CN105588784A - A continuous measurement device for liquid densities - Google Patents
A continuous measurement device for liquid densities Download PDFInfo
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- CN105588784A CN105588784A CN201410571856.4A CN201410571856A CN105588784A CN 105588784 A CN105588784 A CN 105588784A CN 201410571856 A CN201410571856 A CN 201410571856A CN 105588784 A CN105588784 A CN 105588784A
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- fluid density
- liquid
- measuring device
- pressure sensor
- continuous measuring
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Abstract
A continuous measurement device for liquid densities is disclosed. The device comprises at least two pressure sensors, a signal processing circuit (9) and a floating object (1), wherein any two pressure sensors are different in vertical height, and the pressure sensors are used for outputting different electric signals according to liquid pressures when being put into liquid, the signal processing circuit (9) is separately electrically connected to the pressure sensors, and is used for separately receiving the electric signals of each of the pressure sensors, acquiring liquid density values according to the electric signals and storing the liquid density values, and the floating object (1) is used for allowing the device to float freely in the liquid. The device can continuously measure liquid densities, and can monitor liquid density changes in real time, thus reducing labor density.
Description
Technical field
The present invention relates to measure the device of fluid density, particularly, relate to a kind of fluid density continuous measurementDevice.
Background technology
Conventionally environmental administration, in order to monitor pollution of estuary situation, needs often to measure the density of river. ExistingThe method of measuring river density is mainly: gather the liquid that needs measurement, density sensor is positioned over to dressHave in the container of liquid to be measured and measure, or need to carry existing liquid density sensor to specified measurementPlace is measured. Existing measurement mechanism does not have the ability of fluid density continuous measurement, therefore environmental protectionDepartment need to spend a large amount of manpower and materials in the time of monitoring river water density.
And in actual applications, the impact of the factor such as flow, fluidised form of considering liquid on density measure,The method of existing measurement river density has larger error.
Summary of the invention
The object of this invention is to provide a kind of fluid density continuous measuring device, can continuous measurement fluid density,Real-Time Monitoring liquid density variation situation.
To achieve these goals, the invention provides a kind of fluid density continuous measuring device, described measurementDevice comprises: at least two pressure sensors, and between any two described pressure sensors, all have verticalStraight difference in height, for exporting the different signals of telecommunication according to born fluid pressure in the time being placed in liquid;Signal processing circuit, is electrically connected respectively each described pressure sensor, for receiving respectively each described pressureThe signal of telecommunication of sensor, and according to this signal of telecommunication, obtain fluid density numerical value storage; And buoyancy floats,Be used for making described measurement mechanism floating arbitrarily at liquid.
Preferably, described measurement mechanism also comprises: mass, and for described measurement mechanism can be suspendedIn liquid.
Preferably, described measurement mechanism also comprises: at least one cylinder, the top of described cylinder connects instituteState buoyancy and float, bottom connects and described mass, for accommodating described pressure sensor; And described cylinderBe provided with inlet, for making liquid can flow into described cylinder.
Preferably, described measurement mechanism also comprises: fixture, and for described pressure sensor is fixed onThe top of described cylinder, and make to there is vertical drop between any two described pressure sensors.
Preferably, the material of described fixture is gas permeability packing material.
Preferably, described cylinder is provided with gas outlet, discharges for the gas that makes described cylinder.
Preferably, described pressure sensor comprises: piezoelectric array, and in the time being subject to fluid pressure,Produce piezoelectricity electromotive force; Two plate electrodes, are arranged on the two ends of described piezoelectric array, in described pressureWhen electric material array produces piezoelectricity electromotive force, between two described electrodes, form electrical potential difference; Circuit load, instituteThe two ends of stating circuit load are electrically connected respectively electrode described in a slice, for described piezoelectric array withAnd two plate electrode form loop, form electrical potential difference between two plate electrodes time, generation current in loop.
Preferably, described signal processing circuit comprises: prefix operation amplifying circuit, and for by each described pressureThe signal of telecommunication of power sensor input carries out difference computing, and the difference signal that computing is obtained amplifies,Filtering; A/D converter, for being converted into numeral by the signal of telecommunication of described prefix operation amplifying circuit outputSignal; And microprocessor, for controlling described A/D converter and receiving the data signal of exporting, enterRow is processed, and obtains fluid density numerical value and stores.
Preferably, described signal processing circuit also comprises: display, and for showing described microprocessor placeThe fluid density numerical value obtaining after reason.
Preferably, described buoyancy floats for light China fir or hollow plastics.
Fluid density continuous measuring device of the present invention passes by least two pressure with vertical drop hSensor, can accurately calculate hydraulic pressure Δ P, further, according to Δ P=ρ gh, calculates liquid closeDegree, simple to operate, error is little. Fluid density continuous measuring device of the present invention is directly positioned over to lake, riverIn pool, the ratio of the buoyancy floating by the buoyancy of adjusting in measurement mechanism and the gravity of mass, can make instituteState measurement mechanism and be suspended in any degree of depth in rivers and lakes, can continuous measurement fluid density, in real time prisonThe situation of change of surveying fluid density, has reduced labour intensity.
Other features and advantages of the present invention are described in detail the detailed description of the invention part subsequently.
Brief description of the drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, withDetailed description of the invention one is below used from explanation the present invention, but is not construed as limiting the invention. ?In accompanying drawing:
Fig. 1 is the structural representation of fluid density continuous measuring device of the present invention.
Fig. 2 is the structural representation of pressure sensor.
Fig. 3 is the structural representation of signal processing circuit.
Description of reference numerals
1 buoyancy floats 2 first fixtures
3 mass 4 second fixtures
5 first pressure sensor 6 first inlets
7 second pressure sensor 8 second inlets
9 signal processing circuit 10 circuit loads
11 output line 12 piezoelectric arrays
13 liang of plate electrode 14 clads
15 prefix operation amplifying circuit 16 A/D converters
17 microprocessor 18 displays.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated. Should be understood that,Detailed description of the invention described herein only, for description and interpretation the present invention, is not limited to the present invention.
As shown in Figure 1, fluid density continuous measuring device of the present invention comprises at least two pressure sensors,Between any two described pressure sensors, all there is vertical drop, for basis in the time being placed in liquidThe fluid pressure bearing is exported the different signals of telecommunication; Signal processing circuit 9, is electrically connected respectively each instituteState pressure sensor, for receiving respectively the signal of telecommunication of each described pressure sensor, and according to this signal of telecommunicationObtain fluid density numerical value and store; And buoyancy floats 1, for making described measurement mechanism at liquid energyEnough floating arbitrarily, thus realize the object of continuous measurement. Wherein, described buoyancy floats 1 and is generally light China firOr hollow plastics.
In the present embodiment, be provided with altogether two pressure sensors, that is: the first pressure sensor 5 and secondPressure sensor 7. In addition, the present invention also can be provided with multiple pressure sensors, can obtain many simultaneouslyIndividual fluid density, calculating mean value, can make to measure more accurate.
Fluid density continuous measuring device of the present invention also comprises: mass 3, and for making described measurement mechanismFloat on a liquid. Wherein, described mass 3 can be piece of stainless steel. By adjust buoyancy float 1 floatingThe gravity ratio of power and mass 3, can make described measurement mechanism be suspended in any degree of depth such as rivers and lakes,Fluid density that can any degree of depth of continuous measurement.
Fluid density continuous measuring device of the present invention also comprises at least one cylinder, and the top of described cylinder connectsConnect described buoyancy and float 1, bottom connects described mass 3; For accommodating described pressure sensor; And instituteState cylinder and be provided with inlet, for making liquid can flow into described cylinder. Pressure sensor is arranged on instituteState in cylinder, can avoid liquid fluctuation or the impact that it is caused of flowing.
In the present embodiment, described cylinder is provided with two altogether, is equipped with respectively a pressure in each cylinderPower sensor, and correspondence arranges the first inlet 6 and the second inlet 8. Liquid is from the first inlet 6Enter in the first cylinder, the first pressure sensor 5 is exerted pressure. In like manner, liquid also can enter from secondIn liquid mouth 8, in the second cylinder, the second pressure sensor 7 is exerted pressure. Wherein, described the first cylinderCan be rigid with the material of the second cylinder. The parameter operated by rotary motion of described the first cylinder and the second cylinderFor: internal diameter is 15mm, and external diameter is 20mm, is highly 30mm-50mm. Described the first pressure passesSensor 5 and the second pressure sensor 7 are of a size of 10mm × 10mm, but not as limit.
Fluid density continuous measuring device of the present invention also comprises fixture, for described pressure sensor is solidFix on the top of described cylinder, and make to there is vertical drop between any two described pressure sensors.
In the present embodiment, the first pressure sensor 5 is fixed on described the first cylinder by the first fixture 2Top, the second pressure sensor 7 is fixed on the top of described the second cylinder by the second fixture 4. ItsIn, the material of described the first fixture 2 and the second fixture 4 is gas permeability packing material, and first is solidThe length of determining part 2 and the second fixture 4 not etc., thereby guarantee the first pressure sensor 5 and the second pressureSensor 7 has certain vertical drop. Generally, the larger measurement of described vertical drop hError is less. For improving the certainty of measurement of two described pressure sensors, the default distance of vertical drop hFrom being 10mm-30mm.
Wherein, described cylinder is provided with gas outlet, enters into respectively the first cylinder and the second cylinder at liquidIn after, the gas in liquid recipient, makes gas pass through the air-vent of described fixture and gas outlet rowGo out described cylinder, thereby avoided the impact of gas on certainty of measurement, reduce measure error.
Wherein, described pressure sensor can be packaged piezoelectric chip or nano generator. Nanometer generatingAs shown in Figure 2, it comprises machine: piezoelectric array 12, in the time being subject to fluid pressure, producing and pressElectricity electromotive force; Polymethyl methacrylate (PMMA) clad 14, for coated described piezoelectricArray 12, to improve the fastness of piezoelectric array 12; Two plate electrodes 13, are arranged on described piezoelectricityThe two ends of material array 12, in the time that described piezoelectric array 12 produces piezoelectricity gesture, described in twoBetween electrode, form electrical potential difference; Circuit load 10, the two ends of described circuit load 10 are electrically connected respectivelyElectrode described in a slice, for forming loop with described piezoelectric array 12 and two plate electrodes 13,While forming electrical potential difference between two plate electrodes 13, generation current in loop.
As shown in Figure 3, described signal processing circuit 9 comprises: prefix operation amplifying circuit 15, and for inciting somebody to actionThe signal of telecommunication of each described pressure sensor output carries out difference computing, and the difference signal that computing is obtained entersRow amplifies, filtering; A/D converter 16, for the telecommunications that described prefix operation amplifying circuit is exportedNumber be converted into data signal; Microprocessor 17, for controlling described A/D converter 16 and receiving outputData signal, process, obtain fluid density numerical value and store.
Described signal processing circuit 9 also comprises shows device 18, after showing that described microprocessor 17 is processedThe fluid density numerical value obtaining. Further, in described display 18, can show the liquid of continuous monitoringVariable density curve, is convenient to environmental administration it is analyzed and is monitored, and has reduced labour intensity.
As shown in Figure 1-Figure 3, fluid density continuous measuring device of the present invention be placed in need measure liquid orAmong person rivers and lakes time, float under 1 buoyancy described cylinder at the gravity of mass 3 and buoyancyCan partly be immersed in liquid or float on a liquid, and keep perpendicular to liquid level. Liquid is respectively from firstIn inlet 6 and the second inlet 8, enter the hollow parts that is full of cylinder, and respectively the first pressure is passedSensor 5 and the second pressure sensor 7 are exerted pressure. At described the first pressure sensor 5 and the second pressureSensor 7 is subject to the pressure from liquid, and its inner piezoelectric array 12 can compressed generation polarizationPhenomenon, thus at the contrary polarization charge of piezoelectric two ends polarization, make between two plate electrodes 13Form electrical potential difference. Electrical potential difference drive circuit load 10 electron streams move generation current, pass through output lineThe electric potential signal of the circuit load 10 of 11 output series connection. And pressure difference, 12 deformation of piezoelectric arrayDifference, piezoelectricity gesture difference, electric current difference, the electric potential signal difference of output. For improving pressure sensorCertainty of measurement, described pressure sensor to the distance of liquid level should at least be greater than 10mm.
Due to the vertical height difference of two packaged pressure sensors, the pressure difference that both are subject to,Thereby have different piezoelectricity gesture, the electric potential signal of output is also different.
Prefix operation amplifying circuit 15 in described signal processing circuit 9, for passing described the first pressureThe signal of telecommunication that sensor 5 and the second pressure sensor 7 are exported carries out difference computing, and computing is obtained poorValue signal amplifies, filtering; A/D converter 16 is exported described prefix operation amplifying circuit 15The signal of telecommunication is converted into data signal, after processing, obtains the first pressure sensor 5 Hes by microprocessor 17Pressure differential Δ P between the second pressure sensor 7, and further according to default vertical drop h withAnd formula Δ P=ρ gh can calculate the density of liquid.
In the time of liquid density variation, because the sense of continuity of piezoelectric array 12 counter stresses is answered, outputOpen circuit potential signal is analog signal, by signal processing, can show the close of liquid by display 18Degree change curve, thereby monitoring liquid density that can be real-time, reduce labour intensity.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail, still, the present invention does not limitDetail in above-mentioned embodiment, within the scope of technical conceive of the present invention, can be to the present inventionTechnical scheme carry out multiple simple variant, these simple variant all belong to protection scope of the present invention.
It should be noted that, in the present embodiment, described pressure sensor is packaged piezoelectric battle arrayThe nano generator of row composition, but do not limit protection scope of the present invention, passable in concrete practiceFor the pressure sensor of any other version.
It should be noted that in addition, each the concrete technical characterictic described in above-mentioned detailed description of the invention,In reconcilable situation, can combine by any suitable mode, for fear of unnecessaryRepeat, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as itsWithout prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. a fluid density continuous measuring device, is characterized in that, described measurement mechanism comprises:
At least two pressure sensors, and all there is vertical height between any two described pressure sensorsPoor, for export the different signals of telecommunication according to born fluid pressure in the time being placed in liquid;
Signal processing circuit (9), is electrically connected respectively each described pressure sensor, each for receiving respectivelyThe signal of telecommunication of described pressure sensor, and according to this signal of telecommunication, obtain fluid density numerical value and store; WithAnd
Buoyancy floats (1), for making described measurement mechanism floating arbitrarily at liquid.
2. fluid density continuous measuring device according to claim 1, is characterized in that, described inMeasurement mechanism also comprises:
Mass (3), for can floating on a liquid described measurement mechanism.
3. fluid density continuous measuring device according to claim 2, is characterized in that, described inMeasurement mechanism also comprises:
At least one cylinder, the top of described cylinder connects described buoyancy and floats (1), bottom connect with described inMass (3), for accommodating described pressure sensor; And described cylinder is provided with inlet, for makingLiquid can flow into described cylinder.
4. fluid density continuous measuring device according to claim 3, is characterized in that, described inMeasurement mechanism also comprises:
Fixture, for described pressure sensor being fixed on to the top of described cylinder, and makes any twoBetween described pressure sensor, there is vertical drop.
5. fluid density continuous measuring device according to claim 4, is characterized in that, described inThe material of fixture is gas permeability packing material.
6. fluid density continuous measuring device according to claim 3, is characterized in that, described inCylinder is provided with gas outlet, discharges for the gas that makes described cylinder.
7. according to the fluid density continuous measuring device described in any one in claim 1-6, its featureBe, described pressure sensor comprises:
Piezoelectric array (12), in the time being subject to fluid pressure, produces piezoelectricity electromotive force;
Two plate electrodes (13), are arranged on the two ends of described piezoelectric array (12), for describedWhen piezoelectric array (12) produces piezoelectricity electromotive force, between two described electrodes, form electrical potential difference;
Circuit load (10), the two ends of described circuit load are electrically connected respectively electrode described in a slice, useIn forming loop with described piezoelectric array (12) and two plate electrodes (13), in two plate electrodes (13)Between while forming electrical potential difference, generation current in loop.
8. according to the fluid density continuous measuring device described in any one in claim 1-6, its featureBe, described signal processing circuit (9) comprising:
Prefix operation amplifying circuit (15), for carrying out the signal of telecommunication of each described pressure sensor inputDifference computing, and the difference signal that computing is obtained amplifies, filtering;
A/D converter (16), for the signal of telecommunication that described prefix operation amplifying circuit (15) is exportedBe converted into data signal; And
Microprocessor (17), for controlling described A/D converter (16) and receiving the numeral letter of exportingNumber, process, obtain fluid density numerical value storage.
9. fluid density continuous measuring device according to claim 8, is characterized in that, described inSignal processing circuit (9) also comprises:
Display (18), for showing the fluid density number obtaining after described microprocessor (17) is processedValue.
10. according to the fluid density continuous measuring device described in any one in claim 1-6, its featureBe, described buoyancy floats (1) for plastics or light China fir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410571856.4A CN105588784A (en) | 2014-10-23 | 2014-10-23 | A continuous measurement device for liquid densities |
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| CN201410571856.4A CN105588784A (en) | 2014-10-23 | 2014-10-23 | A continuous measurement device for liquid densities |
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| CN201410571856.4A Pending CN105588784A (en) | 2014-10-23 | 2014-10-23 | A continuous measurement device for liquid densities |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865975A (en) * | 2016-06-15 | 2016-08-17 | 上海隧道工程有限公司 | Slurry proportion detection device and method for slurry shield |
| CN109443986A (en) * | 2018-09-27 | 2019-03-08 | 国家能源投资集团有限责任公司 | Cooling tower spray density measuring device |
| CN110632253A (en) * | 2018-06-22 | 2019-12-31 | 中国石油天然气股份有限公司 | Compression coefficient detection device |
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Patent Citations (6)
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| CN101762436A (en) * | 2010-01-06 | 2010-06-30 | 李彬 | Liquid density measurement device and measurement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105865975A (en) * | 2016-06-15 | 2016-08-17 | 上海隧道工程有限公司 | Slurry proportion detection device and method for slurry shield |
| CN110632253A (en) * | 2018-06-22 | 2019-12-31 | 中国石油天然气股份有限公司 | Compression coefficient detection device |
| CN109443986A (en) * | 2018-09-27 | 2019-03-08 | 国家能源投资集团有限责任公司 | Cooling tower spray density measuring device |
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