CN87214417U - Density type liquid concentration gauge - Google Patents
Density type liquid concentration gauge Download PDFInfo
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- CN87214417U CN87214417U CN 87214417 CN87214417U CN87214417U CN 87214417 U CN87214417 U CN 87214417U CN 87214417 CN87214417 CN 87214417 CN 87214417 U CN87214417 U CN 87214417U CN 87214417 U CN87214417 U CN 87214417U
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Abstract
The utility model relates to a density type liquid concentration gauge, mainly comprising a float, a buoyancy chamber, an electrical resistance strain sensor, a suspender, a data processing device, etc. The utility model is used for the automatic continuous on-line measuring of the concentration of various liquid such as sulfuric acid, ammonium sulphite, etc. The utility model is especially suitable for the automatic continuous measuring of 93% concentration in the process of sulfuric acid production. The utility model has the advantages that temperature compensation and linearizing processing are realized by adopting the microcomputer technology, and the balance mechanism of existing density type liquid concentration gauge is replaced by adopting the electrical resistance strain sensor. The utility model can remarkably reduce the production cost of the concentration gauge and can simplify the concentration gauge structure, but also can achieve high measuring precision, having the popularization and use value in the industrial production.
Description
The utility model relates to the automatic continuous on-line detection device of multiple solution such as sulfuric acid ammonium sulfite, is particularly suitable for the automatic continuous detecting of 93% concentration in the sulphuric acid process.
In industrial processes, it mostly is by chemico-analytic method that the concentration of many solution detects, and this can not satisfy the needs of in good time controlling in the modern production process undoubtedly.When the concentration of a certain solution and its density have one-to-one relationship under a certain normal temperature, then can predict the concentration of certain solution indirectly by the method for measuring certain solution density.So-called densimetry just is based on Archimedes' principle, and the object that promptly is immersed in the liquid is subjected to buoyancy upwards, and the size of buoyancy equals the weight that this object arranges liquid.Therefore, as long as measure the buoyancy that is immersed in object in the solution under the uniform temperature, just can learn the density of this solution, just and know its corresponding concentration by density.In actual production, because the temperature of solution changes, therefore when measuring solution concentration, requirement is converted into solution density value under the design temperature with the solution density value that records under the different temperatures, and then find out corresponding with it solution concentration value, this just need carry out temperature-compensating and linearization process with the solution density value under the arbitrary temp measured in the operating temperature range.DFL-I density type solution concentration meter was once made by Japan, can survey the concentration of multiple solution such as sulfuric acid, this densimeter is mainly formed (seeing accompanying drawing 1) by float (21), float chamber (22), scale mechanism (23), pneumatic converter (24), gas/electric transducer (25), function generator (26), indicator controller (27).Float changes sulfuric acid density into buoyancy, and buoyancy is transformed into displacement by precision balance, and displacement changes the gas signal into by pneumatic converter, and the gas signal changes the signal of telecommunication into by gas/electric transducer.Temperature-compensating is to adopt the float self-compensation type, promptly is filled with the identical mixing material of the coefficient of cubical expansion of the coefficient of cubical expansion and detected solution in the float, and just float has non-linear expansion characteristics, thereby can realize temperature-compensating.Linearization process is to adopt function generator.Though this pattern densimeter is worked more stable reliable, the automatic continuous detecting needs of concentration in the solution production processes such as suitable sulfuric acid, its shortcoming also is conspicuous: the complex structure of (1) densimeter own, precision, manufacture difficulty is big; (2) need the expensive pneumatic converter of price, function generator etc. and compressed air source; (3) the higher high nichrome of float material require price, the manufacturing of self compensation float are also relatively more difficult, therefore, make this kind pattern densimeter cost height, are unfavorable for promoting the use of in China's industrial production.
Main purpose of the present utility model is to design a kind of novel density type solution concentration meter, can reduce the densimeter cost more significantly, makes it to have more the value of generally promoting the use of;
Another purpose of the utility model is to simplify the structure of densimeter as far as possible, makes it to be easy to make, and is easy to use.
The related density type solution concentration meter of the utility model is made up of test section and data processing equipment two large divisions, sees accompanying drawing 2.Test section mainly comprises float (1), float chamber (2) resistance strain sensor (3).Float chamber (2) has the import and export of detected solution, float places the detected solution of float chamber, be connected (seeing accompanying drawing 3) with suspension rod (5) between float (1) and resistance strain sensor (3), because the variation of detected solution concentration causes the variation of float buoyancy, by suspension rod (5) buoyancy is passed to resistance strain sensor, make the elastomer (6) that posts foil gauge produce corresponding deformation, so foil gauge produces corresponding change in electric, the signal of telecommunication of this variation is input in the data processing equipment (4) again.Float is double-deck hollow body, internal layer (18) is for guaranteeing the metal level of float intensity, as stainless steel, titanium and alloy thereof or other metals, outside (19) tightly coats polytetrafluoroethylene (PTFE), can prevent the erosion of strong acid and strong base solution, for also available single stainless steel of the not strong solution of corrosivity or ceramic hollow body.For floatage energy is adjusted as required, the material (20) that porose on float (17) can pack into and adjust float weight is as plumbous sand etc.Float adopts the metal internal layer except the intensity reason, also because polytetrafluoroethylene (PTFE) in 0～50 ℃ of scope, two-valued function appears in linear expansion coefficient, brings difficulty to measurement, adopt the metal internal layer to make float that more stable line expansion factor be arranged, can avoid diadic to occur.Because the detected solution variation of temperature causes the variation of density, must record the temperature of detected solution and the solution density under this temperature, be converted into the solution density under the design temperature, for this reason, be provided with thermometer (16) in the solution of float chamber, this thermometer is imported data processing equipment with the signal of telecommunication that temperature produced.Therefore, the effect of data processing equipment (4) is that solution density is carried out temperature-compensating and linearization process, the solution density value that is about to record under the different temperatures is converted into the density value under the design temperature, and the density value that will be converted into again under the design temperature is converted into corresponding concentration value.
About the temperature-compensating in the data processing equipment digital be take all factors into consideration temperature to solution density and temperature to float volume all with situation about exerting an influence under, set up with the method for experiment.As follows with equation expression:
a－K
1（V
p－V
t）±K
2
In the formula: the constant that a-is relevant with measurement category
K
1-temperature compensation coefficient, different solutions value difference generally measures with experimental technique,
V
pThe density signal of-buoyancy sensor
V
t-temperature signal
K
2The correction value of-temperature-compensating is decided according to the variations in temperature speed
Data processing equipment is after temperature-compensating is carried out in computing through following formula, carries out linearization process again, just obtains desired concentration value at last.
Said data processing equipment can adopt single board computer, single-chip microcomputer or other microcomputers.
Said data processing equipment also can adopt temperature-compensating bridge and linearizer to carry out signal and handle.
In order to improve the certainty of measurement and the stability of the said density type solution concentration of the utility model meter, and prevent that acid solution or acid mist in the float chamber from overflowing, make the suspension rod (5) that connects between float and resistance strain sensor pass sealing dashpot (7), fill Seal Oil (8) (as silicone oil, transformer oil or machine oil) in the sealing dashpot, hat cushioning fender (9) inserts in the Seal Oil (8) and with suspension rod (5) and links to each other, and the solution of float chamber or the sealed oil of etchant gas and hat cushioning fender are sealed.
In order to prevent that buoyancy from changing excessive or the operation reason causes that elastomer (6) is crooked excessive and damage resistance strain sensor, block (13) is set under elastomer (6) destroys to prevent resistance strain sensor as overload protection arrangement.In addition, also between sealing dashpot (7) and elastomer (6), be provided with zero point and range check verification agency (seeing accompanying drawing 3).When " zero point " the little turn-knob on the rotation test section, balance check hook (11) just slowly up moves, the little pallet (12) that will be fixed on the suspension rod (5) all drops on the verification hook (11) together with suspension rod (5) and the float that is attached thereto and buffering baffle plate weight such as (9), elastomer (6) is not subjected to external force, at this moment, check that the buoyancy signal of sensor is zero; When " range " the little turn-knob on the rotation test section, the range check hook (15) that sky is enclosed within on the suspension rod just slowly moves down, the hollow weights (14) that is equivalent to range 25% just drops on the little pallet (12) at leisure, at this moment, check that whether the indicated value of densimeter is than original indicated value decline 25%.When zero point and range depart from the error that is allowed, just tackle electric wiring and suitably adjust.Had after this cover zero point and the range check device, just can be in operation and carry out the dynamic zero point and the range check of densimeter easily.
The advantage of the said density type solution concentration of the utility model meter is:
(1) adopt Microcomputer Technology to realize temperature-compensating and linearization process, instruments such as the pneumatic converter of use value costliness, gas/electric transducer, function generator not, significantly reduced the densimeter cost, and data processing equipment has self check self-correcting and software function such as fault-tolerant, is convenient to very much maintenance.
(2) Floater Structure is simple, and cost is low, and is corrosion-resistant, working stability;
(3) adopt cheap, make easily and the resistance strain sensor of stable work in work replaces baroque scale mechanism;
(4) adopt the sealing dashpot, can prevent fully that solution or pernicious gas are by overflowing in the float chamber.
(5) the thermometer temperature sensing element is consistent to the time of solution temperature response with float, and effect temperature compensation is good.
Fig. 1 is Japanese DFL-1 type density type solution concentration meter schematic diagram.
Fig. 2 is the utility model density type solution concentration meter sketch.
Fig. 3 is the utility model density type solution concentration meter buoyancy sensor construction schematic diagram.
Fig. 4 is the float figure of the utility model density type solution concentration meter.
Fig. 5 is that the utility model density type solution concentration counting is according to the treating apparatus main program block diagram.
Fig. 6 is the utility model density type solution concentration meter and Japanese densimeter contrast recording curve, and wherein curve 1 is the recording curve of Japanese densimeter, and the curve that curve 2 records for densimeter of the present utility model, curve 3 are sulfuric acid thermograph curve.
Be non-limiting embodiment of the present utility model below:
1. use the utility model said density type solution concentration meter (accompanying drawing 2), (its float internal layer is a stainless steel, and skin is a polytetrafluoroethylene (PTFE); Micro computer adopts Z80 series (the two plate machines of MC-80) with Japanese DFL-1 type density type solution concentration meter (accompanying drawing 1) sulfuric acid of 91.5-94.5% to be measured, measured sulfuric acid concentration value and assay value contrast, and measure error is as follows:
About the main program block diagram of data processing equipment as shown in Figure 5.In main program block diagram, adopt the software delay method, every 30 seconds the density signal and the solution temperature signal of detected solution are distinguished continuous sampling four times, average then, search through data operation and concentration again, just can obtain needed concentration value, this concentration value send nixie display to demonstrate the concentration of detected solution and the temperature of solution respectively after the binary-coded decimal conversion.D/A converter is converted to analog quantity with the digital quantity of detected concentration simultaneously, exports to adjuster, as the conditioning signal of solution concentration.After repeating above-mentioned 10 times (5 minutes) sampling, data processing equipment will start printer automatically, and successively detected 10 sulphoxylic acid concentration values and sulfuric acid temperature value print.
Recording curve when accompanying drawing 6 is the utility model density type solution concentration meter and Japanese DFL-1 type density type solution concentration meter paired running, detected solution is the sulfuric acid of 91.5%～94.5% scope among the figure, curve 1 is the call wire of Japanese densimeter, curve 2 is the call wire of the utility model density type solution concentration meter, and curve 3 is a sulfuric acid thermograph line.From scheming as seen, the utility model density type solution concentration meter is followed the tracks of fine to Japanese DFL type density type solution concentration meter, and measure error is very nearly the same.
2. at the SO that absorbs with the ammonia absorption process in the flue gas during smelting
2Gas is produced in the process of ammonium sulfite product, the inferior salinity in the absorption liquid is to SO
2Absorptivity and whole production rate all will produce very big influence, (adopt the stainless steel float as the utility model density type solution concentration meter, resistance strain type sensor and temperature-compensating bridge and linearizer are as signal processing apparatus) another example, inferior salinity in the absorption liquid has been carried out on-line continuous measured automatically, its measurement result is as shown in the table.
Maximum relative error=(absolute error)/(instrument full scale) * 100=11/545 * 100=2
This detects the process of producing can satisfy production requirement.
Claims (6)
1, a kind of density type solution concentration meter comprises float (1), floating Chu chamber (2), buoyancy sensor, data processing equipment (4), it is characterized in that:
1. said float (1) is double-deck hollow body, and internal layer is metal level (18), and skin is polytetrafluoroethylene (PTFE) (19);
2. said and buoyancy sensor is a resistance strain sensor;
3. between float and electric resistance sensor, float and resistance strain sensor are coupled together with suspension rod;
4. in the detected solution of float chamber (2), be provided with thermometer (16) with measured temperature value input data processing equipment.
2,, it is characterized in that said data processing equipment is a micro computer according to the said density type solution concentration of claim 1 meter.
3,, it is characterized in that said data processing equipment is that the temperature-compensating bridge adds linearizer according to the miscible densimeter of the said density type of claim 1.
4, according to claim 1 or 2 or 3 said density type solution concentration meters, it is characterized in that suspension rod (5) passes sealing dashpot (7), Seal Oil (8) is housed in the said sealing dashpot (7), and hat cushioning fender (9) inserts in the Seal Oil (8) and is connected with suspension rod (5).
5, according to the said density type solution concentration of claim 4 meter, it is characterized in that:
1. the overload protection arrangement of block (13) as the buoyancy sensor be set under elastomer (6);
2. be provided with zero point and range check verification agency between sealing dashpot (7) and elastomer (6), said zero point and range check verification agency are by the balance check hook (11) that can move along the boom axis direction, in balance check hook (11) top and be fixed on little pallet on the suspension rod (5), be positioned at above the little pallet (12) the hollow weights (14) that moves along suspension rod (5) axis direction and the range check hook (15) of holding hollow weights (14) is formed.
6,, it is characterized in that said float (1) is the hollow body of being made by a kind of material in stainless steel, the pottery according to the said density type solution concentration of claim 1 meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87214417 CN87214417U (en) | 1987-10-22 | 1987-10-22 | Density type liquid concentration gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87214417 CN87214417U (en) | 1987-10-22 | 1987-10-22 | Density type liquid concentration gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87214417U true CN87214417U (en) | 1988-04-06 |
Family
ID=4828746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87214417 Withdrawn CN87214417U (en) | 1987-10-22 | 1987-10-22 | Density type liquid concentration gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87214417U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175568A (en) * | 2011-01-21 | 2011-09-07 | 长安大学 | Device for evaluating longer-term snow-melting property of salinization matter for automatically melting snows on road surface |
| CN101251462B (en) * | 2008-04-02 | 2011-09-07 | 罗放明 | Device and method for measuring liquid concentration in movable and static state |
| CN106153498A (en) * | 2015-04-22 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of new method detecting solute concentration in solution and device thereof |
| CN109060786A (en) * | 2018-08-25 | 2018-12-21 | 成都凯天电子股份有限公司 | Measure the detection method of industrial wastewater sulfuric acid concentration content |
| CN109187362A (en) * | 2018-10-30 | 2019-01-11 | 锦州艾德自动控制系统有限公司 | A kind of strength of fluid detection device and concentration of seawater detection suit |
| CN110794083A (en) * | 2019-11-11 | 2020-02-14 | 四川北方硝化棉股份有限公司 | Method for analyzing nitrocotton mixed acid components |
-
1987
- 1987-10-22 CN CN 87214417 patent/CN87214417U/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251462B (en) * | 2008-04-02 | 2011-09-07 | 罗放明 | Device and method for measuring liquid concentration in movable and static state |
| CN102175568A (en) * | 2011-01-21 | 2011-09-07 | 长安大学 | Device for evaluating longer-term snow-melting property of salinization matter for automatically melting snows on road surface |
| CN106153498A (en) * | 2015-04-22 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of new method detecting solute concentration in solution and device thereof |
| CN109060786A (en) * | 2018-08-25 | 2018-12-21 | 成都凯天电子股份有限公司 | Measure the detection method of industrial wastewater sulfuric acid concentration content |
| CN109060786B (en) * | 2018-08-25 | 2023-12-05 | 成都凯天电子股份有限公司 | Detection method for measuring sulfuric acid concentration content of industrial wastewater |
| CN109187362A (en) * | 2018-10-30 | 2019-01-11 | 锦州艾德自动控制系统有限公司 | A kind of strength of fluid detection device and concentration of seawater detection suit |
| CN110794083A (en) * | 2019-11-11 | 2020-02-14 | 四川北方硝化棉股份有限公司 | Method for analyzing nitrocotton mixed acid components |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| RN01 | Renewal of patent term | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |