device uninterrupted.
7, air compressor machine can be comprised of one or more air compressor machines according to device uninterrupted.
8, control system is used for by-pass valve control switch, the start and stop (Fig. 1) of vacuum pump, the start and stop (Fig. 2) of air compressor machine.
9, intelligent acquisition system in volumetric standard before and after Real-time Collection inflation and the union such as the pressure and temperature at the installing port place of tested flowmeter and inflationtime, humidity process and obtain testing result.
The water capacity customizing of take is V 1~ V nn orthobaric volume, have 2 n-a kind of combination, composition maximum volume is V=(V 1+ V 2+ ... V n) volumetric standard group.Each container V iabsolute pressure transducer of interior outfit is measuring vessel internal pressure P at any time si, then be equipped with an absolute pressure transducer measurement instrument place pressure P m; In each container, be equipped with some the temperature sensors interior medial temperature T of measuring vessel at any time si, then be equipped with a temperature sensor measurement instrument place temperature T m; With high accurate calculagraph, measure the time t that starts and finish.According to the equation of gas state, calculate each volumetric standard V in t detection time iinterior charge-air mass Δ m iwith total charge-air mass m= and by the instantaneous delivery q of measured flux meter m, the metering performance parameter of acquisition measured flux meter: as efflux coefficient C, instrument coefficient K etc.
Device both can have been used single volumetric standard (now closing other standards inlet valve of container door) while using, also can use (close other and do not select inlet valve of container door) by combination in any volumetric standard, was equivalent to have (2 n-1) plant the pVTt detection of gas flow rate device of volume, this covering device is equivalent to (2 n-1) overlap the pVTt detection of gas flow rate device of single volumetric standard.
Device can, according to tested flow-meter and a plurality of monitor stations of specifications design position (a monitor station position on each volumetric standard), overlap monitor station position more and share a set of acquisition system.
When device is examined and determine with malleation intake method, use air compressor machine to produce malleation source of the gas, as shown in Figure 2; While examining and determine with negative pressure method intake method, use vacuum pump to produce negative pressure source of the gas, as shown in Figure 1; Device can bear the malleation of (0 ~ 6) Mpa and negative pressure that vacuum tightness is 100Pa keeps normal work.
Utilize volumetric standard combined type pVTt method measuring principle, development one sleeve containes is 10m 3, 20m 3the combined type pVTt method detection of gas flow rate device of volumetric standard, as shown in Figure 3, this device maximum flow is respectively 1000m 3/ h, 2000m 3/ h, 3000m 3/ h, range ratio is respectively 1:2000,1:4000,1:6000; During detection, interactive waits for that in container, temperature is stablized, and improves detection efficiency.This measurement device uncertainty is 0.067%, can detect critical flow venturi nozzle, sonic nozzle maximum flow reaches 3000 m 3/ h is that current state internal volume is maximum, flow is maximum, the pVTt detection of gas flow rate device that range ratio is the widest.
In Fig. 3: the cap of high-vacuum baffle valve that 1, K0~K4 is corresponding bore, wherein K0, K4 generation time t detection signal.2, P, T, t are respectively pressure, temperature, time measurement.3, → be gas flow.
Install the monitor station that all has single station of the control of the cap of high-vacuum baffle valve by DN400 on each container, 2 cover monitor stations share a set of intelligent acquisition system.Between two containers, use DN80 pipeline to connect, with cap of high-vacuum baffle valve control linkage break-make.Bleed/the relief port of two containers is all provided with DN400 cap of high-vacuum baffle valve, is connected on the source of the gas main pipeline of air compressor machine/vacuum pump.
Device is used the Rosemount absolute pressure transducer of 3 0.04 grade to measure respectively 10m altogether 3container is interior, 20m 3in container and instrument place pressure, use 3 20 high-precision A/D modules to convert voltage signal to digital signal; Use 30 Pt100 temperature sensor measurement 10m 3medial temperature in container, 50 Pt100 temperature sensor measurement 20m 3medial temperature in container, 1 Pt100 temperature sensor measurement instrument place temperature, use 8017 thermal modules of 27 3 passages to convert resistance value to temperature digital signal, use 2 8520 communication modules that digital signal and computer serial communication are fed back to control program.Device is used PCX8354 card as Control card, collection/control instrument pulse signal, valve start stop signal, time.
Finally explanation is, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.

Claims (4)

1. the pVTt method detection of gas flow rate device of more than volumetric standard parallel connection, is characterized in that: comprise plural volumetric standard and a buffer container I;
On each volumetric standard, be equipped with entrance point valve, combination selection valve and endpiece valve; The outlet of each entrance point valve and connection in corresponding volumetric standard, the import of each entrance point valve is as the installing port of tested flowmeter; Each combination was selected with one end of valve and corresponding interior connection of volumetric standard, and each combination is selected to be interconnected with the other end of valve; One end of each endpiece valve and connection in corresponding volumetric standard, the other end of each endpiece valve is communicated with in buffer container I;
On each volumetric standard, with the installing port place of tested flowmeter, pressure transducer and temperature sensor are set.
2. the pVTt method detection of gas flow rate device of many volumetric standards parallel connection according to claim 1, is characterized in that: the gas outlet of described buffer container I is connected with vacuum pump; Valve I is set on the pipeline being connected with vacuum pump in buffer container I.
3. the pVTt method detection of gas flow rate device of many volumetric standards parallel connection according to claim 1, it is characterized in that: the gas outlet of described buffer container I is connected with the air intake opening of high-pressure air source or air compressor machine, the gas outlet of high-pressure air source or air compressor machine is connected with the air intake opening of buffer container II by pipeline, and the gas outlet of described buffer container II is connected with the import of entrance point valve.
4. the pVTt method detection of gas flow rate device of many volumetric standards parallel connection according to claim 3, is characterized in that: described buffer container I is provided with evacuated tube, and valve II is set in described evacuated tube.
CN201420136829.XU 2014-03-25 2014-03-25 Multi-vessel parallel-connection pVTt-method gas flow-rate detection device Expired - Fee Related CN203732139U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105159360A (en) * 2015-08-04 2015-12-16 北京航天计量测试技术研究所 Quick temperature balancing method and device for pVTt standard container
CN106153162A (en) * 2016-08-31 2016-11-23 新奥科技发展有限公司 Gas flowmeter detection equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105159360A (en) * 2015-08-04 2015-12-16 北京航天计量测试技术研究所 Quick temperature balancing method and device for pVTt standard container
CN105159360B (en) * 2015-08-04 2017-06-20 北京航天计量测试技术研究所 The Fast-Balance method and device of temperature in a kind of pVTt volumetric standards
CN106153162A (en) * 2016-08-31 2016-11-23 新奥科技发展有限公司 Gas flowmeter detection equipment
CN106153162B (en) * 2016-08-31 2020-03-06 新奥科技发展有限公司 Gas flowmeter detection equipment

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Granted publication date: 20140723