A range hood and a control method thereof

Abstract

The application discloses an extractor hood and a control method thereof. The extractor hood comprises a box body and a filter screen assembly, and an air inlet is formed in the box body. The filter screen assembly comprises a filter screen, and the filter screen has a front surface facing the outside of the box body and a back surface facing the inside of the box body. The extractor hood further comprises a first movement mechanism for driving the filter screen to turn over, and the first movement mechanism comprises a first driving mechanism and a second driving mechanism arranged at the output end of the first driving mechanism. The first driving mechanism can be operated to at least three positions, i.e. a first position, a second position and a third position. In the first position, the filter screen is driven to be located at the air inlet, and at this time, the output end of the second driving mechanism and the filter screen are in a synchronous movement cooperation mode. In the second position, the filter screen is driven to be located above the air inlet, and the second driving mechanism can drive the filter screen to rotate, so that the front surface and the back surface of the filter screen are turned over. In the third position, the filter screen is driven to be located above the air inlet, and at this time, the output end of the second driving mechanism and the filter screen are in a relative sliding cooperation mode, and the filter screen can slide relative to the output end of the second driving mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to an oil fume purification device, in particular to an extractor hood and a control method thereof. BACKGROUND

[0002] The extractor hood has become one of the indispensable kitchen household appliances in modern families. The extractor hood works by using the principle of fluid dynamics, and absorbs and discharges the oil fume by using the fan system installed inside the extractor hood and filtering part of the oil particles by using the filter screen. The fan system is usually a centrifugal fan, which includes a volute, an impeller installed in the volute, and a motor driving the impeller to rotate. When the impeller rotates, a negative pressure suction force is generated at the center of the fan, which sucks the oil fume below the extractor hood into the fan, and then the oil fume is collected and guided by the volute after being accelerated by the fan and discharged outdoors.

[0003] When the oil fume passes through the filter screen, the large particles (usually larger than PM10) of the oil stain are filtered, and then enter the inside of the extractor hood, and then the small particles of the oil stain remaining are further filtered by the centrifugal force of the fan. If the filter screen is not provided, a large amount of large particle oil fume will enter the fan system, and if a large amount of oil fume particles adhere to the impeller, the dynamic balance of the impeller will be destroyed, which will intensify the shaking of the extractor hood and increase the noise. However, the filter screen of the prior art usually does not have a self-cleaning function, and long-term use will block the oil screen, which will increase the air inlet resistance and thus reduce the smoke absorption effect. Therefore, the filter screen usually needs to be regularly disassembled and cleaned, which brings great inconvenience to the user.

[0004] Therefore, there is currently a self-cleaning extractor hood that uses steam cleaning technology. The extractor hood usually has a spray pipe, and the steam enters the spray pipe and is sprayed out of the openings of the spray pipe, thereby cleaning the fan, filter screen, and the like of the extractor hood. However, the spray pipe in the prior art usually has a plurality of openings on the spray pipe. The diameter of such openings will gradually decrease when exposed to an oil stain environment for a long time, and eventually be completely blocked by the oil stain.

[0005] In addition, there is also a self-cleaning extractor hood that uses a brush, an oil scraping plate, and the like to clean the filter screen. For example, a Chinese patent with application number 202121673898.0 discloses an extractor hood with a filter screen self-cleaning function, which includes a body, an absorption groove is formed on the outer side of the body, a discharge groove is formed inside the body and below the absorption groove, a filter screen is fixedly installed on one side of the inner wall of the absorption groove, and a cleaning brush is driven to move and rotate by setting a lead screw transmission and a gear and rack transmission, thereby cleaning the filter screen.

[0006] However, due to the side suction or low suction range hood, the filter screen is usually arranged at the air inlet, and the oil fume first contacts the front side surface (exposed surface) of the filter screen for filtering. Generally, the oil stain on the front side surface of the filter screen is usually more. The above-mentioned existing self-cleaning device can only clean the inner surface (rear side surface) of the filter screen, and cannot achieve self-cleaning for the front side surface of the filter screen. The current solution is usually that the user manually wipes or disassembles and cleans (such as the oil fume separation range hood disclosed in Chinese Patent No. 201922427984.2) or sets a cleaning mechanism outside the range hood for self-cleaning (such as the oil fume filter screen disclosed in Chinese Patent No. 202123047422.9, which comprises a handle, a filter screen and a frame, the handle is arranged at the center of the upper end of the frame, the filter screen is arranged at the lower end of the handle, and the external cleaning device is provided with a push rod outside). Manual wiping or disassembly and cleaning can bring bad user experience, and can also make the water pool for cleaning the filter screen greasy and difficult to clean, and may need to be cleaned once a month or so; the external cleaning mechanism is inconvenient to use and occupies the installation space of the range hood. SUMMARY

[0007] The first technical problem to be solved by the present application is to provide a range hood which can reduce the cleaning frequency of the filter screen.

[0008] The second technical problem to be solved by the present application is to provide a range hood which can conveniently clean the front and back surfaces of the filter screen.

[0009] The third technical problem to be solved by the present application is to provide a control method for the above-mentioned range hood.

[0010] The technical solution adopted by the present application to solve the first technical problem is as follows: a range hood, comprising an air inlet assembly, the air inlet assembly comprising a box body and a filter screen assembly, the box body being provided with an air inlet;

[0011] The filter screen assembly comprises a filter screen corresponding to the air inlet, the filter screen having a front surface facing the outside of the box body and a back surface facing the inside of the box body; characterized in that:

[0012] The air inlet assembly further comprises a first movement mechanism for driving the filter screen to turn over, the first movement mechanism comprising:

[0013] The first driving mechanism is a linear driving module;

[0014] The second driving mechanism is a rotary driving module, arranged at the output end of the first driving mechanism, and in transmission connection with the filter screen;

[0015] The first driving mechanism can operate to at least three positions:

[0016] The first position is that the driving filter screen is located at the air inlet, and the output end of the second driving mechanism and the filter screen are in synchronous motion cooperation mode;

[0017] The second position is that the driving filter screen is located above the air inlet, and the output end of the second driving mechanism and the filter screen are in synchronous motion cooperation mode, and the second driving mechanism can drive the filter screen to rotate, so as to turn the front and back surfaces of the filter screen.

[0018] The third position is that the driving filter screen is located above the air inlet, and the output end of the second driving mechanism and the filter screen are in relative sliding cooperation mode, and the filter screen can slide relative to the output end of the second driving mechanism, and the sliding direction is the same as the linear motion direction of the output of the first driving mechanism.

[0019] Since the oil fume first contacts and filters the front surface (exposed surface) of the filter screen, generally, the oil stain on the front surface of the filter screen is usually more, therefore, by allowing the filter screen to be turned over, the front surface with more oil stain can be turned over to the back surface after a period of use, avoiding the long-term exposure of the heavily polluted surface, and the cleaning frequency of the filter screen can be reduced; in addition, the filter screen is not turned over at the original position, but is turned over after being lifted, so that other components, such as a guide plate, a smoke baffle or a cleaning device, used to improve the oil fume suction efficiency, can be arranged at the position corresponding to the air inlet on the inside of the box, avoiding the interference between the filter screen and these components during the turning over of the filter screen.

[0020] Preferably, the output end of the second driving mechanism is in transmission connection with the filter screen through a driving shaft, and the driving shaft switches the cooperation mode with the filter screen through the movement in the left-right direction.

[0021] In order to facilitate the cooperation mode switching between the driving shaft and the filter screen, the filter screen assembly further comprises first support frames arranged on the left and right sides of the filter screen, and the filter screen is fixed with the first support frames.

[0022] A support sliding groove is formed in the first support frame, and a clamping groove is formed at the upper and lower ends of the support sliding groove, respectively. The end of the driving shaft cooperating with the first support frame comprises a first shaft and a second shaft, the length of the first shaft is shorter than the length of the second shaft, when the first shaft and the second shaft are clamped in the clamping groove, the driving shaft and the first support frame are in synchronous motion cooperation mode; when the first shaft is separated from the clamping groove, the second shaft is in sliding cooperation with the support sliding groove, and the driving shaft and the first support frame are in relative sliding cooperation mode.

[0023] The clamping groove is in cross shape, and the first shaft and the second shaft are both cuboids and are arranged in cross shape.

[0024] In order to facilitate the movement of the driving shaft relative to the filter screen to switch the cooperation mode, the second driving mechanism is arranged on the left and / or right side of the filter screen, each second driving mechanism corresponding to a first driving mechanism, the first driving mechanism and the corresponding second driving mechanism being capable of moving left and right within the cabinet, when the second driving mechanism is close to the filter screen, the driving shaft and the first support frame are in the synchronous movement cooperation mode, when the second driving mechanism is away from the filter screen, the driving shaft and the first support frame are in the relative sliding cooperation mode, and the second driving mechanism keeps the tendency of moving close to the filter screen.

[0025] In order to simplify the movement mechanism and make the left and right movement of the second driving mechanism be realized during the extension and retraction of the first driving mechanism, the first movement mechanism further comprises a frame fixedly arranged in the cabinet, the first driving mechanism being arranged in the frame and being capable of moving left and right relative to the frame, and the first movement mechanism further comprises a stopper arranged in the frame, the bottom surface of the stopper being inclined, so that when the second driving mechanism moves upward along the bottom surface of the stopper, it gradually moves away from the filter screen.

[0026] In order to facilitate the reset of the first driving mechanism and the second driving mechanism, the first driving mechanism comprises a body and an output push rod capable of extending and retracting upward and downward relative to the body, the second driving mechanism being arranged on the output push rod, a first elastic member being further arranged in the frame, the first elastic member and the stopper being respectively arranged on the opposite sides of the body, and the first elastic member making the body keep the tendency of moving back to the stopper.

[0027] In order to reduce the escape of oil fume, the range hood further comprises a smoke baffle assembly arranged in the cabinet, the smoke baffle assembly being arranged corresponding to the air inlet, and the smoke baffle assembly comprising at least one smoke baffle capable of moving left and right relative to the cabinet.

[0028] Further, the smoke baffles at least have two arranged left and right, the sum of the lengths of the smoke baffles being less than the length of the air inlet, the air inlet assembly further comprising a second movement mechanism for driving the smoke baffles to move, and the first movement mechanism being a linear driving module, each smoke baffle corresponding to a second movement mechanism. By arranging a plurality of smoke baffles, different cooking conditions can be better adapted to, and the moving distance can be reduced.

[0029] Preferably, the smoke baffles are hollow and open on the side facing the filter screen, and the range hood further comprises a cleaning device for cleaning the filter screen, the cleaning device being at least partially arranged in each smoke baffle, so that the cleaning of the filter screen can be facilitated, and the structure is simplified, so that the cleaning device can realize the overall cleaning of the filter screen by the movement of the smoke baffles.

[0030] Preferably, the cleaning device comprises a roller brush and a third moving mechanism for driving the roller brush to rotate, the roller brush is partially arranged in the smoke baffle and protrudes forward from the smoke baffle to contact the filter screen, so that the rotation of the roller brush improves the cleaning effect and facilitates self-cleaning of the roller brush through high-speed rotation.

[0031] Preferably, the smoke baffle is provided with at least two roller brushes arranged left and right, the third moving mechanism comprises a second motor, a driving gear driven by the second motor to rotate, and a transmission gear arranged on each roller brush, the driving gear is engaged with the closest transmission gear, and the adjacent transmission gears are engaged with each other.

[0032] In order to facilitate cleaning of the filter screen, the box is further provided with a cleaning device for cleaning the filter screen.

[0033] The technical scheme adopted by the present application to solve the first technical problem is: an extractor hood, comprising an air inlet assembly, the air inlet assembly comprising a box and a filter screen assembly, the box being provided with an air inlet;

[0034] The filter screen assembly comprises a filter screen corresponding to the air inlet, the filter screen having a front surface facing the outside of the box and a back surface facing the inside of the box; characterized in that:

[0035] The filter screen is rotationally connected with the box to realize flipping of the front surface and the back surface;

[0036] The box is further provided with a cleaning device for cleaning the filter screen.

[0037] Since the oil fume first contacts and filters the front surface (exposed surface) of the filter screen, generally, the oil stain on the front surface of the filter screen is usually more, therefore, by enabling the filter screen to be flipped, the front surface with more oil stain can be flipped to become the back surface after a period of use, avoiding the heavily polluted surface from being exposed for a long time, and the cleaning device can be used to clean after flipping, conveniently realizing cleaning of both surfaces of the filter screen. This scheme is applicable to the case where the smoke baffle is not arranged, at this time, the movement (such as lifting) of the cleaning device can be used to avoid interference with flipping of the filter screen, and the driving mechanism of the filter screen can also be relatively simple, such as using only a motor, so that the rotation axis of the filter screen is located at the middle position in the height direction of the filter screen to avoid upward and downward displacement relative to the air inlet during flipping.

[0038] The technical scheme adopted by the present application to solve the third technical problem is: a control method of the extractor hood as described above, the extractor hood further comprising a thickness sensor arranged on the inside of the box above the air inlet for detecting the thickness of oil, characterized in that: the control method comprises the following steps:

[0039] 1) The range hood is started, and it is detected whether the range hood is not used for more than a certain time set in advance. If yes, the filter screen front and back cleaning program is entered, the filter screen is turned over, and the front and back of the filter screen are cleaned. After cleaning, the cleaning program is ended. If no, step 2) is entered.

[0040] 2) It is judged whether the filter screen needs to be cleaned. If yes, step 3) is entered. If no, after each cooking is ended, the filter screen turning over program is started, and the filter screen is turned over.

[0041] 3) During cooking, the first driving mechanism is located at the first position, and the exposed surface of the filter screen at this time is the front surface, and the inward surface is the back surface. After this cooking is ended, the first driving mechanism is operated from the first position to the second position, and the oil thickness of the front surface of the filter screen is detected by the thickness sensor. If it is detected that the oil thickness of the front surface exceeds the preset threshold, step 4) is entered. If it is detected that the oil thickness of the front surface does not exceed the preset threshold, step 7) is entered.

[0042] 4) The second driving mechanism drives the filter screen to rotate 180°, and then the first driving mechanism is operated to the third position. The filter screen slides down under the action of gravity, and then the first driving mechanism is operated to the second position.

[0043] 5) The first driving mechanism continues to operate to the first position, the filter screen is reset to the air inlet, and the cleaning device cleans the front surface of the filter screen.

[0044] 6) After cleaning, the first driving mechanism is operated to the second position again.

[0045] 7) The oil dirt thickness of the back surface of the filter screen is detected. If it is detected that the oil thickness of the back surface exceeds the preset threshold, step 8) is entered. If it is detected that the oil thickness of the back surface does not exceed the preset threshold, step 10) is entered.

[0046] 8) The second driving mechanism drives the filter screen to rotate 180°, and then the first driving mechanism is operated to the third position. The filter screen slides down under the action of gravity, and then the first driving mechanism is operated to the second position.

[0047] 9) The first driving mechanism continues to operate to the first position, the filter screen is reset to the air inlet, and the cleaning device cleans the back surface of the filter screen. After cleaning, the cleaning program is ended.

[0048] 10) It is judged whether the front surface of the filter screen has met the preset cleaning degree. If yes, the cleaning program is ended. If no, the filter screen front and back cleaning program is started, the filter screen is turned over, and the front and back of the filter screen are cleaned. Then the cleaning program is ended.

[0049] The filter screen front and back cleaning program comprises the following steps:

[0050] S1) the first driving mechanism runs to the first position, and the cleaning device cleans the surface currently corresponding to the filter screen;

[0051] S2) after the one-side surface of the filter screen is cleaned, the first driving mechanism runs from the first position to the second position, and the filter screen rises away from the air inlet;

[0052] S3) the second driving mechanism drives the filter screen to rotate 180°, and then the first driving mechanism runs to the third position, and the filter screen slides downward under the action of gravity;

[0053] S4) the first driving mechanism runs to the first position, and the filter screen is reset to the air inlet, and the cleaning device cleans the surface currently corresponding to the filter screen, thereby completing the cleaning of the front and back surfaces.

[0054] The filter screen turning procedure comprises the following steps:

[0055] S1) the first driving mechanism runs to the second position;

[0056] S2) the second driving mechanism drives the filter screen to rotate 180°, and then the first driving mechanism runs to the third position, and the filter screen slides downward under the action of gravity;

[0057] S3) the first driving mechanism runs to the first position, and the filter screen is reset to the air inlet, thereby realizing the turning of the filter screen.

[0058] Compared with the prior art, the advantages of the present application are that: since the oil fume first contacts and filters the front surface (exposed surface) of the filter screen, generally, the oil stain on the front surface of the filter screen is usually more, therefore, by enabling the filter screen to be turned over, the front surface with more oil stains can be turned over to become the back surface after a period of use, the surface with heavy pollution can be avoided from being exposed for a long time, the cleaning frequency of the filter screen can be reduced; the front and back surfaces of the filter screen can be cleaned, the peculiar smell can be reduced, and when the clean filter screen needs to be exposed, the time consumed for cleaning can be shortened; the cleaning device is arranged on the smoke baffle, the movement of the cleaning device can be realized when the smoke baffle moves, and then the comprehensive cleaning of the filter screen can be realized, the movement mechanism is simplified, and the space is saved. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 It is a schematic view of the range hood of the embodiment of the present application;

[0060] Figure 2 It is a schematic view of the range hood of the embodiment of the present application, in which the fan frame is hidden;

[0061] Figure 3 It is a sectional view (left-right sectional view, viewed from back to front) of the range hood of the embodiment of the present application, in which the fan frame is hidden.

[0062] Figure 4 Schematic diagram of the filter screen assembly and its movement mechanism of the range hood according to an embodiment of the present application (first position);

[0063] Figure 5 Schematic diagram of the movement mechanism of the filter screen assembly of the range hood according to an embodiment of the present application;

[0064] Figure 6 Schematic diagram of the filter screen drive shaft and the filter screen support frame (first support frame) of the range hood according to an embodiment of the present application;

[0065] Figure 7 Exploded structural schematic diagram of Figure 6 ;

[0066] Figure 8 Cross-sectional view of the filter screen drive shaft and the filter screen support frame of the range hood according to an embodiment of the present application (relative sliding fit mode);

[0067] Figure 9 Cross-sectional view of the filter screen drive shaft and the filter screen support frame of the range hood according to an embodiment of the present application (synchronous movement fit mode);

[0068] Figure 10 Schematic diagram of the filter screen assembly and its movement mechanism of the range hood according to an embodiment of the present application (second position);

[0069] Figure 11 Schematic diagram of the filter screen assembly and its movement mechanism of the range hood according to an embodiment of the present application (third position);

[0070] Figure 12 Schematic diagram of the filter screen assembly and its movement mechanism of the range hood according to an embodiment of the present application (fourth position);

[0071] Figure 13 Cross-sectional view of the range hood according to an embodiment of the present application (front-to-back cross section);

[0072] Figure 14 Partial schematic diagram of the smoke baffle assembly and its movement mechanism of the range hood according to an embodiment of the present application;

[0073] Figure 15 Schematic diagram of Figure 14 the hidden smoke baffle support frame (second support frame);

[0074] Figure 16 Schematic diagram of the smoke baffle assembly, cleaning device and movement mechanism of the range hood according to an embodiment of the present application;

[0075] Figure 17 Exploded structural schematic diagram of Figure 16Partial view of the hidden smoke baffle support frame (second support frame);

[0076] Figure 18 Schematic view of the cooperation between the rolling brush and the driving seat of the cleaning device of the range hood according to the embodiment of the present application;

[0077] Figure 19 Exploded structural schematic view of the rolling brush and the driving seat of the cleaning device of the range hood according to the embodiment of the present application;

[0078] Figure 20 Flow chart of the filter screen cleaning control of the range hood according to the embodiment of the present application;

[0079] Figure 21 Flow chart of the smoke baffle assembly control of the range hood according to the embodiment of the present application;

[0080] Figures 22-1 to 22-9 Schematic view of different positions of the smoke baffle assembly of the range hood according to the embodiment of the present application. DETAILED DESCRIPTION

[0081] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar notations denote the same or similar elements or elements having the same or similar functions.

[0082] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, since the disclosed embodiments of the present application can be arranged in different directions, so these orientation-indicating terms are only illustrative and should not be regarded as limiting, such as "upper", "lower" which are not necessarily limited to the direction opposite or consistent with the direction of gravity. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more of the features.

[0083] Referring to Figures 1 to 5 A range hood, comprising an air inlet assembly 1 and a fan frame 2 arranged above the air inlet assembly 1, the air inlet assembly 1 comprising a box body 11, a filter screen assembly 12 and a smoke baffle assembly 13. A fan system (not shown) is arranged in the fan frame 2, alternatively, the fan system can be partially or entirely arranged in the box body 11.

[0084] The box 11 is hollow rectangular, and the front side is provided with an air inlet 111. Preferably, the air inlet 111 is located at the lower part of the front side of the box 11 and is close to the bottom of the box 11. The front side of the box 11 is vertical or close to vertical in this embodiment. Alternatively, the front side of the box 11 can be gradually inclined backward from top to bottom, like the common side suction type range hood.

[0085] The filter screen assembly 12 includes a filter screen 121 and a first support frame 122 fixedly arranged on the left and right sides of the filter screen 121. When the range hood is in a working state, the filter screen assembly 12 is located at the air inlet 111. Since the oil fume passes through the filter screen 121 during cooking, the filter screen 121 performs primary filtration on the oil fume, reduces the pollution of the inner cavity of the range hood and the fan system, and can prolong the service life of the range hood.

[0086] To avoid the front side of the filter screen 121 being always the same surface, resulting in the need for frequent cleaning, in the present application, the filter screen 121 can realize front and back surface flipping. Therefore, the front and back surfaces of the filter screen 121 are both smooth surfaces. Here, the front and back surfaces refer to the two surfaces that are outward (exposed surface) and inward toward the box 11 in the use state.

[0087] The air inlet assembly 1 further includes a first movement mechanism for driving the filter screen assembly 12 to flip the front and back surfaces. The first movement mechanism includes a frame 141, a first driving mechanism 142 and a second driving mechanism 143. The frame 141 is fixed in the box 11 and can be generally U-shaped with the opening of the U-shaped downward. When the range hood is in a working state, the filter screen assembly 121 extends downward from the opening of the frame 141. Alternatively, the frame 141 can also be two independent longitudinal extensions, which are respectively arranged on the left and right sides of the filter screen 121. The first driving mechanism 142 is preferably provided with two, which are respectively arranged in the frame 141 and located on the left and right sides of the filter screen 121. The structures of the two first driving mechanisms 142 can be the same, so as to stably drive the filter screen 121. Each first driving mechanism 142 is a linear driving module, such as an electric push rod in this embodiment. Other existing linear driving modules can also be used, such as motor gear and rack combination, motor screw and nut combination, etc. The first driving mechanism 142 includes a body 1421 and an output push rod 1422. The body 1421 is installed in the frame 141 through a mounting bracket 1423. The mounting bracket 1423 is fixed with the frame 141. The body 1422 can move relative to the frame 141, and the output push rod 1422 extends downward out of the mounting bracket 1423 from the body 1421. The output push rod 1422 is driven by the body 1421 to be able to stretch and retract upward and downward relative to the body 1421.

[0088] The support bracket 1424 and the first elastic member 1425 are arranged in the mounting bracket 1423. The body 1421 of the first driving mechanism 142 and the output push rod 1422 are in telescopic cooperation, and the part of the body 1421 extending through the support bracket 1424 extends up and down relative to the support bracket 1424. The body 1421 can move left and right relative to the support bracket 1424. The first elastic member 1425 is arranged between the part of the body 1421 extending through the support bracket 1424 and the wall surface of the mounting bracket 1423, and is located on the side of the body 1421 away from the filter screen 121. The body 1421 of the two first driving mechanisms 142 keeps a tendency to move towards each other.

[0089] The second driving mechanism 143 is also arranged in the frame 141, and is a rotating driving module, such as a motor in the embodiment. The second driving mechanism 143 is arranged at the output end of the first driving mechanism 142, and in the embodiment, is arranged on the output push rod 1422, such as the end of the output push rod 1422, and can ascend and descend with the telescopic movement of the output push rod 1422. The frame 141 is also provided with a stop block 144, and the stop block 144 cooperates with the second driving mechanism 143. The bottom surface of the stop block 144 can be inclined, and gradually inclines downward from the position away from the fixed position of the frame 141 to the fixed position of the frame 141. The stop block 144 and the first elastic member 1425 are respectively located on the opposite sides of the body 1421. Referring to Figure 10 When the second driving mechanism 143 abuts against the bottom surface of the stop block 144, since the bottom surface of the stop block 144 is inclined, when the second driving mechanism 143 continues to ascend, the second driving mechanism 143 can be pushed by the stop block 144 away from the filter screen 121. At this time, the first elastic member 1425 is compressed. Referring to Figure 11 The left second driving mechanism 143 is pushed to the left, and the right second driving mechanism 143 is pushed to the right.

[0090] Referring to Figures 4 to 7 The first movement mechanism further includes a driving shaft 145. One end of the driving shaft 145 is in transmission connection with the output end of the second driving mechanism 143, so that the second driving mechanism 143 can drive the driving shaft 145 to rotate about the axis of the driving shaft 145. The axis of the driving shaft 145 extends in the left-right direction. The other end of the driving shaft 145 extends out of the frame 141 and cooperates with the first support bracket 122 of the filter screen assembly 12. Alternatively, the output end of the second driving mechanism 143 can extend out of the frame 141, and the driving shaft 145 does not need to extend into the frame 141. The side of the frame 141 close to the filter screen 121 is provided with a guide groove 1411 extending vertically, for the driving shaft 145 to extend through, and the driving shaft 145 can be guided to ascend and descend. When the front surface of the box body 11 is not a vertical surface, the guide groove 1411 is correspondingly inclined at the same angle (both gradually incline backward from top to bottom), so that the track of the ascending and descending movement of the filter screen 121 has a certain angle with the vertical direction.

[0091] The end of the driving shaft 145 matched with the first support frame 122 is cross-shaped, including a first shaft 1451 and a second shaft 1452, the two shafts are cross-arranged to be cross-shaped, wherein the length of the first shaft 1451 is shorter than the length of the second shaft 1452, the length here refers to the size along the axis direction of the driving shaft 145, thereby making the distance between the end surface of the first shaft 1451 extending into the first support frame 122 and the corresponding end surface of the filter screen 121 greater than the distance between the end surface of the second shaft 1452 extending into the second support frame 122 and the corresponding end surface of the filter screen 121. In the embodiment, the first shaft 1451 and the second shaft 1452 are both cuboids, and the two shafts have different lengths, so that the end surfaces of the two shafts extending into the second support frame 122 are not located in the same vertical plane.

[0092] The first support frame 122 is formed with a support sliding groove 1221, the support sliding groove 1221 extends in the same direction as the corresponding guide groove 1411, and also in the same direction as the extension direction of the first driving mechanism 142. The two ends of the support sliding groove 1221 are formed with clamping grooves 1222, and in the embodiment, the depth of the clamping grooves 1222 is greater than the depth of the sliding groove 1221 (the depth of the clamping grooves 1222 can also be less than the depth of the sliding groove 1221, and in this case, the inclination direction of the bottom surface of the stop block 144 is opposite), thereby making the driving shaft 145 and the first support frame 122 have two matching modes: one is a relative sliding matching mode, and the other is a tightly matched synchronous motion matching mode. When the first shaft 1451 is clamped in the clamping groove 1222, the filter screen 121 can be turned over under the driving of the second driving mechanism 143, as shown in FIG. 6, and the axis of turning over is the axis of the driving shaft 145. When the first shaft 1451 is disengaged from the clamping groove 1222, only the long second shaft 1452 is clamped in the support sliding groove 1221, so that the filter screen 121 can slide downward under the action of gravity, as shown in FIG. 7. Figure 8 Figure 9

[0093] Alternatively, the clamping grooves 1222 and the end of the driving shaft 145 can also not be cross-shaped, but adopt other polygonal shapes.

[0094] The first driving mechanism 142 (output push rod 1422) has three positions in total, as shown in FIG. 8, which is the working state of the range hood (first position), and the output push rod 1422 is in an elongated state; as shown in FIG. 9, which is the cleaning state of the range hood (second position), and the output push rod 1422 is in a retracted state; as shown in FIG. 10, which is the standby state of the range hood (third position), and the output push rod 1422 is in a state of being half retracted. Figure 4 Figure 10 ​​​, the output push rod 1422 is in the retracted position (second position), and the second driving mechanism 143 is just lifted to the bottom surface of the stopper 144, which can detect the thickness of the oil on the filter screen 121. In the first position and the second position, the driving shaft 145 and the first support frame 122 are in synchronous motion cooperation mode, the driving shaft 145 cooperates with the clamping groove 1222 on the upper part of the first support frame 122, and the rolling brush can be disassembled and cleaned (which will be described below); in the second position, the second driving mechanism 143 is started to drive the filter screen 121 to flip; thereafter, referring to Figure 11 , the output push rod 142 continues to retract from the second position, and under the guidance of the inclined surface of the stopper 144, the first driving mechanism 142 and the second driving mechanism 143 on the left move to the left as a whole, and the first driving mechanism 142 and the second driving mechanism 143 on the right move to the right as a whole, until the first driving mechanism 142 runs to the third position, at which time the first shaft 1451 of the driving shaft 145 is separated from the clamping groove 1222 of the first support frame 122, and the filter screen 121 can slide along the support sliding groove 1221, that is, in relative sliding cooperation mode; referring to Figure 12 , the filter screen 121 slides downward under the action of gravity until the upper end surface of the clamping groove 1222 on the upper part of the first support frame 122 after flipping abuts against the driving shaft 145, and the filter screen 121 cannot slide downward any more, at which time the first driving mechanism 142 remains in the third position; thereafter, when the output push rod 1422 of the first driving mechanism 142 is elongated downward in the third position, due to the guidance of the inclined surface of the stopper 144 and the resetting force of the first elastic member 1425, the first driving mechanism 142 and the second driving mechanism 143 on the left move to the right as a whole, and the first driving mechanism 142 and the second driving mechanism 143 on the right move to the left as a whole, until they run to the second position, so that the first shaft 1451 of the driving shaft 145 can be closely cooperated with the clamping groove 1222 of the first support frame 122 again, and the synchronous motion cooperation mode is switched. Thereafter, the output push rod 1422 of the first driving mechanism 142 continues to elongate upward, which can realize the downward resetting of the filter screen 121 until the filter screen 121 returns to the air inlet 111 again.

[0095] Referring to Figure 3 and Figure 13The smoke baffle assembly 13 is arranged on the side of the filter screen assembly 12 towards the inside of the cabinet 1, and the range hood further comprises a cleaning device 3 arranged between the smoke baffle assembly 13 and the filter screen assembly 12. The smoke baffle assembly 13 is arranged corresponding to the air inlet 111 and comprises a first smoke baffle 131, a second smoke baffle 132 and a second support frame 133. The second support frame 133 is fixed to the inside of the cabinet 11, and the first smoke baffle 131 and the second smoke baffle 132 are arranged left and right in the second support frame 133. The sum of the lengths of the first smoke baffle 131 and the second smoke baffle 132 in the left-right direction is less than the length of the air inlet 111 in the left-right direction, so that the first smoke baffle 131 and the second smoke baffle 132 can move left and right in the second support frame 133. The height of the first smoke baffle 131 and the second smoke baffle 132 is adapted to the height of the air inlet 111 (not less than the height of the air inlet 111, and preferably equal or close to the height of the air inlet 111).

[0096] The air inlet assembly 1 further comprises a second movement mechanism for driving the first smoke baffle 131 and the second smoke baffle 132 to move. The second movement mechanism has two, and each is a linear drive module. Figure 14 and Figure 15 Each second movement mechanism comprises a first motor 151 and a screw rod 152. The screw rod 152 extends left and right through the first smoke baffle 131 and the second smoke baffle 132. The first motor 151 can drive the screw rod 152 to rotate around its own axis. The screw rod 152 is rotationally supported in the second support frame 133 by a support seat 153 (the screw rod 152 can only rotate). The screw rod 152 of one of the second movement mechanisms is threadedly connected with the first smoke baffle 131, and the second smoke baffle 132 is smoothiy connected with the screw rod 152 (i.e., the hole through which the screw rod 152 passes in the second smoke baffle 132 is a via hole rather than a threaded hole). The screw rod 152 of the other second movement mechanism is threadedly connected with the second smoke baffle 132, and the first smoke baffle 131 is smoothiy connected with the screw rod 152 (i.e., the hole through which the screw rod 152 passes in the first smoke baffle 131 is a via hole rather than a threaded hole). Thus, when the screw rod 152 rotates, it can drive the corresponding smoke baffle to move left and right. The screw rods 152 of the two second movement mechanisms can be arranged up and down so that the two smoke baffles are free to drive and do not interfere with each other. The second movement mechanism further comprises a slide rod 154 parallel to the screw rod 152, which is fixed in the second support frame 133 and also passes through the first smoke baffle 131 and the second smoke baffle 132 to support and guide the movement of the first smoke baffle 131 and the second smoke baffle 132.

[0097] Referring to Figure 13 , Figure 16 and Figure 17The first and second smoke baffles 131 and 132 are hollow and open towards the front side of the filter screen 121. The cleaning device 3 is disposed at least partially in each smoke baffle and comprises a roller brush 31 and a second moving mechanism for driving the roller brush 31 to rotate. The roller brush 31 is partially disposed in the first and second smoke baffles 131 and 132 and protrudes forward of the respective smoke baffles to contact the filter screen 121. The height of the roller brush 31 is adapted to the height of the filter screen 121 so that the cleaning range covers the height direction of the filter screen 121. At least two roller brushes 31 can be disposed in each smoke baffle and arranged left and right. A driving seat 32 and a base 33 for supporting the roller brush 31 are further disposed in each smoke baffle. The driving seat 32 and the base 33 are rotatably supported in the respective smoke baffles. The driving seat 32 is rotatable relative to the smoke baffle, while the base 33 is rotatable and vertically movable relative to the smoke baffle (the base 33 can be limited in vertical movement by a shaft or the like). The upper and lower ends of each roller brush 31 are respectively mounted with the driving seat 32 and the base 33 to rotate synchronously.

[0098] The third moving mechanism drives the roller brushes 31 to rotate, in this embodiment, about a vertical axis, or when the front side surface of the box body 11 is inclined, the rotation axes of the roller brushes 31 are inclined at the same angle. In this embodiment, the third moving mechanism comprises a second motor 351, a driving gear 352 driven to rotate by the second motor 351, and a transmission gear 353 disposed on the driving seat 32 of each roller brush 31. The rotation axes of the gears extend in the vertical direction (or can be inclined according to the arrangement of the box body 11). The driving gear 352 is engaged with the closest transmission gear 353, and the adjacent transmission gears 353 are engaged with each other, so that the third moving mechanism drives the roller brushes 31 to rotate synchronously.

[0099] In combination with Figure 18 and Figure 19 the upper and lower ends of each roller brush 31 are provided with protruding mounting columns 311. One end of the upper and lower ends of the roller brush 31, such as the upper end of the mounting column 311, is supported in the driving seat 32, and the other end of the upper and lower ends of the roller brush 31, such as the lower end of the mounting column 311, is supported in the base 33. The driving seat 32 and the base 33 are formed with supporting grooves 321, Figure 18 and Figure 19The cooperation mode of the driving seat 32, the base 33 and the rolling brush 31 is the same as that of the driving seat 32 and the rolling brush 31. Through the cooperation of the mounting column 311 and the driving seat 32 (the base 33), the driving seat 32, the rolling brush 31 and the base 33 rotate synchronously. The mounting column 311 is a non-cylindrical column, so as to transmit the rotating movement. In this embodiment, the mounting column 311 is in the shape of a hexagonal prism. The supporting groove 321 is also in the shape of a hexagonal prism, which is adapted to the shape and size of the mounting column 311. The second elastic member 34 is arranged between the bottom surface of the base 33 and the bottom surface of each smoke baffle, which makes the rolling brush 31 keep moving upward and abutting against the driving seat 32. When it is needed to disassemble the rolling brush 31, the first driving mechanism 142 is started to run to the second position, so as to lift the filter screen assembly 121 upward, expose the cleaning device 3, and then only need to press the rolling brush 31 downward together with the base 33 until the mounting column 311 at the upper end is separated from the supporting groove 321 of the driving seat 32, so as to take down the rolling brush 31 to put into a dishwasher or manually clean. After cleaning, the mounting column 311 at the lower end of the rolling brush 31 is mounted into the base 33, and then the mounting column 311 at the upper end of the rolling brush 31 is mounted into the driving seat 32, so as to complete the installation of the rolling brush 31. The rolling brush 31 can also be cleaned by driving the rolling brush 31 to rotate at high speed through the third movement mechanism without disassembling the rolling brush 31.

[0100] Since the smoke baffle assembly 13 is a movable component, the cleaning length range of the rolling brush 31 can cover the length of the filter screen 121 along with the movement of the corresponding smoke baffle. In addition, even if the third movement mechanism is not started, the rolling brush 31 can also move relative to the filter screen 121 to wipe and clean the filter screen 121 due to the movement of the first smoke baffle 131 and / or the second smoke baffle 132.

[0101] In the above embodiment, two smoke baffles are taken as an example for description, and the number of smoke baffles can also be one or more than two. The sum of the lengths (the size in the left-right direction) of the smoke baffles is less than the length of the air inlet 111.

[0102] Referring to Figure 2 and Figure 3 , the range hood further comprises a smoke sensor 4 arranged at a position above the air inlet 111 on the front side (the outer side) of the cabinet 11, a first wind speed sensor 51 arranged on the left and right sides of the air inlet 111 respectively, a second wind speed sensor 52 arranged on the left and right sides of the air inlet 111 respectively, and a thickness sensor 6 arranged above the air inlet 111 on the inner side of the cabinet 11 for detecting the thickness of oil, wherein the first wind speed sensor 51 is arranged on the outer side of the cabinet 11, the second wind speed sensor 52 is arranged on the inner side of the cabinet 11, and the thickness sensor 6 can be a distance sensor.

[0103] Referring to Figure 20The cleaning procedure of the filter screen 121 of the present application includes the following steps in the control flow:

[0104] 1) The range hood is started, and it is detected whether the range hood has not been used for a certain period of time, such as 20 days. If yes, it indicates that the oil stains on the filter screen 121 will become sticky due to long-term lack of cleaning, and therefore the filter screen front and back cleaning procedure is entered after this cooking is finished, and the cleaning procedure is ended after cleaning is completed. If no, step 2) is entered.

[0105] 2) It is judged whether the filter screen 121 needs to be cleaned. Here, the wind speed attenuation value detected by the first wind speed sensor 51 and the second wind speed sensor 52 can be used for judgment, and a threshold value of the wind speed attenuation value can be pre-set. When the threshold value is exceeded, it is judged that cleaning is needed. This judgment method is a prior art, and will not be described here. If it is judged that the filter screen 121 needs to be cleaned, step 3) is entered. If it is judged that the filter screen 121 does not need to be cleaned, the filter screen turning procedure is started after each cooking is finished, so that the relatively clean surface of the filter screen 121 is exposed. Since the smoke baffle assembly 13 is arranged on the inner side of the filter screen 121, when oil fume escapes during cooking, the first smoke baffle 31 and the second smoke baffle 32 will move, and then the rolling brush 31 plays a primary cleaning role for the internal filter screen 121. Therefore, the relatively clean surface of the filter screen 121 is exposed by starting the filter screen turning procedure after cooking is finished.

[0106] 3) When cooking, the range hood is in a working state, the first driving mechanism 142 is located at the first position, and at this time the exposed surface of the filter screen 121 is the front surface and the inward surface is the back surface. After this cooking is finished, the first driving mechanism 142 is operated from the first position to the second position, and the filter screen 121 is lifted away from the air inlet 111. Then the oil thickness on the front surface of the filter screen 121 is detected by the thickness sensor 6 above the air inlet 111. If it is detected that the oil thickness on the front surface exceeds the pre-set threshold value, the front surface of the filter screen 121 needs to be cleaned, and step 4) is entered. If it is detected that the oil thickness on the front surface does not exceed the pre-set threshold value, it indicates that the front surface of the filter screen 121 does not need to be cleaned, and step 7) is entered.

[0107] 4) The second driving mechanism 143 drives the filter screen 121 to rotate 180°, and then the first driving mechanism 142 is operated to the third position, so that the driving shaft 145 and the first support frame 122 are switched to the relative sliding cooperation mode, and the filter screen 121 slides downward under the action of gravity. At this time, the front surface of the filter screen 121 has been turned to face the inside of the box body 11 (close to the cleaning device 3), and then the first driving mechanism 142 is operated to the second position.

[0108] 5) The first driving mechanism 142 continues to run to the first position, the filter screen 121 is reset to the air inlet 111, the third movement mechanism drives the roller brush 31 to rotate, and the front surface of the filter screen 121 is cleaned;

[0109] 6) After cleaning, the first driving mechanism 142 runs to the second position again;

[0110] 7) The thickness of the oil dirt on the back surface of the filter screen 121 (at this time, the back surface of the filter screen 121 faces forward) is detected; if the thickness of the oil dirt on the back surface is detected to exceed a preset threshold, the back surface of the filter screen 121 needs to be cleaned, and step 8) is entered; if the thickness of the oil dirt on the back surface is detected to be less than the preset threshold, it is indicated that the back surface of the filter screen 121 does not need to be cleaned, and step 10) is entered;

[0111] 8) The second driving mechanism 143 drives the filter screen 121 to rotate by 180°, and the first driving mechanism 142 runs to the third position, so that the driving shaft 145 and the first support frame 122 are switched to the relative sliding fit mode, the filter screen 121 slides downward under the action of gravity, at this time, the back surface of the filter screen 121 is turned to face the box 11 again (faces the cleaning device 3), and then the first driving mechanism 142 runs to the second position;

[0112] 9) The first driving mechanism 142 continues to run to the first position, the filter screen 121 is reset to the air inlet 111, the third movement mechanism drives the roller brush 31 to rotate, and the back surface of the filter screen 121 is cleaned, after cleaning, the cleaning program ends;

[0113] 10) It is judged whether the front surface of the filter screen 121 has met a preset cleaning degree (also by judging the thickness of the oil dirt), if yes, the cleaning program ends, if no, it means that the thickness of the oil dirt on the front and back surfaces of the filter screen 121 is not large, but the pores of the filter screen 121 are blocked, the front and back surface cleaning program of the filter screen 121 is started, the oil dirt in the pores of the filter screen 121 is cleaned by the roller brush 31, and then the cleaning program ends.

[0114] In the above cleaning process, the front and back surface cleaning program of the filter screen 121 includes the following steps:

[0115] S1) The first driving mechanism 142 runs to the first position (if it has been in the first position, it does not act), the position of the filter screen 121 is ensured at the air inlet 111, corresponding to the roller brush 31, the third movement mechanism drives the roller brush 31 to rotate, and the current surface of the filter screen 121 is cleaned;

[0116] S2) After the one-side surface of the filter screen 121 is cleaned, the first driving mechanism 142 runs from the first position to the second position, and the filter screen 121 rises away from the air inlet 111;

[0117] S3) the second driving mechanism 143 drives the filter screen 121 to rotate 180°, and then the first driving mechanism 142 is operated to the third position, so that the driving shaft 145 and the first support frame 122 are switched to the relative sliding fit mode, and the filter screen 121 slides downward under the action of gravity;

[0118] S4) the first driving mechanism 142 is operated to the first position, the filter screen 121 is reset to the air inlet 111, the third movement mechanism drives the roller brush 31 to rotate, and the surface currently corresponding to the filter screen 121 is cleaned, so that the front and back surface cleaning is completed.

[0119] In the above cleaning process, the filter screen 121 turning procedure includes the following steps:

[0120] S1) the first driving mechanism 142 is operated to the second position (if it has been in the second position, no action is taken);

[0121] S2) the second driving mechanism 143 drives the filter screen 121 to rotate 180°, and then the first driving mechanism 142 is operated to the third position, so that the driving shaft 145 and the first support frame 122 are switched to the relative sliding fit mode, and the filter screen 121 slides downward under the action of gravity;

[0122] S3) the first driving mechanism 142 is operated to the first position, the filter screen 121 is reset to the air inlet 111, and the turning of the filter screen 121 is achieved.

[0123] In addition, in order to reduce the escape of oil fumes, as described above, the smoke sensors 4 are arranged on the front side (outer side) of the box body 11, and in this embodiment, five smoke sensors 4 are arranged with the length of each smoke baffle being one fourth of the length of the air inlet 111. The five smoke sensors 4 are denoted as S1, S2, S3, S4 and S5 from left to right, wherein S1 is located at the leftmost side, and S5 is located at the rightmost side. The smoke sensors 4 are uniformly arranged on the left and right sides, and the interval distance is the length of the smoke baffle. The control method of the smoke baffle assembly 13 of the present application is described in detail with reference to Figure 21 , which includes the following steps:

[0124] 1) start, the range hood is started;

[0125] 2) collect the smoke concentration data of the five points on the upper end of the filter screen 121;

[0126] 3) average the five smoke concentration data to obtain SV, average the smoke concentration data of S1 and S2 to obtain S12, average the smoke concentration data of S1 and S3 to obtain S13, average the smoke concentration data of S3 and S5 to obtain S35, and average the smoke concentration data of S4 and S5 to obtain S45,

[0127] 3) judge S12-SV whether is greater than preset oil fume concentration difference first threshold value, if yes, enter step 4), if no, then enter step 11);

[0128] 4) judge S12>S45 whether is established, if yes, enter step 5), if no, then enter step 8);

[0129] 5) judge this time for left side cooker to open, adjust two smoke baffle to move to right side and occupy S3-S5 position, see Figure 22-1 ; during moving, first smoke baffle 131 keep in the left side of second smoke baffle 132;

[0130] 6) then judge S4>S35 whether is established, if yes, indicate that there is oil fume to escape to right side, enter step 7), if no, then smoke baffle does not need to act, no oil fume escape occurs:

[0131] 7) drive first smoke baffle 131 to move to left side ΔL, see Figure 22-2 , then judge again S4>S35 whether is established, if yes, continue to drive first smoke baffle 131 to move to left side ΔL until S4≤S35, then first smoke baffle 131 reset (return to step 5 position); If no, then indicate that the oil fume that escapes has been sucked in, first smoke baffle 131 reset (return to step 5 position); After first smoke baffle 131 reset, control program ends;

[0132] 8) judge this time for right side cooker to open, adjust two smoke baffle to move to left side and occupy S1-S3 position, see Figure 22-3 ; during moving, first smoke baffle 131 keep in the left side of second smoke baffle 132;

[0133] 9) then judge S2>S13 whether is established, if yes, indicate that there is oil fume to escape to left side, enter step 10), if no, then smoke baffle does not need to act, no oil fume escape occurs:

[0134] 10) drive second smoke baffle 132 to move to right side ΔL, see Figure 22-4 , then judge again S2>S13 whether is established, if yes, continue to drive second smoke baffle 132 to move to right side ΔL until S2≤S13, then second smoke baffle 132 reset (return to step 8 position); If no, then indicate that the oil fume that escapes has been sucked in, second smoke baffle 132 reset (return to step 8 position); After second smoke baffle 132 reset, control program ends;

[0135] 11) judge again S45-SV whether is greater than threshold value, if yes, enter step 12), if no, then smoke baffle assembly 13 present stage does not need to act;

[0136] 12) judge that the left and right stoves are opened at the same time, adjust the two smoke baffles to occupy S2-S4, see Figure 22-5 ; during the movement, the first smoke baffle 131 remains on the left side of the second smoke baffle 132;

[0137] 13) judge whether S12-S45>0 is true, if yes, it means that the left oil fume is greater than the right oil fume, then move the second smoke baffle 132 to the right side by △L, at this time, there is a smoke inlet channel with a distance of △L between the two smoke baffles, see Figure 22-6 , then enter step 14); if not, enter step 15);

[0138] 14) judge whether S12>S3 is true, if yes, it means that the left oil fume is still relatively large, then drive the first smoke baffle 131 to move to the right by △L, see Figure 22-7 , return to step 13); if not, the smoke baffle assembly 13 does not need to act at this stage, and the control program ends;

[0139] 15) judge whether S12-S45<0 is true, if yes, it means that the right oil fume is greater than the left oil fume, then move the first smoke baffle 131 to the left side by △L, at this time, there is a smoke inlet channel with a distance of △L between the two smoke baffles, see Figure 22-8 , then enter step 16); if not, the smoke baffle assembly 13 does not need to act at this stage;

[0140] 16) judge whether S45>S3 is true, if yes, it means that the right oil fume is still relatively large, then drive the second smoke baffle 131 to move to the left side by △L, see Figure 22-9 , return to step 13); if not, the smoke baffle assembly 13 does not need to act at this stage, and the control program ends.

Claims

1. A range hood, comprising an air inlet assembly (1), the air inlet assembly (1) comprising a box (11) and a filter screen assembly (12), the box (11) being provided with an air inlet (111); the filter screen assembly (12) comprising a filter screen (121) corresponding to the air inlet (111), the filter screen (121) having a front face facing the outside of the box (11) and a back face facing the inside of the box (11); characterized in that: the air inlet assembly (1) further comprises a first movement mechanism for driving the filter screen (121) to turn over, the first movement mechanism comprising: a first driving mechanism (142) being a linear driving module; and a second driving mechanism (143) being a rotary driving module, provided at the output end of the first driving mechanism (142), the second driving mechanism (143) being in transmission connection with the filter screen (121); the first driving mechanism (142) being capable of operating to at least three positions: a first position, in which the filter screen (121) is driven to be located at the air inlet (111), at this time, the output end of the second driving mechanism (143) and the filter screen (121) are in a synchronous movement cooperation mode; a second position, in which the filter screen (121) is driven to be located above the air inlet (111), at this time, the output end of the second driving mechanism (143) and the filter screen (121) are in the synchronous movement cooperation mode, and the second driving mechanism (143) can drive the filter screen (121) to rotate, so as to turn over the front and back faces of the filter screen (121); and a third position, in which the filter screen (121) is driven to be located above the air inlet (111), at this time, the output end of the second driving mechanism (143) and the filter screen (121) are in a relative sliding cooperation mode, the filter screen (121) can slide relative to the output end of the second driving mechanism (143), and the sliding direction is the same as the linear movement direction of the output of the first driving mechanism (142). The output end of the second driving mechanism (143) is in transmission connection with the filter screen (121) through a driving shaft (145), the driving shaft (145) switches the cooperation mode with the filter screen (121) through movement in the left-right direction. The filter screen assembly (12) further comprises first support frames (122) provided at the left and right sides of the filter screen (121), the filter screen (121) being fixed with the first support frames (122). ​ ​ ​ ​ ​ ​ 2. The hood according to claim 1, characterized in that: ​ 3. The hood according to claim 2, characterized in that: ​ The first support frame (122) is internally formed with a support sliding groove (1221), the upper and lower ends of the support sliding groove (1221) are respectively formed with a clamping groove (1222), the end of the driving shaft (145) matched with the first support frame (122) comprises a first shaft (1451) and a second shaft (1452), the length of the first shaft (1451) is shorter than the length of the second shaft (1452), when the first shaft (1451) and the second shaft (1452) are clamped in the clamping groove (1222), the driving shaft (145) and the first support frame (122) are in a synchronous motion matching mode; when the first shaft (1451) is disengaged from the clamping groove (1222), the second shaft (1452) is in sliding cooperation with the support sliding groove (1221), and the driving shaft (145) and the first support frame (122) are in a relative sliding cooperation mode.

4. The hood according to claim 3, characterized in that: The clamping groove (1222) is in a cross shape, and the first shaft (1451) and the second shaft (1452) are both cuboids and arranged in a cross shape.

5. The hood according to claim 2, characterized in that: The second driving mechanism (143) is located on the left side and / or the right side of the filter screen (121), each second driving mechanism (143) corresponds to a first driving mechanism (142), the first driving mechanism (142) and the corresponding second driving mechanism (143) can move left and right in the box body (11), when the second driving mechanism (143) is close to the filter screen (121), the driving shaft (145) and the first support frame (122) are in a synchronous motion matching mode, when the second driving mechanism (143) is away from the filter screen (121), the driving shaft (145) and the first support frame (122) are in a relative sliding cooperation mode, and the second driving mechanism (143) maintains a tendency of moving close to the filter screen (121).

6. The hood according to claim 5, characterized in that: The first motion mechanism further comprises a frame (141) fixedly arranged in the box body (11), the first driving mechanism (142) is arranged in the frame (141) and can move left and right relative to the frame (141), and the first motion mechanism further comprises a stop block (144) arranged in the frame (141), the bottom surface of the stop block (144) is in an inclined surface, so that when the second driving mechanism (143) moves upward along the bottom surface of the stop block (144), the second driving mechanism (143) gradually moves away from the filter screen (121).

7. The hood according to claim 6, characterized in that: The first driving mechanism (142) comprises a body (1421) and an output push rod (1422) which can be telescoped up and down relative to the body (1421), the second driving mechanism (143) is arranged on the output push rod (1422), the frame (141) further comprises a first elastic member (1425), the first elastic member (1425) and the stop block (144) are arranged on opposite sides of the body (1421) respectively, and the first elastic member (1425) makes the body (1421) maintain a tendency of moving back to the stop block (144).

8. The hood according to any one of claims 1-7, characterized in that: The range hood further comprises a smoke baffle assembly (13) arranged in the cabinet (11), the smoke baffle assembly (13) is arranged corresponding to the air inlet (111), and the smoke baffle assembly (13) comprises at least one smoke baffle capable of moving left and right relative to the cabinet (11).

9. The hood according to claim 8, characterized in that: The smoke baffles are arranged left and right, the sum of the lengths of the smoke baffles is less than the length of the air inlet (111), and the air inlet assembly (1) further comprises a second movement mechanism for driving the smoke baffles to move, the second movement mechanism is a linear driving module, and each smoke baffle corresponds to a second movement mechanism.

10. The hood according to claim 8, characterized in that: The smoke baffles are hollow and open towards the side of the filter screen (121), and the range hood further comprises a cleaning device (3) for cleaning the filter screen (121), the cleaning device (3) is at least partially arranged in each smoke baffle.

11. The hood according to claim 10, characterized in that: The cleaning device (3) comprises a roller brush (31) and a third movement mechanism for driving the roller brush (31) to rotate, the roller brush (31) is partially arranged in the smoke baffle and protrudes forward from the smoke baffle to contact the filter screen (121).

12. The hood according to claim 11, characterized in that: The smoke baffles are arranged left and right, the sum of the lengths of the smoke baffles is less than the length of the air inlet (111), and the air inlet assembly (1) further comprises a second movement mechanism for driving the smoke baffles to move, the second movement mechanism is a linear driving module, and each smoke baffle corresponds to a second movement mechanism.

13. The hood according to any one of claims 1-7, characterized in that: The cabinet (11) further comprises a cleaning device (3) for cleaning the filter screen (121).

14. A control method of the range hood according to claim 13, the range hood further comprising a thickness sensor (6) for detecting the thickness of the oil, provided inside the cabinet (11) above the air inlet (111), characterized in that: The control method comprises the following steps: 1) The range hood is started, whether the range hood is not used for more than a predetermined time is detected, if yes, a filter screen front and back cleaning program is entered, the front and back of the filter screen (121) are cleaned by turning the filter screen (121), and the cleaning program is ended after cleaning; if not, step 2) is entered; 2) whether the filter screen (121) needs to be cleaned is judged, if yes, step 3) is entered; if not, the filter screen (121) is turned over after each cooking is finished; 3) during cooking, the first driving mechanism (142) is located at the first position, the exposed surface of the filter screen (121) is regarded as the front surface, and the inward surface is regarded as the back surface; after this cooking is finished, the first driving mechanism (142) is operated from the first position to the second position, the oil thickness of the front surface of the filter screen (121) is detected by the thickness sensor (6), if it is detected that the oil thickness of the front surface exceeds a predetermined threshold, step 4) is entered; if it is detected that the oil thickness of the front surface does not exceed the predetermined threshold, step 7) is entered; 4) the second driving mechanism (143) drives the filter screen (121) to rotate by 180°, then the first driving mechanism (142) is operated to the third position, the filter screen (121) slides downward under the action of gravity, and then the first driving mechanism (142) is operated to the second position; 5) the first driving mechanism (142) continues to run to the first position, the filter screen (121) resets to the air inlet (111), and the cleaning device (3) cleans the front surface of the filter screen (121); 6) after cleaning, the first driving mechanism (142) runs to the second position again; 7) the thickness of the oil dirt on the back surface of the filter screen (121) is detected; if the thickness of the oil dirt on the back surface exceeds the preset threshold, step 8) is entered; if the thickness of the oil dirt on the back surface does not exceed the preset threshold, step 10) is entered; 8) the second driving mechanism (143) drives the filter screen (121) to rotate 180°, while the first driving mechanism (142) runs to the third position, the filter screen (121) slides downward under the action of gravity, and then the first driving mechanism (142) runs to the second position; 9) the first driving mechanism (142) continues to run to the first position, the filter screen (121) resets to the air inlet (111), and the cleaning device (3) cleans the back surface of the filter screen (121), and after cleaning, the cleaning program ends; 10) it is judged whether the front surface of the filter screen (121) has met the preset cleaning degree, if yes, the cleaning program ends, and if no, the front and back surface cleaning program of the filter screen (121) is started, the front and back surfaces of the filter screen (121) are cleaned by turning over the filter screen (121), and then the cleaning program ends.

15. The control method of claim 14, wherein: The front and back surface cleaning program of the filter screen (121) comprises the following steps: S1) the first driving mechanism (142) runs to the first position, and the cleaning device (3) cleans the current corresponding surface of the filter screen (121); S2) after the cleaning of one side surface of the filter screen (121) is completed, the first driving mechanism (142) runs from the first position to the second position, and the filter screen (121) rises away from the air inlet (111); S3) the second driving mechanism (143) drives the filter screen (121) to rotate 180°, and then the first driving mechanism (142) runs to the third position, and the filter screen (121) slides downward under the action of gravity; S4) the first driving mechanism (142) runs to the first position, the filter screen (121) resets to the air inlet (111), and the cleaning device (3) cleans the current corresponding surface of the filter screen (121), thereby completing the front and back surface cleaning.

16. The control method of claim 14, wherein: The turning over program of the filter screen (121) comprises the following steps: S1) the first driving mechanism (142) runs to the second position; S2) the second driving mechanism (143) drives the filter screen (121) to rotate 180°, while the first driving mechanism (142) runs to the third position, and the filter screen (121) slides downward under the action of gravity; S3) the first driving mechanism (142) runs to the first position, the filter screen (121) resets to the air inlet (111), and the turning over of the filter screen (121) is realized.

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