CN105651351A - Dropper type gas flow measuring device and method based on weighing principle - Google Patents
Dropper type gas flow measuring device and method based on weighing principle Download PDFInfo
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- CN105651351A CN105651351A CN201610186633.5A CN201610186633A CN105651351A CN 105651351 A CN105651351 A CN 105651351A CN 201610186633 A CN201610186633 A CN 201610186633A CN 105651351 A CN105651351 A CN 105651351A
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- dropper
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- electronic scale
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/704—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow using marked regions or existing inhomogeneities within the fluid stream, e.g. statistically occurring variations in a fluid parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The invention provides a dropper type gas flow measuring device and method based on a weighing principle. The dropper type gas flow measuring device comprises an electronic scale, an oil storage tank, a dropper, a dropper support, a gas inlet valve, a fine adjustment valve, a three-way tube and a computer, wherein the oil storage tank storing oil is arranged on the electronic scale, a lower-end dropper orifice of the dropper installed on the dropper support is located under the oil liquid level, an upper-end dropper orifice of the dropper is communicated with the gas inlet valve and the fine adjustment valve through the three-way tube, and the fine adjustment valve is communicated with a measured object. The electronic scale is connected with the computer, and weigh data and the time for the measuring process are recorded and stored through the computer. The dropper type gas flow measuring method comprises the steps that the gas inlet valve is turned on; the fine adjustment valve is adjusted to enable gas flow passing through the fine adjustment valve to meet the gas inlet requirements of the measured object; an initial weigh reading is recorded; the gas inlet valve is turned off; gas flow measurement continues, a plurality of continuous time points are recorded in real time, meanwhile weigh readings corresponding to the time points are recorded; when the computer judges that measurement is needed to stop, the gas inlet valve is turned on, and the measurement process is finished; outflow gas flow is calculated.
Description
Technical field
The invention belongs to instrument and meter and vacuum test technical field, particularly relate to a kind of burette type gas flow surveying instrument based on weighing principle and method.
Background technology
Vacuum pump has now been widely used in the industrial circles such as machinery, electronics, metallurgy, nuclear energy, spatial simulation and scientific and technical research, all plays an important role for the development of modern science and technology and the construction of national economy.
The speed of exhaust of vacuum pump is usually used as its model identification, the speed of exhaust also serves as the technical specification that vacuum pump is the most key, and the measurement of the speed of exhaust, also it is the project of must surveying as vacuum pump exfactory inspection and index determining, going back tailor for this has relevant national standard and international standard. Such as: " GB/T19955.1-2005 steam flow vacuum performance measurement method part 1: the measurement of volume flow rate (pumping speed) " and " GB/T19956.1-2005 displacement pump performance measurement method part 1: the measurement of volume flow rate (pumping speed) " etc. Above-mentioned national standard defines the speed of exhaust measuring method of vacuum pump, and disclose the speed of exhaust measurement ultimate principle of vacuum pump, its principle is: be connected with standard testing cover by the entrance of tested vacuum pump, then the gas flow Q flowing to standard testing cover is regulated, and make the gas pressure in standard testing cover reach stable equilibrium, again through accurately measuring gas flow Q and gas pressure p, calculate through formula S=Q/p and obtain the speed of exhaust S (volume flow rate) under gas pressure p.
Visible, only ensure that the accuracy of gas flow measurement, the accuracy of the guarantee speed of exhaust. but, in the speed of exhaust measurement process of vacuum pump (particularly high-vacuum pump), always inevitably run into the measurement problem of minute gas flow, now, vacuum sector application is vacuum burette type gas flow surveying instrument and method most often, in former machinery industry standard " JB/T8472.1-1996 property of vapor stream vacuum pump measures part 1: the mensuration of the speed of exhaust (volume flow) ", clearly recommend burette type gas flow surveying instrument, and give the structure composition of burette type gas flow surveying instrument in appendix, computing formula and dropper system of selection, and be equal in the new national standard of international standard no longer recommend measuring method in follow-up.
At present, vacuum industry also has employing mass-flow gas meter as measurement means, but, mass-flow gas meter belongs to indirect type relative measurement, certainty of measurement error cannot directly be estimated, and needs regularly to be demarcated by authoritative department detection, and this can give and use unit to bring very big inconvenience. Further, the measurement result data obtained by mass-flow gas meter can not be published as AUTHORITATIVE DATA, it is only used for internal reference. Therefore, vacuum industry is still got used to adopting traditional vacuum burette type gas flow surveying instrument and method.
For traditional vacuum burette type gas flow surveying instrument and method, actual application yet suffers from following weak point:
1. the link of operation manually is too much, and the measurement error of generation is bigger;
Measurement for each group of parameter, it is required for the liquid level in survey crew secondary visual observations dropper, and it is manually pressed by timer, even if survey crew through training and has good professional ability, manual operation link is still that the main source that measurement error produces.
In the Chinese patent that the patent No. is ZL200910012545.3, although proposing the mode adopting photoelectric liquid-level switch to replace artificial range estimation, judge that liquid level arrives the time of setting height whereby, but, it is subject to the restriction that liquid-level switch installation site should not regulate, during the Measuring Vacuum speed of exhaust at various pressures, it is difficult to ensure that measure interval just at high accuracy state, and when changing the dropper of different-diameter operating difficulties, and usually bring the new error of liquid-level switch setting height.
2. can only meter time interval time in average gas flow, it is impossible to the gas flow transient change in reflection during this period;
Calculated by measure equation, the simply gas average discharge in rereading interval, therefore, it is impossible to the gas flow transient change embodied in this time period. For above-mentioned reasons, before the speed of exhaust under each pressure spot of Measuring Vacuum, being required for maintaining the sufficiently long time to guarantee that the pressure in standard testing cover reaches stable equilibrium, the consequence caused is exactly measure efficiency low. And the gas flow change for causing because of gas pressure reduction in dropper, it is left in the basket only as original reason error.
There is original measurement error in the clear glass dropper 3. used;
First, the glass tubing internal diameter making dropper cannot pass through strict processing its dimensional uniformity of guarantee, only by portraying graduation mark to demarcate volume registration, causes that accuracy of reading is restricted. Secondly, when measuring minute gas flow, there is serious capillarity in the thin footpath dropper used, the lifting of liquid level is had very big drafts by this, cannot the error of quantitative estimation thus producing one.
Owing to traditional vacuum burette type gas flow surveying instrument and method exist above-mentioned deficiency, very big inconvenience is brought to vacuum industry, vacuum industry is in the urgent need to a kind of brand-new gas flow surveying instrument and method, it can measure gas flow convenient and swift and accurately and reliably, particularly measures minute gas flow.
Summary of the invention
For prior art Problems existing, the present invention provides a kind of burette type gas flow surveying instrument based on weighing principle and method, it measures function can strictly meet the regulation in former machinery industry standard (JB/T8472.1-1996) and new national standard and international standard (GB/T19955.1-2005/ISO/T8472.1-1996), can substitute for traditional vacuum burette type gas flow surveying instrument and method, and efficiently accomplish the measurement of the vacuum pump speed of exhaust (volume flow) performance parameter, and measurement for the minute gas flow in other industry is equally applicable.
To achieve these goals, the present invention adopts the following technical scheme that a kind of burette type gas flow surveying instrument based on weighing principle, including electronic scale, oil storage tank, dropper, burette bracket, intake valve, reset valve, tee T and computer, described oil storage tank is positioned on electronic scale, and in oil storage tank, storage has fluid; Described dropper is vertically installed on burette bracket, and the dropper lower end mouth of pipe is arranged in below oil storage tank fluid liquid level, and dropper body is contactless with oil storage tank; The described dropper upper end mouth of pipe is connected with first mouth of pipe of tee T, and second mouth of pipe of tee T is connected with the gas outlet of intake valve, the air inlet of intake valve and atmosphere; 3rd mouth of pipe of described tee T is connected with the air inlet of reset valve, and the gas outlet of reset valve is connected with the air inlet of measurand; The signal output part of described electronic scale is connected with computer, and weighing data electronic scale exported by computer carries out real time record and storage, and by computer, measurement process is carried out timing.
Described intake valve and reset valve adopt Non-follow control or automatically control, when employing automatically controls, the open and close of intake valve, reset valve Flow-rate adjustment of giving vent to anger be controlled each through computer.
Described oil storage tank in the vertical direction is iso-cross-section.
Described oil storage tank adopts light material to make.
Described dropper adopts non-transparent material manufacture, and dropper endoporus is iso-cross-section hole.
A kind of burette type gas flow measurement method based on weighing principle, have employed the described burette type gas flow surveying instrument based on weighing principle, comprises the steps:
Step one: control inlet open, the gas outlet of reset valve is connected with the air inlet of measurand simultaneously;
Step 2: reset valve is adjusted, makes the gas flow passed through in reset valve meet the air inlet requirement of measurand;
Step 3: by the reading of weighing this moment of electronic scale under computer recording, this reading of weighing is for reading of initially weighing;
Step 4: control intake valve and close, starts the continuous measurement of gas flow, and in measurement process, some continuous print time points under real time record, record the reading of weighing of the electronic scale corresponding to each time point simultaneously in a computer;
Step 5: when computer-made decision needs to stop measuring, control inlet open, terminate this measurement process;
Step 6: calculate the gas flow in timing time section in a computer, gas flow calculates formula and is:
In formula, q is the gas flow in timing time section, WiFor the reading of weighing of timing time section initial time electronic scale, Wi+nFor the reading of weighing of timing time section finish time electronic scale, paFor local atmospheric pressure, a is the endoporus cross-sectional area of dropper, and �� is fluid density, and g is local gravitational acceleration, and A is the difference of oil storage tank and the cross-sectional area of dropper body, V0For fluid liquid level initial in dropper to total measurement (volume) in the pipe at reset valve air inlet place, W0For the reading of initially weighing of electronic scale, tiFor timing time section initial time, ti+nFor timing time section finish time; Wherein, Wi��Wi+n��tiAnd ti+nIn i=1,2,3, n=1,2,3;
Step 7: when needs take multiple measurements, repeats step 2 to step 6.
The condition needing to stop is measured in computer-made decision following two:
1. when the air inlet of measurand has required;
2. when the height risen in dropper when fluid meets or exceeds the fluid of setting height allowable.
The height risen in dropper by computer-made decision fluid meets or exceeds the fluid height allowable of setting, and its judgment basis is following conditional:
W��W0-�� aL (1+a/A)
In formula, W is the reading of weighing in real time of electronic scale, W0For the reading of initially weighing of electronic scale, �� is fluid density, and a is the endoporus cross-sectional area of dropper, and L is fluid height allowable, and A is the difference of oil storage tank and the cross-sectional area of dropper body.
Beneficial effects of the present invention:
(1) present invention has possessed gas flow automatic measurement ability
" weighing principle " is introduced in burette type gas flow measurement by the present invention first, entirely without cargo handling operation manually, can effectively prevent the generation of measurement error in measurement process; When the present invention is applied to the vacuum pumping speed performance measurement of reality, pressure reading in the reading of weighing of electronic scale, the timing measuring process and standard testing cover, all directly can automatically be recorded by computer and store, thus make the present invention possess gas flow automatic measurement ability.
(2) present invention has possessed instantaneous delivery measurement capability
The timing operation of the present invention is completed by computer completely, compared with traditional artificial reading mode, achieves very big shortening on reading duration interval; Have again, can only measure for the average gas flow in the very long timing cycle time for traditional approach, and the present invention can measure the gas flow in extremely short interval time, and this gas flow can be sufficiently close to the reading duration point time instantaneous delivery, this makes to present invention may apply to the occasion that gas flow changes in time, thus expanding the use scope of the present invention; When the present invention is applied to vacuum pumping speed measurement, also can effectively relax the harsh conditions that in traditional approach, vacuum pumping speed must be reached near a certain pressure spot stable equilibrium, greatly shorten the measurement time; Compared with can only obtaining discrete type data with Traditional Man reading mode, the present invention can obtain continuous way data, and then can draw out pumping speed curve.
(3) present invention can adopt the dropper that non-transparent material manufactures
The present invention is by introducing " weighing principle ", effectively expand dropper and manufacture the scope of application of material, for the dropper that can only select clear glass material in traditional approach, owing to the present invention is without carrying out range estimation operation again, only need to can meet measurement needs by weighting manner, therefore, dropper can select steel manufacture, due to the material behavior that steel have, it possesses precision machined ability, can greatly improve the machining accuracy of dropper endoporus, by the steel dropper that Precision Machining mode manufactures, its hole size error to be far smaller than traditional clear glass dropper.
(4) present invention can effectively evade the capillary pressure phenomenon of slim pipe diameter dropper
Owing to the dropper of the present invention has high hole size precision, the endoporus cross-sectional area of dropper on certainty of measurement almost without impact, therefore, when carrying out Micro airflow measurement, without selecting the dropper of slim pipe diameter just can meet measurement needs, and then effectively evaded the capillary pressure phenomenon crossing slim pipe diameter dropper, thus avoid because capillary depresses the measurement error that phenomenon produces; Further, also need not often change the dropper in different size aperture in measuring because flow is different, therefore it is effectively simplified measurement procedure, is also effectively reduced hand labor intensity.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of a kind of burette type gas flow surveying instrument based on weighing principle of the present invention;
Fig. 2 is the structure principle chart of the vapor stream vacuum pump pumping speed performance automatic measurement system adopting the present invention to build in embodiment;
In figure, 1 electronic scale, 2 oil storage tanks, 3 droppers, 4 burette brackets, 5 intake valves, 6 reset valves, 7 tee Ts, 8 computers, 9 fluid, 10 vapor stream vacuum pumps, 11 standard testing covers, 12 prime mechanical pumps, 13 backing lines, 14 vacuum gauges.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of burette type gas flow surveying instrument based on weighing principle, including electronic scale 1, oil storage tank 2, dropper 3, burette bracket 4, intake valve 5, reset valve 6, tee T 7 and computer 8, described oil storage tank 2 is positioned on electronic scale 1, and in oil storage tank 2, storage has fluid 9; Described dropper 3 is vertically installed on burette bracket 4, and the dropper 3 lower end mouth of pipe is arranged in below oil storage tank 2 fluid 9 liquid level, and dropper 3 body is contactless with oil storage tank 2; The described dropper 3 upper end mouth of pipe is connected with first mouth of pipe of tee T 7, and second mouth of pipe of tee T 7 is connected with the gas outlet of intake valve 5, the air inlet of intake valve 5 and atmosphere; 3rd mouth of pipe of described tee T 7 is connected with the air inlet of reset valve 6, and the gas outlet of reset valve 6 is connected with the air inlet of measurand; The signal output part of described electronic scale 1 is connected with computer 8, by computer 8, the weighing data that electronic scale 1 exports is carried out real time record and storage, and by computer 8, measurement process is carried out timing.
Described intake valve 5 and reset valve 6 adopt Non-follow control or automatically control, when employing automatically controls, the open and close of intake valve 5, reset valve 6 Flow-rate adjustment of giving vent to anger be controlled each through computer 8.
Described oil storage tank 2 in the vertical direction is iso-cross-section.
In order to reduce total supporting power of electronic scale 1, described oil storage tank 2 adopts PVC plastic material to make.
In order to avoid clear glass dropper exists original measurement error, described dropper 3 adopts steel material manufacture, and dropper 3 endoporus is iso-cross-section hole.
A kind of burette type gas flow measurement method based on weighing principle, have employed the described burette type gas flow surveying instrument based on weighing principle, comprises the steps:
Step one: control intake valve 5 and open, the gas outlet of reset valve 6 is connected with the air inlet of measurand simultaneously;
Step 2: reset valve 6 is adjusted, makes the gas flow passed through in reset valve 6 meet the air inlet requirement of measurand;
Step 3: record electronic scale 1 reading of weighing this moment by computer 8, this reading of weighing is for reading of initially weighing;
Step 4: control intake valve 5 and close, starts the continuous measurement of gas flow, in measurement process, and some continuous print time points under real time record in computer 8, record the reading of weighing of electronic scale 1 corresponding to each time point simultaneously;
Step 5: when computer 8 judges to need to stop measuring, control intake valve 5 and open, terminate this measurement process; Wherein, computer 8 judges that measuring the condition needing to stop has following two:
1. when the air inlet of measurand has required;
2. when the height risen in dropper 3 when fluid 9 meets or exceeds the fluid of setting height allowable; Wherein, judging that the height that fluid 9 rises in dropper 3 meets or exceeds the fluid height allowable of setting by computer 8, its judgment basis is following conditional:
W��W0-��aL(1+a/A)
In formula, W is the reading of weighing in real time of electronic scale, W0For the reading of initially weighing of electronic scale, �� is fluid density, and a is the endoporus cross-sectional area of dropper, and L is fluid height allowable, and A is the difference of oil storage tank and the cross-sectional area of dropper body;
Step 6: calculate the gas flow in timing time section in computer 8, gas flow calculates formula and is:
In formula, q is the gas flow in timing time section, WiFor the reading of weighing of timing time section initial time electronic scale, Wi+nFor the reading of weighing of timing time section finish time electronic scale, paFor local atmospheric pressure, a is the endoporus cross-sectional area of dropper, and �� is fluid density, and g is local gravitational acceleration, and A is the difference of oil storage tank and the cross-sectional area of dropper body, V0For fluid liquid level initial in dropper to total measurement (volume) in the pipe at reset valve air inlet place, W0For the reading of initially weighing of electronic scale, tiFor timing time section initial time, ti+nFor timing time section finish time; Wherein, Wi��Wi+n��tiAnd ti+nIn i=1,2,3, n=1,2,3;
Step 7: when needs take multiple measurements, repeats step 2 to step 6.
Below the measurement apparatus adopting the present invention is built the embodiment of a vapor stream vacuum pump pumping speed performance automatic measurement system, before measuring system building, need the vapor stream vacuum pump 10 of setup test, standard testing cover 11, prime mechanical pump 12 and backing line 13, standard testing cover 11 is provided with vacuum gauge 14, and the determination of the structure of above-mentioned parts and parameter, perform fully according to the regulation in national standard " GB/T19955.1-2005 steam flow vacuum performance measurement method part 1: the measurement of volume flow rate (pumping speed) ". As in figure 2 it is shown, after vapor stream vacuum pump pumping speed performance automatic measurement system completes to build, measurement operation can be proceeded by.
Preparatory stage before measurement: be first according to operational method and step that national standard " GB/T19955.1-2005 steam flow vacuum performance measurement method part 1: the measurement of volume flow rate (pumping speed) " specifies, when reset valve 6 completely closes, start prime mechanical pump 12 and vapor stream vacuum pump 10 successively, make prime mechanical pump 12 and vapor stream vacuum pump 10 all reach steady-working state.
The pressure debugging stage before measurement: first determine and need to carry out vapor stream vacuum pump 10 inlet pressure range that pumping speed is measured, when intake valve 5 is opened, control reset valve 6 by computer 8 to open, make the test force value close to every bit from low to high of the gas balance pressure in standard testing cover 11, concrete operation step is: the inlet pressure that corresponding certain point sets, computer 8 reads the real balance force value in standard testing cover 11 by vacuum gauge 14, and compared with the inlet pressure level set, if real balance force value is higher than inlet pressure level, then computer 8 controls reset valve 6 and reduces its valve opening, the gas flow passed through in reset valve 6 is made to reduce, so that the real balance pressure in standard testing cover 11 reduces, whereas if real balance force value is lower than inlet pressure level, then computer 8 controls reset valve 6 and increases its valve opening, makes the gas flow passed through in reset valve 6 increase, so that the real balance pressure in standard testing cover 11 raises, so it is repeatedly performed, until the degree of closeness between real balance pressure and the inlet pressure of setting reaches License Value in standard testing cover 11, is finally completed gas flow and the adjustment operation of balance pressure.
Measuring phases: first pass through computer 8 and record electronic scale 1 reading of initially weighing this moment, close controlling intake valve 5 by computer 8, start the continuous measurement of gas flow, in measurement process, some continuous print time points under real time record in computer 8, record the reading of weighing of electronic scale 1 corresponding to each time point simultaneously, and record the pressure reading in the standard testing cover 11 that vacuum gauge 14 measures, when computer 8 judges to need to stop measuring, (Rule of judgment has two: the deviation between pressure reading and the inlet pressure of setting in the standard testing cover 11 that 1. vacuum gauge 14 measures is beyond License Value,2. when the height risen in dropper 3 when fluid 9 meets or exceeds the fluid of setting height allowable), control intake valve 5 and open, terminate this measurement process.
Result calculation stages: first pass through the gas flow q that computer 8 calculates automatically, in conjunction with the gas pressure p that vacuum gauge 14 measures, eventually passes formula S=q/p and can calculate the speed of exhaust S of vapor stream vacuum pump 10.
In the repeated measure stage, complete the gas flow measurement under the inlet pressure that left point sets, and calculate the speed of exhaust S of vapor stream vacuum pump 10 under the inlet pressure that left point sets.
Scheme in embodiment is also not used to the scope of patent protection of the restriction present invention, and all equivalences done without departing from the present invention are implemented or change, and are both contained in the scope of the claims of this case.
Claims (8)
1. the burette type gas flow surveying instrument based on weighing principle, it is characterized in that: include electronic scale, oil storage tank, dropper, burette bracket, intake valve, reset valve, tee T and computer, described oil storage tank is positioned on electronic scale, and in oil storage tank, storage has fluid; Described dropper is vertically installed on burette bracket, and the dropper lower end mouth of pipe is arranged in below oil storage tank fluid liquid level, and dropper body is contactless with oil storage tank; The described dropper upper end mouth of pipe is connected with first mouth of pipe of tee T, and second mouth of pipe of tee T is connected with the gas outlet of intake valve, the air inlet of intake valve and atmosphere; 3rd mouth of pipe of described tee T is connected with the air inlet of reset valve, and the gas outlet of reset valve is connected with the air inlet of measurand; The signal output part of described electronic scale is connected with computer, and weighing data electronic scale exported by computer carries out real time record and storage, and by computer, measurement process is carried out timing.
2. a kind of burette type gas flow surveying instrument based on weighing principle according to claim 1, it is characterized in that: described intake valve and reset valve adopt Non-follow control or automatically control, when employing automatically controls, the open and close of intake valve, reset valve Flow-rate adjustment of giving vent to anger be controlled each through computer.
3. a kind of burette type gas flow surveying instrument based on weighing principle according to claim 1, it is characterised in that: described oil storage tank in the vertical direction is iso-cross-section.
4. a kind of burette type gas flow surveying instrument based on weighing principle according to claim 1, it is characterised in that: described oil storage tank adopts light material to make.
5. a kind of burette type gas flow surveying instrument based on weighing principle according to claim 1, it is characterised in that: described dropper adopts non-transparent material manufacture, and dropper endoporus is iso-cross-section hole.
6., based on a burette type gas flow measurement method for weighing principle, have employed the burette type gas flow surveying instrument based on weighing principle described in claim 1, it is characterised in that comprise the steps:
Step one: control inlet open, the gas outlet of reset valve is connected with the air inlet of measurand simultaneously;
Step 2: reset valve is adjusted, makes the gas flow passed through in reset valve meet the air inlet requirement of measurand;
Step 3: by the reading of weighing this moment of electronic scale under computer recording, this reading of weighing is for reading of initially weighing;
Step 4: control intake valve and close, starts the continuous measurement of gas flow, and in measurement process, some continuous print time points under real time record, record the reading of weighing of the electronic scale corresponding to each time point simultaneously in a computer;
Step 5: when computer-made decision needs to stop measuring, control inlet open, terminate this measurement process;
Step 6: calculate the gas flow in timing time section in a computer, gas flow calculates formula and is:
In formula, q is the gas flow in timing time section, WiFor the reading of weighing of timing time section initial time electronic scale, Wi+nFor the reading of weighing of timing time section finish time electronic scale, paFor local atmospheric pressure, a is the endoporus cross-sectional area of dropper, and �� is fluid density, and g is local gravitational acceleration, and A is the difference of oil storage tank and the cross-sectional area of dropper body, V0For fluid liquid level initial in dropper to total measurement (volume) in the pipe at reset valve air inlet place, W0For the reading of initially weighing of electronic scale, tiFor timing time section initial time, ti+nFor timing time section finish time; Wherein, Wi��Wi+n��tiAnd ti+nIn i=1,2,3, n=1,2,3;
Step 7: when needs take multiple measurements, repeats step 2 to step 6.
7. the burette type gas flow measurement method based on weighing principle according to claim 6, it is characterised in that: the condition needing to stop is measured in computer-made decision following two:
1. when the air inlet of measurand has required;
2. when the height risen in dropper when fluid meets or exceeds the fluid of setting height allowable.
8. the burette type gas flow measurement method based on weighing principle according to claim 7, it is characterised in that: the height risen in dropper by computer-made decision fluid meets or exceeds the fluid height allowable of setting, and its judgment basis is following conditional:
W��W0-�� aL (1+a/A)
In formula, W is the reading of weighing in real time of electronic scale, W0For the reading of initially weighing of electronic scale, �� is fluid density, and a is the endoporus cross-sectional area of dropper, and L is fluid height allowable, and A is the difference of oil storage tank and the cross-sectional area of dropper body.
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| CN106125776A (en) * | 2016-07-05 | 2016-11-16 | 中国核动力研究设计院 | Devices and methods therefor steam flow being evaporated, measure and automatically controlling |
| CN106197591A (en) * | 2016-07-05 | 2016-12-07 | 中国核动力研究设计院 | Based on devices and methods therefor steam flow being evaporated, measure and regulating |
| CN107817035A (en) * | 2017-11-13 | 2018-03-20 | 安毅 | A kind of method of simple calibration mass air flow sensor |
| CN110346598A (en) * | 2019-06-19 | 2019-10-18 | 南京卡德威焊切器材有限公司 | Carbon arc gouging gun air-flow velocity test device and its test method |
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| CN106125776B (en) * | 2016-07-05 | 2018-10-30 | 中国核动力研究设计院 | The method that steam flow is evaporated, measure and is automatically controlled |
| CN106197591B (en) * | 2016-07-05 | 2018-11-23 | 中国核动力研究设计院 | Based on the method for being evaporated, measuring and adjusting to steam flow |
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