CN203745052U - Container parallel connection and reversing valve type pVTt method gas flow device - Google Patents

Container parallel connection and reversing valve type pVTt method gas flow device Download PDF

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Publication number
CN203745052U
CN203745052U CN201420136804.XU CN201420136804U CN203745052U CN 203745052 U CN203745052 U CN 203745052U CN 201420136804 U CN201420136804 U CN 201420136804U CN 203745052 U CN203745052 U CN 203745052U
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valve
pipe
container
header
volumetric standard
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CN201420136804.XU
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龚中字
陈风华
龚磊
吴明清
李霞
江宁
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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 container parallel connection and reversing valve type pVTt method gas flow device. The container parallel connection and reversing valve type pVTt method gas flow device comprises a standard container, a buffer container, an intelligent collecting system, a front gathering pipe and a back gathering pipe. An inlet end valve, a valve for combined selection and an outlet end valve are arranged on the standard container, a testing pipe is arranged on the front gathering pipe, and a spraying nozzle clamping section is arranged between the front gathering pipe and the back gathering pipe; an air outlet of the back gathering pipe is respectively connected with one end of a connecting pipe and one end of a by-pass pipe, the other end of the connecting pipe is connected with the outlet end valve, and the other end of the by-pass pipe is communicated with an air inlet of the buffer container; the intelligent collecting system collects the pressure and the temperature in the standard container, at the position of a tested instrument installation opening and in the testing pipe, the front gathering pipe and the back gathering pipe before and after air inflation and the air inflation time. By means of the container parallel connection and reversing valve type pVTt method gas flow device, a critical flow flowmeter can be detected with a static method, various gas flowmeters can be detected with a dynamic method, and particularly high-accuracy standard meters can be detected.

Description

Container parallel connection and reversal valve formula pVTt method gas flow meter
Technical field
The utility model relates to a kind of detection of gas flow rate device, relates in particular to a kind of container parallel connection and reversal valve formula pVTt method gas flow meter.
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, simple standard set-up and the equipment of the magnitude tracing of the critical flow such as Venturi nozzle, the sonic nozzle flowmeter using usually used as secondary standard.
At present, no matter test pressure is the pVTt method gas flow meter of malleation or negative pressure, requires inflation front and back volumetric standard internal pressure must not be greater than critical pressure ratio γ with the ratio of tested instrument place pressure when detection *, this γ *the structures of value and test(ing) medium, pressure, tested critical flow gas meter etc. are relevant, conventionally γ *get between 0.528 ~ 0.85, this has also just limited existing pVTt method detection of gas flow rate application of installation and popularization.PVTt method gas flow meter remains in following problem: (1) volumetric standard is all one; (2) volumetric standard volume is less, and peak flow values is less; (3) can not examine and determine flow range degree wide and be defined as a certain scope; (4) every table apparatus only has a range ratio and flow range, not capable of being combined; (4) can only be for detection of the meter characteristic of critical flow flowmeter, can not detect other flowmeter as standard scale etc.; (5) during because of the air inlet of pVTt method gas flow meter, the flow of test pipe changes with volumetric standard internal pressure, can not control or set detection flow; (6) pVTt method gas flow meter can only adopt static method to detect flow instrument, detecting initial flow meter flow is increased to and sets detection flow value from zero, while stopping, flowmeter flow is reduced to zero from setting detection flow value, can cause that at the flowmeter detecting except critical flow flowmeter detection error is larger.
Utility model content
For above shortcomings in prior art, the utility model provides a kind of realization static method to detect critical flow flowmeter, can dynamic method detect various gas meters again, particularly the container parallel connection of pin-point accuracy standard scale and reversal valve formula pVTt method gas flow meter.
In order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
Container parallel connection and reversal valve formula pVTt method gas flow meter, comprise volumetric standard, buffer container, vacuum pump, intelligent acquisition system, front header and rear header;
Volumetric standard is two or more, is equipped with entrance point valve, combination selection valve and endpiece valve on each volumetric standard; The outlet of each entrance point valve and connection in corresponding volumetric standard, the import of each entrance point valve is as tested instrument installing port I; 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; Each volumetric standard is communicated with the air intake opening of buffer container by valve I, and buffer container is connected with vacuum pump;
Described front header is provided with at least one test pipe, on described test pipe near header to setting gradually valve K away from front header mwith tested instrument installing port II; Between described front header and rear header, be provided with at least one nozzle clamping section, described nozzle clamping section comprises nozzle, transition conduit and valve K j#; One end of described nozzle is communicated with in front header, and the other end of described nozzle is connected with one end of transition conduit, the other end of described transition conduit and valve K jone end of # connects, valve K jthe other end of # is communicated with in rear header;
The gas outlet of described rear header is connected with one end of connecting pipe and by-pass pipe respectively, and the other end of described connecting pipe is connected with the other end of each endpiece valve; The other end of described by-pass pipe is communicated with the air intake opening of buffer container, mounted valve K on described by-pass pipe f;
Described intelligent acquisition system comprise be arranged on volumetric standard, pressure transducer and temperature sensor in tested instrument installing port I place, test pipe, on front header and on rear header, the pressure transducer on described test pipe and temperature sensor are arranged on the air inlet front side of tested instrument installing port II.
As a kind of preferred version of the present utility model, mounted valve II on the pipeline that described buffer container is connected with vacuum pump.
Compared with prior art, the utlity model has following advantage:
1, propose based on pVTt measuring principle, on the basis of existing pVTt method detection of gas flow rate device design: (1) adopts multiple volumetric standards separately or is arbitrarily made with various criterion container V, realizes 1 ~ (2 n-1) combination of (n is container number) individual measurement range; (2) increase sonic nozzle group and make pressure field isolation and flow set; (3) increase reversal valve, by-pass pipe and control system; (4) increase test pipe, detect the flow instrument of different bores.Develop a set of volume combination and reversal valve formula pVTt method gas flow meter, realization can static method detects critical flow flowmeter, again can dynamic method detects the standard scale of various gas meters, particularly pin-point accuracy.
2, this device is based on pVTt method and " reversal valve " detection of dynamic principle, and device Plays container is made up of n container, adopts sonic nozzle assembly to carry out pressure field isolation and flow regulation and setting, makes device both can be used as 2 n-1 cover pVTt method detection of gas flow rate device, can be used as again sonic nozzle detection of gas flow rate device and uses, and a covering device has 2 nthe technical characteristic of device.In testing process, use " reversal valve " to control gas flow and realize particularly proving flowmeter of pVTt subtraction unit energy detection of dynamic gas flow instrument.In this measurement device: the uncertainty of measurement of pVTt subtraction unit can reach U=0.065%, k=2, can detect 0.2 grade and following critical flow flowmeter (containing sonic nozzle) and other various gas flow instrument; The uncertainty of measurement of sonic nozzle detection of gas flow rate device can reach U=0.25%, k=2, can detect 1 grade and following various gas flow instrument.
3, this flow apparatus is equivalent to 2 n-1 cover pVTt method, also can use as the sonic nozzle multiple process gas flow meter of a set of corresponding discharge scope separately simultaneously, floor area is less, cost is lower, flow range is capable of being combined, test flow can reconcile and set, and can detect various gas flow instrument, will contribute to the promotion and application of pVTt subtraction unit.
Brief description of the drawings
Fig. 1 is container parallel connection and reversal valve formula pVTt method gas flow meter (negative pressure) schematic diagram;
Fig. 2 is container parallel connection and reversal valve formula 20m 3pVTt method gas flow meter (negative pressure) schematic diagram.
In figure: 1-tested instrument (as nozzle); 2-volumetric standard (built-in m props up temperature sensor); 3-valve I; 4-vacuum pump; 5-valve II; 6-buffer container; 7-intelligent acquisition system; 8-control system; 9-connecting pipe; 10-by-pass pipe; 11-rear header; 12-transition conduit; 13-flow set nozzle; 14-front header; 15-rear straight length; 16-tested instrument (standard scale); 17-test pipe.
In Fig. 2: the volume of volumetric standard 2 is V 1=10 m 3(built-in 30 temperature sensors), V 2=20 m 3(built-in 50 temperature sensors) two kinds of specifications; Test pipe 17 has adopted Ф 200~Ф 300, Ф 80~Ф 150,65 3 kinds of combination specifications of Ф 15~Ф.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is container parallel connection and reversal valve formula pVTt method gas flow meter (negative pressure) schematic diagram, comprises volumetric standard, buffer container, vacuum pump, intelligent acquisition system, front header and rear header.
Volumetric standard is two or more, is equipped with entrance point valve, combination selection valve and endpiece valve on each volumetric standard.The outlet of each entrance point valve and connection in corresponding volumetric standard, the import of each entrance point valve is as tested instrument installing port I.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, each volumetric standard is communicated with the air intake opening of buffer container by valve I, and buffer container is connected with vacuum pump, mounted valve II on the pipeline being connected with vacuum pump at buffer container.
Front header is provided with at least one test pipe, on test pipe near header to setting gradually valve K away from front header mwith tested instrument installing port II.Between front header and rear header, be provided with at least one nozzle clamping section, nozzle clamping section comprises nozzle, transition conduit and valve K j#.One end of nozzle is communicated with in front header, and the other end of nozzle is connected with one end of transition conduit, the other end of transition conduit and valve K jone end of # connects, valve K jthe other end of # is communicated with in rear header.The gas outlet of rear header is connected with one end of connecting pipe and by-pass pipe respectively, and the other end of connecting pipe is connected with the other end of each endpiece valve; The other end of by-pass pipe is communicated with the air intake opening of buffer container, mounted valve K on by-pass pipe f.
Intelligent acquisition system comprise be arranged on volumetric standard, pressure transducer and temperature sensor in tested instrument installing port I place, test pipe, on front header and on rear header, the pressure transducer on test pipe and temperature sensor are arranged on the air inlet front side of tested instrument installing port II; Intelligent acquisition system obtains testing result for union processing such as the pressure p in volumetric standard before and after Real-time Collection inflation, in tested instrument installing port I place and test pipe, front header and rear header and temperature T and inflationtime t, humidity.Control system is used for controlling entrance point valve, combination is selected with valve, endpiece valve, valve I, valve II, valve K f, valve K mwith valve K jthe selection of the switch of #, the start and stop of vacuum pump and nozzle.
Explanation to Fig. 1:
1, orthobaric volume V is by 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, control K 1,1/ K 1,2~K n, 1/ K n, 2realize independently using and being used in combination of volumetric standard.Sonic nozzle is made pressure field isolation, flow control and setting, K 1,2~K n, 2with by-pass valve K fcomposition reversal valve group, increases various bore test pipes and detects the flowmeter of various bores, model specification.Automatically control admission line valve and by-pass line valve realization " the logical reversal valve in n position one " function by control system, utilize " reversal valve " principle of work to realize at the particularly standard scale of pin-point accuracy of pVTt method gas flow meter detection of dynamic flow instrument.
2, K 1~K mfor tested flowmeter is selected valve.K 1,0~K n, 0open K 1,1~K n, 1and K 1,2~K n, 2close, realize and detect critical flow flowmeter (as nozzle) in Static Detection mode.K 1,1~K n, 1and K 1,2~K n, 2open K 1,0~K n, 0close, do pressure field isolation with nozzle, flow control and setting, adopt static state or detection of dynamic mode to detect the tested flowmeter of various model specifications.
3, Z 1~Z jfor the sonic nozzle of different opening diameter d and flow, these nozzles are by volumetric standard Pressure Field and the isolation of tested instrument place pressure field; K 1#~K j# is high vacuum valve, controls the switch controls of these valves and sets flow.Adopt sonic nozzle as the isolator of volumetric standard Pressure Field and tested instrument place pressure field, make tested instrument place pressure can not be subject to volumetric standard internal pressure change and suddenly change, protect tested instrument can not destroy because pressure jump and flow suddenly change.Use sonic nozzle group and corresponding bore valve sets to carry out flow control, adjusting, setting in volumetric standard upstream.Sonic nozzle standard state lower volume flow is 0.5 m 3/ h, 1 m 3/ h, 2 m 3/ h ... 2 (m-1)m 3/ h(m is nozzle number), ensure that in maximum flow be 2 mm 3/ h scope is all adjustable with interior detection flow, the state flow that the sensitivity of flow regulation is minimum nozzle.Large header is all set before and after sonic nozzle group, so that gaging nozzle stagnation pressure and temperature while using.At front header, place sets up corresponding test section according to uninterrupted, measuring instrument bore etc.
4, K 1,2~K n, 2, K fcomposition " the logical reversal valve in n position one ".K 1,0~K n, 0when normal closing: gas flow is through tested table, selection nozzle Z i, after rear header, work as K 1,2~K n, 2close by-pass valve K fopen, gas enters buffer container through by-pass pipe, and the gas in buffer container is also taken away by vacuum pump; According to detecting uninterrupted combination V 1~V nvolumetric standard is also controlled corresponding K 1,2~K n, 2switch, cuts out by-pass valve K finflate to choosing in volumetric standard.
5, p, T, t are respectively pressure, temperature and time is measured; ↓, ↑, ← be gas flow.
6, buffer container can be made up of one or more pressure vessels according to device uninterrupted.
7, control system is for by-pass valve control switch, nozzle selection, vacuum pump start and stop etc.
8, intelligent acquisition system in volumetric standard before and after Real-time Collection inflation, the union processing such as the pressure and temperature at the installing port place of tested instrument and inflationtime, humidity obtains testing result.
This device is by combined type volumetric standard group, and " the logical reversal valve in n position one ", front and back header, nozzle assembly and switching pipeline thereof, flow instrument detect the compositions such as pipeline, work source of the gas, acquisition system, control system.Work source of the gas can have the generation such as vacuum pump, air compressor machine, also can be connected to external vacuum source or high-pressure air source.As required, design the test pipe of different bores and be arranged on before front header, every test pipe is made up of front and back straight length, valve, pressure and temp pressure interface etc., and tested flow instrument is arranged between the straight length of front and back.Between front header and rear header, determine nozzle installation quantity n and n nozzle clamping section is installed according to device flow range and flow set sensitivity.Each nozzle clamping section is by nozzle, transition section, the compositions such as valve.Front header and the equal setting pressure temperature of rear header pressure interface, in Control Nozzle clamping section, flow can be controlled and set to valve.
Fig. 2 is container parallel connection and reversal valve formula 20m 3pVTt method gas flow meter (negative pressure) schematic diagram, this device is by 10m 3volumetric standard, 20m 3the compositions such as volumetric standard, connecting tube and valve, can detect maximum flow and reach 3000 m 30.2 grade of critical flow flowmeter (containing sonic nozzle) and the particularly standard scale of other various gas flow instrument of/h.
This device volumetric standard upstream is used sonic nozzle group to carry out stability of flow and adjusting, and nozzle sets upstream and downstream is all designed with DN400 header, and cap of high-vacuum baffle valve is all installed after each nozzle, and 14 sonic nozzle standard state lower volume flows are respectively 0.5 m 3/ h, 1 m 3/ h, 2 m 3/ h ... 2048 m 3/ h, adjustable weight range (0.5~4096) m 3/ h.
Install the cap of high-vacuum baffle valve that each container entrance is all provided with DN400, between two containers, the another DN80 of use pipeline connects, 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 vacuum pump.Use 10m 3when volumetric standard, with 20m 3volumetric standard is as buffer container, by K 1,2and K fcomposition change-over valve group; Use 20m 3when volumetric standard, with 10m 3volumetric standard as buffer container by K 2,2and K fcomposition change-over valve group.Use 30m 3when volumetric standard, open vacuum pump, open 10m 3volumetric standard and 20m 3dN80 cap of high-vacuum baffle valve K between volumetric standard 1,1, K 2,1, by K 1,2, K 2,2and K fcomposition change-over valve group.
Device uses the Rosemount absolute pressure transducer of 3 0.04 grade to measure respectively 10m altogether 3container is interior, 20m 3container is interior, instrument place pressure, uses 3 16 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 uses 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 (2)

1. container parallel connection and reversal valve formula pVTt method gas flow meter, is characterized in that: comprise volumetric standard, buffer container, vacuum pump, intelligent acquisition system, front header and rear header;
Volumetric standard is two or more, is equipped with entrance point valve, combination selection valve and endpiece valve on each volumetric standard; The outlet of each entrance point valve and connection in corresponding volumetric standard, the import of each entrance point valve is as tested instrument installing port I; 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; Each volumetric standard is communicated with the air intake opening of buffer container by valve I, and buffer container is connected with vacuum pump;
Described front header is provided with at least one test pipe, on described test pipe near header to setting gradually valve K away from front header mwith tested instrument installing port II; Between described front header and rear header, be provided with at least one nozzle clamping section, described nozzle clamping section comprises nozzle, transition conduit and valve K j#; One end of described nozzle is communicated with in front header, and the other end of described nozzle is connected with one end of transition conduit, the other end of described transition conduit and valve K jone end of # connects, valve K jthe other end of # is communicated with in rear header;
The gas outlet of described rear header is connected with one end of connecting pipe and by-pass pipe respectively, and the other end of described connecting pipe is connected with the other end of each endpiece valve; The other end of described by-pass pipe is communicated with the air intake opening of buffer container, mounted valve K on described by-pass pipe f;
Described intelligent acquisition system comprise be arranged on volumetric standard, pressure transducer and temperature sensor in tested instrument installing port I place, test pipe, on front header and on rear header, the pressure transducer on described test pipe and temperature sensor are arranged on the air inlet front side of tested instrument installing port II.
2. container parallel connection according to claim 1 and reversal valve formula pVTt method gas flow meter, is characterized in that: mounted valve II on the pipeline that described buffer container is connected with vacuum pump.
CN201420136804.XU 2014-03-25 2014-03-25 Container parallel connection and reversing valve type pVTt method gas flow device Active CN203745052U (en)

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CN201420136804.XU CN203745052U (en) 2014-03-25 2014-03-25 Container parallel connection and reversing valve type pVTt method gas flow device

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CN201420136804.XU CN203745052U (en) 2014-03-25 2014-03-25 Container parallel connection and reversing valve type pVTt method gas flow device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105973350A (en) * 2016-04-28 2016-09-28 中国核动力研究设计院 Dynamic response characteristic self-checking device of fluid flowmeter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105973350A (en) * 2016-04-28 2016-09-28 中国核动力研究设计院 Dynamic response characteristic self-checking device of fluid flowmeter
CN105973350B (en) * 2016-04-28 2019-05-21 中国核动力研究设计院 A kind of fluid flowmeter dynamic response characteristic self-checking unit

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