CN107504536B - A kind of kitchen ventilator and its control method with reflective mist detecting device - Google Patents
A kind of kitchen ventilator and its control method with reflective mist detecting device Download PDFInfo
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- CN107504536B CN107504536B CN201710783095.2A CN201710783095A CN107504536B CN 107504536 B CN107504536 B CN 107504536B CN 201710783095 A CN201710783095 A CN 201710783095A CN 107504536 B CN107504536 B CN 107504536B
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- image
- reflecting mirror
- kitchen ventilator
- camera lens
- control unit
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Classifications
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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
There is the present invention kitchen ventilator of reflective optic mist detecting device can be avoided pollution of the smog to optical lens, the real-time and accuracy of detection can will not be reduced simultaneously, and calibrating installation can guarantee that the imaging sensor positioned at hood behind can obtain the smog image of hearth generation, and can prevent the interference of stray light.
Description
Technical field
The invention belongs to kitchen ventilator technical field more particularly to a kind of oil smoke detection devices of kitchen ventilator.
Background technique
The oil smoke in kitchen is always the problem for perplexing people, how accurately to detect the oil smoke generated when culinary art and and time control
It is kitchen ventilator improved direction always that liquefaction smoke machine, which takes oil smoke away,.The detection mode of kitchen ventilator is divided into particle detections, light at present
Learn detection or three kinds of sound detection.Particle type detection is by the particulate matter component in detection oil smoke, to judge depositing for oil smoke
And concentration, optical detection be to detect the presence of oil smoke to the absorption of detection light, reflex by oil smoke, and sound detection is
By the sound issued when detection culinary art, to judge the presence of oil smoke.These modes all Shortcomings, firstly, sound detection
Mode inaccuracy, it becomes difficult to distinguish the sound of culinary art and other noises of kitchen, can not accurate judgement oil smoke concentration；Particulate matter
Although the mode of detection is accurate, its testing principle determines that its sensor head must directly be contacted with oil smoke, and oil smoke is easy
It is deposited on sensor head in a short time and makes sensor failure；Optical detection mode its must also allow optical sensor just
To oil smoke, but optical sensor is most sensitive to polluting, and oil smoke can also deposit on optical sensor surface quickly, causes to pass
Sensor sensitivity decline even fail, and optical sensor do not allow yet it is easy to clean.It is existing in order to overcome the defect of the sensor
The top of draft hood is arranged in sensor by some part kitchen ventilators, such as China utility model CN200965283Y discloses one
The top of smoke exhaust ventilator 1 is arranged in kind automatic fume-extracting machine, photosensitive detector 2.Although design alleviates to a certain degree in this way
Pollution of the greasy dirt to sensor, also sacrifices the sensitivity of sensor, because leaning on the natural diffuseness of oil smoke to the top of smoke exhaust ventilator
Portion can just detect the generation of oil smoke, and the smog in kitchen is also very dense in fact, and the purpose of control oil smoke is also just not achieved, and
And oil smoke can condense on the camera lens of photosensitive detector, cause the pollution to optical instrument.
Summary of the invention
The present invention proposes optical smoke detection device and a kind of kitchen ventilator including the device on a kind of kitchen ventilator.
The optical smoke detection device includes optical smoke sensing unit, control unit, support adjustment mechanism, reflector element.It is described
Optical smoke sensing unit has imaging sensor, and described image sensor is preferably CCD or CMOS camera lens, described image sensing
The behind of the kitchen ventilator hood is arranged in device.
The front of described image sensor is arranged in the reflector element, and is at an angle to the horizontal surface, so that exhaust
The flue gas image that cover lower section generates can be reflected into the camera lens of imaging sensor by reflector element.The support adjustment mechanism
Including two horizontal support arms.Between two horizontal support arms have mounting plate, the both ends of the mounting plate respectively with two water
The both ends of flat support arm are hinged.The inside center of the mounting plate is equipped with universal joint, is equipped with reflecting mirror on the universal joint,
The reflecting mirror is enabled to carry out two-dimensional rotary relative to the horizontal plane of mounting plate.
Described image sensor is additionally provided with visual laser source, is used for the correction of mirror angle, and what is generated can
See that laser can be reflected on the hearth below hood or on cookware by reflecting mirror.
The kitchen ventilator also has control unit, and described control unit receives the image that described image sensor obtains, and
Smog generation is judged whether there is, if control unit judgement has smog generation, opens the exhaust fan of kitchen ventilator.
It is provided with hood in the horizontal support arms, the hood is by the two sides of imaging sensor and reflector element
It is blocked with top surface.
Described image sensor preferably includes CCD camera lens, and the camera lens includes zoom unit, and described control unit controls institute
Zoom unit is stated to realize the change to lens focus, is obtained to change the camera lens shared by acquired reflecting mirror image itself
Take the ratio of general image.The edge of the reflecting mirror is provided with identification band, and the identification band is square frame, and preferred color is
Black.
A kind of control method of kitchen ventilator mist detecting device is based on above-mentioned kitchen ventilator, comprising the following steps:
Step 1, described control unit control the zoom unit and the lens focus of imaging sensor are adjusted to minimum, so that
Ratio of the image of the reflecting mirror in the general image that camera lens obtains itself is minimum, and the visual field that imaging sensor obtains is most
Greatly.
Identification band is formed by the non-reflective region of black in step 2, identification acquired image, and calculates the black region
Area shared by general image ratio.
The ratio of step 3, the general image according to shared by proportionality coefficient calculating reflecting mirror image itself.
The ratio Q and preset threshold Q of general image shared by step 4, the image area by reflective mirror itself0It is compared,
If Q is greater than or equal to Q0, execute step 6；If Q is less than Q0, execute step 5；
Step 5, control unit adjust the zoom unit, increase the focal length of the camera lens, rear to execute step 2；
Reflecting mirror itself is formed by image in step 6, identification described image, judges whether there is smog generation.If there is
Smog generates, and described control unit opens the exhausting system of the kitchen ventilator.
There is the present invention kitchen ventilator of reflective optic mist detecting device can be avoided pollution of the smog to optical lens,
The real-time and accuracy of detection can will not be reduced simultaneously, and calibrating installation can guarantee the image positioned at hood behind
Sensor can obtain the smog image of hearth generation, and can prevent the interference of stray light.
Detailed description of the invention
Fig. 1 is kitchen ventilator entirety side view of the present invention；
Fig. 2 is optical smoke detection device top view of the present invention；
Fig. 3 is the imaging sensor front view of optical smoke detection device of the present invention；
Fig. 4 is reflecting mirror front view of the present invention；
Fig. 5 is the first mirror image that the image sensor of that present invention obtains；
Fig. 6 is the second mirror image that the image sensor of that present invention obtains.
Specific embodiment
With reference to the accompanying drawings of the specification and specific embodiment the present invention is described in detail.
In one embodiment, as shown in Figure 1, kitchen ventilator of the invention includes vertical (side suction) hood 2, hood 2
Top has flue 3, and the kitchen ventilator further includes that optical smoke detection device includes optical smoke sensing unit, specifically, institute
Optical smoke sensing unit is stated with imaging sensor 4, described image sensor 4 is preferably CCD or CMOS camera lens, described image
The behind of the kitchen ventilator hood is arranged in sensor 4, such as shown in Fig. 1, and the preceding table of flue 3 is arranged in imaging sensor 4
Face.The behind that kitchen ventilator hood is arranged in imaging sensor 4 is pollution for oil smoke to optical lens and dropped by the present invention
Low detection accuracy.
The optical smoke detection device further includes reflector element 6, and the reflector element 6 is arranged in described image sensor
4 front, and being at an angle to the horizontal surface, enables flue gas image caused by cookware 5 on 2 lower section hearth 1 of hood
Enough it is reflected into the camera lens of imaging sensor 4 by reflector element 6.The reflector element 6 supported by two horizontal support arms 7 and
It stretches out except hood 2, is stopped to avoid flue gas image by hood 2.
Fig. 2 is the top view of horizontal support arms 7 and reflector element 6.There is mounting plate 601 between two horizontal support arms 7,
The both ends of the mounting plate 601 are hinged with the both ends of two horizontal support arms 7 respectively, enable the mounting plate 601 along
The rotation of its axis.The inside center of the mounting plate 601 is equipped with universal joint 602, is equipped with reflecting mirror on the universal joint 602
603, enable the reflecting mirror 603 to carry out two-dimensional rotary relative to the horizontal plane of mounting plate 601.
In implementation process, user adjusts the angle of reflecting mirror 603 by universal joint 602, so that generating below hood 2
Flue gas image can be reflected by reflecting mirror 603 among the camera lens of imaging sensor 4.
In a more preferred embodiment, the side of the camera lens 402 of described image sensor is additionally provided with visual laser source
401 corrections (as shown in Figure 3) for mirror angle, the laser source can use existing small-power dot laser source, this
Field technical staff is appreciated that the position of the laser source should be as close as possible to the camera lens of imaging sensor, between the two
Distance is advisable less than 2cm.It is vented the switch of the settable laser source on skin plate, when user lights the laser source, is generated
Visible laser can be reflected by reflecting mirror 603 on the hearth of the lower section of hood 2 or on cookware, user can pass through tune at this time
The reflection angle that universal joint 602 adjusts reflecting mirror 603 is saved, when visible laser point is radiated on the center of hearth 1 or cookware 5, i.e. generation
The angle position of table reflecting mirror 603 is adjusted in place.Dotted line in Fig. 1 is reflected when laser light source is opened, reflection angle tune
Correction optical path after whole.
The kitchen ventilator also has control unit (not shown), and described control unit receives described image sensor 4
The image of acquisition, and smog generation is judged whether there is, if control unit judgement has smog generation, open the exhausting of kitchen ventilator
Machine.Further, the smokescope in image that described control unit judgement obtains, and exhausting is adjusted according to the smokescope
The power of machine.The judgment method of its smog image can also refer to the embodiment in Chinese patent CN102121906A, herein not
It repeats again.
In further embodiment, in order to improve the detection accuracy of described image sensing unit, and avoid environment miscellaneous
The interference of astigmatism, light spot in being formed on the mirror are provided with enclosed hood in the horizontal support arms 7, described
Hood blocks the two sides and top surface of imaging sensor 4 and reflector element 6.
In a further embodiment, described image sensor preferably includes CCD camera lens, and the camera lens includes zoom list
Member, described control unit control the zoom unit to realize the change to lens focus, to change acquired reflecting mirror sheet
The ratio of general image acquired in the camera lens shared by body image.For the above-mentioned reflecting mirror being at an angle to the horizontal surface, institute
Camera lens is stated to need accurately to obtain the smog image in reflecting mirror in visual field.In order to solve this problem, the reflecting mirror 603
Edge be provided with identification band 604, the frame as shown in figure 4, the identification band 604 is square, use color deep as far as possible, preferably
Color is black, surface roughness 1.6 or more, with guarantee light be radiated at the identification take to be formed diffusing reflection without
Generate specular light.When the camera lens of image sensing cell obtains the image of reflecting mirror and peripheral parts, identification band meeting
The non-reflective pattern for forming black in the picture, helps the edge of control unit perception reflex mirror, and only to the figure in reflecting mirror
As carrying out smog identification.In addition to this, the identification band may also help in reflecting mirror sheet in control unit change acquired image
Body image proportion.As shown, when the camera lens of imaging sensor obtains the image of reflecting mirror and peripheral parts, control
Unit handles the image of acquisition, due to identification band can form almost non-reflective black region on the image, due to
During lens zoom, identification band is formed by the ratio of the area of black region and the area of mirror image always not
Become, thus control unit by digital picture that CCD is obtained carry out pixel calculating can be obtained by identification band be formed by it is black
(image that CCD is obtained is digital picture to ratio of the color region in general image, and pixel is determined by CCD camera lens parameter itself
It is fixed), ratio of the area that can be obtained by mirror image in general image is calculated by conversion, such calculation method is not
Only convenient and efficient, since the image of mirror image and peripheral parts is difficult to differentiate between, identification needs complicated image algorithm, this
Calculating side in embodiment without the perception reflex mirror edge of image itself and calculates its area.At the same time, control unit is logical
It crosses the ratio by mirror image in general image to be compared with preset value, so that it may which whether the image that judgement currently obtains
For effective image.If ratio of the mirror image in general image is less than preset value, control unit judges the reflecting mirror
Ratio of the image in general image it is too small, and adjust the zoom unit, expand the mirror image in general image
In ratio.In order to avoid the toning of zoom unit, cause ratio of the mirror image in general image excessive even more than
The area of general image causes the image of reflecting mirror incomplete, and the zoom unit takes the mode of focal length step by step modulating.
The present invention also proposes a kind of control method of kitchen ventilator mist detecting device, based on the above embodiment in oil smoke
Machine, comprising the following steps:
Step 1, described control unit control the zoom unit and the lens focus of imaging sensor are adjusted to minimum, so that
Ratio of the image of the reflecting mirror in the general image that camera lens obtains itself is minimum, and the visual field that imaging sensor obtains is most
Greatly, as shown in figure 5, in order to avoid the excessive image for making reflecting mirror itself of the focal length of the camera lens of image acquisition unit exceeds camera lens
Visual field, described control unit controls the zoom unit and the lens focus of imaging sensor is adjusted to minimum, so that reflecting mirror
Ratio of the image of in general image itself is transferred to minimum, then gradually expands.
Identification band is formed by the non-reflective region of black in step 2, identification acquired image, and calculates the black region
Area shared by general image ratio.Since black identification band has certain roughness, the image acquired in camera lens
It is middle to can be obtained by by the calculating of simple pixel whole shared by its black region because of almost non-reflective formation black region
The ratio of image.
The ratio of step 3, the general image according to shared by proportionality coefficient calculating reflecting mirror image itself.Due in lens zoom
During, identification band is formed by the area of black region and the ratio of the image area of reflecting mirror itself is constant always,
Determine that area ratio is calculated by following formula by the width of size and black the identification band of reflecting mirror:
M=K × R；
Wherein K is proportionality coefficient, and a, b are respectively the length and width of reflective mirror, and c is the width for identifying band, and M is reflective mirror itself
Image area, R be identify band image area.
The ratio Q and preset threshold Q of general image shared by step 4, the image area by reflective mirror itself0It is compared,
If Q is greater than or equal to Q0, execute step 6；If Q is less than Q0, execute step 5；In a preferred embodiment, in order to enable control is single
Member can preferably identify smog image, Q0It should be set as between 0.8-0.9.
Step 5, control unit adjust the zoom unit, increase the focal length of the camera lens, rear to execute step 2；Preferred
Embodiment in, the step of adjustment focal length, takes the mode of stepping, such as can increase the camera lens maximum focal length every time
10% or 20%, to avoid the situation of a Focussing excess.After zoom, the clarity of image is adjusted by CCD camera lens
It is automatically performed, the mirror image after adjustment is as shown in Figure 6.
Reflecting mirror itself is formed by image in step 6, identification described image, judges whether there is smog generation.If there is
Smog generates, and described control unit opens the exhausting system of the kitchen ventilator.
The above is only the preferred embodiments of the disclosure, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, it is contemplated that change or replacement should all cover this
Within the protection scope of invention.
Claims (2)
1. a kind of kitchen ventilator with reflective mist detecting device, which is characterized in that the kitchen ventilator includes that optical smoke passes
Feel unit, control unit, support adjustment mechanism, reflector element, the optical smoke sensing unit has imaging sensor, described
The behind of the kitchen ventilator hood is arranged in imaging sensor；
The front of described image sensor is arranged in the reflector element, and is at an angle to the horizontal surface, so that under hood
The flue gas image just generated can be reflected into the camera lens of imaging sensor by reflector element；
Described control unit receives the image that described image sensor obtains, and judges whether there is smog generation, if control is single
Member judgement has smog generation, opens the exhaust fan of kitchen ventilator；The reflector element has reflecting mirror, and the reflecting mirror can turn
It is dynamic；
Described image sensor is additionally provided with visual laser source, is used for the correction of mirror angle, and what is generated is visible sharp
Light can be reflected on the hearth below hood or on cookware by reflecting mirror；
Described image sensor includes CCD camera lens, and the camera lens includes zoom unit, and described control unit controls the zoom list
Member is to realize the change to lens focus, to change overall diagram acquired in the camera lens shared by acquired reflecting mirror image itself
The ratio of picture, the edge of the reflecting mirror are provided with identification band.
2. a kind of control method of kitchen ventilator, the kitchen ventilator based on the claims 1, which is characterized in that the controlling party
Method the following steps are included:
Step 1, described control unit control the zoom unit and the lens focus of imaging sensor are adjusted to minimum, so that described
Ratio of the image of reflecting mirror in the general image that camera lens obtains itself is minimum, and the visual field that imaging sensor obtains is maximum；
Identification band is formed by the non-reflective region of black in step 2, identification acquired image, and calculates the face of the black region
The ratio of the shared general image of product；
The ratio of step 3, the general image according to shared by proportionality coefficient calculating reflecting mirror image itself；
The ratio Q and preset threshold Q of general image shared by step 4, the image area by reflective mirror itself0It is compared, if Q is big
In or equal to Q0, execute step 6；If Q is less than Q0, execute step 5；
Step 5, control unit adjust the zoom unit, increase the focal length of the camera lens, rear to execute step 2；
Reflecting mirror itself is formed by image in step 6, identification described image, smog generation is judged whether there is, if there is smog
It generates, described control unit opens the exhausting system of the kitchen ventilator.
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| CN201710783095.2A CN107504536B (en) | 2017-09-03 | 2017-09-03 | A kind of kitchen ventilator and its control method with reflective mist detecting device |
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| CN201710783095.2A CN107504536B (en) | 2017-09-03 | 2017-09-03 | A kind of kitchen ventilator and its control method with reflective mist detecting device |
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| CN107504536A CN107504536A (en) | 2017-12-22 |
| CN107504536B true CN107504536B (en) | 2019-05-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111122188A (en) * | 2018-10-30 | 2020-05-08 | 宁波方太厨具有限公司 | Device for collecting flue gas flowing condition on boiler side of stove and display method |
| CN110455750B (en) * | 2019-08-21 | 2023-03-03 | 京东方科技集团股份有限公司 | Mirror surface demisting method, mirror surface demisting device and intelligent mirror |
| JP7350308B2 (en) * | 2019-11-21 | 2023-09-26 | 株式会社パロマ | gas stove system |
| CN110907321A (en) * | 2019-12-05 | 2020-03-24 | 东莞理工学院 | Lampblack absorber oil smoke concentration visual detection system with visible light filtering function |
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Effective date of registration: 20190422 Address after: 312400 No. 68 Zhejiang Forging Road, Pukou Street, Shengzhou City, Shaoxing City, Zhejiang Province Applicant after: Zhejiang billion field intelligent kitchen and electricity Limited by Share Ltd Address before: 322000 Room 401, Unit 1, No. 11, 230 Lane, Fuzhou West Road, Yiwu City, Jinhua City, Zhejiang Province Applicant before: Wu Liankai |
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