CN100434880C - Correcting apparatus enhancing volume measuring accuracy of small size bell jar and correcting method thereof - Google Patents
Correcting apparatus enhancing volume measuring accuracy of small size bell jar and correcting method thereof Download PDFInfo
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- CN100434880C CN100434880C CNB2006101458756A CN200610145875A CN100434880C CN 100434880 C CN100434880 C CN 100434880C CN B2006101458756 A CNB2006101458756 A CN B2006101458756A CN 200610145875 A CN200610145875 A CN 200610145875A CN 100434880 C CN100434880 C CN 100434880C
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Abstract
The invention relates to calibrating device used to increase mini-size bell jar volumetric measurement accuracy. It includes impounding container, four exhaust valves, eight glass cock valves, globe, electric-magnetic stop valve, silicone tube, tubule needle head type drainpipe, small caliber weighing cylinder. The glass pipeline is the main structure of the whole device. The calibrating method includes the following steps: connecting the pipeline as the calibrating device; complementing water and exhausting gas; adjusting their flow quantity; elevating the ball jar; finishing the calibrating by n is not less than 6 times. The invention realize super mini-size bell jar metering volume (minimum volume reaches 10ml) high accuracy calibrating, increase flow measurement accuracy of the micro gas flow calibrating device used super mini-size bell jar as main standard.
Description
Technical field
The present invention relates to the volume-calibrated device and the calibration steps thereof of the small gas flow calibrating device primary standard of a kind of bell-jar device, belong to measurement of gas flow technical field.
Background technology
The bell-jar gas flow calibrating device with bell jar as the primary standard device, its flow measurement principle is: movable uniform cross section cylindrical shape bell jar and fixing liquid bath constitute the sealed air-space of a variable volume, the bell jar outer wall is provided with several anti-dazzling screens of different spacing, in order to the mark metered volume, bell jar is in motion process, anti-dazzling screen successively triggers the optoelectronic switch that is fixed on the liquid bath and produces control signal, the control time set is finished the measurement that bell jar is discharged (or inflow) specific gas amount Δ V required time Δ t, calculates standard volume flow q by formula (1)
V:
In the formula, Δ V is exactly the volume of mark between two anti-dazzling screens, must accurately record by certain calibration means in advance, and its accuracy of measurement has directly determined the accuracy of measurement of flow, is the principal element that influences the flow measurement accuracy.
Calibration steps for the bell jar metered volume, in People's Republic of China's national metrological verification regulations " JJG 165-2005 bell-jar gas flow standard equipment ", introduction is arranged, comprise moving (quiet) attitude volume (quality) method and dimensional metrology, in these methods, the easiest assurance calibration accuracy surely belong to the dynamic mass method.As shown in Figure 1, the calibration steps of dynamic mass method is as follows: (1) is by the pipeline that connects shown in Figure 1: (2) open valve 3 ', 10 ' and 11 ' earlier, commutator is commutated to recirculatory pipe, then start water pump 8 ', valve-off 3 ', be full of water in the container to be sealed after; Valve-off 10 ', 11 ' and water pump 8 '; (3) Open valve 2 ' is raised to the extreme higher position with bell jar; Valve-off 2 ' is opened valve 12 ', and bell jar is linked to each other with the airtight container upper space; Treat that bell jar begins calibration after stable; (4) open valve 3 ', the water in the airtight container is gone in the pond through commutator and return line flow with suitable flow.This clock mask slowly descends, and when lower baffle plate triggered optoelectronic switch, optoelectronic switch sent signal and makes the commutator commutation, with current deflecting in standard.At this moment, bell jar continues to descend, and when overhead gage triggered the luminous point switch, photosignal made the commutator commutation once more, and water imports in the pond through recirculatory pipe again; (5) valve-off 3 ', weighing drainage water quality is so far finished primary calibration; (6) repeat the step of above-mentioned (1)～(5), until finishing the inferior calibration of n (n 〉=6).
In the above-mentioned calibration steps, the class of accuracy of bell jar characterizes with relative uncertainty form, for the large-size bell jar, because volume itself is bigger, the relative value of the uncertainty of measurement of bringing because of the calibration steps problem is less, so these methods and step are applicable to the calibration (being generally more than the 5L) of large-size bell jar metered volume.But along with reducing of bell jar size, even under the certain situation of device for mechanical performance, the numerical value of the relative uncertainty of volumetric measurement also can be big more, the immediate cause that produces this result is exactly the limitation of existing conventional calibration steps, thereby when calibration is used for the small size bell jar metered volume of small gas flow measurement, be difficult to the level of accuracy that reaches higher with traditional calibration steps, this also is that present existing small size bell jar class of accuracy is difficult to reach the main cause that is better than 1.0 grades of (U≤1.0% (k=2)) levels.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, a kind of calibrating installation and calibration steps that improves small size bell jar volume measuring accuracy is provided, realize the pin-point accuracy calibration of extra small size bell jar metered volume (minimum volume reaches 10mL), and then the flow measurement level of accuracy of the small gas flow calibrating device that to improve with extra small size bell jar be the primary standard device.
Technical solution of the present invention: the calibrating installation that improves small size bell jar volume measuring accuracy, glass piping is whole device main body structure, comprise: water storage container, be positioned at first stopcock in water storage container exit, the silicone tube that joins with first stopcock, one end, second stopcock that joins with the silicone tube other end, the other end of second stopcock is through the glass tube turning that makes progress, again through joining with the 3rd stopcock behind first vent valve, the output terminal of the 3rd stopcock is through tap three tunnel behind the glass tube, the first via is joined through glass tube and the 4th stopcock, the output that the 4th stopcock joins is connected to globe through glass tube, the second the tunnel through the glass tube turning that makes progress, behind second vent valve, join again with electromagnet cut off valve, electromagnet cut off valve joins through glass tube and the 5th stopcock again, the output of the 5th stopcock is connected to globe through glass tube, Third Road makes progress through glass tube and joins with the 6th stopcock behind the turning, the downward again turning of glass tube, again through connecing the 7th stopcock behind the 3rd vent valve, the 7th stopcock connects tubule needle-based drainpipe, bottom at tubule needle-based drainpipe is provided with small-bore weighing tank, be connected to the 4th vent valve and the 8th stopcock respectively at the two ends at air intake opening place, globe top, after wherein the 8th stopcock is connected to the bell jar variable valve through glass tube, be connected with bell jar.
Improve the calibration steps of small size bell jar volume measuring accuracy, step is as follows:
(1) preliminary work: after calibrating installation in accordance with claim connects pipeline, carry out pipeline moisturizing and exhaust, setting refill flow, set up drain discharge, promote bell jar, specific as follows:
A. pipeline moisturizing, exhaust: except that the 7th stopcock that leads to tubule needle-based drainpipe cut out, other stopcock and electromagnet cut off valve were all opened, and adopted the suction rainbow principle of water, and the water in the water storage container is injected in the globe; Carry out exhaust simultaneously, in glass piping, do not have to close all valves till the bubble;
B. set up refill flow: open first stopcock, second stopcock, the 3rd stopcock, the 4th stopcock, the 8th stopcock and bell jar variable valve successively, close other valves, regulate the 3rd stopcock, the control refill flow, observe bell jar and promote situation, guarantee bell jar in demarcating section the moisturizing time no longer than 1min, should guarantee that simultaneously liquid level is as far as possible near spheroid top air intake opening in the globe, close first stopcock, second stopcock, the 4th stopcock, and liquid level position in mark globe this moment;
C. set up drain discharge: open the 5th stopcock, the 6th stopcock, the 7th stopcock and electromagnet cut off valve successively, regulate the Control Flow of the 7th stopcock, observe bell jar decline situation simultaneously, guarantee bell jar in demarcating section working time no longer than 6min, flow is closed the 6th stopcock and electromagnet cut off valve after setting up;
D. promote bell jar: open first stopcock, second stopcock, the 4th stopcock successively, after liquid level rises to the position of step (b) mark in the globe, close first stopcock, second stopcock, the 4th stopcock successively;
(2) begin calibration
Open the 6th stopcock and electromagnet cut off valve, water is flowed in the cut-and-dried complementary tank through tubule needle-based drainpipe, bell jar drops to when demarcating the section lower contact, photosignal control electromagnet cut off valve by the outside is closed, remove complementary tank, change the small-bore weighing tank that removes tare weight, open electromagnet cut off valve once more, water flows in the small-bore weighing tank, bell jar drops to when demarcating the section upper contact, photosignal is controlled electromagnet cut off valve once more and is closed, with small-bore weighing tank be placed on claim on the electronic balance the apparent mass of drainage water, so far finish a test job; Repeat above-mentioned (1) and (2) step is carried out recalibration,, finish whole calibration operations until n 〉=6 time.
Invention advantage compared with prior art is:
(1) the water pump moisturizing scheme of prior art has been abandoned in the present invention's pick, utilize the siphon principle of water, adopt before each calibration all will be again from the bottom to the scheme of spherical container moisturizing, avoided to the full extent in the existing apparatus owing to very easily produce bubble, and reduced the shortcoming of calibration accuracy.
(2) the present invention adopts moisturizing to promote the bell jar scheme, and fixedly moisturizing liquid level and moisturizing speed, at first avoided the inconsistency of the unevenness of the bell jar pulling speed that manually-operated brings and pulling speed, raised position, helped improving the stability of bell jar motion state and improve volume-calibrated repeatability; In addition, in the recalibration process, avoided in the conventional calibration steps, soft air and external environment dry air frequent exchange phenomenon have been eliminated the influence of liquid evaporation effect to calibration result in the bell jar, help improving the volume-calibrated accuracy;
(3) the present invention is equipped with a plurality of glass cock valves and vent valve, by it is carried out the adjusting of switching manipulation and aperture size, can control the flow direction and the flow velocity of different segmentation liquid and bubble easily, remedy being not easy to the segmentation exhaust and controlling deficiencies such as moisturizing, drainage speed of existing in existing apparatus or the method, improved calibration repeatability and stable.
(4) the draining pipeline section at water delivering orifice of the present invention place adopts the tubule needle head structure, under the surface tension effects of water,, can guarantee to be in all the time in the whole pipeline water full state no matter whether water flows, overcome existing apparatus in the defective aspect this, further guaranteed calibration repeatability.
(5) weighing tank of the present invention adopts small-bore weighing tank structure, has reduced by weighing evaporation of water speed, thereby has made it the influence of weighing accuracy is decreased to negligible degree.
(6) replace commutator of the prior art with electromagnet cut off valve, adopting initial sum to stop two photoelectric switching signals is that electromagnet cut off valve closes the valve controlling schemes, the calibration error that commutator open and close speed inconsistency is brought when having eliminated conventional dynamic calibration.
(7) adopt the transparent material of being convenient to observe, hard junction is glass tube and glass container, and the place that is flexible coupling is silicone tube.
(8) flow measurement of the inventive method as a result the uncertainty evaluation result be U≤0.33% (k=2), class of accuracy has reached 0.5 grade.
Description of drawings
Fig. 1 is a conventional dynamic mass method bell jar capacity calibrating principle synoptic diagram;
Fig. 2 is a calibrating installation structural representation of the present invention.
Embodiment
As shown in Figure 2, the present invention is mainly by water storage container 19,4 vent valves 3,11,13,21,8 glass cock valves 4,5,6,12,14,15,20,22, globe 18, electromagnet cut off valve 7, silicone tube 16, tubule needle-based drainpipe 8 and small-bore weighing tank 9 are formed, and glass piping is whole device main body structure.During water filling, adopt the suction rainbow principle of water, control with first stopcock 20 of the water in the water storage container 19 by being positioned at its exit, pass through successively downwards and first stopcock 20 with the flow of setting, silicone tube 16, second stopcock 14 that joins with silicone tube 16, make progress through glass tube and to connect the 3rd stopcock 12 behind the turning, behind the 3rd stopcock 12, divide three the tunnel again, two-way is wherein arranged respectively upwards through the 4th stopcock 15 and electromagnet cut off valve 7, inject globe 18 simultaneously behind the 5th stopcock 6, the glass tube that another route connects makes progress behind the turning, through the 6th stopcock 5, the 7th stopcock 4 and tubule needle-based drainpipe 8, guaranteeing that water is full of the entire body glass piping, be connected to first vent valve 13 of the exhaust that is used to discharge water in the corner of glass piping, second vent valve 11 and the 3rd vent valve 3; During draining, the water in the globe 18 is successively through the 5th stopcock 6, and electromagnet cut off valve 7, the six stopcocks 5 and the 7th stopcock 4 enter in the osculum weighing tank 9 through tubule needle-based drainpipe 8 again.
Be connected to the 4th vent valve 21 and the 8th stopcock 22 respectively at two ends, globe 18 top exit place, wherein be connected to bell jar 1 behind the 8th stopcock 22 process glass tubes and the variable valve 2, the effect of the 4th vent valve 21 mainly is exhaust, and the effect of the 8th stopcock 22 is that anti-sealing flows backwards to bell jar 1.
Electromagnet cut off valve 7 effects among Fig. 2 are the control that realizes the necessary water filling of calibration, exhaust, draining and calibration process, are indispensable hardware carriers in the whole calibrating installation, and the pass valve control of electromagnet cut off valve 7 realizes by external photosignal.
Turning between second stopcock 14 and the 3rd stopcock 12, or the turning between electromagnet cut off valve 7 and the 6th stopcock 5, or the turning between the 6th stopcock 5 and the 7th stopcock 4 is all less than 90 degree.The diameter of the small-bore weighing tank 9 among the present invention is less than 10mm, and all stopcocks are the glass cock valve.
As shown in Figure 2, calibration steps of the present invention is as follows:
(1) preliminary work:
After connecting pipeline according to above-mentioned calibrating installation, carry out pipeline moisturizing and exhaust, setting refill flow, set up drain discharge, promote the step of bell jar 1:
A. pipeline moisturizing, exhaust: except that the stopcock that leads to tubule needle-based drainpipe 8 cut out, other stopcock and electromagnet cut off valve 7 were all laid, and adopted the suction rainbow principle of water, and the water in the water storage container 19 is injected in the globe 18; Carry out the segmentation exhaust simultaneously, in glass piping, do not have to close all valves till the bubble, stop moisturizing, exhaust;
B. set up refill flow: open first stopcock 20 successively, second stopcock 14, the 3rd stopcock 12, the 4th stopcock 15, the 8th cock 22 and bell jar variable valve 2, close other valves, regulate the 3rd stopcock 12, the control refill flow, observe bell jar 1 lifting situation simultaneously, speed is too not fast, operate steadily and be as the criterion with range estimation bell jar 1, and guarantee bell jar 1 in demarcating section the moisturizing time no longer than 1min, under this flow, promote bell jar 1 to corresponding height according to selected demarcation section, generally make selected demarcation section lower contact position exceed the optoelectronic switch distance and be not less than 20mm, should guarantee that simultaneously liquid level is closed first stopcock 20 as far as possible near spheroid top air intake opening in the globe 18, second stopcock 14, the 4th stopcock 15, and liquid level position in the mark globe 18 this moment;
C. set up drain discharge: open the 5th stopcock 6, the 6th stopcock 5, the 7th stopcock 4 and electromagnet cut off valve 7 successively, regulate the 7th stopcock 4 Control Flow, observe bell jar 1 decline situation simultaneously, flow is not too big, and operating steadily with range estimation bell jar 1 is as the criterion, and guarantee bell jar 1 in demarcating section working time no longer than 6min, flow is closed the 6th stopcock 5 and electromagnet cut off valve 7 after setting up, and stops draining, bell jar 1 stops to descend, and has so just finished the setting of drain discharge;
D. promote bell jar: open first stopcock 20, second stopcock 14, the 4th stopcock 15 successively, after liquid level rises to the position of step (b) mark in the globe 18, close first stopcock 20, second stopcock 14, the 4th stopcock 15 successively, stop to promote bell jar 1.
(2) begin calibration
Open the 6th stopcock 5 and electromagnet cut off valve 7, water flows in the complementary tank, when bell jar 1 drops to the calibration segment lower contact, photosignal control electromagnet cut off valve 7 is closed, remove complementary tank, change the small-bore weighing tank 9 that removes tare weight (note this time interval should as far as possible lack), photosignal is controlled electromagnet cut off valve 7 once more and is opened, water flows in the small-bore weighing tank 9, bell jar 1 drops to when demarcating the section upper contact, photosignal is controlled electromagnet cut off valve 7 once more and is closed, with small-bore weighing tank 9 be placed on claim on the electronic balance 10 the apparent mass of drainage water, through the buoyancy correction, calculate the drainage water volume by water-mass density again, this so far finishes a test job promptly by the volume of school bell jar; Repeat above-mentioned (1) and (2) step is carried out recalibration,, finish whole calibration operations until n 〉=6 time; The mean value of getting n 〉=6 time at last is calibration value.
Claims (7)
1, a kind of calibrating installation that improves small size bell jar volume measuring accuracy, it is characterized in that: glass piping is whole device main body structure, comprise: water storage container (19), be positioned at first stopcock (20) in water storage container (19) exit, the silicone tube (16) that joins with first stopcock (20) one ends, second stopcock (14) that joins with silicone tube (16) other end, the other end of second stopcock (14) is through the glass tube turning that makes progress, join with the 3rd stopcock (12) through first vent valve (13) back again, the output terminal of the 3rd stopcock (12) is through tap three tunnel behind the glass tube, the first via is joined through glass tube and the 4th stopcock (15), the output that the 4th stopcock (15) joins is connected to globe (18) through glass tube, the second the tunnel through the glass tube turning that makes progress, behind second vent valve (11), join again with electromagnet cut off valve (7), electromagnet cut off valve (7) passes through glass tube again and the 5th stopcock (6) joins, the output of the 5th stopcock (6) is connected to globe (18) through glass tube, Third Road makes progress through glass tube and joins with the 6th stopcock (5) behind the turning, the upwards downward again turning of glass tube, again through connecing the 7th stopcock (4) behind the 3rd vent valve (3), the 7th stopcock (4) connects tubule needle-based drainpipe (8), be provided with small-bore weighing tank (9) in the bottom of tubule needle-based drainpipe (8), be connected to the 4th vent valve (21) and the 8th stopcock (22) respectively at the two ends at air intake opening place, globe (18) top, after wherein the 8th stopcock (22) is connected to bell jar variable valve (2) through glass tube, be connected with bell jar (1).
2, the calibrating installation of raising small size bell jar volume measuring accuracy according to claim 1, it is characterized in that: the turning between described second stopcock (14) and the 3rd stopcock (12), or the turning between electromagnet cut off valve (7) and the 6th stopcock (5), or the turning between the 6th stopcock (5) and the 7th stopcock (4) is all less than 90 degree.
3, the calibrating installation of raising small size bell jar volume measuring accuracy according to claim 1, it is characterized in that: the diameter of described small-bore weighing tank (9) is less than 10mm.
4, the calibrating installation of raising small size bell jar volume measuring accuracy according to claim 1 is characterized in that: the pass valve control of described electromagnet cut off valve (7) realizes by external photosignal.
5, the calibrating installation of raising small size bell jar volume measuring accuracy according to claim 1, it is characterized in that: described stopcock is the glass cock valve.
6, improve the calibration steps of small size bell jar volume measuring accuracy, it is characterized in that step is as follows:
(1) preliminary work: after connecting pipeline according to the described calibrating installation of claim 1-5, carry out pipeline moisturizing and exhaust, setting refill flow, set up drain discharge, promote bell jar, specific as follows:
A. pipeline moisturizing, exhaust: except that the 7th stopcock (4) that leads to tubule needle-based drainpipe (8) cuts out, other stopcock and electromagnet cut off valve (7) are all opened, adopt the suction rainbow principle of water, the water in the water storage container (19) is injected in the globe (18); Simultaneously glass piping is carried out exhaust, in glass piping, do not have till the bubble, close all valves;
B. set up refill flow: open first stopcock (20) successively, second stopcock (14), the 3rd stopcock (12), the 4th stopcock (15), the 8th stopcock (22) and bell jar variable valve (2), close other valves, regulate the 3rd stopcock (12), the control refill flow, observe the lifting situation of bell jar (1), guarantee bell jar (1) in demarcating section the moisturizing time no longer than 1min, should guarantee that simultaneously the interior liquid level of globe (18) is as far as possible near spheroid top air intake opening, close first stopcock (20), second stopcock (14), the 4th stopcock (15), and the interior liquid level position of mark globe (18) this moment;
C. set up drain discharge: open the 5th stopcock (6), the 6th stopcock (5), the 7th stopcock (4) and electromagnet cut off valve (7) successively, regulate the Control Flow of the 7th stopcock (4), observe bell jar (1) decline situation simultaneously, guarantee bell jar (1) in demarcating section working time no longer than 6min, flow is closed the 6th stopcock (5) and electromagnet cut off valve (7) after setting up;
D. promote bell jar: open first stopcock (20), second stopcock (14), the 4th stopcock (15) successively, after the interior liquid level of globe (18) rises to the position of step (b) mark, close first stopcock (20), second stopcock (14), the 4th stopcock (15) successively;
(2) begin calibration
Open the 6th stopcock (5) and electromagnet cut off valve (7), water is flowed in the cut-and-dried complementary tank through tubule needle-based drainpipe, when bell jar (1) drops to the calibration segment lower contact, control electromagnet cut off valve (7) is closed, remove complementary tank, change the small-bore weighing tank (9) that removes tare weight, open electromagnet cut off valve (7) once more, water flows in the small-bore weighing tank (9), bell jar (1) drops to when demarcating the section upper contact, control electromagnet cut off valve (7) is closed, with small-bore weighing tank (9) be placed on claim on the electronic balance the apparent mass of drainage water, so far finish a test job; Recalibration is carried out in above-mentioned (1) and (2) step,, finish whole calibration operations until n 〉=6 time.
7, the calibration steps of raising small size bell jar volume measuring accuracy according to claim 6 is characterized in that: the pass valve of described electromagnet cut off valve (7) adopts initial sum to stop two photoelectric switching signals and controls.
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| CNB2006101458756A CN100434880C (en) | 2006-11-21 | 2006-11-21 | Correcting apparatus enhancing volume measuring accuracy of small size bell jar and correcting method thereof |
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| CNB2006101458756A CN100434880C (en) | 2006-11-21 | 2006-11-21 | Correcting apparatus enhancing volume measuring accuracy of small size bell jar and correcting method thereof |
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| CN100434880C true CN100434880C (en) | 2008-11-19 |
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| CN105203188B (en) * | 2014-06-04 | 2021-07-13 | 中国石油化工股份有限公司 | Oil-water interface detector and oil tank level gauge calibrating device |
| CN104089685B (en) * | 2014-07-14 | 2017-03-08 | 湖南威铭能源科技有限公司 | Improve the conforming method of transit time ultrasonic ripple heat quantity flow measurement error |
| CN107957291B (en) * | 2016-10-14 | 2020-04-03 | 株式会社龙野 | Calibration device |
| CN108489576A (en) * | 2018-07-09 | 2018-09-04 | 中国计量大学 | A kind of calibrating installation and calibration method of small volumetric(al) standards device |
| CN114002108A (en) * | 2020-07-28 | 2022-02-01 | 广州中广测计量检测技术有限公司 | A calibration method and device for a water outgassing tester |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1540298A (en) * | 2003-04-21 | 2004-10-27 | 上海威尔泰工业自动化股份有限公司 | Method for calibrating dynamic volumel |
| CN1603991A (en) * | 2003-09-30 | 2005-04-06 | 艾格瑞系统有限公司 | Bypass loop gas flow calibration |
| CN2771836Y (en) * | 2004-12-01 | 2006-04-12 | 中国石油天然气股份有限公司 | Intelligent bell jar calibrating device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540298A (en) * | 2003-04-21 | 2004-10-27 | 上海威尔泰工业自动化股份有限公司 | Method for calibrating dynamic volumel |
| CN1603991A (en) * | 2003-09-30 | 2005-04-06 | 艾格瑞系统有限公司 | Bypass loop gas flow calibration |
| CN2771836Y (en) * | 2004-12-01 | 2006-04-12 | 中国石油天然气股份有限公司 | Intelligent bell jar calibrating device |
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