Range hood and control method thereof

Abstract

The present invention discloses a range hood and a control method thereof, comprising a smoke collecting hood, a fan frame arranged above the smoke collecting hood and a fan system arranged in the fan frame, the smoke collecting hood is provided with an air inlet, a smoke guide plate assembly is arranged below the air inlet, and the smoke guide plate assembly includes a main smoke plate located in the middle; it is characterized in that: a dynamic filter is arranged in the fan frame below the fan system, and the dynamic filter can rotate around an axis extending front and rear so as to face a left channel or a right channel in the fan frame; the smoke guide plate assembly also includes a first auxiliary smoke guide plate located on the left side of the main smoke plate and a second auxiliary smoke guide plate located on the right side of the main smoke plate, and the first auxiliary smoke guide plate and the second auxiliary smoke guide plate can both rotate around the axis extending front and rear.

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] Usually, range hoods include top-suction type and side-suction type. Top-suction range hoods use the principle of rising oil fumes to create a negative pressure zone directly above the stove, which absorbs and exhausts the naturally rising oil fumes generated during cooking. Its advantages are stylish and simple appearance, large air volume, suitable for larger spaces, and able to capture oil fumes far away from the stove. Its disadvantage is that the installation height is far away from the stove. When cooking with a small amount of oil fumes, the oil fumes above the pot are easily disturbed by the ambient air, causing the oil fumes to escape to the surroundings, resulting in poor oil fume extraction effect.

[0004] For this purpose, a smoke guide plate is usually arranged below the air inlet of the top suction range hood to form a ring suction structure, and the wall attachment effect is used to improve the oil fume suction effect. For example, a top suction range hood with a smoke guide plate disclosed in Chinese patent application number 201410419676.4 includes a machine body, a smoke hood and a smoke guide plate, wherein the smoke hood is connected to the machine body, a fan is arranged in the machine body, an air inlet is arranged on the smoke hood, the smoke guide plate is arranged opposite to the air inlet of the smoke hood, and is fixed to the smoke hood by a bracket or a buckle, and there is a distance between the smoke guide plate and the smoke hood to form an oil fume channel.

[0005] Since the range hoods using smoke guide plates do not drip oil and have good smoke absorption effect, they have been more and more widely used in recent years. Existing range hoods using smoke guide plates often have the following disadvantages:

[0006] 1. When a traditional range hood is used on an ordinary double stove, the amount of smoke generated by the stir-fry side and the soup-making side is very different, so it is impossible to adjust the air volume or air inlet area to adapt to the cooking situation;

[0007] 2. Although the air inlet of some range hoods can be adjusted according to the size of the oil smoke, it generally requires two sets of drive motors to achieve this separately, which is costly, has poor stability, and is difficult to popularize. Summary of the invention

[0008] The first technical problem to be solved by the present invention is to provide a range hood in view of the deficiencies in the above-mentioned prior art, which can realize the distribution of air inlet area and resistance to adapt to cooking conditions and improve the fume extraction effect.

[0009] The second technical problem to be solved by the present invention is to provide a control method for the above range hood.

[0010] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a range hood, comprising a smoke collecting hood, a fan frame arranged above the smoke collecting hood and a fan system arranged in the fan frame, the smoke collecting hood is provided with an air inlet, a smoke guide plate assembly is arranged below the air inlet, and the smoke guide plate assembly includes a main smoke guide plate located in the middle; the characteristics are:

[0011] A dynamic filter is provided in the fan frame below the fan system, and the dynamic filter can rotate around an axis extending forward and backward so as to face the left channel or the right channel in the fan frame;

[0012] The smoke guide plate assembly also includes a first auxiliary smoke guide plate located on the left side of the main smoke guide plate and a second auxiliary smoke guide plate located on the right side of the main smoke guide plate. The first auxiliary smoke guide plate and the second auxiliary smoke guide plate can both rotate around an axis extending forward and backward.

[0013] In order to facilitate the automatic driving of the dynamic filter to rotate, a motion mechanism capable of driving the dynamic filter to move is also arranged inside the fan frame, and the motion mechanism comprises a connecting bracket, a base and a driving mechanism. The base is fixedly arranged on the inner side of the fan frame, and the connecting bracket comprises a connecting rod for being connected and fixed to the dynamic filter. The connecting rod passes through the base and can be driven by the driving mechanism to rotate around an axis extending forward and backward, thereby driving the dynamic filter to rotate.

[0014] To facilitate the rotation of the auxiliary smoke guide plate, the movement mechanism also includes a transmission rod, a sliding rod and a pushing block. The sliding rod has two sliding rods and is respectively fixed on the left and right sides of the transmission rod and can move left and right synchronously. The pushing block has two sliding rods, and the two sliding rods are located between the two pushing blocks. The pushing block is arranged on the main smoke guide plate. When the sliding rod moves in a direction away from the other sliding rod, the pushing block can be pushed to move in a direction away from the other pushing block, thereby driving the corresponding auxiliary smoke guide plate to rotate, and each auxiliary smoke guide plate remains open and tends to be flattened.

[0015] Preferably, to facilitate the linkage between the dynamic filter and the auxiliary smoke guide plate, the movement mechanism also includes a first slider group and a second slider group, the base includes a top edge and a bottom edge arranged at intervals up and down, the connecting rod passes through the bottom edge of the base, the first slider group includes a first transverse slider and a first longitudinal slider, the first transverse slider is set on the top edge for sliding left and right, the first transverse slider is also connected to the transmission rod, and the first longitudinal slider is set on the transmission rod for sliding up and down; the second slider group includes a second transverse slider and a second longitudinal slider, the second transverse slider and the second longitudinal slider are respectively slidably set on the connecting bracket, the second transverse slider is rotatably connected to the first longitudinal slider so as to slide synchronously and rotate relatively, the second longitudinal slider is rotatably connected to the first transverse slider so as to slide synchronously and rotate relatively, and the rotation axis of the second transverse slider and the second longitudinal slider extends in the front-to-back direction, thereby driving the transmission rod to move left and right when the connecting bracket rotates.

[0016] To avoid interference between the two sliders of the second slider group, the connecting bracket is in an inverted T-shape, and the connecting bracket includes a first bracket and a second bracket that are perpendicular to each other. The first bracket is connected and fixed to the dynamic filter, the second transverse slider is arranged on the first bracket, and the second longitudinal slider is arranged on the second bracket.

[0017] To facilitate the cooperation between the sliding rod and the pushing block, the sliding rod is in a bent shape, with one part of the sliding rod extending in the left-right direction and the other part extending in the front-back direction after being bent. The part of the sliding rod extending left and right is used to connect with the transmission rod, and the part of the sliding rod extending front-back is used to push the corresponding pushing block.

[0018] In order to facilitate the conversion of the linear motion of the push block into the rotation of the auxiliary smoke guide plate, the motion mechanism also includes a rack arranged on the upper surface of the main smoke guide plate, a transmission gear meshing with the rack, and a transmission shaft rotatably connected to the main smoke guide plate, the transmission shaft can rotate around an axis extending forward and backward, the rack extends in the left and right directions, each auxiliary smoke guide plate corresponds to a rack and a transmission shaft, the above-mentioned push blocks are arranged at the ends of the racks close to each other, the push block and the rack move synchronously, the transmission gear is arranged around the transmission shaft and can rotate synchronously; each auxiliary smoke guide plate is connected and fixed to the transmission shaft on the corresponding side and can rotate synchronously.

[0019] To facilitate the automatic resetting of the auxiliary smoke guide plate, the movement mechanism also includes a support and an elastic member. The support has two and is arranged between two pushing blocks. Each support corresponds to a pushing block. The above-mentioned elastic member is connected between each support and the corresponding pushing block. The force applied by the elastic member to the pushing block keeps it moving toward the support, thereby keeping the corresponding auxiliary smoke guide plate flattened.

[0020] The first technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood as described above, characterized in that it comprises the following steps:

[0021] 1) The range hood starts and runs at the default gear;

[0022] 2) Obtain the current left-side fume concentration ya and right-side fume concentration yb;

[0023] 3) Compare ya and yb, set comparison reference values ​​m1 and m2, where m1 represents the preset lower limit of the difference, and m2 represents the preset upper limit of the difference, and perform corresponding control according to the comparison result:

[0024] 3.1) If the difference between ya and yb is greater than m2, it means that there is a significant difference in oil concentration on both sides. Then compare ya and yb and make corresponding controls based on the comparison results:

[0025] 3.1.1) If ya>yb, the first auxiliary smoke guide plate on the left is controlled to remain open and flat, the dynamic filter rotates toward the left channel, and the second auxiliary smoke guide plate on the right is folded and closed, and then proceed to step 4);

[0026] 3.1.2) If ya<yb, the second auxiliary smoke guide plate on the right side is controlled to remain open and flat, the dynamic filter rotates toward the right channel, and the first auxiliary smoke guide plate on the left side is folded and closed, and then proceed to step 4);

[0027] 3.2) If the difference between ya and yb is between m1 and m2, it is considered that there is a small difference in the fume concentration on both sides, and the rotation angle of the two auxiliary smoke guide plates is determined according to ya and yb;

[0028] 3.3) If the difference between ya and yb is less than m1, it is considered that there is no difference in the fume concentration on both sides, the dynamic filter is located in the middle position in the left and right directions and remains horizontally extended, the two auxiliary smoke guide plates are opened and flattened, and then go to step 4);

[0029] 4) Obtaining the current position information of the dynamic filter and each auxiliary smoke guide plate;

[0030] 5) Determine whether the current positions of the dynamic filter and each auxiliary smoke guide plate match the current cooking scene. If yes, return to step 2); if not, drive the dynamic filter and each auxiliary smoke guide plate to the corresponding state, wait for a time interval Δta, and return to step 4).

[0031] Preferably, in step 3), if It is judged that the difference between ya and yb exceeds m2; if The difference between ya and yb is judged to be between m1 and m2; if Then it is considered that the difference between ya and yb is smaller than m1.

[0032] The second technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood as described above, characterized in that it comprises the following steps:

[0033] 1) The range hood starts and runs at the default gear;

[0034] 2) Obtain the current left-side fume concentration ya and right-side fume concentration yb;

[0035] 3) Compare ya and yb, set comparison reference values ​​m1 and m2, where m1 represents the preset lower limit of the difference, and m2 represents the preset upper limit of the difference, and perform corresponding control according to the comparison result:

[0036] 3.1) If the difference between ya and yb is greater than m2, it means that there is a significant difference in oil concentration on both sides. Then compare ya and yb and make corresponding controls based on the comparison results:

[0037] 3.1.1) If ya>yb, the first auxiliary smoke guide plate on the left is controlled to remain open and flat, the dynamic filter rotates toward the left channel, and the second auxiliary smoke guide plate on the right is folded and closed, and then proceed to step 4);

[0038] 3.1.2) If ya<yb, the second auxiliary smoke guide plate on the right side is controlled to remain open and flat, the dynamic filter rotates toward the right channel, and the first auxiliary smoke guide plate on the left side is folded and closed, and then proceed to step 4);

[0039] 3.2) If the difference between ya and yb is between m1 and m2, it is considered that there is a small difference in the fume concentration on both sides, and the rotation angle of the two auxiliary smoke guide plates is determined according to ya and yb;

[0040] 3.3) If the difference between ya and yb is less than m1, it is considered that there is no difference in the fume concentration on both sides, the dynamic filter is located in the middle position in the left and right directions and remains horizontally extended, the two auxiliary smoke guide plates are opened and flattened, and then go to step 4);

[0041] 4) Obtaining the current position information of the dynamic filter and each auxiliary smoke guide plate;

[0042] 5) Determine whether the current positions of the dynamic filter and each auxiliary smoke guide plate match the current cooking scene. If yes, proceed to step 6); if not, drive the dynamic filter and each auxiliary smoke guide plate to the corresponding state, wait for a time interval Δta, and return to step 4);

[0043] 6) Obtain the current flow rate Qm flowing through the fan system;

[0044] 7) Determine whether Qm is within [Qx, Qd] of the corresponding cooking scene, where Qx and Qd are the upper and lower limits of the corresponding cooking scene, respectively. If yes, proceed to step 8); if not, proceed to step 9);

[0045] 8) Continue monitoring, monitoring times s = s + 1, determine whether s ≥ s1 is established, s1 is the preset threshold of monitoring times, if yes, write the gear and position of the current scene to the storage to update the preset value and reset s = 0, then return to step 2); if no, continue monitoring and return to step 2);

[0046] 9) If Qm>Qd, go to step 10); if Qm<Qx, go to step 12);

[0047] 10) Determine whether the gear position or speed of the fan system of the current range hood is the lowest. If yes, prompt for maintenance; if not, lower one gear and return to step 6);

[0048] 11) Determine whether the gear or speed of the current range hood fan system is the highest. If yes, prompt cleaning; if not, increase the gear by 1 and return to step 6).

[0049] Preferably, in step 3), if It is judged that the difference between ya and yb exceeds m2; if The difference between ya and yb is judged to be between m1 and m2; if Then it is considered that the difference between ya and yb is smaller than m1.

[0050] The third technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood as described above, characterized in that it comprises the following steps:

[0051] 1) The range hood is on standby mode;

[0052] 2) Record a set of left and right temperature information and obtain the left temperature value and the right temperature value;

[0053] 3) Determine whether there are two sets of temperature values ​​at different times. If yes, proceed to step 4); if not, wait for a time interval Δt and return to step 2);

[0054] 4) Calculate the temperature change slope kL on the left side = (TL2-TL1) / Δt, and calculate the temperature change slope kR on the right side = (TR2-TR1) / Δt; TL2 and TL1 are two sets of temperature values ​​on the left side, where TL2 is later, and TR2 and TR1 are two sets of temperature values ​​on the right side, where TR2 is later;

[0055] 5) Read the stored left temperature change slope reference value kLa and right temperature change slope reference value kRa;

[0056] 6) Compare kL and kLa, kR and kRa respectively. If |kL|>kLa and kL is positive, start the range hood to absorb oil smoke and go to step 8); if |kL|>kLa and kL is negative, or |kL|≤kLa, go to step 7); if |kR|>kRa and kR is positive, start the range hood to absorb oil smoke and go to step 8); if |kR|>kRa and kR is negative, or |kR|≤kRa, go to step 7);

[0057] 7) Determine whether TR2 is less than a preset right temperature reference value Tra and whether TL2 is less than a preset left temperature reference value TLa. If yes, do not start the range hood. If not, start the range hood to absorb oil smoke and go to step 8);

[0058] 8) Compare kL and kR. If kL-kR>kθ, it indicates that the cooking scene is mainly absorbing oil smoke on the left side, and go to step 9); if |kL-kR|<kθ, it indicates that the cooking scene on the left and right sides is the same, and go to step 9); if kR-kL>kθ, it indicates that the cooking scene is mainly absorbing oil smoke on the right side, and go to step 9); kθ is a preset threshold value of the temperature change slope difference;

[0059] 9) Determine whether there is a sudden change in the temperature value. If so, adjust the operation to the large oil smoke position under the corresponding cooking scene, and the fan system defaults to the large gear, and enter step 10); if not, adjust the operation to the small oil smoke position under the corresponding cooking scene, and the fan system defaults to the small gear, and enter step 10);

[0060] 10) Obtaining the current position information of the dynamic filter and each auxiliary smoke guide plate;

[0061] 11) Determine whether the position matches the current cooking scene. If yes, proceed to step 12). If no, drive the dynamic filter (4) and each auxiliary smoke guide plate to the corresponding position, wait for a time interval Δta, and return to step 10);

[0062] 12) Obtain the current flow rate Qm of the fan system;

[0063] 13) Determine whether Qm is within [Qx, Qd] of the corresponding cooking scene, where Qx and Qd are the upper and lower limits of the corresponding cooking scene, respectively. If yes, proceed to step 14); if not, proceed to step 15);

[0064] 14) Continue monitoring, monitoring times s = s + 1, determine whether s ≥ s1 is established, s1 is the preset threshold of monitoring times, if yes, write the gear and position of the current cooking scene into the storage to update the preset value and reset s = 0; if no, continue monitoring and return to step 2);

[0065] 15) Determine whether Qm is too large or too small. If it is too large, i.e., Qm>Qd, proceed to step 16); if it is too small, i.e., Qm<Qx, proceed to step 17);

[0066] 16) Determine whether the gear position or speed of the fan system of the current range hood is the lowest. If yes, prompt for maintenance; if not, lower one gear and return to step 12);

[0067] 17) Determine whether the gear or speed of the current range hood fan system is the highest. If yes, prompt cleaning; if not, increase the gear by 1 and return to step 12).

[0068] Preferably, in step 9), when the left or right side is the main oil fume inhalation channel, the control movable filter is rotated to the channel facing the main oil fume inhalation channel, and the auxiliary smoke guide plate on the main oil fume inhalation side is kept open and flat, while the auxiliary smoke guide plate on the other side is retracted and closed; when the left and right sides are the same, the control movable filter is extended laterally to be located in the middle position in the left and right directions, and both auxiliary smoke guide plates are opened.

[0069] The third technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood as described above, characterized in that it comprises the following steps:

[0070] 1) Turn on the range hood and run it in the default position or evenly on both sides;

[0071] 2) Obtain the current amount of oil smoke on the left and right sides;

[0072] 3) Determine whether the difference in the amount of oil smoke on the left and right sides is greater than a preset threshold, if yes, proceed to step 4), if no, proceed to step 6);

[0073] 4) The dynamic filter is driven to rotate toward the side with large oil smoke, the auxiliary smoke guide plate on the side with large oil smoke is kept open and flat, and the auxiliary smoke guide plate on the other side is folded and closed;

[0074] 5) Wait for a time interval Δt, read the position of the dynamic filter and each auxiliary smoke guide plate, and determine whether the position of the dynamic filter and each auxiliary smoke guide plate meets the cooking state. If yes, return to step 2); if no, repeat this step;

[0075] 6) Read the current position of the dynamic filter and each auxiliary smoke guide plate;

[0076] 7) Determine whether the current positions of the dynamic filter and each auxiliary smoke guide plate are in accordance with the cooking state. If yes, return to step 2); if no, drive the dynamic filter and each auxiliary smoke guide plate to move to the corresponding position;

[0077] 8) Wait for a time interval Δt, read the position of the dynamic filter and each auxiliary smoke guide plate again, and determine whether the position of the dynamic filter and each auxiliary smoke guide plate meets the cooking state. If yes, return to step 2); if not, repeat this step.

[0078] Compared with the prior art, the advantages of the present invention are: a mechanism is provided that can adjust the direction of the net (facing the main air inlet to improve the oil filtering capacity) and the secondary auxiliary smoke guide plates that can rotate on the left and right sides. Flow distribution can be achieved by flipping the secondary smoke guide plates to meet the needs of multiple scenarios; compared with conventional devices, there is only one driving mechanism, which has high stability and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] Figure 1 is a schematic diagram of a range hood in a first state according to an embodiment of the present invention;

[0080] Figure 2 is a cross-sectional view of the range hood according to an embodiment of the present invention in a first state;

[0081] Figure 3 for Figure 2 A schematic diagram of the dynamic filter and smoke guide plate of the range hood and their motion mechanism;

[0082] Figure 4 for Figure 3 A schematic diagram of the exploded structure of the moving mechanism of the moving filter and the smoke guide plate assembly;

[0083] Figure 5 for Figure 4 Schematic diagram of some parts;

[0084] Figure 6 is a schematic diagram of a range hood in a second state according to an embodiment of the present invention;

[0085] Figure 7 is a cross-sectional view of the range hood according to the embodiment of the present invention in a second state;

[0086] Figure 8 for Figure 7 A schematic diagram of the dynamic filter and smoke guide plate of the range hood and their motion mechanism;

[0087] Fig. 9 is a schematic diagram of a range hood in a third state according to an embodiment of the present invention;

[0088] Fig.10 is a cross-sectional view of the range hood according to the embodiment of the present invention in a third state;

[0089] Fig.11 for Fig.10 A schematic diagram of the dynamic filter and smoke guide plate of the range hood and their motion mechanism;

[0090] Fig.12 is a schematic diagram of a range hood in a fourth state according to an embodiment of the present invention;

[0091] Fig.13 is a cross-sectional view of the range hood according to the embodiment of the present invention in a fourth state;

[0092] Fig.14 for Fig.13 A schematic diagram of the dynamic filter and smoke guide plate of the range hood and their motion mechanism;

[0093] Fig.15 is a flow chart of a first control method for a range hood according to an embodiment of the present invention;

[0094] Fig.16 is a flow chart of a second control method for a range hood according to an embodiment of the present invention;

[0095] Fig.17 is a flow chart of a third control method of a range hood according to an embodiment of the present invention;

[0096] Fig.18 This is a flow chart of a fourth control method for a range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0097] 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.

[0098] 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.

[0099] See also Figure 1 to Figure 5 A range hood is a top suction range hood, comprising a fume hood 1 and a fan frame 2 arranged above the fume hood 1, wherein a fan system 3 is arranged in the fan frame 2. An air inlet 11 is provided on the fume hood 1, so that the fume can enter the fan frame 2 from the air inlet 11 during the upward rising process and be discharged by the fan system 3. The bottom of the fume hood 1 is recessed upward to form a fume collecting cavity 12, and the air inlet 11 is located at the top of the fume collecting cavity 12.

[0100] The space below the fan system 3 in the fan frame 2 is divided into a left channel and a right channel. A dynamic filter 4 is provided below the fan system 3 in the fan frame 2, that is, on the oil smoke flow path, upstream of the fan system 3. The dynamic filter 4 is preferably in a flat plate shape and can move inside the fan frame 2. A smoke guide plate assembly is provided below the air inlet 11. The oil smoke enters the inside of the fan frame 2 through the air inlet 11 from the periphery of the smoke guide plate assembly and the channel between the smoke collecting hood 1.

[0101] The dynamic filter 4 is a plate with meshes, which can change the resistance and can move inside the fan frame 2. The dynamic filter 4 is provided with meshes 41, so that the dynamic filter 4 can form a grid. The width of the dynamic filter 4 in the left-right direction is smaller than the width of the fan frame 2 in the left-right direction.

[0102] The smoke guide plate assembly includes a main smoke guide plate 61 located in the middle, a first auxiliary smoke guide plate 62 located on the left side of the main smoke guide plate 61 , and a second auxiliary smoke guide plate 63 located on the right side of the main smoke guide plate 61 .

[0103] A motion mechanism for driving the dynamic filter 4 and two auxiliary smoke guide plates is also provided inside the fan frame 2, wherein the portion of the motion mechanism for driving the dynamic filter 4 includes a connecting bracket 71, a first slider group 72, a second slider group 73, a base 74, a transmission rod 75 and a driving mechanism 76. The base 74 is fixedly arranged on the inner side of the fan frame 2, and can be directly fixed to the inner side of the fan frame 2, or indirectly fixed to the fan frame 2 through a mounting plate or the like. In this embodiment, the base 74 is arranged on the rear side of the fan frame 2, and the dynamic filter 4 is arranged on the front side of the base 74.

[0104] The connecting bracket 71 is in an inverted T-shape, and has a first bracket 711 and a second bracket 712 which are perpendicular to each other, wherein the first bracket 711 is connected and fixed to the dynamic filter 4, and can be fixed to the dynamic filter 4 through a connecting rod 713, and the connecting rod 713 extends in the front-to-back direction. Preferably, the dynamic filter 4 is rectangular, and the connecting rod 713 is connected to the middle position in the length direction of the dynamic filter 4. The driving mechanism 76 is a rotating driving mechanism, preferably, such as a motor, whose output end can be connected to the connecting rod 713 (the connection point is the rotation center of the connecting bracket 71), so as to drive the connecting bracket 71 and the dynamic filter 4 to rotate around the axis extending front-to-back.

[0105] The transmission rod 75 extends in the longitudinal direction, preferably in the up-down direction, and extends downward to the bottom of the air inlet 11. The base 74 is in the shape of a frame, including a top edge 741 and a bottom edge 742 arranged at intervals in the upper and lower directions. The first slider group 72 includes a first transverse slider 721 and a first longitudinal slider 722, wherein the first transverse slider 721 is slidably disposed on the top edge 741 and can slide in the left-right direction along the top edge 741, and the first transverse slider 721 is also connected to the transmission rod 75. The first longitudinal slider 722 is slidably disposed on the transmission rod 75 and can slide in the up-down direction along the transmission rod 75.

[0106] The second slider group 73 includes a second transverse slider 731 and a second longitudinal slider 732. The second transverse slider 731 is slidably disposed on the first bracket 711 of the connecting bracket 71 and can slide along the length direction of the first bracket 711. The second transverse slider 731 is rotatably connected to the first longitudinal slider 722 so that they can slide synchronously along the transmission rod 75 and rotate relatively. The second longitudinal slider 732 is slidably disposed on the second bracket 712 of the connecting bracket 71 and can slide along the length direction of the second bracket 712. The second longitudinal slider 732 is rotatably connected to the transmission rod 75.

[0107] The rotational connection of the first transverse slider 721, the first longitudinal slider 722, the second transverse slider 731 and the second longitudinal slider 732 is preferably realized by a pin, one of which passes through the first transverse slider 721 and the transmission rod 75 and is rotationally connected to the second longitudinal slider 732 (the pin is fixed to the first transverse slider 721 and the transmission rod 75, or vice versa), and the other pin rotationally connects the first longitudinal slider 722 and the second transverse slider 731, one of which is fixed and rotationally connected to the other slider. The axis of rotation of the second transverse slider 731 and the second longitudinal slider 732 extends in the front-rear direction.

[0108] To avoid interference, in this embodiment, the top edge 741 and the bottom edge 742 of the base 74 are arranged in a front-to-back spacing, the connecting bracket 71 is located between the top edge 741 and the bottom edge 742, and the connecting rod 713 passes through the bottom edge 742 and is connected to the dynamic filter 4. The transmission rod 75 is located at the rear side of the connecting bracket 71.

[0109] When the connecting bracket 71 is driven to rotate by the driving mechanism 76 , the transmission rod 75 can be driven to move in the left and right directions through the connection between the first transverse slider 721 , the first longitudinal slider 722 , the second transverse slider 731 , the second longitudinal slider 732 , the transmission rod 75 and the base 74 .

[0110] The above components of the motion mechanism are used to drive the dynamic filter 4 to move. The motion mechanism also includes components for driving the two auxiliary smoke guide plates to move, including a slide bar 79, a rack 81, a transmission gear 82, an elastic member 83 and a push block 84. Among them, there are two slide bars 79, which are fixedly arranged on the left and right sides of the transmission rod 75, respectively. The slide bar 79 is in a bent shape, one part of which extends along the left and right direction, and the other part is bent and extends along the front and rear direction. The left and right extending parts are connected to the transmission rod 75. Preferably, the slide bar 79 is L-shaped, and the two slide bars 79 are symmetrically arranged.

[0111] The upper surface of the main smoke guide plate 61 is provided with the above-mentioned rack 81, and the first auxiliary smoke guide plate 62 and the second auxiliary smoke guide plate 63 correspond to a rack 81 respectively, and the rack 81 extends in the left and right directions. The ends of the rack 81 close to each other are provided with the above-mentioned push blocks 84, and there are two push blocks 84, and each auxiliary smoke guide plate corresponds to a push block 84. The two slide bars 79 are located between the two push blocks 84, so that when the slide bars 79 move left and right (the slide bar 79 on the left side moves to the left, and the slide bar 79 on the right side moves to the right), the front and rear extending parts thereof can push the corresponding push block 84 to move in the direction away from the other push block 84, thereby driving the rack 81 to move in the direction away from the other rack 81. The transmission gear 82 is meshed with the rack 81, and can be set at the position close to the left and right sides of the upper surface of the main smoke guide plate 81, and each transmission gear 82 corresponds to a rack 81, so that when the rack 81 moves to the left or right, it can drive the transmission gear 82 to rotate, so that the corresponding auxiliary smoke guide plate is folded and closed.

[0112] The upper surface of the main smoke guide plate 61 is also provided with a bracket 85 near the left and right sides, and a transmission shaft 86 is provided on the bracket 85. The transmission shaft 86 extends in the front-rear direction and can rotate around its own axis relative to the bracket 85. The above-mentioned transmission gear 82 is sleeved on the outer periphery of the transmission shaft 86 and connected and fixed, so that the transmission gear 82 can drive the transmission shaft 86 to rotate. The first auxiliary smoke guide plate 62 and the second auxiliary smoke guide plate 63 are respectively connected to the transmission shaft 86 at the corresponding position, so that they can rotate with the transmission shaft 86. In this embodiment, the first auxiliary smoke guide plate 62 and the second auxiliary smoke guide plate 63 are respectively connected to the transmission shaft 86 through the shaft sleeve 64.

[0113] In this embodiment, the elastic member 83 is preferably a spring, and the motion mechanism also includes a support 87, and there are two supports 87, which are arranged between the two push blocks 84, and each support 87 corresponds to a push block 84. The above-mentioned elastic member 83 is connected between each support 87 and the corresponding push block 84. The force applied by the elastic member 83 to the push block 84 keeps it moving toward the support 87, thereby keeping the corresponding auxiliary smoke guide plate open (flattened, horizontal or nearly horizontal). After the auxiliary smoke guide plate is forced to close, when the external force disappears (in this embodiment, it is the force applied to the push block 84 by the transmission rod 75 through the slide bar 79), the push block 84 is reset under the action of the elastic member 83, so that the auxiliary smoke guide plate and the slide bar 79 are reset.

[0114] In this embodiment, the linkage between the dynamic filter 4 and the auxiliary smoke guide plate is realized by a driving mechanism 76 in combination with a base, a slider, etc., and the alternative dynamic filter 4 and the auxiliary smoke guide plate can also be independently driven to move up and down and rotate by two or three sets of driving mechanisms 76, and the driving mechanism 76 is adapted to select a linear driving mechanism or a rotating driving mechanism accordingly. In addition, a transmission gear 82 and a rack 81 are used as a linear-rotational motion conversion mechanism, and optionally, other linear-rotational motion conversion mechanisms can also be used, such as a combination of worm gears, a cylindrical cam mechanism, etc.

[0115] In actual use, the stove under the range hood is often stir-fried on one side, but it does not mean that the other side is not used or has no smoke intake. Its cooking state will switch between large and small smoke. The oil filtering capacity and resistance are a pair of contradictions related to each other. It is difficult to take both into account on ordinary range hoods. In the present invention, the angle of the dynamic filter 4 can be adjusted according to the working oil smoke conditions through the movement of the dynamic filter 4, thereby changing the resistance and oil filtering capacity, solving the contradiction that large oil smoke requires a large air volume and oil filtering can be temporarily ignored, while small oil smoke needs to focus on solving the oil filtering, so as to achieve large smoke to prioritize oil smoke suction and small smoke to prioritize oil filtering. Through the movement of the auxiliary smoke guide plate, the side with oil smoke is opened and the side without cooking is closed.

[0116] In the present invention, large oil smoke and small oil smoke refer to the actual working state flow rate after the range hood is installed in the user's home. The flow rate size can be defined according to laboratory test results. The flow rate dividing line can preferably be between 6 and 10 m 3 / min. There are slight differences depending on the height of the machine and the type of machine. For example, if the ceiling-type range hood is installed according to the standard (the installation range defined by the national standard is 650-750mm), the flow limit of the range hood 700mm away from the countertop may be 9m 3 When the installation height is adjusted to 750mm, the dividing line needs to be raised to 10m 3 To reduce the escape of oil smoke.

[0117] See also Figure 2 , which is the first working state of the range hood of the present invention, and is suitable for the situation that the cooking states on the left and right sides are similar. At this time, the dynamic filter 4 is located in the middle position in the left-right direction, ensuring that the oil and gas entering from the left and right sides are at a relatively small angle without any difference between one side and the other side; the sliding rod 79 and the pushing block 84 are not in contact, and the two auxiliary smoke baffles are in an open state (open means almost flush with the main smoke baffle 61), ensuring that the channels on both sides are consistent, and the negative pressure is more outward than that of ordinary range hoods.

[0118] See also Figures 6 to 8 , which is the second working state of the range hood of the present invention, and is suitable for the situation where the right side is the main oil smoke suction state and the left side is closed for cooking. At this time, the dynamic filter 4 is in a tilted state, with the lower end of the dynamic filter 4 close to the left side and the upper end close to the right side, keeping the angle with the main air inlet close to vertical (maximum oil filtering capacity), further improving its oil filtering capacity; at the same time, as the transmission rod 75 moves to the left, the sliding rod 79 on the left side drives the push block 84 to move to the left, and the rack 81 drives the transmission gear 82 to rotate, so that the first auxiliary smoke guide plate 62 on the left side is in a closed state (preferably vertical), making the right side the main air inlet channel. Vice versa, see Figures 9 to 11 .

[0119] See also Figure 12 to Figure 14 , which is the fourth working state of the range hood of the present invention, and is suitable for cooking scenes with large differences between the left and right sides, with main oil smoke being sucked on the right side and small oil smoke on the left side. At this time, the dynamic filter 4 is in a tilted state, with the lower end of the dynamic filter 4 close to the left side and the upper end close to the right side; at the same time, due to the movement of the transmission rod 75 to the left, the sliding rod 79 on the left side is driven to move the push block 84 to the left, and the rack 81 drives the transmission gear 82 to rotate, so that the first auxiliary smoke guide plate 62 on the left side is in an inwardly retracted state (preferably tilted with the vertical direction), so that the right side is the main air inlet channel (with the largest flow rate), and the left side is the secondary channel (with increased resistance and smaller flow rate), and the direction of the dynamic filter 4 is mainly toward the large oil smoke side.

[0120] The range hood of the present invention has the following control methods. Among them, the first control method can be to set a position sensor and an angle sensor on the connecting bracket 71, and use it in combination with the left and right double oil smoke sensors. The two oil smoke sensors can be respectively set at the bottom of the left and right sides of the smoke hood 1. The range hood has no power or current detection feedback. Fig.15 , specifically including the following steps:

[0121] 1) The range hood starts and runs at the default gear;

[0122] 2) Read the oil fume sensor information, including the information of the left oil fume sensor a and the right oil fume sensor b, to obtain the current left oil fume concentration ya and right oil fume concentration yb;

[0123] 3) Compare whether there is a significant difference in the oil smoke concentration detected by the current oil smoke sensor, and perform corresponding control according to the comparison result. ya represents the oil smoke concentration value on the left, yb represents the oil smoke concentration value on the right, and the reference values ​​are m1 and m2, where m1 represents the preset lower limit of the difference, and m2 represents the preset upper limit of the difference:

[0124] 3.1) If It indicates that there is a significant difference in oil concentration on both sides. Then compare ya and yb and make corresponding controls based on the comparison results:

[0125] 3.1.1) If ya>yb, the left channel is the main channel, the first auxiliary smoke guide plate 62 on the left is controlled to remain open and flat, the dynamic filter 4 rotates toward the left channel, and the second auxiliary smoke guide plate 63 on the right is folded and closed, and then enters step 4);

[0126] 3.1.2) If ya<yb, the second auxiliary smoke guide plate 63 on the right side is controlled to remain open and flat, the dynamic filter 4 rotates toward the right channel, and the first auxiliary smoke guide plate 62 on the left side is folded and closed, and then enters step 4);

[0127] In this step, the moving filter screen 4 faces the left channel or the right channel, which means that the moving filter screen 4 rotates to be basically located in the left channel or the right channel;

[0128] 3.2) If It is believed that there is a small difference in the oil smoke concentration on both sides. and The rotation angle of the two auxiliary smoke guide plates is determined by the size and relative ratio. The basis for determination is that the auxiliary smoke guide plate corresponding to the side of the oil smoke volume is flattened. The position of the dynamic filter 4 is also determined by the linkage with the auxiliary smoke guide plate.

[0129] 3.3) If It is considered that there is no difference in the oil smoke concentration on both sides, the dynamic filter 4 is located in the middle position in the left-right direction and remains horizontally extended, the two auxiliary smoke guide plates are opened and flattened, and then proceed to step 4);

[0130] 4) Obtaining the current position information of the dynamic filter 4 and each auxiliary smoke guide plate through the position / angle sensor on the connecting bracket 71 of the motion mechanism;

[0131] 5) Determine whether the current positions of the dynamic filter 4 and the auxiliary smoke guide plates match the current cooking scene. If yes, return to step 2); if not, the driving mechanism 76 drives the dynamic filter 4 and the auxiliary smoke guide plates to the corresponding state, waits for a time interval Δta, and returns to step 4).

[0132] In the above control flow, use As a reference value for comparison, this is because the oil fume concentration value of the oil fume sensor changes dynamically and needs to be converted and normalized to a certain characteristic range, so that the preset value can be set at the factory, which is easier to compare with the preset value. Therefore, it is considered to be converted to the range of [0, 1] to facilitate the setting of thresholds such as m1 and m2. At the same time, the denominator uses the value after subtracting the oil fume concentration values ​​detected by the two sensors, and the size can reflect their relative differences (large difference, small difference, large difference); however, when comparing values ​​from two different environments or different cooking stages, it may be thought that the problem of large dynamic changes in the oil fume concentration value leads to the inability to directly use the values ​​of the two stages to be compared by subtracting the values ​​of the two groups before and after. The oil fume concentration values ​​of the two groups of values, such as ya, yb, ya', yb', differ by more than ten times, or even hundreds of times.

[0133] Therefore, in this embodiment, consider using That is, the comparison range can be converted to [0, 1], and the left-right difference can be highlighted, which is convenient for comparing the left-right cooking difference at different times, different user environments, and different smoking cooking conditions.

[0134] For example:

[0135] At time A, ya=100, yb=700, the unit can be mg / m 3 or other unified unit;

[0136] At time B, ya=1000, yb=5000, the unit can be mg / m 3 or other unified units.

[0137] If the difference between the two moments is directly compared, the difference between 600 and 4000 is 1 order of magnitude, which is incomparable. However, by using the comparison method of the present invention, the difference at moment A is |100-700| / |100+700|=0.75, and the difference at moment B is |1000-5000| / |1000+5000|=0.66. It can be found that the two can be easily compared, and it is obvious that the difference around moment A is greater.

[0138] The second control method is different from the first control method in that the range hood structure used by the range hood has power or current detection feedback and can adjust the air volume or gear. Fig.16 , specifically including the following steps:

[0139] 1) The range hood starts and runs at the default gear;

[0140] 2) Read the oil fume sensor information, including the information of the left oil fume sensor a and the right oil fume sensor b, to obtain the current left oil fume concentration ya and right oil fume concentration yb;

[0141] 3) Compare whether there is a significant difference in the oil smoke concentration detected by the current oil smoke sensor, and perform corresponding control according to the comparison result. ya represents the oil smoke concentration value on the left, yb represents the oil smoke concentration value on the right, and the reference values ​​are m1 and m2, where m1 represents the preset lower limit of the difference, and m2 represents the preset upper limit of the difference:

[0142] 3.1) If It indicates that there is a significant difference in oil concentration on both sides. Then compare ya and yb and make corresponding controls based on the comparison results:

[0143] 3.1.1) If ya>yb, the left channel is the main channel, the first auxiliary smoke guide plate 62 on the left is controlled to remain open and flat, the dynamic filter 4 rotates toward the left channel, and the second auxiliary smoke guide plate 63 on the right is folded and closed, and then enters step 4);

[0144] 3.1.2) If ya<yb, the second auxiliary smoke guide plate 63 on the right side is controlled to remain open and flat, the dynamic filter 4 rotates toward the right channel, and the first auxiliary smoke guide plate 62 on the left side is folded and closed, and then enters step 4);

[0145] In this step, the moving filter screen 4 faces the left channel or the right channel, which means that the moving filter screen 4 rotates to be basically located in the left channel or the right channel;

[0146] 3.2) If It is believed that there is a small difference in the oil smoke concentration on both sides. and The rotation angle of the two auxiliary smoke guide plates is determined by the size and relative ratio. The basis for determination is that the auxiliary smoke guide plate corresponding to the side of the oil smoke volume is flattened. The position of the dynamic filter 4 is also determined by the linkage with the auxiliary smoke guide plate.

[0147] 3.3) If It is considered that there is no difference in the oil smoke concentration on both sides, the dynamic filter 4 is located in the middle position in the left-right direction and remains horizontally extended, the two auxiliary smoke guide plates are opened and flattened, and then proceed to step 4);

[0148] 4) Obtaining the current position information of the dynamic filter 4 and each auxiliary smoke guide plate through the position / angle sensor on the connecting bracket 71 of the motion mechanism;

[0149] 5) Determine whether the current positions of the dynamic filter 4 and the auxiliary smoke guide plates match the current cooking scene. If yes, proceed to step 6). If no, the driving mechanism 76 drives the dynamic filter 4 and the auxiliary smoke guide plates to the corresponding state, waits for a time interval Δta, and returns to step 4);

[0150] 6) Obtain the current power or speed, the power or speed coefficient of the current position, and thereby calculate the current flow rate Qm flowing through the fan system 3;

[0151] 7) Determine whether Qm is within [Qx, Qd] of the corresponding scene, where Qx and Qd are the upper and lower limits of the corresponding scene respectively. If yes, proceed to step 8); if not, proceed to step 9);

[0152] 8) Continue monitoring, monitoring times s = s + 1, determine whether s ≥ s1 is established, s1 is the preset threshold of monitoring times, if yes, write the gear and position of the current scene to the storage to update the preset value and reset s = 0, then return to step 2); if no, continue monitoring and return to step 2);

[0153] 9) Determine whether Qm is too large or too small. If it is too large, i.e., Qm>Qd, proceed to step 10); if it is too small, i.e., Qm<Qx, proceed to step 11);

[0154] 10) Determine whether the gear position or speed of the fan system 3 of the range hood is currently the lowest. If yes, prompt for maintenance; if not, lower the gear by one and return to step 6);

[0155] 11) Determine whether the gear or speed of the current range hood fan system is the highest. If yes, prompt cleaning; if not, increase the gear by 1 and return to step 6).

[0156] The third control method is different from the range hood structure used in the second control method in that the connecting bracket 71 does not have a position sensor, and only relies on the driving mechanism 76 to detect the rotation step, or the rotation angle is calculated based on the rotation speed and time product to determine the position of the two dynamic filters. The range hood is used with a temperature sensor, which can automatically switch the on / off state of the range hood. In the middle, it is confirmed whether the current mode is met based on the feedback of the air volume calculation and then adjust the state. Fig.17 , specifically including the following steps:

[0157] 1) The range hood is in standby mode and the temperature sensor is monitoring operation;

[0158] 2) Record a set of left and right temperature information, and obtain the value of the left temperature sensor L and the value of the right temperature sensor R;

[0159] 3) Determine whether there are two sets of different time values. If yes, proceed to step 4); if not, wait for a time interval Δt and return to step 2);

[0160] 4) Calculate the left and right temperature change slopes, the left temperature change slope kL = (TL2-TL1) / Δt and the right temperature change slope kR = (TR2-TR1) / Δt; TL2 and TL1 are the values ​​of the two groups of left temperature sensors, of which TL2 is later, TR2 and TR1 are the values ​​of the two groups of right temperature sensors, of which TR2 is later;

[0161] 5) Read the stored left and right temperature change slope reference values ​​kLa and kRa;

[0162] 6) Compare kL and kLa, kR and kRa respectively. If |kL|>kLa and kL is positive, start the range hood to smoke and go to step 8); if |kL|>kLa and kL is negative, or |kL|≤kLa, go to step 7); if |kR|>kRa and kR is positive, start the range hood to smoke and go to step 8); if |kR|>kRa and kR is negative, or |kR|≤kRa, go to step 7);

[0163] 7) Determine whether TR2 is less than a preset right temperature reference value Tra and whether TL2 is less than a preset left temperature reference value TLa. If yes, do not start the range hood. If not, start the range hood to smoke, and go to step 8);

[0164] 8) Compare kL and kR. If kL-kR>kθ, it means that the left side is the main smoking site, and the process goes to step 9); if |kL-kR|<kθ, it means that the left and right sides are the same, and the process goes to step 9); if kR-kL>kθ, it means that the right side is the main smoking site, and the process goes to step 9); kθ is a preset threshold value of the temperature change slope difference;

[0165] 9) Determine whether there is a sudden change in temperature value. If yes, adjust the dynamic filter 4 and each auxiliary smoke guide plate to the large oil smoke position of the corresponding cooking state, and the fan system defaults to the large gear, and enters step 10); if not, adjust the dynamic filter 4 and each auxiliary smoke guide plate to the small oil smoke position of the corresponding cooking state, and the fan system defaults to the small gear, and enters step 10); in the large oil smoke state or the small oil smoke state, when the left or right side is mainly used for oil smoke absorption, control the dynamic filter 4 to turn to the channel facing the main oil smoke absorption, and the auxiliary smoke guide plate on the main oil smoke absorption side is kept open and flat, and the auxiliary smoke guide plate on the other side is closed. When the left and right sides are the same, control the dynamic filter 4 to extend horizontally to be located in the middle position in the left and right directions, and both auxiliary smoke guide plates are opened;

[0166] 11) Determine whether the position matches the current cooking scene. If yes, proceed to step 12). If no, the driving mechanism 76 drives each movable filter to a corresponding state. After waiting for a time interval Δta, return to step 10);

[0167] 12) Obtaining the current power or speed, and the power or speed coefficient at the current position, thereby calculating the flow rate Qm currently flowing through the fan system 3 of the range hood;

[0168] 13) Determine whether Qm is within [Qx, Qd] of the corresponding scene, where Qx and Qd are the upper and lower limits of the corresponding scene respectively. If yes, proceed to step 14); if not, proceed to step 15);

[0169] 14) Continue monitoring, monitoring times s = s + 1, determine whether s ≥ s1 is established, s1 is the preset threshold of monitoring times, if yes, write the gear and position of the current scene into the storage to update the preset value and reset s = 0; if no, continue monitoring and return to step 2);

[0170] 15) Determine whether Qm is too large or too small. If it is too large, i.e., Qm>Qd, proceed to step 16); if it is too small, i.e., Qm<Qx, proceed to step 17);

[0171] 16) Determine whether the gear position or speed of the fan system 3 of the range hood is currently the lowest. If yes, prompt for maintenance; if not, lower one gear and return to step 12);

[0172] 17) Determine whether the gear position or speed of the current range hood fan system 3 is the highest. If yes, prompt cleaning; if not, increase the gear by 1 and return to step 12).

[0173] The fourth control method is to detect the rotation step only by the driving mechanism, or to calculate the rotation angle based on the rotation speed and time product, to obtain the position of the connecting bracket 71, which can accept the user selection mode or other sensor feedback values. Fig.18, specifically including the following steps:

[0174] 1) Turn on the range hood and run it in the default position or evenly on both sides;

[0175] 2) User input or electric feedback from the range hood or smoke or infrared sensors, etc., to obtain the cooking status, which is ultimately reflected as the current amount of oil smoke on the left and right sides;

[0176] 3) Determine whether the difference in the amount of oil smoke between the left and right sides is greater than a preset threshold, such as comparing the amount of oil smoke or temperature. The determination method may be as described in the first control method, the second control method, and the third control method, or a commonly used determination method in the art may be used; if yes, it indicates that there is an obvious difference between the two sides, and proceed to step 4); if no, proceed to step 6);

[0177] 4) The driving mechanism is started, and the dynamic filter 4 rotates toward the side with large oil smoke. The auxiliary smoke guide plate on the side with large oil smoke remains open and flat, and the auxiliary smoke guide plate on the other side is retracted and closed;

[0178] 5) Wait for a time interval Δt, read the position of the driving mechanism or the dynamic filter 4, and determine whether the motion mechanism has adjusted the dynamic filter 4 and the two auxiliary smoke guide plates into place. If yes, return to step 2); if not, repeat this step;

[0179] 6) Read the current position or angle of the connecting bracket 71 (i.e. the position or angle of the dynamic filter 4 and each auxiliary smoke guide plate) according to the step or angle of the driving mechanism;

[0180] 7) Determine whether the current positions of the dynamic filter 4 and the two auxiliary smoke guide plates are in accordance with the cooking state. If yes, return to step 2); if no, drive the dynamic filter 4 and the two auxiliary smoke guide plates to move to the corresponding positions;

[0181] 8) Wait for a time interval Δt, read the position of the drive mechanism or the dynamic filter 4 again, and determine whether the motion mechanism has adjusted the dynamic filter 4 and the two auxiliary smoke guide plates into place. If yes, return to step 2); if not, repeat this step.

Claims

1. A range hood, comprising a smoke collecting hood (1), a fan frame (2) arranged above the smoke collecting hood (1), and a fan system (3) arranged in the fan frame (2), wherein the smoke collecting hood (1) is provided with an air inlet (11), a smoke guide plate assembly is arranged below the air inlet (11), and the smoke guide plate assembly comprises a main smoke guide plate (61) located in the middle; characterized in that: A dynamic filter (4) is provided below the fan system (3) in the fan frame (2), and the dynamic filter (4) can rotate around an axis extending forward and backward so as to face the left channel or the right channel in the fan frame (2); The smoke guide plate assembly further comprises a first auxiliary smoke guide plate (62) located on the left side of the main smoke guide plate (61) and a second auxiliary smoke guide plate (63) located on the right side of the main smoke guide plate (61), wherein the first auxiliary smoke guide plate (62) and the second auxiliary smoke guide plate (63) are both capable of rotating around an axis extending forward and backward; A moving mechanism capable of driving the moving filter (4) to move is also provided inside the fan frame (2), the moving mechanism comprising a connecting bracket (71), a base (74) and a driving mechanism (76), the base (74) being fixedly arranged on the inner side of the fan frame (2), the connecting bracket (71) comprising a connecting rod (713) for connecting and fixing with the moving filter (4), the connecting rod (713) passing through the base (74) and being driven by the driving mechanism (76) to rotate around an axis extending forward and backward, thereby driving the moving filter (4) to rotate; The movement mechanism also includes a transmission rod (75), a sliding rod (79) and a pushing block (84). The sliding rod (79) has two and is respectively fixedly arranged on the left and right sides of the transmission rod (75) and can move left and right synchronously. The pushing block (84) has two, and the two sliding rods (79) are located between the two pushing blocks (84). The pushing block (84) is arranged on the main smoke guide plate (61). When the sliding rod (79) moves in a direction away from the other sliding rod (79), it can push the pushing block (84) to move in a direction away from the other pushing block (84), thereby driving the corresponding auxiliary smoke guide plate to rotate, and each auxiliary smoke guide plate remains open and has a tendency to be flattened.

2. The range hood according to claim 1, characterized in that: The motion mechanism further comprises a first slider group (72), a second slider group (73) and a transmission rod (75); the base (74) comprises a top edge (741) and a bottom edge (742) which are arranged at intervals from top to bottom; the connecting rod (713) passes through the bottom edge (742) of the base (74); the first slider group (72) comprises a first transverse slider (721) and a first longitudinal slider (722); the first transverse slider (721) is slidably arranged on the top edge (741) from left to right; the first transverse slider (721) is also connected to the transmission rod (75); the first longitudinal slider (722) is slidably arranged on the transmission rod (75) from top to bottom; the second slider group (74) comprises a first transverse slider (721) and a first longitudinal slider (722); (73) comprises a second transverse slider (731) and a second longitudinal slider (732), wherein the second transverse slider (731) and the second longitudinal slider (732) are respectively slidably arranged on the connecting bracket (71), the second transverse slider (731) is rotatably connected to the first longitudinal slider (722) so as to be able to slide synchronously and rotate relatively, and the second longitudinal slider (732) is rotatably connected to the first transverse slider (721) so as to be able to slide synchronously and rotate relatively, and the rotation axes of the second transverse slider (731) and the second longitudinal slider (732) extend in the front-rear direction, thereby driving the transmission rod (75) to move left and right when the connecting bracket (71) rotates.

3. The range hood according to claim 2, characterized in that: The connecting bracket (71) is in an inverted T-shape, and comprises a first bracket (711) and a second bracket (712) which are perpendicular to each other, the first bracket (711) being connected and fixed to the moving filter (4), the second transverse slider (731) being arranged on the first bracket (711), and the second longitudinal slider (732) being arranged on the second bracket (712).

4. The range hood according to claim 1, characterized in that: The slide bar (79) is in a bent shape, a portion of the slide bar (79) extends in the left-right direction and another portion of the slide bar (79) extends in the front-back direction after being bent, the left-right extending portion of the slide bar (79) is used to connect with the transmission rod (75), and the front-back extending portion of the slide bar (79) is used to push the corresponding pushing block (84).

5. The range hood according to claim 1, characterized in that: The motion mechanism also includes a rack (81) arranged on the upper surface of the main smoke guide plate (61), a transmission gear (82) meshing with the rack (81), and a transmission shaft (86) rotatably connected to the main smoke guide plate (61); the transmission shaft (86) can rotate around an axis extending forward and backward; the rack (81) extends in the left and right directions; each auxiliary smoke guide plate corresponds to a rack (81) and a transmission shaft (86); the above-mentioned push block (84) is arranged at the ends of the rack (81) close to each other; the push block (84) and the rack (81) move synchronously; the transmission gear (82) is arranged around the transmission shaft (86) and can rotate synchronously; each auxiliary smoke guide plate is connected and fixed to the transmission shaft (86) on the corresponding side and can rotate synchronously.

6. The range hood according to claim 1, characterized in that: The movement mechanism also includes a support (87) and an elastic member (83). The support (87) has two and is arranged between two pushing blocks (84). Each support (87) corresponds to one pushing block (84). The elastic member (83) is connected between each support (87) and the corresponding pushing block (84). The force applied by the elastic member (83) to the pushing block (84) causes it to maintain a tendency to move toward the support (87), thereby causing the corresponding auxiliary smoke guide plate to maintain a tendency to flatten.

7. A control method for a range hood according to any one of claims 1 to 6, characterized in that: The steps include: 1) The range hood starts and runs at the default gear; 2) Obtain the current left-side oil fume concentration ya and right-side oil fume concentration yb; 3) Compare ya and yb, set comparison reference values ​​m1 and m2, where m1 represents the preset lower limit of the difference, and m2 represents the preset upper limit of the difference, and perform corresponding control according to the comparison result: 3.1) If the difference between ya and yb is greater than m2, it means that there is a significant difference in oil concentration on both sides. Then compare ya and yb and make corresponding controls based on the comparison results: 3.1.1) If ya>yb, the first auxiliary smoke guide plate (62) on the left side is controlled to remain open and flat, the dynamic filter (4) rotates toward the left channel, and the second auxiliary smoke guide plate (63) on the right side is folded and closed, and then enters step 4); 3.1.2) If ya<yb, the second auxiliary smoke guide plate (63) on the right side is controlled to remain open and flat, the dynamic filter (4) rotates toward the right channel, and the first auxiliary smoke guide plate (62) on the left side is folded and closed, and then enters step 4); 3.2) If the difference between ya and yb is between m1 and m2, it is considered that there is a small difference in the smoke concentration on both sides, and the rotation angle of the two auxiliary smoke guide plates is determined according to ya and yb; 3.3) If the difference between ya and yb is less than m1, it is considered that there is no difference in the oil smoke concentration on both sides, the dynamic filter (4) is located in the middle position in the left and right directions and remains horizontally extended, the two auxiliary smoke guide plates are opened and flattened, and then proceed to step 4); 4) obtaining current position information of the dynamic filter (4) and each auxiliary smoke guide plate; 5) Determine whether the current positions of the dynamic filter (4) and each auxiliary smoke guide plate match the current cooking scene. If so, return to step 2); if not, drive the dynamic filter (4) and each auxiliary smoke guide plate to a corresponding state, wait for a time interval Δta, and return to step 4).

8. The control method of the range hood according to claim 7, characterized in that: In step 3), if It is judged that the difference between ya and yb exceeds m2; if The difference between ya and yb is judged to be between m1 and m2; if Then it is considered that the difference between ya and yb is smaller than m1.

9. A control method for a range hood according to any one of claims 1 to 6, characterized in that: The steps include: 1) The range hood starts and runs at the default gear; 2) Obtain the current left-side oil fume concentration ya and right-side oil fume concentration yb; 3) Compare ya and yb, set comparison reference values ​​m1 and m2, where m1 represents the preset lower limit of the difference, and m2 represents the preset upper limit of the difference, and perform corresponding control according to the comparison result: 3.1) If the difference between ya and yb is greater than m2, it means that there is a significant difference in oil concentration on both sides. Then compare ya and yb and make corresponding controls based on the comparison results: 3.1.1) If ya>yb, the first auxiliary smoke guide plate (62) on the left side is controlled to remain open and flat, the dynamic filter (4) rotates toward the left channel, and the second auxiliary smoke guide plate (63) on the right side is folded and closed, and then enters step 4); 3.1.2) If ya<yb, the second auxiliary smoke guide plate (63) on the right side is controlled to remain open and flat, the dynamic filter (4) rotates toward the right channel, and the first auxiliary smoke guide plate (62) on the left side is folded and closed, and then enters step 4); 3.2) If the difference between ya and yb is between m1 and m2, it is considered that there is a small difference in the smoke concentration on both sides, and the rotation angle of the two auxiliary smoke guide plates is determined according to ya and yb; 3.3) If the difference between ya and yb is less than m1, it is considered that there is no difference in the oil smoke concentration on both sides, the dynamic filter (4) is located in the middle position in the left and right directions and remains horizontally extended, the two auxiliary smoke guide plates are opened and flattened, and then proceed to step 4); 4) obtaining current position information of the dynamic filter (4) and each auxiliary smoke guide plate; 5) determining whether the current positions of the dynamic filter (4) and each auxiliary smoke guide plate match the current cooking scene; if so, proceeding to step 6); if not, driving the dynamic filter (4) and each auxiliary smoke guide plate to a corresponding state, waiting for a time interval Δta, and returning to step 4); 6) Obtain the current flow rate Qm flowing through the fan system (3); 7) Determine whether Qm is within [Qx, Qd] of the corresponding cooking scene, where Qx and Qd are the upper and lower flow limits of the corresponding cooking scene, respectively. If yes, proceed to step 8); if not, proceed to step 9); 8) Continue monitoring, monitoring times s = s + 1, determine whether s ≥ s1 is established, s1 is the preset threshold of the monitoring times, if yes, the gear and position of the fan system (3) of the current scene are written into the storage to update the preset value and reset s = 0, and then return to step 2); if no, continue monitoring and return to step 2); 9) If Qm>Qd, go to step 10); if Qm<Qx, go to step 12); 10) Determine whether the gear position or speed of the fan system (3) of the range hood is currently the lowest. If yes, prompt for maintenance; if not, lower the gear by one and return to step 6); 11) Determine whether the gear position or speed of the fan system (3) of the range hood is currently at the highest level. If yes, prompt cleaning; if not, increase the gear by one level and return to step 6).

10. The control method of the range hood according to claim 9, characterized in that: In step 3), if It is judged that the difference between ya and yb exceeds m2; if The difference between ya and yb is judged to be between m1 and m2; if Then it is considered that the difference between ya and yb is smaller than m1.

11. A control method for a range hood according to any one of claims 1 to 6, characterized in that: The steps include: 1) The range hood is on standby mode; 2) Record a set of left and right temperature information and obtain the left temperature value and the right temperature value; 3) Determine whether there are two sets of temperature values ​​at different times. If yes, proceed to step 4); if not, wait for a time interval Δt and return to step 2); 4) Calculate the temperature change slope kL on the left side = (TL2-TL1) / Δt, and calculate the temperature change slope kR on the right side = (TR2-TR1) / Δt; TL2 and TL1 are two sets of temperature values ​​on the left side, where TL2 is later, and TR2 and TR1 are two sets of temperature values ​​on the right side, where TR2 is later; 5) Read the stored left temperature change slope reference value kLa and right temperature change slope reference value kRa; 6) Compare kL and kLa, kR and kRa respectively. If |kL|>kLa and kL is positive, start the range hood to absorb oil smoke and go to step 8); if |kL|>kLa and kL is negative, or |kL|≤kLa, go to step 7); if |kR|>kRa and kR is positive, start the range hood to absorb oil smoke and go to step 8); if |kR|>kRa and kR is negative, or |kR|≤kRa, go to step 7); 7) Determine whether TR2 is less than a preset right temperature reference value Tra and whether TL2 is less than a preset left temperature reference value TLa. If yes, do not start the range hood. If not, start the range hood to absorb oil smoke and go to step 8); 8) Compare kL and kR. If kL-kR>kθ, it indicates that the cooking scene is mainly absorbing oil smoke on the left side, and go to step 9); if |kL-kR|<kθ, it indicates that the cooking scene on the left and right sides is the same, and go to step 9); if kR-kL>kθ, it indicates that the cooking scene is mainly absorbing oil smoke on the right side, and go to step 9); kθ is a preset threshold value of the temperature change slope difference; 9) Determine whether there is a sudden change in the temperature value. If so, adjust the fan to operate at a large oil smoke position in the corresponding cooking scene, and the fan system (3) defaults to a large gear, and enter step 10); if not, adjust the fan to operate at a small oil smoke position in the corresponding cooking scene, and the fan system (3) defaults to a small gear, and enter step 10); 10) obtaining current position information of the dynamic filter (4) and each auxiliary smoke guide plate; 11) Determine whether the position matches the current cooking scene. If yes, proceed to step 12). If no, drive the dynamic filter (4) and each auxiliary smoke guide plate to the corresponding position, wait for a time interval Δta, and return to step 10); 12) Obtain the current flow rate Qm of the fan system (3); 13) Determine whether Qm is within [Qx, Qd] of the corresponding cooking scene, where Qx and Qd are the upper and lower flow limits of the corresponding cooking scene, respectively. If yes, proceed to step 14); if not, proceed to step 15); 14) Continue monitoring, monitoring times s = s + 1, determine whether s ≥ s1 is established, s1 is the preset threshold of the monitoring times, if yes, the gear and position of the fan system (3) of the current cooking scene are written into the storage to update the preset value and reset s = 0; if no, continue monitoring and return to step 2); 15) Determine whether Qm is too large or too small. If it is too large, i.e., Qm>Qd, proceed to step 16); if it is too small, i.e., Qm<Qx, proceed to step 17); 16) Determine whether the gear position or speed of the fan system (3) of the range hood is currently the lowest. If yes, prompt for maintenance; if not, lower the gear by one and return to step 12); 17) Determine whether the gear position or speed of the current range hood fan system (3) is the highest. If yes, prompt cleaning; if not, increase the gear by one and return to step 12).

12. The control method of the range hood according to claim 11, characterized in that: In step 9), when the oil smoke is mainly sucked from the left or right side, the control movable filter (4) is turned to the channel facing the main oil smoke suction, and the auxiliary smoke guide plate on the main oil smoke suction side is kept open and flat, while the auxiliary smoke guide plate on the other side is folded and closed; when the left and right sides are the same, the control movable filter (4) is horizontally extended to be located in the middle position in the left and right directions, and both auxiliary smoke guide plates are opened.

13. A control method for a range hood according to any one of claims 1 to 6, characterized in that: The steps include: 1) Turn on the range hood and run it in the default position or evenly on both sides; 2) Obtain the current amount of oil smoke on the left and right sides; 3) Determine whether the difference in the amount of oil smoke on the left and right sides is greater than a preset threshold, if yes, proceed to step 4), if no, proceed to step 6); 4) driving the dynamic filter (4) to rotate toward the side with large oil smoke, the auxiliary smoke guide plate on the side with large oil smoke remains open and flat, and the auxiliary smoke guide plate on the other side is retracted and closed; 5) Waiting for a time interval Δt, reading the positions of the dynamic filter (4) and each auxiliary smoke guide plate, and determining whether the positions of the dynamic filter (4) and each auxiliary smoke guide plate are in accordance with the cooking state, if yes, returning to step 2), if no, repeating this step; 6) Read the current position of the dynamic filter (4) and each auxiliary smoke guide plate; 7) determining whether the current positions of the dynamic filter (4) and each auxiliary smoke guide plate are in accordance with the cooking state, if yes, returning to step 2), if no, driving the dynamic filter (4) and each auxiliary smoke guide plate to move to the corresponding position; 8) Wait for a time interval Δt, read the position of the dynamic filter (4) and each auxiliary smoke guide plate again, and determine whether the position of the dynamic filter (4) and each auxiliary smoke guide plate conforms to the cooking state. If yes, return to step 2); if not, repeat this step.

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