CN203745051U - Two-position one-way reversing valve type pVTt-method gas flow device - Google Patents
Two-position one-way reversing valve type pVTt-method gas flow device Download PDFInfo
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- CN203745051U CN203745051U CN201420136783.1U CN201420136783U CN203745051U CN 203745051 U CN203745051 U CN 203745051U CN 201420136783 U CN201420136783 U CN 201420136783U CN 203745051 U CN203745051 U CN 203745051U
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 230000007704 transition Effects 0.000 claims abstract description 11
- 230000003068 static effect Effects 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 description 18
- 238000005259 measurement Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a two-position one-way reversing valve type pVTt-method gas flow device. The two-position one-way reversing valve type pVTt-method gas flow device comprises a standard container, a buffer container, a vacuum pump, an intelligent collection system, a front manifold and a rear manifold, wherein the front manifold is provided with a test pipeline; a nozzle mounting and clamping section is arranged between the front manifold and the rear manifold and comprises a nozzle, a transition pipeline and a valve; an air outlet of the rear manifold is connected with one end of a connection pipe and one end of a bypass pipe; the other end of the connection pipe is connected with the standard container; the other end of the bypass pipe is communicated with an air inlet of the buffer container; the intelligent collection system collects the pressure p, the temperature T and the air inflation time t inside the standard container, at the position of a mounting mouth I of a detected instrument, and inside the test pipeline, the front manifold and the rear manifold before and after air inflation. The two-position one-way reversing valve type pVTt-method gas flow device not only can detect critical flow meters according to a static method, but also can detect various gas flow meters according to a dynamic method, especially high-accuracy standard meters.
Description
Technical field
The utility model relates to a kind of detection of gas flow rate device, relates in particular to a kind of two one logical reversal valve formula pVTt method gas flow meters.
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) can only be for detection of the meter characteristic of critical flow flowmeter, can not detect other flowmeter as standard scale etc.; (2) 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; (3) 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 two of pin-point accuracy standard scale one logical reversal valve formula pVTt method gas flow meters.
In order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
Two one logical reversal valve formula pVTt method gas flow meters, comprise volumetric standard, buffer container, vacuum pump, intelligent acquisition system, front header and rear header; Described volumetric standard is provided with valve K
1with valve I, described valve I is connected with the air intake opening of buffer container by pipeline, and the gas outlet of described buffer container is connected with vacuum pump, valve K
1outlet and volumetric standard in be communicated with, valve K
1import as tested instrument installing port I;
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
n#; 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
none end of # connects, valve K
nthe 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 volumetric standard, mounted valve K on described connecting pipe
2; 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
3;
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) increases sonic nozzle group and makes pressure field isolation and flow set; (2) increase reversal valve, by-pass pipe and control system; (3) increase test pipe, detect the flow instrument of different bores.This device is realized and can static method be detected critical flow flowmeter, again can dynamic method detects the standard scale of various gas meters, particularly pin-point accuracy.This flow apparatus is not only a set of pVTt method, also can be used as the sonic nozzle multiple process gas flow meter of a set of corresponding discharge scope simultaneously.
2, this device, in testing process, uses " reversal valve " to control gas flow and realizes 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 device can be made pVTt method flow detector, also can be used as sonic nozzle multiple process flow apparatus and uses.Cost is low, and floor area is less, and detection efficiency is high.
3, the utility model also can and promote detectability to the transformation of the pVTt detection of gas flow rate device of existing single orthobaric volume and will play positive directive function.
Brief description of the drawings
Fig. 1 is two one logical reversal valve formula pVTt method gas flow meter (negative pressure) schematic diagrams;
Fig. 2 is two one logical reversal valve formula 20m
3pVTt method gas flow meter (negative pressure) schematic diagram.
In figure: 1-tested flowmeter (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 caliber DN250 being connected with tested instrument (as nozzle) 1; The volume V=20 m of volumetric standard 2
3, built-in 50 temperature sensors; Buffer container 6 adopts 5 m
3; The caliber DN400 of connecting pipe 9; 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 two one logical reversal valve formula pVTt method gas flow meter (negative pressure) schematic diagrams, comprises volumetric standard, buffer container, vacuum pump, intelligent acquisition system, front header and rear header.Volumetric standard is provided with valve K
1with valve I, valve I is connected with the air intake opening of buffer container by pipeline, and the gas outlet of buffer container is connected with vacuum pump, mounted valve II on the pipeline that buffer container is connected with vacuum pump.Valve K
1outlet and volumetric standard in be communicated with, valve K
1import as tested instrument installing port I.
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
n#.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
none end of # connects, valve K
nthe 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 volumetric standard, mounted valve K on connecting pipe
2.The other end of by-pass pipe is communicated with the air intake opening of buffer container, mounted valve K on by-pass pipe
3.
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 is for pressure P and temperature T and inflationtime t 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.Control system is for by-pass valve control K
1, valve K
2, valve K
3, valve I, valve K
mwith valve K
nthe selection of the switch of #, the start and stop of vacuum pump and nozzle.
Explanation to Fig. 1:
1, in figure, dotted line right-hand component is the part that the utility model increases: increase sonic nozzle and do pressure field isolation and set, increase valve K
2, valve K
3composition reversal valve, increases various bore test pipes and detects the flowmeter of various bores, model specification.On volumetric standard, increase an admission line (being connecting pipe) and valve K
2and be connected with by-pass pipe with rear header, by-pass pipe mounted valve K
3and be connected with buffer container; Automatically control the valve K on admission line by control system
2with the valve K on by-pass pipe
3realize " two one logical reversal valves " function.
2, K
1～K
mfor tested flowmeter is selected valve.K
1open K
2close, realize and detect critical flow flowmeter (as nozzle) in Static Detection mode at present.K
2open K
1close, do pressure field isolation and flow control and setting with nozzle, adopt Static and dynamic detection mode to detect the tested flowmeter of various model specifications.
3, Z
1～Z
nfor 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
nfor high vacuum valve, control the switch controls of these valves and set flow.Sonic nozzle can effectively be isolated volumetric standard Pressure Field and tested instrument place pressure field in critical pressure ratio, and tested instrument place pressure can not be suddenlyd change, and protects the tested instrument can be not destroyed because of the sudden change of pressure jump and flow.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
2, K
3composition reversal valve.K
1when normal closing: gas flow is through tested table, selection nozzle Z
i, after rear header, work as K
2close K
3open, gas enters buffer container through by-pass pipe, and the gas in buffer container is also taken away by vacuum pump; Work as K
3close K
2while opening, in volumetric standard, inflate.
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 and the union processing such as the pressure and temperature at the installing port place of tested instrument and inflationtime, humidity obtain testing result.
In Fig. 1, the dotted line left side is the volumetric standard of existing pVTt method flow detector, work source of the gas, acquisition system and 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.Dotted line the right is for increasing structure: 1, 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.2,, 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 made up of nozzle, transition section, valve etc.; 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.3, rear header is connected with by-pass pipe with connecting pipe.4, mounted valve between connecting pipe and volumetric standard, mounted valve between by-pass pipe and buffer container; These two valves are controlled realization " two logical " reversal valve function automatically by control system.
Fig. 2 is reversal valve formula 20m
3pVTt method gas flow meter (negative pressure) schematic diagram, this device can detect maximum flow and reach 2000 m
30.2 grade of critical flow flowmeter (containing sonic nozzle) and the particularly proving flowmeter 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 13 sonic nozzle standard state lower volume flows are respectively 0.5 m
3/ h, 1 m
3/ h, 2 m
3/ h ... 1024 m
3/ h, adjustable weight range (0.5～2048) m
3/ h.
In device: 20m
3the each gateway of volumetric standard and nozzle transfer valve are all selected cap of high-vacuum baffle valve, guarantee valve non-internal leakage and leak outside.
In Fig. 2: close K
2, K
3, open K
1, can be used as traditional pVTt method flow detector and use, detect critical flow flowmeter (containing sonic nozzle).Close K
1, control K
2, K
3and nozzle late gate group, can utilize pVTt method flow detector to detect the standard scale of pin-point accuracy.Close K
1, K
2, open K
3, Control Nozzle late gate group, can be used as sonic nozzle detection of gas flow rate device and uses, and detects conventional various gas flow instrument.
Device uses the Rosemount absolute pressure transducer of 3 0.04 grade to measure respectively 20m altogether
3in container, rear header, instrument place pressure, use 3 20 high-precision A/D modules to convert voltage signal to digital signal; Use 50 pt100 temperature sensor measurement 20m
3medial temperature in container, 1 pt100 temperature sensor measurement instrument place temperature, use 8017 thermal modules of 24 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. two one logical reversal valve formula pVTt method gas flow meters, comprise volumetric standard, buffer container, vacuum pump and intelligent acquisition system; Described volumetric standard is provided with valve K
1with valve I, described valve I is connected with the air intake opening of buffer container by pipeline, and the gas outlet of described buffer container is connected with vacuum pump, valve K
1outlet and volumetric standard in be communicated with, valve K
1import as tested instrument installing port I; It is characterized in that: also comprise front header and rear header;
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
n#; 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
none end of # connects, valve K
nthe 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 volumetric standard, mounted valve K on described connecting pipe
2; 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
3;
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. two one logical reversal valve formula pVTt method gas flow meters according to claim 1, is characterized in that: mounted valve II on the pipeline that described buffer container is connected with vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420136783.1U CN203745051U (en) | 2014-03-25 | 2014-03-25 | Two-position one-way reversing valve type pVTt-method gas flow device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420136783.1U CN203745051U (en) | 2014-03-25 | 2014-03-25 | Two-position one-way reversing valve type pVTt-method gas flow device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203745051U true CN203745051U (en) | 2014-07-30 |
Family
ID=51344838
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420136783.1U Expired - Fee Related CN203745051U (en) | 2014-03-25 | 2014-03-25 | Two-position one-way reversing valve type pVTt-method gas flow device |
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| Country | Link |
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| CN (1) | CN203745051U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236684A (en) * | 2014-10-16 | 2014-12-24 | 广州能源检测研究院 | Fluid reversing device and guide-in and guide-out time difference compensation method thereof |
| CN105716692A (en) * | 2016-01-26 | 2016-06-29 | 中国计量科学研究院 | Commutator for gas flow standard device and detecting method |
| CN108007534A (en) * | 2017-12-30 | 2018-05-08 | 西安长庆科技工程有限责任公司 | A kind of natural gas big flow flows verification system in fact |
| CN109211364A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of Multipurpose gas flow standard system with control equipment |
| CN109211366A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of Multipurpose gas flow standard device based on air supply system |
| CN109211369A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of pVTt method gas flow standard detection system |
| CN109211365A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of multipurpose pVTt method gas flow standard device |
| CN109211368A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of pVTt method gas flow standard system with control equipment |
| CN109211367A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of pVTt method gas flow standard device |
| CN109211371A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of pVTt method gas flow standard device based on air supply system |
| CN109211370A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of multipurpose pVTt method gas flow standard detection system |
-
2014
- 2014-03-25 CN CN201420136783.1U patent/CN203745051U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104236684A (en) * | 2014-10-16 | 2014-12-24 | 广州能源检测研究院 | Fluid reversing device and guide-in and guide-out time difference compensation method thereof |
| CN104236684B (en) * | 2014-10-16 | 2017-05-17 | 广州能源检测研究院 | Fluid reversing device and guide-in and guide-out time difference compensation method thereof |
| CN105716692A (en) * | 2016-01-26 | 2016-06-29 | 中国计量科学研究院 | Commutator for gas flow standard device and detecting method |
| CN105716692B (en) * | 2016-01-26 | 2018-12-21 | 中国计量科学研究院 | A kind of commutator and detection method for gas flow standard device |
| CN108007534A (en) * | 2017-12-30 | 2018-05-08 | 西安长庆科技工程有限责任公司 | A kind of natural gas big flow flows verification system in fact |
| CN108007534B (en) * | 2017-12-30 | 2023-12-08 | 西安长庆科技工程有限责任公司 | Natural gas high-flow real-flow verification system |
| CN109211366A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of Multipurpose gas flow standard device based on air supply system |
| CN109211369A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of pVTt method gas flow standard detection system |
| CN109211365A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of multipurpose pVTt method gas flow standard device |
| CN109211368A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of pVTt method gas flow standard system with control equipment |
| CN109211367A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of pVTt method gas flow standard device |
| CN109211371A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of pVTt method gas flow standard device based on air supply system |
| CN109211370A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of multipurpose pVTt method gas flow standard detection system |
| CN109211364A (en) * | 2018-09-28 | 2019-01-15 | 镇江市计量检定测试中心 | A kind of Multipurpose gas flow standard system with control equipment |
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| 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: 20140730 |