CN102374562A - Range hood with automatic flue gas detection device - Google Patents
Range hood with automatic flue gas detection device Download PDFInfo
- Publication number
- CN102374562A CN102374562A CN2010102589794A CN201010258979A CN102374562A CN 102374562 A CN102374562 A CN 102374562A CN 2010102589794 A CN2010102589794 A CN 2010102589794A CN 201010258979 A CN201010258979 A CN 201010258979A CN 102374562 A CN102374562 A CN 102374562A
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- Prior art keywords
- flue gas
- ultrasonic wave
- filter
- range hood
- signal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
Abstract
The invention relates to a range hood with an automatic flue gas detection device. The range hood comprises a main body and a volute installed inside the main body, with a fan driven by an electric motor positioned inside the volute. The range hood also includes a first filtering instrument disposed on an opening towards the flue gas source and an ultrasonic sensor arranged inside the main body and disposed behind the first filtering instrument. After passing through the first filtering instrument firstly, external flue gas can reach the ultrasonic sensor.
Description
[technical field]
The present invention relates to a kind of range hood, refer in particular to a kind of ultrasonic technology that utilizes and realize the range hood that flue gas detects automatically, and the control method of this lampblack absorber.
[background technology]
Smoke exhaust ventilator is the kitchen household electrical appliance that generally use during people live.Be accompanied by development of science and technology, the intelligent inexorable trend that has become the household electrical appliances development.Usually, all be to select the corresponding work state according to use habit during smoke exhaust ventilator work by the user, such as selecting certain fan speed gear: 1,2,3 ....For such range hood, the user need be according to the state manual operation smoke exhaust ventilator of flue gas, and another shortcoming of this range hood is: fan often is in fixing range state; Gear is too low; Can not finely reach lampblack-pumped effect, or gear is too high, wastes energy.Therefore, a kind of range hood according to smoke condition intelligence change smoke exhaust ventilator gear of design is a very significant thing.
China utility model patent 200920000606.X has disclosed a kind of smoke exhaust ventilator of regulating air draft speed according to oil smoke concentration automatically; The device that wherein is used to detect oil smoke concentration is mounted in the photodetector unit on the lampblack absorber; This photodetector unit comprises optical transmitting set and photodetector; One space is arranged between the two, can get into this space and detected by this photodetector unit from the oil smoke of surrounding environment.The shortcoming of this design is: must keep optical transmitting set emission source and photo-detector the source of accepting than high cleanliness; Otherwise possibly have a strong impact on the sensitivity of detection and the degree of accuracy of feedback; Then; The environment for use of range hood inevitably produces a large amount of oil smoke, is difficult to guarantee enough cleannes after long-term the use.
The technology that another kind is used to detect flue gas concentration is a ultrasonic wave; Ultrasonic technology is fast-developing in recent years technology; Hyperacoustic acoustical signal has good induction to flue gas; Therefore, ultrasonic technology is applied to the flue gas detection and can greatly improves the operating efficiency of smoke exhaust ventilator and user's use comfort undoubtedly.U.S. Pat, 5074,281 and US6,324,889B1 has all disclosed and has used ultrasonic wave to detect the technical scheme of flue gas concentration.Yet; In the smoke exhaust ventilator running, because environment temperature, changing factors such as ambient humidity are to circuit board; The influence of ultrasonic wave sensing device and ultrasonic signal; It is too big or too little that the reception signal of ultrasonic wave sensing device might become, and at this moment just is difficult to judge the influence of flue gas for ultrasonic signal, and this will certainly influence the accuracy that the ultrasonic wave flue gas detects effect.
[summary of the invention]
The object of the present invention is to provide a kind of flue gas automatic detection device of improved use ultrasonic technology, improve the accuracy that the ultrasonic wave flue gas detects.
Correspondingly, the range hood with flue gas automatic detection device of one embodiment of the present invention, it comprises fuselage main body and the spiral case that is installed in this fuselage main body, and the fan by electrical motor driven is installed in the spiral case; Also comprise be installed in the fuselage main body towards first filter of the opening part in flue gas source be installed in the ultrasonic wave sensing device in the fuselage main body; This ultrasonic wave sensing device is positioned at the back of first filter; Outside flue gas through after first filter, arrives this ultrasonic wave sensing device at first.
As further improvement of the present invention, this ultrasonic wave sensing device is arranged in the space between first filter and the spiral case.
As further improvement of the present invention; The ultrasonic wave sensing device comprises signal generator and the signal feedback device on two opposing sidewalls of the inner space that is installed in the fuselage main body respectively; Between signal generator and signal feedback device, form the spatial channel that can pass through for flue gas, signal generator ultrasonic waves transmitted signal feeds back through this spatial channel and by the signal feedback device.
As further improvement of the present invention; Range hood also comprises second filter that is arranged in the fuselage main body; This second filter is positioned at the back of ultrasonic wave sensing device, and outside flue gas through after the ultrasonic wave sensing device, arrives second filter at first.
As further improvement of the present invention, described first filter is the metal filter screen of lattice-shaped, and described second filter is the intensive screen pack of being processed by material with carbon element.
The invention has the beneficial effects as follows: the ultrasonic wave sensing device is arranged in the fuselage body interior space of first filter back; Make the ultrasonic wave sensing device be in a metastable environment temperature, the ambient humidity; Help avoiding the acute variation of external environment condition that ultrasonic signal is surveyed the interference of flue gas concentration, thereby obtain result of detection more accurately.
[Brief Description Of Drawings]
Fig. 1 is the structural representation of the range hood of one embodiment of the present invention;
Fig. 2 is the sketch map of the control system of range hood of the present invention;
Fig. 3 is the detailed structure sketch map of the ultrasonic wave module among Fig. 2;
Fig. 4 is the self check process sketch map of the control system of range hood;
Fig. 5 is the control procedure sketch map of the ultrasonic wave module among Fig. 5;
Fig. 6 a is the distribution sketch map of ultrasonic signal sampled value under range hood startup back and the situation that does not have flue gas;
Fig. 6 b is the distribution sketch map of ultrasonic signal sampled value under range hood startup back and the situation that flue gas is arranged;
Fig. 7 a is the mean value distribution situation sketch map corresponding to the sampled signal of Fig. 6 a;
Fig. 7 b is the mean value distribution situation sketch map corresponding to the sampled signal of Fig. 6 b.
[specific embodiment]
With reference to figure 1; The range hood 1 of one embodiment of the present invention comprises fuselage main body 10 and is installed in the spiral case 11 in the fuselage main body 10; Fan by electrical motor driven is installed in the spiral case 11; Fan is taken away oil smoke when rotating, range hood common on the structure of this range hood 1 and operation principle and the market is identical, is not described in detail at this.Fuselage main body 10 is provided with first filter 12 towards the opening part in flue gas source; In this embodiment; First filter 12 is metal filter screens of lattice-shaped; The gap of this metal filter screen is arranged so that outside flue gas is included in the grease in the flue gas being filtered part through therebetween the time, but this metal filter screen can not fully filter out whole greases and other impurity odorous in the flue gas.The ultrasonic wave sensing device is installed in the inner space of fuselage main body 10; And be positioned at the back of first filter 12; The spatial relation of said here " at the back " expression first filter and ultrasonic sensor; Refer to outside flue gas and must can arrive the ultrasonic wave sensing device at first through after first filter 12.The ultrasonic wave sensing device comprises signal generator 14 and signal feedback device 15.In this embodiment; Signal generator 14 and signal feedback device 15 are installed in respectively on two opposing sidewalls of inner space of fuselage main body 10; Like this between signal generator 14 and signal feedback device 15, form the spatial channel that to pass through for flue gas; Signal generator 14 ultrasonic waves transmitted signals feed back through this spatial channel and by signal feedback device 15; Thereby draw the disturbance regime of receiving through the ultrasonic signal of this spatial channel, and further judge the concentration through the flue gas of this spatial channel thus, concrete determination methods can be described in detail in following paragraph.Second filter 13 is set between spiral case 11 and ultrasonic wave sensing device; In this embodiment; Second filter 13 is the intensive screen packs that are made by material with carbon element (for example activated carbon), because the grid gap of first filter 12 is big and be difficult to filter the impurity in the flue gas fully, second filter 13 is set can further be filtered flue gas; Thereby make to be discharged to the flue gas clean enough in the outdoor air, help environmental protection.It is to be noted; Second filter 13 might not be necessary in other embodiments of the present invention; Yet ultrasonic wave sensing device of the present invention can not be installed in the back of second induction installation 13, in order to avoid too low being difficult to of the flue gas concentration through the ultrasonic wave sensing device surveyed.
With reference to figure 2, the control system of the range hood of one embodiment of the present invention comprises main control module 2, ultrasonic wave module 3, display button module 4, fan motor 5, lamp 6, and external power supply 7.Wherein main control module 2 is control maincenters of range hood, and it comprises a circuit board with control chip, and its installation site can be arranged on the correct position of fuselage main body 10 of range hood, for example is arranged on the rear of display control module 4.Main control module 2 receives from ultrasonic wave module 3 and display button module 4, and correspondingly sends command signal to ultrasonic wave module 3, display button module 4, motor fan 5, lamp 6 under the driving of external power supply 7.Ultrasonic wave module 3 is independently modules, and its concrete framework is as shown in Figure 3, below can describe in detail.Can interconnect through power line and data wire between ultrasonic wave module 3 and the main control module 2; And through D-BUS II communication protocol exchange message; Such design can let ultrasonic wave module 3 be independent of main control module 2, thereby can be mounted freely on the range hood on any suitable position, for example can ultrasonic wave module 3 be installed in the position near the ultrasonic wave sensing device; So promptly can make full use of the space; Also be convenient to the design (if ultrasonic wave module 3 is integrated on the main control module 2, can make that the volume of The whole control unit is too huge, and inconvenience finding suitable position to install) of whole system.Can interconnect through power line and data wire between display button module 4 and the main control module 2; Be connected through data wire between the ultrasonic wave module 3, and through D-BUS II communication protocol exchange message, the key command that display button module 4 receives according to operator's input; To main control module 2 transmission information; Be used for controlling the running of range hood, also can be used for controlling the work of ultrasonic wave module to ultrasonic wave module 3 transmission information; Likewise, display button module 4 also can show control instruction or the range hood work state information that main control module 2 and ultrasonic wave module 3 are sent, and lets the operator understand the duty of range hood.Fan motor 5 and 6 unidirectional respectively receptions of lamp come the instruction of Autonomous Control module 2, the startup of realization motor 5/stop/speed change, and perhaps lamp 6 is bright/go out.
With reference to figure 2, the control system of range hood of the present invention comprises that S1 to S7 amounts to seven steps, and after seven steps, then the ultrasonic wave module of range hood is in normal duty.
With reference to figure 3, ultrasonic wave module 3 comprises MCU30 (Micro Control Unit, micro-control unit), oscillator 31; Amplifier 1, shaping circuit 33, ultrasonic wave sensing device 34, switch 1; Amplifier 2 36, bandpass filter 37, peak detection circuit 38, and switch 2 39.The operation principle of ultrasonic wave module 3 is: the enabling of MCU30 control generator 31, frequency of oscillation, the state of switch 1, switch 2 39, and the multiplication factor of amplifier 2 36.Oscillator 31 can produce the signal of certain frequency.Amplifier one is amplified to certain amplitude with the output signal of oscillator 31.Shaping circuit 33 is exported to ultrasonic wave sensing device 34 with amplifier one 32 output signal shapings.Ultrasonic wave sensing device 34 receives the pumping signal of shaping circuit 33 outputs, sends acoustical signal, and receiving feedback signals.Amplifier 2 39 amplifies feedback signal.Feedback signal filtering after 37 pairs of amplifications of bandpass filter.Peak detection circuit 38 outputs to MCU30 confession AD sampling from exchanging feedback signal extraction crest voltage.
The structure of ultrasonic wave module 3 of the present invention and the course of work have following characteristic: structurally, two switches are set: i.e. switch 1 and switch 2 39.In the course of the work, cooperate with reference to figure 5, this two switches conducting/shutoff successively, thus effectively stoped the shutoff noise of small-signal switch in amplification process to be imported.The concrete course of work is following:
Step S30: oscillator 31 enables, and this moment, switch 1 all was in off state with switch 2 39;
Step S31: oscillator 31 sends pumping signal, and through sending after amplifier one 32 amplifications, this moment, switch 1 all was in off state with switch 2 39;
Step S32: wait for the ultrasonic wave feedback signal, this moment, switch 1 all was in off state with switch 2 39;
Step S33: actuating switch 1, receiving feedback signals, and through amplifier 2 36 amplifications, this moment, switch 2 39 was in off state;
Step S34: actuating switch 2 39 beginning AS samplings, this moment, switch 1 all was in conducting state with switch 2 39;
Step S35: free time, calculate fan speed according to sampled data, this moment, switch 1 all was in off state with switch 2 39.
Ultrasonic system can receive the influence of a variety of factors, such as environment temperature, and ambient humidity, flue gas or the like.These influence are in circuit board, and ultrasonic wave sensing device and ultrasonic signal change the ultrasonic wave feedback signal that receives.If environment temperature, ambient humidity change when violent, can cause ultrasonic signal too big or too little.For example: if environment temperature; Ambient humidity change acutely cause ultrasonic signal under the situation of no flue gas with regard to very greatly, can bring a problem like this, the ultrasonic signal amplitude is excessive; When flue gas; The ultrasonic signal that much collects all is a saturation value, and is very little between the wave zone of the very big and mean value of hyperacoustic mean value, thereby causes system to be difficult to judge whether flue gas.Again for example: if environment temperature; The ambient humidity variation acutely causes ultrasonic signal just very little under the situation of no flue gas; Can bring the another one problem like this, the ultrasonic signal amplitude is too small, and whether no matter flue gas arranged; Ultrasonic signal all is in a very little scope, to fluctuate, and causes system to be difficult to judge whether flue gas equally.
Corresponding to above problem; Another feature of ultrasonic wave module 3 of the present invention is: amplifier 2 36 is multiplication factor adjustable amplifier; Can control its multiplication factor through MCU30, such respective outer side edges Design of software can solve the influence to ultrasonic signal of environment temperature, ambient humidity acute variation.Ultrasonic signal threshold values V is set in MCU in advance
MAXAnd V
MIN, according to the actual ultrasonic signal that samples, carry out following multiplication factor adjustment:
As sample mean V
Mean ValueDuring＞VMAX, reduce the multiplication factor of amplifier 2 36, until V
Mean Value＜V
MAX
As sample mean V
Mean Value＜V
MINThe time, the multiplication factor of increase amplifier 2 36 is until V
Mean Value＞V
MIN
Like this, the sample mean V of ultrasonic signal
Mean ValueJust drop on a reasonably interval, thereby guaranteed that ultrasonic signal can well reflect the influence of flue gas.
With reference to figure 6a to Fig. 7 b, the operation principle and the control method thereof of the range hood of flue gas automatic detection device of the present invention is described below.
Ultrasonic signal can receive the influence of a variety of factors, such as environment temperature, and ambient humidity, flue gas or the like.But, if the ultrasonic wave sensing device is arranged on the fuselage interior like range hood shown in Figure 1 of the present invention, environment temperature then, factors such as ambient humidity are uniform relatively to the influence of ultrasonic signal.Fig. 6 a has shown the distribution of ultrasonic signal sampled value under certain fan speed of service.Can find out that from Fig. 6 a the ultrasonic signal sampled value distributes more even.Certainly, the size of fan speed also has certain influence to sampled value, and on the whole, fan speed is big more, and the discreteness of sampled value is big more.
Under same wind speed, Fig. 6 b has shown the influence of flue gas for sampled signal.Before beginning to occur from flue gas, the ultrasonic signal sampled value is more concentrated, and value is also bigger; After flue gas occurs, the ultrasonic signal sampled value one in a big way in fluctuation, the while sampled value more is partial to low value; After flue gas disappeared, the ultrasonic wave sampled value returned to higher value again, and fluctuateed among a small circle at one.
Sampled signal is made mean value calculation within a certain period of time, can obtain the mean value figure of Fig. 7 a and Fig. 7 b according to the signal of Fig. 6 a and Fig. 6 b respectively.Comparison diagram 7a and Fig. 7 b can find out that flue gas has the obvious variation rule for the influence of the mean value of ultrasonic wave sampled signal, and that is exactly when no flue gas; Signal curve is relatively smoothly stable; After flue gas produced, owing to the weakening of flue gas to ultrasonic signal, the curve amplitude reduced.Owing to the discontinuity of flue gas, signal is beated acutely, on signal curve, shows as amplitude and shakes up and down again.Therefore, the present invention judges according to the variation of mean value amplitude and the size of flue gas mainly comprises following two schemes:
Scheme one: for different fan speeds is set different mean value threshold values; When the mean value of ultrasonic wave sampled signal is lower than a setting threshold values; Judge that it should improve fan speed, when the mean value of ultrasonic wave sampled signal is higher than a setting threshold values, judge that it should reduce fan speed.For example, set threshold values V respectively for fan speed Speed1, Speed2
Speed1And V
Speed2V
Mean ValueMean value for T1 to T2 sampled signal in the time period.As sampled value V
Mean Value＜V
Speed1The time, fan speed rises to 2 grades by 1 grade, as sampled value V
Mean Value＞V
Speed2The time, fan speed is reduced to 1 grade by 2 grades.
Scheme two: be that different fan speeds sets different mean value fluctuation ranges, and mean value in the certain hour is exceeded setting range count, and be that different fan speeds changes and sets the threshold values of counting, in order to judge the change of a fan speed.For example, the corresponding interval (V of different fluctuation range standards: Speed1 is set under different fan speed states
Speed1min, V
Speed1max), the corresponding interval (V of Speed2
Speed2min, V
Speed2max), V
Mean ValueMean value for T1 to T2 sampled signal in the time period.Under the Speed1 state, if ultrasonic signal each V in T1 to T2 time range of sampling
Mean ValueExceed (V
Speed1min, V
Speed1max) count value greater than established standards C
MaxThe time, then thinking has bigger flue gas, and fan speed rises to 2 grades by 1 grade.Under the Speed2 state, if ultrasonic signal each V in T1 to T2 time range of sampling
Mean ValueExceed (V
Speed2min, V
Speed2max) count value less than established standards C
MinThe time, thinking has less flue gas, and fan speed changes to 1 grade by 2 grades.
The advantage of scheme one and scheme two: using cleverly, algorithm fully extracts the effective information of flue gas for the ultrasonic signal influence; Two methods can be according to the concrete designs of smoke exhaust ventilator and are adopted 2 kinds of methods respectively or 2 kinds of methods are combined, thereby reach the effect that changes the smoke exhaust ventilator fan speed according to the flue gas state automatically.
It more than is preferred embodiments of the present invention; It is to be noted; Those of ordinary skill in the art can be based on the announcement of this embodiment; On the basis of not paying creative work, make adaptive change, these rational changes should be within the protection domain of claim of the present invention.
Claims (5)
1. range hood with flue gas automatic detection device, it comprises fuselage main body and the spiral case that is installed in this fuselage main body, and the fan by electrical motor driven is installed in the spiral case; Also comprise be installed in the fuselage main body towards first filter of the opening part in flue gas source be installed in the ultrasonic wave sensing device in the fuselage main body; It is characterized in that; This ultrasonic wave sensing device is positioned at the back of first filter; Outside flue gas through after first filter, arrives this ultrasonic wave sensing device at first.
2. the range hood with flue gas automatic detection device as claimed in claim 1 is characterized in that, this ultrasonic wave sensing device is arranged in first filter and the space between the spiral case in the fuselage main body.
3. the range hood with flue gas automatic detection device as claimed in claim 1; It is characterized in that; This ultrasonic wave sensing device comprises signal generator and the signal feedback device on two opposing sidewalls of the inner space that is installed in the fuselage main body respectively; Between signal generator and signal feedback device, form the spatial channel that can pass through for flue gas, signal generator ultrasonic waves transmitted signal feeds back through this spatial channel and by the signal feedback device.
4. the range hood with flue gas automatic detection device as claimed in claim 1; It is characterized in that; Also comprise second filter that is arranged in the fuselage main body; This second filter is positioned at the back of ultrasonic wave sensing device, and outside flue gas through after the ultrasonic wave sensing device, arrives second filter at first.
5. the range hood with flue gas automatic detection device as claimed in claim 4 is characterized in that, described first filter is the metal filter screen of lattice-shaped, and described second filter is the intensive screen pack of being processed by material with carbon element.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010258979.4A CN102374562B (en) | 2010-08-17 | 2010-08-17 | There is the range hood of automatic flue gas detection device |
| EP11177262.0A EP2420742B1 (en) | 2010-08-17 | 2011-08-11 | Range hood having an automatic fume detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010258979.4A CN102374562B (en) | 2010-08-17 | 2010-08-17 | There is the range hood of automatic flue gas detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102374562A true CN102374562A (en) | 2012-03-14 |
| CN102374562B CN102374562B (en) | 2015-11-25 |
Family
ID=44677477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010258979.4A Expired - Fee Related CN102374562B (en) | 2010-08-17 | 2010-08-17 | There is the range hood of automatic flue gas detection device |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2420742B1 (en) |
| CN (1) | CN102374562B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594455A (en) * | 2019-09-25 | 2019-12-20 | 佛山市顺德区美的洗涤电器制造有限公司 | Check valve component and kitchen appliance |
| CN111174256A (en) * | 2020-01-20 | 2020-05-19 | 宁波舜韵电子有限公司 | Intelligent range hood |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106996586B (en) * | 2017-05-18 | 2023-07-28 | 浙江帅康电气股份有限公司 | Fresh air linkage controller and range hood using same |
| CN108167908B (en) * | 2018-03-07 | 2023-01-03 | 佛山市云米电器科技有限公司 | Range hood with induction type speed regulation function |
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| US5074281A (en) * | 1990-02-21 | 1991-12-24 | Diehl Gmbh & Co. | Circuit arrangement for the control of a ventilator |
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| EP1001226A2 (en) * | 1998-11-11 | 2000-05-17 | Diehl Controls Nürnberg GmbH & Co. KG | Ultrasonic sensor for smoke extracting hoods |
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| CN2416403Y (en) * | 1999-12-29 | 2001-01-24 | 台湾樱花股份有限公司 | Electric circuit apparatus for intelligent exhauster |
| US20020129809A1 (en) * | 1999-08-24 | 2002-09-19 | Frank Liese | Control or regulating device for a stove and method for control |
| US20070184771A1 (en) * | 2004-10-20 | 2007-08-09 | Henry Fluhrer | Ventilation device |
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| US3690245A (en) * | 1970-09-17 | 1972-09-12 | Panacon Corp | Range hood unit with fire safeguard fan control system |
| DE4243938A1 (en) * | 1992-12-23 | 1994-06-30 | Bosch Siemens Hausgeraete | Extractor hood |
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| US6415742B1 (en) * | 2000-07-03 | 2002-07-09 | Radio Systems Corporation | Dual transmitter pet confinement and training system |
| US6446624B1 (en) * | 2000-10-12 | 2002-09-10 | Taiwan Sakura Corporation | Smart circuit device of smoke exhauster for cooking |
| WO2007013187A1 (en) * | 2005-07-26 | 2007-02-01 | Watanabe Manufactory Company Limited | Range hood fan, and cooking gas collection and discharge method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5074281A (en) * | 1990-02-21 | 1991-12-24 | Diehl Gmbh & Co. | Circuit arrangement for the control of a ventilator |
| DE19510731C2 (en) * | 1994-08-22 | 1999-09-16 | Diehl Stiftung & Co | Ultrasonic path in narrow channels of housings |
| EP1001226A2 (en) * | 1998-11-11 | 2000-05-17 | Diehl Controls Nürnberg GmbH & Co. KG | Ultrasonic sensor for smoke extracting hoods |
| US6142142A (en) * | 1999-04-15 | 2000-11-07 | Vent-A-Hood | Method, apparatus and system for safely and efficiently controlling a ventilation hood |
| US20020129809A1 (en) * | 1999-08-24 | 2002-09-19 | Frank Liese | Control or regulating device for a stove and method for control |
| CN2416403Y (en) * | 1999-12-29 | 2001-01-24 | 台湾樱花股份有限公司 | Electric circuit apparatus for intelligent exhauster |
| US20070184771A1 (en) * | 2004-10-20 | 2007-08-09 | Henry Fluhrer | Ventilation device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594455A (en) * | 2019-09-25 | 2019-12-20 | 佛山市顺德区美的洗涤电器制造有限公司 | Check valve component and kitchen appliance |
| CN111174256A (en) * | 2020-01-20 | 2020-05-19 | 宁波舜韵电子有限公司 | Intelligent range hood |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102374562B (en) | 2015-11-25 |
| EP2420742B1 (en) | 2017-05-10 |
| EP2420742A1 (en) | 2012-02-22 |
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