Range hood and operation method thereof

Abstract

The invention discloses an extractor hood and an operation method thereof.The extractor hood comprises a smoke collecting shell, a first smoke collecting cavity is formed in the smoke collecting shell, and an opening is formed in the front side of the first smoke collecting cavity; the air inlet housing is mounted in the first smoke collecting cavity, a second smoke collecting cavity communicated with the first smoke collecting cavity is formed in the air inlet housing, the first smoke collecting cavity and the second smoke collecting cavity form a smoke collecting cavity body, a main air inlet communicated with the second smoke collecting cavity is formed in the front side of the air inlet housing, and an auxiliary air inlet communicated with the second smoke collecting cavity is formed in the lower side of the air inlet housing; the upper end of the turning plate is hinged to the upper end of the air inlet housing; the linear driving structure is mounted on the smoke collecting shell and is in transmission connection with the air inlet housing, and the linear driving structure can drive the air inlet housing to move between the stretching-out opening and the retracting-in opening in the front-back direction; and the rotary driving structure is installed on the air inlet housing and is in transmission connection with the turning plate, and the rotary driving structure can drive the turning plate to swing between the position where the main air inlet is closed and the position where the main air inlet is opened.

Description

Technical Field

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

[0002] In recent years, the performance of range hoods has been greatly improved, but in actual use, there is a phenomenon of excess air volume. To solve the problem of excess air volume, the fan speed is generally controlled, that is, when the oil fume concentration is high, the fan is controlled to run at a higher speed, and when the oil fume concentration is low, the fan is controlled to run at a lower speed, or the size of the air inlet is adjusted according to the opening of the flap, thereby adjusting the size of the air inlet. The adjustment speed is slow and it is difficult to match the sudden surge in oil fume concentration during stir-frying.

[0003] Therefore, there is an urgent need for a range hood to solve the above problems. Summary of the invention

[0004] The present invention aims to solve one of the problems existing in the existing related technologies to at least a certain extent. To this end, the present invention provides a range hood that can achieve better adjustment of the air volume according to the concentration of oil smoke.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A range hood, comprising:

[0007] A smoke collecting housing, wherein a first smoke collecting chamber is arranged inside the housing, and an opening is arranged at the front side of the first smoke collecting chamber;

[0008] An air inlet cover is installed in the first smoke collecting chamber, a second smoke collecting chamber connected to the first smoke collecting chamber is provided in the air inlet cover, the first smoke collecting chamber and the second smoke collecting chamber constitute a smoke collecting chamber body, a main air inlet connected to the second smoke collecting chamber is provided on the front side of the air inlet cover, and an auxiliary air inlet connected to the second smoke collecting chamber is provided on the lower side of the air inlet cover;

[0009] A flap, the upper end of which is hinged to the upper end of the air inlet housing;

[0010] A linear drive structure, mounted on the smoke collecting housing and drivingly connected to the air inlet housing, the linear drive structure being capable of driving the air inlet housing to move along a front-to-rear direction between a position extending out of the opening and a position retracted into the opening;

[0011] A rotary drive structure, mounted on the air inlet housing and drivingly connected to the flap, the rotary drive structure being capable of driving the flap to swing between a position of closing the main air inlet and a position of opening the main air inlet;

[0012] The oil fume concentration detector is arranged on the outside of the range hood and is used to detect the oil fume concentration N. The linear drive structure and the rotary drive structure both operate according to the oil fume concentration N.

[0013] Optionally, the auxiliary air inlet is arranged to be inclined downward from front to back.

[0014] Optionally, an oil cup is further included, which is detachably mounted at the bottom end of the opening. When the flap closes the main air inlet, the flap covers the front of the oil cup.

[0015] Optionally, the linear drive structure comprises:

[0016] A linear drive motor is mounted on the inner wall of the smoke collecting housing;

[0017] Two sets of gear rack structures, one set of the gear rack structures is disposed at the left end and the right end of the air inlet housing, the linear drive motor is connected to the gears in the gear rack structures, and the racks of the gear rack structures are mounted on the air inlet housing along the front-rear direction;

[0018] A transmission rod is used to connect the two groups of gears of the gear rack structure.

[0019] Optionally, the rotation drive structure comprises:

[0020] A rotary drive motor is installed in the middle of the air inlet housing;

[0021] A connecting rod structure, one end of which is hinged to the first end of the rotary drive motor, and the other end of which is hinged to the middle part of the rear side of the flap.

[0022] Optionally, an oil net is also provided on the auxiliary air inlet.

[0023] Another aspect of the present invention provides a method for operating the range hood as described above, comprising the following steps:

[0024] S1: Turn on the range hood;

[0025] S2: Open the main air inlet, detect the current oil smoke concentration N, and enter the initial mode;

[0026] The initial mode includes the following steps:

[0027] S10: Determine whether N<N0, if so, proceed to S20, if not, proceed to S50;

[0028] S20: Open the auxiliary air inlet and start timing t01;

[0029] S30: Determine whether t01 = t1, if yes, proceed to S40, if no, repeat S30;

[0030] S40: Determine whether N<N0. If so, close the main air inlet and proceed to S70; if not, directly proceed to S70;

[0031] S50: Determine whether N>N1, if yes, open the auxiliary air inlet and start timing t02, if no, enter S70;

[0032] S60: Determine whether t02=t1, if yes, proceed to S70, if no, repeat S60;

[0033] S70: Determine whether the range hood is turned off, if so, end the program, if not, enter the running mode;

[0034] Among them, N0 is the lowest preset value of the oil fume concentration, N1 is the highest preset value of the oil fume concentration, N0<N1, and t1 is the operating time of the linear drive structure driving the air inlet cover to extend out or retract into the opening.

[0035] Optionally, the operation mode includes the following steps:

[0036] S100: Determine whether N<N0. If so, determine whether I1=0 and I2≠0. If so, open the auxiliary air inlet and start timing t03, then enter S200. If not, enter S500.

[0037] S200: Determine whether t03 = t1, if yes, proceed to S300, if no, repeat S200;

[0038] S300: Determine whether N<N0, if yes, proceed to S400, if no, return to S70;

[0039] S400: close the main air inlet and return to S70;

[0040] S500: Determine whether I1≠0 and I2≠0, if yes, go to S400; if no, return to S70;

[0041] Wherein, I1 is the operating current of the linear drive structure, and I2 is the operating current of the rotary drive structure.

[0042] Optionally, in S100, if N≥N0, proceed to the following steps:

[0043] S101: Determine whether N>N1. If so, determine whether I1=0 and I2≠0. If so, open the auxiliary air inlet and start timing t04, then enter S102. If not, enter S103.

[0044] S102: Determine whether t04 = t1. If so, return to S70; if not, repeat S102.

[0045] S103: Determine whether I1 ≠ 0 and I2 ≠ 0. If so, return to S70; if not, proceed to S400.

[0046] Optionally, in S101, if N1 ≤ N ≤ N0, determine whether I1 = 0 and I2 ≠ 0. If so, return to S70; if not, proceed to the following steps:

[0047] S201: Determine whether I1 ≠ 0 and I2 ≠ 0. If so, close the auxiliary air inlet and return to S70; if not, open the main air inlet and start timing t05.

[0048] S202: Determine whether t05 = t2. If so, proceed to S203; if not, repeat S202.

[0049] S203: Determine whether N < N1. If so, close the auxiliary air inlet and then return to S70; if not, directly return to S70.

[0050] Wherein, t2 is the running duration for the rotary drive structure to drive the flap to close or open the main air inlet.

[0051] Compared with the prior art, the present invention has at least the following beneficial effects:

[0052] The range hood provided by the present invention is provided with a main air inlet and an auxiliary air inlet on the air inlet hood shell, and a linear drive structure is used to control the opening and closing of the auxiliary air inlet, a rotary drive structure is used to control the opening and closing of the main air inlet, and an oil fume concentration detector is used to detect the oil fume concentration N in the cooking chamber. Furthermore, the linear drive structure and the rotary drive structure can move according to the oil fume concentration N, and then adjust the opening and closing of the auxiliary air inlet and the main air inlet, so as to realize the adjustment of the air inlet area of the range hood, and further realize the adjustment of the air inlet volume. Specifically, when N < N0, only the auxiliary air inlet is opened; when N0 < N < N1, only the main air inlet is opened; when N1 < N, both the main air inlet and the auxiliary air inlet are opened, so that the air inlet volume matches the oil fume concentration N, and further achieve the effects of energy saving and high efficiency, and solve the problem of excessive air volume existing in the range hood in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a three - dimensional structural schematic diagram of the range hood provided by a specific embodiment of the present invention (both the main air inlet and the auxiliary air inlet are closed);

[0054] Figure 2 is a three - dimensional structural schematic diagram of the range hood provided by a specific embodiment of the present invention (both the main air inlet and the auxiliary air inlet are opened);

[0055] Figure 3 yes Figure 2 One of the cross-sectional structural diagrams;

[0056] Figure 4 yes Figure 2 The second schematic diagram of the cross-sectional structure;

[0057] Figure 5 is a schematic diagram of the three-dimensional structure of a range hood provided by a specific embodiment of the present invention (the main air inlet is closed and the auxiliary air inlet is opened);

[0058] Figure 6 is a schematic diagram of the three-dimensional structure of a range hood provided by a specific embodiment of the present invention (the main air inlet is open and the auxiliary air inlet is closed);

[0059] Figure 7 It is a schematic diagram of the operating steps of the range hood provided by a specific embodiment of the present invention.

[0060] In the figure:

[0061] 1. Smoke collecting housing; 10. Opening;

[0062] 2. Air inlet cover;

[0063] 3. Flip board;

[0064] 4. Casing;

[0065] 5. Oil fume concentration detector;

[0066] 6. Oil cup;

[0067] 7. Linear drive structure; 71. Linear drive motor; 72. Gear rack structure; 73. Transmission rod;

[0068] 8. Rotation drive structure; 81. Rotation drive motor; 82. Connecting rod structure;

[0069] 9. Fan;

[0070] 101. Main air inlet; 102. Auxiliary air inlet;

[0071] 201. First smoke collecting chamber; 202. Second smoke collecting chamber; 200. Smoke collecting chamber body. DETAILED DESCRIPTION

[0072] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed by the present invention.

[0073] Please refer to Figure 1-Figure 6 According to the present invention, there is provided a range hood, which includes a smoke collecting outer shell 1, an air inlet hood 2, a flap 3, a linear drive structure 7 and a rotary drive structure 8. A first smoke collecting cavity 201 is arranged inside the smoke collecting outer shell 1, and an opening 10 is arranged on the front side of the first smoke collecting cavity 201. The air inlet hood 2 is installed in the first smoke collecting cavity 201, and a second smoke collecting cavity 202 communicating with the first smoke collecting cavity 201 is formed inside the air inlet hood 2. The first smoke collecting cavity 201 and the second smoke collecting cavity 202 form a smoke collecting cavity 200. A main air inlet 101 communicating with the second smoke collecting cavity 202 is arranged on the front side of the air inlet hood 2, and an auxiliary air inlet 102 communicating with the second smoke collecting cavity 202 is arranged on the lower side of the air inlet hood 2. The upper end of the flap 3 is hinged to the upper end of the air inlet hood 2. The linear drive structure 7 is installed on the smoke collecting outer shell 1 and is in transmission connection with the air inlet hood 2. The linear drive structure 7 can drive the air inlet hood 2 to move between a position extending out of the opening 10 and a position retracting into the opening 10 in the front-rear direction. The rotary drive structure 8 is installed on the air inlet hood 2 and is in transmission connection with the flap 3. The rotary drive structure 8 can drive the flap 3 to swing between a position closing the main air inlet 101 and a position opening the main air inlet 101. A smoke concentration detector 5 is arranged on the outer side of the range hood for detecting the smoke concentration N. Both the linear drive structure 7 and the rotary drive structure 8 operate according to the smoke concentration N.

[0074] The range hood provided by the present invention is provided with a main air inlet 101 and an auxiliary air inlet 102 on the air inlet hood 2, and the opening and closing of the auxiliary air inlet 102 is controlled by the linear drive structure 7, the opening and closing of the main air inlet 101 is controlled by the rotary drive structure 8, and the smoke concentration detector 5 is used to detect the smoke concentration N in the cooking chamber. Furthermore, the linear drive structure 7 and the rotary drive structure 8 can move according to the smoke concentration N, and then the opening and closing of the auxiliary air inlet 102 and the main air inlet 101 are adjusted, so as to realize the adjustment of the air inlet area of the range hood, and further realize the adjustment of the air inlet volume. Specifically, when N < N0, as shown in Figure 5 , only the auxiliary air inlet 102 is opened. When N0 < N < N1, as shown in Figure 6 , only the main air inlet 101 is opened. When N1 < N, as shown in Figure 2 and Figure 3 and Figure 4 , the main air inlet 101 and the auxiliary air inlet 102 are opened simultaneously, and the smoke collecting range is further expanded, which is beneficial to preventing the escape of oil fume, so that the air inlet volume matches the smoke concentration N, and further achieves the effects of energy saving and high efficiency, and solves the problem of excessive air volume existing in the range hood in the prior art. Among them, N0 is the lowest preset value of the smoke concentration, N1 is the highest preset value of the smoke concentration, and N0 < N1.

[0075] Optionally, the auxiliary air inlet 102 is tilted downward from front to back so that the oil can flow along the auxiliary air inlet 102 from front to back to the inside of the smoke collecting housing 1 to prevent the oil from dripping onto the stove.

[0076] Optionally, it also includes an oil cup 6, which is detachably mounted at the bottom end of the opening 10. When the flap 3 closes the main air inlet 101, the flap 3 covers the front of the oil cup 6. The oil cup 6 is used to receive the oil stains on the air inlet cover 2. Since the flap 3 can be positioned in front of the oil cup 6 when the main air inlet 101 is closed, the oil cup 6 is hidden when the range hood is turned off, thereby achieving an aesthetic effect.

[0077] Optionally, the linear drive structure 7 includes a linear drive motor 71, two sets of gear rack structures 72 and a transmission rod 73. The linear drive motor 71 is mounted on the inner wall of the smoke collecting housing 1. A set of gear rack structures 72 are provided at the left and right ends of the air inlet housing 2, and the linear drive motor 71 is connected to the gears in the gear rack structure 72 by transmission, and the racks of the gear rack structure 72 are installed on the air inlet housing 2 along the front-to-back direction. The gears of the two sets of gear rack structures 72 are connected by a transmission rod 73, thereby realizing stable driving of the air inlet housing 2.

[0078] Optionally, the rotation drive structure 8 includes a rotation drive motor 81 and a connecting rod structure 82. The rotation drive motor 81 is installed in the middle of the air inlet housing 2. One end of the connecting rod structure 82 is hinged to the first end of the rotation drive motor 81, and the other end is hinged to the middle of the rear side of the flap 3, so as to achieve stable driving of the flap 3.

[0079] It should be noted that the connecting rod structure 82 is a prior art and will not be described in detail here.

[0080] Optionally, an oil net is also provided on the auxiliary air inlet 102 to filter out oil stains.

[0081] Optionally, the oil fume concentration detector 5 is a PM2.5 module, which is used to detect PM2.5 data in the air. The more PM2.5 in the air, the higher the oil fume concentration.

[0082] Optionally, it further includes a chassis and a fan 9 arranged in the chassis. The chassis is installed on the upper side of the smoke collecting housing 1 and is connected to the smoke collecting cavity 200 .

[0083] Optionally, a PM2.5 module is mounted on the lower side of the front of the chassis.

[0084] Please refer to Figure 7 Another aspect of the present invention provides a method for operating the range hood as described above, comprising the following steps:

[0085] S1: Turn on the range hood;

[0086] S2: Open the main air inlet 101, detect the current oil smoke concentration N, and enter the initial mode;

[0087] The initialization mode includes the following steps:

[0088] S10: Determine whether N<N0, if so, proceed to S20, if not, proceed to S50;

[0089] S20: Open the auxiliary air inlet 102 and start timing t01;

[0090] S30: Determine whether t01 = t1, if yes, proceed to S40, if no, repeat S30, so as to prevent the auxiliary air inlet 102 from closing before being fully opened;

[0091] S40: Determine whether N<N0. If so, close the main air inlet 101 and enter S70; if not, keep both the main air inlet 101 and the auxiliary air inlet 102 open and directly enter S70, so as to prevent the auxiliary air inlet 102 from being frequently opened and closed.

[0092] S50: Determine whether N>N1. If so, open the auxiliary air inlet 102 and start timing t02. If not, keep the main air inlet 101 open and directly enter S70.

[0093] S60: Determine whether t02 = t1, if yes, proceed to S70, if no, repeat S60 to prevent the auxiliary air inlet 102 from closing before being fully opened;

[0094] S70: Determine whether the range hood is turned off, if so, end the program, if not, enter the running mode;

[0095] Here, t1 is the running time of the linear drive structure 7 driving the air inlet cover 2 to extend out of or retract into the opening 10 .

[0096] Optionally, the operation mode includes the following steps:

[0097] S100: Determine whether N<N0. If so, determine whether I1=0 and I2≠0. If so, open the auxiliary air inlet 102 and start timing t03, then enter S200. If not, enter S500.

[0098] S200: Determine whether t03 = t1, if yes, enter S300, if no, repeat S200 to ensure that the auxiliary air inlet 102 is completely opened before closing the main air inlet 101, so as to ensure that at least one of the main air inlet 101 and the auxiliary air inlet 102 is in an open state, thereby ensuring the air intake effect;

[0099] S300: Determine whether N<N0, if yes, proceed to S400, if no, return to S70;

[0100] S400: close the main air inlet 101 and return to S70;

[0101] S500: Determine whether I1≠0 and I2≠0. If so, proceed to S400; if not, keep the auxiliary air inlet 102 open and directly return to S70;

[0102] Wherein, I1 is the operating current of the linear drive structure 7 , and I2 is the operating current of the rotary drive structure 8 .

[0103] Optionally, in S100, if N≥N0, proceed to the following steps:

[0104] S101: Determine whether N>N1. If so, determine whether I1=0 and I2≠0. If so, open the auxiliary air inlet 102 and start timing t04, then enter S102. If not, enter S103.

[0105] S102: Determine whether t04 = t1, if yes, return to S70, if no, repeat S102, so as to prevent the auxiliary air inlet 102 from closing before being fully opened;

[0106] S103: Determine whether I1≠0 and I2≠0. If so, keep the main air inlet 101 and the auxiliary air inlet 102 open at the same time and return to S70. If not, enter S400.

[0107] Optionally, in S101, if N1≤N≤N0, determine whether I1=0 and I2≠0. If so, keep the main air inlet 101 open and return to S70. If not, proceed to the following steps:

[0108] S201: Determine whether I1≠0 and I2≠0. If so, close the auxiliary air inlet 102 and return to S70. If not, open the main air inlet 101 and start timing t05.

[0109] S202: Determine whether t05 = t2, if yes, proceed to S203, if no, repeat S202 to prevent the main air inlet 101 from closing before it is fully opened;

[0110] S203: Determine whether N<N1. If so, close the auxiliary air inlet 102 and return to S70 to prevent the main air inlet 101 from being frequently opened and closed. If not, keep both the main air inlet 101 and the auxiliary air inlet 102 open and return directly to S70.

[0111] Here, t2 is the operating time of the rotary drive structure 8 driving the flap 3 to close or open the main air inlet 101 .

[0112] Optionally, in S2, detecting the current oil smoke concentration N specifically includes the following steps:

[0113] The PM2.5 module detects the PM2.5 value in the air every 1 second, calculates the average value of PM2.5 detected within 5 seconds, and thus obtains the oil fume concentration N.

[0114] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A range hood, characterized in that: include: A smoke collecting housing (1), wherein a first smoke collecting chamber (201) is arranged inside the housing, and an opening (10) is arranged at the front side of the first smoke collecting chamber (201); An air inlet cover (2) is installed in the first smoke collecting chamber (201); a second smoke collecting chamber (202) communicating with the first smoke collecting chamber (201) is provided in the air inlet cover (2); the first smoke collecting chamber (201) and the second smoke collecting chamber (202) constitute a smoke collecting chamber body (200); a main air inlet (101) communicating with the second smoke collecting chamber (202) is provided on the front side of the air inlet cover (2); an auxiliary air inlet (102) communicating with the second smoke collecting chamber (202) is provided on the lower side of the air inlet cover (2); A flap (3), the upper end of which is hinged to the upper end of the air inlet housing (2); A linear drive structure (7) is mounted on the smoke collecting housing (1) and is in driving connection with the air inlet housing (2), wherein the linear drive structure (7) is capable of driving the air inlet housing (2) to move along a front-to-rear direction between a position extending out of the opening (10) and a position retracted into the opening (10); a rotary drive structure (8) mounted on the air inlet housing (2) and in driving connection with the flap (3), wherein the rotary drive structure (8) is capable of driving the flap (3) to swing between a position of closing the main air inlet (101) and a position of opening the main air inlet (101); The oil fume concentration detector (5) is arranged on the outside of the range hood and is used to detect the oil fume concentration N. The linear drive structure (7) and the rotary drive structure (8) both operate according to the oil fume concentration N.

2. The range hood according to claim 1, characterized in that: The auxiliary air inlet (102) is arranged to be inclined downward from front to back.

3. The range hood according to claim 1, characterized in that: It also includes an oil cup (6), which is detachably mounted on the bottom end of the opening (10); when the flap (3) closes the main air inlet (101), the flap (3) covers the front of the oil cup (6).

4. The range hood according to claim 1, characterized in that: The linear drive structure (7) comprises: A linear drive motor (71) mounted on the inner wall of the smoke collecting housing (1); Two sets of gear rack structures (72), one set of the gear rack structures (72) being provided at the left end and the right end of the air inlet housing (2), the linear drive motor (71) being transmission-connected to a gear in the gear rack structure (72), the rack of the gear rack structure (72) being mounted on the air inlet housing (2) along the front-rear direction; A transmission rod (73), through which the gears of the two sets of gear rack structures (72) are connected.

5. The range hood according to claim 1, characterized in that: The rotary drive structure (8) comprises: A rotary drive motor (81) mounted in the middle of the air inlet housing (2); A connecting rod structure (82) has one end hinged to the first end of the rotary drive motor (81), and the other end hinged to the middle of the rear side of the flap (3).

6. The range hood according to any one of claims 1 to 5, characterized in that: An oil net is also provided on the auxiliary air inlet (102).

7. A method for operating a range hood according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Turn on the range hood; S2: Open the main air inlet, detect the current oil smoke concentration N, and enter the initial mode; The initial mode includes the following steps: S10: Determine whether N<N0, if yes, go to S20, if no, go to S50; S20: opening the auxiliary air inlet (102) and starting time t01; S30: Determine whether t01 = t1, if yes, proceed to S40, if no, repeat S30; S40: Determine whether N<N0. If so, close the main air inlet (101) and enter S70; if not, directly enter S70; S50: Determine whether N>N1, if yes, open the auxiliary air inlet (102) and start timing t02, if no, enter S70; S60: Determine whether t02=t1, if yes, proceed to S70, if no, repeat S60; S70: Determine whether the range hood is turned off, if so, end the program, if not, enter the running mode; Wherein, N0 is the lowest preset value of the oil fume concentration, N1 is the highest preset value of the oil fume concentration, N0<N1, and t1 is the operating time of the linear drive structure (7) driving the air inlet cover (2) to extend out or retract into the opening (10).

8. The method for operating a range hood according to claim 7, characterized in that: The operation mode comprises the following steps: S100: Determine whether N<N0. If so, determine whether I1=0 and I2≠0. If so, open the auxiliary air inlet and start timing t03, then enter S200. If not, enter S500. S200: Determine whether t03 = t1, if yes, proceed to S300, if no, repeat S200; S300: Determine whether N<N0, if yes, proceed to S400, if no, return to S70; S400: close the main air inlet and return to S70; S500: Determine whether I1≠0 and I2≠0, if yes, go to S400; if no, return to S70; Wherein, I1 is the operating current of the linear drive structure (7), and I2 is the operating current of the rotary drive structure (8).

9. The method for operating a range hood according to claim 8, characterized in that: In S100, if N ≥ N0, the following steps are performed: S101: Determine whether N>N1. If so, determine whether I1=0 and I2≠0. If so, open the auxiliary air inlet and start timing t04, then enter S102. If not, enter S103. S102: Determine whether t04=t1, if yes, return to S70, if no, repeat S102; S103: Determine whether I1≠0 and I2≠0, if so, return to S70, if not, enter S400.

10. The method for operating a range hood according to claim 9, characterized in that: In S101, if N1≤N≤N0, determine whether I1=0 and I2≠0. If so, return to S70. If not, proceed to the following steps: S201: Determine whether I1≠0 and I2≠0. If so, close the auxiliary air inlet and return to S70. If not, open the main air inlet and start timing t05. S202: Determine whether t05=t2, if yes, proceed to S203, if no, repeat S202; S203: Determine whether N<N1. If so, close the auxiliary air inlet and return to S70. If not, directly return to S70. Wherein, t2 is the operating time of the rotary drive structure (8) driving the flap (3) to close or open the main air inlet (101).

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