CN106802176A - A kind of water level detecting system - Google Patents
A kind of water level detecting system Download PDFInfo
- Publication number
- CN106802176A CN106802176A CN201510836577.0A CN201510836577A CN106802176A CN 106802176 A CN106802176 A CN 106802176A CN 201510836577 A CN201510836577 A CN 201510836577A CN 106802176 A CN106802176 A CN 106802176A
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- pressure
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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
- G01F23/14—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 measurement of pressure
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a kind of water level detecting system, it includes：Level vessels to be measured, the liquid for storing certain volume；Conduit, its one end is connected with sealed gas chamber, and the other end is connected with the level vessels to be measured；Sealed gas chamber, its air admission hole is connected with the conduit, and the top of the sealed gas chamber is concordant with the top of the level vessels to be measured；When the water level in level vessels to be measured changes, the air pressure in sealed gas chamber can also change, and by measuring the change of air pressure in sealed gas chamber, can extrapolate the height of liquid in the level vessels to be measured；Waterproof and breathable barrier film, positioned at the interface of conduit and sealed gas chamber, can allow for gas molecule and passes through, and prevent hydrone from passing through, and to ensure the air pressure in sealed gas chamber and to lead intraductal atmospheric pressure equal, but play a part of waterproof；Pressure detecting module, is placed in sealed gas chamber, for measuring the air pressure in the sealed gas chamber.
Description
Technical field
The present invention relates to field of sensing technologies, particularly a kind of water level detecting system.
Background technology
Water level detecting system is used to measure the height of water level in container.Such as washing machine, can in water filling
To determine the height of water level in washing tub by water level detecting system.The washing machine for commonly using at present
Water level detecting system is using the structure as shown in figure Fig. 1.
With reference to Fig. 1, laundry bottom of the barrel is connected to level sensor by flexible pipe, constitutes a linker
Structure.When SEA LEVEL VARIATION in washing tub, the gas room pressure of level sensor bottom can be caused
Change, in turn results in moving up and down for diaphragm of rubber, and a magnetic core cylinder is connected on diaphragm of rubber
Body, magnetic core cylinder is positioned over a center for inductance coil.When the magnetic core cylinder is in diaphragm of rubber
Traction under when moving up and down, the inductance value L of inductance coil changes, and is vibrated by a LC
The change of frequency circuit detection resonant frequency F.Height of water level H and resonant frequency F have dullness
Functional relation, so as to realize the detection of height of water level.
But in the prior art there is following technological deficiency in level sensor：
1) individual difference is big.The relation curve of the height of water level H and resonant frequency F of each sensor
It is different from, differs greatly, causes to measure the water level error for obtaining larger.
2) height of water level and resonant frequency F are in non-linear relation.When water level is higher, diaphragm of rubber
Close to deformation critical value, deformation amplitude reduces, therefore, water level is higher, and detection error is bigger.
The content of the invention
In view of this, the present invention proposes a kind of water level detecting system, with solve level measuring error compared with
Big problem.
A kind of water level detecting system proposed by the present invention, it includes：
Level vessels to be measured, the liquid for storing certain volume；
Conduit, its one end is connected with sealed gas chamber, and the other end is connected with the level vessels to be measured；
Sealed gas chamber, its air admission hole is connected with the conduit, and the top of the sealed gas chamber is to be measured with described
The top of level vessels is concordant；When the water level in level vessels to be measured changes, in sealed gas chamber
Air pressure can also change, by measuring the change of air pressure in sealed gas chamber, can extrapolate described
The height of liquid in level vessels to be measured；
Waterproof and breathable barrier film, positioned at conduit and the interface of sealed gas chamber, can allow for gas molecule and leads to
Cross, prevent hydrone from passing through, to ensure the air pressure in sealed gas chamber and to lead intraductal atmospheric pressure equal, but
Play a part of waterproof；
Pressure detecting module, is placed in sealed gas chamber, for measuring the air pressure in the sealed gas chamber.
Above-mentioned water level detecting system proposed by the present invention compared with prior art, with advantages below：
1) baroceptor being prepared from using MEMS (mems) mass processing technology
Hydraulic pressure is detected, prior art individual difference is solved big, it is impossible to required precision etc. is met
Shortcoming；
2) by leakage measurement method using differential pressure transducer, the distinct methods such as dual sensor mensuration and dynamic zeroing method disappear
The external pressure fluctuation of influence except to(for) measured value, is obtained in that preferably measurement range and the linearity.
Brief description of the drawings
Fig. 1 is two fundamental diagrams of washing machine water position detecting system in the prior art；
Fig. 2 is the simplified model schematic diagram of level sensor in the embodiment of the present invention；
Fig. 3 is that the calculated results of the simplified model of level sensor in the embodiment of the present invention are illustrated
Figure；
Fig. 4 is the fundamental diagram of level sensor in the embodiment of the present invention；
Fig. 5 is the differential pressure measurement method schematic diagram of level sensor in first embodiment of the invention；
Fig. 6 is the differential pressure measurement method schematic diagram of level sensor in second embodiment of the invention；
Fig. 7 is the absolute pressure measuring method schematic diagram of level sensor in third embodiment of the invention；
The system block diagram of Fig. 8 absolute pressure acquisition modules.
Specific embodiment
To make the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with specific reality
Example is applied, and referring to the drawings, the present invention is described in further detail.
The present invention proposes a kind of level sensor based on pressure sensor, with simple structure, measurement
Good linearity, the advantages of uniformity is high.
Technical scheme is described in further detail below.
Water level detecting can with it is abstract as Fig. 1 shown in model.Wherein, the left side is height of water level to be detected
Testing container, y be height of water level to be measured, the right is by conduit and the testing container UNICOM
Sealed gas chamber, x is the height of water level in the sealed gas chamber, and a is the datum plane of water level, and b is right
The horizontal plane of side cavity, d is the diameter of right chamber.Air pressure P1 and air in the sealed gas chamber of the right
Pressure P0, the relation such as following formula between water column pressure Pwater：
P1=P0+Pwater=P0+Rho*g* (y-x) (1)
Wherein, Rho is the density of water, and g is acceleration of gravity.By calculate it is known that
Wherein h is the height of the right sealed gas chamber, and R is ideal gas constant, and v0 is closed gas body
Product.Fig. 3 depict above-mentioned model in the range of height of water level y=0~0.5 meter with the relation curve of P1
Figure.
Calculating shows, in 0~0.5 meter of altitude range, water level of washing machine y and sealed gas chamber air pressure P1
Between follow good linear relationship.Illustrate that calculation height of water level y can be returned by measuring P1.
Based on this, the present invention proposes a kind of water level detecting system.As shown in figure 4, the water level inspection
Examining system includes：
Level vessels to be measured 100, the container is used to store the liquid of certain volume, water of the present invention
Level sensor is used to measure the elevation of water of liquid in the level vessels to be measured.
Conduit 200, its one end is connected with sealed gas chamber, and the other end is connected with the level vessels to be measured；
The material of conduit is soft bent, can use rubber or silicone tube；The internal diameter of conduit is
In the range of 0.1~10mm.
Sealed gas chamber 301, the air admission hole 300 of the sealed gas chamber is connected with conduit 200.When water to be measured
When water level in the container of position changes, the air pressure in sealed gas chamber can also change, by measurement
Air pressure in sealed gas chamber, can extrapolate the height of water level.In general, the top of the sealed gas chamber
Portion is concordant with the top of container, and the height of its bottom is equivalent to the x in formula 1.
Waterproof and breathable barrier film 302, waterproof and breathable barrier film is located at connecing for conduit 200 and sealed gas chamber 301
At mouthful, it is a kind of macromolecule membrane, can allow for gas molecule and passes through, but hydrone can not be passed through,
Air pressure in sealed gas chamber can so be ensured and to lead intraductal atmospheric pressure equal, but play a part of waterproof.
Pressure detecting module 303, it is placed in sealed gas chamber, for measuring in the sealed gas chamber
Air pressure；
The present invention by the placement force detection module inside sealed gas chamber, by measure air pressure realize it is right
The detection of height of water level.
In first embodiment of the invention, the pressure detecting module includes differential pressure pick-up, such as Fig. 5 institutes
Show.Pressure in sealed gas chamber by height of water level in addition to being influenceed, while being also subject to outside gas
The influence of pressure.Therefore accurate measurement water level is wanted highly, it is necessary to eliminate the influence that external pressure wave zone comes.
Therefore, the pressure differential of sealed gas chamber and external environment can be measured using differential pressure pick-up.The differential pressure
Sensor may be mounted at the sealed gas chamber top.
Preferably, the differential pressure pick-up is pressure-strain film.The pressure-strain film can be metal
Foil gauge or the silicon piezoresistance type pressure-strain film using MEMS technology processing.
When internal pressure P1 and outside atmospheric pressure P0 are unequal, the pressure-strain film can be caused
The deformation of diaphragm, by measuring piezo-resistance change in resistance, can be calculated the pressure difference value of the two,
Δ P=Pwater=P1-P0 Δs (3)
Then the Δ P for being obtained according to measurement, height of water level is calculated according to formula (1)
In second embodiment of the invention, the pressure detecting module include first pressure sensor S1 and
Second pressure sensor, as shown in Figure 6.The first pressure sensor is placed in the sealed gas chamber
Top, the second pressure sensor be located at the sealed gas chamber outside, with the first pressure
Sensor is oppositely arranged, and the first pressure sensor is used to measure the air pressure P1 in sealed gas chamber, institute
Second pressure sensor is stated for measuring the atmospheric pressure P0 outside the sealed gas chamber, by calculating the two
Difference, it is also possible to return to calculate and obtain the height of water level.
Pressure detecting module described in third embodiment of the invention is absolute pressure acquisition module, such as Fig. 7
It is shown.The pressure detecting module includes baroceptor, single-chip microcomputer and input/output pin.It is described
Baroceptor is used to detect the first air pressure P11 before testing container water filling in the sealed gas chamber, and
The second air pressure P12 in detection testing container after water filling in the sealed gas chamber；Using first gas
Mathematic interpolation between pressure and the second air pressure obtains height of water level.
Δ P=Pwater=P11-P12 (5)
As shown in figure 8, there is a signal of communication line between washing machine CPU and pressure detecting module
RST.When washing machine needs water filling, a pulse is sent to pressure detecting by signal of communication line
Single-chip microprocessor MCU in module, after MCU receives signal, records current pressure sensor PSensor
The air pressure P11 that detection is obtained is Reference pressure, and it is ginseng then to measure the air pressure P12 for obtaining with P11
Air pressure is examined, the difference DELTA P of the pressure is proportional to height of water level y.
This method is by recording the atmospheric pressure value P11 before water inlet, it is to avoid atmospheric pressure wave zone comes
Height of water level zero point drift.
Level sensor proposed by the invention can be not only used for washing machine, it is also possible to be applied to drink
Water dispenser, dish-washing machine etc. need to carry out the field of level measuring.
Particular embodiments described above, is carried out to the purpose of the present invention, technical scheme and beneficial effect
Further describe, it should be understood that the foregoing is only specific embodiment of the invention,
It is not intended to limit the invention, all any modifications within the spirit and principles in the present invention, made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of water level detecting system, it includes：
Level vessels to be measured, the liquid for storing certain volume；
Conduit, its one end is connected with sealed gas chamber, and the other end is connected with the level vessels to be measured；
Sealed gas chamber, its air admission hole is connected with the conduit, and the top of the sealed gas chamber is to be measured with described
The top of level vessels is concordant；When the water level in level vessels to be measured changes, in sealed gas chamber
Air pressure can also change, by measuring the change of air pressure in sealed gas chamber, can extrapolate described
The height of liquid in level vessels to be measured；
Waterproof and breathable barrier film, positioned at conduit and the interface of sealed gas chamber, can allow for gas molecule and leads to
Cross, prevent hydrone from passing through, to ensure the air pressure in sealed gas chamber and to lead intraductal atmospheric pressure equal, but
Play a part of waterproof；
Pressure detecting module, is placed in sealed gas chamber, for measuring the air pressure in the sealed gas chamber.
2. the system as claimed in claim 1, wherein, the material of the conduit is using soft bendable
Folding material.
3. the system as claimed in claim 1, wherein, the waterproof and breathable barrier film is that macromolecule is thin
Film.
4. the system as claimed in claim 1, wherein, the pressure detecting module is pressure difference sensing
Device.
5. system as claimed in claim 4, wherein, the differential pressure pickup is pressure-strain film.
6. system as claimed in claim 5, wherein, the pressure-strain film is metal strain plate
Or using the silicon piezoresistance type pressure-strain film of MEMS technology processing.
7. the system as described in claim 4 or 5, wherein, as the internal pressure P1 of airtight chamber
When unequal with outside atmospheric pressure P0, cause the deformation of the pressure-strain film diaphragm, by surveying
Amount piezo-resistance change in resistance, is calculated the pressure difference value of the two；Then according to the pressure difference value
It is calculated the height of water level in level vessels to be measured.
8. the system as claimed in claim 1, wherein, the pressure detecting module includes the first pressure
Force snesor and second pressure sensor, the first pressure sensor are placed in the sealed gas chamber
Top, the second pressure sensor is located at outside the sealed gas chamber, is sensed with the first pressure
Device is oppositely arranged.
9. system as claimed in claim 8, wherein, the first pressure sensor is used to measure
The first air pressure in sealed gas chamber, the second pressure sensor is used to measure outside the sealed gas chamber
The second air pressure, obtain water level to be measured by calculating the mathematic interpolation between the first air pressure and the second air pressure
Height of water level in container.
10. the system as claimed in claim 1, wherein, the pressure detecting module includes that pressure is passed
Sensor, for detecting the first air pressure before level vessels water filling to be measured in the sealed gas chamber, and detects
The second air pressure in level vessels to be measured after water filling in the sealed gas chamber；Using first air pressure and
Mathematic interpolation between second air pressure obtains the height of water level in level vessels to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510836577.0A CN106802176A (en) | 2015-11-26 | 2015-11-26 | A kind of water level detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510836577.0A CN106802176A (en) | 2015-11-26 | 2015-11-26 | A kind of water level detecting system |
Publications (1)
| Publication Number | Publication Date |
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| CN106802176A true CN106802176A (en) | 2017-06-06 |
Family
ID=58976751
Family Applications (1)
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|---|---|---|---|
| CN201510836577.0A Pending CN106802176A (en) | 2015-11-26 | 2015-11-26 | A kind of water level detecting system |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741380A (en) * | 2017-11-28 | 2018-02-27 | 青岛海洋地质研究所 | The experimental provision and method of hydrate changes of contents in a kind of accurate measure small size deposit |
| CN108398203A (en) * | 2018-05-14 | 2018-08-14 | 苏州名列膜材料有限公司 | A kind of blocking solution test device and blocking solution test system |
| TWI638980B (en) | 2017-08-24 | 2018-10-21 | 中華電信股份有限公司 | Air pressure water level gauge and measuring method thereof |
| CN108814502A (en) * | 2018-06-29 | 2018-11-16 | 歌尔股份有限公司 | A kind of dish-washing machine level measuring control method and system |
| CN109645824A (en) * | 2017-10-12 | 2019-04-19 | 佛山市顺德区美的饮水机制造有限公司 | Liquid level detection device and water dispenser with it |
| CN109870213A (en) * | 2019-02-15 | 2019-06-11 | 美的集团武汉制冷设备有限公司 | Liquid-level detecting method, liquid level detection device, air conditioner and computer readable storage medium |
| CN109870212A (en) * | 2019-02-15 | 2019-06-11 | 美的集团武汉制冷设备有限公司 | Reference level acquisition device and acquisition methods, air conditioner, computer readable storage medium |
| CN109959421A (en) * | 2017-12-25 | 2019-07-02 | 博世热力技术（上海）有限公司 | Water-level detecting device |
| CN109959366A (en) * | 2019-04-12 | 2019-07-02 | 清华大学 | Depth of water probe, depth of water detection system and elementary errors water-depth measurement method |
| CN110779596A (en) * | 2018-07-25 | 2020-02-11 | 科勒公司 | Water level detection by pressure sensing device |
| CN111118864A (en) * | 2018-10-30 | 2020-05-08 | 无锡小天鹅电器有限公司 | Liquid storage box for clothes treatment device and clothes treatment device |
| CN111857190A (en) * | 2019-04-29 | 2020-10-30 | 安世亚太科技股份有限公司 | Light-cured resin liquid level control device and method |
| CN112113632A (en) * | 2020-08-03 | 2020-12-22 | 惠州拓邦电气技术有限公司 | Water quantity detection method and device and dust collector |
| CN113466082A (en) * | 2021-06-29 | 2021-10-01 | 西安西电变压器有限责任公司 | High-vacuum intelligent micro-water measuring device and method |
| US11725373B2 (en) | 2019-12-14 | 2023-08-15 | Kohler Co. | Drain system for bathtub |
| US11732448B2 (en) | 2018-06-25 | 2023-08-22 | Kohler Co. | Faucet with one-piece trim |
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| US20110203365A1 (en) * | 2008-10-28 | 2011-08-25 | Elbi International S.P.A. | Device for detecting the liquid level in the washing bath of a washing machine |
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Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI638980B (en) | 2017-08-24 | 2018-10-21 | 中華電信股份有限公司 | Air pressure water level gauge and measuring method thereof |
| CN109645824A (en) * | 2017-10-12 | 2019-04-19 | 佛山市顺德区美的饮水机制造有限公司 | Liquid level detection device and water dispenser with it |
| CN109645824B (en) * | 2017-10-12 | 2024-06-25 | 佛山市顺德区美的饮水机制造有限公司 | Liquid level detection device and water dispenser with same |
| CN107741380A (en) * | 2017-11-28 | 2018-02-27 | 青岛海洋地质研究所 | The experimental provision and method of hydrate changes of contents in a kind of accurate measure small size deposit |
| CN109959421A (en) * | 2017-12-25 | 2019-07-02 | 博世热力技术（上海）有限公司 | Water-level detecting device |
| CN108398203A (en) * | 2018-05-14 | 2018-08-14 | 苏州名列膜材料有限公司 | A kind of blocking solution test device and blocking solution test system |
| CN108398203B (en) * | 2018-05-14 | 2024-06-04 | 苏州名列膜材料有限公司 | Liquid resistance testing device and liquid resistance testing system |
| US11732448B2 (en) | 2018-06-25 | 2023-08-22 | Kohler Co. | Faucet with one-piece trim |
| CN108814502A (en) * | 2018-06-29 | 2018-11-16 | 歌尔股份有限公司 | A kind of dish-washing machine level measuring control method and system |
| US11169548B2 (en) | 2018-07-25 | 2021-11-09 | Kohler Co. | Water level detection via pressure sensing device |
| US11906990B2 (en) | 2018-07-25 | 2024-02-20 | Kohler Co. | Water level detection via pressure sensing device |
| CN110779596A (en) * | 2018-07-25 | 2020-02-11 | 科勒公司 | Water level detection by pressure sensing device |
| CN111118864A (en) * | 2018-10-30 | 2020-05-08 | 无锡小天鹅电器有限公司 | Liquid storage box for clothes treatment device and clothes treatment device |
| CN111118864B (en) * | 2018-10-30 | 2022-04-22 | 无锡小天鹅电器有限公司 | Liquid storage box for clothes treatment device and clothes treatment device |
| CN109870212A (en) * | 2019-02-15 | 2019-06-11 | 美的集团武汉制冷设备有限公司 | Reference level acquisition device and acquisition methods, air conditioner, computer readable storage medium |
| CN109870213A (en) * | 2019-02-15 | 2019-06-11 | 美的集团武汉制冷设备有限公司 | Liquid-level detecting method, liquid level detection device, air conditioner and computer readable storage medium |
| CN109959366B (en) * | 2019-04-12 | 2020-08-21 | 清华大学 | Differential water depth measuring method |
| CN109959366A (en) * | 2019-04-12 | 2019-07-02 | 清华大学 | Depth of water probe, depth of water detection system and elementary errors water-depth measurement method |
| CN111857190A (en) * | 2019-04-29 | 2020-10-30 | 安世亚太科技股份有限公司 | Light-cured resin liquid level control device and method |
| US11725373B2 (en) | 2019-12-14 | 2023-08-15 | Kohler Co. | Drain system for bathtub |
| CN112113632A (en) * | 2020-08-03 | 2020-12-22 | 惠州拓邦电气技术有限公司 | Water quantity detection method and device and dust collector |
| CN113466082A (en) * | 2021-06-29 | 2021-10-01 | 西安西电变压器有限责任公司 | High-vacuum intelligent micro-water measuring device and method |
| CN113466082B (en) * | 2021-06-29 | 2023-10-03 | 西安西电变压器有限责任公司 | High-vacuum intelligent micro-water measuring device and method |
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Application publication date: 20170606 |