CN104132707A - Calibration system and method for volume of closed container - Google Patents

Calibration system and method for volume of closed container Download PDF

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Publication number
CN104132707A
CN104132707A CN201410355271.9A CN201410355271A CN104132707A CN 104132707 A CN104132707 A CN 104132707A CN 201410355271 A CN201410355271 A CN 201410355271A CN 104132707 A CN104132707 A CN 104132707A
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China
Prior art keywords
pressure
container
flow
valve
value
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Pending
Application number
CN201410355271.9A
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Chinese (zh)
Inventor
蔺金贤
钟志京
周银行
辉永庆
张玉川
胥全敏
李群岭
林涛
刘秀华
龙素群
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Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics
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Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics
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Application filed by Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics filed Critical Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics
Priority to CN201410355271.9A priority Critical patent/CN104132707A/en
Publication of CN104132707A publication Critical patent/CN104132707A/en
Pending legal-status Critical Current

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Abstract

The invention provides a calibration system and method for the volume of a closed container. According to the system, the container to be measured is connected with a first valve, a first hose, an air pipe, a pressure sensor, a flow sensor, a second valve, a second hose and a vacuum pump in sequence. The method comprises the steps that pressure inside the container to be measured and the pipeline and extracted air accumulated flow are continuously recorded, pressure drop in the container to be measured and the pipeline is calculated, a linear regression data processing method is adopted, a liner relation between the pressure drop in the container to be measured and the pipeline and the air accumulated flow is built, and then the volume of the container to be measured is calculated. The calibration system is simple in structure, easy and convenient to operate and capable of rapidly calibrating the volume.

Description

A kind of volumetric calibration system and method for closed container
Technical field
The invention belongs to radiation protection and environmental protection technical field, be specifically related to a kind of volumetric calibration system and method for closed container, be specially adapted to working pressure and require to be defined in the volumetric calibration of accurate container within the scope of 80kPa ~ 120kPa.
Background technology
At nuclear industry, Aero-Space and arms of precision production field, conventionally adopt all kinds of special material hold-up vessel sealed type storage test products to carry out long-term behaviour investigation.For the organic and inorganic and impact of radioactivity atmosphere on storage products performance in assessment sealed type storage container, need regularly to detect content and the total amount of some responsive atmosphere material in hold-up vessel, thereby vessel volume is to detect required call parameter.Special for inner structure complexity, out-of-shape, material, can not filling liquid etc. the special material tank container of type, conventional method for measuring volume as topping up weight method, pressure-sustaining gas substitution method, quantitatively inflation method, pressure advocate approach etc. have that measurement mechanism is too complicated, measuring accuracy not or method itself problem such as cannot apply.At present, Chinese patent literature database discloses the patent of invention that a key name is called " a kind of easy container volume method for precisely marking " (patent No.: CN200510046319.9), adopt helium as marked gas, set up the linear equation in two unknowns taking volume as unknown number according to the MBWR equation of helium and law of conservation of mass, solve and can calculate volume of a container value by multi-group data.Disclosed another the patent of invention name of Chinese patent literature database is called " a kind of air-leakage detector and utilize the method for deflation course test container internal volume " (patent No.: CN201210204439), this patent of invention adopts high-pressure air source to inflate tested container, gather the parameter such as instant pressure, temperature in deflation course by sensor, obtain vessel volume value through data processing.In addition, " a kind of device and method that utilizes pipeline space measurement vessel volume " (patent No.: CN201220500651), utilizes extract system and standard volume to realize the volumetric measurement of tested container in this patent.But above-mentioned patent needs tested container to be pumped to condition of high vacuum degree condition or to be inflated to the high-pressure state that can reach several MPas in tested container in operating process, such pressure condition may cause the damage of accurate internal tank material or member, thereby can not be applicable to the demarcation of working pressure requirement spatial volume in all kinds of accurate hold-up vessel of 80kPa ~ 120kPa.
Summary of the invention
In order to make up prior art for out-of-shape, inner structure complexity, material is special, can not filling liquid, working pressure requires the deficiency of demarcating between the container complicated interior spatial volume of precision of 80kPa ~ 120kPa, the invention provides a kind of volumetric calibration system and method for closed container, can realize and changing according to the integrated flux that extracts gas in accurate testing container in pressure limit and change in pressure drop is calculated the interior spatial volume of container by linear regression method data processing limiting, be specially adapted to the volumetric calibration that working pressure requires to be defined in accurate container within the scope of 80kPa ~ 120kPa.
The technical solution adopted for the present invention to solve the technical problems is as follows:
The volumetric calibration system of a kind of closed container of the present invention, is characterized in, described system comprises valve I, pressure transducer, flow sensor, valve II, vacuum pump, pressure display unit, flow indication controller; Its annexation is, the gas outlet of testing container is connected with one end of valve I, the other end of valve I is connected with one end of flexible pipe I by joint I, the other end of flexible pipe I is connected with one end of joint II, the other end of joint II is connected with pressure transducer, flow sensor, valve II and joint III successively by tracheae, and the other end of joint III is connected with the air intake opening of vacuum pump by flexible pipe II; Pressure transducer is connected with pressure display unit by signal wire; Flow sensor is connected with flow indication controller by signal wire.
The volumetric calibration method of a kind of closed container of the present invention, is characterized in that comprising the steps:
A) open valve I, makes original pressure in testing container and pipeline keep balance, is now designated as initial gas pressure P;
B) set by flow indication controller the flow velocity of bleeding, start the switch of vacuum pump, open valve II starts extracting gases; Measure and extract the integrated flux of gas and the flow velocity of bleeding by flow sensor;
C) in pumping process, by the gaseous tension in determination of pressure sensor testing container; When pressure display unit reading is low to moderate P 1when neighbouring, shut-off valve II, after pressure display unit stable reading, records now pressure P rapidly 1accurate numerical value and cumulative flow value Δ V 1;
D) open valve II, continue extracting gases, repeat c) process several of above-mentioned steps, obtain testing container internal pressure P in a series of pumping processes 1, P 2..., P nwith corresponding respectively cumulative flow value Δ V 1, Δ V 2..., Δ V n;
E) according to the testing container internal pressure value P obtaining 1, P 2..., P n, calculate the voltage drop value Δ P in corresponding testing container 1, Δ P 2..., Δ P n, i.e. Δ P n=P-P n.Draw Δ P-Δ V figure, data are carried out to linear regression method matching, obtain relational expression ; Wherein, a, b are the coefficient of linear fit relational expression;
F) by relational expression in initial gas pressure P value substitution e) , can calculate Δ V value now, by this value deduction manifold volume V 2, calculate the volume V of testing container 1, i.e. V 1=Δ V-V 2; Wherein V 2for manifold volume, adopt pipeline diameter and length dimension to calculate.
Described pressure transducer is air absolute pressure transducer, is transmitted tested container and is communicated with the pressure information in gas circuit to pressure display unit by signal wire; Flow sensor is the data to the integrated flux of bleed in flow indication controller transmission gas circuit flow velocity and extracting gases by signal wire; The size of flow velocity of bleeding in gas circuit set and controlled by flow indication controller by signal wire.
Pressure P in described step e) 1, P 2..., P nwithin the working pressure range that all should require at testing container; Integrated flux Δ V 1, Δ V 2..., Δ V nthe value of correspondence under local temperature and initial gas pressure P-condition while being mensuration.
Volumetric calibration side's ratio juris of a kind of closed container of the present invention is:
At a certain temperature, testing container and manifold volume can not change, when adopting vacuum pump when extracting the gas of certain volume Δ V in testing container, testing container and pipeline inner pressure can reduce, the corresponding rising of pressure drop Δ P, the cumulative volume Δ V and the pressure drop Δ P that extract gas have certain linear relationship.In the working pressure range limiting, record many groups of (Δ P, Δ V) data, adopt the data processing method of linear regression, find out this linear relationship .Suppose that in testing container and pipeline, gas is all found time, now pressure is reduced to 0 Pa, pressure drop Δ P equates with initial gas pressure P numerical value, by in P value substitution linear relation, calculate the cumulative volume Δ V of the corresponding all gas extracting, this volume deduction manifold volume is to the volume of testing container.
The beneficial effect that the present invention compared with prior art has is:
The present invention does not need the out-source gas such as helium or high-pressure air source, adopt the corresponding atmosphere existing in testing container as marked gas, by the pressure in testing container and pipeline in continuous recording pumping process and the gas buildup flow extracting, calculate the pressure drop in testing container and pipeline, adopt linear regression data processing method, set up the linear relationship of testing container and pipeline internal drop and extracting gases integrated flux, can calculate the volume of testing container.Pumping process does not need container inner pressure to be evacuated to higher vacuum, and whole process all remains in the working pressure range of accurate container restriction, can not damage material or associated components in testing container.The required calibration system of the method is simple in structure, operating process is easy, well solved out-of-shape, inner structure complexity, material special, can not filling liquid, volumetric calibration problem to nominal pressure term restriction space in all kinds of accurate hold-up vessel complexity of 80kPa ~ 120kPa.Suitably bleed under flow velocity prerequisite in selection, adopt the present invention can realize the Fast Calibration of spatial volume in accurate hold-up vessel complexity, measurement result and actual value deviation control are in ± 3.0%.
Brief description of the drawings
Fig. 1 is the schematic diagram of the volumetric calibration system of a kind of closed container of the present invention;
In figure: 1. testing container 2. valve I 3. joint I 4. flexible pipe I 5. joint II 6. tracheae 7. pressure transducer 8. flow sensor 9. valve II 10. joint III 11. flexible pipe II 12. pump 13. pressure display unit 14. flow indication controllers.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
Embodiment 1
As shown in Figure 1, this system comprises valve I 2, pressure transducer 7, flow sensor 8, valve II 9, vacuum pump 12, pressure display unit 13, flow indication controller 14 to the volumetric calibration system schematic of a kind of closed container of the present invention; Its annexation is, the gas outlet of testing container 1 is connected with one end of valve I 2, the other end of valve I 2 is connected with one end of flexible pipe I 4 by joint I 3, the other end of flexible pipe I 4 is connected with one end of joint II 5, the other end of joint II 5 is connected with pressure transducer 7, flow sensor 8, valve II 9 and joint III 10 successively by tracheae 6, and the other end of joint III 10 is connected with the air intake opening of vacuum pump 12 by flexible pipe II 11; Pressure transducer 7 is connected with pressure display unit 13 by signal wire; Flow sensor 8 is connected with flow indication controller 14 by signal wire.
The volumetric calibration method of a kind of closed container of the present invention, comprises the steps:
A) open valve I 2, makes the interior original pressure of testing container 1 and pipeline keep balance, is now designated as initial gas pressure P;
B) set by flow indication controller 14 flow velocity of bleeding, start the switch of vacuum pump 12, open valve II 9 starts extracting gases; Measure and extract the integrated flux of gas and the flow velocity of bleeding by flow sensor 8;
C), in pumping process, measure the gaseous tension in testing container 1 by pressure transducer 7; When pressure display unit 13 readings are low to moderate P 1when neighbouring, shut-off valve II 9, after pressure display unit 13 stable reading, records now pressure P rapidly 1accurate numerical value and cumulative flow value Δ V 1;
D) open valve II 9, continue extracting gases, repeat c) process several of above-mentioned steps, obtain testing container 1 internal pressure P in a series of pumping processes 1, P 2..., P nwith corresponding respectively cumulative flow value Δ V 1, Δ V 2..., Δ V n;
E) according to the testing container 1 internal pressure value P obtaining 1, P 2..., P n, calculate the voltage drop value Δ P in corresponding testing container 1 1, Δ P 2..., Δ P n, i.e. Δ P n=P-P n.Draw Δ P-Δ V figure, data are carried out to linear regression method matching, obtain relational expression ; Wherein, a, b are the coefficient of linear fit relational expression;
F) by relational expression in initial gas pressure P value substitution e) , can calculate Δ V value now, by this value deduction manifold volume V 2, calculate the volume V of testing container 1 1, i.e. V 1=Δ V-V 2; Wherein V 2for manifold volume, adopt pipeline diameter and length dimension to calculate.
Described pressure transducer 7 is that measurement range is the air absolute pressure transducer of 0.50kPa ~ 130.00kPa, is transmitted tested container 1 and is communicated with the pressure information in gas circuit to pressure display unit 13 by RS485 signal wire; Flow sensor 8 transmits the data of the integrated flux of bleed in gas circuit flow velocity and extracting gases to flow indication controller 14 by signal wire; The size of flow velocity of bleeding in gas circuit set and controlled by flow indication controller 14 by signal wire.
Pressure P in described step e) 1, P 2..., P nwithin the working pressure range that all should require at testing container 1; Integrated flux Δ V 1, Δ V 2..., Δ V nthe value of correspondence under local temperature and initial gas pressure P-condition while being mensuration.
The volumetric calibration system and method for a kind of closed container of the present invention is applicable to not contain the volumetric calibration of the container of volatile liquid.This be due to, in pumping process in testing container 1 in negative pressure state, if there is volatile substances in container, can affect the variation of system pressure, cause the deviation of measurement result.
Pressure P in the volumetric calibration method of a kind of closed container of the present invention 1, P 2..., P nwithin the working pressure range 80.0 ~ 120.0kPa that all should require at testing container 1; Integrated flux Δ V 1, Δ V 2..., Δ V nbe while mensuration local temperature and and initial gas pressure P-condition under corresponding value; Repeating step number of times e) is to be advisable for 5-12 time.
In the volumetric calibration method of a kind of closed container of the present invention, suppose that gas in container all finds time, now container inner pressure is reduced to 0 Pa, and pressure drop Δ P equates with initial gas pressure P numerical value, by P value substitution linear relation in, can calculate the cumulative volume Δ V of the corresponding all gas extracting, this Δ V value is exactly testing container 1 and manifold volume sum.By this value deduction manifold volume V 2, obtain the volume V of testing container 1 1, i.e. V 1=Δ V-V 2.Wherein, manifold volume V 2refer to from the endpiece of testing container 1 to the pipeline valve II 9, this volume adopts pipeline diameter and length dimension to calculate.

Claims (3)

1. the volumetric calibration system of a closed container, it is characterized in that, described system comprises valve I (2), pressure transducer (7), flow sensor (8), valve II (9), vacuum pump (12), pressure display unit (13), flow indication controller (14); Its annexation is, the gas outlet of testing container (1) is connected with one end of valve I (2), the other end of valve I (2) is connected with one end of flexible pipe I (4) by joint I (3), the other end of flexible pipe I (4) is connected with one end of joint II (5), the other end of joint II (5) is connected with pressure transducer (7), flow sensor (8), valve II (9) and joint III (10) successively by tracheae (6), and the other end of joint III (10) is connected with the air intake opening of vacuum pump (12) by flexible pipe II (11); Pressure transducer (7) is connected with pressure display unit (13) by signal wire; Flow sensor (8) is connected with flow indication controller (14) by signal wire.
2. a volumetric calibration method for closed container, is characterized in that comprising the steps:
A) open valve I (2), makes the interior original pressure of testing container (1) and pipeline keep balance, is now designated as initial gas pressure P;
B) set by flow indication controller (14) flow velocity of bleeding, start the switch of vacuum pump (12), open valve II (9) starts extracting gases; Measure and extract the integrated flux of gas and the flow velocity of bleeding by flow sensor (8);
C), in pumping process, measure the gaseous tension in testing container (1) by pressure transducer (7); When pressure display unit (13) reading is low to moderate P 1when neighbouring, shut-off valve II (9), after pressure display unit (13) stable reading, records now pressure P rapidly 1accurate numerical value and cumulative flow value Δ V 1;
D) open valve II (9), continue extracting gases, repeat c) process several of above-mentioned steps, obtain testing container in a series of pumping processes (1) internal pressure P 1, P 2..., P nwith corresponding respectively cumulative flow value Δ V 1, Δ V 2..., Δ V n;
E) according to testing container (1) the internal pressure value P obtaining 1, P 2..., P n, calculate the voltage drop value Δ P in corresponding testing container (1) 1, Δ P 2..., Δ P n, i.e. Δ P n=P-P n;
Draw Δ P-Δ V figure, data are carried out to linear regression method matching, obtain relational expression ; Wherein, a, b are the coefficient of linear fit relational expression;
F) by relational expression in initial gas pressure P value substitution e) , can calculate Δ V value now, by this value deduction manifold volume V 2, calculate the volume V of testing container (1) 1, i.e. V 1=Δ V-V 2; Wherein V 2for manifold volume, adopt pipeline diameter and length dimension to calculate.
3. according to the volumetric calibration method of a kind of closed container claimed in claim 2, it is characterized in that: described pressure transducer (7) is air absolute pressure transducer, transmit tested container (1) and be communicated with the pressure information in gas circuit to pressure display unit (13) by signal wire; Flow sensor (8) is the data to the integrated flux of bleed in flow indication controller (14) transmission gas circuit flow velocity and extracting gases by signal wire; The size of flow velocity of bleeding in gas circuit set and controlled by flow indication controller (14) by signal wire.
CN201410355271.9A 2014-07-24 2014-07-24 Calibration system and method for volume of closed container Pending CN104132707A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110319901A (en) * 2019-07-02 2019-10-11 东莞市美迪格电子科技有限公司 A kind of devices and methods therefor measuring nebulizer gas volume
CN112557130A (en) * 2021-02-28 2021-03-26 中国工程物理研究院核物理与化学研究所 Method for filling gas into gas detector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5485062A (en) * 1977-12-19 1979-07-06 Mitsubishi Electric Corp Method and apparatus of measuring volume
CN1779422A (en) * 2004-11-25 2006-05-31 博益(天津)气动技术研究所有限公司 Method for determining volume by charge and discharge process
CN102519538A (en) * 2011-12-20 2012-06-27 吴江市欣升测绘工程有限公司 Capacity measurer for closed fluid containers
CN102721516A (en) * 2012-06-20 2012-10-10 安徽中科智能高技术有限责任公司 Gas tightness detector and method for testing internal volume of container by aid of gas-release process
CN204085616U (en) * 2014-07-24 2015-01-07 中国工程物理研究院核物理与化学研究所 A kind of volumetric calibration system of closed container

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5485062A (en) * 1977-12-19 1979-07-06 Mitsubishi Electric Corp Method and apparatus of measuring volume
CN1779422A (en) * 2004-11-25 2006-05-31 博益(天津)气动技术研究所有限公司 Method for determining volume by charge and discharge process
CN102519538A (en) * 2011-12-20 2012-06-27 吴江市欣升测绘工程有限公司 Capacity measurer for closed fluid containers
CN102721516A (en) * 2012-06-20 2012-10-10 安徽中科智能高技术有限责任公司 Gas tightness detector and method for testing internal volume of container by aid of gas-release process
CN204085616U (en) * 2014-07-24 2015-01-07 中国工程物理研究院核物理与化学研究所 A kind of volumetric calibration system of closed container

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110319901A (en) * 2019-07-02 2019-10-11 东莞市美迪格电子科技有限公司 A kind of devices and methods therefor measuring nebulizer gas volume
CN112557130A (en) * 2021-02-28 2021-03-26 中国工程物理研究院核物理与化学研究所 Method for filling gas into gas detector

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