CN102486391A - Bubble type automatic proportion correction liquid level meter - Google Patents
Bubble type automatic proportion correction liquid level meter Download PDFInfo
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- CN102486391A CN102486391A CN2010105719925A CN201010571992A CN102486391A CN 102486391 A CN102486391 A CN 102486391A CN 2010105719925 A CN2010105719925 A CN 2010105719925A CN 201010571992 A CN201010571992 A CN 201010571992A CN 102486391 A CN102486391 A CN 102486391A
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Abstract
The invention relates to a bubble type automatic proportion correction liquid level meter, which can continuously measure liquid levels and proportion of size with corrosion property, inflammability and high viscosity and size with liquid and solid two phases. In the invention, the liquid level and proportion of a liquid medium in an open container or a normally-pressure closed container are measured by the physical principle of measuring the pressure in the liquid by a blowing bubble method, a liquid measurement value is timely corrected by the proportion, the defect that the accuracy of the existing pressure measurement liquid level meter is influenced by the changes of the proportion of the medium can be overcome, in addition, the acting force between a pressure measurement part and a measured medium is transferred by air, so that the conditions that a measurement instrument is rusted and a pressure transmitting pipeline is blocked can be avoided, the reliability is improved, the structure is simple, the manufacture is easy, the cost is low, and the use and the maintenance are convenient.
Description
Affiliated technical field
The present invention relates to have corrosivity in a kind of continuous coverage container, high viscosity, high dense filthy liquid medium and the liquid level of liquid-solid two phase slurries and the aut.eq. of proportion.
Background technology
Utilize in the existing pressure measurement formula liquid level gauge type of measuring liquid internal pressure principle measuring liquid level; One type is ' pilot formula ' liquid level gauge; That is: the fluid to be measured medium is led in the instrument of gaging pressure or differential pressure through connecting pipe from container; The pressure of the pressure measurement parts perception leading point of instrument, this pressure values is to putting the degree of depth apart from liquid free surface, i.e. level value; Another kind of is ' throw-in type ' liquid level gauge, that is: the pressure transducer that will have waterproof construction is put into the liquid pressure of this point of container bottom perception of fluid to be measured medium, and the corresponding perception point of this pressure values is apart from the degree of depth of liquid free surface, i.e. level value.Said two types of prior aries have following defective: one of which; The pressure measurement parts all directly contact with the fluid to be measured medium; Particularly when measurement has the liquid level of corrosivity, high viscosity, high dense filthy liquid medium and liquid-solid two phase slurries, because of phenomenons such as deposition, obstruction, corrosion, fouling cause the failure rate of measurement instrument high; Also must consider blast resistance construction or essential safety design when being used to measure the liquid level of inflammability liquid medium.They are two years old; The influence that the level gauging precision is changed by fluid to be measured medium proportion; Liquid internal pressure value by pressure transducer is measured must be passed through the level value that the proportion correction just can obtain reality; Existing pressure measurement formula liquid level gauge does not possess this function, to such an extent as to manufacturer has to limit the proportion of fluid to be measured medium and changes and can not exceed certain limit for ensureing measuring accuracy.Yet in engineering reality, the proportion of said special liquid medium is unknown mostly and often is in the variation, utilizes existing pressure measurement formula liquid level gauge to have error in various degree, and error size depends on measured medium proportion variation range.For remedying the deficiency of prior art; The present invention provides a kind of know-why of utilizing bubble method to measure liquid internal pressure to measure the liquid level and the proportion of aforesaid liquid medium simultaneously, thereby and revises the aut.eq. that the liquid level measured value obtains the exact filling level value in real time according to the specific gravity test value.
Summary of the invention
The present invention is based on bubble method and measure the physics principle of liquid internal pressure: the air-flow of constant flow rate is fed one section wireway that injects the liquid in container medium; Bubble will be arranged from the terminal effusion liquid surface continuously of wireway when air-flow is enough to overcome the liquid medium resistance, pressure P in the wireway and wireway end are positioned at the following depth H in liquid free face at this moment has following relation:
P＝Hgρ+υR (1)
In the formula, the terminal degree of depth of inserting liquid of H-wireway; The g-constant; ρ-liquid specific gravity; υ-gas velocity; R-wireway resistance.Second the υ R in formula (1) right side is the pressure loss of air-flow in wireway, and be certain when wireway length, gas velocity is low and when constant, pressure loss υ R can be considered constant C, thus:
P=Hg ρ+C, or
H＝P/gρ-C (2)
Formula (2) shows: when the proportion of fluid to be measured medium was stable constant value, air guide intraductal pressure P was promptly corresponding to the degree of depth of tracheae end-to-end distance from liquid free surface, that is corresponding liquid level H.If the fluid to be measured medium is water, promptly proportion is 1, after deducting as instrument constant through unit conversion and with constant term g ρ and C, can directly represent water surface elevation H with the pressure P in the wireway.When containing other material in the water or measuring other liquid medium, as still then error occurring with pressure values direct representation liquid level, error size is relevant with the proportion of liquid medium.Be accurate measuring liquid level value, must measure the proportion of fluid to be measured medium simultaneously, and the pressure values of being measured by pressure transducer is revised, just can obtain level value accurately with rate of specific gravity.
The measuring method of liquid medium proportion is: the gas shunting of constant flow rate is fed two wireways that inject the liquid in container medium respectively; And insertion depth does not wait; Vertical range between two wireway gas outlets is known number L, and its occurrence is selected according to the variation range of fluid to be measured medium proportion; Feed the air-flows that flow velocitys equate to two wireways, then the gas outlet below wireway in pressure be:
P
Down=Hg ρ+C
Pressure in the wireway up of gas outlet is:
P
On=(H-L) g ρ+C
Pressure reduction in two wireways:
Δ P=P
Down-P
On=Lg ρ (3)
Get the relational expression between pressure differential and the liquid medium proportion thus:
ρ＝ΔP/Lg (4)
Formula (4) shows measures the proportion ρ that two wireway internal pressure difference Δ P promptly represent measured medium, and Lg is a known number in the formula, handles as meter constant.
With (4) formula substitution (2) formula, omit constant term C, the relationship of pressure measurement formula liquid level gauge that then has the proportion correction is following:
H＝L(P/ΔP) (5)
H-actual liquid level value in the formula; The measured value of P-pressure transducer; The measured value of Δ P-differential pressure pick-up; Vertical range between two wireway gas outlets of L-, concrete numerical value is looked the fluid to be measured specific gravity range and is decided.
Formula (5) is the mathematics foundation that the present invention designs pressure measurement formula liquid level gauge.
The pressure measurement parts that adopt one of beneficial effect of the present invention to be based on the present invention's design and the liquid level gauge of making directly do not contact with the fluid to be measured medium; But through the gas transfer acting force; So can avoid causing existing pilot formula and the normal fault that occurs of called putting-into-type liquid level meter because of the fluid to be measured medium produces deposition, obstruction, corrosion, fouling etc.; Improve reliability, prolonged serviceable life; Two of beneficial effect is based on the liquid level gauge of the present invention's design and making and can measures the proportion of fluid to be measured medium simultaneously and revise the pressure values that is recorded by pressure transducer in real time, thereby has improved the measuring accuracy of pressure measurement formula liquid level gauge; It is simple in structure that three of beneficial effect is based on the liquid level gauge that the present invention designs and produces, and is easy to make, and with low cost, working service is easy.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 utilizes bubble method to measure the gas circuit and the circuit theory diagrams of the know-why measuring liquid level of liquid pressure, and Fig. 1 (a) is that wireway just inserts from container, and Fig. 1 (b) inserts from container side for wireway.
Among the figure, 1-source of the gas, 2-barometric damper, 3-flowmeter, 4-wireway, 5-pressure transducer, 6-indicator.
Fig. 2 utilizes bubble method to measure know-why measuring liquid level and the proportion and the real-time gas circuit and the circuit theory diagrams of revising the pressure measurement value of liquid pressure, and Fig. 2 (a) is that wireway just inserts from container, and Fig. 2 (b) inserts from container side for wireway.
Among the figure, 1-source of the gas, 2, the 3-barometric damper, 4, the 5-flowmeter, 6, the 7-wireway, 8-differential pressure pick-up, 9-pressure transducer, 10-divider, 11-level measurement meter, 12-proportion indicator.
Embodiment
In Fig. 1, the output gas flow of source of the gas (1) through barometric damper (2) and the flowmeter (3) of series connection after respectively with the pressure taps connection of the air intake opening and the pressure transducer (5) of wireway (4); The output signal of said pressure transducer connects indicator (6).Method of operating: control valve (2) makes the indication of flowmeter (3) keep stable, and concrete flow speed value has bubble effusion liquid level degree of being in rapid succession with the outlet of wireway; When measured medium was water, the force value shown in the indicator (6) was the representation level height H.
In Fig. 2, the output gas flow of source of the gas (1) is divided into two-way: one tunnel air communication is connected with the air intake opening of wireway (7), the hyperbaric chamber of differential pressure pick-up (8) and the pressure taps of pressure transducer (9) respectively after crossing barometric damper (3) and the flowmeter (5) of series connection; Another road air communication is connected with the air intake opening of wireway (6) and the low-pressure chamber of differential pressure pick-up (8) respectively after crossing barometric damper (2) and the flowmeter (4) of series connection; The output signal of said pressure transducer and differential pressure pick-up connects two input ends of divider (10); In divider (10) with pressure signal divided by differential pressure signal; The displayed value of indicator (11) is through the revised liquid level exact value of proportion, and the displayed value of indicator (12) is the proportion of measured medium.
Parts specification and data that the embodiment of the invention is selected for use are following: the measurement range 0-10kpa of pressure transducer, precision 0.5%, output signal 4-20mA; The measurement range of differential pressure pick-up: 0-1500pa, precision 0.2%, output signal 4-20mA; Divider (10) is chosen commercially available multiplication and division module, input/output signal: 4-20mA; Commercially available 4-20mA digital instrument is chosen in indicator (11) and (12); The wireway material is a teflon, bore 4mm, the gas outlet vertical range L=100mm of wireway (6) and (7); The float type flow meter of commercially available band needle valve is chosen in flowmeter (4), (5), and full scale is 0-1L/min; Gas velocity changes to 500ml/min gradually from 100ml/min, and measurement result is not had obvious influence, gets 200ml/min as experimental data; Source of the gas is provided by commercially available micro air pump, flow range: 0-51/min.
The present invention also can be used for measuring the material level and the proportion of molten metal or nonmetallic substance.
When measured medium can not contact with air, source of the gas was replaced by nitrogen or other inert gas steel cylinder.
Claims (6)
1. the liquid level of liquid medium and the aut.eq. of proportion in the continuous coverage container; Form by source of the gas (1), barometric damper (2) and (3), flowmeter (4) and (5), wireway (6) and (7), differential pressure pick-up (8), pressure transducer (9), divider (10) and indicator (11), (12); It is characterized in that: the exit flow of source of the gas (1) is divided into two-way, and wherein one tunnel air communication is connected with the air intake opening of wireway (7), the hyperbaric chamber of differential pressure pick-up (8) and the pressure taps of pressure transducer (9) respectively after crossing barometric damper (3) and the flowmeter (5) of series connection; Another road air communication is connected with the air intake opening of wireway (6) and the low-pressure chamber of differential pressure pick-up (8) respectively after crossing barometric damper (2) and the flowmeter (4) of series connection; The output of pressure transducer (9) and differential pressure pick-up (8) connects two groups of input terminals of divider (10); In divider (10), the output valve of the pressure transducer output valve divided by differential pressure pick-up is through the revised liquid level exact value of proportion; Show that by indicator (11) proportion of measured medium is shown by indicator (12).
2. according to the said device of claim 1, it is characterized in that: measure the proportion that the interior pressure differential of wireway (6) and (7) promptly obtains the fluid to be measured medium.
3. according to the said device of claim 1, it is characterized in that: two wireways (6) and (7) of the inserting liquid value of vertical range L of giving vent to anger between the port is looked fluid to be measured medium proportion variation range and is decided.
4. according to the said device of claim 1, it is characterized in that: divider (10) and indicator (11), (12) can merge with the smart instrumentation with calculation function and replace.
5. according to the said device of claim 1, it is characterized in that: material level and the proportion that can measure molten metal or nonmetallic substance.
6. according to the said device of claim 1, it is characterized in that: when measured medium can not contact with air, source of the gas (1) can change pure nitrogen gas pipeline or other inert gas steel cylinder into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105719925A CN102486391A (en) | 2010-12-03 | 2010-12-03 | Bubble type automatic proportion correction liquid level meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105719925A CN102486391A (en) | 2010-12-03 | 2010-12-03 | Bubble type automatic proportion correction liquid level meter |
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| CN102486391A true CN102486391A (en) | 2012-06-06 |
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| CN2010105719925A Pending CN102486391A (en) | 2010-12-03 | 2010-12-03 | Bubble type automatic proportion correction liquid level meter |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928151A (en) * | 2012-11-14 | 2013-02-13 | 中国科学院工程热物理研究所 | Pressure measuring method and device for liquid metal |
| CN105021253A (en) * | 2015-07-17 | 2015-11-04 | 烟台东泽电气科技有限公司 | Bubble type liquid level remote-measuring system |
| CN105352563A (en) * | 2015-12-10 | 2016-02-24 | 江南大学 | Anti-corrosion liquid level detection device and anti-corrosion liquid level detection method |
| CN105466520A (en) * | 2015-12-29 | 2016-04-06 | 浙江大学 | Flow velocity and flow measurement device with pressure stabilizer and method thereof |
| EP2706329A3 (en) * | 2012-09-11 | 2016-05-25 | GE-Hitachi Nuclear Energy Americas LLC | Method and system for a spent fuel pool level measurement without electrical power |
| CN106932137A (en) * | 2017-03-08 | 2017-07-07 | 清华大学 | A kind of long-range real-time measurement system of fluid pressure |
| CN108759975A (en) * | 2018-05-24 | 2018-11-06 | 首钢智新迁安电磁材料有限公司 | A kind of gas pressure guiding level sensing structure and liquid level gauge |
| CN109029639A (en) * | 2018-05-31 | 2018-12-18 | 安徽工程大学 | A kind of liquid level detection device |
| CN113120838A (en) * | 2019-12-30 | 2021-07-16 | 中国石油天然气股份有限公司 | Liquid medium transmission device |
| CN113640176A (en) * | 2021-07-30 | 2021-11-12 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Lime milk specific gravity measuring method, device and system and computer readable storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046977A (en) * | 1990-05-26 | 1990-11-14 | 自贡市轻工业设计研究院 | Differential pressure transmitter is measured vacuum salt production salt slurry solid-to-liquid ratio |
| CN1118066A (en) * | 1994-08-27 | 1996-03-06 | 北京市西城区新开通用试验厂 | Multi-tube liquid specific gravity and container liquid-level measuring unit. |
| CN2525478Y (en) * | 2000-05-16 | 2002-12-11 | 吕武轩 | Non-contact pressure measuring type sewage flow meter with gravity automatic correcting function |
| CN2656994Y (en) * | 2003-12-02 | 2004-11-17 | 冯长周 | Liquid level-concentration measuring device |
| US7464589B2 (en) * | 2004-06-30 | 2008-12-16 | The Mosaic Company | Submarine sampler |
-
2010
- 2010-12-03 CN CN2010105719925A patent/CN102486391A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046977A (en) * | 1990-05-26 | 1990-11-14 | 自贡市轻工业设计研究院 | Differential pressure transmitter is measured vacuum salt production salt slurry solid-to-liquid ratio |
| CN1118066A (en) * | 1994-08-27 | 1996-03-06 | 北京市西城区新开通用试验厂 | Multi-tube liquid specific gravity and container liquid-level measuring unit. |
| CN2525478Y (en) * | 2000-05-16 | 2002-12-11 | 吕武轩 | Non-contact pressure measuring type sewage flow meter with gravity automatic correcting function |
| CN2656994Y (en) * | 2003-12-02 | 2004-11-17 | 冯长周 | Liquid level-concentration measuring device |
| US7464589B2 (en) * | 2004-06-30 | 2008-12-16 | The Mosaic Company | Submarine sampler |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2706329A3 (en) * | 2012-09-11 | 2016-05-25 | GE-Hitachi Nuclear Energy Americas LLC | Method and system for a spent fuel pool level measurement without electrical power |
| CN102928151B (en) * | 2012-11-14 | 2014-12-24 | 中国科学院工程热物理研究所 | Pressure measuring method and device for liquid metal |
| CN102928151A (en) * | 2012-11-14 | 2013-02-13 | 中国科学院工程热物理研究所 | Pressure measuring method and device for liquid metal |
| CN105021253A (en) * | 2015-07-17 | 2015-11-04 | 烟台东泽电气科技有限公司 | Bubble type liquid level remote-measuring system |
| CN105352563B (en) * | 2015-12-10 | 2018-11-30 | 江南大学 | A kind of anticorrosion liquid level detection device |
| CN105352563A (en) * | 2015-12-10 | 2016-02-24 | 江南大学 | Anti-corrosion liquid level detection device and anti-corrosion liquid level detection method |
| CN105466520A (en) * | 2015-12-29 | 2016-04-06 | 浙江大学 | Flow velocity and flow measurement device with pressure stabilizer and method thereof |
| CN106932137A (en) * | 2017-03-08 | 2017-07-07 | 清华大学 | A kind of long-range real-time measurement system of fluid pressure |
| CN106932137B (en) * | 2017-03-08 | 2019-05-14 | 清华大学 | A kind of long-range real-time measurement system of fluid pressure |
| CN108759975A (en) * | 2018-05-24 | 2018-11-06 | 首钢智新迁安电磁材料有限公司 | A kind of gas pressure guiding level sensing structure and liquid level gauge |
| CN109029639A (en) * | 2018-05-31 | 2018-12-18 | 安徽工程大学 | A kind of liquid level detection device |
| CN109029639B (en) * | 2018-05-31 | 2019-11-29 | 安徽工程大学 | A kind of liquid level detection device |
| CN113120838A (en) * | 2019-12-30 | 2021-07-16 | 中国石油天然气股份有限公司 | Liquid medium transmission device |
| CN113120838B (en) * | 2019-12-30 | 2023-01-06 | 中国石油天然气股份有限公司 | Liquid medium transmission device |
| CN113640176A (en) * | 2021-07-30 | 2021-11-12 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Lime milk specific gravity measuring method, device and system and computer readable storage medium |
| CN113640176B (en) * | 2021-07-30 | 2024-02-20 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Lime milk specific gravity measuring method, device, system and computer readable storage medium |
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Application publication date: 20120606 |