Range hood and control method thereof

Abstract

The present invention discloses a range hood and a control method thereof, wherein the range hood comprises a filter assembly, wherein the filter assembly comprises a filter screen made of a soft material and arranged in the air duct of the range hood, wherein the filter screen is used to filter the oil smoke passing through the air duct, and wherein the range hood further comprises a filter screen support rotatably arranged in the air duct, wherein the filter screen support is located upstream of the filter screen on the oil smoke flow path, wherein the filter screen support can be rotated to contact with the surface of the filter screen facing the oil smoke, thereby driving the corresponding part of the filter screen to move along the oil smoke flow direction, thereby changing the shape of the filter screen and thus changing the contact area with the oil smoke. Thus, the shape of the filter screen can be adjusted so that the contact area with the oil smoke can be increased as the oil smoke concentration increases, thereby reducing the wind resistance and reducing the maintenance cycle of the filter screen.

Description

Technical Field

[0001] The invention relates to an oil fume purification device, in particular to a range hood and a control method of the range hood. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics. A centrifugal fan installed inside the range hood absorbs and exhausts oil smoke, and uses a filter to filter out some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, negative pressure suction is generated at the center of the fan, sucking the oil smoke under the range hood into the fan. After being accelerated by the fan, it is collected by the volute and guided to be discharged outdoors.

[0003] With the continuous advancement of range hood self-cleaning technology, steam cleaning or water cleaning has been widely used in the field of range hood self-cleaning. The basic principle is that the steam generator generates steam or the water pump pumps water, and the steam or water is transported to the nozzle at the end of the nozzle. The steam or water is quickly ejected from the nozzle to flush the impeller and volute for cleaning.

[0004] The filters currently used in range hoods are usually metal meshes, placed at the air inlet. There are double-layer buckle type, labyrinth type, single-layer grille mesh, etc. There are also porous metal or foam sponge, metal wire and other materials used as filters. The metal labyrinth mesh has a greater impact on the air volume, especially at high gears, the air volume loss is obvious, it is easy to leak smoke, and it needs to be cleaned regularly. Although porous metal and foam sponge have less wind resistance, the gaps are small and are easily blocked by oil, which increases the wind resistance, and it is more troublesome to clean, and the maintenance and cleaning cycle is short. No matter which filter is used, it needs to be cleaned regularly after a long time, which will cause unnecessary trouble to the user.

[0005] In addition, there is a type of filter that does not require cleaning. It is directly replaced according to the frequency of use and the degree of contamination of the filter. This not only causes a waste of resources, but the discarded oil screen will also pollute the environment. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a range hood that can reduce wind resistance and shorten the maintenance cycle of the filter in view of the deficiencies in the above-mentioned prior art.

[0007] The second technical problem to be solved by the present invention is to provide a control method for the above range hood.

[0008] The third technical problem to be solved by the present invention is to provide a cleaning control method for the above range hood.

[0009] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a range hood, comprising a filter assembly, wherein the filter assembly comprises a filter screen made of a soft material and arranged in the air duct of the range hood, wherein the filter screen is used to filter the oil smoke passing through the air duct, and wherein:

[0010] The range hood further comprises a filter support rotatably arranged in the air duct. On the oil fume flow path, the filter support is located upstream of the filter. The filter support can be rotated to contact the surface of the filter facing the oil fume, thereby driving the corresponding part of the filter to move along the oil fume flow direction, thereby changing the shape of the filter and thus changing the contact area with the oil fume. In this way, the shape of the filter can be adjusted so that the contact area with the oil fume increases as the oil fume concentration increases, thereby reducing the wind resistance and reducing the maintenance cycle of the filter.

[0011] To facilitate setting the filter support and driving the filter support to rotate, the range hood also includes a filter support shaft and a filter support movement mechanism for driving the filter support shaft to rotate around its own axis, and each filter support shaft is fixed to the filter support.

[0012] In order to facilitate the vibration of the filter and promote the cleaning effect of the filter, the range hood further comprises a top block, the filter support shaft is arranged at one end of the filter support, the top block is arranged at one end of the filter support away from the filter support shaft and can contact the filter, and the top block remains connected to the filter support;

[0013] The range hood further comprises a top block movement mechanism for driving the top block to move linearly in a direction close to the filter support axis and away from the filter support axis.

[0014] Preferably, in order to facilitate driving the top block to move, the top block movement mechanism includes a top block driving mechanism, a top block transmission mechanism, a winding shaft, a winding wheel and a top block fastening wire. The winding shaft is parallel to the filter bracket axis and is driven by the top block driving mechanism and the top block transmission mechanism to rotate around its own axis. The winding wheel is arranged on the winding shaft, one end of the top block fastening wire is wound on the winding wheel and the other end is fixed to the top block after passing through the filter bracket, so that the top block can be driven to move in the direction of the filter bracket axis by winding the top block fastening wire on the winding wheel, and the top block maintains a tendency to move away from the filter bracket axis.

[0015] Preferably, the top block movement mechanism further comprises an elastic member arranged between the top block and the filter support, so that the top block maintains a tendency to move in a direction away from the filter support axis.

[0016] Preferably, in order to facilitate guiding the movement of the top block and maintain the connection between the top block and the filter bracket, so that the filter bracket and the top block rotate synchronously, and prevent the top block from falling, the top block movement mechanism also includes a guide column formed at the position where the top block cooperates with the filter bracket and extends into the filter bracket.

[0017] To facilitate guiding the oil smoke, the range hood also includes a guide plate, the filter bracket shaft passes through the guide plate and can rotate relatively, the guide plate is located in the space surrounded by the filter bracket, the filter bracket shaft and the top block, when the top block moves in the direction away from the filter bracket shaft, the top block can be separated from the guide plate to separate the guide plate and the filter bracket, when the top block moves in the direction of the filter bracket shaft, the top block is connected to the guide plate to make the guide plate and the filter bracket shaft rotate synchronously.

[0018] Preferably, in order to facilitate the cooking state of the double stove, the filter support shaft has two and is respectively close to the positions at the two ends of the corresponding filter length direction in the air duct, and the filter support, top block, and guide plate also have two corresponding ones;

[0019] Thus, one group of the filter support, the filter support shaft, the top block and the guide plate constitutes a first guide plate assembly, and the other group of the filter support, the filter support shaft, the top block and the guide plate constitutes a second guide plate assembly.

[0020] In order to facilitate the guidance of oil smoke, the range hood further comprises a guide plate, and the guide plate can be separated from the filter bracket or rotate synchronously with the filter bracket.

[0021] In order to increase the fluidity of the grease on the filter screen, a heating module is arranged inside the guide plate.

[0022] Preferably, to facilitate the setting of the filter bracket, the range hood also includes a guide plate bracket outer frame, the guide plate bracket outer frame is annular and fixed in the air duct, the size and shape of the guide plate bracket outer frame match the air duct, and the filter bracket is rotatably connected to the guide plate bracket outer frame through the filter bracket shaft.

[0023] In order to facilitate the downward collection of oil on the filter screen, each edge of the outer frame of the guide plate bracket is in an arc shape that gradually extends downward from the outside to the inside.

[0024] In order to facilitate the support of the filter and the replacement of the filter so that the unused part is in the air duct, the two ends of the filter in the length direction extend out of the air duct, and the filter assembly also includes a support frame arranged on two opposite sides outside the air duct and a support shaft rotatably supported in the support frame. The part of the filter extending out of the air duct can be wound on the support shaft and fixed to the support shaft at the end; the filter assembly also includes a first motion mechanism for driving the support shaft to rotate around its own axis.

[0025] In order to facilitate the support and extrusion of oil or oil-water mixture on the filter screen, the filter assembly also includes an extrusion assembly rotatably supported in a support frame, and the extrusion assembly includes a first roller and a second roller arranged on opposite sides in the thickness direction of the filter screen, and the first roller and the second roller are both in an extruded state with the filter screen, and the first roller and the second roller can rotate relative to the filter screen and the rotation axis is parallel to the support axis.

[0026] In order to facilitate the discharge and collection of grease squeezed out of the support frame, the range hood also includes a fan frame and a fan system arranged in the fan frame, the air duct is formed in the fan frame, the filter is arranged below the fan system, the bottom of the support frame gradually tilts downward from a position far away from the fan frame to a position close to the fan frame, the support frame is provided with a first oil drain hole at a position adjacent to the fan frame, and second oil drain holes are provided on the left and right sides of the fan frame at positions corresponding to the first oil drain holes of the support frame.

[0027] Preferably, the range hood further comprises a fan frame and a fan system arranged in the fan frame, the air duct is formed in the fan frame, the filter is arranged below the fan system, the fan system comprises a volute and an impeller arranged in the volute, an oil guide plate is arranged below the volute, and the oil guide plate can be located below the volute or rotated to be at least partially located below the volute. This can prevent the grease particles cleaned out from the fan system from secondary contamination of the fan system when the filter is cleaned.

[0028] The technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood as described above, wherein the range hood further comprises a fan frame, a fan system arranged in the fan frame, and an air inlet assembly arranged below the fan frame, the air duct is formed in the fan frame, and the filter is arranged below the fan system, characterized in that the control method comprises the following steps:

[0029] 1) The range hood is started, the first guide plate assembly and the second guide plate assembly are in a default state of being vertically downward, the length direction of the filter is the left-right direction, and the filter support axis extends along the front-back direction;

[0030] 2) Detect the oil smoke concentration values ​​at the left and right smoke inlet positions of the air inlet assembly. The oil smoke concentration value on the left is recorded as N1, and the oil smoke concentration value on the right is recorded as N2. The average concentration in the air duct is Np = (N1 + N2) / 2;

[0031] 3) Determine the relationship between Np and the preset lower limit value Na, middle limit value Nb and upper limit value Nc, and the first guide plate assembly and the second guide plate assembly perform corresponding actions according to the determination result:

[0032] 3.1) If Np≤Na, the second guide plate assembly on the right side is controlled not to move, the first guide plate assembly on the left side is placed horizontally, and then the wind speed value passing through the right part of the filter is determined. If the wind speed value around the right side of the filter exceeds the preset threshold, the first guide plate assembly on the left side is rotated counterclockwise by a certain angle;

[0033] 3.2) If Na<Np≤Nb, the first guide plate assembly and the second guide plate assembly do not act and are in a default state;

[0034] 3.3) If Nb<Np≤Nc, it is necessary to determine whether |N1-N2|>N0 is established, where N0 is the preset threshold value of the difference between the two oil fume concentrations. If not, the first guide plate assembly on the left side rotates counterclockwise by a certain angle, and the second guide plate assembly on the right side rotates clockwise by a certain angle, and each guide plate assembly lifts up the filter at the corresponding position; if yes, it is determined which oil fume concentration is greater on the left and right sides. If the oil fume concentration is greater on the left side, the first guide plate assembly on the left side rotates counterclockwise by a certain angle to lift up the filter at the corresponding position; if the oil fume concentration is greater on the right side, the second guide plate assembly on the right side rotates clockwise by a certain angle to lift up the filter at the corresponding position.

[0035] The technical solution adopted by the present invention to solve the third technical problem is: a cleaning control method of the range hood as described above, characterized in that: the filter assembly also includes an extrusion assembly rotatably supported in a support frame, the extrusion assembly includes a first roller and a second roller arranged on opposite sides in the thickness direction of the filter, the first roller and the second roller are both in an extrusion state with the filter, the first roller and the second roller can rotate relative to the filter and the rotation axis is parallel to the support axis; the cleaning control method includes the following steps:

[0036] 1) The filter is in an initial state, with a rolled filter on one of the support shafts and only one circle wound on the other support shaft, and the number of full-cycle operation of the filter is recorded as n=0;

[0037] 2) The range hood starts to operate and detects whether the air volume attenuation at the upstream and downstream positions of the filter has reached a preset threshold value Vf. If not, the filter continues to stay at the original position. If it has reached the preset threshold value Vf, the first motion mechanism is activated to drive the filter to move toward the support shaft that is only wound once, so that the unused filter part is located in the air duct, and the used filter is wound on the support shaft to which the filter moves; at the same time, the first roller and the second roller start to rotate; after the detection is completed, the fan system is turned off;

[0038] 3) Determine whether the filter has completed a full cycle operation from one support shaft to another support shaft. If not, do not take action. If yes, compare the current full cycle operation number n with the preset full cycle operation number upper limit n0, and then perform corresponding cleaning based on the degree of filter blockage reflected by the judgment result.

[0039] Preferably, in step 3), if n≤n0, the cleaning includes the following steps: the first guide plate assembly on the left side rotates a certain angle to contact the filter screen, the first motion mechanism reverses to move the filter screen, and the top block driving mechanism runs forward and reverse for a certain period of time until the filter screen completes a full cycle operation, and records n=n+1, and ends. Since the number of full cycle operations is small, the degree of contamination and blockage is small, and simple cleaning is performed.

[0040] Preferably, the range hood further comprises a first guide plate assembly located on the left side of the air duct and a second guide plate assembly located on the right side of the air duct, each guide plate assembly comprises the above-mentioned filter holder, each guide plate assembly further comprises a filter holder shaft and a guide plate and a top block capable of rotating with the corresponding filter holder, the guide plate is located between the filter holder and the top block, the top block can contact the filter, and the top block can be driven away from or close to the guide plate by a top block driving mechanism;

[0041] In step 3), if n>n0, the cleaning comprises the following steps:

[0042] 3.2.1) The first motion mechanism is reversed to move the filter screen;

[0043] 3.2.2) At this time, the filter screen is in a horizontal state, the first guide plate assembly on the left side rotates counterclockwise by a certain angle, and the second guide plate assembly on the right side rotates clockwise by the same angle without contacting the filter screen; the first motion mechanism is reversed to move the filter screen;

[0044] 3.2.3) Detect the wind speed loss at the upstream and downstream positions of the filter to determine the cleanliness of the filter. After the detection is completed, the fan system is shut down; the corresponding level of impact wind speed V is matched according to the degree of air volume loss caused by the blockage of the detected filter. 冲 ; According to the impact wind speed V 冲 Adjust the angle θ between each guide plate assembly and the horizontal direction;

[0045] 3.2.4) After the filter completes a full cycle, the fan system starts, and the first motion mechanism starts once at a certain interval, driving the filter to move in the opposite direction. During this process, the first guide plate assembly and the second guide plate assembly rotate to contact the filter, and the top block drive mechanism moves forward and reversely to cause the filter to vibrate until the filter completes a full cycle, and then the value of n is reset to 0. Due to the large number of full cycle operations, the degree of pollution and blockage is large, and a major cleaning is required.

[0046] In step 3.2.3), the cross-sectional area S of the air duct through which the oil smoke passes is related to the angle θ between each guide plate assembly and the horizontal direction. Where A is the distance between the upper ends of the two guide plate assemblies, B is the width of each guide plate assembly, L is the length of the complete air duct, the width of each guide plate assembly is L / 2, Q is the flow rate of the range hood at a fixed gear when cleaning the filter, V 冲 is the wind speed fitted according to the filter blockage degree, and thus according to different impact wind speeds V 冲 Adjust θ.

[0047] In order to increase the fluidity of the grease on the filter screen and promote cleaning, a heating module is provided in the guide plate. Before step 3.2.1), the heating module is started.

[0048] Compared with the prior art, the advantages of the present invention are:

[0049] 1. The shape of the filter can be adjusted so that the contact area with the oil fume increases as the concentration of oil fume increases, thereby reducing the wind resistance and the maintenance cycle of the filter;

[0050] 2. According to the needs, such as the wind speed difference between the upstream and downstream of the filter, the contaminated filter part in the air duct can be replaced with an uncontaminated filter;

[0051] 3. It can self-clean according to the contamination of the filter, without the need for users to manually clean the filter;

[0052] 4. The filter screen is cleaned by using the guide plate assembly, fan system and other structures, without water, and the user operation is simple;

[0053] 5. The setting of the guide plate assembly can not only distribute the air intake to the left and right by rotating the angle of the guide plate assembly, but also realize the vibration and oil shaking cleaning of the filter through the movement of the top block. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic diagram of a range hood according to an embodiment of the present invention (part of the fan frame is hidden);

[0055] Figure 2 for Figure 1 A cross-sectional view of

[0056] Figure 3 for Figure 1 Schematic diagram of the fan system and oil guide assembly of the range hood;

[0057] Figure 4 is a schematic diagram of a filter assembly of a range hood according to an embodiment of the present invention;

[0058] Figure 5 for Figure 4A schematic diagram of the partial decomposition structure of the filter component;

[0059] Figure 6 It is a schematic diagram of an extrusion amount adjustment component of a filter component of a range hood according to an embodiment of the present invention;

[0060] Figure 7 Schematic diagram of the initial state of the filter of the range hood according to an embodiment of the present invention;

[0061] Figure 8 It is a schematic diagram of the filter screen of the range hood according to the embodiment of the present invention completing a full cycle movement from the initial state;

[0062] Fig. 9 is a schematic diagram of a guide plate assembly of a range hood according to an embodiment of the present invention;

[0063] Fig.10 for Fig. 9 A schematic diagram of a guide assembly hiding one of the guides;

[0064] Fig.11 for Fig. 9 A partial cross-sectional view of a smoke guide plate assembly;

[0065] Fig.12 It is a partial schematic diagram of a guide plate support assembly of a range hood according to an embodiment of the present invention;

[0066] Fig.13 It is a partial schematic diagram of a guide plate support assembly of a range hood according to an embodiment of the present invention;

[0067] Fig.14 It is a schematic diagram of the assembly state of the left filter support and the guide plate of the range hood according to an embodiment of the present invention;

[0068] Fig.15 It is a schematic diagram of the state where the left filter support and the guide plate of the range hood are separated according to an embodiment of the present invention;

[0069] Fig.16 This is a structural principle diagram of a range hood according to an embodiment of the present invention when a fan system is used to clean a filter;

[0070] Fig.17 A schematic diagram of a working state of a range hood according to an embodiment of the present invention;

[0071] Fig.18 A schematic diagram of a working state of a range hood according to an embodiment of the present invention;

[0072] Fig.19 for Fig.18 A schematic diagram of a fan system and an oil guide assembly of a range hood;

[0073] Fig. 20A schematic diagram of a range hood in a working state according to an embodiment of the present invention;

[0074] Fig.21 A schematic diagram of a range hood in a working state according to an embodiment of the present invention;

[0075] Fig. 22 A schematic diagram of a range hood in a working state according to an embodiment of the present invention;

[0076] Fig.23 This is a flow chart of the control of filter shape change of a range hood according to an embodiment of the present invention;

[0077] Fig.24 This is a flow chart of filter cleaning control for a range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0078] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0079] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0080] See also Figure 1 to Figure 3 A range hood includes an air intake assembly 1, a fan system 2 and a fan frame 3. The fan system 2 may be a centrifugal fan. The fan frame 3 is located above the air intake assembly 1 and is hollow inside to form an air duct. The fan system 2 is located at an upper position inside the fan frame 3. The air intake assembly 1 may be in the form of a fume hood, so that the range hood as a whole is a top-suction range hood. Optionally, the air intake assembly 1 may also be in any other existing form.

[0081] In order to solve the problem of maintenance-free fan system 2, a more feasible way is to install a filter assembly at the air duct position. The filter assembly is partially arranged in the air duct and partially arranged outside the air duct. In this embodiment, the filter assembly is arranged at the fan frame 3, partially located in the fan frame 3, and partially located outside the fan frame 3. The filter assembly part located in the fan frame 3 is below the fan system 2, that is, on the oil fume flow path, and is located upstream of the fan system 2.

[0082] The fan system 2 includes a volute 21 and an impeller 22 disposed in the volute 21. An oil guide assembly 4 is disposed at the bottom of the volute 21, including a mounting bracket 41, an oil guide plate driving mechanism 42 and an oil guide plate 43. The mounting bracket 41 is fixed to the bottom of the volute 21. The oil guide plate 43 is in a downwardly concave arc shape, and its length direction is in the same direction as the axial direction of the impeller 22, such as in the present embodiment, both are in the front-to-back direction, and the left and right sides of the oil guide plate 43 are higher than the middle. In normal use, the oil guide plate 43 is located below the volute 21, so that the grease discharged from the volute 21 will first drip onto the arc-shaped oil guide plate 43, then flow down from the rear wall of the fan frame 3 along the guide plate 43, and then be discharged into the oil cup 7 below the air inlet assembly 1, so that the oil in the volute 21 can be prevented from directly dripping onto the filter screen 51 (to be described in detail below) to contaminate the filter screen 51. The oil guide plate driving mechanism 42 is preferably a motor, which can drive the oil guide plate 43 to rotate around the vertical axis. The position where the oil guide plate 43 is connected to the oil guide plate 43 is offset relative to the length of the oil guide plate 43, such as close to the front side of the oil guide plate 43 in this embodiment, so that the oil guide plate 43 can be driven to rotate at least partially to the front side and below the volute 21, see Fig.19 .

[0083] See also Figure 2 , Figure 4 , Figure 5 and Figure 6 Specifically, the filter assembly includes a filter 51, a support frame 52 arranged on opposite sides of the outside of the fan frame 3, a first roller 53, a second roller 54, a support shaft 55 and an extrusion amount adjustment assembly 56. The filter 51 can be made of a porous, adsorbable, oil-conducting soft material (such as polyurethane foam sponge) and is in a long strip shape. The support frame 52 is preferably arranged on the left and right sides of the fan frame 3, so that the length direction of the filter 51 is the left and right direction, and the width direction of the filter 51 is the front and back direction. A support shaft 55 is arranged in each support frame 52, and the support shaft 55 extends forward and backward and is rotatably supported in the support frame 52. The two ends of the filter 51 are respectively wound on the support shaft 55, and the first circle of the filter 51 can be fixed to the support shaft 55, such as by bonding. By driving the support shaft 55 to rotate (the rotation axis extends in the front-to-back direction and is the axis of the support shaft 55 itself), the part of the filter 51 located in the fan frame 3 can be driven to move left and right, while the part wound on the support shaft 55 continues to be wound or loosened for several turns.

[0084] To facilitate driving the support shaft 55 to rotate, the filter assembly also includes a first motion mechanism 58, which includes a first drive mechanism 581 and a first transmission mechanism 582. In the present embodiment, the first drive mechanism 581 is a motor, and the first transmission mechanism 582 is a gear set. The primary gear of the gear set is arranged on the output shaft of the first drive mechanism 581, and the final gear of the gear set is arranged on the support shaft 55. Thus, through the transmission of the gear set, the output of the first drive mechanism 581 can be transmitted to the support shaft 55, thereby driving the support shaft 55 to rotate.

[0085] The first roller 53 and the second roller 54 constitute an extrusion assembly. A group of extrusion assemblies are arranged in each support frame 52, and are respectively located on opposite sides of the filter screen 51 in the thickness direction. For example, in this embodiment, the first roller 53 is located above the filter screen 51, and the second roller 54 is located below the filter screen 51, and both are in an extruded state with the filter screen 51. The first roller 53 and the second roller 54 can be rotatably supported in the support frame 52. The extrusion assembly needs to be arranged in the straight part of the filter screen 51, and cannot be arranged in the winding part of the filter screen 51. The extrusion assembly plays a role in guiding and squeezing oil for the filter screen 51. The filter screen 51 is a soft material. After the liquid oil stains adhere to it, it will be squeezed by the two rollers of the extrusion assembly, and a part of the liquid oil stains on the filter screen 51 will be squeezed off. The rotation axis of the two rollers is parallel to the support shaft 55.

[0086] The bottom of the support frame 52 gradually tilts downward from a position away from the fan rack 3 to a position close to the fan rack 3. The support frame 52 is provided with a first oil drain hole 521 at a position adjacent to the fan rack 3. Second oil drain holes 31 are provided on the left and right sides of the fan rack 3 at positions corresponding to the first oil drain hole 521 of the support frame 52. Therefore, the oil squeezed out by the extrusion assembly enters the inner wall surface of the fan rack 3 from the support frame 52 through the first oil drain hole 521 and the second oil drain hole 31, and is finally discharged into the oil cup 7.

[0087] The filter assembly also includes a second motion mechanism 59, including a second drive mechanism 591 and a second transmission mechanism 592. In the present embodiment, the second drive mechanism 591 is a motor, and the second transmission mechanism 592 is a gear set. The primary gear of the gear set is arranged on the output shaft of the second drive mechanism 591, and the final gear of the gear set is arranged on the support shaft 55. Thus, through the transmission of the gear set, the output of the second drive mechanism 591 can be transmitted to the shaft of the first roller 53, driving the first roller 53 to rotate, which can promote the movement of the filter screen 51, and the second roller 54 is driven by the movement of the filter screen 51.

[0088] See also Figure 5 and Figure 6In order to be applicable to filter screens 51 of different thicknesses and to match different cleanliness levels, the filter assembly further includes an extrusion adjustment assembly 56, which includes a roller 561, a roller bracket 562, a first elastic member 563, a first fixed bracket 564 and an adjustment screw 565. The first fixed bracket 564 is fixed to the outside of the support frame 52, the adjustment screw 565 passes through the first fixed bracket 564 from bottom to top and is threadedly connected to the first fixed bracket 564, the roller bracket 562 is arranged at the top of the adjustment screw 565, the roller 561 is rotatably arranged on the roller bracket 562, and the rotation axis of the roller 561 is parallel to the rotation axis of the second roller 54. The end of the second roller 54 extends out of the support frame 52, and the roller 561 contacts the axis of the second roller 54, and can push the second roller 54 upward when the roller 561 rises. By adjusting the upper and lower positions of the screw 565 relative to the first fixed bracket 564, the spacing between the upper and lower rollers can be changed. The smaller the spacing, the greater the amount of extrusion deformation, the more oil is squeezed, and the better the cleaning. However, considering the elastic recovery of the filter 51, the gap can be adjusted according to the actual performance of the filter 51. The outer periphery of the adjusting screw 565 is provided with a first elastic member 563, and the first elastic member 563 is respectively in contact with the roller bracket 562 and the first fixed bracket 564, so that when the adjusting screw 565 is downward, the elasticity of the first elastic member 563 drives the roller bracket 562 to reset downward. In this embodiment, the first elastic member 563 is a spring. The extrusion amount adjustment component 56 can also adopt other schemes, as long as the relative position of the second roller 54 and the filter 51 can be changed to change the degree of extrusion.

[0089] See also Figure 2 , Figures 9 to 13 A guide plate support assembly 6 is provided below the portion of the filter screen 51 located inside the fan frame 3, comprising a first guide plate assembly 61, a second guide plate assembly 62 and a guide plate support outer frame 63. The guide plate support outer frame 63 is annular, preferably, an annular rectangular, adapted to the shape of the inner cross section of the fan frame 3, and fixed to the inner side of the fan frame 3, and oil smoke can pass through the guide plate support outer frame 63. In order to better guide the oil stains flowing down from the inner wall of the fan frame 3 and the filter screen 51 into the guide plate support outer frame 63, the edges of the guide plate support outer frame 63 are in an arc shape extending gradually downward from the outside to the inside, so that the oil stains will pass through the guide plate support outer frame 63 along the arc and be discharged into the oil cup 7.

[0090] The first guide plate assembly 61 and the second guide plate assembly 62 have the same structure. Each guide plate assembly includes a filter support 611, a filter support shaft 612, a top block 613, a top block fixing column 614 and a guide plate 615. The filter support 611 has two spaced apart along the width direction of the filter 51. In this embodiment, they are arranged on the front and rear sides of the guide plate 615 and are located on the inner side of the guide plate support outer frame 63. The filter support shaft 612 extends forward and backward, and both ends pass through the filter support 611 at the corresponding position and are respectively rotatably connected to the guide plate support outer frame 63, so that the filter support 611 can rotate around the filter support shaft 612. The filter support shafts 612 of the two guide plate assemblies are respectively arranged at positions close to the left and right sides of the guide plate support outer frame 63, and each filter support shaft 612 corresponds to an end of the filter 51 located in the air duct in the length direction of the filter. The top block 613 is arranged at one end of the two filter supports 611 away from the filter support shaft 612, and the guide plate 615 is arranged in the space surrounded by the two filter supports 611, the filter support shaft 612 and the top block 613. The filter support shaft 612 passes through the guide plate 615 and can rotate relatively, and the top block 613 can move relative to the guide plate 615 in a direction close to the filter support shaft 612 or in a direction away from the filter support shaft 612 (such as Fig. 9 The top block 613 is provided with the top block fixing column 614 on one side facing the guide plate 615, and a matching fixing groove 6151 is formed at the corresponding position of the guide plate 615, into which the top block fixing column 614 can be inserted. The front and rear ends of the top block 613 are connected to the filter support 611. When the top block fixing column 614 is inserted into the fixing groove 6151 of the guide plate 615, the guide plate 615 can rotate synchronously with the filter support 611. When the top block fixing column 614 is disengaged from the fixing groove 615 of the guide plate 615, the guide plate 615 is separated from the filter support 611, and due to the relationship of gravity, the guide plate 615 is in a vertical state. A heating module 616 is provided in the guide plate 615, and the heating module 616 can be a heating film or other commonly used heating devices. Alternatively, the guide plate 615 can also rotate synchronously with the filter support 611.

[0091] Each guide plate assembly also includes a filter support movement mechanism 617 for driving the filter support 611 to rotate and a top block movement mechanism 618 for driving the top block 613 to move. The filter support movement mechanism 617 includes a filter support driving mechanism 6171 and a filter support transmission mechanism 6172. Preferably, the filter support driving mechanism 6171 is a worm motor fixed to the outer side of the filter support 611 away from the guide plate 615, and the filter support transmission mechanism 6172 is preferably a worm gear formed at the end of the filter support shaft 612 passing through the filter support 611, thereby driving the filter support shaft 612 to rotate around its own axis. The filter support movement mechanism 617 can also use other existing motion mechanisms that can output torque.

[0092] The top block movement mechanism 618 includes a top block driving mechanism 6181 and a top block transmission mechanism 6182. The top block driving mechanism 6181 is preferably a motor, which is fixed to the side of the filter support shaft 612 away from the guide plate 615. The top block transmission mechanism 6182 is preferably a gear set, and the primary gear of the gear set is arranged on the output shaft of the top block driving mechanism 6181. The top block movement mechanism 618 also includes a winding shaft 6183, a winding wheel 6184 and a top block fastening wire 6185. The winding shaft 6183 is arranged on the side of the filter support shaft 612 away from the guide plate 615 and is parallel to the filter support shaft 612. Its two ends are respectively connected to the guide support outer frame 63 for rotation. The final gear of the above-mentioned gear set is arranged on the winding shaft 6183 and can drive the winding shaft 6183 to rotate around its own axis. The aforementioned winding wheels 6184 are respectively provided at the front and rear ends of the winding shaft 6183 , one end of the top block fastening wire 6185 is wound around the winding wheel 6184 , and the other end passes through the filter bracket 611 and is fixed to the top block 613 .

[0093] The front and rear ends of the top block 613 are bent toward the filter support 611, and the top block motion mechanism 618 also includes a guide column 6186 formed at each end of the top block 613 and extending into the filter support 611, so that the filter support 611 can guide the movement of the top block 613. The top block motion mechanism 618 also includes an elastic member 6187, preferably a spring, disposed between the end of the top block 613 and the filter support 611, and its two ends are respectively in contact with the filter support 611 and the top block 613, so that the top block 613 maintains a tendency to move in a direction away from the guide plate 615. The top block motion mechanism 6181 can also adopt other existing motion mechanisms that can output linear motion.

[0094] See also Fig.14 , the guide plates 615 are in a vertical state. When the side corresponding to the guide plate 615 needs to enter the air, the top block driving mechanism 6181 is started, driving the winding shaft 6183 to rotate clockwise, so that the top block 613 of the first guide plate assembly 61 on the left side will move downward under the action of the elastic member 6187 due to the lack of the tension of the top block fastening wire 6185. At this time, the top block fixing column 614 will be separated from the fixing groove 6151 on the guide plate 615, and the filter bracket 611 will get rid of the guide plate 615. Fig.15 , after which the filter support driving mechanism 6171 is started, so that the filter support 611 is no longer in a vertical position, and then the top block driving mechanism 6181 is started, and the top block 613 is pulled back to its original position through the top block fastening line 6185. After that, the filter support 611 can be driven by the filter support driving mechanism 6171 to drive the filter support shaft 612 to drive the filter support 611 to rotate upward at any angle, and contact the surface of the filter 51 facing the oil smoke, and then continue to rotate to push the filter 51 to deform, so as to achieve the change of the shape of the filter 51 without affecting the air volume.

[0095] See also Fig.15 , the guide plates 615 are all in a vertical state, the top block 613 is separated from the guide plate 615, that is, the filter bracket 611 is separated from the guide plate 615. When the guide plate 615 on the left side is needed to act as a guide plate, the filter bracket driving mechanism 6171 drives the filter bracket 611 to be in a vertical downward position parallel to the guide plate 615, and then the top block driving mechanism 6181 is started and rotated counterclockwise to pull the top block 613 back to its original position. At this time, the top block fixing column 614 will be inserted into the fixing groove 6151 of the guide plate 615, so that the rotation of the filter bracket 611 can drive the rotation of the guide plate 615 (the guide plate 615 and the filter bracket 611 are integrated into one). When the filter bracket 611 rotates upward at any angle and contacts the surface of the filter 51 facing the oil smoke, and then continues to rotate to push the filter 51 to deform, the corresponding guide plate 615 plays a role of diversion.

[0096] When the fan system 2 is used to clean the filter 51, if there is no oil guide plate 43 to block it, small oil droplets in the cleaning process will be sucked into the impeller 22, causing secondary pollution. Therefore, when the fan system 22 is used to clean the filter 51, the oil guide plate driving mechanism 42 will drive the oil guide plate 43 to rotate 180 degrees so that it at least partially extends forward beyond the volute 21. Fig.19 In this way, when the high-speed airflow hits the filter screen 51, the wind passes through the filter screen 51 from the gap between the left and right guide plate assemblies, and the oil droplets that are washed down will hang on the arc surface of the oil guide plate 53. Preferably, the oil guide plate 53 can be tilted upward from front to back at this time, so that the grease will be brought to the front wall surface of the fan frame 3 and then discharged into the oil cup 7.

[0097] A wind speed sensor 81 is also provided in the fan frame 3. There are at least two wind speed sensors 81, which are respectively located upstream and downstream of the filter 51. In this embodiment, wind speed sensors 81 are provided on the left and right sides of the fan frame 3. A smoke concentration sensor 82 is provided at the air inlet of the air inlet assembly 1.

[0098] The relationship between filter shape and oil fume concentration also involves control methods. For details, see Fig.23 , including the following steps:

[0099] 1) The range hood is started, and the first guide plate assembly 61 and the second guide plate assembly 62 are in a default state of being vertically downward;

[0100] 2) Detect the oil smoke concentration values ​​at the left and right smoke inlet positions of the air inlet component 1. The oil smoke concentration value on the left is recorded as N1, and the oil smoke concentration value on the right is recorded as N2. At this time, the average concentration Np in the air duct will be judged, Np = (N1 + N2) / 2; the oil smoke concentration value can be detected by a common smoke sensor;

[0101] 3) Determine the relationship between Np and the preset lower limit value Na, middle limit value Nb and upper limit value Nc, and each guide plate component performs corresponding actions according to the judgment result:

[0102] 3.1) If Np≤Na, it is a case of small oil smoke, and a large flow area is not required. In order to reduce the pollution of oil smoke to the filter 51, the second guide plate assembly 62 on the right side is controlled not to move, and the first guide plate assembly 61 on the left side is placed horizontally, see Figure 2 , and also judges the wind speed value passing through the right part of the filter 51. If the wind speed value around the right side of the filter 51 exceeds a preset threshold, the first guide plate assembly 61 on the left side will rotate counterclockwise to properly guide and distribute the flow on the left side. This preset threshold can be measured in the laboratory in the early stage;

[0103] 3.2) If Na<Np≤Nb, the first guide plate assembly 61 and the second guide plate assembly 62 do not act and are in a default state;

[0104] 3.3) If Nb<Np≤Nc, it is necessary to determine whether |N1-N2|>N0 is established, where N0 is the preset threshold of the difference between the two oil fume concentrations. If not, the first guide plate assembly 61 on the left side rotates counterclockwise by a certain angle, and the second guide plate assembly 62 on the right side rotates clockwise by a certain angle. Each guide plate assembly pushes up the filter screen 51 at the corresponding position (i.e., pushes up in the direction downstream of the filter screen 51 on the oil fume flow path), so that the filter screen 51 is arranged in a trapezoidal shape, see Fig. 20 If yes, it is determined which of the left and right sides has a greater oil fume concentration. If the oil fume concentration on the left side is greater, the first guide plate assembly 61 on the left side is rotated counterclockwise by a certain angle to lift the filter screen 51 at the corresponding position upward (i.e., lift it toward the downstream direction of the filter screen 51 on the oil fume flow path). The filter screen 51 is arranged in a manner that the right side is lower and the left side is higher. See Fig.21 If the oil smoke concentration on the right side is high, the second guide assembly 62 on the right side rotates clockwise by a certain angle to lift the filter 51 at the corresponding position upward (i.e., lift it toward the downstream direction of the filter 51 on the oil smoke flow path). The filter 51 is arranged in a way that the left side is low and the right side is high. Fig. 22 .

[0105] In the above steps, the filter support 611 and the guide plate 615 of the guide plate assembly that needs to be moved are preferably in a separated state.

[0106] The above preset values ​​can be obtained through experiments. In addition, during the movement of the filter 51, if the deformation of the filter 51 is not enough to meet the demand for shape change, the first movement mechanism 58 and the second drive mechanism 59 on one side should be started to increase the length of the filter 51 located in the fan frame 3, so that the filter 51 has enough length in the fan frame 3 to support the above movement.

[0107] The cleaning process and operation control method of the filter 51 are mainly determined by the number of full-cycle operations of the filter 51 (from the left side of the filter being fully wound and the right side having only one turn to the left side of the filter having only one turn to the right side of the filter being fully wound, or vice versa) and the wind speed difference between the upper and lower positions of the filter 51 when the filter 51 is working. For details, see Fig.24 , including the following steps:

[0108] 1) The filter screen 51 is in an initial state. The initial state is assumed to be that there is a rolled filter screen 51 on the left side and only one circle is wound on the support shaft 55 on the right side. Figure 7 , that is, the filter screen 51 is at the left position, and the number of full cycle operations of the filter screen 51 is recorded as n=0;

[0109] 2) The range hood starts to operate, and the wind speed sensor 81 is used to detect whether the air volume attenuation at the upstream and downstream positions of the filter 51 has reached the preset threshold value Vf. If not, the filter 51 continues to stay at the original position and does not move; if the preset threshold value Vf is reached, the first motion mechanism 58 is started, driving the filter 51 to move to the right, so that the clean filter 51 on the left occupies the air duct, and the blocked filter 51 is wound on the support shaft 55 on the right; at the same time, the second motion mechanism 59 is started, squeezing the filter 51 to release oil during the movement of the filter 51; after the detection is completed, the fan system 2 is closed;

[0110] 3) Then determine whether the filter 51 has completed a full cycle operation from left to right. The status after the full cycle operation is completed is shown in FIG. Figure 8 , there is a rolled filter screen 51 on the right side, and only one circle is wound on the support shaft 55 on the left side. If no, no action is taken. If yes, the number of full cycle operations is determined, and then corresponding operations are performed according to the results of the determination. The more times, the more serious the blockage:

[0111] 3.1) If n≤n0, n0 is the preset upper limit of the number of full-cycle operations, such as 3, which can be set as needed, then the first guide plate assembly 51 on the side rotates a certain angle to contact the filter 51, and then the first motion mechanism 58 reverses (opposite to step 2), so that the filter 51 moves from right to left, the extrusion assembly squeezes oil, and the top block driving mechanism 6181 runs forward and reverse for a certain time, such as 2 to 3 minutes. This process is achieved by the forward and reverse jogging of the top block driving mechanism 6181 and the elastic member 632 to realize the up and down movement of the top block 613 (the amplitude of the up and down movement should be less than the length of the top block fixing column 614 to prevent the guide plate 615 from detaching from the filter bracket 611), which can cause the filter 51 to shake up and down, and a large part of the grease will be thrown off until the filter 51 completes from right to left, and n=n+1 is recorded, and the process ends; in this process, the extrusion assemblies on the left and right sides, especially the first roller 53 and the second roller 54 on the right side squeeze oil;

[0112] 3.2) If n>n0, the following steps are included:

[0113] 3.2.1) The heating module 616 built into the guide plate 615 is started, so that the heating module 616 in the guide plate 615 can radiantly heat the filter screen 51 in the air duct to increase the fluidity of the grease;

[0114] 3.2.2) Then the first moving mechanism 58 is reversed to make the filter screen 51 move from right to left. During this process, the squeezing components on the left and right sides, especially the first roller 53 and the second roller 54 on the right side, squeeze the oil;

[0115] 3.2.3) At this time, the filter screen 51 is in a horizontal state, the first guide plate assembly 61 on the left side rotates counterclockwise by a certain angle, and the second guide plate assembly 62 on the right side rotates clockwise by the same angle without contacting the filter screen 51; the oil guide plate driving mechanism 42 drives the oil guide plate 43 to rotate 180°, see Fig.18 and Fig.19 The first motion mechanism 58 is reversed so that the filter screen 51 moves from left to right, and the extrusion assembly squeezes out the oil;

[0116] 3.2.4) The fan system 2 and the wind speed sensor 81 are started to detect the wind speed loss at the upstream and downstream positions of the filter 51 to determine the cleanliness of the filter 51. After the detection is completed, the fan system 2 is turned off; the corresponding level of impact wind speed V is matched according to the detected air volume loss caused by the blockage of the filter 51 冲 , the impact wind speed V 冲 The determination can be calibrated based on the previous laboratory test. For example, if the wind speed loss of the filter 51 is detected to be 0-10%, then the required cleaning wind speed is V 小 If the wind speed loss of the filter is detected to be between 10% and 30%, the required cleaning wind speed is V 中 ; If the wind speed loss of filter 51 is detected to be more than 30%, the required cleaning wind speed is V 大 ; Since we know the required impact wind speed V 冲 , and the air volume Q of the fan system 2 at a fixed gear is also certain, that is, The cross-sectional area S of the air duct through which the oil smoke passes is related to the angle θ between each guide plate assembly and the horizontal direction, see Fig.16 (The arrow shows the direction of oil smoke flow), cross-sectional area Where A is the distance between the upper ends of the two guide plate assemblies, B is the width of each guide plate assembly (the dimension in the front-to-back direction), L is the length of the complete air duct (the dimension in the left-right direction) (complete means when it is not blocked by the guide plate assembly), the width of each guide plate assembly is L / 2, Q is the flow rate of the range hood cleaning filter at the fixed gear, V 冲The wind speed fitted according to the degree of filter blockage can be stored in the laboratory after testing in advance, and the data can be retrieved for matching when needed;

[0117] 3.2.5) According to the degree of clogging of the filter 51, the angle θ between each guide plate assembly and the horizontal direction is adjusted. That is, if the pollution is large, the distance between the two guide plate assemblies is small, so that the wind speed is fast and the oil pollution can be better impacted, but the cleaning time will be very long; if the pollution is small, the distance between the two guide plate assemblies can be appropriately enlarged, so as to reduce the cleaning time and energy waste; for example, if the wind speed loss of the filter 51 is detected to be 0-10%, the distance between the two guide plate assemblies is the first distance; if the wind speed loss of the filter is detected to be 10-30%, the distance between the two guide plate assemblies is the second distance; if the wind speed loss of the filter 51 is detected to be more than 30%, the distance between the two guide plate assemblies is the third distance; the first distance, the second distance and the third distance are reduced in sequence;

[0118] 3.2.6) After the filter 51 has run through a full cycle from left to right, the filter 51 has completed two roller oil squeezing cleanings, and the fan system 2 is started. At a certain interval, such as 1 minute, the first motion mechanism 58 is started once (the rotation direction is opposite to step 3.2.3)), driving the filter 51 to move from right to left. During this process, the first guide plate assembly 61 and the second guide plate assembly 62 rotate to contact the filter 51, and the top block driving mechanism 6181 is jogged forward and reversely to cause the filter 51 to vibrate and cooperate with the filter 51 to remove oil until the left side of the filter 51 becomes fully loaded, and then the value of n is reset to 0.

Claims

1. A range hood, comprising a filter assembly, the filter assembly comprising a filter screen (51) made of a soft material and arranged in an air duct of the range hood, the filter screen (51) being used to filter oil smoke passing through the air duct, characterized in that: The range hood further comprises a filter support (611) rotatably arranged in the air duct; in the oil fume flow path, the filter support (611) is located upstream of the filter (51); the filter support (611) can be rotated to contact the surface of the filter (51) facing the oil fume, thereby driving the corresponding part of the filter (51) to move along the oil fume flow direction, thereby changing the shape of the filter (51) and further changing the contact area with the oil fume; The range hood further comprises a filter support shaft (612) and a filter support movement mechanism (617) for driving the filter support shaft (612) to rotate around its own axis, and each filter support shaft (612) is fixed to the filter support (611); The range hood further comprises a top block (613), the filter support shaft (612) being arranged at one end of the filter support (611), the top block (613) being arranged at one end of the filter support (611) away from the filter support shaft (612) and being able to contact the filter (51), and the top block (613) being kept connected to the filter support (611); The range hood further comprises a top block movement mechanism (618) for driving the top block (613) to move linearly in a direction close to the filter support axis (612) and away from the filter support axis (612); The top block movement mechanism (618) comprises a top block driving mechanism (6181), a top block transmission mechanism (6182), a winding shaft (6183), a winding wheel (6184) and a top block fastening wire (6185); the winding shaft (6183) is parallel to the filter support shaft (612) and is driven by the top block driving mechanism (6181) and the top block transmission mechanism (6182) to rotate around its own axis; the winding wheel (6184) is arranged on the winding shaft (6183), one end of the top block fastening line (6185) is wound on the winding wheel (6184) and the other end is fixed to the top block (613) after passing through the filter bracket (611), so that the top block (613) can be driven to move in the direction of the filter bracket shaft (612) by winding the top block fastening line (6185) on the winding wheel (6184), and the top block (613) maintains a tendency to move in the direction away from the filter bracket shaft (612).

2. The range hood according to claim 1, characterized in that: The top block movement mechanism (618) further includes an elastic member (6187) disposed between the top block (613) and the filter support (611), so that the top block (613) maintains a tendency to move in a direction away from the filter support shaft (612).

3. The range hood according to claim 1, characterized in that: The top block movement mechanism (618) further includes a guide column (6186) formed at a position where the top block (613) cooperates with the filter support (611) and extending into the filter support (611).

4. The range hood according to claim 1, characterized in that: The range hood further comprises a guide plate (615), the filter support shaft (612) passes through the guide plate (615) and can rotate relatively thereto; the guide plate (615) is located in a space enclosed by the filter support (611), the filter support shaft (612) and the top block (613); when the top block (613) moves in a direction away from the filter support shaft (612), the top block (613) can separate from the guide plate (615) so that the guide plate (615) and the filter support (611) are separated; when the top block (613) moves in a direction of the filter support shaft (612), the top block (613) is connected to the guide plate (615) so that the guide plate (615) and the filter support shaft (612) rotate synchronously.

5. The range hood according to claim 4, characterized in that: The filter support shaft (612) has two and is respectively close to the positions of the two ends of the corresponding filter (51) in the length direction in the air duct, and the filter support (611), the top block (613), and the guide plate (615) also have two corresponding ones; Thus, one group of the filter support (611), the filter support shaft (612), the top block (613) and the guide plate (615) constitutes a first guide plate assembly (61), and the other group of the filter support (611), the filter support shaft (612), the top block (613) and the guide plate (615) constitutes a second guide plate assembly (62).

6. The range hood according to claim 1, characterized in that: The range hood further comprises a guide plate (615), and the guide plate (615) can be separated from the filter support (611) or rotate synchronously with the filter support (611).

7. The range hood according to any one of claims 4 to 6, characterized in that: A heating module (616) is disposed inside the guide plate (615).

8. The range hood according to claim 1, characterized in that: The range hood further comprises a guide plate support outer frame (63), the guide plate support outer frame (63) is annular and fixed in the air duct, the size and shape of the guide plate support outer frame (63) are matched with the air duct, and the filter support (611) is rotatably connected to the guide plate support outer frame (63) via a filter support shaft (612).

9. The range hood according to claim 8, characterized in that: Each edge of the guide plate support outer frame (63) is in an arc shape that gradually extends downward from the outside to the inside.

10. The range hood according to claim 1, characterized in that: The filter screen (51) has two ends extending out of the air duct in the length direction. The filter assembly further comprises a support frame (52) arranged on two opposite sides outside the air duct and a support shaft (55) rotatably supported in the support frame (52). The portions of the filter screen (51) extending out of the air duct can be respectively wound around the support shaft (55) and fixed to the support shaft (55) at the ends. The filter assembly further comprises a first motion mechanism (58) for driving the support shaft (55) to rotate around its own axis.

11. The range hood according to claim 10, characterized in that: The filter assembly further comprises an extrusion assembly rotatably supported in a support frame (52), the extrusion assembly comprising a first roller (53) and a second roller (54) arranged on opposite sides of the filter screen (51) in a thickness direction, the first roller (53) and the second roller (54) both being in an extruded state with the filter screen (51), the first roller (53) and the second roller (54) being rotatable relative to the filter screen (51) and the rotation axis being parallel to the support shaft (55).

12. The range hood according to claim 10, characterized in that: The range hood further comprises a fan frame (3) and a fan system (2) arranged in the fan frame (3); the air duct is formed in the fan frame (3); the filter screen (51) is arranged below the fan system (2); the bottom of the support frame (52) gradually tilts downward from a position away from the fan frame (3) to a position close to the fan frame (3); the support frame (52) is provided with a first oil drain hole (521) at a position adjacent to the fan frame (3); and second oil drain holes (31) are provided on left and right sides of the fan frame (3) at positions corresponding to the first oil drain holes (521) of the support frame (52).

13. The range hood according to claim 1, characterized in that: The range hood further comprises a fan frame (3) and a fan system (2) arranged in the fan frame (3); the air duct is formed in the fan frame (3); the filter screen (51) is arranged below the fan system (2); the fan system (2) comprises a volute (21) and an impeller (22) arranged in the volute (21); an oil guide plate (43) is arranged below the volute (21); the oil guide plate (43) can be located below the volute (21) or rotated to be at least partially located below the volute (21).

14. A control method for a range hood according to claim 5, wherein the range hood further comprises a fan frame (3), a fan system (2) arranged in the fan frame (3), and an air inlet assembly (1) arranged below the fan frame (3), wherein the air duct is formed in the fan frame (3), and the filter (51) is arranged below the fan system (2), and wherein: The control method comprises the following steps: 1) The range hood is started, the first guide plate assembly (61) and the second guide plate assembly (62) are in a default state of being vertically downward, the length direction of the filter (51) is the left-right direction, and the filter support shaft (612) extends along the front-back direction; 2) Detect the oil smoke concentration values ​​at the left and right smoke inlet positions of the air inlet component (1), the oil smoke concentration value on the left side is recorded as N1, and the oil smoke concentration value on the right side is recorded as N2, and the average concentration in the air duct is obtained as Np = (N1 + N2) / 2; 3) determining the relationship between Np and a preset lower limit value Na, an intermediate limit value Nb and an upper limit value Nc, and the first guide plate assembly (61) and the second guide plate assembly (62) perform corresponding actions according to the determination result: 3.1) If Np≤Na, the second guide plate assembly (62) on the right side is controlled not to move, the first guide plate assembly (61) on the left side is placed horizontally, and then the wind speed value passing through the right side of the filter (51) is determined. If the wind speed value around the right side of the filter (51) exceeds a preset threshold, the first guide plate assembly (61) on the left side is rotated counterclockwise by a certain angle; 3.2) If Na<Np≤Nb, the first guide plate assembly (61) and the second guide plate assembly (62) do not operate and are in a default state; 3.3) If Nb<Np≤Nc, it is necessary to determine whether |N1-N2|>N0 is established, where N0 is a preset threshold value of the difference between the two oil fume concentrations. If not, the first guide plate assembly (61) on the left side is rotated counterclockwise by a certain angle, and the second guide plate assembly (62) on the right side is rotated clockwise by a certain angle, and each guide plate assembly lifts up the filter screen (51) at the corresponding position; if yes, it is determined which oil fume concentration is greater, the left side or the right side. If the oil fume concentration is greater on the left side, the first guide plate assembly (61) on the left side is rotated counterclockwise by a certain angle, and the filter screen (51) at the corresponding position is lifted up; if the oil fume concentration is greater on the right side, the second guide plate assembly (62) on the right side is rotated clockwise by a certain angle, and the filter screen (51) at the corresponding position is lifted up.

15. A range hood cleaning control method as claimed in claim 10, characterized in that: The filter assembly further comprises an extrusion assembly rotatably supported in a support frame (52), the extrusion assembly comprising a first roller (53) and a second roller (54) arranged on opposite sides of the filter screen (51) in a thickness direction, the first roller (53) and the second roller (54) both being in an extrusion state with the filter screen (51), the first roller (53) and the second roller (54) being rotatable relative to the filter screen (51) and the rotation axis being parallel to the support shaft (55); the cleaning control method comprises the following steps: 1) The filter screen (51) is in an initial state, one of the support shafts (55) has a rolled filter screen (51), and the other support shaft (55) is only wound once, and the number of full cycle operations of the filter screen (51) is recorded as n=0; 2) The range hood starts to operate and detects whether the air volume attenuation at the upstream and downstream positions of the filter (51) reaches a preset threshold value Vf. If not, the filter (51) continues to stay at the original position. If it reaches the preset threshold value Vf, the first motion mechanism (58) is activated to drive the filter (51) to move in the direction of the support shaft (55) that is only wound once, so that the unused portion of the filter (51) is located in the air duct, while the used filter (51) is wound on the support shaft (55) to which the filter (51) moves; at the same time, the first roller (53) and the second roller (54) start to rotate; after the detection is completed, the fan system (2) is turned off; 3) It is then determined whether the filter screen (51) has completed a full cycle operation of completely moving from one support shaft (55) to another support shaft (55). If not, no action is taken. If yes, the current full cycle operation number n is compared with a preset upper limit value n0 of the full cycle operation number. Then, the filter screen (51) is cleaned accordingly based on the degree of blockage reflected by the determination result.

16. The range hood cleaning control method according to claim 15, characterized in that: In step 3), if n≤n0, the cleaning includes the following steps: the first guide plate assembly (61) on the left side rotates a certain angle to contact the filter (51), the first motion mechanism (58) reverses to move the filter (51), the top block driving mechanism (6181) runs forward and reverse for a certain period of time until the filter (51) completes a full cycle operation, records n=n+1, and ends.

17. The range hood cleaning control method according to claim 15, characterized in that: The range hood further comprises a first guide plate assembly (61) located on the left side of the air duct and a second guide plate assembly (62) located on the right side of the air duct, each guide plate assembly comprises the above-mentioned filter support (611), each guide plate assembly further comprises a filter support shaft (612) and a guide plate (615) and a top block (613) capable of rotating with the corresponding filter support (611), the guide plate (615) being located between the filter support (611) and the top block (613), the top block (613) being capable of contacting the filter (51), and the top block (613) being capable of moving away from or approaching the guide plate (615) by being driven by a top block driving mechanism (6181); In step 3), if n>n0, the cleaning comprises the following steps: 3.2.1) The first motion mechanism (58) is reversed to move the filter screen (51); 3.2.2) At this time, the filter screen (51) is in a horizontal state, the first guide plate assembly (61) on the left side rotates counterclockwise by a certain angle, and the second guide plate assembly (62) on the right side rotates clockwise by the same angle without contacting the filter screen (51); the first motion mechanism (58) is reversed to move the filter screen (51); 3.2.3) Detect the wind speed loss at the upstream and downstream positions of the filter (51) to determine the cleanliness of the filter (51), and after the detection is completed, the fan system (2) is turned off; according to the detected air volume loss caused by the blockage of the filter (51), the corresponding level of impact wind speed V is matched 冲 ; According to the impact wind speed V 冲 Adjust the angle θ between each guide plate assembly and the horizontal direction; 3.2.4) After the filter (51) completes a full cycle of operation, the fan system (2) is started, and at regular intervals, the first motion mechanism (58) is started once to drive the filter (51) to move in the reverse direction. During this process, the first guide plate assembly (61) and the second guide plate assembly (62) rotate to contact the filter (51), and the top block driving mechanism (6181) is moved forward and reversely to cause the filter (51) to vibrate until the filter (51) completes a full cycle of operation, and then the value of n is reset to 0.

18. The range hood cleaning control method according to claim 17, characterized in that: In step 3.2.3), the cross-sectional area S of the air duct through which the oil smoke passes is related to the angle θ between each guide plate assembly and the horizontal direction. Where A is the distance between the upper ends of the two guide plate assemblies, B is the width of each guide plate assembly, L is the length of the complete air duct, the width of each guide plate assembly is L / 2, Q is the flow rate of the range hood at a fixed gear when cleaning the filter, V 冲 is the wind speed fitted according to the blockage degree of the filter (51), and thus according to different impact wind speeds V 冲 Adjust θ.

19. The range hood cleaning control method according to claim 17, characterized in that: A heating module (616) is disposed inside the guide plate (615), and the heating module (616) is started before step 3.2.1).

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