Control method of range hood and range hood

Abstract

The invention relates to the technical field of kitchen electric appliances, and particularly discloses a control method of an extractor hood and the extractor hood. The control method of the extractor hood comprises the steps that the current oil smoke concentration V is obtained; judging the current oil smoke concentration V, the first oil smoke concentration V1 and the second oil smoke concentration V2; if V is larger than V1 and smaller than V2, the main fan operates at the set working gear; the theoretical operation power P1 of the main draught fan is determined based on the set working gear; the actual operation power P2 of the main draught fan is obtained; the maximum operation power P3 of the auxiliary fan and the maximum air volume X of the auxiliary air inlet are obtained; the ratio of the variable quantity X of the air volume of the main air inlet to the variable quantity P of the operation power of the main fan is obtained; determining the operation power Pn of the auxiliary fan based on P1, P2, P3, X, X / P; and the auxiliary fan operates at the power Pn, so that the actual oil smoke suction capacity of the range hood cannot be reduced under the condition that the performance of the main fan is inconsistent.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a control method for a range hood and a range hood. Background Art

[0002] As an important appliance in the kitchen, the main function of a range hood is to quickly and effectively remove the oil fumes generated during cooking to keep the kitchen air fresh. With the increasing emphasis on the kitchen environment and health by people, the performance requirements for range hoods are also getting higher and higher.

[0003] In the prior art, a range hood is provided with a main fan and an auxiliary fan. Compared with a range hood having only one fan, through the cooperation of the main fan and the auxiliary fan, the suction range of the oil fumes can be improved, and further the escape amount to the outside when the oil fume amount is large can be reduced. However, it does not consider the differences in batches of the motor or power supply board of the main fan, as well as the looseness of the components caused by the transportation process, resulting in differences in the overall structure consistency. This leads to instability in the actual oil fume suction effect when the range hood is in actual use. Summary of the Invention

[0004] The purpose of the present invention is to provide a control method for a range hood to improve the stability of the oil fume suction effect of the range hood on the premise of differences in the overall structure consistency.

[0005] On the one hand, the present invention provides a control method for a range hood. The range hood includes an auxiliary fan and a main fan. The auxiliary fan can suck oil fumes through an auxiliary air inlet, and the main fan can suck oil fumes through a main air inlet. The control method for the range hood includes:

[0006] Obtain the current oil fume concentration V;

[0007] Judge the magnitude relationship between the current oil fume concentration V and the first oil fume concentration V1 and the second oil fume concentration V2, where V2 > V1;

[0008] If V1 < V < V2, then the main fan operates at a set working gear;

[0009] Determine the theoretical operating power P1 of the main fan based on the set working gear;

[0010] Obtain the actual operating power P2 of the main fan;

[0011] Obtain the maximum operating power P3 of the auxiliary fan and the maximum air volume X of the auxiliary air inlet;

[0012] Obtain the ratio of the change amount △X of the air volume at the main air inlet to the change amount △P of the operating power of the main fan;

[0013] Determine the operating power P of the auxiliary fan based on P1, P2, P3, X, and △X / △P n ;

[0014] The auxiliary fan operates at power P n operation.

[0015] As a preferred technical solution of the control method of the range hood, determine the operating power P of the auxiliary fan based on P1, P2, P3, X, and △X / △P n including:

[0016] Determine the target operating power P of the auxiliary fan x ;

[0017] P x =(P1 - P2)*(△X / △P)*(P3 / X)+b;

[0018] where △X, △P, and b are all constants;

[0019] P n equals the smaller value between P x and P3.

[0020] As a preferred technical solution of the control method of the range hood, when judging the magnitude of the current oil fume concentration V, the first oil fume concentration V1, and the second oil fume concentration V2, if V ≤ V1; then determine the required air volume X1 of the auxiliary air inlet based on the current oil fume concentration V;

[0021] Judge the magnitude of the actual air volume X1 and the preset air volume X n ;

[0022] If X1 < X n , then turn off the main fan and turn on the auxiliary fan, and adjust the power of the auxiliary fan to make the air volume of the auxiliary air inlet equal to X1; if X1 ≥ X n , then return to the step of operating the main fan at the set working gear;

[0023] where, when the air volume of the auxiliary air inlet exceeds X n , the intensity of the noise generated by the auxiliary air inlet exceeds the set value.

[0024] As a preferred technical solution of the control method of the range hood, when judging the magnitude of the current oil fume concentration V, the first oil fume concentration V1, and the second oil fume concentration V2, if V ≥ V2; then obtain the actual vibration frequency I of the range hood and calculate the difference △I between the actual vibration frequency I of the range hood and the set vibration frequency I n ;

[0025] Determine the rotational speed W of the auxiliary fan n and the rotational speed W of the main fan m;

[0026] The auxiliary fan operates at a rotational speed of W n and the main fan operates at a rotational speed of W m .

[0027] As a preferred technical solution of the control method of the range hood, the rotational speed W of the auxiliary fan and the rotational speed W of the main fan are determined based on the magnitude of △I n and include: m

[0028] Judge the magnitude of △I and the first set vibration frequency I a ;

[0029] If △I < I a ; then W n = W1 - △I * W1 / (5 * I a ), W m = W2; W1 is the maximum rotational speed of the auxiliary fan, and W2 is the maximum rotational speed of the main fan.

[0030] As a preferred technical solution of the control method of the range hood, when judging the magnitude of △I and I a , if △I ≥ I a , then judge the magnitude of △I and (I a + I b ); I b is the second set vibration frequency;

[0031] If I a ≤ △I ≤ (I a + I b ), then W n = 0.8 * W1, W m = W2 - W2 * (△I - I a ) / (10 * I b ).

[0032] As a preferred technical solution of the control method of the range hood, when judging the magnitude of △I and (I a + I b ), if △I > (I a + I b ), then W n = 0.8 * W1, W m = 0.9 * W2.

[0033] The control method of the range hood provided by the present invention has at least the following beneficial effects:

[0034] ​The control method of the range hood includes: obtaining the current oil fume concentration V; judging the magnitude relationship between the current oil fume concentration V and the first oil fume concentration V1 and the second oil fume concentration V2; if V1 < V < V2, the main fan operates at a set working gear; determining the theoretical operating power P1 of the main fan based on the set working gear; obtaining the actual operating power P2 of the main fan; obtaining the maximum operating power P3 of the auxiliary fan and the maximum air volume X of the auxiliary air inlet; obtaining the ratio of the change in the air volume △X of the main air inlet to the change in the operating power △P of the main fan; determining the operating power P of the auxiliary fan based on P1, P2, P3, X, and △X / △P n ; the auxiliary fan operates at the power P n Even if the actual operating power of the main fan fails to reach the theoretical operating power due to inconsistent performance of the main fan, resulting in the actual air volume of the main air inlet not reaching the theoretical air volume of the main air inlet, the control method of this range hood can determine the power P of the auxiliary fan n When the auxiliary fan operates at the power P n During operation, it can make up for the difference between the theoretical air volume of the main air inlet and the actual air volume of the main air inlet through the air volume of the auxiliary air inlet, so that the actual oil fume suction capacity of the range hood remains unchanged, thereby ensuring that the oil fume suction effect meets the actual working condition requirements

[0035] On the other hand, the present invention provides a range hood, which includes an auxiliary fan and a main fan. The auxiliary fan can suck oil fume through the auxiliary air inlet, and the main fan can suck oil fume through the main air inlet. The range hood is used to implement the control method of the range hood described in any of the above solutions

[0036] As a preferred technical solution of the range hood, the range hood further includes:

[0037] A smoke collecting hood, both the main air inlet and the auxiliary air inlet are arranged on the smoke collecting hood;

[0038] A main cabinet, which is communicated with the smoke collecting hood. The main fan is installed in the main cabinet. The main fan is provided with a main air duct, an air inlet that is respectively communicated with the main cabinet and the main air duct, and an exhaust port that is communicated with the main air duct;

[0039] An auxiliary air duct, both ends of the auxiliary air duct are respectively communicated with the auxiliary air inlet and the main air duct, and the auxiliary fan is arranged in the auxiliary air duct

[0040] As a preferred technical solution of the range hood, the range hood further includes a control valve arranged in the auxiliary air duct. The control valve is configured to be able to prevent air flow from flowing from the main air duct to the auxiliary air inlet; and / or

[0041] The range hood further includes a smoke collecting plate, which is movably connected to the smoke collecting hood, and the smoke collecting plate is used to open or close the main air inlet.

[0042] The range hood provided by the present invention has at least the following beneficial effects:

[0043] The range hood is used to execute the control method of the above range hood. Under the condition of consistent structural differences in the whole machine, it can ensure the stable smoke extraction effect of the range hood. Description of the Drawings

[0044] Figure 1 It is a cross-sectional view of the range hood in the embodiment of the present invention;

[0045] Figure 2 It is a structural schematic diagram of the range hood in the embodiment of the present invention;

[0046] Figure 3 It is a structural schematic diagram of the air outlet hole in the embodiment of the present invention;

[0047] Figure 4 It is a structural schematic diagram of the auxiliary air duct, the support member and the auxiliary fan in the embodiment of the present invention;

[0048] Figure 5 is Figure 1 an enlarged view of part A in

[0049] Figure 6 It is the first flow chart of the control method of the range hood in the embodiment of the invention;

[0050] Figure 7 It is the second flow chart of the control method of the range hood in the embodiment of the invention;

[0051] Figure 8 It is the third flow chart of the control method of the range hood in the embodiment of the invention;

[0052] Figure 9 It is the fourth flow chart of the control method of the range hood in the embodiment of the invention.

[0053] In the figure:

[0054] 1. Smoke collecting hood; 11. Main air inlet; 12. Auxiliary air inlet; 13. Front side plate; 14. Baffle; 15. Flange;

[0055] 2. Main machine box; 21. Front wall; 22. Rear wall;

[0056] 3. Main fan; 31. Volute; 311. Main air duct; 312. Air inlet; 313. Exhaust port; 32. Impeller;

[0057] 4. Auxiliary air duct; 41. Housing; 411. Oil leakage hole; 42. First air duct; 43. Second air duct;

[0058] 5. Auxiliary fan; 6. Control valve; 7. Smoke collecting plate;

[0059] 8. Support member; 81. First bracket; 811. First side; 812. Second side; 813. Bottom surface; 814. Top surface; 815. First oil guiding surface; 816. Second oil guiding surface; 82. Second bracket;

[0060] 9. Air outlet hole;

[0061] 10. Smoke sensor module. Detailed implementation manner

[0062] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0063] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or only indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or only indicating that the first feature has a lower horizontal height than the second feature.

[0064] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0065] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0066] This embodiment provides a control method for an oil fume extractor, and the control method of the oil fume extractor is implemented by the oil fume extractor.

[0067] Among them, the oil fume extractor can specifically be a top-mounted oil fume extractor, a side-mounted oil fume extractor, etc. The oil fume extractor can be used in the kitchen to process the oil fume generated during the cooking process.

[0068] Specifically, as Figure 1 and Figure 2 shown, the oil fume extractor includes an auxiliary fan 5 and a main fan 3. The auxiliary fan 5 can suck oil fume through the auxiliary air inlet 12, and the main fan 3 can suck oil fume through the main air inlet 11. When the oil fume extractor is working, according to the cooking environment, it can be selected to only turn on the auxiliary fan 5, only turn on the main fan 3, or turn on the main fan 3 and the auxiliary fan 5 at the same time, so that the oil fume extractor can have three different oil fume suction capabilities, and thus adapt to the oil fume suction needs under different oil fume concentrations.

[0069] In an optional embodiment, the maximum power of the main fan 3 is greater than the maximum power of the auxiliary fan 5. Both the main fan 3 and the auxiliary fan 5 adopt variable-frequency fans.

[0070] In an optional embodiment, please refer to Figure 1 and Figure 2, the range hood further includes a smoke collecting hood 1, a main machine box 2, and an auxiliary air duct 4. Among them, the main air inlet 11 and the auxiliary air inlet 12 are both provided on the smoke collecting hood 1; the main machine box 2 is communicated with the smoke collecting hood 1; the main fan 3 is installed in the main machine box 2, the main fan 3 is provided with a main air duct 311, an air inlet 312, and an exhaust port 313, the air inlet 312 is respectively communicated with the main machine box 2 and the main air duct 311, and the exhaust port 313 is communicated with the main air duct 311; the auxiliary fan 5 is arranged in the auxiliary air duct 4, and both ends of the auxiliary air duct 4 are respectively communicated with the auxiliary air inlet 12 and the main air duct 311. Driven by the main fan 3, the cooking fume enters the main air duct 311 successively through the main air inlet 11, the inner cavity of the smoke collecting hood 1, the inner cavity of the main machine box 2, and the air inlet 312; under the negative pressure drive of the auxiliary fan 5, the cooking fume is directly discharged into the main air duct 311 of the main fan 3 successively through the auxiliary air inlet 12 and the auxiliary air duct 4, and then is mixed with the cooking fume inhaled into the main air duct 311 by the main fan 3 and is discharged into the smoke exhaust channel through the exhaust port 313. Since the auxiliary fan 5 directly discharges the cooking fume into the main air duct 311, this part of the cooking fume does not waste the negative pressure of the main fan 3, and the fume exhaust capacity of the range hood is equivalent to the superposition of the effects of the main fan 3 and the auxiliary fan 5, effectively improving the fume exhaust performance of the range hood.

[0071] In an optional embodiment, please refer to Figure 1 , the main fan 3 includes a volute 31 and an impeller 32 arranged in the volute 31. The volute 31 is fixedly arranged in the main machine box 2, and the volute 31 is located in the inner cavity of the main machine box 2. The volute 31 forms the main air duct 311, the air inlet 312, and the exhaust port 313. The air inlet 312 is communicated with the inner cavity of the main machine box 2, and the exhaust port 313 is communicated with the smoke exhaust channel. Driven by the impeller 32, the cooking fume enters the main air duct 311 from the main air inlet 11 through the inner cavity of the smoke collecting hood 1 and the inner cavity of the main machine box 2 through the air inlet 312, and is discharged into the smoke exhaust channel through the exhaust port 313. Among them, one air inlet 312 can be arranged on the volute 31, and this air inlet 312 is located at one end of the axial direction of the impeller 32; or two air inlets 312 are arranged on the volute 31. The two air inlets 312 are respectively located at both ends of the axial direction of the impeller 32.

[0072] In an optional embodiment, please refer to Figure 3 , the auxiliary air duct 4 is communicated with the main air duct 311 through a plurality of spaced air outlet holes 9. With such an arrangement, when the main fan 3 is turned on alone, the plurality of air outlet holes 9 can reduce the pressure loss in the main air duct 311, reduce the cooking fume entering from the main air duct 311 into the auxiliary air duct 4, and reduce the influence on the fume suction effect of the main fan 3.

[0073] In an alternative embodiment, the air outlet hole 9 may be the inner hole of the pipe fitting, that is, the auxiliary air duct 4 and the main air duct 311 are communicated through a plurality of pipe fittings. In other embodiments, the air outlet hole 9 may also be an opening provided on the sheet metal. For example, a plurality of air outlet holes 9 may be provided on the volute 31, and the duct wall of the auxiliary air duct 4 is directly fixed to the volute 31; alternatively, a plurality of air outlet holes 9 are provided on the duct wall of the auxiliary air duct 4, the auxiliary air duct 4 is inserted into the volute 31, and a plurality of air outlet holes 9 are communicated with the main air duct 311.

[0074] In an alternative embodiment, please refer to Figure 1 , the air outlet hole 9 is arranged towards the air outlet. With such an arrangement, when the auxiliary fan 5 operates, the oil fume in the auxiliary air duct 4 enters the main air duct 311 through the air outlet hole 9 and then directly flows towards the air outlet, so that this part of the oil fume can be more easily discharged from the air outlet, which can improve the oil fume exhaust capacity of the range hood. In addition, the air outlet hole 9 can also be arranged close to the air outlet, so that the air outlet hole 9 is closer to the air outlet. When the auxiliary fan 5 operates, the oil fume entering the main air duct 311 through the air outlet hole 9 can also more easily enter the air outlet, which can also improve the oil fume exhaust capacity of the range hood.

[0075] In an alternative embodiment, please refer to Figure 1 , the range hood further includes a control valve 6. The control valve 6 is arranged in the auxiliary air duct 4, and the control valve 6 can prevent the air flow from flowing from the main air duct 311 to the auxiliary air inlet 12. By providing the control valve 6, when the main fan 3 is turned on alone, under the action of the control valve 6, even if the oil fume in the main air duct 311 enters the auxiliary air duct 4 through a plurality of air outlet holes 9, the oil fume ultimately cannot flow to the auxiliary air inlet 12, which can completely prevent the main fan 3 from being depressurized, and thus ensure that the oil fume suction effect of the main fan 3 is not affected.

[0076] Among them, the control valve 6 can be set as a one-way valve. The one-way valve is configured to only allow the air flow to flow from the auxiliary air inlet 12 to the main flue and can prohibit the air flow from flowing from the main flue to the auxiliary air inlet 12. Preferably, the one-way valve is arranged between the auxiliary fan 5 and the main air duct 311. In other embodiments, the one-way valve can also be arranged between the auxiliary fan 5 and the auxiliary air inlet 12. In addition, the control valve 6 can also be set as a switch valve. The switch valve can open or close the auxiliary air duct 4. When the main fan 3 is turned on alone, by closing the auxiliary air duct 4 through the switch valve, the air flow between the auxiliary air inlet 12 and the main air duct 311 can be blocked, and the noise can also be reduced.

[0077] In an alternative embodiment, please refer to Figure 1 and Figure 2, the range hood further includes a smoke collecting plate 7, which is movably connected to the smoke collecting hood 1, and the smoke collecting plate 7 is used to open or close the main air inlet 11. When only the auxiliary fan 5 is turned on, after the auxiliary fan 5 discharges the cooking fumes into the main air duct 311, the cooking fumes will enter the inner cavity of the main body casing 2 and the inner cavity of the smoke collecting hood 1 in sequence through the air inlet 312. At this time, closing the main air inlet 11 through the smoke collecting plate 7 can prevent the cooking fumes from leaking from the main air inlet 312 of the smoke collecting hood 1 into the room, thereby preventing the auxiliary fan 5 from being depressurized and ensuring that the smoke extraction effect of the auxiliary fan 5 is not affected. In other embodiments, the smoke collecting plate 7 can also be replaced by a valve. The valve can be arranged at the air inlet 312 of the main fan 3 to open or close the air inlet 312, or the valve is arranged in the smoke collecting hood 1, and the valve can cut off or communicate the inner cavity of the smoke collecting hood 1, which can also prevent the auxiliary fan 5 from being depressurized when it works alone.

[0078] In an alternative embodiment, please refer to Figure 1 , the auxiliary air inlet 12 is arranged downward, where the up and down directions are as Figure 1 shown by the arrows ab in

[0079] In an alternative embodiment, please refer to Figure 1 and Figure 2 , the main air inlet 11 is opened forward. The front and rear directions are as Figure 1 shown by the arrows cd in

[0080] In an alternative embodiment, the smoke collecting hood 1 includes a front side plate 13 arranged parallel to the front wall 21 of the main body casing 2, and a baffle 14 connected between the front side plate 13 and the front wall 21. The front side plate 13 is located behind the front wall 21. The main air inlet 11 is arranged on the front side plate 13, and the auxiliary air inlet 12 is arranged on the baffle 14. Specifically, the main air inlet 11 is arranged at the lower end of the front side plate 13. With such an arrangement, the main air inlet 11 is arranged forward; the auxiliary air inlet 12 is arranged downward. It can be understood that the baffle 14 extends forward relative to the front wall 21 and can be located above the cooking appliance, so that the auxiliary air inlet 12 can be located on the path of the upward flowing cooking fumes.

[0081] In an optional embodiment, the range hood further includes a smoke sensor module 10 disposed on the baffle 14, and the smoke sensor module 10 is used to detect the concentration of cooking fumes.

[0082] In an optional embodiment, please refer to Figures 1 to 3 , the range hood further includes a support member 8, the auxiliary air duct 4 is fixed to the support member 8, and the support member 8 is simultaneously fixed to the main casing 2 and the baffle 14. With such a setting, it can be ensured that the position of the auxiliary air duct 4 in the main casing 2 and the smoke collecting hood 1 remains stable. In other embodiments, the support member 8 can also be fixed only to the main casing 2 or only to the smoke collecting hood 1 according to needs. Preferably, the auxiliary air duct 4 can be processed from sheet metal parts, so that the auxiliary air duct 4 has strong structural strength and a long service life. In other embodiments, the auxiliary air duct 4 can also adopt a corrugated pipe.

[0083] In an optional embodiment, the structural shape of the support member 8 can be set according to the structural shape of the auxiliary air duct 4. Specifically, please refer to Figures 1 to 3 , the auxiliary air duct 4 includes a housing 41, and a first air duct 42 and a second air duct 43 arranged at an angle. The housing 41 is communicated with the auxiliary air inlet 12, the first air duct 42 is communicated with the housing 41, and the second air duct 43 is communicated with the main air duct 311; the support member 8 includes a first bracket 81 and a second bracket 82 connected at an angle. The first bracket 81 is fixedly connected to the rear wall 22 of the main casing 2, the second bracket 82 is fixedly connected to the baffle 14, the first air duct 42 is arranged on the first bracket 81, and the second air duct 43 is arranged on the second bracket 82. Specifically, the housing 41 is attached to the baffle 14. With such a setting, by supporting the first air duct 42 through the first bracket 81 and supporting the second air duct 43 through the second bracket 82, the position stability of the auxiliary air duct 4 can be further improved.

[0084] In an optional embodiment, both the first air duct 42 and the second air duct 43 are arranged in a V shape, and both the first bracket 81 and the second bracket 82 are arranged in a V shape. Specifically, both the second bracket 82 and the second air duct 43 are arranged in the vertical direction, both the first bracket 81 and the first air duct 42 are arranged obliquely, and the top end of the first bracket 81 is connected to the second bracket 82, the bottom end of the first bracket 81 is connected to the baffle 14, the bottom end of the first air duct 42 is communicated with the housing 41, and the top end of the first air duct 42 is communicated with the second air duct 43.

[0085] In an optional embodiment, the bottom end of the first bracket 81 is welded to the baffle 14, the second bracket 82 is attached to the rear wall 22 of the main casing 2, and the second bracket 82 is welded to the rear wall 22 of the main casing 2. In other embodiments, the first bracket 81 can also be fixed to the baffle 14 by screws, and the second bracket 82 can be fixed to the rear wall 22 of the main casing 2 by screws.

[0086] In an optional embodiment, the auxiliary fan 5 is disposed at the junction of the first air duct 42 and the second air duct 43, which can ensure that the cooking fume only changes its moving direction through the auxiliary fan 5 in the auxiliary air duct 4, with relatively small air resistance. In addition, the auxiliary fan 5 is supported by the first bracket 81 and the second bracket 82 at the same time, which can ensure the stable position of the auxiliary fan 5. In other embodiments, the auxiliary fan 5 can also be disposed in the first air duct 42 or the second air duct 43 according to needs.

[0087] In an optional embodiment, along the left-right direction, both the support member 8 and the auxiliary air duct 4 are centered, and there are intervals between the left and right ends of the inner cavity of the support member 8 and the smoke collecting hood 1, between the left and right ends of the inner cavity of the support member 8 and the main chassis 2, between the left and right ends of the inner cavity of the auxiliary air duct 4 and the smoke collecting hood 1, and between the left and right ends of the inner cavity of the auxiliary air duct 4 and the main chassis 2, so as to ensure the smooth flow of the cooking fume between the inner cavity of the smoke collecting hood 1 and the inner cavity of the main chassis 2.

[0088] In an optional embodiment, please refer to Figure 3 , the first bracket 81 includes a first side surface 811 and a second side surface 812 arranged at intervals, a bottom surface 813 connected between the bottom ends of the first side surface 811 and the second side surface 812, a top surface 814 located between the first side surface 811 and the second side surface 812, a first oil guiding surface 815 connected between the top end of the first side surface 811 and the top surface 814, a second oil guiding surface 816 connected between the top end of the second side surface 812 and the top surface 814, and the first air duct 42 is disposed on the top surface 814; the distance between the first oil guiding surface 815 and the second oil guiding surface 816 gradually increases from top to bottom; and / or, the distance between the first side surface 811 and the second side surface 812 gradually decreases from top to bottom. Among them, in this embodiment, a scheme in which the distance between the first oil guiding surface 815 and the second oil guiding surface 816 gradually increases from top to bottom and the distance between the first side surface 811 and the second side surface 812 gradually decreases from top to bottom is exemplarily given. When the main fan 3 is working, the cooking fume flows from the inner cavity of the smoke collecting hood 1 into the inner cavity of the main chassis 2. Since both the first bracket 81 and the first air duct 42 span between the baffle 14 and the rear wall 22 of the main chassis 2, oil stains are likely to accumulate on the surfaces of the first bracket 81 and the first air duct 42. Among them, the oil stains on the surface of the first air duct 42 will flow to the top surface 814, and then flow to the first side surface 811 under the guidance of the first oil guiding surface 815, flow to the second side surface 812 under the guidance of the second oil guiding surface 816, and drip into the inner cavity of the smoke collecting hood 1 for collection after converging at the lower ends of the first side surface 811 and the second side surface 812, and finally converge into the oil cup below the smoke collecting hood 1. In other embodiments, it can also be made that only the distance between the first oil guiding surface 815 and the second oil guiding surface 816 gradually increases from top to bottom according to needs; or only the distance between the first side surface 811 and the second side surface 812 gradually decreases from top to bottom.

[0089] In an alternative embodiment, along the left - right direction, the first air duct 42 is centrally disposed on the top surface 814, and the width dimension of the first air duct 42 along the left - right direction is smaller than the width dimension of the top surface 814 along the left - right direction, so that after the oil stain drips from the first air duct 42, it can all converge onto the top surface 814, and then converge into the inner cavity of the smoke collecting hood 1 through the outer surface of the first bracket 81.

[0090] In an alternative embodiment, both the first oil - guiding surface 815 and the second oil - guiding surface 816 are flat surfaces, and both the first oil - guiding surface 815 and the second oil - guiding surface 816 form a 45° angle with the top surface 814. In other embodiments, the angles between the first oil - guiding surface 815 and the second oil - guiding surface 816 and the top surface 814 can also be set according to actual needs; or, the first oil - guiding surface 815 and the second oil - guiding surface 816 can also be set as arc - shaped surfaces.

[0091] In an alternative embodiment, both the first side surface 811 and the second side surface 812 form a 60° angle with the bottom surface 813. In other embodiments, the angles between the first side surface 811 and the second side surface 812 and the bottom surface 813 can also be set according to actual needs.

[0092] In an alternative embodiment, the baffle 14 is inclined, the front end of the baffle 14 is higher than the rear end of the baffle 14, the rear end of the housing 41 is lower than the front end of the housing 41, and an oil leakage hole 411 is provided at the rear end of the housing 41. With such a setting, the oil stain accumulated on the baffle 14 can flow downward by its own gravity and converge into the inner cavity of the smoke collecting hood 1; at the same time, the oil stain on the inner wall of the first air duct 42 can flow into the inner wall of the housing 41 under the action of its own gravity, and can converge onto the inner surface of the baffle 14, then can converge along the baffle 14 to the rear end of the housing 41, and can flow out of the housing 41 through the oil leakage hole 411, realizing the collection of the oil stain in the auxiliary air duct 4.

[0093] In an alternative embodiment, the baffle 14 is provided with a flange 15, the flange 15 surrounds the auxiliary air inlet 12, and the flange 15 is covered inside the housing 41. By providing the flange 15 for blocking, it can prevent the oil stain on the surface of the baffle 14 located inside the housing 41 from flowing into the auxiliary air inlet 12, ensure that the oil stain can finally converge at the rear end of the housing 41, flow out from the oil leakage hole 411, and further converge into the inner cavity of the smoke collecting hood 1.

[0094] The range hood further includes one or more processors; a storage device for storing one or more programs; when the one or more programs are executed by the one or more controllers, the one or more controllers control the range hood to implement the following control method of the range hood.

[0095] Please refer toFigure 6 , the control method of this range hood includes the following steps:

[0096] S100: Obtain the current oil fume concentration V.

[0097] Specifically, the current oil fume concentration V can be obtained through a smoke sensor module.

[0098] S110: Judge the magnitudes of the current oil fume concentration V, the first oil fume concentration V1, and the second oil fume concentration V2.

[0099] If V1 < V < V2, then execute S120.

[0100] Among them, V2 > V1. Specifically, the first oil fume concentration V1 and the second oil fume concentration V2 can be pre-stored in the memory, and the first oil fume concentration V1 and the second oil fume concentration V2 can be set according to the specific model of the range hood. For different models of range hoods, the first oil fume concentration V1 and the second oil fume concentration V2 are also different.

[0101] In this embodiment, when V1 < V < V2, it indicates that the oil fume concentration is relatively high at this time, and the main fan needs to operate at a set working gear. The main fan will operate at a certain power, but the main fan does not need to reach the maximum power. Due to the difference in the overall machine consistency, the performance of the main fan may fluctuate. For example, when the main fan operates at a specific gear, the main fan will operate at the theoretical operating power, but due to the performance fluctuation of the main fan, the actual operating power of the main fan cannot reach the theoretical operating power. And the control program built into the range hood is developed for a range hood with stable consistency. Therefore, at this time, relying only on the main fan to work alone, the air volume of the main air inlet sucking the oil fume cannot match the current oil fume concentration. At this time, it is necessary to turn on the auxiliary hood to make up for the reduction in the air volume of the main air inlet caused by the reduction in the operating power of the main fan.

[0102] S120: The main fan operates at a set working gear.

[0103] S130: Determine the theoretical operating power P1 of the main fan based on the set working gear.

[0104] The memory pre-stores a first corresponding relationship between the set working gear and the theoretical operating power of the main fan. According to the first mapping relationship and the set working gear, the theoretical operating power of the main fan can be determined.

[0105] It is understandable that for a normal range hood, the performance of the main fan is normal. When the main fan runs at the theoretical operating power, the air volume at the main air inlet can reach the theoretical air volume accordingly. However, this is usually for range hoods that can maintain consistency with the range hoods in the theoretical test process. For subsequent range hoods shipped from the factory, due to various reasons, such as different batches of fans or power boards, the performance of the main fan may be inconsistent, and the actual operating power of the main fan may not reach the theoretical operating power, so that the actual air volume at the main air inlet will not reach the theoretical air volume. Therefore, once the actual operating power of the main fan does not reach the theoretical operating power, it is necessary to compensate by the auxiliary fan to ensure that the oil fume extraction performance of the range hood will not be reduced.

[0106] S140: Obtain the actual operating power P2 of the main fan.

[0107] The operating power P2 of the main fan can be determined by obtaining the current and voltage supplied to the main fan.

[0108] S150: Obtain the maximum operating power P3 of the auxiliary fan and the maximum air volume X of the auxiliary air inlet.

[0109] The maximum operating power P3 of the auxiliary fan and the maximum air volume X of the auxiliary air inlet are pre-stored in the memory, which is related to the specific model of the auxiliary fan.

[0110] S160: Obtaining a ratio of a change in the air volume at the main air inlet △X to a change in the operating power of the main fan △P.

[0111] The ratio of △X to △P is pre-stored in the memory. Both △P and △X can be obtained through a large number of experiments in the early stage. Specifically, samples are collected from the main fans of several range hoods with poor consistency. The power difference between the theoretical operating power of the main fan and the actual operating power of the main fan is obtained when the main fan of each range hood with poor consistency is set to run at the working gear, and the air volume difference between the theoretical air volume of the main air inlet and the actual air volume of the main air inlet is obtained. Then, the ratio of the air volume difference to the power difference is calculated, and finally the average of the obtained multiple ratios is taken to obtain the ratio of △X to △P. Specifically, △P and △X are roughly positively correlated.

[0112] S170: Determine the operating power P of the auxiliary fan based on P1, P2, P3, X, △X / △P n .

[0113] S180: Auxiliary fan with power P n run.

[0114] Even if the actual operating power of the main fan fails to reach the theoretical operating power due to inconsistent performance, resulting in the actual air volume at the main air inlet not reaching the theoretical air volume at the main air inlet, the power P of the auxiliary fan can be determined through step S160 n , when the auxiliary fan operates at power P n , the difference between the theoretical air volume at the main air inlet and the actual air volume at the main air inlet can be compensated by the air volume at the auxiliary air inlet, so that the actual oil fume suction capacity of the range hood remains unchanged, and further ensure that the oil fume suction effect meets the actual working condition requirements.

[0115] In an alternative embodiment, please refer to Figure 7 , in step S170, based on P1, P2, P3, X, △X / △P to determine the operating power P of the auxiliary fan n includes the following steps:

[0116] S171: Determine the target operating power P of the auxiliary fan x .

[0117] P x =(P1 - P2)*(△X / △P)*(P3 / X)+b; where △X, △P and b are all constants.

[0118] In this embodiment, the value of P x is determined through the above mathematical model. In other embodiments, the value of P x can also be determined through other models, such as a deep learning model.

[0119] It should be noted that the value of P x is determined through the mathematical model in S171 above. When P n =P x , the auxiliary fan operates at the operating power of P x . Theoretically, the air volume compensated by the auxiliary fan can exactly make up for the reduction in air volume caused by the performance deviation of the main fan. However, for the actual situation, due to consistency and resistance problems, there will be a certain deviation value. Therefore, the value of b is the compensation deviation power, which can be adjusted according to the design margin.

[0120] S172: P n is equal to the smaller value of P x and P3.

[0121] It can be understood that the value of P x may exceed the maximum operating power of the auxiliary fan. At this time, P n =P3 to avoid the operating power of the auxiliary fan exceeding the specification; the value of P x may also not exceed the maximum operating power of the auxiliary fan. At this time, make P n= P x , the auxiliary fan makes the increase in the air volume of the auxiliary air inlet exactly compensate for the decrease in the air volume of the main air inlet caused by the inconsistent performance of the main fan.

[0122] In an optional embodiment, please refer to Figure 8 , in step S110, if V ≤ V1, then execute S190.

[0123] When V ≤ V1, it indicates that the oil fume concentration is small at this time, and the auxiliary fan working alone can meet the demand for oil fume extraction. However, the auxiliary fan working alone may also cause the noise generated at the auxiliary air inlet to exceed the standard and affect the user experience. Therefore, it is necessary to perform differential control based on the actual situation.

[0124] S190: Determine the required air volume X1 of the auxiliary air inlet based on the current oil fume concentration V.

[0125] Specifically, a second mapping relationship between the current oil fume concentration and the required air volume of the auxiliary air inlet is pre-stored in the memory, and the required air volume of the auxiliary air inlet can be determined according to the second mapping relationship and the current oil fume concentration. Among them, the second mapping relationship can be obtained based on a large number of previous experiments.

[0126] S200: Judge the magnitude of the actual air volume X1 and the preset air volume X n .

[0127] If X1 < X n , then execute S210, if X1 ≥ X n , then return to step S120.

[0128] S210: Turn off the main fan and turn on the auxiliary fan, and adjust the power of the auxiliary fan so that the air volume of the auxiliary air inlet is equal to X1.

[0129] Among them, when the air volume of the auxiliary air inlet exceeds X n , the intensity of the noise generated at the auxiliary air inlet exceeds the set value. At this time, the user will feel a sharp whistling sound generated at the auxiliary air inlet, which affects the user experience. Therefore, when X1 < X n , it indicates that turning on the auxiliary fan alone can not only meet the current oil fume extraction demand, but also the auxiliary air inlet will not generate abnormal noise; when X1 ≥ X n , it indicates that if the auxiliary fan is turned on and the current oil fume extraction demand is met, the auxiliary air inlet will easily generate abnormal noise. Therefore, the auxiliary fan should not be turned on, but the auxiliary fan should work together with the main fan to meet the oil fume extraction demand.

[0130] Among them, the higher the flow velocity of the air flow passing through the auxiliary air inlet, the easier it is to generate abnormal noise. Specifically, the area of the auxiliary air inlet is m. When the wind speed of the auxiliary air inlet is greater than n, the auxiliary air inlet will generate a whistling sound, that is, abnormal noise. m and n can be determined according to the specific model of the range hood.

[0131] In an optional embodiment, please refer to Figure 8 , in step S110, if V≥V2, then execute S220.

[0132] When V≥V2, it indicates that the oil fume concentration is very high at this time. At this time, the user is usually in the stir-frying operation mode. For a range hood with consistent stability, at this time, both the main fan and the auxiliary fan need to operate at the highest speed to provide the maximum oil fume suction capacity so that the oil fume can be discharged in time. However, due to the difference in the overall consistency, there may be a situation where the firmness of the main fan and / or the auxiliary fan is inconsistent. When loosening occurs, the faster the impeller rotates, the greater the overall vibration frequency of the machine, and the easier it is to generate abnormal noise. Therefore, for a range hood with poor consistency, if the main fan and / or the auxiliary fan continue to operate at the highest speed, it is easy to cause the overall vibration frequency of the machine to exceed the standard, and then abnormal noise appears, affecting the user experience. At this time, it is necessary to appropriately reduce the speed of the main fan and / or the auxiliary fan.

[0133] S220: Obtain the actual vibration frequency I of the range hood and calculate the difference △I between the actual vibration frequency I of the range hood and the set vibration frequency I n of the range hood.

[0134] The actual vibration frequency I of the range hood can be detected by a vibration detection sensor. The set vibration frequency I n can be pre-stored in the memory. When △I>0, the range hood may generate abnormal noise.

[0135] S230: Determine the speed W n of the auxiliary fan and the speed W m of the main fan based on the magnitude of △I.

[0136] Specifically, a corresponding relationship diagram of △I, the speed of the auxiliary fan, and the speed of the main fan is pre-stored in the memory. According to the corresponding relationship diagram and △I, the corresponding speed of the auxiliary fan and the speed of the main fan can be queried. Among them, the corresponding relationship diagram can be obtained through a large number of previous experiments.

[0137] S240: The auxiliary fan operates at speed W n , and the main fan operates at speed W m .

[0138] Through steps S220 to S240, it is possible to avoid the generation of abnormal noise in the range hood and make the oil fume suction effect of the range hood reach the maximum.

[0139] Specifically, please refer to Figure 9 , step S230 includes the following steps:

[0140] S231: Determine the magnitude of △I and the first set vibration frequency I a .

[0141] If △I < I a ; then execute S232; if △I ≥ I a , then execute S233.

[0142] S232: W n = W1 - △I * W1 / (5 * I a ), W m = W2.

[0143] Wherein, W1 is the maximum speed of the auxiliary fan, and W2 is the maximum speed of the main fan.

[0144] When △I < I a , it indicates that the vibration frequency of the range hood in actual use is larger than that of a normal range hood in the current mode, which causes abnormal noise in the range hood. Usually, it is caused by the loosening of the auxiliary fan. Therefore, only the speed of the auxiliary fan needs to be lowered.

[0145] Wherein, I a = I1 - I2, and I1 and I2 can be obtained through a large number of previous experiments. Specifically, by collecting samples of several range hoods with poor consistency, obtaining the first vibration frequency of each range hood with poor consistency when the auxiliary fan runs at the limit speed W1 and the main fan runs at the limit speed W2, and then taking the average of the first vibration frequencies of the obtained range hoods as I1; by collecting samples of several range hoods with poor consistency, obtaining the second vibration frequency of each range hood with poor consistency when the auxiliary fan runs at the speed of 0.8 * W1 and the main fan runs at the limit speed W2, and then taking the average of the second vibration frequencies of the obtained range hoods as I2. The speeds of the auxiliary fan and the main fan can be detected by a speed sensor.

[0146] It is found through experiments that the change amount of the vibration frequency of the range hood is approximately proportional to the change amount of the speed of the auxiliary fan, and the ratio of the change amount of the vibration frequency of the range hood to the change amount of the speed of the auxiliary fan is approximately 5 * I a / W1. Therefore, when △I < I a , adjusting the vibration frequency of the auxiliary fan from W1 to (W1 - △I * W1 / (5 * I a )) can eliminate the abnormal noise of the range hood.

[0147] S233: Determine the magnitude of △I and (I a + I b ), Ib is the second set vibration frequency.

[0148] If I a ≤△I≤(I a +I b ), then execute S234; if △I>(I a +I b ), then execute S235.

[0149] S234: W n = 0.8*W1, W m = W2 - W2*(△I - I a ) / (10*I b ).

[0150] S235: W n = 0.8*W1, W m = 0.9*W2.

[0151] Among them, I b = I3 - I4, and I3 and I4 can be obtained through a large number of previous experiments. Specifically, by collecting samples of several range hoods with poor consistency, obtaining the third vibration frequency of the range hood when the auxiliary fan of each range hood with poor consistency runs at the limit speed of 0.85*W1 and the main fan runs at the limit speed of W2, and then taking the average of the third vibration frequencies of the obtained multiple range hoods as I3; by collecting samples of several range hoods with poor consistency, obtaining the fourth vibration frequency of the range hood when the auxiliary fan of each range hood with poor consistency runs at the speed of 0.85*W1 and the main fan runs at the limit speed of 0.9*W2, and then taking the average of the fourth vibration frequencies of the obtained multiple range hoods as I4.

[0152] In this embodiment, since the maximum power of the auxiliary fan is less than the maximum power of the main fan, when the rotational speeds of the auxiliary fan and the main fan change by the same amount, the main fan has a greater impact on the vibration frequency of the range hood. Therefore, when I a ≤△I≤(I a +I b ), it indicates that the vibration frequency of the currently used range hood is larger than that of a normal range hood in the current mode, and the increased amplitude exceeds the amount of the increase in the vibration frequency of the range hood caused by only the loosening of the auxiliary fan, indicating that the main fan must be loose at this time and the auxiliary fan may be loose. When △I>(I a +I b ), it indicates that the vibration frequency of the currently used range hood is larger than that of a normal range hood in the current mode, and the increased amplitude is very large, indicating that both the main fan and the auxiliary fan are very likely to be loose at this time.

[0153] It is found through experiments that the change in the vibration frequency of the range hood is also roughly proportional to the change in the rotational speed of the main fan, and the ratio of the change in the vibration frequency of the range hood to the change in the rotational speed of the auxiliary fan is approximately 10*I b / W2. Therefore, when I a ≤△I≤(I a +I b ), adjust the rotational speed of the main fan from W2 to (W2 - W2*(△I - I a ) / (10*I b ). At the same time, for safety reasons, also lower the rotational speed of the auxiliary fan. Specifically, adjust W1 to 0.8*W1, and the abnormal noise of the range hood can be eliminated.

[0154] When △I > (I a +I b ), it is very likely that both the main fan and the auxiliary fan are loose at this time. For eliminating the abnormal noise of the range hood, theoretically, the lower the rotational speeds of the main fan and the auxiliary fan are, the better. However, the air volume and smoke collection effect of the range hood also need to be considered. Therefore, adjust the rotational speed of the main fan from W2 to 0.9*W2, and adjust the rotational speed of the auxiliary fan from W1 to 0.8*W1. At this time, on the premise of ensuring the air volume and smoke collection effect of the range hood, the lowest critical point for adjusting the abnormal noise has been reached. It can be understood that 0.8*W1 < W1 - △I*W1 / (5*I a ); 0.9*W2 < (W2 - W2*(△I - I a ) / (10*I b )); Therefore, when △I < I a , and when I a ≤△I≤(I a +I b ), the lowest critical point for adjusting the abnormal noise has not been reached.

[0155] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A control method for a range hood, the range hood comprising an auxiliary fan and a main fan, the auxiliary fan being capable of sucking cooking fumes through an auxiliary air inlet, and the main fan being capable of sucking cooking fumes through a main air inlet, characterized in that, The control method of the range hood includes: Obtaining the current oil fume concentration V; Judging the magnitudes of the current oil fume concentration V, the first oil fume concentration V1, and the second oil fume concentration V2, where V2 > V1; If V1 < V < V2, the main fan operates at a set working gear; Determining the theoretical operating power P1 of the main fan based on the set working gear; Obtaining the actual operating power P2 of the main fan; Obtaining the maximum operating power P3 of the auxiliary fan and the maximum air volume X of the auxiliary air inlet; Obtaining the ratio of the change in the air volume ΔX of the main air inlet to the change in the operating power ΔP of the main fan; Determine the operating power P of the auxiliary fan based on P1, P2, P3, X, and △X / △P n ; The auxiliary fan operates at a power of P n and runs.

2. The control method of the range hood according to claim 1, wherein Determine the operating power P of the auxiliary fan based on P1, P2, P3, X, and △X / △P n including: Determine the target operating power P of the auxiliary fan x ; P x = (P1 - P2) * (△X / △P) * (P3 / X) + b; Wherein, ΔX, ΔP, and b are all constants; P n is equal to P x the smaller value of both P and P3.

3. The control method of the range hood according to claim 1, wherein When judging the magnitudes of the current oil fume concentration V, the first oil fume concentration V1, and the second oil fume concentration V2, if V ≤ V1, the required air volume X1 of the auxiliary air inlet is determined based on the current oil fume concentration V; Determine the magnitude of the actual air volume X1 and the preset air volume X n ; If X1 < X n , then turn off the main blower and turn on the auxiliary blower, and adjust the power of the auxiliary blower so that the air volume of the auxiliary air inlet is equal to X1; if X1 ≥ X n , then return to the step of operating the main blower at the set working gear; Among them, when the air volume of the auxiliary air inlet exceeds X n the intensity of the noise generated by the auxiliary air inlet exceeds the set value.

4. The control method of the range hood according to any one of claims 1-3, characterized in that When determining the magnitude relationship between the current oil fume concentration V, the first oil fume concentration V1, and the second oil fume concentration V2, if V ≥ V2, then obtain the actual vibration frequency I of the range hood and calculate the difference △I between the actual vibration frequency I and the set vibration frequency I n of the range hood; Determine the rotational speed W of the auxiliary fan based on the magnitude of △I n and the rotational speed W of the main fan m ; The auxiliary fan runs at a rotational speed of W n and the main fan runs at a rotational speed of W m as well.

5. The control method of the range hood according to claim 4, wherein, Determine the rotational speed W of the auxiliary fan based on the magnitude of △I n and the rotational speed W of the main fan m including: Determine the magnitude of △I and the first set vibration frequency I a ; If △I < I a ; then W n = W1 - △I * W1 / (5 * I a ), W m = W2; W1 is the maximum speed of the auxiliary fan, and W2 is the maximum speed of the main fan.

6. The control method of the range hood according to claim 5, wherein When judging the magnitude of △I and I a If △I ≥ I a , then judge the magnitude of △I and (I a + I b ), where I b is the second set vibration frequency; If I a ≤△I≤(I a +I b ), then W n = 0.8*W1, W m = W2 - W2*(△I - I a ) / (10*I b ).

7. The control method of the range hood according to claim 6, wherein When judging the magnitude of △I and (I a + I b ), if △I > (I a + I b ), then W n = 0.8 * W1, W m = 0.9 * W2.

8. An oil fume suction machine, characterized in that, The range hood includes an auxiliary fan and a main fan. The auxiliary fan can suck oil fume through the auxiliary air inlet, and the main fan can suck oil fume through the main air inlet. The range hood is used to implement the control method of the range hood according to any one of claims 1-7.

9. The range hood according to claim 8, wherein, The range hood further includes: A smoke collecting hood, where both the main air inlet and the auxiliary air inlet are provided on the smoke collecting hood; A main cabinet, which is communicated with the smoke collecting hood. The main fan is installed in the main cabinet. The main fan is provided with a main air duct, an air inlet respectively communicated with the main cabinet and the main air duct, and an exhaust port communicated with the main air duct; An auxiliary air duct, with both ends of the auxiliary air duct respectively communicated with the auxiliary air inlet and the main air duct. The auxiliary fan is arranged in the auxiliary air duct.

10. The range hood according to claim 9, wherein, The range hood further includes a control valve arranged in the auxiliary air duct. The control valve is configured to prevent air flow from flowing from the main air duct to the auxiliary air inlet; and / or, The range hood further includes a smoke deflecting plate, which is movably connected to the smoke collecting hood, and the smoke deflecting plate is used to open or close the main air inlet.

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