CN205843762U - Contactless liquid level sensor - Google Patents
Contactless liquid level sensor Download PDFInfo
- Publication number
- CN205843762U CN205843762U CN201620729164.2U CN201620729164U CN205843762U CN 205843762 U CN205843762 U CN 205843762U CN 201620729164 U CN201620729164 U CN 201620729164U CN 205843762 U CN205843762 U CN 205843762U
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- China
- Prior art keywords
- liquid level
- electrode
- storage container
- level sensor
- liquid storage
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model discloses a kind of contactless liquid level sensor, it is arranged at the electrode group of liquid storage container outer wall including at least one pair of, electrode group includes that two are close to liquid storage container outer wall and along the spaced electrode of liquid storage container outer wall, electrode is conductor and electrically connects with circuit board, circuit board applies a pulsed direct current to two electrodes of every pair of electrodes group, and by detecting the electric capacity of every pair of electrodes group discharge time.This contactless liquid level sensor is difficult to breed bacteria and corrosion and ageing, may replace traditional metal probe and floating ball sensor, and need not directly contact and simple installation with liquid, it is to avoid corrosion and ageing, increases the service life.
Description
Technical field
This utility model relates to sensor, particularly to a kind of contactless liquid level sensor.
Background technology
The liquid level sensor of the detection carrying out liquid level typically has float-ball type sensor and metal probe formula sensor.Float-ball type
Sensor utilizes the movement of the float moved up and down according to wanting the displacement of liquid level measured to make rotatably to be installed on
The circular magnet of sensor housing rotates, and utilizes the testing circuit being arranged in sensor shell body to detect the week at magnet
Enclose the change of the magnetic flux density of generation.This liquid level sensor depends on the movement of float, and sensitivity is the highest, and installs
Mode and setting angle are the most limited.Metal probe formula sensor is to can be used for perception water level or the resistance of liquid surface change
Formula level sensor, by the multiple resistance being serially connected and the probe of extraction thereof, or by resistance continuous distribution resistor rod (bar,
Pipe) or outside insulated plastic charge bar be wound around resistance wire make.Have partially electronically conductive by device built-in resistor with surveyed liquid
The principle of characteristic realizes, and the all-in resistance of sensor and sensor submerge in water or the degree of depth in liquid has good linear pass
System, i.e. can obtain sensor by the resistance value measuring sensor and submerge in water or depth value in liquid.
But, either float-ball type sensor or metal probe formula sensor, it is required for directly contacting with liquid, a side
Face is difficult to install, and easy corrosion and ageing, service life is short；On the other hand, insert the easy breed bacteria of part in liquid, uncomfortable
It is combined in insulating pot or water dispenser etc. to be directly produced in the equipment of drinking water.
Utility model content
The purpose of this utility model is to provide a kind of contactless liquid level sensor.
According to an aspect of the present utility model, it is provided that a kind of contactless liquid level sensor, set including at least one pair of
Being placed in the electrode group of liquid storage container outer wall, electrode group includes that two are close to liquid storage container outer wall and are spaced along liquid storage container outer wall
The electrode arranged, electrode is conductor and electrically connects with circuit board, and circuit board applies one to two electrodes of every pair of electrodes group
Pulse current, and by detecting the electric capacity of every pair of electrodes group discharge time.
Using the contactless liquid level sensor of above technical scheme, every pair of electrodes group is actual constitutes one with liquid storage container
Individual electric capacity.Circuit board applies the pulsed direct current of to every pair of electrodes group, and two electrodes have electric potential difference, thus two
A stable electric field is defined between individual electrode.Energising and the off-position of pulsed direct current alternate.In "on" position
Time, owing to electric capacity has the characteristic every straight-through friendship, actually electric capacity is charged.When "on" position, electric capacity discharges, this
Time can judge capacitance by the discharge time of electric capacity.When liquid storage container is empty, its inner space is full of air.Air structure
Become the electrolyte of electric capacity, now can record a basic capacitance C0.When there is liquid in liquid storage container, liquid can be with structure
Become a part of electrolyte of electric capacity, now can record a capacitance C1.Owing to the dielectric constant of liquid-to-air is different, because of
This C1And C0Also differing, both subtract each other, and obtain capacitive differential Δ C, Δ C=C1-C0, it is hereby achieved that liquid in liquid storage container
The liquid level of body.
In some embodiments, including pair of electrodes group, two electrodes are identical, and electrode is oppositely disposed in liquid storage
Container outer wall both sides.
In some embodiments, electrode is soft electric conductor.Thus electrode can carry out moulding so that it is with liquid storage container
Outer wall laminating is tightr.
In some embodiments, electrode is FPC, soft copper plate or conductive rubber.
In some embodiments, liquid storage container is glass container, ceramic vessel or plastic containers.
In some embodiments, electrode is fitted completely with liquid storage container.
Electrode is one-body molded with liquid storage container.
In some embodiments, electrode is by extending to top bottom liquid storage container.In capacitive differential Δ C and liquid storage container
The liquid level of liquid is the most linear, thus can monitor liquid level in real time.
In some embodiments, electrode is arranged at the position that liquid storage container warning liquid level is corresponding.Warning liquid level includes
High warning liquid level and minimum warning liquid level.In actual applications, can select as required in the highest warning liquid level or minimum
Warning liquid level arranges pair of electrodes group, or arranges pair of electrodes group in the highest warning liquid level and minimum warning liquid level respectively.?
The high capacitive differential guarding against level electrode group corresponding with minimum warning level electrode group is respectively Δ Ca and Δ Cb.When Δ C ＜ Δ
During Cb or Δ C ＞ Δ Ca, can report to the police with Triggering Control System or take other actions.
The contactless liquid level sensor that this utility model provides is difficult to breed bacteria and corrosion and ageing, may replace traditional
Metal probe and floating ball sensor, and need not directly contact and simple installation with liquid, it is to avoid corrosion and ageing, prolongation makes
Use the life-span.
This contactless liquid level sensor can extensively should apply to machinery, chemical industry, papermaking, light industry, sanitary bath equipment, household electrical appliances
The pond in field, water tower, water pipe, water tank, medical device, the surfings such as product, industry control, drinking equipment, Food Machinery, medical device
In the products such as bathtub, toilet, coffee machine, water dispenser.
This contactless liquid level sensor also has an effect of following excellence:
(1) electromagnetic field principle is used, ultra-high stable, the most affected by environment；
(2) high inspiration degree, can run through the container of any non-metallic material, such as glass, pottery, plastics etc., it is achieved
Real untouchable detection；
(3) liquid, oil all can detect；
(4) unipolar sensing, not by periphery Instrumental effects, be suitable for complex environment use；
(5) liquid level and the square-compact cabinet of flow-control in soft/hard tube it are particularly well-suited to, low-profile
Feature, scalable sensitivity；
(6) installation and debugging are very easy to, immediately available；
(7) full automatic balance technology, sensitivity is neat, produces most convenient.
Accompanying drawing explanation
Fig. 1 is the structural representation of the contactless liquid level sensor of a kind of embodiment of this utility model.
Fig. 2 is the scheme of installation of electrode group shown in Fig. 1.
Fig. 3 is the schematic diagram of contactless liquid level sensor shown in Fig. 1.
Fig. 4 is the structural representation of the contactless liquid level sensor of this utility model another embodiment.
Fig. 5 is the schematic diagram of contactless liquid level sensor shown in Fig. 4.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described in further detail.
Embodiment 1
Fig. 1 to Fig. 3 show schematically show the non-contact level sensing according to a kind of embodiment of the present utility model
Device.As it can be seen, this device to be installed on housing 3 internal, including the electrode group 1 being arranged at liquid storage container 4 outer wall for a pair.Electrode group
1 includes two electrodes 11 being close to liquid storage container 4 outer wall.Electrode 11 for conductor and electrically connects with circuit board 2.
Wherein, liquid storage container 4 is glass container.Electrode 11 is fitted completely with liquid storage container 4.
Two electrodes 11 are identical.Electrode 11 is oppositely disposed in liquid storage container 4 outer wall both sides.
Electrode 11 is extended to top by bottom liquid storage container 4.
Circuit board 2 applies the pulsed DC signal of a 6V to two electrodes 11 of electrode group 1, and detecting electrode group 1
Electric capacity.
In the present embodiment, electrode 11 is the soft electric conductor of soft copper plate.Thus electrode 11 can carry out moulding so that it is with storage
The laminating of liquid container 4 outer wall is tightr.
In other examples, electrode 11 can also be the soft electric conductor such as FPC or conductive rubber.
In other examples, liquid storage container 4 can also be ceramic vessel or plastic containers etc..
In the other embodiment of some, electrode 11 can also be one-body molded with liquid storage container 4.
Using the contactless liquid level sensor of above technical scheme, electrode group 1 is actual constitutes an electricity with liquid storage container 4
Hold.Circuit board 2 applies the pulsed dc voltage an of-6V to electrode group 1, and two electrodes 11 have electric potential difference, thus at two
A stable electric field is defined between electrode 11.Energising and the off-position of pulsed direct current alternate.In "on" position
Time, owing to electric capacity has the characteristic every straight-through friendship, actually electric capacity is charged.When "on" position, electric capacity discharges, this
Time can judge capacitance by the discharge time of electric capacity.When liquid storage container 4 is empty, its inner space is full of air.Air
Constitute the electrolyte of electric capacity, now can record a basic capacitance C0.When there is liquid in liquid storage container 4, liquid can
To constitute a part of electrolyte of electric capacity, a capacitance C now can be recorded1.Due to liquid-to-air dielectric constant not
With, therefore C1And C0Also differing, both subtract each other, and obtain capacitive differential Δ C, Δ C=C1-C0, it is hereby achieved that liquid storage container
The liquid level of liquid in 4.Capacitive differential Δ C is the most linear with the liquid level of liquid in liquid storage container 4, thus can supervise in real time
Survey liquid level.
The contactless liquid level sensor that this utility model provides is difficult to breed bacteria and corrosion and ageing, may replace traditional
Metal probe and floating ball sensor, and need not directly contact and simple installation with liquid, it is to avoid corrosion and ageing, prolongation makes
Use the life-span.
Embodiment 2
Fig. 4 and Fig. 5 show schematically show the contact-free level according to another embodiment of the present utility model and pass
Sensor.As it can be seen, be, in the highest warning liquid level and the minimum warning liquid level of liquid storage container 4 with the difference of embodiment 1
It is respectively arranged with pair of electrodes group 1.The highest warning level electrode group capacitive differential corresponding with minimum warning level electrode group divides
Wei Δ Ca and Δ Cb.As Δ C ＜ Δ Cb or Δ C ＞ Δ Ca, can report to the police with Triggering Control System or take other to move
Make.
In other examples, it is also possible to select as required to arrange in the highest warning liquid level or minimum warning liquid level
Pair of electrodes group 1.
Above-described is only embodiments more of the present utility model.For the person of ordinary skill of the art,
On the premise of creating design without departing from this utility model, it is also possible to making some deformation and improvement, these broadly fall into this practicality
Novel protection domain.
Claims (9)
1. contactless liquid level sensor, it is characterised in that include that at least one pair of is arranged at the electrode group of liquid storage container outer wall, institute
State electrode group and include that two are close to described liquid storage container outer wall and along the described spaced electrode of liquid storage container outer wall, described
Electrode is conductor and electrically connects with circuit board, and described circuit board applies a pulse direct current to two electrodes of every pair of electrodes group
Electric current, and by detecting the electric capacity of every pair of electrodes group discharge time.
Contactless liquid level sensor the most according to claim 1, it is characterised in that include pair of electrodes group, two institutes
Stating electrode identical, described electrode is oppositely disposed in described liquid storage container outer wall both sides.
Contactless liquid level sensor the most according to claim 1 and 2, it is characterised in that described electrode is soft conduction
Body.
Contactless liquid level sensor the most according to claim 3, it is characterised in that described electrode be FPC,
Soft copper plate or conductive rubber.
Contactless liquid level sensor the most according to claim 1 and 2, it is characterised in that described liquid storage container is glass
Container, ceramic vessel or plastic containers.
Contactless liquid level sensor the most according to claim 1, it is characterised in that described electrode and described liquid storage container
Fit completely.
Contactless liquid level sensor the most according to claim 1, it is characterised in that described electrode and described liquid storage container
One-body molded.
Contactless liquid level sensor the most according to claim 1, it is characterised in that described electrode is by described liquid storage container
Bottom extends to top.
Contactless liquid level sensor the most according to claim 1, it is characterised in that described electrode is arranged at described liquid storage
The position that container warning liquid level is corresponding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620729164.2U CN205843762U (en) | 2016-07-01 | 2016-07-01 | Contactless liquid level sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620729164.2U CN205843762U (en) | 2016-07-01 | 2016-07-01 | Contactless liquid level sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205843762U true CN205843762U (en) | 2016-12-28 |
Family
ID=57620207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620729164.2U Expired - Fee Related CN205843762U (en) | 2016-07-01 | 2016-07-01 | Contactless liquid level sensor |
Country Status (1)
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| CN (1) | CN205843762U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106592188A (en) * | 2016-12-30 | 2017-04-26 | 东保集团有限公司 | Steam ironing device and evaporator thereof |
| CN108332819A (en) * | 2018-02-27 | 2018-07-27 | 南京诺尔曼生物技术有限公司 | The method of liquid level in liquid storage detection structure, device and detection liquid storage bottle |
| CN111481057A (en) * | 2020-04-13 | 2020-08-04 | 山东普勒控股集团有限公司 | Full-automatic water-full automatic stop clamping arm type water taking terminal |
| CN112378964A (en) * | 2020-11-13 | 2021-02-19 | 苏州森斯微电子技术有限公司 | Method for non-invasively measuring LPG residual quantity of FRP container |
-
2016
- 2016-07-01 CN CN201620729164.2U patent/CN205843762U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106592188A (en) * | 2016-12-30 | 2017-04-26 | 东保集团有限公司 | Steam ironing device and evaporator thereof |
| CN106592188B (en) * | 2016-12-30 | 2019-11-15 | 东保集团有限公司 | Steam ironing apparatus and its evaporator |
| CN108332819A (en) * | 2018-02-27 | 2018-07-27 | 南京诺尔曼生物技术有限公司 | The method of liquid level in liquid storage detection structure, device and detection liquid storage bottle |
| CN111481057A (en) * | 2020-04-13 | 2020-08-04 | 山东普勒控股集团有限公司 | Full-automatic water-full automatic stop clamping arm type water taking terminal |
| CN112378964A (en) * | 2020-11-13 | 2021-02-19 | 苏州森斯微电子技术有限公司 | Method for non-invasively measuring LPG residual quantity of FRP container |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161228 Termination date: 20200701 |