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 an adjustment mechanism, wherein the output end of the adjustment mechanism can drive the filter screen and the part corresponding to the output end to move along the oil smoke flow direction or 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 advantage of the present invention is 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 second 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 an adjusting mechanism, the output end of which can drive the filter screen corresponding to the output end to move along the oil fume flow direction or in the opposite direction of the oil fume flow, thereby changing the shape of the filter screen and further changing the contact area with the oil fume.

[0011] Preferably, in order to diversify the adjustment state and adapt to different cooking environments, the adjustment mechanism includes at least two adjustment mechanisms arranged at intervals, and at least two adjustment mechanisms drive the filter to move in opposite directions.

[0012] More preferably, there are three adjusting mechanisms, wherein the direction in which the filter is driven to move by the middle adjusting mechanism is opposite to the direction in which the filter is driven to move by the adjusting mechanisms on both sides.

[0013] In order to facilitate the removal of oil stains on the filter screen, a vibration module for removing oil stains on the filter screen is arranged on the output end of at least one regulating mechanism.

[0014] To facilitate supporting the filter, air ducts are extended from both ends of the filter. The filter assembly also includes a support frame arranged on two opposite sides outside the air duct and a support shaft rotatably supported in the support frame. The 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.

[0015] In order to facilitate the replacement of the filter so that the unused part is in the air duct, the filter assembly also includes a first motion mechanism for driving the support shaft to rotate around its own axis, and the adjustment mechanism is a linear drive module that can push the filter.

[0016] 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 of the filter screen, 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.

[0017] 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.

[0018] Preferably, the filtering assembly also includes a second driving mechanism for driving the first roller to rotate, and 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 with the adjusting screw, and the roller bracket maintains a tendency to reset in the direction away from the second roller.

[0019] In order to reduce the friction resistance between the output end of the adjustment mechanism and the filter, a roller shaft is provided on the output end of at least one adjustment mechanism, and a third roller rotatable around the roller shaft is installed on the roller shaft, and the rotation axis of the third roller is parallel to the support shaft.

[0020] In order to facilitate the immersion and cleaning of the filter screen in the support frame and to discharge the oil and dirt on the squeezed part of the filter screen, the filter assembly also includes a drainage assembly, which includes a blocking rod and a float arranged in the support frame, the float is arranged on the blocking rod, an oil drainage hole is opened at the bottom of the support frame, a plug is arranged at the lower end of the blocking rod, the outer diameter of the plug is larger than the oil drainage hole and can block the oil drainage hole, and a thin shaft portion with an outer diameter smaller than the oil drainage hole is formed at the lower end of the blocking rod, the plug is located below the thin shaft portion, and a water injection port is also opened on the support frame

[0021] Preferably, in order to facilitate limiting the movement path of the blocking rod, the drainage assembly also includes a second fixed bracket, the second fixed bracket is fixed in the supporting frame, and a hollow guide column with openings at both ends is fixed to or integrally formed on the second fixed bracket, the blocking rod extends up and down through the guide column and can move up and down relative to the guide column, and the float is arranged on the top of the blocking rod, and the outer diameter of the float is larger than the guide column.

[0022] 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 adjustment mechanism is 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 discharge 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 directing the oil from the oil guide plate into the connecting box.

[0023] Preferably, the range hood further comprises an air inlet assembly and a power device for being arranged in the suspended ceiling.

[0024] The technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood as described above, the range hood includes an air inlet assembly, characterized in that: three adjustment mechanisms are arranged at intervals on the left and right, the middle adjustment mechanism pushes the filter to move downward, and the adjustment mechanisms on both sides push the filter to move upward, and the control method includes the following steps:

[0025] 1) The range hood is started;

[0026] 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;

[0027] 3) Determine the relationship between Np and the preset lower limit Na, middle limit Nb and upper limit Nc, and the adjustment mechanism takes corresponding actions according to the judgment result:

[0028] 3.1) If Np≤Na, the adjustment mechanism does not work and the filter is placed horizontally;

[0029] 3.2) If Na<Np≤Nb, the middle adjustment mechanism is activated and the filter is placed in a V shape;

[0030] 3.3) If Nb<Np≤Nc, it is necessary to determine whether |N1-N2|>N0 is established, where N0 is the preset threshold value of the difference between the two oil fume concentrations. If not established, the three adjustment mechanisms are activated, the left and right adjustment mechanisms push the corresponding parts of the filter upward, and the middle adjustment mechanism pushes the corresponding part of the filter downward, so that the filter is arranged in an M shape; if established, it is determined whether the oil fume concentration is greater on the left or right side, and the adjustment mechanism corresponding to the side with the greater oil fume concentration and the middle adjustment mechanism are activated.

[0031] 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 it comprises the following steps:

[0032] 1) The filter is in the initial state, one of the support shafts has a rolled filter, and the other support shaft has only one circle of winding, and the number of full cycle operation of the filter is recorded as n = 0;

[0033] 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;

[0034] 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.

[0035] Preferably, a vibration module for removing oil stains on the filter is provided on the output end of at least one adjustment mechanism; in step 3), if n≤n0, the first motion mechanism is reversed, the first roller and the second roller rotate to squeeze out the oil on the filter, and the vibration module is started until the filter completes a full cycle operation, and n=n+1 is recorded, and the process ends.

[0036] Preferably, a vibration module for removing oil stains on the filter is provided on the output end of at least one adjustment mechanism; in step 3), if n>n0, the first motion mechanism is reversed, and the first roller and the second roller rotate to squeeze out the oil on the filter until the filter completes a full cycle, and the filter is immersed in the support frame on the side to which it is moved; then the first motion mechanism is reversed again, and the vibration module is started until the filter completes a full cycle; finally, the first motion mechanism is reversed again, and the first roller and the second roller rotate to squeeze out the oil-water mixture on the filter, and the vibration module is started at the same time, until the filter completes a full cycle, and then the value of n is reset to 0, and the process ends.

[0037] Compared with the prior art, the advantages of the present invention are:

[0038] 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;

[0039] 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;

[0040] 3. It can self-clean according to the contamination of the filter, without the need for users to manually clean the filter;

[0041] 4. The filter cleaning device is equipped with a self-draining function, which eliminates the need for electronic equipment to drain waste water and waste oil, and is low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic diagram of a range hood according to an embodiment of the present invention;

[0043] 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);

[0044] Figure 3 is a schematic diagram of a filter assembly of a range hood according to an embodiment of the present invention;

[0045] Figure 4 for Figure 3 A schematic diagram showing a partially hidden portion of the filtering component;

[0046] Figure 5 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;

[0047] Figure 6 A schematic diagram of a drainage assembly of a filter assembly of a range hood according to an embodiment of the present invention;

[0048] Figure 7 A cross-sectional view of a cleaning mechanism of a filter assembly of a range hood according to an embodiment of the present invention;

[0049] Figure 8 is a cross-sectional view of a roller mechanism of a filter assembly of a range hood according to an embodiment of the present invention;

[0050] Fig. 9 A partial cross-sectional view of a filter assembly of a range hood according to an embodiment of the present invention;

[0051] Fig.10 for Fig. 9 A schematic diagram of the partial enlargement of Ⅰ;

[0052] Fig.11 A schematic diagram of a working state of a range hood according to an embodiment of the present invention;

[0053] Fig.12 A schematic diagram of a working state of a range hood according to an embodiment of the present invention;

[0054] Fig.13 A schematic diagram of a working state of a range hood according to an embodiment of the present invention;

[0055] Fig.14 A schematic diagram of a working state of a range hood according to an embodiment of the present invention;

[0056] Fig.15 A schematic diagram of a filter cleaning state of a range hood according to an embodiment of the present invention;

[0057] Fig.16 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;

[0058] Fig.17 This is a flow chart of the control of filter shape change of a range hood according to an embodiment of the present invention;

[0059] Fig.18 This is a flow chart of filter cleaning control for a range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] See also Figure 2 to Figure 4 , Fig. 9 Specifically, 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.

[0066] To facilitate driving the support shaft 55 to rotate, the filter assembly also includes a first motion mechanism 58, including 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.

[0067] The first roller 53 and the second roller 54 constitute an extrusion assembly, and a group of extrusion assemblies are arranged in each support frame 52, wherein the first roller 53 is located above the filter screen 51, and the second roller 54 is located below the filter screen 54, and both are in an extrusion state with the filter screen 51, and 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 grease adheres, it will be squeezed by the two rollers of the extrusion assembly, and a part of the grease on the filter screen 51 will be squeezed off, and the oil 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.

[0068] 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.

[0069] See also Figure 3 to Figure 5In 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, an 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 an elastic member 563, and the 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 elastic member 563 drives the roller bracket 562 to reset downward. In this embodiment, the 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.

[0070] The filter screen 51 can be washed with water in at least one of the support frames 52. A water inlet 522 is provided on the support frame 52, such as at the top. In this embodiment, when washing in the left support frame 52, the filter screen 51 can be completely retracted (the filter screen 51 in the right support frame 52 is only wound once). Fig.15 , 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 melt or emulsify the grease on the filter screen 51 so that it is separated from the filter screen 51. Figure 4 , Figure 6 , Fig. 9 and Fig.10Drainage components 57 are provided in the support frames 52 on the left and right sides (the two drainage components 57 cooperate with the support frames 52 in the same way, and the left side is taken as an example below). The drainage component 57 includes a second fixed bracket 571, a blocking rod 572 and a float 573. The second fixed bracket 571 is fixed in the support frame 52. A hollow guide column 571 with openings at both ends is fixed to or integrally formed on the second fixed bracket 571. The guide column 5711 extends up and down, and the blocking rod 572 extends up and down to pass through the guide column 5711 and can move up and down relative to the guide column 5711. The float 573 is arranged on the top of the blocking rod 572, and the outer diameter of the float 573 is larger than the guide column 5711. An oil drain hole 521 is provided at the bottom of the support frame 52, and a plug 574 is provided at the lower end of the sealing rod 572. The plug 574 can be a soft rubber plug, and its outer diameter is larger than the oil drain hole 521. The lower end of the sealing rod 572 forms a thin shaft portion 5721 with an outer diameter smaller than the oil drain hole 521, and the plug 574 is located below the thin shaft portion 5721.

[0071] The bottom of each support frame 52 is provided with the above-mentioned oil drain hole 521, and the filter assembly also includes an oil guide plate 59 arranged 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 on the oil guide plate 59. The oil guide plate 59 is gradually inclined 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 the side wall of the connection box 3 is provided with an oil leakage hole 31, 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.

[0072] When there is no water, the blocking rod 572 will move downward due to the gravity. When the thin shaft 5721 of the blocking rod 572 is at the oil drain hole 521 of the support frame 52, the float 573 will be stuck on the upper end of the guide column 5711 of the second fixed bracket 571, so that the blocking rod 572 is stationary, so that the oil dirt squeezed or naturally dripping will be discharged from the oil drain hole 521 to the oil guide plate and then discharged. When water washing is needed, water will be added to the support frame 52 through the water injection port 522. As the water level rises rapidly, the float 573 will be driven by buoyancy to move the blocking rod 572 upward, so that the plug 574 at the lower end of the blocking rod 572 moves upward, blocks the oil drain hole 521, and achieves the sealing of clean water. When cleaning is completed, the first movement mechanism 58 will start, driving the filter 51 to move from left to right. After the movement, the filter 51 on the right side is completely retracted (the left side is only wound once for fixing). Fig.16The water level in the left support frame 52 is lowered due to the reduction in the volume of the filter 51, and the buoyancy of the float 573 is also reduced, so the blocking rod 572 moves downward. At this time, the seal at the oil drain hole 521 fails and the water level gradually drops. When the water level is lower than the bottom of the float 573, the blocking rod 572 is in a fully open state. At this time, the water in the left support frame 52 flows through the oil guide plate 59 into the connecting box 3 and then flows to the oil cup (not shown) at the bottom of the air inlet assembly 1 for discharge.

[0073] In the space where the filter 51 of the connection box 3 is located, at least two adjustment mechanisms 61 are arranged at intervals in the left and right directions, which are used to adjust the shape (state) of the filter 51. Each adjustment mechanism 61 is a linear drive module, and its output end can push the corresponding part of the filter 51 to move up and then down. At least one adjustment mechanism 61 drives the corresponding position of the filter 51 to move down, and at least one adjustment structure 61 drives the corresponding position of the filter 51 to move up.

[0074] In this embodiment, there are three adjustment mechanisms 61, which are arranged at intervals in the left-right direction, one of which is located above the filter 51, and the other two are located below the filter 51, and the output end of the adjustment mechanism 61 located above the filter 51 is located in the middle position in the left-right direction of the filter 51. The output ends of the three adjustment mechanisms 61 cooperate with the filter 51 in a pushing form (without mechanical connection), thereby pushing the filter 51 at the corresponding position to move up and down (in the same direction or opposite direction of the oil smoke flow), thereby changing the shape of the filter 51, thereby increasing the contact area with the oil smoke, increasing the air intake area, and reducing the wind resistance (the larger the contact area, the less oil smoke per unit area under the same oil smoke amount, and the smaller the wind resistance). However, increasing the contact area means that the filter 51 exposed to the oil smoke environment is longer, 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 smoke concentration. Preferably, the adjustment mechanism 51 is an electric push rod. Alternatively, other linear drive modules in the prior art may be used, such as a combination of a cylinder, a motor, a gear and a rack.

[0075] See also Figure 2 , Figure 7 and Figure 8, a roller shaft 611 is installed on the output end of the adjustment mechanism 61 on the left and right sides, and a third roller 612 that can rotate around the roller shaft 611 is installed on the roller shaft 611. The roller shaft 611 extends forward and backward, and when the filter 51 moves left and right, it can rotate to reduce the resistance of movement. The rotation axis of the third roller 612 is parallel to the support shaft 55. A hollow protective cover 613 is installed on the output end of the middle adjustment mechanism 61, and a vibration module 614 is arranged in the protective cover 613. The vibration module 614 can be an ultrasonic vibration rod as shown in this embodiment, or an eccentric vibration motor. The tail of the ultrasonic vibration rod has a thread, which can be connected to the protective cover 613 by threading, and only the hexagonal bolt needs to be tightened. The function of the vibration module 614 is to remove the liquid oil stains on the filter 51 by vibration. When the number of adjustment mechanisms 61 changes, it is only necessary to ensure that both the vibration module 614 and the third roller 612 are present, and the number of the vibration module 614 and the third roller 612 can be allocated according to needs.

[0076] The relationship between filter shape and oil fume concentration also involves control methods. For details, see Fig.17 , including the following steps:

[0077] 1) The range hood is started;

[0078] 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;

[0079] 3) Determine the relationship between Np and the preset lower limit value Na, middle limit value Nb and upper limit value Nc, and the adjustment mechanism 61 performs corresponding actions according to the determination result:

[0080] 3.1) If Np≤Na, the adjustment mechanism 61 does not operate and the filter screen 51 is placed horizontally. Figure 2 As shown;

[0081] 3.2) If Na<Np≤Nb, the middle adjustment mechanism 61 is activated, and the filter 61 is placed in a V shape, such as Fig.11 As shown; this can increase the contact area with oil smoke and reduce wind resistance;

[0082] 3.3) If Nb<Np≤Nc, it is necessary to determine whether |N1-N2|>N0 is established, where N0 is a preset threshold value of the difference between the two oil smoke concentrations, such as 10%. If not established, the three adjustment mechanisms 61 are activated, and the left and right adjustment mechanisms 61 push the corresponding parts of the filter 51 upward, and the middle adjustment mechanism 61 pushes the corresponding part of the filter 51 downward, so that the filter 51 is arranged in an M-shaped manner from left to right, first rising, then falling, and then rising again, as shown in FIG. Fig.12 If it is established, it is determined whether the oil fume concentration is greater on the left or right side. If the judgment result is that the oil fume concentration is greater on the left side, the adjustment mechanism 61 on the left and the middle is started, and the filter 51 is arranged in a manner of first rising and then falling from left to right and then horizontally. Fig.13 If the concentration on the right side is large, the adjustment mechanism 61 is activated, and the filter 51 is arranged from left to right in a horizontal manner, then descends and then rises, as shown in FIG. Fig.14 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.

[0083] The above-mentioned preset values ​​can be obtained through experiments. In addition, during the above-mentioned process, the first driving mechanism 58 and the second driving mechanism 60 can be started to prevent the required movement degree of the filter screen 51 from exceeding the deformation range of the filter screen 51 and failing to achieve.

[0084] The cleaning process and operation control method of the filter 51 are mainly judged by the number of full-cycle operations of the filter 51 (from the left side of the filter to the right side to the left side of the filter to the right side of the filter) and the difference between the upper and lower positions of the filter 51 when it is working. In addition, in the following method, the left support frame 52 can be immersed in the cleaning as an example. For details, see Fig.18 , including the following steps:

[0085] 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.15 ;

[0086] 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 and does not move; 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; at the same time, the second motion mechanism 60 is started, and the first roller 53 and the second roller 54 rotate to ensure the normal movement of the filter 51; the air volume can be detected by a commonly used wind speed sensor;

[0087] 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.16 , 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:

[0088] 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. Since the filter 51 moves from left to right and is polluted in the air duct, only the oil squeezing component on the right side can work when it moves from left to right. Then the first motion mechanism 58 is reversed (opposite to step 2), so that the filter 51 moves from right to left. The first roller 53 and the second roller 54 on the left and right sides can both play a role in squeezing oil from the filter 51. The vibration module 614 is started. For example, for each reference spacing (the distance set in the width direction of the air duct) moved, the vibration module 614 runs for 2 to 3 minutes until the filter 51 completes the movement from right to left, and n=n+1 is recorded, and the process ends.

[0089] 3.2) If n>n0, since the filter 51 moves from left to right and is contaminated in the air duct, only the right oil squeezing assembly can work when moving from left to right, and the first motion mechanism 58 is reversed (opposite to step 2), so that the filter 51 Moving from right to left, the first roller 53 and the second roller 54 can both play a role in squeezing oil from the filter 51, and then remind the user to add water to the left support frame 52. After the water soaks the filter 51 for a certain period of time, such as 8 to 10 minutes, the first motion mechanism 58 drives the filter 51 to move to the right, and the vibration module 614 is started. For example, the vibration module 614 runs for 2 to 3 minutes for each reference spacing until the filter 61 completes the movement from left to right. Finally, the first motion mechanism 58 reverses 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 vibration module 614 is started. For example, the vibration module 614 runs for 1 minute for each reference spacing until the filter 51 completely moves 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 adjusting mechanism (61), wherein the output end of the adjusting mechanism (61) can drive the portion of the filter (51) corresponding to the output end to move along the direction of oil smoke flow or in the opposite direction of oil smoke flow, thereby changing the shape of the filter (51) and thus changing the contact area with the oil smoke; The adjusting mechanisms (61) include at least two adjusting mechanisms (61) arranged at intervals, and at least two adjusting mechanisms (61) drive the filter screen (51) to move in opposite directions; The two ends of the filter (51) extend out of the air duct, the filter assembly further comprises a support frame (52) arranged on two opposite sides outside the air duct and a support shaft (55) rotatably supported in the support frame (52), and the portion 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 end; The filter assembly further comprises a first motion mechanism (58) for driving the support shaft (55) to rotate around its own axis, and the adjustment mechanism (61) is a linear drive module capable of pushing the filter screen (51); The filter assembly further comprises an extrusion assembly rotatably supported in the 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), 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); 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). The filter assembly further comprises a second driving mechanism (60) for driving the first roller (53) to rotate. The extrusion amount adjustment assembly (56) comprises a roller (561), a roller bracket (562), 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) and is threadedly connected to the first fixed bracket (564). The wheel bracket (562) is arranged at the end of the adjusting screw (565) close to the second roller (54), the roller (561) is rotatably arranged on the 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 close 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).

2. The range hood according to claim 1, characterized in that: There are three adjusting mechanisms (61), wherein the direction in which the filter screen (51) is driven to move by the middle adjusting mechanism (61) is opposite to the direction in which the filter screen (51) is driven to move by the adjusting mechanisms (61) on both sides.

3. The range hood according to claim 1 or 2, characterized in that: A vibration module (614) for removing oil stains on the filter screen (51) is provided at the output end of at least one adjustment mechanism (61).

4. The range hood according to claim 1 or 2, characterized in that: A roller shaft (611) is provided at the output end of at least one adjusting mechanism (61), and a third roller (612) is mounted on the roller shaft (611) and can rotate around the roller shaft (611), and the rotation axis of the third roller (612) is parallel to the support shaft (55).

5. The range hood according to claim 1 or 2, characterized in that: The filter assembly also includes a drainage assembly (57), the drainage assembly (57) including a blocking rod (572) and a float (573) arranged in a support frame (52), the float (573) being arranged on the blocking rod (572), an oil drain hole (521) being provided at the bottom of the support frame (52), a plug (574) being provided at the lower end of the blocking rod (572), the plug (574) having an outer diameter larger than the oil drain hole (521) and being capable of blocking the oil drain hole (521), a thin shaft portion (5721) having an outer diameter smaller than the oil drain hole (521) being formed at the lower end of the blocking rod (572), the plug (574) being located below the thin shaft portion (5721), and a water injection port (522) being also provided on the support frame (52).

6. The range hood according to claim 5, characterized in that: The drainage assembly (57) also includes a second fixed bracket (571), which is fixed in the support frame (52); a hollow guide column (5711) with openings at both ends is fixed to or integrally formed on the second fixed bracket (571); the blocking rod (572) extends up and down through the guide column (5711) and can move up and down relative to the guide column (5711); the float (573) is arranged on the top of the blocking rod (572); and the outer diameter of the float (573) is larger than the guide column (5711).

7. The range hood according to claim 5, 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 regulating mechanism (61) being arranged in the connecting box (3), and the supporting frame (52) being arranged on the left and right sides of the connecting box (3); the filtering assembly further comprises an oil guide plate (59) arranged below each supporting 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).

8. The range hood according to claim 1 or 2, 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.

9. A control method for a range hood according to claim 2, wherein the range hood comprises an air inlet assembly (1), characterized in that: The three adjustment mechanisms (61) are arranged at intervals on the left and right, the middle adjustment mechanism (61) pushes the filter screen (51) to move downward, and the adjustment mechanisms (61) on both sides push the filter screen (51) to move upward. 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 is recorded as N1, and the oil smoke concentration value on the right 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, intermediate limit value Nb and upper limit value Nc, and the adjustment mechanism (61) performs corresponding actions according to the determination result: 3.1) If Np≤Na, the regulating mechanism (61) does not operate and the filter (51) is placed horizontally; 3.2) If Na<Np≤Nb, the middle adjustment mechanism (61) is activated and the filter (51) is placed in a V shape; 3.3) If Nb<Np≤Nc, it is determined whether |N1-N2|>N0 is established, where N0 is a preset threshold value of the difference between the two oil fume concentrations. If not established, the three adjustment mechanisms (61) are activated, the left and right adjustment mechanisms (61) push the corresponding parts of the filter (51) upward, and the middle adjustment mechanism (61) pushes the corresponding part of the filter (51) downward, so that the filter (51) is arranged in an M shape. If established, it is determined whether the oil fume concentration is greater on the left or right side, and the adjustment mechanism (61) corresponding to the side with greater oil fume concentration and the middle adjustment mechanism (61) are activated.

10. A range hood cleaning control method as claimed in claim 1, characterized in that: The steps include: 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.

11. The range hood cleaning control method according to claim 10, characterized in that: A vibration module (614) for removing oil stains on the filter (51) is provided at the output end of at least one adjustment mechanism (61); 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 vibration module (614) is started until the filter (51) completes a full cycle operation, and n=n+1 is recorded, and the process ends.

12. The range hood cleaning control method according to claim 10, characterized in that: A vibration module (614) for removing oil stains on the filter (51) is provided at the output end of at least one adjustment mechanism (61); 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), until the filter (51) completes a full cycle operation, and the filter (51) is immersed in the support frame (52) on the side to which it moves; then the first motion mechanism (58) is reversed again, and the vibration module (614) is started, 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 the vibration module (614) is started at the same time, 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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