CN109140669A - Electric appliance and liquid shortage protection device and control method thereof - Google Patents
Electric appliance and liquid shortage protection device and control method thereof Download PDFInfo
- Publication number
- CN109140669A CN109140669A CN201810858864.5A CN201810858864A CN109140669A CN 109140669 A CN109140669 A CN 109140669A CN 201810858864 A CN201810858864 A CN 201810858864A CN 109140669 A CN109140669 A CN 109140669A
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- China
- Prior art keywords
- electric appliance
- liquid
- photodetector
- light source
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000007788 liquid Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 33
- 238000010586 diagram Methods 0.000 description 5
- 238000000691 measurement method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- 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
- G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention belongs to the technical field of liquid level detection, and particularly relates to an electric appliance, a liquid shortage protection device and a control method thereof, wherein the liquid shortage protection device comprises a liquid level detection device and a controller which are arranged in a container, the liquid level detection device comprises a light detector and a light source emitter, the light detector and the light source emitter are arranged at the upper and lower opposite positions of the container, and emitted light beams and the light detector are arranged in a straight line, so that whether the light source emitter is refracted in the container or not is conveniently judged; the light detector sends the starved signal to the controller when receiving the light beam of light source transmitter, the controller controls electrical apparatus stop operating condition when receiving the starved signal, compares with traditional electrical apparatus, can protect electrical components better, extension electrical apparatus life.
Description
Technical field
The invention belongs to water level detecting technical fields, and in particular to a kind of electric appliance and its scarce liquid protective device and controlling party
Method.
Background technique
Level measuring is widely used in all trades and professions, generally use float-ball type code sensor, throw-in type water transmitter,
Ultrasonic type water transmitter, radar type water transmitter, these modes are substantially more expensive or run complexity, therefore develop a kind of knot
Structure is simple, and lower-cost level testing methods are of great significance.
As patent No. CN105526992A discloses water level measurement method and device, terminal, which comprises obtain target
Anaclasis position, the target light diffracting position are rolled over after detection light is reflected from first medium to second medium with target incident angle
Penetrate position of the light on preset level face, a kind of medium is air in the first medium and second medium, another medium is
Water to be measured；Institute is determined according to known anaclasis position, the target light diffracting position, the target incident angle and target refractive angle
The target water level for stating water to be measured is poor, and the known anaclasis position is to survey light in known water level test with target incident angle from first
Position of the refraction light on preset level face after medium is reflected to second medium, the target refractive angle are the refractions after refraction
Angle.Above-mentioned patent disclosure passes through between target light diffracting position, known anaclasis position, target incident angle and target refractive angle
Relationship determines that target water level is poor, realizes the water-head for measuring water to be measured, and measurement method is easy, high-efficient, but the method is only
There is provided the methods of level measuring, can not be under water shortage and protect to device.
Summary of the invention
In order to solve level measuring method operation complexity or higher cost, device can not be protected in the case where lacking liquid status
The problems such as, the present invention provides a kind of electric appliance and its scarce liquid protective device and control method.
To achieve the above object, the technical scheme adopted by the invention is that: a kind of electric appliance lacks liquid protective device, including setting
Liquid level detection device in electric appliance container further includes controller, and the liquid level detection device includes photodetector and light source hair
Emitter, the photodetector and light source emitter are set to container relative position and the light beam and photodetector that are emitted up and down
It is arranged in straight line, is sent when the photodetector receives the light beam of light source emitter to controller and lack liquid signal, it is described
Controller controls electric appliance stop working state when receiving scarce liquid signal.
Further, photodetector/light source emitter is set to the position of container bottom or side and bottom connection, described
Light source emitter/photodetector is set to the top of container.
It further, further include beam condensing unit, the beam condensing unit includes the convex lens for being set to photodetector periphery.
Further, photodetector is the photosensitive sensor of photoelectric conversion, and the photodetector switchs to received light beam
Controller is conducted to after electric signal.
It further, further include receiving terminal, the reception terminal is equipped with alarm signal, and the controller and reception are eventually
End is connected by wireless signal, is sent simultaneously to reception terminal when the controller receives scarce liquid signal, the reception terminal
Start alarm signal when receiving scarce liquid signal.
A kind of scarce liquid protection control method of electric appliance, which comprises
S1: light source emitter as beam emissions end, photodetector as beam reception end, beam reception end and electric appliance
The input terminal of controller is connected；
S2: incidence angle (α) of the light source emitter in the first medium (n1) is obtained, so that it is in second of medium (n2)
Middle to reflect, the medium when no liquid in container in container is the first medium (n1), then light source emitter issues
Light beam does not reflect, and photodetector receives the light beam of optical transmitting set in a reservoir；
S3: it after photodetector receives light beam in the step S2, is sent to controller and lacks liquid signal；
S4: after controller receives scarce liquid signal in the step S3, controller controls electric appliance stop working state.
Further, in step S2 when there is liquid in container, then refraction angle of the light source emitter in second of medium
(β) meets: n1*sin α=n2*sin β, photodetector do not receive the light beam of light source emitter.
Further, controller control electric appliance carries out in container whether scarce the fault-tolerant of liquid is sentenced in step S4 before stopping working
It is disconnected.
Further, fault tolerance judgment the following steps are included:
S41: after photodetector receives light beam N seconds, controller judges no liquid in container；
S42: when photodetector intermittent reception to light beam and when being unsatisfactory for N seconds, controller judges that state is indefinite, without
Control.
Further, electric appliance stop working state include the component of electric appliance stop working or electric appliance be directly entered it is standby, close
Machine state.
A kind of electric appliance, including humidifier lack liquid using above-mentioned electric appliance and protect control method.
The present invention provides a kind of electric appliance and its scarce liquid protective device and control method, and the scarce liquid protective device includes setting
Liquid level detection device and controller in electric appliance container, the liquid level detection device include photodetector and light source emitter,
The photodetector and light source emitter are set to container or more relative position and the light beam and photodetector emitted is in one
Straight line arrangement, convenient for judging whether light source emitter reflects in a reservoir；The photodetector receives light source emitter
Light beam when sent to controller and lack liquid signal, electric appliance stop working state is controlled when the controller receives scarce liquid signal,
Compared with traditional electric appliance, electric appliance component can be preferably protected, extends electric appliance service life.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that one electric appliance of embodiment lacks that liquid protective device does not reflect；
Fig. 2 is the structural schematic diagram that one light source emitter of embodiment reflects in a reservoir；
Fig. 3 is the work flow diagram that electric appliance lacks that liquid protects control method；
Fig. 4 is the structural schematic diagram that two electric appliance of embodiment lacks that liquid protective device does not reflect；
Fig. 5 is the structural schematic diagram that two light source emitter of embodiment reflects in a reservoir.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, is clearly and completely retouched to the technical solution in the present invention
It states, it is clear that the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.
A kind of electric appliance is humidifier, by taking humidifier as an example.
Embodiment one
As depicted in figs. 1 and 2, a kind of humidifier water-shortage protection device, including liquid level detection device, controller 4 and optically focused
Device 5；
For liquid level detection device since photodetector 2 and light source emitter 3 form, photodetector 2 is set to humidifier water tank 1
The minimum position of middle liquid level is generally disposed at the position of humidifier water tank 1 bottom or side and bottom connection, light source emitter 3
It is set to 2 oblique upper of photodetector, i.e. the top of humidifier water tank 1 and the light beam emitted and photodetector 2 is in straight line
Arrangement, photodetector 2 is the photosensitive sensor of photoelectric conversion, when the photosensitive sensor receives the light beam of light source emitter,
It is translated into electric signal, sends signal of water shortage to controller 5；
Controller 4 controls electric appliance and is in work or halted state, and control humidifier stops work when receiving signal of water shortage
Make state；
Beam condensing unit includes convex lens 5, is set to the periphery of photodetector 2, for enhancing light beam, guarantees photodetector 2
The reliability of detection.
Humidifier water-shortage protection device further includes receiving terminal, and the reception terminal is equipped with alarm signal, the control
Device is connect with reception terminal by wireless signals such as Wifi or 2/3/4G network or bluetooths, and the controller receives signal of water shortage
When send simultaneously to receiving terminal, the reception terminal starts alarm signal when receiving signal of water shortage, the reception terminal is
Mobile phone, plate, computer, body-building equipment etc..
As shown in figure 3, a kind of humidifier excessive low water level protection control method, which comprises
S1: as beam emissions end, the light beam can be laser etc. can occur obviously to reflect simultaneously energy light source emitter
It is easy detection, photodetector is connected as beam reception end, beam reception end with the input terminal of the controller of humidifier；
S2: incident angle α of the light source emitter in the first medium n1 is obtained, so that it occurs in second of medium n2
Refraction, the refractive index of described two media is inconsistent, the first medium is air, second of media fluid in such the present embodiment
For water, medium when anhydrous in water tank in container is the first medium air n1, then the light beam that light source emitter issues is not
It reflects, as shown in Figure 1, photodetector receives the light beam of optical transmitting set in water tank；
When there is water in water tank, then refraction angle β of the light source emitter in second of medium meets: n1*sin α=n2*
Sin β, photodetector do not receive the light beam of light source emitter, as shown in Figure 2；
S3: after photodetector receives light beam in the step S2, signal of water shortage is sent to controller；
S4: after controller receives signal of water shortage in the step S3, controller is sentenced to whether water shortage progress is fault-tolerant in water tank
It is disconnected；
S41: after photodetector receives light beam N seconds, controller judge it is anhydrous in water tank, controller control humidifier stop
Only working condition, including the work of stopping atomizing device of humidifier or humidifier are directly entered standby, off-mode, and N seconds are set as
3-5 seconds；
S42: when photodetector intermittent reception to light beam and when being unsatisfactory for N seconds, controller judges that state is indefinite, without
Control, is set as 3-5 seconds for N seconds.
Embodiment two
As shown in Fig. 4, Fig. 5 and Fig. 3, the differentiation of the present embodiment and embodiment one is that light source emitter 3 is set to humidification
The minimum position of liquid level in device water tank 1 is generally disposed at the position of humidifier water tank 1 bottom or side and bottom connection, and institute
The light beam and photodetector 2 of transmitting arrange that photodetector 2 is set to 3 oblique upper of light source emitter, i.e. humidifier in straight line
The top of water tank 1.
The present invention finds out humidifier liquid level using the refraction principle of light, by installing light source emitter and light on humidifier
Detector reflects when so that light source emitter passing to second of medium in the first medium, when photodetector receives
When light beam, electric signal transmission is translated into controller, and controller judges that humidifier is in exsiccosis, allows humidifier in time
Atomising device stop working or humidifier is directly entered standby, off-mode, can be preferably compared with traditional humidifier
Atomizing piece, power tube are protected, container service life is extended.
It above are only preferred embodiment of the invention, but the design concept of the present invention is not limited to this, all benefits
It is made a non-material change to the present invention, should all be belonged to behavior that violates the scope of protection of the present invention with this design.
Claims (11)
1. a kind of electric appliance lacks liquid protective device, including the liquid level detection device being set in electric appliance container, it is characterised in that: also wrap
Controller is included, the liquid level detection device includes photodetector and light source emitter, and the photodetector and light source emitter are set
It is placed in container or more relative position and the light beam and photodetector emitted arranges that the photodetector is received in straight line
To light source emitter light beam when to controller send lack liquid signal, when the controller receives scarce liquid signal control electric appliance stop
Only working condition.
2. electric appliance according to claim 1 lacks liquid protective device, it is characterised in that: the photodetector/light source emitter
It is set to the position of container bottom or side and bottom connection, the light source emitter/photodetector is set to the top of container.
3. electric appliance according to claim 1 lacks liquid protective device, it is characterised in that: it further include beam condensing unit, the optically focused
Device includes the convex lens for being set to photodetector periphery.
4. electric appliance according to claim 1 lacks liquid protective device, it is characterised in that: the photodetector is photoelectric conversion
Photosensitive sensor, the photodetector are conducted to controller after received light beam is switched to electric signal.
5. electric appliance according to claim 1 lacks liquid protective device, it is characterised in that: further include receiving terminal, the reception
Terminal is equipped with alarm signal, and the controller is connect with reception terminal by wireless signal, and the controller receives scarce liquid
Simultaneously to terminal transmission is received when signal, the reception terminal starts alarm signal when receiving scarce liquid signal.
6. a kind of electric appliance lacks liquid and protects control method, it is characterised in that: the described method includes:
S1: light source emitter is as beam emissions end, and photodetector is as beam reception end, the control at beam reception end and electric appliance
The input terminal of device is connected；
S2: obtaining incidence angle (α) of the light source emitter in the first medium (n1), so that its hair in second of medium (n2)
Raw refraction, the medium when no liquid in container in container is the first medium (n1), then the light beam that light source emitter issues
It does not reflect, photodetector receives the light beam of optical transmitting set in a reservoir；
S3: it after photodetector receives light beam in the step S2, is sent to controller and lacks liquid signal；
S4: after controller receives scarce liquid signal in the step S3, controller controls electric appliance stop working state.
7. electric appliance according to claim 6 lacks liquid and protects control method, it is characterised in that: when in container in the step S2
When having liquid, then refraction angle (β) of the light source emitter in second of medium meets: n1*sin α=n2*sin β, photodetector
The light beam of light source emitter is not received.
8. electric appliance according to claim 6 lacks liquid and protects control method, it is characterised in that: controller control in the step S4
Electric appliance processed carries out the fault tolerance judgment that liquid whether is lacked in container before stopping working.
9. electric appliance according to claim 8 lacks liquid and protects control method, it is characterised in that: the fault tolerance judgment includes following
Step:
S41: after photodetector receives light beam N seconds, controller judges no liquid in container；
S42: when photodetector intermittent reception to light beam and when being unsatisfactory for N seconds, controller judges that state is indefinite, without control
System.
10. electric appliance according to claim 6 lacks liquid and protects control method, it is characterised in that: the electric appliance stops working shape
State includes that the component of electric appliance stops working or electric appliance is directly entered standby, off-mode.
11. a kind of electric appliance, including humidifier, it is characterised in that: lack liquid using any electric appliance of claim 6-10 and protect
Control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810858864.5A CN109140669A (en) | 2018-07-31 | 2018-07-31 | Electric appliance and liquid shortage protection device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810858864.5A CN109140669A (en) | 2018-07-31 | 2018-07-31 | Electric appliance and liquid shortage protection device and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109140669A true CN109140669A (en) | 2019-01-04 |
Family
ID=64798562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810858864.5A Pending CN109140669A (en) | 2018-07-31 | 2018-07-31 | Electric appliance and liquid shortage protection device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109140669A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779725A (en) * | 2020-12-28 | 2021-05-11 | 珠海格力电器股份有限公司 | Detergent box liquid level detection method and clothes treatment equipment with same |
| CN113008331A (en) * | 2021-03-31 | 2021-06-22 | 广东奥迪威传感科技股份有限公司 | Liquid shortage detection system |
| CN114370678A (en) * | 2021-12-15 | 2022-04-19 | 北京小米移动软件有限公司 | Humidifying apparatus and control method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56118623A (en) * | 1980-02-22 | 1981-09-17 | Ricoh Co Ltd | Detecting method for transparent substance |
| JPS58179319A (en) * | 1982-04-15 | 1983-10-20 | Matsushita Electric Ind Co Ltd | Liquid level detecting device |
| JPS63281021A (en) * | 1987-05-13 | 1988-11-17 | Japan Organo Co Ltd | Liquid level detector using refraction of light |
| JP2006300793A (en) * | 2005-04-22 | 2006-11-02 | Yamatake Corp | Optical liquid-level sensor |
| CN101832806A (en) * | 2009-03-10 | 2010-09-15 | 雀巢产品技术援助有限公司 | The optical level detector that is used for beverage machine |
| CN102519550A (en) * | 2011-12-12 | 2012-06-27 | 南京中电自动化有限公司 | Online silt density index (SDI) analyzing instrument level optical detection method and device |
| CN203785742U (en) * | 2014-01-24 | 2014-08-20 | 美的集团股份有限公司 | Water level detection device and liquid container |
-
2018
- 2018-07-31 CN CN201810858864.5A patent/CN109140669A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56118623A (en) * | 1980-02-22 | 1981-09-17 | Ricoh Co Ltd | Detecting method for transparent substance |
| JPS58179319A (en) * | 1982-04-15 | 1983-10-20 | Matsushita Electric Ind Co Ltd | Liquid level detecting device |
| JPS63281021A (en) * | 1987-05-13 | 1988-11-17 | Japan Organo Co Ltd | Liquid level detector using refraction of light |
| JP2006300793A (en) * | 2005-04-22 | 2006-11-02 | Yamatake Corp | Optical liquid-level sensor |
| CN101832806A (en) * | 2009-03-10 | 2010-09-15 | 雀巢产品技术援助有限公司 | The optical level detector that is used for beverage machine |
| CN102519550A (en) * | 2011-12-12 | 2012-06-27 | 南京中电自动化有限公司 | Online silt density index (SDI) analyzing instrument level optical detection method and device |
| CN203785742U (en) * | 2014-01-24 | 2014-08-20 | 美的集团股份有限公司 | Water level detection device and liquid container |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779725A (en) * | 2020-12-28 | 2021-05-11 | 珠海格力电器股份有限公司 | Detergent box liquid level detection method and clothes treatment equipment with same |
| CN112779725B (en) * | 2020-12-28 | 2022-03-29 | 珠海格力电器股份有限公司 | Detergent box liquid level detection method and clothes treatment equipment with same |
| CN113008331A (en) * | 2021-03-31 | 2021-06-22 | 广东奥迪威传感科技股份有限公司 | Liquid shortage detection system |
| CN113008331B (en) * | 2021-03-31 | 2023-08-22 | 广东奥迪威传感科技股份有限公司 | Liquid shortage detection system |
| CN114370678A (en) * | 2021-12-15 | 2022-04-19 | 北京小米移动软件有限公司 | Humidifying apparatus and control method thereof |
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Application publication date: 20190104 |