Range hood and control method thereof

Abstract

The present invention discloses a range hood and a control method thereof. The range hood includes a power device for installation above a suspended ceiling, the power device including a fan frame and a fan disposed within the fan frame, the fan being arranged horizontally and including a downwardly facing air inlet. The fan is rotatably connected to the fan frame, allowing the fan to rotate about an axis extending forward and backward, thereby changing the angle of the air inlet relative to a horizontal plane. Compared with the prior art, the present invention has the advantages of: in a compact space, by enabling the fan to rotate, the front and rear air inlet flow rate distribution and angle adjustment can be performed based on the inlet flow rate and operating noise, thereby catering to the angle at which oil smoke enters the air inlet, ensuring maximum air volume (effective air volume), the highest inlet flow rate, and an outward expansion of the overall negative pressure zone, thereby providing an ultimate experience in oil smoke extraction effect and noise level.

Description

Technical Field

[0001] The present 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 an indispensable kitchen appliance in modern homes. They operate based on the principles of fluid dynamics, using a centrifugal fan installed inside the hood to draw in and exhaust cooking fumes, while a filter removes some grease particles. A centrifugal fan consists of a volute, an impeller mounted within the volute, and a motor that drives the impeller. As the impeller rotates, negative pressure is generated at the fan's center, drawing cooking fumes from beneath the hood into the fan. After being accelerated by the fan, the volute collects them and guides them out of the room.

[0003] The fan is the core power system of the range hood and is generally fixed to the top rear panel of the casing or the fan frame assembly. The aerodynamic noise of the fan is the main noise source of the range hood. Its distance from the user will greatly affect the user experience. In order to reduce noise, some split range hoods place the fan on top or in the exhaust duct section, such as the range hood and oil fume purification system disclosed in Chinese patent application number 201821517326.1. The range hood includes a fume hood, a centrifugal fan and a guide channel located between the two. The centrifugal fan is located at the top of the range hood and is arranged so that the axis of its impeller is in the vertical direction and is located above the ceiling. The inlet of the guide channel is connected to the fume hood, and the outlet is opposite to the fan inlet of the centrifugal fan, and the fan inlet faces downward.

[0004] This solution of placing the fan above the ceiling has high requirements for installation space. Once installed, the fan is usually fixed and the speed can only be adjusted according to factors such as resistance. The posture and flow distribution cannot be adjusted according to the inlet flow rate, etc., and the desired air volume and inlet flow rate cannot be ensured. As a result, the oil fume extraction effect cannot meet the needs and needs further improvement. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a range hood in response to the deficiencies in the above-mentioned prior art, which can increase the effective air volume and inlet flow rate, and can also expand the overall negative pressure area outward.

[0006] The second technical problem to be solved by the present invention is to provide a control method for the range hood.

[0007] The present invention solves the first technical problem by adopting a technical solution: a range hood, comprising a power device for installation above a suspended ceiling, the power device comprising a fan frame and a fan disposed in the fan frame, the fan being arranged horizontally and comprising a downwardly facing air inlet; the characteristics of the present invention are:

[0008] The fan is rotatably connected to the fan frame so that the fan can rotate around an axis extending forward and backward, thereby changing the angle of the air inlet relative to the horizontal plane.

[0009] In a compact space, the fan is made rotatable so that the front and rear air flow rates can be distributed and the angle can be adjusted according to the inlet flow rate and working noise, catering to the angle of oil smoke entering the air inlet, ensuring the maximum air volume (effective air volume) and the highest inlet flow rate. The overall negative pressure area expands outward, satisfying the ultimate experience of oil smoke suction effect and noise value.

[0010] Preferably, in order to facilitate the fan to remain stable during rotation, the fan further includes an air outlet, and the fan is rotatably connected to the fan frame at the air outlet.

[0011] In order to facilitate the fan to discharge oil smoke, a mounting port is opened on the side of the fan frame, and an air outlet cover is fixed at the air outlet of the fan. The air outlet cover is inserted into the fan frame through the mounting port and is fixedly connected to the fan.

[0012] In order to avoid pressure relief at the mounting port when the fan rotates, the upper edge or lower edge of the air outlet of the fan or the air outlet cover located inside the fan frame is rotatably connected to the fan frame, and the other edges of the air outlet or the air outlet cover located inside the fan frame are connected to the fan frame through a flexible member, and the flexible member isolates the mounting port from the interior of the fan frame.

[0013] Preferably, the fan includes a volute and an impeller disposed in the volute, the volute includes a front cover plate, a rear cover plate spaced above the front cover plate, and an annular wall located between the front cover plate and the rear cover plate, the air inlet is formed on the front cover plate, and the front cover plate, the rear cover plate, and the annular wall together form the air outlet;

[0014] When the fan is in the initial position, the axis extends in the vertical direction, and the air inlet is horizontal. The lowest point of the outlet of the air outlet cover is higher than the inner surface of the front cover of the volute, thereby ensuring that oil droplets flow back into the volute during operation.

[0015] Furthermore, a connecting ring for connecting to an external smoke exhaust pipe is connected to the outlet of the air outlet hood, and the connecting ring gradually tilts upward from the connection with the air outlet hood toward the direction away from the air outlet hood, thereby ensuring that the condensed oil at the smoke exhaust pipe returns to the inside of the volute.

[0016] To facilitate the discharge of oil and dirt in the volute, the fan includes a volute, the air inlet is formed on the volute, and the range hood also includes an oil drain pipe, one end of the oil drain pipe is fixed to the volute, and the other end of the oil drain pipe is a free end and is located in the fan frame.

[0017] Furthermore, in order to make the oil discharge position at the lower position of the volute, an air outlet is formed on the volute, the fan is rotatably connected to the fan frame at the air outlet, and the oil discharge pipe is fixed at a position of the volute away from the air outlet.

[0018] In order to prevent oil from leaking from the air inlet ring, an air inlet ring is provided at the air inlet of the volute, and the fixed position of the oil drain pipe and the volute is lower than the upper edge of the air inlet ring.

[0019] In order to facilitate the stable driving of the fan to rotate, the range hood also includes a motion mechanism for driving the fan to rotate, the motion mechanism includes a driving mechanism and a transmission mechanism for transmitting the output of the driving mechanism to the fan, the transmission mechanism includes an active end and a driven end respectively located on the front and rear sides of the fan, and the active end is connected to the driving mechanism.

[0020] To facilitate the control of fan rotation, the range hood further includes a connecting pipe and an air inlet assembly. The connecting pipe is connected between the fan frame and the air inlet assembly. An inlet for oil smoke to enter is formed at the bottom of the fan frame, and a wind speed sensor is provided at the inlet. A sound sensor is provided in the connecting pipe or the air inlet assembly.

[0021] The technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood as described above, characterized in that it includes the following steps:

[0022] S1) Turn on the range hood;

[0023] S2) selecting a gear, selecting the following gears: first gear, second gear, and third gear, wherein the first gear is greater than the second gear, and the third gear is automatic; the fan returns to the initial state, being arranged horizontally; when the selected gear is the third gear, proceeding to step S3);

[0024] S3) Increase the fan speed and maintain it for a certain period of time;

[0025] S4) Read the current wind speed v collected by the wind speed sensor = v o And the current noise value L=L0 collected by the sound sensor, the fan attitude adjustment count c=0;

[0026] S5) determining whether L0 < N1 holds true, where N1 is a preset noise threshold; if so, proceeding to step S6); if not, reducing the fan speed and returning to step S4);

[0027] S6) Determine v o >Whether N2 is established, where N2 is a preset wind speed threshold. If so, proceed to step S7);

[0028] S7) The fan is rotated downward by a certain angle, and after a certain delay, the sound sensor collects the current noise value L0 again, and sets c=c+1;

[0029] S8) determining whether L0 < N1 and c < N3 are satisfied, where N3 is a preset number threshold; if so, returning to step S7); if not, setting the total fan operation time t0 = t + t0, and proceeding to step S9);

[0030] S9) The fan maintains the current inclination angle for a period of time and then turns off.

[0031] Furthermore, in order to facilitate the discharge of oil stains in the fan when a large amount of oil stains accumulate after the fan has been operating for a certain period of time, and to solve the problems of oil dripping and dripping through (oil droplets drip from the air inlet of the range hood onto the countertop or pot due to multiple factors such as condensation and airflow), the fan includes a volute, the air outlet is formed on the volute, and the range hood also includes a timer and an oil drain pipe, one end of the oil drain pipe is fixed to a position of the volute away from the air outlet, and the other end of the oil drain pipe is a free end and is located in the fan frame;

[0032] Before step S1), a timer is initialized. In step S1), the timer starts timing. In step S8), if no, the total time of the fan operation is set to t0=t+t0, where t is the current fan operation time, and then the process proceeds to step S9). After step S9), the process also includes the following steps:

[0033] S10) Determine whether t0>N4 is established, where N4 is a preset operating time threshold. If so, drive the fan downward to the limit position, and the fan drains oil through the oil drain pipe. Then set t0=0, latch t0, and end; if not, latch t0, and end.

[0034] Furthermore, in step S6), if not, it is prompted that the flue or smoke pipe is abnormal, and the total time of the fan operation is set to t0=t+t0, and step S9 is entered to eliminate the abnormality causing excessive resistance.

[0035] Further, in step S2), when the selected gear is the first gear, the total time the fan runs is set to t0 = m*t + t0, and the process proceeds to step S9); if not, the total time the fan runs is set to t0 = n*t + t0, and the process proceeds to step S9), where m and n are constant coefficients, and 1>m>n>0, thereby converting different amounts of oil accumulation according to different gears.

[0036] Compared with the prior art, the advantages of the present invention are: 1) in a compact space, by making the fan rotatable, the front and rear air flow rates are distributed and the angle is adjusted according to the inlet flow rate and working noise, so as to cater to the angle of the oil smoke entering the air inlet, ensure the maximum air volume (effective air volume), the highest inlet flow rate, and the outward expansion of the overall negative pressure area, so as to meet the ultimate experience of oil smoke absorption effect and noise value; 2) by setting an oil drain pipe, it is possible to enter the oil drain mode, so as to facilitate the discharge of oil stains in the fan when a lot of oil stains accumulate after the fan has been working for a certain period of time, and solve the problems of oil dripping and dripping (oil droplets drip from the air inlet of the range hood to the countertop or pot due to multiple factors such as condensation and airflow). BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of a range hood according to an embodiment of the present invention;

[0038] Figure 2 This is a cross-sectional view (left-right cross-section) of a range hood with hidden connecting ducts and an air inlet assembly according to an embodiment of the present invention;

[0039] Figure 3 This is a cross-sectional view (front-to-back cross-section) of a range hood with hidden connecting pipes, air inlet components, and oil drain pipes according to an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the exploded structure of the hidden connecting pipe, air inlet assembly and connecting ring of the range hood according to an embodiment of the present invention;

[0041] Figure 5 is a schematic diagram of a motion mechanism of a range hood according to an embodiment of the present invention;

[0042] Figure 6 This is a cross-sectional view of the range hood with hidden connecting ducts and air inlet components (left-right cross-section, initial state) according to an embodiment of the present invention;

[0043] Figure 7 This is a flow chart of a control method for a range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] 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.

[0045] 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0046] See also Figure 1 and Figure 2 A range hood includes a power device 1, a connecting pipe 2 and an air intake assembly 3, wherein the power device 1 is arranged above the kitchen ceiling, the air intake assembly 1 is used to inhale oil smoke, and its specific air intake form is not limited, and the connecting pipe 2 is connected between the power device 1 and the air intake assembly 3.

[0047] The power unit 1 includes a fan frame 11 and a fan 12 disposed within the fan frame 11. In this embodiment, the fan 12 is a centrifugal fan, comprising a volute 121, an impeller 122 disposed within the volute 121, and a motor 123 for driving the impeller 122. The volute 121 is formed with an air inlet 1211 and an air outlet 1212. The fan 12 is arranged horizontally, i.e., the axis of the fan 12 extends vertically (in the initial state, a certain inclination relative to the vertical direction is permitted after adjustment), the air inlet 1211 faces downward, and the air outlet 1212 faces left or right.

[0048] See also Figures 2 to 5 The volute 121 includes a front cover plate 1215, a rear cover plate 1216 spaced apart above the front cover plate 1215, and an annular wall 1217 located between the front cover plate 1215 and the rear cover plate 1216. The air inlet 1211 is formed on the front cover plate 1215, while the front cover plate 1215, the rear cover plate 1216, and the annular wall 1217 collectively form the air outlet 1212. An air inlet ring 1218 is provided at the air inlet 1211. The structure of the volute 121 can adopt existing technology.

[0049] The range hood further comprises an oil drain pipe 6, one end of which is fixed to the annular wall 1217 of the volute 121 and fixed to a side of the annular wall 1217 away from the air outlet 1212. Figure 2As shown in the figure, the oil drain pipe 6 is fixed to the right side of the annular wall 1217 (the user's left side), while the air outlet 1211 is formed on the left side (the user's right side). The oil drain pipe 6 and the annular wall 1217 are fixed at a position lower than the upper edge of the air inlet ring 1218, thereby preventing excessive oil accumulation from leaking out of the air inlet 1211. The oil drain pipe 6 is curved, with its other end being free, representing the lowest point of the oil drain pipe 6, and can be suspended within the fan frame 11.

[0050] The range hood also includes an air outlet cover 4, which is used to be fixed to the air outlet 1212 of the fan 12 so that the fan 12 can exhaust the oil smoke through the air outlet cover 4. Figure 1 As shown on the right side, Figure 2 A mounting opening 111 is provided on the left side of the fan housing 11 (as shown). The air hood 4 extends from the mounting opening 111 into the fan frame 11 and is connected to the fan 12. A connecting ring 7 is connected to the outlet of the air hood 4, which is used to connect to an external exhaust pipe. The air hood 4 and the connecting ring 7 are tightened together by a screw cap 41. The connecting ring 7 is slightly tilted upward, that is, it gradually tilts upward from the connection with the air hood 4 in a direction away from the air hood 4, thereby ensuring that the condensed oil in the exhaust pipe can flow back into the volute 121.

[0051] The fan 12 can rotate relative to the fan frame 11 about an axis extending forward and backward. A flange 14 is provided at the air outlet 1212 of the volute 121. The flange 14 is annular in shape, matching the air outlet 1212, with a rectangular or square outer edge. To facilitate the rotation of the fan 12, the bottom edge of the flange 14 is rotatably connected to the fan frame 11 via a hinge 16 or other device, with the connection position no higher than the lower edge of the mounting opening 111. The rest of the flange 14 is connected to corresponding positions on the fan frame 11 via a flexible member 15. In this embodiment, the front and rear edges of the flange 14 are respectively connected to the side walls of the fan frame 11 (the side walls through which the air outlet hood 4 passes), while the top edge of the flange 14 is connected to the top of the fan frame 11 or to a side wall no lower than the upper edge of the mounting opening 111. The flexible member 15 covers the mounting opening 111. The flexible member 15 can be a felt roller blind assembly (i.e., a felt curtain that can be rolled and unrolled) or a retractable component. Please refer to the Chinese patent application number 201910886712.0 of the present applicant, in which the annular wall extension section is equivalent to the flexible member 15 of the present application (only the connection method is different), thereby preventing the air outlet hood 4 from rotating with the fan 12 and forming a gap between the air outlet hood 4 and the mounting port 111, resulting in pressure relief at the mounting port 111. Alternatively, the above-mentioned flexible member 15 can also be connected between the portion of the air outlet hood 4 located inside the wind frame 11 and the wind frame 11, as long as the mounting port 111 and the space inside the wind frame 11 can be isolated. Alternatively, the flange 14 can also be rotatably connected to the wind frame 11 at the top edge. In this case, the connection position of the flexible member 15 can be changed accordingly, that is, the original top edge connection position is replaced with a connection between the bottom edge and the corresponding position of the wind frame 11.

[0052] In order to facilitate the driving of the fan 12 to rotate, the range hood also includes a motion mechanism, which includes a driving mechanism 51 and a transmission mechanism, wherein the driving mechanism 51 is preferably a motor, and the transmission mechanism includes an active end and a driven end. A first bracket 1213 is provided on the rear side of the upper part of the volute 121, and a second bracket 1214 is provided on the front side. The active end is connected to the first bracket 1213, and the driven end is connected to the second bracket 1214. The active end includes a first connecting rod 521, a second connecting rod 522, a first rocker arm 523, and a first support 524. The first support 524 is fixed to the top of the fan frame 11. The drive mechanism 51 is disposed on the first support 524. The first connecting rod 521 is fixed to the output shaft 511 of the drive mechanism 51 (or is otherwise connected in a transmission manner), thereby being able to rotate with the output shaft 511. The rotation axis extends in the front-to-back direction. The first connecting rod 521 is also rotationally connected to one end of the second connecting rod 522. The other end of the second connecting rod 522 is rotationally connected to the first rocker arm 523. One end of the first rocker arm 523 is rotationally connected to the first support 524 and the other end is fixed to the first bracket 1213. The second connecting rod 522 is connected between the two ends of the first rocker arm 523. In this way, the fan 12 can be driven to rotate by the drive mechanism 51. The driven end includes a second rocker 525 and a second support 526. The second support 526 is fixed to the top of the fan frame 11. One end of the second rocker 525 is rotatably connected to the second support 526, and the other end is fixed to the second bracket 1214, ensuring synchronous and stable rotation of the front and rear sides of the fan 12. The rotation axes of the first connecting rod 521, the second connecting rod 522, the first rocker 523, and the second rocker 525 all extend in the front-to-back direction.

[0053] The driving mechanism 51 may also be an electric push rod, and the transmission mechanism 52 may also be other existing mechanisms, such as a synchronization shaft extending forward and backward, which is driven to rotate by a motor or an electric push rod, such as a gear set, which is driven by a motor, and so on.

[0054] The bottom of the fan frame 11 forms an inlet for oil smoke to enter. A wind speed sensor 81 can be set at the inlet at the bottom of the fan frame 11, and a sound sensor 82 is set at the lower end of the connecting pipe 2 or the upper end of the air inlet component 3. The sound sensor 82 can preferably be a microphone ( Figure 1 (shown by dotted lines in the figure, and placed in the flue inside the range hood).

[0055] See also Figure 6 When the fan 12 is in the initial position, its axis extends in the vertical direction, and the lowest point of the outlet of the air hood 4 is higher than the inner surface of the front cover 1215 of the volute 121, ensuring that the oil droplets flow back into the volute 121 during operation.

[0056] See also Figure 7 The control method of the range hood of the present invention comprises the following steps:

[0057] 1) Start by initializing the timer to 0; the timer is usually located in the main control module of the range hood (not shown in the drawings);

[0058] 2) The range hood is turned on and the timer starts counting in seconds;

[0059] 3) The range hood is selected from the following gears: first gear q (strong gear), second gear r (weak gear) and third gear z (automatic gear);

[0060] 4) The driving mechanism 51 rotates in the opposite direction to the limit position, so that the volute 121 returns to the initial state and is arranged horizontally;

[0061] 5) Determine whether the current gear is the third gear z, if yes, proceed to step 6), if no, proceed to step 18);

[0062] 6) The speed of the motor 13 is increased to a speed higher than the third gear z, such as 1300 rpm, and maintained for a certain time, such as 30 seconds;

[0063] 7) Read the current wind speed v collected by the wind speed sensor 81 = v o (m / s), and the current noise value L=L0 (dBA) collected by the sound sensor 82, so that the fan 12 posture adjustment count c=0;

[0064] 8) Determine whether L0 < N1, where N1 is a preset noise threshold, such as N1 = 58 in this embodiment. If yes, proceed to step 9); if not, proceed to step 17);

[0065] 9) Determine v o > whether N2 is established, where N2 is a preset wind speed threshold, such as N2=4 in this embodiment. If yes, proceed to step 10); if not, proceed to step 16);

[0066] 10) The drive mechanism 51 rotates forward a certain number of times, such as 10, causing the fan 12 to rotate downward, thereby increasing the inclination angle of the fan 12 (volute 121) by a reference value, such as 0.5°. The drive mechanism 51 then self-locks and delays for a certain time, such as 30 seconds. The sound sensor 82 collects the noise value again, and sets c = c + 1.

[0067] 11) Determine whether L0 < N1 and c < N3, where N3 is a preset number threshold, such as 10 in this embodiment. If so, return to step 10); if not, set the total operating time of the fan 12 to t0 = t + t0, where t is the current operating time of the fan 12, and proceed to step 12);

[0068] 12) After the fan 12 maintains the current inclination angle for a period of time, the fan is turned off;

[0069] 13) Determine whether t0>N4 holds true, where N4 is a preset running time threshold, such as 36000s in this embodiment. If so, proceed to step 14; if not, proceed to step 15);

[0070] 14) The driving mechanism 51 rotates forward to the limit position, such as making the fan 12 (volute 121) tilt at 10°, and the volute 121 drains oil through the oil drain pipe 6, then t0 = 0 is set, and the process proceeds to step 15);

[0071] 15) Latch t0, end;

[0072] 16) If the flue or smoke pipe is abnormal, the total running time of the fan 12 is set to t0 = t + t0, and the process goes to step 12);

[0073] 17) The speed n of the motor 13 is reduced by a certain value, such as 10 rpm in this embodiment, and maintained for a certain time, such as 30 seconds, and then returns to step 7);

[0074] 18) Determine whether it is the first gear. If so, set the total running time of the fan 12 to t0 = m*t + t0, and go to step 12); if not, set the total running time of the fan 12 to t0 = n*t + t0, and go to step 12), where m and n are constant coefficients, and 1>m>n>0. For example, in this embodiment, m=0.8 and n=0.5.

[0075] In a compact space, the fan is made rotatable so that the front and rear air flow distribution and angle adjustment can be carried out according to the inlet flow rate and working noise, catering to the angle of oil smoke entering the air inlet, ensuring the maximum air volume (effective air volume) and the highest inlet flow rate. The overall negative pressure area is expanded outward to meet the ultimate experience of oil smoke suction effect and noise value. 3 At an operating air volume of 1.577 ft / min, the noise level is lower than 58dB.

Claims

1. A range hood, comprising a power unit (1) for installation above a suspended ceiling, the power unit (1) comprising a fan frame (11) and a fan (12) disposed in the fan frame (11), the fan (12) being arranged horizontally, and the fan (12) comprising a downwardly facing air inlet (1211); characterized in that: The fan (12) is rotatably connected to the fan frame (11), so that the fan (12) can rotate around an axis extending forward and backward, thereby changing the angle of the air inlet (1211) relative to the horizontal plane; The fan (12) further includes an air outlet (1212), and the fan (12) is rotatably connected to the fan frame (11) at the air outlet (1212); The range hood further comprises a connecting pipe (2) and an air inlet assembly (3); the connecting pipe (2) is connected between the fan frame (11) and the air inlet assembly (3); an inlet for oil smoke to enter is formed at the bottom of the fan frame (11), and a wind speed sensor (81) is provided at the inlet; a sound sensor (82) is provided in the connecting pipe (2) or the air inlet assembly (3).

2. The range hood according to claim 1, characterized in that: A mounting opening (111) is provided on the side of the fan frame (11), and an air outlet cover (4) is fixed to the air outlet (1212) of the fan (12). The air outlet cover (4) is inserted into the fan frame (11) through the mounting opening (111) and is fixedly connected to the fan (12).

3. The range hood according to claim 2, characterized in that: The air outlet (1212) of the fan (12) or the air outlet cover (4) is rotatably connected to the fan frame (11) at the upper edge or lower edge of the inner portion of the fan frame (11); the air outlet (1212) or the air outlet cover (4) is connected to the fan frame (11) via a flexible member (15) between the other edges of the inner portion of the fan frame (11); and the flexible member (15) isolates the mounting port (111) from the interior of the fan frame (11).

4. The range hood according to claim 2, characterized in that: The fan (12) includes a volute (121) and an impeller (122) disposed in the volute (121); the volute (121) includes a front cover plate (1215), a rear cover plate (1216) spaced apart above the front cover plate (1215), and an annular wall (1217) located between the front cover plate (1215) and the rear cover plate (1216); the air inlet (1211) is formed on the front cover plate (1215); the front cover plate (1215), the rear cover plate (1216), and the annular wall (1217) together form the air outlet (1212); When the fan (12) is in the initial position, the axis extends in the vertical direction, the air inlet (1211) is horizontal, and the lowest point of the outlet of the air outlet cover (4) is higher than the inner surface of the front cover (1215) of the volute (121).

5. The range hood according to claim 2, characterized in that: The outlet of the air outlet hood (4) is connected to a connecting ring (7) for connecting to an external smoke exhaust pipe, and the connecting ring (7) is gradually inclined upward from the connection with the air outlet hood (4) to the direction away from the air outlet hood (4).

6. The range hood according to claim 1, characterized in that: The fan (12) includes a volute (121), the air inlet (1211) is formed on the volute (121), and the range hood further includes an oil drain pipe (6), one end of the oil drain pipe (6) is fixed to the volute (121), and the other end of the oil drain pipe (6) is a free end and is located in the fan frame (11).

7. The range hood according to claim 6, characterized in that: An air outlet (1212) is formed on the volute (121), the fan (12) is rotatably connected to the fan frame (11) at the air outlet (1212), and the oil drain pipe (6) is fixed at a position of the volute (121) away from the air outlet (1212).

8. The range hood according to claim 6, characterized in that: An air inlet ring (1218) is provided at the air inlet (1211) of the volute (121), and the fixed position of the oil drain pipe (6) and the volute (121) is lower than the upper edge of the air inlet ring (1218).

9. The range hood according to claim 1, characterized in that: The range hood further comprises a motion mechanism for driving the fan (12) to rotate, the motion mechanism comprising a driving mechanism (51) and a transmission mechanism for transmitting the output of the driving mechanism (51) to the fan (12), the transmission mechanism comprising an active end and a driven end respectively located at the front and rear sides of the fan (12), the active end being in transmission connection with the driving mechanism (51).

10. A range hood control method according to claim 1, characterized in that: The steps include: S1) Turn on the range hood; S2) selecting a gear, selecting the following gears: a first gear, a second gear, and a third gear, wherein the first gear is greater than the second gear, and the third gear is an automatic gear; the fan (12) returns to an initial state and is arranged horizontally; when the selected gear is the third gear, entering step S3); S3) increasing the speed of the fan (12) and maintaining it for a certain period of time; S4) Read the current wind speed v=v collected by the wind speed sensor (81) o and the current noise value L=L0 collected by the sound sensor (82), so that the fan (12) posture adjustment count c=0; S5) determining whether L0 < N1 is established, wherein N1 is a preset noise threshold; if so, proceeding to step S6); if not, reducing the speed of the fan (12) and returning to step S4); S6) Determine v o >Whether N2 is established, where N2 is a preset wind speed threshold. If so, proceed to step S7); S7) the fan (12) is rotated downward by a certain angle, and after a certain delay, the sound sensor (82) collects the current noise value L0 again, and sets c=c+1; S8) Determine whether L0 < N1 and c < N3, where N3 is a preset number threshold. If yes, return to step S7; if not, proceed to step S9; S9) The fan (12) maintains the current inclination angle for a period of time and then turns off.

11. The range hood control method according to claim 10, characterized in that: The fan (12) includes a volute (121), the air outlet (1212) is formed on the volute (121), and the range hood further includes a timer and an oil drain pipe (6), one end of the oil drain pipe (6) is fixed to a position of the volute (121) away from the air outlet (1212), and the other end of the oil drain pipe (6) is a free end and is located in the fan frame (11); Before step S1), the timer is initialized. In step S1), the timer starts timing. In step S8), if not, the total running time of the fan (12) is set to t0=t+t0, where t is the running time of the fan (12) this time, and then the process proceeds to step S9). After step S9), the process also includes the following steps: S10) Determine whether t0>N4 is established, wherein N4 is a preset operating time threshold. If so, drive the fan (12) to rotate downward to the limit position, and the fan (12) drains oil through the oil drain pipe (6). Then set t0=0, latch t0, and end; if not, latch t0, and end.

12. The range hood control method according to claim 11, characterized in that: In step S6), if not, it is prompted that the flue or smoke pipe is abnormal, and the total running time of the fan (12) is t0=t+t0, and the process goes to step S9).

13. The range hood control method according to claim 11, characterized in that: In step S2), when the selected gear is the first gear, the total time t0 of the fan (12) running is set to be t0=m*t+t0, and the process proceeds to step S9); if not, the total time t0 of the fan (12) running is set to be t0=n*t+t0, and the process proceeds to step S9, where m and n are constant coefficients, and 1>m>n>0.

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