CN208847287U - Condenser type adaptive universal liquid level emasuring device - Google Patents
Condenser type adaptive universal liquid level emasuring device Download PDFInfo
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- CN208847287U CN208847287U CN201821372510.1U CN201821372510U CN208847287U CN 208847287 U CN208847287 U CN 208847287U CN 201821372510 U CN201821372510 U CN 201821372510U CN 208847287 U CN208847287 U CN 208847287U
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Abstract
The utility model discloses a kind of condenser type adaptive universal liquid level emasuring devices, it include: capacitive sensor modules, including liquid level sensor, first environment sensor and liquid sensor, the capacitance of the liquid level sensor acquisition reflection liquid level variation, the first environment sensor acquires the capacitance of its local environment no liquid state, and the liquid sensor measures its position by the capacitance under liquid-immersed state；Conversion module is connect with the capacitive sensor modules, and the capacitance that capacitive sensor modules acquire is converted to frequency signal and numeral output；Data collection and processing module are connect with the output end of the conversion module, by data processing that the conversion module exports and obtain liquid level；Power module is above-mentioned capacitive sensor modules, conversion module, data collection and processing module power supply.The utility model overcomes the defect of existing liquid level sensor, and the precision of level gauging is higher, safer, versatility is more preferable.
Description
Technical field
The utility model relates to level gauging fields, and in particular to a kind of condenser type adaptive universal liquid level emasuring device.
Background technique
Level measuring technology has extremely wide application in industrial circle, need to only obtain the surface of material under normal circumstances
Position is recorded and is stored；With the raising of production automation degree, carried out under the premise of liquid level data measurement control with
It adjusts, to guarantee that automated production can be controlled automatically at optimum state；In the enterprise production process of modernization, computer is used
It is becoming increasingly popular in central production control unit, people use computer control system to carry out various comprehensively controls and pipe to production
Reason, so level measuring technology is also put forward higher requirements therewith, it is desirable that measurement object is wide, precision is high, good reliability, to measurement
Environmental requirement is low, practical etc..
There are many level measuring methods at present, comprising:
● magnetic float: magnet is mounted on one with tank fill level variation and on mobile float, and the body of rod can be inspired
" reed switch " of middle sealing.This solution has very high repeatability, but due to the mobility of magnetic float,
Service life is shorter, and reliability is relatively low.
● supersonic sensing: prolonging between the ultrasonic signal of sensor transmissions to liquid surface and the echo-signal of reflection
It is converted into the liquid level of associated vessel late.The maximum level that such system can detect depends on the structure of transceiver.Measure meeting
It is influenced by the variation of the environmental factors such as temperature, pressure and humidity.
● conduction measurement: such equipment measures conductibility by two conductive electrodes.This method is more more reliable than first two,
But it is not used to flammable liquid.
Obviously, manufacturer needs more powerful, more reliable, the more accurate and wider level measuring technology of purposes.Capacitor sense
Technology is answered to can satisfy these demands.It does not use any moving component, can be safely used for combustible material, and will not be easily
It is influenced by environmental change.
Capacitance sensing technology is one of reliable method of level monitoring.It is generally used for the capacitance type liquid level of measurement conducting liquid
The electric conductivity that sensor utilizes liquid itself to have, constitutes a simulated capacitance pole plate, is formed between measuring pad with liquid
The capacitor that position changes is carried out capacitance-frequency conversion (C-F conversion) using circuit resonance principle, measures capacitance, recycles quilt
The conductivity for surveying the substance of object, a kind of liquid level emasuring device that liquid level variation is converted into electrostatic capacitance change to measure.But
It is that there is certain limitation, the change of the dielectric constant induced is changed to conducting medium, concentration of medium and resisting medium easily produces
Raw bridging phenomenon etc. is more sensitive, is easy to produce biggish measurement error.
Utility model content
The utility model aim is: providing a kind of condenser type adaptive universal liquid level emasuring device, existing liquid level is overcome to pass
The defect of sensor realizes that the precision of level gauging is higher, safer, the better purpose of versatility.
The technical solution of the utility model is: a kind of condenser type adaptive universal liquid level emasuring device, comprising:
Capacitive sensor modules, including be set in fluid to be measured liquid level sensor, be set on fluid to be measured liquid level
The first environment sensor of side and the liquid sensor being set to below the normal minimum level of fluid to be measured, the liquid level sensor
The capacitance of acquisition reflection liquid level variation, the first environment sensor acquire the capacitance of its local environment no liquid state,
The liquid sensor measures its position by the capacitance under liquid-immersed state；
Conversion module is connect with the capacitive sensor modules, and the capacitance that capacitive sensor modules acquire is converted to
Frequency signal and numeral output；
Data collection and processing module are connect with the output end of the conversion module, the number that the conversion module is exported
According to handling and obtain the liquid level of fluid to be measured；
Power module is above-mentioned capacitive sensor modules, conversion module, data collection and processing module power supply.
In one embodiment, further include second environment sensor, be set to first environment on container inner height direction and pass
Between sensor and liquid sensor, the capacitance of its position is measured.
In one embodiment, the capacitive sensor modules further include fixed shell, solid vertically in the set casing body
Surely it is provided with measuring pad and with reference to pole plate, and reference pole plate is parallel and spacing is fixed, the fixed shell for the measuring pad
All-pass cavity between being equipped with perforative pole plate, the liquid level sensor, environmental sensor and liquid are above installed corresponding to pole plate meta position
Sensor distribution is arranged on the intracorporal two pieces of pole plates of the set casing, and the measurement pole of each sensor is located at measuring pad
On, it is located at reference to pole with reference on pole plate.
In one embodiment, on the measuring pad, liquid level sensor is strip and is arranged and left side that right side is from upper
First environment sensor, second environment sensor and liquid level sensor, the liquid level sensor, first environment are set gradually under
Sensor, second environment sensor and liquid level sensor draw signal wire respectively and access the conversion module, described to refer to pole plate
It connect for one piece of whole electrode and with conversion module.
In one embodiment, further include display module, connect with the data collection and processing module, show test solution
The liquid level of body.
In one embodiment, the data collection and processing module are specially single-chip microcontroller.
The utility model has the advantages that: the utility model is guaranteed spacing fixed between measuring pad by structure, guarantees zero
The stability of position capacitor and liquid level measured capacitance value, to guarantee the precision and consistency of level gauging；Polar board surface and tested
Liquid is electrically isolated completely to, and is powered using ultra low voltage super low-power consumption, and intrinsic safety can be achieved under detonation environment；Together
When have detected environment (generally air), measured matter, therefore its level gauging is unrelated with measured medium, has automatic adapt to
Property；Pole plate is referred to using included, and is fixed cavity structure between pole plate, conducting liquid or non-conductive liquid can be generally applicable to
Body；Second environmental sensor introduced can be special circumstances (including but not limited to: no liquid, spill-over, sensor fault)
The validity of lower confirmation measured value, only as two in three readings from two environmental sensors and a liquid sensor
When a almost the same, measurement process is only normal operating conditions, otherwise needs to carry out abnormality processing.The present apparatus is by collected liquid
Position variation successively shows its liquid level after sensor module, CF conversion module, data processing module on the display module,
Increase visual.
Detailed description of the invention
The utility model is further described with reference to the accompanying drawings and embodiments:
Fig. 1 is the structural block diagram of the condenser type adaptive universal liquid level emasuring device of the utility model embodiment；
Fig. 2 is the schematic diagram of the condenser type adaptive universal liquid level emasuring device of the utility model embodiment；
Fig. 3 is the capacitive sensor modules of the condenser type adaptive universal liquid level emasuring device of the utility model embodiment
Structural schematic diagram；
Fig. 4 is schematic layout pattern of the capacitance sensor of the utility model embodiment on pole plate；
Fig. 5 is the flow chart of the condenser type adaptive universal level measuring method of the utility model embodiment.
Specific embodiment
The principles of the present invention and feature are described below in conjunction with attached drawing, example is served only for explaining that this is practical
It is novel, it is not intended to limit the scope of the utility model.
A kind of condenser type adaptive universal liquid level emasuring device as shown in Figure 1, including capacitive sensor modules, modulus of conversion
Block, data collection and processing module and power module, the capacitive sensor modules, including the liquid level being set in fluid to be measured
It sensor, the first environment sensor for being set to fluid to be measured ullage and is set to below the normal minimum level of fluid to be measured
Liquid sensor, the capacitance of liquid level sensor acquisition reflection liquid level variation, the first environment sensor acquires it
The capacitance of local environment no liquid state, the liquid sensor measure its position by the capacitor under liquid-immersed state
Value, this programme has detected environment (generally air), measured matter simultaneously, therefore its level gauging is unrelated with measured medium, tool
There is automatic adaptability；The FDC2114/2214 capacitive digital converter IC of TI company can be used in the conversion module, and described
The capacitance that capacitive sensor modules acquire is converted to frequency signal and numeral output by capacitive sensor modules connection；It is described
Data collection and processing module can realize, preferred single-chip microcontroller using single-chip microcontroller, PLC, computer, the conversion module it is defeated
Outlet is connected by I2C bus with single-chip microcontroller, and single-chip microcontroller is by the data processing that the conversion module exports and obtains fluid to be measured
Liquid level；The power module is that above-mentioned capacitive sensor modules, conversion module, data collection and processing module are powered,
3.3V DC voltage is provided, using power supply adaptor and dry cell power supply two ways, the liquid level emasuring device can also be wrapped
Display module is included, LCD MODULE is connected by spi bus with single-chip microcontroller, shows the liquid level of fluid to be measured, increase can
Depending on property.
In one embodiment, further include second environment sensor, be set to first environment on container inner height direction and pass
Between sensor and liquid sensor, the capacitance of its position is measured.The second environment sensor of introducing can be in special feelings
The validity of measured value is confirmed under condition (including but not limited to: no liquid, spill-over, sensor fault).
In one specific embodiment of above-described embodiment, the capacitor of the condenser type adaptive universal liquid level emasuring device
Sensor module structure is fixedly installed measuring pad 1 in the fixed shell 4 as shown in figure 3, including fixed shell 4 vertically
With reference pole plate 2, device fixes two pieces of pole plates using shell, and shell structure guarantees that interval holding determines between two pieces of pole plates, institute
It is parallel and spacing is fixed with reference to pole plate 2 to state measuring pad 1, installs to be equipped with corresponding to pole plate meta position on the fixed shell 4 and pass through
All-pass cavity 3 between the pole plate worn, all-pass cavity electric insulation, described two pole plates and fluid to be measured electric insulation, shell can be with
Ground connection improves anti-interference when needing.Measuring pad 1 and reference pole plate 2 can be pcb board, together with fixing shell 4 and doing, tightly
Close connection, insulation processing is done on surface when necessary.Here there are two types of situations: if pcb board has the side of metal to be wrapped up by shell,
It will not contact and insulate with liquid；If the side that pcb board has metal side to contact towards all-pass cavity 3, pcb board with liquid
Insulation processing is done on surface, is such as coated the insulating materials of glass glaze etc, is accomplished electric insulation.The opening at 3 both ends of all-pass cavity needs
Strainer can be installed when wanting additional prevents foreign matter from entering, and the all-pass cavity when in use protect by liquid position therein and tested liquid level
Hold consistent, sensor body is placed in inside tested container, between pole plate cavity structure lower openings for fluid to be measured flow into
Outflow, upper opening are then the disengaging for balancing environmental gas.Strainer appropriate, which can be set, in two openings prevents foreign matter from entering
Measure cavity.The liquid level sensor, environmental sensor and liquid sensor are distributed two pieces be arranged in the fixed shell 4
On pole plate, the measurement pole of each sensor is located on measuring pad 1, is located at reference to pole with reference on pole plate 2.The utility model
Guarantee spacing fixed between measuring pad by structure, guarantees the stability of zero-bit capacitor and liquid level measured capacitance value, to protect
The precision and consistency of level gauging are demonstrate,proved, polar board surface is electrically isolated completely to fluid to be measured, and ultralow using ultra low voltage
Power consumption power supply, can be achieved intrinsic safety under detonation environment.In addition, this programme, which uses to carry, refers to pole plate, and between pole plate
For fixed cavity structure, conducting liquid or non-conductive liquid can be generally applicable to.
It is further preferred that on the measuring pad, liquid level sensor is strip and is arranged and left side above-described embodiment,
Right side sets gradually first environment sensor, second environment sensor and liquid level sensor from top to bottom, the liquid level sensor,
First environment sensor, second environment sensor and liquid level sensor draw signal wire respectively and access the conversion module, described
It is one piece of whole electrode with reference to pole plate and is connect with conversion module.As shown in figure 4, (a) is in two pieces of pole plates device shown in Fig. 3
Pose pattern, be (b) measuring pad, there is four pieces of electrodes above, left side strip is level sensor, the right it is upper
Two pieces of face electrode is environmental sensor 1 and environmental sensor 2, and environmental sensor 1 is first environment sensor, environmental sensor 2
That is second environment sensor, nethermost one piece of electrode are liquid level sensor, and it is subsequent to draw signal access from this four pieces of electrodes
C-F module draws as with reference to ground (c) with reference to pole plate, to there is one piece of electrode above, equally accesses subsequent C-F module, join
See Fig. 2 and Fig. 5, the utility model embodiment also provides a kind of condenser type adaptive universal level measuring method, liquid level sensor
The capacitance of acquisition reflection liquid level variation, first environment sensor acquire the capacitance of its local environment no liquid state, liquid
Sensor measures the capacitance being totally submerged under state by liquid；Capacitive sensor modules are by collected signal input capacitance frequency
Rate (CF) conversion module, using circuit resonance principle, to obtain Cf、Ce、Cl、C0Value, these data are read by single-chip microcontroller, root
According to formula
Liquid level is calculated, and shows measurement result on the display module.Wherein, CeIt is measured for first environment sensor
Its position no liquid state capacitance, CfIts position is measured by under liquid-immersed state for liquid sensor
Capacitance, ClThen the capacitance under current level, C are measured for liquid level sensor0It is liquid level sensor initial when liquid level is zero
Capacitance, as shown in figure 4, hrFor the minimum constructive height unit for measuring level gauging in the container, it is liquid capacitance sensor
Pole plate height.
In the formula for calculating liquid level, C is usedf-CeAs denominator, it is empty for vessel liquid or is full etc. special
Situation is likely to occur the case where denominator is zero and causes not judging.To improve Measurement reliability, as shown in Figure 2 second is set
Environmental sensor is placed in the position of some height between liquid in containers sensor and first environment sensor.They will be produced
Raw three measurement data, under normal circumstances, the two in three be it is almost the same, judge that system is normal.The special case of small probability
It is the processing that liquid level is placed exactly in second environment sensor present position: occurs two environmental sensors and liquid sensor at this time
The case where three readings arrange from small to large；Liquid level is acquired using normal measurement process at this time, further compares measurement liquid
Position unanimously then determines normal measurement, is not so judged as the system failure compared with the second sensor position as known to structure.And it mentions
Show that measurement abnormal such as empty van, spill-over or sensor fault are abnormal.It is according to two environmental sensors and one in processing links
The reference capacitance Value Data of a liquid sensor is judged.
The above embodiments are only for explaining the technical ideas and features of the present invention, and its object is to allow be familiar with technique
People can understand the content of the utility model and implement accordingly, do not limit the protection scope of the present invention.It is all
According to the modification that the Spirit Essence of the utility model main technical schemes is done, should all cover in the protection scope of the utility model
Within.
Claims (6)
1. a kind of condenser type adaptive universal liquid level emasuring device characterized by comprising
Capacitive sensor modules, including be set in fluid to be measured liquid level sensor, be set to fluid to be measured ullage
First environment sensor and the liquid sensor being set to below the normal minimum level of fluid to be measured, the liquid level sensor acquisition
Reflect the capacitance of liquid level variation, the first environment sensor acquires the capacitance of its local environment no liquid state, described
Liquid sensor measures its position by the capacitance under liquid-immersed state；
Conversion module is connect with the capacitive sensor modules, and the capacitance that capacitive sensor modules acquire is converted to frequency
Signal and numeral output；
Data collection and processing module are connect with the output end of the conversion module, at the data that the conversion module is exported
It manages and obtains the liquid level of fluid to be measured；
Power module is above-mentioned capacitive sensor modules, conversion module, data collection and processing module power supply.
2. condenser type adaptive universal liquid level emasuring device as described in claim 1, which is characterized in that further include that second environment passes
Sensor is set on container inner height direction between first environment sensor and liquid sensor, measures the electricity of its position
Capacitance.
3. condenser type adaptive universal liquid level emasuring device as claimed in claim 2, which is characterized in that the capacitance sensor mould
Block further includes fixed shell, is fixedly installed measuring pad in the set casing body vertically and with reference to pole plate, the measuring pad
Parallel and spacing is fixed with reference pole plate, on the fixed shell correspond to pole plate meta position install be equipped with perforative pole plate between all-pass
Cavity, the liquid level sensor, environmental sensor and liquid sensor distribution are arranged in the intracorporal two pieces of pole plates of the set casing
On, the measurement pole of each sensor is located on measuring pad, is located at reference to pole with reference on pole plate.
4. condenser type adaptive universal liquid level emasuring device as claimed in claim 3, which is characterized in that on the measuring pad,
Liquid level sensor is strip and is set to left or right side, and the other side sets gradually first environment sensor, the from top to bottom
Two environmental sensors and liquid level sensor, the liquid level sensor, first environment sensor, second environment sensor and liquid level pass
Sensor draws signal wire respectively and accesses the conversion module, described to be one piece of whole electrode with reference to pole plate and connect with conversion module.
5. condenser type adaptive universal liquid level emasuring device as described in claim 1, which is characterized in that it further include display module,
It is connect with the data collection and processing module, shows the liquid level of fluid to be measured.
6. condenser type adaptive universal liquid level emasuring device as described in claim 1, which is characterized in that the data collection and place
Managing module is specially single-chip microcontroller.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108871498A (en) * | 2018-08-24 | 2018-11-23 | 苏州大学 | Condenser type adaptive universal liquid level emasuring device and method |
| CN111830091A (en) * | 2020-06-12 | 2020-10-27 | 浙江达峰科技有限公司 | Water softener for capacitive detection of salt content and salt content detection method thereof |
-
2018
- 2018-08-24 CN CN201821372510.1U patent/CN208847287U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108871498A (en) * | 2018-08-24 | 2018-11-23 | 苏州大学 | Condenser type adaptive universal liquid level emasuring device and method |
| CN111830091A (en) * | 2020-06-12 | 2020-10-27 | 浙江达峰科技有限公司 | Water softener for capacitive detection of salt content and salt content detection method thereof |
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