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 upper drive assembly and a filter screen lower drive assembly; the filter screen upper drive assembly can drive the corresponding part of the filter screen to move along the oil smoke flow direction, and the filter screen lower drive assembly can drive the corresponding part of the filter screen to move along the opposite direction of the oil smoke flow, thereby changing the shape of the filter screen and thus changing the contact area with the oil smoke. Compared with the prior art, the present invention has the advantages that 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 fumes, 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 fumes under the range hood into the fan. After being accelerated by the fan, the fumes are 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 screen drive component and a filter screen lower drive component;

[0011] The filter driving assembly comprises a first steering column assembly and a flexible first belt-shaped component, the first steering column assembly is in contact with the surface of the filter facing the oil smoke, the first belt-shaped component is connected to the first steering column assembly, and the first steering column assembly is driven to move by tightening and loosening the first belt-shaped component;

[0012] The filter lower driving assembly comprises a second steering column assembly and a flexible second belt-shaped component, wherein the second steering column assembly contacts the surface of the filter that faces away from the oil smoke, and the second belt-shaped component is connected to the second steering column assembly, and the second steering column assembly is driven to move by tightening and loosening the second belt-shaped component;

[0013] Therefore, the upper filter driving component can drive the corresponding part of the filter to move along the direction of oil fume flow, and the lower filter driving component can drive the corresponding part of the filter to move in the opposite direction of oil fume flow, thereby changing the shape of the filter and then changing the contact area with the oil fume.

[0014] To facilitate the tightening, winding and loosening of the first strip-like component, the filter driving assembly includes a first frame fixed in the air duct, a first winding shaft and a first steering column assembly, the first winding shaft extends along the width direction of the filter and both ends are rotatably connected to the first frame, in the oil fume flow path, the first winding shaft is located downstream of the filter, the first steering column assembly includes a first steering column shaft parallel to the first winding shaft, and the two ends of the first strip-like component are respectively fixed to the corresponding ends of the first winding shaft and the first steering column shaft, so that the first strip-like component can be tightened and wound on the first winding shaft or loosened from the first winding shaft, thereby driving the first steering column shaft to move.

[0015] To reduce the friction resistance between the first steering column assembly and the filter, the first steering column assembly further includes a first steering column barrel in contact with the filter, the first steering column shaft passes through the first steering column barrel, and the first steering column barrel can rotate relative to the first steering column shaft.

[0016] To facilitate the linkage and transmission of each first winding shaft, the first winding shaft has at least two arranged at intervals along the length direction of the filter screen, the filter screen drive assembly also includes an upper driving mechanism, a first pulley and a first transmission belt, a first pulley is fixed on each first winding shaft, and a first transmission belt is wound between the first pulleys on two adjacent first winding shafts to realize the transmission of the two adjacent first winding shafts, one of the first winding shafts is connected to the upper driving mechanism in transmission, so that it can be driven by the upper driving mechanism to rotate around its own axis.

[0017] To facilitate the tightening, winding and loosening of the second belt-like component, the drive assembly under the filter includes a second frame fixed in the air duct, a second winding shaft and a second steering column assembly. The second winding shaft extends along the width direction of the filter and both ends are rotatably connected to the second frame. On the oil fume flow path, the second winding shaft is located upstream of the filter. The second steering column assembly includes a second steering column shaft parallel to the second winding shaft. The two ends of each second belt-like component are respectively fixed to the corresponding ends of the second winding shaft and the second steering column shaft, so that the second belt-like component can be tightened and wound on the second winding shaft or loosened from the second winding shaft, thereby driving the second steering column shaft to move.

[0018] To reduce the friction resistance between the second steering column assembly and the filter, the second steering column assembly further includes a second steering column barrel in contact with the filter, the second steering column shaft passes through the second steering column barrel, and the second steering column barrel can rotate relative to the second steering column shaft.

[0019] To facilitate the transmission of power to the second winding shaft, the second winding shaft has at least two shafts arranged at intervals along the length direction of the filter and rotate independently. The filter drive assembly also includes a lower driving mechanism, a second pulley, a second transmission belt and a power shaft. A parallel power shaft is arranged at an adjacent position of each second winding shaft, and a second pulley is fixed on each power shaft. A second transmission belt is wound between the second pulleys on the two adjacent power shafts to realize the transmission of the two adjacent power shafts. One of the power shafts is connected in transmission to the lower driving mechanism so that it can be driven by the lower driving mechanism to rotate around its own axis. Each second winding shaft can be connected in transmission to an adjacent power shaft and can rotate around its own axis with the power shaft or be disconnected from the adjacent power shaft.

[0020] To facilitate the independent driving and linkage of the second winding shaft, the filter lower drive assembly also includes a power switching shaft arranged between each second winding shaft and the adjacent power shaft, the power switching shaft is parallel to the second winding shaft, and one end of each power switching shaft is provided with a first transmission gear, and the corresponding ends of each second winding shaft and the power shaft are provided with a second transmission gear, and the power switching shaft can move linearly along its own axis so that the first transmission gear engages or disengages with the second transmission gear.

[0021] To facilitate the movement of the power switching shaft, the second frame is provided with an electromagnet at a corresponding position of the other end of each power switching shaft, so that the power switching shaft can be attracted, and the power switching shaft keeps a tendency to leave the electromagnet.

[0022] 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 extend out of the air duct, and the filter assembly also includes support frames arranged on two opposite sides outside the air duct and a support shaft rotatably supported in the support frame. The parts of the filter extending out of the air duct can be respectively wound on the support shaft and fixed to the support shaft at the ends. The length direction of the filter is the direction extending between the two support frames; the filter assembly also includes a first motion mechanism for driving the support shaft to rotate around its own axis.

[0023] In order to facilitate the support and extrusion of the 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.

[0024] In order to facilitate adaptation to filter screens of different thicknesses, the filter assembly also includes an extrusion amount adjustment assembly for adjusting the degree of extrusion between the extrusion assembly and the filter screen.

[0025] Preferably, the extrusion amount adjustment assembly includes a roller, a roller bracket, a first fixed bracket and an adjusting screw, the first fixed bracket is fixed to the outside of the supporting frame, the adjusting screw passes through the first fixed bracket and is threadedly connected to the first fixed bracket, the roller bracket is arranged at the end of the adjusting screw close to the second roller, the roller is rotatably arranged on the roller bracket, the rotation axis of the roller is parallel to the rotation axis of the second roller, the end of the second roller extends out of the supporting frame, the roller contacts the axis of the second roller, so that the second roller can be pushed close to the first roller as the adjusting screw pushes the second roller, and the roller bracket maintains a tendency to reset in the direction away from the second roller.

[0026] To facilitate cleaning of the filter screen in the support frame, the filter assembly also includes a cleaning device arranged in at least one support frame, the cleaning device includes a swing arm, a swing arm driving mechanism, a nozzle and a swing arm bracket fixedly arranged in the support frame, the swing arm is rotatably arranged on the swing arm bracket and driven to swing by the swing arm driving mechanism, the rotation axis of the swing arm bracket is the length direction of the filter screen, the nozzle is arranged on the swing arm and swings with the swing arm, and the nozzle is connected to a cleaning medium source through the swing arm.

[0027] To facilitate the provision of cleaning medium to the nozzle, the cleaning device also includes a water box and a water pump fixedly arranged in the supporting frame. The water box is used to store the cleaning medium as a cleaning medium source. The water pump is connected to the water box fluid through an inlet pipe. A flow channel is formed in the swing arm, and the water pump is connected to the fluid in the swing arm through an outlet pipe.

[0028] Preferably, in order to facilitate the installation of the water box and avoid splashing of cleaning medium when the nozzle is cleaned, the swing arm is located above the filter, and the cleaning device also includes a mounting plate fixedly arranged in the support frame, the water box is arranged on the mounting plate, the mounting plate is partially protruded upward and a through groove is formed at the protruding position, the through groove connects the space fluid above and below the mounting plate, the position of the through groove corresponds to the nozzle and extends in the width direction of the filter.

[0029] To facilitate immersion and cleaning of the filter in the support frame, the range hood also includes a drainage assembly, which is arranged corresponding to the cleaning device. The drainage assembly includes a moving shaft and a plug. An oil drain hole is opened at the bottom of the support frame. The plug is arranged at the lower end of the moving shaft. The outer diameter of the plug is larger than the oil drain hole and can block the oil drain hole. A thin shaft portion with an outer diameter smaller than the oil drain hole is formed at the lower end of the moving shaft. The plug is located below the thin shaft portion. When the moving shaft moves upward, the plug moves upward from the bottom of the support frame to block the oil drain hole. When the moving shaft moves downward, the plug leaves the oil drain hole and makes the thin shaft portion located at the oil drain hole, thereby opening the oil drain hole.

[0030] In order to facilitate the opening and closing of the oil drainage hole of the support frame to cooperate with the movement of the nozzle, so that the filter screen can be immersed after the entire width is cleaned, the drainage assembly also includes a cam and a second fixed bracket fixed in the support frame, the moving shaft is slidably connected to the second fixed bracket and can move up and down relative to the second fixed bracket, the cam and the swing arm are connected by a synchronous shaft and can swing synchronously, the moving shaft is located below the cam and can be pressed down by the cam and maintain a tendency to move upward.

[0031] Preferably, in order to facilitate the discharge of the oil or oil-water mixture in the support frame into the established oil circuit of the range hood, the range hood also includes an air inlet assembly and a connecting box arranged above the air inlet assembly, the air duct is formed in the connecting box, the filter upper drive assembly and the filter lower drive assembly are arranged in the connecting box, and the support frame is arranged on the left and right sides of the connecting box; the filter assembly also includes an oil guide plate arranged under each support frame, the projection of the oil drain hole on the horizontal plane falls within the projection range of the oil guide plate, the oil guide plate gradually tilts downward from away from the connecting box to close to the connecting box, the end of the oil guide plate abuts against the side wall of the connecting box, and the side wall of the connecting box is provided with an oil leakage hole for guiding the oil from the oil guide plate into the connecting box.

[0032] Preferably, in order to facilitate the discharge of the oil or oil-water mixture in the support frame into the established oil circuit of the range hood, the range hood also includes an air inlet assembly and a connecting box arranged above the air inlet assembly, the air duct is formed in the connecting box, the filter upper drive assembly and the filter lower drive assembly are arranged in the connecting box, and the support frame is arranged on the left and right sides of the connecting box; the bottom of the support frame is provided with an oil drain hole, and the filter assembly also includes an oil guide plate arranged under each support frame, the projection of the oil drain hole on the horizontal plane falls within the projection range of the oil guide plate, the oil guide plate gradually tilts downward from away from the connecting box to close to the connecting box, the end of the oil guide plate abuts against the side wall of the connecting box, and the side wall of the connecting box is provided with an oil leakage hole for guiding the oil from the oil guide plate into the connecting box.

[0033] Preferably, the range hood further comprises an air inlet assembly and a power device for being arranged in the suspended ceiling.

[0034] The technical solution adopted by the present invention to solve the above second technical problem is: a control method of the range hood as described above, the range hood includes an air inlet assembly, characterized in that: the first steering column assembly has three components arranged at intervals on the left and right, the second steering column assembly has two components arranged at intervals on the left and right, the first steering column assembly and the second steering column assembly are arranged alternately, and the first steering column assembly is located in the middle, and the control method comprises the following steps:

[0035] 1) The range hood is started;

[0036] 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;

[0037] 3) Determine the relationship between Np and the preset lower limit value Na, middle limit value Nb and upper limit value Nc, and the filter screen drive component and the filter screen drive component perform corresponding actions according to the determination result:

[0038] 3.1) If Np≤Na, the filter screen drive assembly and the filter screen drive assembly do not move, and the filter screen is placed horizontally;

[0039] 3.2) If Na<Np≤Nb, 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 smoke concentrations. If not established, the filter lower drive assembly is activated, and each second steering column assembly pulls the corresponding part of the filter downward, so that the filter is arranged in a W-shaped manner; if established, it is determined whether the oil smoke concentration is greater on the left or right side, and then the filter lower drive assembly is activated, so that the corresponding second steering column assembly pulls the corresponding part of the filter downward;

[0040] 3.3) If Nb<Np≤Nc, the filter upper drive assembly and the filter lower drive assembly are both started, and each of the first steering column assembly and the second steering column assembly pulls the filter respectively, so that the filter is arranged in a wave shape.

[0041] 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:

[0042] 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 operations of the filter n=0;

[0043] 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;

[0044] 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.

[0045] Preferably, in step 3), if n≤n0, the first motion mechanism reverses, the first roller and the second roller rotate to squeeze out the oil on the filter, the filter upper drive assembly and the filter lower drive assembly are started, causing the filter to vibrate until the filter completes a full cycle, records n=n+1, and ends.

[0046] Preferably, in step 3), if n>n0, the first motion mechanism reverses, the first roller and the second roller rotate to squeeze out the oil on the filter, and the filter is sprayed and cleaned by a nozzle on the side to which it moves until the filter completes a full cycle, and the filter is soaked for a certain time; then the first motion mechanism reverses again, and the filter drive assembly and the filter lower drive assembly are started, causing the filter to shake until the filter completes a full cycle; finally, the first motion mechanism reverses again, and the first roller and the second roller rotate to squeeze out the oil-water mixture on the filter, and at the same time the filter drive assembly and the filter lower drive assembly are started, causing the filter to shake until the filter completes a full cycle, and then the value of n is reset to 0, and the process ends.

[0047] Compared with the prior art, the advantages of the present invention are:

[0048] 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;

[0049] 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;

[0050] 3. It can self-clean according to the contamination of the filter, without the need for users to manually clean the filter;

[0051] 4. The filter cleaning device is equipped with a self-draining function. When the self-cleaning nozzle is not in use, the spray hole contacts the top of the support frame to prevent oil blockage. At this time, the oil can be discharged normally. When the self-cleaning nozzle is used, the oil drainage hole is blocked to soak the filter. When the nozzle is rotated to the top of the support frame, waste water can be discharged. No electronic equipment is required to discharge waste water and waste oil, which realizes the linkage between drainage and cleaning process and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a schematic diagram of a range hood according to an embodiment of the present invention;

[0053] Figure 2 Schematic diagram of a connection box and a filter assembly of a range hood according to an embodiment of the present invention (the front side panel of the connection box is hidden);

[0054] Figure 3 is a schematic diagram of a filter assembly of a range hood according to an embodiment of the present invention;

[0055] Figure 4 for Figure 3 A schematic diagram of a partially hidden filter component;

[0056] Figure 5 for Figure 3 A schematic diagram of a partially hidden filter component;

[0057] Figure 6 for Figure 3 A schematic diagram of a cleaning device for a filter assembly;

[0058] Figure 7 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;

[0059] Figure 8 A schematic diagram of a drainage assembly of a filter assembly of a range hood according to an embodiment of the present invention;

[0060] Fig. 9 A partial cross-sectional view of a filter assembly of a range hood according to an embodiment of the present invention (drainage state);

[0061] Fig.10 for Fig. 9 A partial enlarged schematic diagram of Ⅰ;

[0062] Fig.11 A partial cross-sectional view of a filter assembly of a range hood according to an embodiment of the present invention (in a cleaning state);

[0063] Fig.12 for Fig.11 A partial II enlarged schematic diagram of

[0064] Fig.13 A schematic diagram of a driving assembly on a filter screen of a range hood according to an embodiment of the present invention;

[0065] Fig.14 for Fig.13 A partial III enlarged schematic diagram of

[0066] Fig.15 is a schematic diagram of a driving assembly under the filter of a range hood according to an embodiment of the present invention;

[0067] Fig.16 for Fig.15 A partial enlarged schematic diagram of Ⅳ;

[0068] Fig.17 A partial cross-sectional view of a driving assembly under the filter of a range hood according to an embodiment of the present invention;

[0069] Fig.18 A cross-sectional view of a first steering column assembly of a filter driving assembly of a range hood according to an embodiment of the present invention;

[0070] Fig.19 A schematic diagram of a working state of a range hood according to an embodiment of the present invention;

[0071] Fig. 20 for Fig.19 A schematic diagram of the drive assembly under the filter in a working state;

[0072] Fig.21 A schematic diagram of a working state of a range hood according to an embodiment of the present invention;

[0073] Fig. 22 for Fig.21 A schematic diagram of the drive assembly under the filter in a working state;

[0074] Fig.23 A schematic diagram of a working state of a range hood according to an embodiment of the present invention;

[0075] Fig.24 for Fig.23 A schematic diagram of the drive assembly under the filter in a working state;

[0076] Fig.25 A schematic diagram of a working state of a range hood according to an embodiment of the present invention;

[0077] Fig.26 for Fig.25 A schematic diagram of the drive assembly under the filter in a working state;

[0078] Fig. 27 A schematic diagram of a filter cleaning state of a range hood according to an embodiment of the present invention;

[0079] Fig.28 A schematic diagram of a filter screen of a range hood according to an embodiment of the present invention completing a full cycle of movement;

[0080] Fig.29 This is a flow chart of the control of filter shape change of a range hood according to an embodiment of the present invention;

[0081] Fig.30 This is a flow chart of filter cleaning control for a range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0082] 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.

[0083] 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.

[0084] See also Figure 1 to Figure 3 A range hood includes an air intake assembly 1, a power device 2, a connecting box 3, and a connecting pipe 4 connected between the power device 2 and the connecting box 3. Preferably, the power device 2 is arranged in the ceiling and can be a centrifugal fan. The connecting box 3 is located above the air intake assembly 1. The connecting pipe 4 is a hose, which is hollow inside to form a long air duct. Alternatively, the connecting box 3 and the connecting pipe 4 can also be an integrated rigid pipe, in which an air duct is formed.

[0085] Since the power device 2 is arranged in the ceiling, the ceiling needs to be disassembled when the impeller is maintained, which is very troublesome to clean and maintain. Frequent disassembly of the ceiling gusset plate is prone to deformation and installation gaps. In addition, it is difficult to self-clean the upper end of the ceiling because a water box needs to be connected. If the water box is placed at a lower position where the user can reach it, it is far away from the water pump of the cleaning device (in the ceiling), and the performance requirements of the water pump are very high (large suction head). If the water pump is placed at a low position, the head loss is large, which affects the cleaning effect.

[0086] In order to solve the problem of maintenance-free power device 2, a more feasible way is to install a filter assembly at the middle long air duct position. The filter assembly is partially arranged in the long air duct and partially arranged outside the long air duct. In this embodiment, the filter assembly is arranged at the connection box 3, partially located in the connection box 3, and partially located outside the connection box 3.

[0087] See also Figure 2 to Figure 5Specifically, the filter assembly includes a filter screen 51, a support frame 52 arranged on opposite sides of the connection box 3, a first roller 53, a second roller 54, a support shaft 55, an extrusion amount adjustment assembly 56 and a drainage assembly 57. The filter screen 51 can be made of a porous adsorbable and 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 connection box 3. 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 screen 51 are respectively wound on the support shaft 55, and the first circle of the filter screen 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 and rear direction and is the axis of the support shaft 55 itself), the part of the filter screen 5 located in the connection box 3 can be driven to move left and right, and the part wound on the support shaft 55 continues to be wound or loosened for several circles.

[0088] 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.

[0089] 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, and the oil stains will be discharged on the inner wall surface of the connecting box body 3 or in the support frame 52. The rotation axis of the two rollers is parallel to the support shaft 55.

[0090] The filter assembly also includes a second motion mechanism 60, including a second drive mechanism 601 and a second transmission mechanism 602. In the present embodiment, the second drive mechanism 601 is a motor, and the second transmission mechanism 602 is a gear set. The primary gear of the gear set is arranged on the output shaft of the second drive mechanism 601, 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 601 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.

[0091] See also Figure 4 , Figure 5 and Figure 7 In 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 abutted against 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 solutions, as long as the relative position of the second roller 54 and the filter 51 can be changed to change the degree of extrusion.

[0092] The filter screen 51 can be washed in at least one of the support frames 52. For example, in this embodiment, the filter screen 51 can be washed in the left support frame 52 when the left filter screen is fully retracted (the filter screen 51 in the right support frame 52 is only wound once). Fig. 27, add a cleaning medium, such as hot water or a mixture of water and a cleaning agent. In this embodiment, hot water is used as an example to heat-melt or emulsify the grease on the filter screen 51 so that it is separated from the filter screen 51.

[0093] See also Figure 5 , Figure 6 and Figure 8 To this end, the range hood further includes a cleaning device and a drainage assembly 57, wherein the cleaning device is arranged on the left support frame 52, and includes a water box 611, a water pump 612, a swing arm 613, a swing arm driving mechanism 614, a nozzle 615 and a swing arm bracket 616. The water box 611 and the swing arm bracket 616 are fixedly arranged in the support frame 52, the water box 611 is used as a cleaning medium source, and the cleaning medium is stored therein, the swing arm driving mechanism 614 and the water pump 612 can be arranged on the swing arm bracket 616, and the swing arm driving mechanism 614 is preferably a motor, the swing arm 613 is rotatably connected to the swing arm bracket 616, and the swing arm 613 is transmission-connected to the output end of the swing arm driving mechanism 614, so that the swing arm 613 can be driven to rotate relative to the swing arm bracket 616. In this embodiment, when the support frame 52 is arranged on the left and right sides of the connection box 3, the rotation axis of the swing arm 613 extends in the left and right directions and is perpendicular to the support shaft 55 of the filter screen 51. The nozzle 615 is disposed on the swing arm 613 , such as a hole opened on the end of the swing arm 613 away from the end connected to the swing arm driving mechanism 614 .

[0094] The water pump 612 is in fluid communication with the water box 611 through the water inlet pipe 619. A flow channel is formed in the swing arm 613. The water pump 612 is in fluid communication with the swing arm 613 through the water outlet pipe 620, and is thereby in fluid communication with the nozzle 615. The swing arm 613 is located above the filter screen 51. Therefore, when the swing arm 613 rotates, the nozzle 615 can perform all-round cleaning of the filter screen 51 in the width direction (front and rear direction).

[0095] The cleaning device also includes a mounting plate 618 fixedly arranged in the support frame 52. The mounting plate 618 extends in the lateral direction, preferably in the horizontal direction. The shape and size of the mounting plate 618 are adapted to the cross section of the support frame 52, so that the periphery of the mounting plate 618 is fixed to the support frame 52, and the water box 611 mentioned above can be arranged on the mounting plate 618. The mounting plate 618 partially protrudes upward and forms a through groove 617 at the protruding position. The through groove 617 connects the space above and below the mounting plate 618. The position of the through groove 617 corresponds to the nozzle 615 and extends in the front-to-back direction. The cleaning medium sprayed by the nozzle 615 can reach the surface of the filter screen 51 through the through groove 617, thereby preventing the occurrence of water droplets splashing when the nozzle 615 washes the filter screen 51.

[0096] The drainage assembly 57 is arranged on the left support frame 52 (when the cleaning device is arranged in the support frames 52 on both sides, the drainage assembly 57 is arranged on both support frames 52). The drainage assembly 57 includes a second fixed bracket 571, a cam 572, a follower 573, a moving shaft 574, a second elastic member 575, a first retaining ring 576 and a plug 577. The cam 572 and the swing arm 613 are connected by a synchronous shaft 578 so that they can swing synchronously (the axis of rotation also extends in the left and right directions). The second fixed bracket 571 is fixed in the support frame 52, and the moving shaft 574 extends in the up and down directions and is slidably connected to the second fixed bracket 571 so that it can move up and down. The follower 573 is arranged at the top of the moving shaft 574 for cooperating with the cam 572. In this embodiment, the follower 573 is a main body perpendicular to the moving shaft 574. Alternatively, the cam 572 can also be directly matched with the moving shaft 574. The lower end of the moving shaft 574 forms a thin shaft portion 5741, whose outer diameter is smaller than the portion of the moving shaft 574 located above the thin shaft portion 5741. The second elastic member 575 is preferably a spring, which is sleeved on the outer periphery of the moving shaft 574 near the lower end. The first retaining ring 576 is arranged on the moving shaft 574, so that the two ends of the second elastic member 575 are respectively in contact with the first retaining ring 576 and the bottom surface of the support frame 52 to maintain the upward movement of the moving shaft 574. The plug 577 is arranged at the lower end of the moving shaft 574, which can be made of soft materials, such as rubber, silicone, etc., and preferably presents a tapered shape with an outer diameter gradually increasing from top to bottom.

[0097] An oil drain hole 521 is provided at the bottom of each support frame 52, and the filter assembly further includes an oil guide plate 59 disposed below each support frame 52. The projection of the oil drain hole 521 on the horizontal plane falls within the projection range of the oil guide plate 59, so that the oil or water dripping from the oil drain hole 521 can fall onto the oil guide plate 59. The oil guide plate 59 gradually tilts downward from away from the connection box 3 to close to the connection box 3. The end of the oil guide plate 59 abuts against the side wall of the connection box 3, and an oil leakage hole 31 is provided on the side wall of the connection box 3, so that the grease, water, etc. flowing down from the oil guide plate 59 enters the interior of the connection box 3 through the oil leakage hole 31. The position of the oil leakage hole 31 is not lower than the end of the oil guide plate 59 abutting against the connection box 3.

[0098] When in non-cleaning state, see Fig. 9 and Fig.10The swing arm 613 is facing upward, so that the nozzle 615 is facing upward and in contact with the top of the support frame 52, which can prevent oil pollution and blockage. At this time, the tip of the cam 572 is downward, and the moving shaft 574 is downward as a whole. The thin shaft portion 5741 at its lower end is located at the oil drain hole 521 of the support frame 52, and the plug 577 is located below the oil drain hole 521. This is conducive to oil dripping when the filter screen 51 is stationary and prevents oil from accumulating in the support frame 52.

[0099] When activating the cleaning device, see Fig.11 and Fig.12 , the water pump 612 pumps the cleaning medium in the water box 611 to the swing arm 613, and the swing arm 613 is driven to rotate by the swing arm driving mechanism 614 and is no longer in a state of keeping the nozzle 615 upward. The swing arm 613 rotates downward so that the nozzle 615 moves downward, thereby spraying the cleaning medium to the filter screen 51 through the through groove 617. During cleaning, the cylindrical surface of the cam 572 will contact the follower 573. Driven by the reset force of the second elastic member 575, the moving shaft 574 will move upward, causing the plug 577 to form a seal with the oil drain hole 521 blocked at the bottom of the support frame 52, so that the water during the cleaning process will not be discharged immediately, and the filter screen 51 can be soaked to a certain extent, which is conducive to improving the cleanliness rate of the filter screen. The swing arm 613 can rotate from front to back first, and then swing from back to front, so that the nozzle 615 can clean the filter screen 51 over the entire width range. After cleaning, the swing arm 613 returns to its original position, the nozzle 615 is in an upward position, the plug 577 no longer blocks the oil drain hole 521 at the bottom of the support frame 52, and the sewage is discharged into the connecting box 3 through the oil guide plate 59 and finally flows into the oil cup (not shown).

[0100] See also Figure 2 , Figure 13 to Figure 18, a filter upper drive assembly 62 and a filter lower drive assembly 63 are arranged in the space where the filter 51 in the connection box 3 is located. The filter drive assembly 62 includes an upper drive mechanism 621, a first pulley 622, a first transmission belt 623, a first winding shaft 624 and a first steering column assembly 625. The upper drive mechanism 621 is arranged on a first frame 626, and the first frame 626 is fixed at a position above the filter 51 in the connection box 3. The first winding shaft 624 is rotatably connected to the first frame 626, and the first winding shaft 624 extends along the width direction of the filter 51, that is, in this embodiment, it extends along the front-back direction. Preferably, there are three first winding shafts 624 arranged at intervals on the left and right, and first pulleys 622 are respectively provided on the front and rear ends of each first winding shaft 624 and the output end of the upper driving mechanism 621, one first pulley 622 is provided on the first winding shaft 624 on the left, and two first pulleys 622 are provided on the first winding shafts 624 in the middle and on the right, the first winding shaft 624 and the first pulleys 622 are fixed, and the first pulleys 622 on the two adjacent first winding shafts 624 are wound with a first transmission belt 623, and the first pulley 622 on each first winding shaft 624 rotates synchronously with the corresponding first winding shaft 624. One of the first winding shafts 624 is connected to the upper driving mechanism 621 in transmission connection, so that it can be driven by the upper driving mechanism 621 to rotate around its own axis. In this embodiment, the upper driving mechanism 621 is a motor, and the transmission connection is achieved through one of the first pulleys 622 arranged at one end of the first winding shaft 624 on the right side, the first pulley 622 mounted on the output end of the upper driving mechanism 621, and the first transmission belt 623 wound around the two first pulleys 622, so that the first winding shaft 624 on the right side can drive the first winding shaft 624 in the middle to rotate, and the first winding shaft 624 in the middle can drive the first winding shaft 624 on the left side to rotate.

[0101] The front and rear ends of each first winding shaft 624 can also be respectively sleeved with a first winding wheel 627, and the first winding wheel 627 and the corresponding first winding shaft 624 rotate synchronously. The first steering column assembly 625 is arranged at the bottom of the filter 51 (the surface of the filter 51 facing the oil smoke) and contacts the filter 51, and includes a first steering column barrel 6251 and a first steering column shaft 6252 passing through the first steering column barrel 6251. The first steering column barrel 6251, the first steering column shaft 6252 and the first winding shaft 624 are parallel and also extend in the front-to-back direction. The first steering column barrel 6251 can rotate relative to the first steering column shaft 6252. A flexible first belt-like component 628 is arranged between each first winding wheel 627 and the corresponding end of the first steering column shaft 6252, which may be a rope, a line, an elastic belt, etc. The two ends of the first belt-like component 628 are respectively fixed to the first winding wheel 627 and the end of the first steering column shaft 6252 passing through the first steering column barrel 6251, and the two first belt-like components 628 are respectively located at the front and rear sides of the filter 51. Therefore, when the first winding shaft 624 rotates, it will cause the winding and loosening of the first belt-like component 628, thereby realizing the up and down movement of the first steering column assembly 625. When moving downward, the first belt-like component 628 is loosened and can be realized due to the gravity of the first steering column barrel 6251 (at this time, the filter 51 can only restore the straight state under its own gravity, and the downward movement needs to be realized by the filter lower drive assembly 63), and when moving upward, the first belt-like component 628 is tightened and wound. The upward movement of the first steering column assembly 625 enables the upward movement of the filter screen 51 at the corresponding position of the first steering column assembly 625 , thereby achieving the shape change of the filter screen 51 .

[0102] The driving principle of the filter lower drive assembly 63 is similar to that of the filter upper drive assembly 62, including a lower drive mechanism 631, a second pulley 632, a second transmission belt 633, a second winding shaft 634, a second steering column assembly 635, a power shaft 639 and a power switching shaft 640. The lower drive mechanism 631 is arranged on the second frame 636, and the lower drive mechanism 631 is preferably a motor. The second frame 636 is fixed to a position below the filter 51 in the connection box 3. The above-mentioned second winding shaft 634 is rotatably connected to the second frame 636, and the second winding shaft 634 extends along the width direction of the filter 51, that is, in this embodiment, it extends along the front-to-back direction. Preferably, the second winding shaft 634 has two arranged at intervals on the left and right.

[0103] The two second winding shafts 634 can be driven independently. To this end, a power shaft 639 is arranged at an adjacent position of each second winding shaft 634, and a power switching shaft 640 is arranged between the second winding shaft 634 and the adjacent power shaft 639. The power shaft 639 and the power switching shaft 640 are both rotatably connected to the second frame 636, and are both arranged parallel to the second winding shaft 634 and extend along the front-to-back direction.

[0104] Two second pulleys 632 are respectively sleeved on each power shaft 639 and the output end of the lower driving mechanism 631, and the power shaft 639 and the second pulleys 632 are fixed. A second transmission belt 633 is wound around the second pulleys 632 at the corresponding ends of the adjacent power shafts 639, and one of the power shafts 639 is also transmission-connected with the lower driving mechanism 632 (thereby the power shaft 639 serves as an active power shaft), and can be driven by the lower driving mechanism 631 to rotate around its own axis. In this embodiment, the lower driving mechanism 631 is a motor, and the transmission connection is realized by one of the second pulleys 632 arranged at one end of the power shaft 639 on the right side, the second pulley 632 sleeved on the output end of the lower driving mechanism 631, and the second transmission belt 633 wound around the two second pulleys 632, so that the power shaft 639 on the right side can drive the power shaft 640 on the left side to rotate.

[0105] A third elastic member 6422 and a second retaining ring 6423 are provided at one of the front and rear ends of each power switching shaft 640, and an electromagnet 6421 and a mounting bracket 624 are provided at the corresponding position of the second frame 636. The electromagnet 6421 is arranged in the mounting bracket 624 and both are fixed to the second frame 636. The third elastic member 6422 is preferably a spring, which is sleeved on the outer periphery of the end of the power switching shaft 640, and the second retaining ring 6423 is sleeved on the outer periphery of the power switching shaft 640 near the end. As a result, the two ends of the third elastic member 6422 are respectively in contact with the mounting bracket 624 and the second retaining ring 6422, so as to maintain the tendency of the end of the power switching shaft 640 to leave the electromagnet 6421.

[0106] The other end of each power switching shaft 640 is provided with a first transmission gear 6411, and the corresponding end of each second winding shaft 634 and the power shaft 639 is provided with a second transmission gear 6412. When the electromagnet 6421 is powered on, the power switching shaft 640 is attracted and can be inserted into the mounting bracket 624. At this time, the first transmission gear 6411 and the two adjacent second transmission gears 6412 are disengaged, and the power shaft 639 cannot transmit power to the adjacent second winding shaft 634. When the electromagnet 6421 is powered off, the power switching shaft 640 is separated from the electromagnet 6421 under the reset force of the third elastic member 6422, so that the first transmission gear 6411 can mesh with the two adjacent second transmission gears 6412, and the power shaft 639 can transmit power to the adjacent second winding shaft 634, thereby realizing the independent drive of the two second winding shafts 634. The mounting bracket 624 guides the movement of the power switching shaft 640.

[0107] The front and rear ends of each second winding shaft 634 can also be respectively sleeved with a second winding wheel 637, and the second winding wheel 637 and the corresponding second winding shaft 634 rotate synchronously. The second steering column assembly 635 is arranged on the top of the filter 51 (the surface of the filter 51 facing away from the oil smoke) and contacts the filter 51, and includes a second steering column barrel 6351 and a second steering column shaft 6352 passing through the second steering column barrel 6351. The second steering column barrel 6351, the second steering column shaft 6352 and the second winding shaft 634 are parallel and also extend in the front-to-back direction. The second steering column barrel 6351 can rotate relative to the second steering column shaft 6352. A second belt-like component 638 is provided between the corresponding ends of each second winding wheel 637 and the second steering column shaft 6352, which may be a rope, a line, an elastic belt, etc. The two ends of the second belt-like component 638 are respectively fixed to the ends of the second winding wheel 637 and the second steering column shaft 6352 passing through the second steering column tube 6351, and the two second belt-like components 638 are respectively located at the front and rear sides of the filter 51. The first steering column assembly 525 and the second steering column assembly 535 have the same structure. Therefore, when the second winding shaft 634 rotates, it will cause the winding and loosening of the second belt-like component 638, thereby realizing the up and down movement of the second steering column assembly 635. When moving downward, the second belt-like component 638 tightens and winds to drive the second steering column assembly 635 downward, and when moving upward, the second belt-like component 638 loosens (the filter 51 is driven upward by the filter driving assembly 62). Through the downward movement of the second steering column assembly 635 , the filter screen 51 and the corresponding positions of the second steering column assembly 635 are moved downward, thereby achieving a shape change of the filter screen 51 .

[0108] Since the filter 51 needs to move left and right under the drive of the first motion mechanism 58, the shape change of the filter 51 is driven by the rising and falling of the above-mentioned steering column components to avoid mechanical connection between the filter driving components and the filter 51 to hinder the movement of the filter 51.

[0109] The first steering column assembly 625 of the upper filter driving assembly 62 and the second steering column assembly 635 of the lower filter driving assembly 63 are arranged in an alternating manner, that is, the second steering column assembly 635 is adjacent to each first steering column assembly 625 on both sides, and the first steering column assembly 625 is adjacent to each second steering column assembly 635 on both sides, and there is no adjacent steering column assembly on the left and right sides. In this embodiment, the first steering column assembly 625 is located in the middle, and the second steering column assembly 635 is on both sides, and the first steering column assembly 625 is on both sides outside. The number of the first steering column assembly 625 and the second steering column assembly 635 can be selected as needed. In addition, the first steering column assembly 625 can also be driven independently, and the second steering column assembly 635 can also be driven in a linkage manner.

[0110] Since the filter 51 is made of soft material, the lower drive mechanism 631 can be controlled to move in an alternating forward and reverse manner, so that the steering column assemblies of the filter drive assembly 62 and the lower drive assembly 63 can move up and down slightly, which can cause the filter 51 to shake and remove the liquid oil stains on the filter 51 to a certain extent.

[0111] Through the movement of each steering column assembly, the shape of the filter 51 can be changed, the contact area with the oil fume can be increased, and the air inlet area is increased, thereby reducing the wind resistance (the larger the contact area, the less oil fume passing through per unit area when the amount of oil fume is the same). The wind resistance is small, but the increase in contact area means that the filter 51 is exposed to the oil fume environment for a longer time, which will shorten the cleaning and maintenance cycle of the filter 51, so the shape of the filter 51 should be reasonably adjusted according to the oil fume concentration.

[0112] The relationship between filter shape and oil fume concentration also involves control methods. For details, see Fig.29 , including the following steps:

[0113] 1) The range hood is started;

[0114] 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;

[0115] 3) Determine the relationship between Np and the preset lower limit value Na, middle limit value Nb and upper limit value Nc, and the filter screen drive component 62 and the filter screen lower drive component 63 perform corresponding actions according to the determination result:

[0116] 3.1) If Np≤Na, the filter upper drive assembly 62 and the filter lower drive assembly 63 do not move, that is, the steering column assemblies do not move, and the filter 51 is placed horizontally, see Figure 2 ;

[0117] 3.2) If Na<Np≤Nb, 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 smoke concentrations, such as 10%. If it is not established, the filter lower drive assembly 63 is started, and each power shaft 639 transmits the power of the lower drive mechanism 631 to the adjacent second winding shaft 634, pulling the corresponding part of the filter 51 downward, so that the filter 51 is arranged in a W shape, such as Fig.23 and Fig.24If it is established, it is determined whether the oil smoke concentration is greater on the left or right side. If the judgment result is that the oil smoke concentration is greater on the left side, the left second steering column assembly 635 of the filter lower drive assembly 63 moves downward, and the electromagnet 6421 on the right power switching shaft 640 is energized, so that the power shaft 639 cannot transmit power to the corresponding second winding shaft 634, and the left side of the filter 51 is V-shaped and the right side is placed horizontally, as shown in Figures 19 and Fig. 20 If the concentration on the right side is large, the second steering column assembly 635 on the right side of the filter lower drive assembly 63 moves downward, and the electromagnet 6421 on the left side of the power switching shaft 640 is energized, so that the power shaft 639 cannot transmit power to the corresponding second winding shaft 634, and the right side of the filter 51 is V-shaped and the left side is placed horizontally, as shown. Fig.21 and Fig. 22 As shown; the contact area with the oil smoke is further increased, the wind resistance is reduced, and when the difference in oil smoke concentration exceeds a preset threshold, the contact area on the side with a larger concentration is larger and the wind resistance is lower;

[0118] 3.3) If Nb<Np≤Nc, the filter screen drive assembly 62 and the filter screen lower drive assembly 63 are both started, and the two electromagnets 6421 are not energized, and the filter screen 51 is arranged in a wave shape, such as Fig.25 and Fig.26 shown.

[0119] 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, preferably, the first movement mechanism 58 and the second drive mechanism 60 on one side should be started to increase the length of the filter 51 located in the connection box 3, so that the filter 51 has enough length in the connection box 3 to support the above movement.

[0120] 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 to the right side, from the left side to the right side, and vice versa) and the difference between the upper and lower positions of the filter 51 when it is working. For details, see Fig.30 , including the following steps:

[0121] 1) The filter 51 is in the initial state. The default initial state is that there is a rolled filter 51 on the left side and only one circle is wound on the support shaft 55 on the right side, that is, the filter 51 is in the left position. The number of full cycle operations of the filter 51 is n=0. Fig. 27 ;

[0122] 2) The range hood starts to operate, and detects whether the air volume attenuation at the upper and lower positions of the filter 51 reaches a preset threshold value Vf. If not, the filter 51 continues to stay at the original position without moving; if it reaches the preset threshold value Vf, 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; the air volume can be detected by a common wind speed sensor; at the same time, the second motion mechanism 60 is started;

[0123] 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. Fig.28 , 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:

[0124] 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, the first motion mechanism 58 is reversed (opposite to step 2), so that the filter 51 moves from right to left, and the filter drive assembly 62 and the filter lower drive assembly 63 are started, such as each movement of a reference spacing (the distance set in the air duct width direction) so that the filter 51 is shaken, and runs for a certain time, such as 2 to 3 minutes, until the filter 51 completes the movement from right to left, and records n=n+1, and ends; in this process, the squeezing assemblies on the left and right sides, especially the first roller 53 and the second roller 54 on the right side squeeze oil;

[0125] 3.2) If n>n0, the user is reminded to add water to the water box 611 in the left support frame 52, and then the first motion mechanism 58 is reversed (opposite to step 2), so that the filter 51 moves from right to left, and 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, and when the part of the filter 51 located outside the left support frame 52 begins to pass through the cleaning area (i.e., the spraying range of the nozzle 615), the swing arm drive mechanism 614 and the water pump 612 are started, and the nozzle 615 swings to clean the filter 51;

[0126] After the filter 51 completes a full cycle of operation from right to left, it stops waiting and soaks the filter 51 for a certain time, such as 8 to 10 minutes. The first motion mechanism 58 reverses again to drive the filter 51 to move from left to right. The filter upper drive assembly 62 and the filter lower drive assembly 63 are started. For example, the filter 51 vibrates every time it moves a reference spacing (a distance set in the width direction of the air duct). The filter 51 runs for a certain time, such as 2 to 3 minutes, until the filter 51 completes the operation from left to right.

[0127] Finally, the first motion mechanism 58 is reversed again to make the filter 61 move from right to left, and the first roller 53 and the second roller 54 squeeze the oil-water mixture, and the filter upper drive component 62 and the filter lower drive component 63 are started. For each movement of a reference spacing (the distance set in the direction of the air duct width), the filter 51 is caused to shake, and the filter 51 shakes the water until the filter 51 is completely moved to the left and returns to the initial state, and then the value of n is reset to 0, and the process ends.

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 an upper filter driving component (62) and a lower filter driving component (63); The filter screen driving assembly (62) comprises a first steering column assembly (625) and a flexible first belt-shaped component (628); the first steering column assembly (625) is in contact with the surface of the filter screen (51) facing the oil smoke; the first belt-shaped component (628) is connected to the first steering column assembly (625); the first steering column assembly (625) is driven to move by tightening and loosening the first belt-shaped component (628); The filter lower driving assembly (63) comprises a second steering column assembly (635) and a flexible second belt-shaped component (638); the second steering column assembly (635) is in contact with a surface of the filter (51) facing away from the oil smoke; the second belt-shaped component (638) is connected to the second steering column assembly (635); the second steering column assembly (635) is driven to move by tightening and loosening the second belt-shaped component (638); Thus, the filter screen upper driving component (62) can drive the corresponding part of the filter screen (51) to move along the oil fume flow direction, and the filter screen lower driving component (63) can drive the corresponding part of the filter screen (51) to move along the opposite direction of the oil fume flow, thereby changing the shape of the filter screen (51) and further changing the contact area with the oil fume; The filter driving assembly (62) comprises a first frame (626) fixed in the air duct, a first winding shaft (624) and a first steering column assembly (625); the first winding shaft (624) extends along the width direction of the filter (51) and its two ends are respectively rotatably connected to the first frame (626); on the oil smoke flow path, the first winding shaft (624) is located downstream of the filter (51); the first steering column assembly (625) comprises a first steering column shaft (6252) parallel to the first winding shaft (624); the two ends of the first belt-shaped component (628) are respectively fixed to the corresponding ends of the first winding shaft (624) and the first steering column shaft (6252), so that the first belt-shaped component (628) can be tightened and wound on the first winding shaft (624) or loosened from the first winding shaft (624), thereby driving the first steering column shaft (6252) to move; The filter lower driving assembly (63) comprises a second frame (636) fixed in the air duct, a second winding shaft (634) and a second steering column assembly (635), wherein the second winding shaft (634) extends along the width direction of the filter (51) and the two ends are respectively rotatably connected to the second frame (636), and on the oil smoke flow path, the second winding shaft (634) is located upstream of the filter (51), and the second steering column assembly (635) comprises a second steering column shaft (6352) parallel to the second winding shaft (634), and the two ends of each second belt-shaped component (638) are respectively fixed to the corresponding ends of the second winding shaft (634) and the second steering column shaft (6352), so that the second belt-shaped component (638) can be tightened and wound on the second winding shaft (634) or loosened from the second winding shaft (634), thereby driving the second steering column shaft (6352) to move.

2. The range hood according to claim 1, characterized in that: The first steering column assembly (625) further includes a first steering column barrel (6251) in contact with the filter screen (51), the first steering column shaft (6252) passing through the first steering column barrel (6251), and the first steering column barrel (6251) can rotate relative to the first steering column shaft (6252).

3. The range hood according to claim 1, characterized in that: The first winding shaft (624) has at least two of them arranged at intervals along the length direction of the filter screen (51). The filter screen drive assembly (62) further comprises an upper drive mechanism (621), a first pulley (622) and a first transmission belt (623). A first pulley (622) is fixed on each first winding shaft (624). A first transmission belt (623) is wound between the first pulleys (622) on two adjacent first winding shafts (624) to achieve transmission of the two adjacent first winding shafts (624). One of the first winding shafts (624) is in transmission connection with the upper drive mechanism (621), so that it can be driven by the upper drive mechanism (621) to rotate around its own axis.

4. The range hood according to claim 1, characterized in that: The second steering column assembly (635) also includes a second steering column barrel (6351) in contact with the filter (51), the second steering column shaft (6352) passes through the second steering column barrel (6351), and the second steering column barrel (6351) can rotate relative to the second steering column shaft (6352).

5. The range hood according to claim 4, characterized in that: The second winding shaft (634) has at least two shafts that are spaced apart along the length direction of the filter screen (51) and rotate independently. The filter screen drive assembly (62) further comprises a lower drive mechanism (631), a second pulley (632), a second transmission belt (633) and a power shaft (639). A parallel power shaft (639) is arranged at an adjacent position of each second winding shaft (634). A second pulley (632) is fixed on each power shaft (639). Two adjacent power shafts (639) ) is wound around a second pulley (632) on the upper and lower parts of the power shaft (639), thereby realizing the transmission of two adjacent power shafts (639), wherein one power shaft (639) is transmission-connected to the lower driving mechanism (631), thereby being driven by the lower driving mechanism (631) to rotate around its own axis, and each second winding shaft (634) can be transmission-connected to the adjacent power shaft (639) and can rotate around its own axis along with the power shaft (639) or be disconnected from the adjacent power shaft (639).

6. The range hood according to claim 5, characterized in that: The filter lower drive assembly (63) further comprises a power switching shaft (640) arranged between each second winding shaft (634) and an adjacent power shaft (639); the power switching shaft (640) is parallel to the second winding shaft (634); one end of each power switching shaft (640) is provided with a first transmission gear (6411); and the corresponding ends of each second winding shaft (634) and the power shaft (639) are provided with a second transmission gear (6412); the power switching shaft (640) can move linearly along its own axis, so that the first transmission gear (6411) is engaged with or disengaged from the second transmission gear (6412).

7. The range hood according to claim 6, characterized in that: The second frame (636) is provided with an electromagnet (6421) at a corresponding position of the other end of each power switching shaft (640), so that the power switching shaft (640) can be attracted, and the power switching shaft (640) maintains a tendency to leave the electromagnet (6421).

8. The range hood according to any one of claims 1 to 7, characterized in that: The two ends of the filter (51) extend out of the air duct, and the filter assembly further comprises support frames (52) arranged on two opposite sides outside the air duct and a support shaft (55) rotatably supported in the support frame (52). The parts of the filter (51) extending out of the air duct can be respectively wound on the support shaft (55) and fixed to the support shaft (55) at the ends. The length direction of the filter (51) is the direction extending between the two support frames (52); the filter assembly further comprises a first motion mechanism (58) for driving the support shaft (55) to rotate around its own axis.

9. The range hood according to claim 8, 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).

10. The range hood according to claim 9, characterized in that: The filter assembly further comprises an extrusion amount adjustment assembly (56) for adjusting the degree of extrusion between the extrusion assembly and the filter screen (51).

11. The range hood according to claim 10, characterized in that: The extrusion amount adjustment component (56) comprises a roller (561), a roller bracket (562), a first fixed bracket (564) and an adjustment screw (565), wherein 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) and is threadedly connected to the first fixed bracket (564), the roller bracket (562) is arranged at the end of the adjustment screw (565) close to the second roller (54), and the roller (561) is rotatably arranged on a roller bracket (562), 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 supporting frame (52), the roller (561) is in contact with the axis of the second roller (54), so that the second roller (54) can be pushed closer to the first roller (53) along with the adjusting screw (565), and the roller bracket (562) maintains a tendency to reset in a direction away from the second roller (54).

12. The range hood according to claim 8, characterized in that: The filter assembly further comprises a cleaning device arranged in at least one supporting frame (52), the cleaning device comprising a swing arm (613), a swing arm driving mechanism (614), a nozzle (615) and a swing arm bracket (616) fixedly arranged in the supporting frame (52); the swing arm (613) is rotatably arranged on the swing arm bracket (616) and driven to swing by the swing arm driving mechanism (614); the rotation axis of the swing arm bracket (616) is the length direction of the filter screen (51); the nozzle (615) is arranged on the swing arm (613) and swings with the swing arm (613); and the nozzle (615) is connected to a cleaning medium source through the swing arm (613).

13. The range hood according to claim 12, characterized in that: The cleaning device also includes a water box (611) and a water pump (612) fixedly arranged in the support frame (52); the water box (611) is used to store cleaning medium as a cleaning medium source; the water pump (612) is fluidically connected to the water box (611) via a water inlet pipe (619); a flow channel is formed in the swing arm (613); the water pump (612) is fluidically connected to the swing arm (613) via a water outlet pipe (620).

14. The range hood according to claim 13, characterized in that: The swing arm (613) is located above the filter (51), and the cleaning device also includes a mounting plate (618) fixedly arranged in the support frame (52). The water box (611) is arranged on the mounting plate (618), and the mounting plate (618) partially protrudes upward and forms a through groove (617) at the protruding position. The through groove (617) connects the space fluid above and below the mounting plate (618), and the position of the through groove (617) corresponds to the nozzle (615) and extends in the width direction of the filter (51).

15. The range hood according to claim 12, characterized in that: The range hood further comprises a drainage assembly (57), the drainage assembly (57) being arranged corresponding to the cleaning device, the drainage assembly (57) comprising a moving shaft (574) and a plug (577), an oil drain hole (521) being provided at the bottom of the supporting frame (52), the plug (577) being arranged at the lower end of the moving shaft (574), the outer diameter of the plug (577) being larger than the oil drain hole (521) and being able to block the oil drain hole (521), and the lower end of the moving shaft (574) being formed with The thin shaft portion (5741) has an outer diameter smaller than that of the oil drain hole (521), and the plug (577) is located below the thin shaft portion (5741). When the moving shaft (574) moves upward, the plug (577) moves upward from the bottom of the support frame (52) to block the oil drain hole (521). When the moving shaft (574) moves downward, the plug (577) leaves the oil drain hole (521) and makes the thin shaft portion (5741) located at the oil drain hole (521), thereby opening the oil drain hole (521).

16. The range hood according to claim 15, characterized in that: The drainage assembly (57) further comprises a cam (572) and a second fixed bracket (571) fixedly arranged in the support frame (52); the moving shaft (574) is slidably connected to the second fixed bracket (571) and can move up and down relative to the second fixed bracket (571); the cam (572) and the swing arm (613) are connected via a synchronization shaft (578) and can swing synchronously; the moving shaft (574) is located below the cam (572) and can be pressed down by the cam (572) and maintain a tendency to move upward.

17. The range hood according to claim 15, characterized in that: The range hood further comprises an air inlet assembly (1) and a connecting box (3) arranged above the air inlet assembly (1), the air duct being formed in the connecting box (3), the filter upper drive assembly (62) and the filter lower drive assembly (63) being arranged in the connecting box (3), and the support frame (52) being arranged on the left and right sides of the connecting box (3); the filter assembly further comprises an oil guide plate (59) arranged below each support frame (52), the projection of the oil drain hole (521) on a horizontal plane falling within the projection range of the oil guide plate (59), the oil guide plate (59) gradually tilting downward from a position away from the connecting box (3) to a direction close to the connecting box (3), the end of the oil guide plate (59) abutting against the side wall of the connecting box (3), and an oil leakage hole (31) for guiding the oil dirt of the oil guide plate (59) into the connecting box (3) is provided on the side wall of the connecting box (3).

18. The range hood according to claim 9, characterized in that: The range hood further comprises an air inlet assembly (1) and a connecting box (3) arranged above the air inlet assembly (1); the air duct is formed in the connecting box (3); the filter upper drive assembly (62) and the filter lower drive assembly (63) are arranged in the connecting box (3); the support frame (52) is arranged on the left and right sides of the connecting box (3); the bottom of each support frame (52) is provided with an oil drain hole (521); the filter assembly further comprises a filter arranged on each support frame An oil guide plate (59) is disposed below the frame (52), the projection of the oil drain hole (521) on a horizontal plane falls within the projection range of the oil guide plate (59), the oil guide plate (59) gradually tilts downward from a position away from the connection box (3) to a direction close to the connection box (3), the end of the oil guide plate (59) abuts against a side wall of the connection box (3), and an oil leakage hole (31) is provided on the side wall of the connection box (3) for guiding the oil dirt of the oil guide plate (59) into the connection box (3).

19. The range hood according to any one of claims 1 to 7, characterized in that: The range hood further comprises an air inlet assembly (1) and a power device (2) for being arranged in the suspended ceiling.

20. A control method for a range hood according to any one of claims 5 to 7, wherein the range hood comprises an air inlet assembly (1), characterized in that: The first steering column assemblies (625) have three components spaced apart from each other on the left and right, the second steering column assemblies (635) have two components spaced apart from each other on the left and right, the first steering column assemblies (625) and the second steering column assemblies (635) are arranged alternately, and the first steering column assembly (625) is located in the middle, and the control method comprises the following steps: 1) The range hood is started; 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) Determine the relationship between Np and the preset lower limit value Na, middle limit value Nb and upper limit value Nc, and the filter upper drive component (62) and the filter lower drive component (63) perform corresponding actions according to the determination result: 3.1) If Np≤Na, the filter screen upper drive assembly (62) and the filter screen lower drive assembly (63) do not operate, and the filter screen (51) is placed horizontally; 3.2) If Na<Np≤Nb, it is determined whether |N1-N2|>N0 is established, where N0 is a preset threshold value of the difference between the two oil smoke concentrations. If not established, the filter lower driving assembly (63) is started, and each second steering column assembly (635) pulls the corresponding part of the filter (51) downward, so that the filter (51) is arranged in a W shape. If established, it is determined whether the oil smoke concentration is greater on the left or right side, and then the filter lower driving assembly (63) is started, so that the corresponding second steering column assembly (635) pulls the corresponding part of the filter (51) downward; 3.3) If Nb<Np≤Nc, the filter upper drive assembly (62) and the filter lower drive assembly (63) are both started, and the first steering column assembly (625) and the second steering column assembly (635) respectively pull the filter (51), so that the filter (51) is arranged in a wave shape.

21. A range hood cleaning control method as claimed in claim 12, 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 movement mechanism (58) is started to drive the filter (51) to move in the direction of the support shaft (55) that is only wound once, so that the unused part of the filter (51) is located in the air duct, and 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; 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.

22. The range hood cleaning control method according to claim 21, characterized in that: In step 3), if n≤n0, the first motion mechanism (58) is reversed, the first roller (53) and the second roller (54) are rotated to squeeze out the oil on the filter (51), the filter upper drive assembly (62) and the filter lower drive assembly (63) are started, so that the filter (51) is vibrated until the filter (51) completes a full cycle operation, and n=n+1 is recorded, and the process ends.

23. The range hood cleaning control method according to claim 21, characterized in that: In step 3), if n>n0, the first motion mechanism (58) is reversed, the first roller (53) and the second roller (54) are rotated to squeeze out the oil on the filter (51), and the filter (51) is sprayed and cleaned by the nozzle (615) on the side to which it moves, until the filter (51) completes a full cycle operation, and the filter (51) is soaked for a certain time; then the first motion mechanism (58) is reversed again, the filter drive assembly (62) and the filter lower drive assembly (63) are started, so that the filter (51) is shaken until the filter (51) completes a full cycle operation; finally, the first motion mechanism (58) is reversed again, the first roller (53) and the second roller (54) are rotated to squeeze out the oil-water mixture on the filter (51), and at the same time the filter drive assembly (62) and the filter lower drive assembly (63) are started, so that the filter (51) is shaken until the filter (51) completes a full cycle operation, and then the value of n is reset to 0, and the process ends.

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