CN105651351B - A kind of burette type gas flow surveying instrument and method based on weighing principle - Google Patents
A kind of burette type gas flow surveying instrument and method based on weighing principle Download PDFInfo
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- CN105651351B CN105651351B CN201610186633.5A CN201610186633A CN105651351B CN 105651351 B CN105651351 B CN 105651351B CN 201610186633 A CN201610186633 A CN 201610186633A CN 105651351 B CN105651351 B CN 105651351B
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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
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Volume Flow (AREA)
Abstract
A kind of burette type gas flow surveying instrument and method based on weighing principle, device includes electronic scale, oil storage tank, dropper, burette bracket, intake valve, reset valve, three-way pipe and computer, the oil storage tank for being stored with fluid is placed on electronic scale, dropper lower end nozzle on burette bracket is located at below fluid liquid level, upper end tube nozzle is connected to by three-way pipe with intake valve and reset valve, and reset valve is connected to measurand；Electronic scale is connected with computer, and weighing data is recorded and stored by computer and carries out timing to measurement process.Method and step is：Open intake valve；Adjust reset valve make in it by gas flow meet measurand air inlet requirement；Record initial reading of weighing；Close intake valve；Start gas flow continuously to measure, records several continuous time points in real time, while recording the reading of weighing corresponding to Each point in time；When computer-made decision needs to stop measuring, intake valve is opened, terminates measurement process；Calculate gas flow.
Description
Technical field
The invention belongs to instrument and meters and vacuum test technical field, more particularly to a kind of dropper based on weighing principle
Formula gas flow surveying instrument and method.
Background technology
Vacuum pump has been widely used in the industrial circles such as machinery, electronics, metallurgy, nuclear energy, spatial simulation and science and technology
In research, the construction of development and national economy for modern science and technology all plays an important role.
The speed of exhaust of vacuum pump is usually as its model identification, the speed of exhaust also technology the most key as vacuum pump
Index, and the measurement of the speed of exhaust, and project must be surveyed as vacuum pump exfactory inspection and index determining, thus also special system
Surely there are relevant national standard and international standard.Such as：《GB/T19955.1-2005 steam stream vacuum performances measurement method the 1st
Part：The measurement of volume flow rate (pumping speed)》And《GB/T19956.1-2005 displacement pump performance measurement method part 1s：Body
The measurement of product flow rate (pumping speed)》Deng.The speed of exhaust measurement method of vacuum pump is defined in above-mentioned national standard, and is disclosed
The speed of exhaust of vacuum pump measures basic principle, and principle is：The entrance of tested vacuum pump is connected with standard testing cover, then
The gas flow Q for flowing to standard testing cover is adjusted, and the gas pressure in standard testing cover is made to reach stable equilibrium, then passes through essence
Gas flow Q and gas pressure p are really measured, the speed of exhaust S (bodies at gas pressure p are calculated by formula S=Q/p
Product flow rate).
As it can be seen that only ensure that the accuracy of gas flow measurement, the accuracy of the speed of exhaust just can guarantee.But
In the speed of exhaust measurement process of vacuum pump (especially high-vacuum pump), the survey of minute gas flow is always inevitably encountered
Amount problem, at this point, vacuum sector application most often vacuum burette type gas flow surveying instrument and method, in original machine tool
Professional standard《JB/T8472.1-1996 property of vapor stream vacuum pump measures part 1：The measurement of the speed of exhaust (volume flow)》
In, burette type gas flow surveying instrument is clearly recommended, and give burette type gas flow surveying instrument in appendix
Structure composition, calculation formula and dropper selection method, and no longer recommended in the subsequent new national standard for being equal to international standard
Measurement method.
Currently, vacuum industry also uses gas mass flow to be counted as measurement means, and still, gas mass flow gauge category
In indirect type relative measurement, measurement accuracy error can not be estimated directly, and need periodically to be detected by authoritative department and demarcate, this can give
Very big inconvenience is brought using unit.Further more, the measurement result obtained by gas mass flow gauge can not be used as authority
Data are published, and internal reference is only used for.Therefore, vacuum industry is still got used to using traditional vacuum burette type gas
Body flow measurement device and method.
For traditional vacuum burette type gas flow surveying instrument and method, in actual application still have with
Lower shortcoming：
1. manually the link of operation is excessive, the measurement error of generation is larger；
Measurement for each group of parameter, the liquid level being required in the secondary visual observations dropper of survey crew, and hand
Dynamic to press timer, even if survey crew is by training and has good professional ability, manual operation link is still measurement
The main source that error generates.
In the Chinese patent of Patent No. ZL200910012545.3, replaced using photoelectric liquid-level switch although proposing
The mode manually estimated, whereby come judge liquid level reach setting height time, it is still, unsuitable by liquid-level switch installation site
The limitation of adjusting, when the Measuring Vacuum speed of exhaust at various pressures, it is difficult to ensure that time of measuring interval is just at height
Precision state, and the operating difficulties when replacing the dropper of different-diameter, and usually bring the new mistake of liquid-level switch setting height
Difference.
2. the average gas flow in the timing cycle time can only be measured, it cannot reflect that the gas flow in this period is instantaneous
Variation；
It is calculated by measure equation, only the gas average flow rate in rereading time interval, therefore, it is impossible to
Embody the gas flow transient change in the period.Pumping under each pressure spot of Measuring Vacuum due to the above reasons,
Before rate, it is required for maintaining the sufficiently long time to ensure that the pressure in standard testing cover reaches stable equilibrium, caused consequence
It is exactly the low of measurement efficiency.And the gas flow caused by gas pressure reduces in dropper is changed, principle can only be used as
Property error is ignored.
3. there are original measurement errors for used transparent glass dropper；
First, its dimensional uniformity can not be ensured by strictly processing by making the glass bore of dropper, can only pass through quarter
Graduation mark is drawn to demarcate volume registration, accuracy of reading is caused to be restricted.Secondly, it when measuring minute gas flow, is used
Thin footpath dropper there are serious capillary phenomenon, this has prodigious drafts to the promotion of liquid level, can not to generate one
The error of quantitative estimation.
Since there are above-mentioned deficiencies for traditional vacuum burette type gas flow surveying instrument and method, brought to vacuum industry
Big inconvenience, vacuum industry, can be convenient and efficient there is an urgent need to a kind of completely new gas flow surveying instrument and method
And gas flow is accurately and reliably measured, especially measure minute gas flow.
Invention content
In view of the problems of the existing technology, the present invention provides a kind of burette type gas flow measurement based on weighing principle
Device and method, former machinery industry standard (JB/T8472.1-1996) and new national standard and state can strictly be met by measuring function
Regulation in border standard (GB/T19955.1-2005/ISO/T8472.1-1996) can replace traditional vacuum burette type gas
Body flow measurement device and method, and the measurement of the vacuum pump speed of exhaust (volume flow) performance parameter is efficiently accomplished, and for
The measurement of minute gas flow in other industry is equally applicable.
To achieve the goals above, the present invention adopts the following technical scheme that：A kind of burette type gas based on weighing principle
Flow measurement device, including electronic scale, oil storage tank, dropper, burette bracket, intake valve, reset valve, three-way pipe and computer, institute
It states oil storage tank to be positioned on electronic scale, fluid is stored in oil storage tank；The dropper is vertically installed on burette bracket, dropper
Lower end nozzle is located in oil storage tank below fluid liquid level, and dropper tube body and oil storage tank are contactless；The dropper upper end tube nozzle with
First nozzle of three-way pipe is connected, and the second nozzle of three-way pipe is connected with the gas outlet of intake valve, the air inlet of intake valve
It is communicated with air；The third nozzle of the three-way pipe is connected with the air inlet of reset valve, the gas outlet of reset valve with tested pair
The air inlet of elephant is connected；The signal output end of the electronic scale is connected with computer, is exported to electronic scale by computer
Weighing data record and store in real time, and carries out timing to measurement process by computer.
The intake valve and reset valve are using manually controlling or automatically controlling, and when using automatically controlling, intake valve is opened
It opens and closes, the outlet flow-rate adjustment of reset valve is controlled by computer.
The oil storage tank is iso-cross-section in the vertical direction.
The oil storage tank is made of light material.
The dropper is manufactured using non-transparent material, and dropper endoporus is iso-cross-section hole.
A kind of burette type gas flow measurement method based on weighing principle uses the drop based on weighing principle
Tubular gas flow measurement device, includes the following steps：
Step 1：Inlet open is controlled, while the gas outlet of reset valve being connected with the air inlet of measurand；
Step 2：Reset valve is adjusted, make in reset valve by gas flow meet the air inlet of measurand and want
It asks；
Step 3：The reading of weighing of electronic scale this moment is recorded by computer, the reading of weighing is initial reading of weighing；
Step 4：It controls intake valve to close, starts the continuous measurement of gas flow, it is real in a computer in measurement process
When record several continuous time points, while recording the reading of weighing of the electronic scale corresponding to Each point in time；
Step 5：When computer-made decision needs to stop measuring, inlet open is controlled, this measurement process is terminated；
Step 6：The gas flow in timing time section is calculated in a computer, and 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
Number, Wi+nFor the reading of weighing of timing time section finish time electronic scale, paFor local atmospheric pressure, a is that the endoporus of dropper is transversal
Area, ρ are fluid density, and g is local gravitational acceleration, and A is the difference of the cross-sectional area of oil storage tank and dropper tube body, V0For dropper
Total measurement (volume) in pipe at interior initial fluid liquid level to reset valve air inlet, W0For the initial reading of weighing of electronic scale, tiFor timing when
Between 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 needing to take multiple measurements, step 2 is repeated to step 6.
Computer-made decision, which measures, needs the condition stopped having following two：
1. when the air inlet of measurand requires to complete；
2. when the height that fluid rises in dropper meets or exceeds the fluid height allowable of setting.
The height risen in dropper by computer-made decision fluid meets or exceeds the fluid height allowable of setting, sentences
Fixed foundation is following conditional：
W≤W0- ρ aL (1+a/A)
In formula, W is the reading of weighing in real time of electronic scale, W0For the initial reading of weighing of electronic scale, ρ is fluid density, and a is
The endoporus cross-sectional area of dropper, L are fluid height allowable, and A is the difference of the cross-sectional area of oil storage tank and dropper tube body.
Beneficial effects of the present invention：
(1) present invention has gas flow automatic measurement ability
" weighing principle " is introduced into burette type gas flow measurement by the present invention for the first time, can not had completely in measurement process
Manually cargo handling operation effectively prevents the generation of measurement error；When the present invention is applied to actual vacuum pumping speed performance
When measurement, the pressure reading in the reading of weighing of electronic scale, the timing of measurement process and standard testing cover can be directly by calculating
Machine is automatically recorded and is stored, thus the present invention is made to have gas flow automatic measurement ability.
(2) present invention has instantaneous flow measurement capability
The timing operation of the present invention is completed by computer completely, compared with traditional artificial reading mode, in the reading duration
Very big shortening is realized on interval；Further more, the average gas stream in the very long timing cycle time can only be measured for traditional approach
For amount, and the present invention can measure the gas flow in extremely short interval time, and the gas flow can be sufficiently close to read
Instantaneous flow when number time point, this makes present invention may apply to the occasion that gas flow changes at any time, to expand
The big use scope of the present invention；When the present invention, which is applied to vacuum pumping speed, to be measured, it is right in traditional approach can also effectively to relax
Vacuum pumping speed must reach the harsh conditions of stable equilibrium near a certain pressure spot, greatly shorten time of measuring；With biography
Artificial reading mode of uniting can only obtain discrete type data and compare, and the present invention can obtain continous way data, and then can draw out
Pumping speed curve.
(3) dropper of non-transparent material manufacture may be used in the present invention
The present invention effectively expands the scope of application of dropper manufacture material, for tradition side by introducing " weighing principle "
It can only be selected for the dropper of transparent glass material in formula, it, only need to be by weighing since the present invention no longer needs to carry out range estimation operation
Mode can meet measurement needs, and therefore, dropper can select steel to manufacture, and due to the material property that steel have, have
The machining accuracy of dropper endoporus can be greatly improved in precision machined ability, the steel dropper manufactured by Precision Machining mode,
Its hole size error will be far smaller than traditional transparent glass dropper.
(4) present invention can effectively evade the capillary pressure phenomenon of slim pipe diameter dropper
Since the dropper of the present invention has high hole size precision, the endoporus cross-sectional area of dropper several to measurement accuracy
It does not influence, therefore, when carrying out Micro airflow measurement, without selecting the dropper of slim pipe diameter that can meet measurement need
It wants, and then has effectively evaded the capillary pressure phenomenon for crossing slim pipe diameter dropper, so as to avoid the survey generated by capillary pressure phenomenon
Measure error；Further more, also need not often replace the dropper in different size aperture because of flow difference in measuring, therefore effectively simplify
Measurement procedure, is also effectively reduced hand labor intensity.
Description of the drawings
Fig. 1 is a kind of structure principle chart of burette type gas flow surveying instrument based on weighing principle of the present invention；
Fig. 2 is that the structure for the vapor stream vacuum pump pumping speed performance automatic measurement system built using the present invention in embodiment is former
Reason figure；
In figure, 1-electronic scale, 2-oil storage tanks, 3-droppers, 4-burette brackets, 5-intake valves, 6-reset valves, 7-
Three-way pipe, 8-computers, 9-fluid, 10-vapor stream vacuum pumps, 11-standard testing covers, 12-prime mechanical pumps, 13-
Backing line, 14-vacuum gauges.
Specific implementation mode
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
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, three-way pipe 7 and computer 8, the oil storage tank 2 are positioned over electronic scale 1
On, fluid 9 is stored in oil storage tank 2；The dropper 3 is vertically installed on burette bracket 4, and 3 lower end nozzle of dropper is located at storage
In oil groove 2 below 9 liquid level of fluid, and 3 tube body of dropper and oil storage tank 2 are contactless；3 upper end tube nozzle of the dropper and three-way pipe 7
First nozzle is connected, and the second nozzle of three-way pipe 7 is connected with the gas outlet of intake valve 5, the air inlet and air of intake valve 5
It communicates；The third nozzle of the three-way pipe 7 is connected with the air inlet of reset valve 6, the gas outlet of reset valve 6 and measurand
Air inlet is connected；The signal output end of the electronic scale 1 is connected with computer 8, is exported to electronic scale 1 by computer 8
Weighing data record and store in real time, and carries out timing to measurement process by computer 8.
The intake valve 5 and reset valve 6, which use, to be manually controlled or automatically controls, when using automatically controlling, intake valve 5
It opens and closes, the outlet flow-rate adjustment of reset valve 6 is controlled by computer 8.
The oil storage tank 2 is iso-cross-section in the vertical direction.
In order to reduce total supporting power of electronic scale 1, the oil storage tank 2 is made of PVC plastic material.
In order to avoid there are original measurement errors for transparent glass dropper, the dropper 3 is manufactured using steel material, and dropper
3 endoporus are iso-cross-section hole.
A kind of burette type gas flow measurement method based on weighing principle uses the drop based on weighing principle
Tubular gas flow measurement device, includes the following steps：
Step 1：It controls intake valve 5 to open, while the gas outlet of reset valve 6 being connected with the air inlet of measurand；
Step 2：Reset valve 6 is adjusted, make in reset valve 6 by gas flow meet the air inlet of measurand
It is required that；
Step 3：The reading of weighing of electronic scale 1 this moment is recorded by computer 8, the reading of weighing is initial reading of weighing
Number；
Step 4：It controls intake valve 5 to close, starts the continuous measurement of gas flow, in measurement process, in computer 8
Several continuous time points are recorded in real time, while recording the reading of weighing of the electronic scale 1 corresponding to Each point in time；
Step 5：When computer 8 judges to need to stop measuring, control intake valve 5 is opened, this measurement process is terminated；
Wherein, the judgement of computer 8, which measures, needs the condition stopped having following two：
1. when the air inlet of measurand requires to complete；
2. when the height that fluid 9 rises in dropper 3 meets or exceeds the fluid height allowable of setting；Wherein, pass through
Computer 8 judges that the height that fluid 9 rises in dropper 3 meets or exceeds the fluid height allowable of setting, and judgment basis is
Following conditional：
W≤W0-ρaL(1+a/A)
In formula, W is the reading of weighing in real time of electronic scale, W0For the initial reading of weighing of electronic scale, ρ is fluid density, and a is
The endoporus cross-sectional area of dropper, L are fluid height allowable, and A is the difference of the cross-sectional area of oil storage tank and dropper tube body；
Step 6：The gas flow in timing time section is calculated 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
Number, Wi+nFor the reading of weighing of timing time section finish time electronic scale, paFor local atmospheric pressure, a is that the endoporus of dropper is transversal
Area, ρ are fluid density, and g is local gravitational acceleration, and A is the difference of the cross-sectional area of oil storage tank and dropper tube body, V0For dropper
Total measurement (volume) in pipe at interior initial fluid liquid level to reset valve air inlet, W0For the initial reading of weighing of electronic scale, tiFor timing when
Between 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 needing to take multiple measurements, step 2 is repeated to step 6.
Measuring device using the present invention is built into vapor stream vacuum pump pumping speed performance automatic measurement system below
Embodiment needs vapor stream vacuum pump 10, standard testing cover 11, the prime machinery of setup test before measuring system is built
Pump 12 and backing line 13, is equipped with vacuum gauge 14 on standard testing cover 11, and the determination of the structure and parameter of above-mentioned component,
Fully according to national standard《GB/T19955.1-2005 steam stream vacuum performance measurement method part 1s：Volume flow rate (pumping speed)
Measurement》In regulation execute.As shown in Fig. 2, after the completion of vapor stream vacuum pump pumping speed performance automatic measurement system is built, you can
Proceed by measurement operation.
Preparation stage before measurement：First, in accordance with national standard《GB/T19955.1-2005 steam stream vacuum performances measure
Method part 1：The measurement of volume flow rate (pumping speed)》Defined operational method and step, in the condition that reset valve 6 completely closes
Under, start prime mechanical pump 12 and vapor stream vacuum pump 10 successively, prime mechanical pump 12 and vapor stream vacuum pump 10 is made to reach
Steady-working state.
The pressure debugging stage before measurement：It determines first and needs to carry out 10 inlet pressure of vapor stream vacuum pump that pumping speed measures
Range controls reset valve 6 by computer 8 and opens, make the gas in standard testing cover 11 under conditions of intake valve 5 is opened
The test pressure value close to every bit of pressure from low to high is balanced, concrete operation step is：The entrance of corresponding certain point setting
Pressure, computer 8 read the real balance pressure value in standard testing cover 11 by vacuum gauge 14, and with the inlet pressure of setting
Value compares, if real balance pressure value is higher than inlet pressure level, computer 8 controls reset valve 6 and reduces its valve opening,
Make in reset valve 6 by gas flow reduce, to make the real balance pressure reduction in standard testing cover 11；Conversely, such as
Fruit border balances pressure value and is less than inlet pressure level, then the control of computer 8 reset valve 6 increases its valve opening, makes in reset valve 6
By gas flow increase, to make the real balance pressure rise in standard testing cover 11；It carries out repeatedly, until mark
Degree of closeness in quasi- test cover 11 between real balance pressure and the inlet pressure of setting reaches License Value, is finally completed gas
The adjusting operation of flow and balance pressure.
Measuring phases：The initial reading of weighing of electronic scale 1 this moment is recorded by computer 8 first, is passing through computer 8
It controls intake valve 5 to close, starts the continuous measurement of gas flow, in measurement process, if recording involvement in real time in computer 8
Continuous time point, while the reading of weighing of the electronic scale 1 corresponding to Each point in time is recorded, and record the survey of vacuum gauge 14
Pressure reading in fixed standard testing cover 11, when computer 8 judges to need to stop measuring, (there are two Rule of judgment：1. true
Deviation between the pressure reading in standard testing cover 11 that sky rule 14 measure and the inlet pressure of setting exceeds License Value；2. when
When the height that fluid 9 rises in dropper 3 meets or exceeds the fluid height allowable of setting), control intake valve 5 is opened, and is terminated
This measurement process.
As a result calculation stages：First by the automatic calculated gas flow q of computer 8, measured in conjunction with vacuum gauge 14
Gas pressure p, finally pass through formula S=q/p can calculate vapor stream vacuum pump 10 speed of exhaust S.
The duplicate measurements stage completes the gas flow measurement under the inlet pressure of left point setting, and calculates left point
The speed of exhaust S of vapor stream vacuum pump 10 under the inlet pressure of setting.
Scheme in embodiment be not to limit the scope of patent protection of the present invention, it is all without departing from carried out by the present invention etc.
Effect implements or change, is both contained in the scope of the claims of this case.
Claims (3)
1. a kind of burette type gas flow measurement method based on weighing principle, uses the burette type gas based on weighing principle
Flow measurement device, the device include electronic scale, oil storage tank, dropper, burette bracket, intake valve, reset valve, three-way pipe and calculating
Machine, the oil storage tank are positioned on electronic scale, and fluid is stored in oil storage tank；The dropper is vertically installed at burette bracket
On, dropper lower end nozzle is located in oil storage tank below fluid liquid level, and dropper tube body and oil storage tank are contactless；The dropper upper end
Nozzle is connected with the first nozzle of three-way pipe, and the second nozzle of three-way pipe is connected with the gas outlet of intake valve, intake valve
Air inlet is communicated with air；The third nozzle of the three-way pipe is connected with the air inlet of reset valve, the gas outlet of reset valve with
The air inlet of measurand is connected；The signal output end of the electronic scale is connected with computer, by computer to electronic scale
The weighing data of output record and store in real time, and carries out timing to measurement process by computer；The intake valve and
Reset valve uses and manually controls or automatically control, when using automatically controlling, the open and close of intake valve, the outlet of reset valve
Flow-rate adjustment is controlled by computer；The oil storage tank is iso-cross-section in the vertical direction；The oil storage tank uses
Light material is made；The dropper is manufactured using non-transparent material, and dropper endoporus is iso-cross-section hole；It is characterized in that：Base
Include the following steps in the burette type gas flow measurement method of weighing principle：
Step 1：Inlet open is controlled, while the gas outlet of reset valve being connected with the air inlet of measurand；
Step 2：Reset valve is adjusted, make in reset valve by gas flow meet the air inlet requirement of measurand；
Step 3：The reading of weighing of electronic scale this moment is recorded by computer, the reading of weighing is initial reading of weighing；
Step 4：It controls intake valve to close, starts the continuous measurement of gas flow, in measurement process, note in real time in a computer
Several continuous time points under record, while recording the reading of weighing of the electronic scale corresponding to Each point in time；
Step 5：When computer-made decision needs to stop measuring, inlet open is controlled, this measurement process is terminated；
Step 6：The gas flow in timing time section is calculated in a computer, and 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+n
For 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, ρ
For fluid density, g is local gravitational acceleration, and A is the difference of the cross-sectional area of oil storage tank and dropper tube body, V0It is initial in dropper
Total measurement (volume) in pipe at fluid liquid level to reset valve air inlet, W0For the initial reading of weighing of electronic scale, tiFor at the beginning of timing time section
Begin the moment, 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 needing to take multiple measurements, step 2 is repeated to step 6.
2. the burette type gas flow measurement method according to claim 1 based on weighing principle, it is characterised in that：It calculates
Machine judgement, which measures, needs the condition stopped having following two：
1. when the air inlet of measurand requires to complete；
2. when the height that fluid rises in dropper meets or exceeds the fluid height allowable of setting.
3. the burette type gas flow measurement method according to claim 2 based on weighing principle, it is characterised in that：Pass through
The height that computer-made decision fluid rises in dropper meets or exceeds the fluid height allowable of setting, and judgment basis is as follows
Conditional：
W≤W0-ρaL(1+a/A)
In formula, W is the reading of weighing in real time of electronic scale, W0For the initial reading of weighing of electronic scale, ρ is fluid density, and a is dropper
Endoporus cross-sectional area, L is fluid height allowable, and A is the difference of the cross-sectional area of oil storage tank and dropper tube body.
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| CN201610186633.5A CN105651351B (en) | 2016-03-28 | 2016-03-28 | A kind of burette type gas flow surveying instrument and method based on weighing principle |
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| US4729236A (en) * | 1986-12-12 | 1988-03-08 | The United States Of America As Represented By The Secretary Of The Army | Automatic orifice calibrator |
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| CN101608615A (en) * | 2009-07-15 | 2009-12-23 | 东北大学 | Property of vapor stream vacuum pump automatic measuring system and method for measurement |
| CN202229791U (en) * | 2011-09-30 | 2012-05-23 | 浙江真空设备集团有限公司 | Vacuum dropper type flow meter device |
| CN202420582U (en) * | 2012-01-17 | 2012-09-05 | 十堰晨鹏机电科技有限公司 | Weighing type fuel oil consumption instrument |
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2016
- 2016-03-28 CN CN201610186633.5A patent/CN105651351B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4729236A (en) * | 1986-12-12 | 1988-03-08 | The United States Of America As Represented By The Secretary Of The Army | Automatic orifice calibrator |
| CN87206563U (en) * | 1987-04-15 | 1988-01-06 | 杭州柴油机总厂 | Automatic oil consumption meter with permeation-preventing mechanism |
| 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 |
| CN101608615A (en) * | 2009-07-15 | 2009-12-23 | 东北大学 | Property of vapor stream vacuum pump automatic measuring system and method for measurement |
| CN202229791U (en) * | 2011-09-30 | 2012-05-23 | 浙江真空设备集团有限公司 | Vacuum dropper type flow meter device |
| CN202420582U (en) * | 2012-01-17 | 2012-09-05 | 十堰晨鹏机电科技有限公司 | Weighing type fuel oil consumption instrument |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111006932A (en) * | 2019-12-02 | 2020-04-14 | 中国石油大学(北京) | System for be used for extraction experiment |
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| Publication number | Publication date |
|---|---|
| CN105651351A (en) | 2016-06-08 |
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