CN107747990A - Liquid level emasuring device and the equipment with container - Google Patents
Liquid level emasuring device and the equipment with container Download PDFInfo
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- CN107747990A CN107747990A CN201711165374.9A CN201711165374A CN107747990A CN 107747990 A CN107747990 A CN 107747990A CN 201711165374 A CN201711165374 A CN 201711165374A CN 107747990 A CN107747990 A CN 107747990A
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
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- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
A kind of equipment the invention discloses liquid level emasuring device and with container, the liquid level emasuring device includes two conducting probes and liquid level detection circuit, two conducting probes are parallel and relative spacing is placed in the container of liquid level to be detected, and the liquid level detection circuit is electrically connected with two conducting probes；The liquid level detection circuit is used to detect the electrical conductivity between two conducting probes, and the height of the tank fill level is determined according to the electrical conductivity.The present invention can be applicable the level gauging of high-temp liquid, and cost is relatively low.
Description
Technical field
The present invention relates to level gauging field, more particularly to a kind of liquid level emasuring device and the equipment with container.
Background technology
Existing liquid level emasuring device mainly has following several:
1st, glass tube, current level situation is reflected by the parallel principle of liquid level and scale；
2nd, switch or ball float, liquid level change its state after reaching；
3rd, ultrasonic ranging method, liquid level range measurement is carried out by sending ultrasonic wave etc..
However, above-mentioned liquid level emasuring device is not suitable for high temperature level gauging, such as the level gauging of hot stove, because general
Logical glass tube, ultrasonic ranging and switch or ball float can not be placed directly within the liquid of high temperature, it is also necessary in structure
On do corresponding resistance to thermal design, cost of implementation is higher.
The content of the invention
It is a primary object of the present invention to provide a kind of liquid level emasuring device, it is intended to realize high-temp liquid by lower cost
Level gauging.
To achieve these goals, the present invention provides a kind of liquid level emasuring device, and the liquid level emasuring device is led including two
Electric probe and liquid level detection circuit, two conducting probes are parallel and relative spacing is placed in the container of liquid level to be detected, the liquid
Position detection circuit is electrically connected with two conducting probes；
The liquid level detection circuit is used for output pulse signal to two conducting probes, and detects two conductions
Electrical conductivity between probe, and determine according to the electrical conductivity height of the tank fill level.
Preferably, the liquid level detection circuit include control chip, the first amplifying circuit, the second amplifying circuit and voltage with
With circuit, the control chip has the first I/O mouths, the 2nd I/O mouths and AD detection mouths, the first I/O mouths of the control chip
Be connected with the input of first amplifying circuit, the output end of first amplifying circuit, the voltage follower circuit it is defeated
Enter end to be connected with each other with an electricity in two conducting probes, the output end of the voltage follower circuit detects with the AD
Mouth connection；2nd I/O mouths of the control chip are connected with the input of second amplifying circuit, second amplifying circuit
Output end electrically connected with another in two conducting probes；Wherein,
The control chip, for exporting pwm pulse signal by the first I/O mouths, amplify through first amplifying circuit
Export afterwards to one in two conducting probes；The control chip, it is additionally operable to by exporting PWM arteries and veins with the 2nd I/O mouths
Signal is rushed, is exported after second amplifying circuit amplification to another in two conducting probes；
The voltage follower circuit, for the detection signal of two conducting probes is carried out export after voltage follow to
The control chip.
Preferably, first amplifying circuit includes the first triode, first resistor, second resistance, 3rd resistor and the
One power supply, the first end of the first resistor are connected with first power supply, the second end of the first resistor with
The first end of the second resistance and the first I/O mouths interconnection, the second end of the second resistance and the one or three pole
The base stage connection of pipe, the grounded emitter of first triode, the colelctor electrode of first triode is through the 3rd resistor
It is connected with first power supply, the output end of extremely described first amplifying circuit of current collection of first triode.
Preferably, second amplifying circuit includes the second triode, the 5th resistance, the 6th resistance, the 7th resistance and the
Two power supplies, the first end of the 5th resistance are connected with second power supply, the second end of the 5th resistance with
The first end of 6th resistance and the 2nd I/O mouths interconnection, the second end and the two or three pole of the 6th resistance
The base stage connection of pipe, the grounded emitter of second triode, the colelctor electrode of second triode is through the 7th resistance
It is connected with second power supply, the output end of extremely described second amplifying circuit of current collection of second triode.
Preferably, the voltage follower circuit includes the first amplifier, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electricity
Resistance, the 8th resistance and the 3rd power supply, the first end of the 4th resistance is the input of the voltage follower circuit, described
The positive input interconnection at the second end of the 4th resistance, the first end of first electric capacity and first amplifier, described the
The second end ground connection of one electric capacity, reverse input end and its output end of first amplifier interconnect, the power supply of first amplifier
End is connected with the 3rd power supply, and the earth terminal of first amplifier is grounded, the first end of second electric capacity with it is described
The connection of the power end of first amplifier, the second end ground connection of second electric capacity；The output end of first amplifier is through described
The first end of eight resistance and the 3rd electric capacity interconnects, and one end of the interconnection is the output end of the voltage follower circuit, described
The second end ground connection of 3rd electric capacity.
Preferably, the liquid level detection circuit is electrically connected with two conducting probes respectively by connecting wire.
Preferably, two conducting probes are in cylinder, and both length are identical with cross-sectional diameter.
In addition, to achieve the above object, the present invention also provides a kind of equipment with container, and the equipment with container includes
Container and liquid level emasuring device as described above, the liquid level emasuring device include two conducting probes and liquid level detection circuit,
Two conducting probes of the liquid level emasuring device are vertically contour to be arranged in the container, and is led described in two
The horizontally spaced pre-determined distance of electric probe；The liquid level detection circuit is electrically connected with two conducting probes；Institute
State liquid level detection circuit and be used for output pulse signal to two conducting probes, and between two conducting probes of detection
Electrical conductivity, and determine according to the electrical conductivity height of the tank fill level.
Preferably, the equipment with container is hot stove.
By setting liquid level detection circuit and two conducting probes to connect, two conducting probes are placed in container and examined the present invention
Liquid level is surveyed, specifically, liquid level detection circuit detects two institutes by output pulse signal to two conducting probes
The electrical conductivity between conducting probe is stated, and the height of the tank fill level is determined according to the electrical conductivity, so just realizes liquid
The detection of position, due to conducting probe wide adaptability, and cost is relatively low, the level gauging of applicable high-temp liquid.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the measuring principle figure that liquid level emasuring device of the present invention carries out level gauging；
Fig. 2 is the electrical block diagram of liquid level emasuring device of the present invention；
Fig. 3 is the equivalent circuit diagram of liquid level emasuring device of the present invention.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention provides a kind of liquid level emasuring device, and for the level gauging of various equipment, be particularly suitable for use in high-temp liquid
In equipment.
Referring to figs. 1 to Fig. 3, in one embodiment, the liquid level emasuring device includes two conducting probes 100 and level sensing
Circuit 200, two conducting probes 100 are parallel and relative spacing is placed in the container 300 of liquid level to be detected, the level sensing electricity
Road 200 is electrically connected with two conducting probes 100.It should be appreciated that when being used for 300 level sensing of container, two
Conducting probe 100 be it is vertically contour be arranged in container 300, and two conducting probes 100 in the horizontal direction between
Every pre-determined distance.Wherein, liquid level detection circuit 200 is used for output pulse signal to two conducting probes 100, and detects two
Electrical conductivity between conducting probe 100 described in root, and determine according to the electrical conductivity height of the liquid level of container 300.
In the present embodiment, the liquid level detection circuit 200 can by connecting wire respectively with two conducting probes
100 electrical connections.The metal that any conductive material can be selected in two conducting probes 100 is made, and its length and shape should be identical.For
Convenient to calculate, two conducting probes 100 are in cylinder, and both length are identical with cross-sectional diameter.Certainly other real
Apply in example, can also be other forms, the present embodiment does not limit.
In the present embodiment, specifically, reference picture 3, Fig. 3 is the equivalent circuit diagram of this liquid level emasuring device, wherein, R20 is just
It is the equivalent resistance between two conducting probes 100, it depends on the height of water level between two conducting probes 100.When two conductive spies
Pin 100 is inserted in solution, can measure the resistance value R20 between two conducting probes 100, according to Ohm's law, this resistance value with
The spacing L (cm) of conducting probe 100 is directly proportional, is inversely proportional with the sectional area A (cm2, square centimeter) of electrode.I.e.：R20=ρ * L/
A, ρ are resistivity.From equivalent circuit diagram it can be seen that, it is assumed that VCC U10, AD_IO measured value are U20, then U20/R20=
U10/ (R10+R20), so R20=U20*R10/ (U10-U20).It can be readily appreciated that for two conducting probes 100
Say, spacing L is fixed value, and sectional area A=S*h, S are the bottom girth of conducting probe 100, and fixed value, then, R20=ρ *
L/S*h, wherein h are height of water level, it is assumed that ρ * L/S are constant k, then R20=k*h.
U20*R10/ (U10-U20)=k*h can be obtained by the combination of two above formula, that is, pass through liquid level detection circuit 200
Measure U20 values, you can height of water level h value is conversed, in this way, the height of the inside liquid level of container 300 can be known.
It is understood that due to the wide adaptability of conducting probe 100, cost is relatively low, applicable various high and low temperature liquid
Level gauging.
In an alternative embodiment, the liquid level detection circuit 200 include control chip MCU, the first amplifying circuit 201,
Second amplifying circuit 202 and voltage follower circuit 203, the control chip MCU have the first I/O mouths I/O1, the 2nd I/O mouths I/
O2 and AD detection mouths AD_IO, the first I/O mouths I/O1 of the control chip MCU and the input of first amplifying circuit 201
Connection, the output end of first amplifying circuit 201, the input of the voltage follower circuit 203 and two conductive spies
One in pin 100 is electrically connected to each other, and the output end of the voltage follower circuit 203 is connected with the AD detection mouths AD_IO；Institute
The 2nd I/O mouths I/O2 for stating control chip MCU is connected with the input of second amplifying circuit 202, the second amplification electricity
The output end on road 202 electrically connects with another in two conducting probes 100.Wherein, J1 and J2 is connection two in Fig. 2
The interface of probe 100.
Specifically, the control chip MCU, for exporting pwm pulse signal by the first I/O mouths I/O1, through described the
The amplification of one amplifying circuit 201 is exported to one in two conducting probes 100；The control chip MCU, is additionally operable to pass through
2nd I/O mouths I/O2 exports pwm pulse signal, and output to two conductions are visited after second amplifying circuit 202 amplification
Another in pin 100.The voltage follower circuit 203, for carrying out electricity to the detection signal of two conducting probes 100
Pressure is with then output to the control chip MCU.
It is understood that the signal of control chip MCU outputs is weaker, pass through the first amplifying circuit 201 and the second amplification
After circuit 202 amplifies, strengthen driving force.Voltage follower circuit 203 carries out voltage follow to detection signal, avoids voltage from floating
It is dynamic, ensure that detection signal is stable.
In the present embodiment, first amplifying circuit 201 include the first triode Q1, first resistor R1, second resistance R2,
3rd resistor R3 and the first power supply VCC1, the first end of the first resistor R1 connect with the first power supply VCC1
Connect, the second end of the first resistor R1 interconnects with the first end of the second resistance R2 and the first I/O mouths I/O1, institute
The second end for stating second resistance R2 is connected with the base stage of the first triode Q1, and the emitter stage of the first triode Q1 connects
Ground, the colelctor electrode of the first triode Q1 are connected through the 3rd resistor R3 with the first power supply VCC1, and described
The output end of extremely described first amplifying circuit 201 of one triode Q1 current collection.Wherein, control chip MCU passes through the first I/O mouths
The pulse signal of I/O1 outputs is exported after the first triode Q1 amplifications by its colelctor electrode.
In the present embodiment, second amplifying circuit 202 include the second triode Q2, the 5th resistance R5, the 6th resistance R6,
7th resistance R7 and the second power supply VCC2, the first end of the 5th resistance R5 connect with the second power supply VCC2
Connect, the second end of the 5th resistance R5 interconnects with the first end of the 6th resistance R6 and the 2nd I/O mouths I/O2, institute
The second end for stating the 6th resistance R6 is connected with the base stage of the second triode Q2, and the emitter stage of the second triode Q2 connects
Ground, the colelctor electrode of the second triode Q2 are connected through the 7th resistance R7 with the second power supply VCC2, and described
The output end of extremely described second amplifying circuit 202 of two triode Q2 current collection.Wherein, control chip MCU passes through the first I/O mouths
The pulse signal of I/O2 outputs is exported after the second triode Q2 amplifications by its colelctor electrode.
In the present embodiment, the voltage follower circuit 203 include the first amplifier IC1, the first electric capacity C1, the second electric capacity C2,
3rd electric capacity C3, the 4th resistance R4, the 8th resistance R8 and the 3rd power supply VCC3, the first end of the 4th resistance R4 is institute
State the input of voltage follower circuit 203, the second end of the 4th resistance R4, the first end of the first electric capacity C1 and institute
The first amplifier IC1 positive input interconnection is stated, the second end ground connection of the first electric capacity C1, the first amplifier IC1's is anti-
Interconnected to input and its output end, the power end of the first amplifier IC1 is connected with the 3rd power supply VCC3, described
First amplifier IC1 earth terminal ground connection, the first end of the second electric capacity C2 and the company of the power end of the first amplifier IC1
Connect, the second end ground connection of the second electric capacity C2；The output end of the first amplifier IC1 is through the 8th resistance R8 and described the
Three electric capacity C3 first end interconnection, and one end of the interconnection be the voltage follower circuit 203 output end, the 3rd electric capacity C3
The second end ground connection.R10 in equivalent resistance corresponding diagram 3 in Fig. 2 between 3rd resistor R3 and two conducting probes 100 and
Equivalent resistance between 3rd resistor R3 and two conducting probes 100 is formed partial pressure output by R20, i.e. control chip MCU, is changed defeated
Go out after signal follows holding by the first amplifier IC1, then filtered through the 3rd electric capacity C3, be then fed into control chip MCU AD_IO
Mouth is calculated, to calculate liquid level.3rd electric capacity C3 can use 1uF.
It should be noted that the first amplifying circuit 201, the second amplifying circuit 202 and voltage follow electricity in above-described embodiment
Road 203 does not use above-mentioned specifically circuit realiration uniquely, can according to the first amplifying circuit 201, the second amplifying circuit 202 and
The function of voltage follower circuit 203 is herein and unlimited using similar or other can realize the circuit realiration of its function and purpose
System.
The present invention also provides a kind of equipment with container, and the equipment with container includes container and liquid level emasuring device, institute
State liquid level emasuring device two conducting probes it is vertically contour be arranged in the container, and two conductions
The horizontally spaced pre-determined distance of probe.The operation principle of the structure of the liquid level emasuring device can refer to above-described embodiment,
This is repeated no more.Naturally, because the equipment with container of the present embodiment employs the technology of above-mentioned liquid level emasuring device
Scheme, therefore the equipment with container has all beneficial effects of above-mentioned liquid level emasuring device.
In one embodiment, the equipment with container is hot stove, and hot stove temperature is high, and in general measurement apparatus is intolerant to height
Temperature, if carrying out level gauging, it is necessary to carry out corresponding high-temperature-resistant structure design to hot stove, and the present invention only needs two conductions to visit
Pin stretches into hot stove water inlet can and realizes level gauging, and (hot stove would generally be destroyed using ball float without destroying hot stove structure
Structure, causes its sealing poor) or the extra high-temperature-resistant structure of design, advantage of lower cost.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (9)
1. a kind of liquid level emasuring device, it is characterised in that the liquid level emasuring device includes two conducting probes and level sensing electricity
Road, two conducting probes are parallel and relative spacing is placed in the container of liquid level to be detected, the liquid level detection circuit and two institutes
Conducting probe is stated to be electrically connected；
The liquid level detection circuit is used for output pulse signal to two conducting probes, and detects two conducting probes
Between electrical conductivity, and determine according to the electrical conductivity height of the tank fill level.
2. liquid level emasuring device as claimed in claim 1, it is characterised in that the liquid level detection circuit include control chip,
First amplifying circuit, the second amplifying circuit and voltage follower circuit, the control chip have the first I/O mouths, the 2nd I/O mouths and
AD detection mouths, the first I/O mouths of the control chip are connected with the input of first amplifying circuit, the first amplification electricity
An electricity in the output end on road, the input of the voltage follower circuit and two conducting probes is connected with each other, described
The output end of voltage follower circuit is connected with the AD detection mouths；2nd I/O mouths of the control chip and the described second amplification
The input connection of circuit, the output end of second amplifying circuit electrically connect with another in two conducting probes；
Wherein,
The control chip, it is defeated after first amplifying circuit amplification for exporting pwm pulse signal by the first I/O mouths
Go out to one in two conducting probes；The control chip, it is additionally operable to believe by exporting pwm pulse with the 2nd I/O mouths
Number, exported after second amplifying circuit amplification to another in two conducting probes；
The voltage follower circuit, for being exported after carrying out voltage follow to the detection signal of two conducting probes to described
Control chip.
3. liquid level emasuring device as claimed in claim 2, it is characterised in that first amplifying circuit includes the one or three pole
Pipe, first resistor, second resistance, 3rd resistor and the first power supply, the first end of the first resistor supply with described first
Power supply connects, and the second end of the first resistor interconnects with the first end of the second resistance and the first I/O mouths, institute
The second end for stating second resistance is connected with the base stage of first triode, and the grounded emitter of first triode is described
The colelctor electrode of first triode is connected through the 3rd resistor with first power supply, the colelctor electrode of first triode
For the output end of first amplifying circuit.
4. liquid level emasuring device as claimed in claim 2, it is characterised in that second amplifying circuit includes the two or three pole
Pipe, the 5th resistance, the 6th resistance, the 7th resistance and the second power supply, the first end of the 5th resistance supply with described second
Power supply connects, and the second end of the 5th resistance interconnects with the first end of the 6th resistance and the 2nd I/O mouths, institute
The second end for stating the 6th resistance is connected with the base stage of second triode, the grounded emitter of second triode, described
The colelctor electrode of second triode is connected through the 7th resistance with second power supply, the colelctor electrode of second triode
For the output end of second amplifying circuit.
5. liquid level emasuring device as claimed in claim 2, it is characterised in that the voltage follower circuit include the first amplifier,
First electric capacity, the second electric capacity, the 3rd electric capacity, the 4th resistance, the 8th resistance and the 3rd power supply, the first of the 4th resistance
Hold as the input of the voltage follower circuit, the second end of the 4th resistance, the first end of first electric capacity and institute
State the positive input interconnection of the first amplifier, the second end ground connection of first electric capacity, the reverse input end of first amplifier
Interconnected with its output end, the power end of first amplifier is connected with the 3rd power supply, the ground connection of first amplifier
End ground connection, the first end of second electric capacity and the connection of the power end of first amplifier, the second end of second electric capacity
Ground connection；First end of the output end of first amplifier through the 8th resistance and the 3rd electric capacity interconnects, and the interconnection
One end is the output end of the voltage follower circuit, and the second end of the 3rd electric capacity is grounded.
6. the liquid level emasuring device as described in claim 1 to 5 any one, it is characterised in that the liquid level detection circuit leads to
Connecting wire is crossed to electrically connect with two conducting probes respectively.
7. the liquid level emasuring device as described in claim 1 to 5 any one, it is characterised in that two conducting probes are equal
In cylinder, and both length are identical with cross-sectional diameter.
A kind of 8. equipment with container, it is characterised in that the liquid level including container and as described in claim 1 to 7 any one
Measurement apparatus, two conducting probes of the liquid level emasuring device are vertically contour to be arranged in the container, and
Two horizontally spaced pre-determined distances of conducting probe.
9. the equipment with container as claimed in claim 8, it is characterised in that the equipment with container is hot stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711165374.9A CN107747990A (en) | 2017-11-20 | 2017-11-20 | Liquid level emasuring device and the equipment with container |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711165374.9A CN107747990A (en) | 2017-11-20 | 2017-11-20 | Liquid level emasuring device and the equipment with container |
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| CN201711165374.9A Pending CN107747990A (en) | 2017-11-20 | 2017-11-20 | Liquid level emasuring device and the equipment with container |
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| CN109282871A (en) * | 2018-11-29 | 2019-01-29 | 成都文博蓉耀科技有限公司 | A kind of water level monitoring device of the hydraulic engineering with auto-alarm function |
| CN110346015A (en) * | 2019-08-05 | 2019-10-18 | 杭州微联智控科技有限公司 | Electric pole type water logging detection circuit and water sensor |
| CN110487353A (en) * | 2019-08-07 | 2019-11-22 | 青岛海信电子设备股份有限公司 | A kind of liquid level detection system |
| CN110346015B (en) * | 2019-08-05 | 2024-05-28 | 杭州微联智控科技有限公司 | Electrode type water immersion detection circuit and water immersion sensor |
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| CN109282871A (en) * | 2018-11-29 | 2019-01-29 | 成都文博蓉耀科技有限公司 | A kind of water level monitoring device of the hydraulic engineering with auto-alarm function |
| CN109282871B (en) * | 2018-11-29 | 2020-12-04 | 安徽中梓实业发展有限公司 | Hydraulic engineering is with water level monitoring device who has automatic alarm function |
| CN110346015A (en) * | 2019-08-05 | 2019-10-18 | 杭州微联智控科技有限公司 | Electric pole type water logging detection circuit and water sensor |
| CN110346015B (en) * | 2019-08-05 | 2024-05-28 | 杭州微联智控科技有限公司 | Electrode type water immersion detection circuit and water immersion sensor |
| CN110487353A (en) * | 2019-08-07 | 2019-11-22 | 青岛海信电子设备股份有限公司 | A kind of liquid level detection system |
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