CN114216145A - Fan cleaning device for range hood, range hood and control method - Google Patents

Fan cleaning device for range hood, range hood and control method Download PDF

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Publication number
CN114216145A
CN114216145A CN202111531211.4A CN202111531211A CN114216145A CN 114216145 A CN114216145 A CN 114216145A CN 202111531211 A CN202111531211 A CN 202111531211A CN 114216145 A CN114216145 A CN 114216145A
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detection
range hood
cleaning
mode
impeller
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CN114216145B (en
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韩国强
王发银
王亚男
张岩
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Ningbo Fotile Kitchen Ware Co Ltd
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Ningbo Fotile Kitchen Ware Co Ltd
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)

Abstract

The invention discloses a fan cleaning device for a range hood, the range hood and a control method, wherein the fan cleaning device comprises a fan system and a cleaning mechanism, the cleaning mechanism comprises a self-cleaning device for cleaning the fan system and an oil stain detection device, the fan system comprises a volute and an impeller arranged in the volute, and the oil stain detection device comprises a proximity switch for detecting the position of a blade of the impeller and a distance measurement sensor for detecting the thickness of oil stain on the blade; the proximity switch comprises a proximity sensing element fixed on one of the volute and the impeller and a proximity switch element fixed on the other of the volute and the impeller, the proximity sensing element can rotate with the impeller to a sensing range of the proximity switch element, and a blade corresponding to the position of the proximity switch element arranged on the impeller is used as a detection point; the distance measuring sensor is fixed relative to the volute so as to detect the distance between the distance measuring sensor and the detection point.

Description

Fan cleaning device for range hood, range hood and control method
Technical Field
The invention relates to an oil fume purification device, in particular to a fan cleaning device for a range hood, a range hood applying the fan cleaning device and a control method of the range hood.
Background
The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.
Due to the particularity of the kitchen environment, the oil smoke can be continuously attached to the surface of the impeller along with the superposition of the use time of the range hood, and if the range hood is not cleaned regularly, the performance of the range hood can be greatly reduced, so that the oil smoke absorption effect is influenced.
In the prior art, the adhesion degree of oil stains is mainly identified by detecting schemes such as the accumulated working time of the range hood, the current change of a main motor, the air quantity change of an air outlet, the weight increasing condition and the like, so that a user is reminded to clean or control a self-cleaning device to clean.
The accumulated working time length is detected by timing and resetting after cleaning is finished every time, starting the range hood to time, closing the range hood to stop timing, and gradually accumulating the running time of the range hood until the accumulated working time length reaches a threshold value to send out a cleaning prompt. The accumulated time of the scheme cannot accurately reflect the accumulation of oil stains, the generated oil smoke amount is different due to different cooking habits, the oil stains accumulated by the cooking mode with large oil smoke amount are more than those accumulated by the cooking mode with small oil smoke amount in the same time, and the accumulation of the oil stains can be influenced by the filtering capacity of the front-end oil screen.
The current of the main motor is detected by reflecting the weight increasing condition of the impeller according to the change of the current, the impeller can be increased in weight due to oil accumulation, the load of the motor is increased, the current of the motor can be increased to ensure the balance between output and load, and when the current is increased to reach a threshold value, a cleaning prompt is sent. The solution has the drawback that the variations in current are related to the variations in load, which, in addition to the adhesion of the oil, are also related to the flue resistance, the friction of the rotor of the motor itself. The flue resistance is increased, the load is increased, the current of the motor is increased, and the friction of a rotor bearing of the motor is increased along with the increase of the service time, so that the current is changed.
The air quantity of the air outlet is detected by reflecting the attachment degree of the oil stain of the impeller according to the change of the air quantity, and the air quantity is influenced by a plurality of factors including flue resistance, the blockage degree of a front filter screen, the change of the performance of a motor, the ventilation degree of a kitchen and the like in the same reason, so that the attachment amount of the oil stain cannot be accurately reflected.
The detection of the weight increase condition is to detect the increase of oil stain through the weighing sensor, and the motor impeller is fixed in on the spiral case, and it weighs including the weight of spiral case, and the oil stain of impeller can be got rid of on the spiral case because of the effect of centrifugal force in the operation process, what the weight increase sensor detected when reaching the threshold value is the oil stain total amount of impeller and spiral case, and the majority is the oil stain on the spiral case, can not accurately reflect the viscous oil volume of impeller, can appear the wrong report even.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a fan cleaning device to improve the accuracy of oil stain detection of the impeller, aiming at the defects in the prior art.
The second technical problem to be solved by the invention is to provide a range hood with the fan cleaning device.
The third technical problem to be solved by the invention is to provide a method for detecting the pollution degree of the range hood.
The fourth technical problem to be solved by the invention is to provide a cleaning reminding method for the range hood.
The fifth technical problem to be solved by the invention is to provide a cleaning strength matching method of the range hood.
The sixth technical problem to be solved by the present invention is to provide an active cleaning control method for the above range hood.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a fan cleaning device for range hood, includes fan system and clean mechanism, clean mechanism is including being used for clean fan system's automatically cleaning device and greasy dirt detection device, fan system includes the spiral case and sets up the impeller in the spiral case, the impeller includes two at least blades, its characterized in that:
the oil stain detection device comprises a proximity switch for detecting the position of the blade and a distance measurement sensor for detecting the thickness of oil stain on the blade;
the proximity switch comprises a proximity sensing element fixed on one of the volute and the impeller and a proximity switch element fixed on the other of the volute and the impeller, the proximity sensing element can rotate with the impeller to a sensing range of the proximity switch element, and a blade corresponding to the position of the proximity switch element arranged on the impeller is used as a detection point;
the distance measuring sensor is fixed relative to the volute so as to detect the distance between the distance measuring sensor and the detection point.
In order to make the distance detection more accurate, the proximity switch elements arranged on the impeller have at least two and are evenly spaced in the circumferential direction of the impeller.
Preferably, the proximity switch is a magnetic sensitive switch.
More preferably, the proximity sensing element is a magnet, the proximity switch element is a hall sensor, the magnet is arranged on the impeller, and the hall sensor is arranged on the volute.
In order to control the distance measuring sensor and the proximity switch conveniently, the oil stain detection device further comprises a control module, the control module comprises a central processing unit, the distance measuring sensor and the proximity switch element are respectively and electrically connected with the central processing unit, and the distance measuring sensor and the proximity switch element are respectively controlled by the central processing unit and can input detected data to an input end of the central processing unit.
To facilitate control of the cleaning mode, the control module further comprises a first timing unit.
The technical scheme adopted by the invention for solving the second technical problem is as follows: a range hood, its characterized in that: the fan cleaning device for the range hood as described above is applied.
The technical scheme adopted by the invention for solving the third technical problem is as follows: a method for detecting the pollution degree of a range hood is characterized in that: the range hood is provided with the fan cleaning device, and the detection method comprises the following steps:
1) starting an oil stain detection device, reducing the rotating speed of an impeller, and entering a detection mode;
2) when entering a detection mode, the proximity switch element starts to receive signals until a proximity sensing element is sensed, the proximity switch element generates signals and inputs the signals to the central processing unit, and a blade corresponding to the distance measuring sensor is one detection point at present, and then the method enters a step 3);
3) the central processing unit controls the distance measuring sensor to detect and record the distance between the current detection point position and the distance measuring sensor; then the impeller continues to rotate, enters the next detection point position, detects the distance between the current detection point position and the distance measurement sensor and records the distance; until the impeller rotates for a circle, respectively measuring the distance value corresponding to each detection point;
4) comparing the distance value obtained by each detection point under the current detection mode with a reference value to obtain the oil stain thickness of each detection point; when the current detection mode is detection performed when the range hood does not enter the cleaning mode, the reference value refers to an average value of distance values corresponding to detection points when the range hood is not in a blade pollution-free state; when the detection mode is detection after the range hood enters the cleaning mode, the reference value is the mean value of the distance values corresponding to the detection points detected for the first time after cleaning;
5) the detection thickness value D obtained in the detection mode is obtained through the oil stain thickness of each detection point, and the current pollution degree K obtained through calculation of the central processing unit 223 is as follows:
Figure BDA0003410826330000031
and S is a preset oil stain thickness threshold value.
Preferably, in step 4), if the range hood is not operated, S0iThe distance value is obtained when the blade enters a detection mode under an uncontaminated state.
According to an embodiment of the present invention, in step 5), the manner of obtaining the detected thickness value D obtained in the present detection mode through the thickness of the oil stain at each detection point is as follows: and averaging the oil stain thicknesses of all detection points to obtain an average oil stain thickness S' serving as a detection thickness value D.
According to another embodiment of the invention, in the step 5), the manner of obtaining the detected thickness value D obtained in the present detection mode through the oil stain thickness of each detection point position is as follows: taking the maximum value delta S of the oil stain thickness of each detection pointmaxAnd an average value S'; if Δ S is satisfiedmaxif-S' is less than or equal to aS, then taking Delta SmaxFor this detection of the thickness value D, if delta S is satisfiedmaxIf S 'is more than aS, taking S' aS the thickness value D of the detection; where a is a constant.
According to another embodiment of the invention, in the step 5), the manner of obtaining the detected thickness value D obtained in the present detection mode through the oil stain thickness of each detection point position is as follows: and removing abnormal values of the oil stain thickness of each detection point, then averaging the residual oil stain thickness values, and taking the average value as the detection thickness value D.
According to another embodiment of the present invention, the distance measuring sensor is disposed in the impeller, and the detecting direction of the distance measuring sensor is the radial direction of the blade corresponding to the current detecting point, in step 3), after one rotation of the impeller, the distance value S corresponding to each detecting point is respectively measured1iI is the number of the detection point location; in step 4), the reference value and the distance value S obtained in the current detection mode are compared1iSubtracting to obtain the oil stain thickness delta S of each detection pointi。
According to an embodiment of the present invention, the oil stain thickness is obtained by that an included angle between the detection direction of the distance measuring sensor and the axial direction of the impeller is α, and in step 3), after one rotation of the impeller, the distance value S corresponding to each detection point position is measured respectively1i', i is the number of the detection point location; in step 4), the reference value and the distance value obtained in the current detection mode are used for obtaining S1i', obtaining the oil stain thickness Delta S of each detection pointi' hsin alpha, where h is a reference value-S1i′。
According to another embodiment of the present invention, the oil stain thickness is obtained by that an included angle between the detection direction of the distance measuring sensor and the radial direction of the current detection point is β, and in step 3), after one rotation of the impeller, the distance value S corresponding to each detection point is measured respectively1i", i is the number of the detection point location; in step 4), the reference value and the distance value obtained in the current detection mode are used for obtaining S1iObtaining the oil stain thickness of each detection point
Figure BDA0003410826330000041
Where h ═ reference value-S1iAnd R is the radius of the blade.
According to another embodiment of the present invention, the oil stain thickness is obtained by setting an included angle between the detection direction of the distance measuring sensor and the axial direction of the impeller to α, setting an included angle between the detection direction of the distance measuring sensor and the radial direction of the current detection point to β, and in step 3), after one rotation of the impeller, respectively measuring the distance value S corresponding to each detection point1i", i is the number of the detection point location; in step 4), the reference value and the distance value obtained in the current detection mode are used for obtaining S1i' obtaining the oil stain thickness of each detection point position
Figure BDA0003410826330000042
Where h ″, is the reference value-S1i", R is the radius of the blade.
The technical scheme adopted by the invention for solving the fourth technical problem is as follows: a cleaning reminding method of a range hood is characterized in that: the range hood is provided with the fan cleaning device, and the cleaning reminding method comprises the following steps:
1) obtaining the current K by adopting the pollution degree detection method;
2) and displaying the current K on a control panel of the range hood.
The first technical solution adopted by the present invention to solve the fifth technical problem is: a cleaning strength matching method of a range hood is characterized in that: the range hood is provided with the fan cleaning device, and the pollution degree detection method is adopted for detecting the pollution degree;
the cleaning intensity matching method comprises the following steps:
1) firstly, the range hood runs and oil stains are accumulated;
2) carrying out pollution degree detection, starting timing by the first timing unit at the same time, resetting the first timing unit until pollution degree detection is carried out again, and recording the last timing data in the storage unit; with the continuous detection of the pollution degree, the first timing unit is continuously reset, and the last timing data tjContinuously overlapping and recording the data in a storage unit, wherein j is the reset number count; when the detected K is more than or equal to 100 percent, entering the step 3), and if not, entering the step 8);
3) calculating the accumulated time length T:
Figure BDA0003410826330000051
where n2 is the total number of resets;
4) reading a predetermined time threshold T0And judging that T is more than or equal to T0If yes, the central processing unit outputs a control signal to control the self-cleaning device to clean in a first mode, and the step 5) is carried out; if not, controlling the self-cleaning device to clean in a second mode, wherein the cleaning intensity of the first mode is greater than that of the second mode, and entering the step 5);
5) when cleaning is carried out in the first mode or the second mode, every certain cleaning time, pollution degree detection is carried out to obtain the current K, when the currently obtained K is lower than a certain proportion, cleaning is stopped, and the self-cleaning device is closed;
6) then carrying out primary pollution degree detection, and setting the K obtained after detection to zero;
7) the first timing unit restarts timing, the accumulated time T of the storage unit is set to zero, and the next trigger is waited;
8) and (5) closing the fan system and ending.
The first technical solution adopted by the present invention to solve the sixth technical problem is: an active cleaning control method of a range hood is characterized in that: the range hood is provided with the fan cleaning device, the fan cleaning device has two cleaning modes, namely a first mode and a second mode, and the cleaning intensity of the first mode is greater than that of the second mode; detecting the pollution degree by adopting the pollution degree detection method;
the active cleaning control method comprises the following steps:
1) when the first timing unit starts to time for a time exceeding a certain time, the central processing unit is triggered, and the oil stain detection device is started to detect the pollution degree;
2) judging whether the currently detected K exceeds a preset degree, if so, starting a second mode for cleaning, and entering a step 3); if not, ending;
3) cleaning for a certain time by adopting a second mode, detecting the pollution degree again to obtain the current K, wherein the reference value is the distance detected when the blades are not polluted; when the currently obtained K is lower than a certain proportion, stopping cleaning and closing the self-cleaning device;
4) then carrying out primary pollution degree detection, and setting the K obtained after detection to zero;
5) the first timing unit times again, the accumulated duration obtained by the addition of the single timing recorded during each resetting of the first timing unit is set to zero, and the next triggering is waited; and simultaneously closing the fan system and ending.
The second technical solution adopted by the present invention to solve the fifth technical problem is: a cleaning strength matching method of a range hood is characterized in that: the range hood is provided with the fan cleaning device, the control module of the range hood further comprises a second timing unit for timing when the range hood is started, and the pollution degree detection is carried out by adopting the pollution degree detection method;
the cleaning intensity matching method comprises the following steps:
1) when the range hood starts to operate, the second timing unit starts to time at the same time;
2) after the use, the range hood is closed, the second timing unit is reset to zero, and the last timing data is recorded; the second timing unit is continuously reset along with the continuous use of the range hood, and the last timing data tj′'continuously overlapping for recording, wherein j' is the reset count; when the detected K is more than or equal to 100 percent, entering the step 3), and if not, entering the step 8);
3) calculating the accumulated time length T':
Figure BDA0003410826330000061
where n 2' is the total number of resets;
4) reading a predetermined time threshold T0', judging that T' is not less than T0If yes, the central processing unit outputs a control signal to control the self-cleaning device to clean in a first mode, and the step 5) is entered; if not, controlling the self-cleaning device to clean in a second mode, wherein the cleaning intensity of the first mode is greater than that of the second mode, and entering the step 5);
5) when cleaning is carried out in the first mode or the second mode, every certain cleaning time, pollution degree detection is carried out to obtain the current K, when the currently obtained K is lower than a certain proportion, cleaning is stopped, and the self-cleaning device is closed;
6) then carrying out primary pollution degree detection, and setting the K obtained after detection to zero;
7) the second timing unit restarts timing, and the recorded T' is set to zero to wait for the next trigger;
8) and (6) ending.
The second technical solution adopted by the present invention to solve the sixth technical problem is: an active cleaning control method of a range hood is characterized in that: the range hood is provided with the fan cleaning device, the control module of the range hood further comprises a third timing unit for timing when the range hood is closed, the fan cleaning device has two cleaning modes, namely a first mode and a second mode, and the cleaning intensity of the first mode is greater than that of the second mode; detecting the pollution degree by adopting the pollution degree detection method;
the active cleaning control method comprises the following steps:
1) when the range hood is closed, the third timing unit starts to time, and when the range hood is started next time, the third timing unit is reset to zero; along with the prolonging of the shutdown time of the range hood, when the third timing unit (227) times for more than a certain time once, the central processing unit is triggered, and the oil stain detection device is started to detect the pollution degree;
2) judging whether the currently detected K exceeds a preset degree, if so, starting a second mode for cleaning, and entering a step 3); if not, ending;
3) cleaning for a certain time by adopting a second mode, detecting the pollution degree again to obtain the current K, wherein the reference value is the distance detected when the blades are not polluted; when the currently obtained K is lower than a certain proportion, stopping cleaning and closing the self-cleaning device;
4) then carrying out primary pollution degree detection, and setting the K obtained after detection to zero;
5) and the fan system is closed, the third timing unit times again and waits for the next trigger.
Compared with the prior art, the invention has the advantages that: the pollution degree of the impeller is reflected by detecting the thickness of the oil stain on the blade, the adopted mode is direct detection, no intermediate conversion link exists, the influence of flue pressure, motor performance, filter screen airflow and user use habits is avoided, the detection is more accurate, and the actual working condition of the impeller can be reflected better; the oil stain thickness is detected by at least two points, the average level of impeller pollution is reflected by selecting an average value or a maximum value and an average value on the premise of preventing false alarm, and measurement deviation and fluctuation caused by local accumulation of oil stains when the impeller is in a standing state are prevented; the impeller pollution degree shows the adopted relative value, namely the result after the previous cleaning is taken as an initial value, so that the pollution degree is calculated from zero after the cleaning; the cleaning control process has real-time data feedback, and the absolute value of the pollution degree of the impeller is used as monitoring data, namely the position of a blade before the impeller leaves a factory is used as an initial value, so that the thoroughness of oil stain cleaning is ensured, and the accumulation phenomenon cannot occur; the cleaning process can judge the user's use habit according to long accumulated time in order to match the cleaning pattern of different intensity, when guaranteeing clean, protects motor impeller life as far as possible, extension complete machine life.
Drawings
Fig. 1 is a schematic view of a range hood according to a first embodiment of the present invention;
fig. 2 is a sectional view of a range hood according to a first embodiment of the present invention;
FIG. 3 is a schematic view of a fan cleaning apparatus according to a first embodiment of the present invention;
FIG. 4 is a schematic view of a hidden air inlet ring of a fan cleaning device according to a first embodiment of the present invention;
fig. 5 is a schematic block diagram of an oil contamination detecting apparatus of the fan cleaning apparatus according to the first embodiment of the present invention;
fig. 6 is a flow chart of a warning control of the fan cleaning apparatus according to the first embodiment of the present invention;
fig. 7 is a flowchart of cleaning intensity matching control of the fan cleaning apparatus according to the first embodiment of the present invention;
FIG. 8 is a flow chart illustrating active cleaning control of the fan cleaning apparatus according to the first embodiment of the present invention;
FIG. 9 is a partial sectional view of a distance measuring sensor and a vane of an impeller according to a second embodiment of the present invention, taken along an axial direction of the impeller;
fig. 10 is a partial sectional view of a ranging sensor and a vane of an impeller according to a third embodiment of the present invention, taken along a radial direction of the impeller.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Example one
Referring to fig. 1 to 4, a range hood includes a housing 100 and a fan cleaning device disposed in the housing 100, the fan cleaning device includes a fan system 1 and a cleaning mechanism 2, the fan system 1 is a centrifugal fan, and in this embodiment, the fan system 1 is applied to the range hood.
The fan system 1 includes a volute 11, an impeller 12 disposed within the volute 11, and a motor (not shown) for driving the impeller 12 to rotate. The volute 11 includes two cover plates 111 arranged at intervals and a circumferential wall 112 located between the two cover plates 111, an air inlet 113 is opened on the cover plate 111, and an air inlet ring 114 is provided at the air inlet 113. The fan system 1 can be single air inlet or double air inlet. The impeller 12 includes two end rings 122 arranged at intervals and blades 121 located between the two end rings 122, and the blades 121 have at least two and are arranged at intervals in the circumferential direction (the circumferential direction of the end rings 122). The structure of the fan system 1 is the same as that of the prior art, and is not described herein again.
The cleaning mechanism 2 includes a self-cleaning device 21 and an oil contamination detecting device, which can display and remind on a control panel of the casing 100 when the oil contamination detecting device detects that the impeller 12 needs to be cleaned. If the pollution level of the impeller 12 is displayed on the control panel, the display can be performed in various manners such as digital display, aperture color change, area filling and the like, and the display numerical value is displayed in a percentage manner by taking the digital display as an example.
The oil stain detection device comprises a distance measurement sensor 221, a Hall sensor 222 and a control module, wherein the control module comprises a central processing unit 223, a first timing unit 224 and a storage unit 225, the distance measurement sensor 221, the Hall sensor 222 and the first timing unit 224 are respectively and electrically connected with the central processing unit 223, the distance measurement sensor 221 and the Hall sensor 222 are respectively controlled by the central processing unit 223 and can input detected data to the input end of the central processing unit 223, the central processing unit 223 and the storage unit 225 are in two-way communication, and the central processing unit 223 can store the data in the storage unit 225 and can also read the data from the storage unit 225, see fig. 5.
The hall sensor 222 is installed on the volute 11, located at the air inlet 111, and located on one side of the air inlet ring 114 facing the inside of the volute 11, the position of the hall sensor 222 corresponds to the impeller 12, and the hall sensor 222 is perpendicular to the impeller 12 and points to the impeller 12. The end ring 122 of the impeller 12 near the air inlet 113 is provided with a magnet 227, and the magnet 227 is located in the sensing range of the hall sensor 222. The magnets 227 are at least two, in this embodiment 6, and are evenly spaced along the circumference to ensure that the detection of the position of the blade 121 is accomplished without affecting the dynamic balance of the impeller 12.
Alternatively, the hall element can be replaced by another magneto-sensitive element, such as a magneto-resistor, an induction coil, or the like. The detection of the position of the blade 121 may also be accomplished with other proximity switches, such as a photosensor, inductive proximity switch, capacitive proximity switch, and the like. One of the proximity sensing element (e.g., the magnet 227) and the proximity switch element (e.g., the hall sensor 222) of the proximity switch is fixedly disposed on the scroll casing 11, and the other of the proximity sensing element (e.g., the magnet 227) and the proximity switch element (e.g., the hall sensor 222) of the proximity switch has at least two, corresponds to different blades 121, and is uniformly spaced apart.
The distance measuring sensor 221 is located inside the impeller 12 and is fixedly connected to the volute 11, and preferably to the cover plate 111. The detection direction, i.e. the installation angle, of the distance measuring sensor 221 is perpendicular to the blade 121 (radially and same direction as the blade 121) and is directed to the blade 121, so as to measure the radial thickness variation (different oil accumulation degrees and different radial thicknesses) of the blade 121. Preferably, in the present embodiment, the distance measuring sensor 221 is an ultrasonic sensor. Alternatively, an optical sensor such as an infrared distance measuring sensor, a laser distance measuring sensor, or a micro radar distance measuring sensor may be used.
In the use process of the range hood, the oil stain detection device is not started, after the range hood is used, the shutdown is delayed, the oil stain detection device is started, and the rotating speed of the impeller 12 is reduced to enter a detection mode. Starting a primary detection mode before formal use of the cleaning reminding function, detecting the average distance from the ranging sensor 221 to the blade 121 when the blade 121 is not polluted, when the detection mode is started, the Hall sensor 222 starts to receive signals until magnetism is sensed, the Hall sensor 222 generates a high level indicating that the current position is a preset detection point position, the high level is input into the central processing unit 223, and the central processing unit 223 sends out a detection signal to enable the ranging sensor 221 to detect the distance S between the current blade 121 (the blade 121 corresponding to the currently sensed position of the magnet 227) and the ranging sensor 2211And recorded in the storage unit 225, and the impeller 12 continues to rotate until the next detection point, that is, the circumferentially adjacent magnet 227 rotates to be sensed by the hall sensorThe distance measuring sensor 221 detects the current distance as S from the position sensed by the sensor 2222And recorded in the storage unit 225; until the impeller 12 rotates for one circle, the distance values S of 6 point positions are respectively measurediI is the number of the detection point position, i.e. the blade 121 arranged on the magnet 227; the average distance S from the blade 121 to the distance measuring sensor 221 when the initial impeller 12 is not contaminated is calculated by the central processing unit 2230Comprises the following steps:
Figure BDA0003410826330000091
n1 is the number of detection points, 6 in this embodiment, and S is calculated0As an initial distance, is permanently recorded in the storage unit 225 and used as a reference value.
When the user uses, the pollution degree that the range hood shows before using and in the use is the numerical value that range hood detected last time, and after using, the shutdown, range hood get into detection mode (hereinafter, detection mode all indicates pollution degree K detection mode), specifically, pollution degree K detection method includes following flow, refers to fig. 6:
1) starting the oil stain detection device, reducing the rotating speed of the impeller 12, and entering a detection mode;
2) when entering the detection mode, the hall sensor 222 starts to receive signals until the magnetism of the magnet 227 is sensed, the hall sensor 222 generates a high level, which indicates that the blade 121 corresponding to the distance measuring sensor 221 is currently one of the detection point positions, and the high level is input to the central processing unit 223, and the step 3) is performed;
3) the central processing unit 223 controls (sends out a detection signal to prompt) the ranging sensor 221 to detect the distance S between the current blade 121 and the ranging sensor 22111And recorded in the storage unit 225, the impeller 12 continues to rotate and enters the next detection point, and it is detected that the distance between the current detection point and the distance measuring sensor 221 is S12And recorded in the storage unit 225; until the impeller 12 rotates for one circle, the distance values S of 6 point positions are respectively measured1iI is the number of the detection point location;
4) s of distance value obtained by each detection point under the current detection mode1iSubtracting the reference value to obtain the oil stain thickness delta S of each detection pointi(ii) a When the current detection mode is the first detection (detection without entering the cleaning mode) after the range hood is used, the reference value is S0(ii) a When the current detection mode is detection after entering the cleaning mode, the reference value is the mean value S of the distance values corresponding to the detection points detected for the first time after cleaning0'; the values of the current detection point location and the previous detection point location cannot be in one-to-one correspondence, so the reference value adopts an average value;
5) the average oil stain thickness S' of each detection point location calculated by the central processing unit 223 is:
Figure BDA0003410826330000101
6) taking the average oil stain thickness S' obtained in the detection mode as the detection thickness value D and the preset oil stain thickness threshold value S, and calculating by the central processing unit 223 to obtain the current pollution degree K as:
Figure BDA0003410826330000102
until this step, the detection of the contamination level K is completed.
The calculated pollution degree K is displayed on the control panel, so that the user can know the current pollution degree of the blade 121, and the effect of cleaning and reminding is achieved. When the degree of contamination K approaches 100%, the user is reminded to clean or the self-cleaning device 21 is activated to clean. The control panel may include various display modes such as digital display, color change of aperture, and area filling, etc. to remind the user to perform manual cleaning or start the self-cleaning device 21 when cleaning is needed.
In the above embodiment, the oil stain thickness Δ SiThe average value of n1 points is used as the final detected thickness value D, and the main purpose is to obtain a detection resultAnd accuracy is improved, and false triggering caused by local thickness difference is avoided. Alternatively, a detection mode may be adopted in which the detection points are still axisymmetrically distributed multiple points, for example, 6 points, and the detected distances are S respectively1、S2、S3……Sn1The maximum value and the average value of the detected thicknesses of the n1 detection points are respectively delta SmaxAnd S'. If Δ S is satisfiedmax-S' is ≦ aS, S being a preset thickness threshold. Then take Δ SmaxThe detected thickness value D is equal to the average thickness of the original embodiment; if not, Δ SmaxAnd S 'is more than aS, taking the average oil stain thickness S' aS the detection thickness value D. Wherein a is a constant coefficient, and the preferable value range is 5-10%, and more preferably 5%.
Compared with an average value method, the method for obtaining the thickness of the oil stain has better effect, and can ensure that the maximum thickness is used as a detection value on the basis of the average value method, so that the timeliness of cleaning is ensured.
In addition, abnormal values can be removed from the n1 oil stain thickness values obtained through detection, then the residual parameters are averaged, the abnormal values are defined as +/-10% of the median value, and if the abnormal values are out of the range, the abnormal values are removed, and the residual values are averaged to serve as the thickness value D detected at this time.
When the distance sensor 221 first detects the distance to the current blade 121, the first timing unit 224 simultaneously starts timing until the detection is performed again, the first timing unit 224 is reset, and the last timing data is recorded in the storage unit 225. Along with continuous use, the first timing unit 224 is continuously reset, the last timing data is continuously superposed and recorded in the storage unit 225, oil stains are gradually accumulated along with the continuous use of the range hood, when the pollution degree K is larger than or equal to 100%, a user is reminded of needing to clean the impeller, and the user starts the self-cleaning device to clean.
The cleaning strength is selected based on the principle that users with large oil smoke amount can reach cleaning conditions in a short time due to different cooking habits, users with small oil smoke amount can reach the cleaning conditions in a long time, and oil stains can be retained on the surfaces of blades of the impeller for a long time to cause the oil stains to be cured, so that a cleaning mode with high strength needs to be matched; on the contrary, the cleaning condition is achieved in a short time, the oil stain is solidified to a low degree and is relatively easy to peel, so that the oil stain can be cleaned only by a cleaning mode with general intensity.
Specifically, the cleaning intensity matching control flow is shown in fig. 7:
1) firstly, the range hood runs and oil stains are accumulated;
2) the pollution degree K is detected by the pollution degree K detection method, the first timing unit 224 starts timing at the same time, until the detection is performed again, the first timing unit 224 is reset, and the last timing data is recorded in the storage unit 225; with the contamination level detection being performed continuously, the first timing unit 224 is reset continuously, and the last timing data t is obtainedjContinuously and overlappingly recorded in the storage unit 225, wherein j is the reset number count; gradually accumulating oil stains along with the continuous use of the range hood, and entering step 3) when the pollution degree K is more than or equal to 100 percent, and entering step 8) if not;
3) calculating the accumulated time length T:
Figure BDA0003410826330000111
where n2 is the total number of resets, equal to j for the last time;
4) reading a predetermined time threshold T0And judging that T is more than or equal to T0If yes, the oil accumulation period process of the user is described, and the stubborn degree of the oil is high, so that the central processing unit 223 outputs a control signal to control the self-cleaning device 21 to clean in the first mode, and the step 5) is carried out; if not, controlling the self-cleaning device 21 to clean in the second mode, and entering step 5); the first mode is usually a powerful mode, the second mode is usually a general mode, and the cleaning time, the cleaning pressure and other cleaning intensity of the powerful mode are all larger than those of the general mode;
5) when cleaning is performed in the first mode or the second mode, the detection mode is performed every certain cleaning time, for example, two minutes, and the current contamination level K is detected, considering that the cleaning apparatus cannot be completely cleaned, so when the contamination level K is lower than a certain ratio, for example, 2%, cleaning is stopped, and the self-cleaning apparatus 21 is turned off;
6) then, automatically detecting the pollution degree K for one time, setting the pollution degree K to zero after detection, setting the K obtained after detection to zero, and using the S' obtained this time as a reference value in the next detection mode;
7) the first timing unit 224 restarts timing, and the storage unit 225 sets the accumulated time length T to zero to wait for the next trigger; entering step 8);
8) and (5) closing the fan system 1 and ending.
The initial distance S used to detect the degree of contamination K when running to step 2) for the first time0Is the initial distance S at which the blade 121 is not contaminated initially0This ensures that the oil stains that are not completely cleaned by the blades 121 do not accumulate; when the operation is carried out to the step 6) and the operation is carried out to the step 2) again, the average distance S' detected in the last detection mode is used as the reference value S0' calculation is performed.
In the cleaning process, the absolute pollution degree of the detection is displayed on the control panel and used for feeding back the cleaning progress in real time, and in the working mode, the relative pollution degree is displayed, so that the experience of a user is improved. In addition, the oil stain can be solidified under the condition that the cigarette machine is not used for a long time after being used for a period of time, so that after the pollution of the impeller reaches a certain degree, when the cigarette machine is detected to be not started for a plurality of continuous days, the self-cleaning device is automatically started to clean. After using a period of time, the long-term condition of not using appears, the single timing of first timing unit 224 can be constantly increased, until first timing unit 224 single timing exceeds a certain period, for example 10 days, trigger central processing unit 223 and judge current relative pollution degree, if current pollution degree K exceeds a certain degree, for example 20%, then automatic trigger cleaning device cleans, the cleaning process is the same with above cleaning mode, cleaning intensity adopts general intensity, only two pieces of single timing and pollution degree satisfy simultaneously and just promote automatic cleaning, other conditions are the same with daily mode. Specifically, the active cleaning control flow is shown in fig. 8:
1) when the first timing unit 224 starts to time for a single time exceeding a certain time, for example, 10 days, the central processing unit 223 is triggered to start the oil stain detection device, and the oil stain detection device enters a detection mode;
2) judging whether the currently detected pollution degree K exceeds a preset degree, if so, starting a second mode for cleaning, and entering a step 3); if not, ending;
3) cleaning for a certain time period in a second mode, e.g. two minutes, detecting the current absolute contamination level K (using the initial distance S obtained in the uncontaminated state0Performing a calculation); considering that the cleaning device cannot be completely cleaned, when the degree of contamination K is below a certain ratio, such as 2%, the cleaning is stopped and the self-cleaning device 21 is turned off;
4) then automatically detecting the pollution degree K once again, setting the pollution degree K to zero after detection, and using the S' obtained this time as the initial distance S in the next detection mode0；
5) The first timing unit 224 counts time again, and the accumulated time length of the storage unit 225 is set to zero to wait for the next trigger; and simultaneously closing the fan system 1 and ending.
In the above embodiment, the cleaning intensity matching is performed using the entire cleaning interval time as the judgment condition. Alternatively, the accumulated running time of the range hood can be used as a judgment value for cleaning intensity matching, the second timing unit 226 is started for timing each time, the second timing unit 226 is set to zero after use, and the last timing value is stored and accumulated; finally, according to the accumulated running time T' and the corresponding set threshold value T0' comparison to match the corresponding cleaning mode, the judgment condition is the same as the original embodiment, the difference is T0' the set point is much smaller than in the previous embodiment, e.g. T0' setting value is about 30 hours, original example T0The set value is about 30 days.
Specifically, the method comprises the following steps:
1) when the range hood starts to operate, the second timing unit 226 starts to time at the same time;
2) after the use, the range hood is closed, the second timing unit 226 is reset to zero, and the last timing data is recorded; with the continuous use of the range hood, the second timing unit 226 is continuously reset, and the last timing data t is obtainedj′'continuously overlapping for recording, wherein j' is the reset count; when the detected K is more than or equal to 100 percent, entering the step 3), and if not, entering the step 8);
3) calculating the accumulated time length T':
Figure BDA0003410826330000121
where n 2' is the total number of resets;
4) reading a predetermined time threshold T0', judging that T' is not less than T0If yes, the central processing unit 223 outputs a control signal to control the self-cleaning device 21 to perform cleaning in the first mode, and then the step 5) is performed; if not, controlling the self-cleaning device 21 to perform cleaning in a second mode, wherein the cleaning intensity of the first mode is greater than that of the second mode, and entering the step 5);
5) when cleaning is carried out in the first mode or the second mode, every certain cleaning time, pollution degree detection is carried out to obtain the current K, when the currently obtained K is lower than a certain proportion, cleaning is stopped, and the self-cleaning device 21 is closed;
6) then carrying out primary pollution degree detection, and setting the K obtained after detection to zero;
7) the second timing unit 226 restarts timing, sets the recorded T' to zero, and waits for the next trigger;
8) and (6) ending.
Correspondingly, in the active cleaning control flow, because the second timing unit 226 does not count time in the non-working state of the range hood, when the accumulated running time is used for cleaning intensity matching, the third timing unit 227 is separately set for non-working time counting, the third timing unit 227 is different from the second timing unit 226 of the accumulated running time, the timing is triggered to start in the power-off state, when the power-on running is performed next time, the third timing unit 227 is cleared, when the timing value of the third timing unit 227 reaches 10 days, the active cleaning program is considered to be unused for a long time, and the active cleaning program is triggered. The first timer unit 224, the second timer unit 226, and the third timer unit 227 may be hardware units electrically connected to the central processing unit 223, or may be timer program modules written in the central processing unit 223.
Specifically, the method comprises the following steps:
1) starting the range hood, starting timing by the second timing unit 226, stopping the range hood after use, starting timing by the third timing unit 227, resetting the second timing unit 226, recording the last timing data, restarting timing by the second timing unit 226 when the range hood is started next time, resetting the third timing unit 227, and recording the last timing data; with the continuous use of the range hood, the second timing unit 226 is continuously reset, and the last timing data t is obtainedj′'continuously overlapping for recording, wherein j' is the reset count; along with the extension of the shutdown time of the range hood, when the third timing unit 227 times for more than a certain time once, the central processing unit 223 is triggered, and the oil stain detection device is started to detect the pollution degree;
2) judging whether the currently detected K exceeds a preset degree, if so, starting a second mode for cleaning, and entering a step 3); if not, ending;
3) cleaning for a certain time by adopting a second mode, detecting the pollution degree again to obtain the current K, wherein the reference value is the distance detected by the blade 121 in an uncontaminated state; when the currently obtained K is lower than a certain proportion, stopping cleaning, and closing the self-cleaning device 21;
4) then carrying out primary pollution degree detection, and setting the K obtained after detection to zero;
5) the fan system 1 is turned off, the third timing unit 227 counts time again, and the second timing unit 226 records single timing data t during each resetj′' the accumulated time length obtained by adding is set to zero to wait for the next trigger.
Example two
It is considered that not all of the distance measuring sensors 221 can be mounted to the optimum mounting positions as in the first embodiment for different impellers 12. Due to the different degrees of the different types of distance measuring sensors 221 against the oil smoke influence and the limitation of the installation positions, in order to expand the installation range of the distance measuring sensor 221, referring to fig. 9, in the present embodiment, the difference from the first embodiment is that the distance measuring sensor 221 is disposed in a plane formed by the current detection point and the corresponding blade 121 in the axial direction, so that the distance measuring sensor 221 can be installed outside the impeller 12, thereby avoiding influencing the air flow or generating interference, and being particularly suitable for the distance measuring sensor 221 sensitive to pollution. Fig. 9 is a schematic sectional view parallel to the axial direction of the impeller, and the distance measuring sensor 221 is installed outside the impeller 12 as long as there is no obstacle in the detection direction. α is a mounting angle of the distance measuring sensor 221, i.e., an angle between the axial direction of the impeller 12 and the detection direction of the distance measuring sensor 221.
Only the inner surface of the blade 121 is shown in fig. 9, and similarly, two reference values are obtained by the manner of the present embodiment, which is the distance between the distance measuring sensor 221 and the surface of the blade 121. Under the current detection mode, the distance of each detection point is S1i' this distance is a distance from the distance measuring sensor 221 to the surface of the oil stain layer 200 on the blade 121, and the surface of the oil stain layer 200 is shown by a dotted line. The actual oil stain thickness of each detection point position after detection is delta Si′：
ΔSi' (hsin α) ═ S (reference value-S)1i′)sinα
Where h is the difference between the two detected distances, i.e., h ═ S (reference value-S)1i') and i is the number of the detection point. In the first embodiment, the difference between the distances detected at the two sides is the thickness of the oil stain, and in the present embodiment, the included angle exists between the installation angle and the axial direction of the impeller 12, so the above conversion is required.
After that, the actual oil stain thickness Δ S can be obtained by an algorithm of an average value, or the actual oil stain thickness Δ S can be obtained by comparing the maximum value with the average value.
EXAMPLE III
In view of the installation angle of the blade 121 itself and the influence of the rotation of the impeller 12, in order to avoid the problems of interference generated at the installation position applied to different impellers 12 or small movement gap, referring to fig. 10, the present embodiment is different from the first embodiment in that the detection direction of the distance measuring sensor 221 rotates around the detection point position. That is to say, the installation angle of the distance measuring sensor 221 of the first embodiment is located in the radial direction of the detection point, while the installation angle of the distance measuring sensor 221 of the present embodiment forms a certain included angle with the radial direction of the detection point, and is disposed in the plane perpendicular to the axis of the blade 121 corresponding to the current detection point and passing through the current detection point, as long as there is no obstacle to block in the detection direction, so that the problems of installation interference and small movement gap can be solved.
In fig. 10, β is an installation angle of the distance measuring sensor 221, and is an angle between a radial direction of the detection point and the detection direction. The radius of the blade 121 is R, and similarly, two reference values are obtained by the method of the present embodiment, and in the present detection mode, the distance at which each detection point is detected is S1iAnd the actual oil stain thickness of each detection point after detection is delta Si″：
Figure BDA0003410826330000141
Similarly, h ═ reference value-S1i″。
Wherein i is the number of the detection point location. In the first embodiment, the difference between the distances detected at the two sides is the oil stain thickness, and in the present embodiment, because there is an included angle between the installation angle and the radial direction of the current detection point of the impeller 12, the above conversion is required.
According to the difference of the design of the target impeller 12, in order to avoid the problems of interference and the like and to avoid the influences of pollution and the like of the distance measuring sensor 221, the two methods can be used in a mixed mode at the same time, so that the distance measuring sensor 221 and the detection point have an axial included angle and a radial included angle. The calculation method is a mixed calculation formula of the above two methods, and the oil stain thickness delta at the timeSiThe expression "" is as follows:
Figure BDA0003410826330000151
the meaning of each parameter is the same as above, and h ″, the reference value-S1i″′。

Claims (20)

1. The utility model provides a fan cleaning device for range hood, includes fan system (1) and clean mechanism (2), clean mechanism (2) are including being used for cleaning self-cleaning device (21) and the greasy dirt detection device of fan system (1), fan system (1) is including spiral case (11) and impeller (12) of setting in spiral case (11), impeller (12) are including two at least blades (121), its characterized in that:
the oil stain detection device comprises a proximity switch for detecting the position of the blade (121) and a distance measurement sensor (221) for detecting the thickness of oil stain on the blade (121);
the proximity switch comprises a proximity sensing element fixed on one of the volute (11) and the impeller (12) and a proximity switch element fixed on the other of the volute (11) and the impeller (12), the proximity sensing element can rotate with the impeller (12) to a sensing range of the proximity switch element, and a blade (121) corresponding to the position of the proximity switch element arranged on the impeller (12) is used as a detection point;
the distance measuring sensor (221) is fixed relative to the volute (11) so as to detect the distance between the distance measuring sensor and the detection point.
2. The fan cleaning device for a range hood according to claim 1, wherein: the proximity switch elements disposed on the impeller (12) are at least two and are disposed at regular intervals in the circumferential direction of the impeller (12).
3. The fan cleaning device for a range hood according to claim 2, wherein: the proximity switch is a magnetic sensitive switch.
4. The fan cleaning device for a range hood according to claim 3, wherein: the proximity sensing element is a magnet (227), the proximity switch element is a Hall sensor (222), the magnet (227) is arranged on the impeller (12), and the Hall sensor (222) is arranged on the volute (11).
5. The fan cleaning device for the range hood according to any one of claims 2 to 4, wherein: the oil stain detection device further comprises a control module, the control module comprises a central processing unit (223), the distance measurement sensor (221) and the proximity switch element are electrically connected with the central processing unit (223) respectively, and the distance measurement sensor (221) and the proximity switch element are controlled by the central processing unit (223) respectively and can input detected data to the input end of the central processing unit (223).
6. The fan cleaning device for a range hood according to claim 5, wherein: the control module further comprises a first timing unit (224).
7. A range hood, its characterized in that: a fan cleaning device for a range hood as claimed in any one of claims 1 to 6 is applied.
8. A method for detecting the pollution degree of a range hood is characterized in that: the range hood is applied with the fan cleaning device as claimed in claim 5 or 6, and the detection method comprises the following steps:
1) starting the oil stain detection device, reducing the rotating speed of the impeller (12), and entering a detection mode;
2) when entering a detection mode, the proximity switch element starts to receive signals until a proximity sensing element is sensed, the proximity switch element generates signals and inputs the signals to a central processing unit (223), and a blade (121) corresponding to a distance measuring sensor (221) is one of detection points at present, and then the step 3 is carried out;
3) the central processing unit (223) controls the distance measuring sensor (221) to detect and record the distance between the current detection point position and the distance measuring sensor (221); then, the impeller (12) continues to rotate, enters the next detection point position, detects and records the distance between the current detection point position and the distance measuring sensor (221); until the impeller (12) rotates for a circle, respectively measuring the distance value corresponding to each detection point;
4) comparing the distance value obtained by each detection point under the current detection mode with a reference value to obtain the oil stain thickness of each detection point; when the current detection mode is detection performed when the range hood does not enter the cleaning mode, the reference value refers to an average value of distance values corresponding to detection points when the range hood is not in a blade pollution-free state; when the detection mode is detection after the range hood enters the cleaning mode, the reference value is the mean value of the distance values corresponding to the detection points detected for the first time after cleaning;
5) the detection thickness value D obtained in the detection mode is obtained through the oil stain thickness of each detection point, and the current pollution degree K obtained through calculation of the central processing unit 223 is as follows:
Figure FDA0003410826320000021
and S is a preset oil stain thickness threshold value.
9. The method for detecting the degree of contamination of the fan cleaning device of the range hood according to claim 8, wherein: in step 5), the method for obtaining the detection thickness value D obtained in the detection mode at this time through the oil stain thickness of each detection point position is as follows: and averaging the oil stain thicknesses of all detection points to obtain an average oil stain thickness S' serving as a detection thickness value D.
10. The method for detecting the degree of contamination of the fan cleaning device of the range hood according to claim 8, wherein: in step 5), the method for obtaining the detection thickness value D obtained in the detection mode at this time through the oil stain thickness of each detection point position is as follows: for oil at each detection pointThe maximum value of the stain thickness Δ SmaxAnd an average value S'; if Δ S is satisfiedmaxif-S' is less than or equal to aS, then taking Delta SmaxFor this detection of the thickness value D, if delta S is satisfiedmaxIf S 'is more than aS, taking S' aS the thickness value D of the detection; where a is a constant.
11. The method for detecting the degree of contamination of the fan cleaning device of the range hood according to claim 8, wherein: in step 5), the method for obtaining the detection thickness value D obtained in the detection mode at this time through the oil stain thickness of each detection point position is as follows: and removing abnormal values of the oil stain thickness of each detection point, then averaging the residual oil stain thickness values, and taking the average value as the detection thickness value D.
12. The method for detecting the degree of contamination of the fan cleaning device of the range hood according to claim 8, wherein: the distance measuring sensor (221) is arranged in the impeller (12), the detection direction of the distance measuring sensor (221) is the radial direction of the blade (121) corresponding to the current detection point, and in the step 3), the impeller (12) rotates for one circle and then the distance value S corresponding to each detection point is measured respectively1iI is the number of the detection point location; in step 4), the reference value and the distance value S obtained in the current detection mode are compared1iSubtracting to obtain the oil stain thickness delta S of each detection pointiIs a reference value-S1i。
13. The method for detecting the degree of contamination of the fan cleaning device of the range hood according to claim 8, wherein: an included angle between the detection direction of the distance measuring sensor (221) and the axial direction of the impeller (12) is alpha, and in the step 3), the impeller (12) rotates for one circle and then the distance values S corresponding to the detection point positions are respectively measured1i', i is the number of the detection point location; in step 4), the reference value and the distance value obtained in the current detection mode are used for obtaining S1i', obtaining the oil stain thickness Delta S of each detection pointi' hsin alpha, where h is a reference value-S1i′。
14. The method for detecting the degree of contamination of the fan cleaning device of the range hood according to claim 8, wherein: the distance measuring sensor (221) is arranged in the impeller (12), an included angle between the detection direction of the distance measuring sensor (221) and the radial direction of the current detection point is beta, and in the step 3), the impeller (12) rotates for one circle and then the distance value S corresponding to each detection point is measured respectively1i", i is the number of the detection point location; in step 4), the reference value and the distance value obtained in the current detection mode are used for obtaining S1iObtaining the oil stain thickness of each detection point
Figure FDA0003410826320000031
Where h ═ reference value' -S1iAnd R is the radius of the blade (121).
15. The method for detecting the degree of contamination of the fan cleaning device of the range hood according to claim 8, wherein: an included angle between the detection direction of the distance measuring sensor (221) and the axial direction of the impeller (12) is alpha, an included angle between the detection direction of the distance measuring sensor (221) and the radial direction of the current detection point position is beta, and in the step 3), the impeller (12) rotates for one circle and then respectively measures distance values S corresponding to the detection point positions1i", i is the number of the detection point location; in step 4), the reference value and the distance value obtained in the current detection mode are used for obtaining S1i' obtaining the oil stain thickness of each detection point position
Figure FDA0003410826320000032
Figure FDA0003410826320000033
Where h ″, is the reference value-S1i", R is the radius of the blade (121).
16. A cleaning reminding method of a range hood is characterized in that: the range hood is applied with the fan cleaning device as claimed in claim 6, and the cleaning reminding method comprises the following steps:
1) obtaining current K by using the pollution degree detection method according to any one of claims 8 to 15;
2) and displaying the current K on a control panel of the range hood.
17. A cleaning strength matching method of a range hood is characterized in that: the range hood is applied with the fan cleaning device as claimed in claim 6, and the pollution degree detection method as claimed in any one of claims 8 to 15 is adopted for detecting the pollution degree;
the cleaning intensity matching method comprises the following steps:
1) firstly, the range hood runs and oil stains are accumulated;
2) carrying out pollution degree detection, starting timing by the first timing unit (224) at the same time, resetting the first timing unit (224) until the pollution degree detection is carried out again, and recording the last timing data; with the contamination level detection being performed continuously, the first timing unit (224) is reset continuously, and the last timing data t is obtainedjContinuously overlapping and recording, wherein j is reset times and counts; when the detected K is more than or equal to 100 percent, entering the step 3), and if not, entering the step 8);
3) calculating the accumulated time length T:
Figure FDA0003410826320000041
where n2 is the total number of resets;
4) reading a predetermined time threshold T0And judging that T is more than or equal to T0If yes, the central processing unit (223) outputs a control signal to control the self-cleaning device (21) to clean in a first mode, and the step 5) is carried out; if not, controlling the self-cleaning device (21) to clean in a second mode, wherein the cleaning intensity of the first mode is higher than that of the second mode, and entering the step 5);
5) when cleaning is carried out in the first mode or the second mode, every certain cleaning time, pollution degree detection is carried out to obtain the current K, when the currently obtained K is lower than a certain proportion, cleaning is stopped, and the self-cleaning device (21) is closed;
6) then carrying out primary pollution degree detection, and setting the K obtained after detection to zero;
7) the first timing unit (224) restarts timing, and the recorded T is set to zero to wait for the next trigger;
8) and (5) closing the fan system (1) and ending.
18. An active cleaning control method of a range hood is characterized in that: the range hood is applied with the fan cleaning device as claimed in claim 6, the fan cleaning device has two cleaning modes, namely a first mode and a second mode, and the cleaning intensity of the first mode is greater than that of the second mode; carrying out pollution degree detection by adopting the pollution degree detection method according to any one of claims 8-15;
the active cleaning control method comprises the following steps:
1) when the first timing unit (224) starts to time for a single time, the central processing unit (223) is triggered to start the oil stain detection device to detect the pollution degree;
2) judging whether the currently detected K exceeds a preset degree, if so, starting a second mode for cleaning, and entering a step 3); if not, ending;
3) cleaning for a certain time by adopting a second mode, detecting the pollution degree again to obtain the current K, wherein the reference value is the distance detected by the blade (121) in an uncontaminated state; when the currently obtained K is lower than a certain proportion, stopping cleaning and closing the self-cleaning device (21);
4) then carrying out primary pollution degree detection, and setting the K obtained after detection to zero;
5) the first timing unit (224) performs timing again, and the accumulated time length obtained by adding the single timing recorded during each resetting of the first timing unit (224) is set to zero to wait for the next triggering; and simultaneously closing the fan system (1) and ending.
19. A cleaning strength matching method of a range hood is characterized in that: the range hood is provided with the fan cleaning device according to claim 6, the control module of the range hood further comprises a second timing unit (226) for timing when the range hood is started, and the pollution degree detection is performed by using the pollution degree detection method according to any one of claims 8 to 15;
the cleaning intensity matching method comprises the following steps:
1) when the range hood starts to operate, the second timing unit (226) starts to time at the same time;
2) after the use, the range hood is closed, the second timing unit (226) is reset to zero, and the last timing data is recorded; with the continuous use of the range hood, the second timing unit (226) is continuously reset, and the last timing data tj′'continuously overlapping for recording, wherein j' is the reset count; when the detected K is more than or equal to 100 percent, entering the step 3), and if not, entering the step 8);
3) calculating the accumulated time length T':
Figure FDA0003410826320000051
where n 2' is the total number of resets;
4) reading a predetermined time threshold T0', judging that T' is not less than T0If yes, the central processing unit (223) outputs a control signal to control the self-cleaning device (21) to clean in a first mode, and the step 5 is entered; if not, controlling the self-cleaning device (21) to clean in a second mode, wherein the cleaning intensity of the first mode is higher than that of the second mode, and entering the step 5);
5) when cleaning is carried out in the first mode or the second mode, every certain cleaning time, pollution degree detection is carried out to obtain the current K, when the currently obtained K is lower than a certain proportion, cleaning is stopped, and the self-cleaning device (21) is closed;
6) then carrying out primary pollution degree detection, and setting the K obtained after detection to zero;
7) the second timing unit (226) restarts timing, and the recorded T' is set to zero to wait for the next trigger;
8) and (6) ending.
20. An active cleaning control method of a range hood is characterized in that: the range hood is applied with the fan cleaning device as claimed in claim 6, the control module of the range hood further comprises a third timing unit (227) for timing when the range hood is turned off, the fan cleaning device has two cleaning modes, namely a first mode and a second mode, and the cleaning intensity of the first mode is greater than that of the second mode; carrying out pollution degree detection by adopting the pollution degree detection method according to any one of claims 8-15;
the active cleaning control method comprises the following steps:
1) when the range hood is closed, the third timing unit (227) starts to time, and when the range hood is started next time, the third timing unit (227) starts to time; along with the prolonging of the shutdown time of the range hood, when the third timing unit (227) counts for a single time and exceeds a certain time, the central processing unit (223) is triggered, and the oil stain detection device is started to detect the pollution degree;
2) judging whether the currently detected K exceeds a preset degree, if so, starting a second mode for cleaning, and entering a step 3); if not, ending;
3) cleaning for a certain time by adopting a second mode, detecting the pollution degree again to obtain the current K, wherein the reference value is the distance detected by the blade (121) in an uncontaminated state; when the currently obtained K is lower than a certain proportion, stopping cleaning and closing the self-cleaning device (21);
4) then carrying out primary pollution degree detection, and setting the K obtained after detection to zero;
5) and (3) the fan system (1) is turned off, and the third timing unit (227) counts again and waits for the next trigger.
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