Noise reduction range hood and control method thereof

Abstract

The invention relates to the field of range hoods, and discloses a noise reduction range hood and a control method thereof.The range hood comprises an air duct, a draught fan and a first sound absorption piece, the draught fan is installed in the air duct and provided with two air inlet areas including the first air inlet area and the second air inlet area, and the air inlet amount of the second air inlet area is larger than that of the first air inlet area; the air conditioner is characterized in that the first sound absorption part is movably arranged in the air duct and provided with a first position and a second position, and the air inlet resistance generated by the first sound absorption part on the second air inlet area when the first sound absorption part is located at the first position is smaller than the air inlet resistance generated by the first sound absorption part on the second air inlet area when the first sound absorption part is located at the second position; the first sound absorption piece moves from the second position to the first position so as to reduce the air inlet resistance of the second air inlet area with the larger air inlet amount, the air inlet amount of the second air inlet area is increased, and therefore the overall air inlet amount of the draught fan is increased.

Description

Technical Field

[0001] This invention relates to the field of range hoods. Background Technology

[0002] like Figure 1 In existing range hoods, a multi-blade centrifugal fan 2' is often installed in the duct 1' to remove the cooking fumes. Figure 1 The arrows in the middle indicate the direction of the oil fume flow. Figure 2 The diagram illustrates a multi-blade centrifugal fan commonly used in range hoods. Based on the position of the fan's volute tongue 23', the fan's air inlet can be divided into the first quadrant 214', the second quadrant 215', the third quadrant 216', and the fourth quadrant 217'. The air intake volume in the third and fourth quadrants is greater than that in the first and second quadrants.

[0003] In addition, noise reduction structures are often installed in the duct to reduce the operating noise of range hoods. However, these structures often increase the resistance to air intake, resulting in a decrease in air volume and a poorer smoke extraction effect. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defect that the air intake volume of the fan is reduced due to the setting of noise reduction structure in the existing range hood, and to provide a noise reduction range hood and its control method.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A noise-reducing range hood includes an air duct, a fan, and a first sound-absorbing component. The fan is installed in the air duct and has two air inlet areas, namely a first air inlet area and a second air inlet area. The air volume in the second air inlet area is greater than that in the first air inlet area. The first sound-absorbing component is movably disposed in the air duct and has a first position and a second position. When the first sound-absorbing component is in the first position, the air resistance it generates on the second air inlet area is less than when it is in the second position. The first sound-absorbing component is configured such that when the air volume of the fan increases, the first sound-absorbing component moves from the second position toward the first position.

[0007] In this design, the air intake resistance generated by the first sound-absorbing component in the second air intake area when it is in the first position is smaller than the air intake resistance generated by the first sound-absorbing component in the second position. When the air intake volume of the fan increases, the first sound-absorbing component moves to the first position to reduce the air intake resistance generated by the second air intake area with a larger air intake volume, thereby increasing the air intake volume of the second air intake area and thus increasing the overall air intake volume of the fan.

[0008] Preferably, the first sound-absorbing element is disposed in the air duct facing the second air inlet area, and the projected area of ​​the first sound-absorbing element in the second air inlet area along the normal direction of the second air inlet area when the first sound-absorbing element is located in the first position is smaller than that when it is located in the second position.

[0009] In this solution, the first sound-absorbing component is positioned facing the first air intake area, and the projected area of ​​the first sound-absorbing component in the second air intake area along the normal direction of the second air intake area when the first sound-absorbing component is in the first position is smaller than the projected area of ​​the first sound-absorbing component in the second air intake area along the normal direction of the second air intake area when the first sound-absorbing component is in the second position. This reduces the coverage of the second air intake area by the first sound-absorbing component when it is in the first position, thereby reducing the air intake resistance generated in the second air intake area.

[0010] Preferably, the first sound-absorbing element is configured such that when the air intake volume of the fan increases to a preset value, the first sound-absorbing element moves from the second position to the first position.

[0011] Preferably, the first sound-absorbing element is configured such that when the air intake volume of the fan is less than or equal to a preset value, the first sound-absorbing element remains in the second position.

[0012] Preferably, the first sound-absorbing element is disposed within the air duct facing the first air inlet area, and the second position is in the direction of the first position along the direction of the second air inlet area toward the first air inlet area.

[0013] In this design, when the air intake of the fan increases, the first sound-absorbing component moves along the second air intake area toward the first air intake area, which reduces the space occupied by the first sound-absorbing component in the air duct and makes the structure inside the air duct more compact.

[0014] Preferably, the first sound-absorbing component has a clearance portion at a corresponding position on the side of the second air inlet area away from the first air inlet area, and the first sound-absorbing component has a hollow portion or a notch to form the clearance portion.

[0015] In this solution, the avoidance part is set to reduce the obstruction of the first sound-absorbing component on the air intake area, which can further improve the air intake volume. The position setting of the avoidance part can ensure that the overall noise reduction effect of the range hood is good enough.

[0016] Preferably, the fan is a multi-blade centrifugal fan, and the first air inlet of the fan has a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant, wherein the air volume in the third quadrant and the fourth quadrant is greater than that in the first quadrant and the second quadrant.

[0017] The first air intake area includes the first quadrant and / or the second quadrant;

[0018] The second air intake area includes the third quadrant and / or the fourth quadrant.

[0019] In this scheme, the air intake volume in the third quadrant is greater than that in the first quadrant and also greater than that in the second quadrant, and the air intake volume in the fourth quadrant is greater than that in the first quadrant and also greater than that in the second quadrant.

[0020] Preferably, the first sound-absorbing member has a clearance portion at a corresponding position on the side of the third quadrant opposite to the first quadrant, and the first sound-absorbing member has a hollow portion or a notch to form the clearance portion.

[0021] In this design, the third quadrant has a larger air intake volume. The placement of the clearance section allows for a greater increase in the air intake volume of the third quadrant when the fan air volume increases, thereby providing the overall air intake volume of the fan. The placement of the clearance section ensures that the overall noise reduction effect of the range hood is good enough.

[0022] Preferably, the direction from the second position to the first position is along the direction from the third quadrant to the first quadrant.

[0023] In this solution, when the first sound-absorbing component moves from the third quadrant toward the first quadrant, it can reduce the obstruction area of ​​the second, third, and fourth quadrants and increase the air intake volume of these three quadrants.

[0024] Preferably, a slide is provided on the wall surface of the air duct, the first sound-absorbing element is slidably disposed on the slide, and the first position and the second position are disposed on the slide.

[0025] In this design, the inclusion of a slide rail can improve the smoothness of the movement of the first sound-absorbing component.

[0026] Preferably, the range hood further includes a drive device for driving the first sound-absorbing element to move.

[0027] Preferably, the range hood further includes a driving device, which includes a magnetic component and a coil. The magnetic component is connected to the first sound-absorbing component, and the coil is disposed on the wall of the air duct for energizing the magnetic component to drive the first sound-absorbing component to move.

[0028] In this solution, a magnetic field is generated by energizing a coil to drive the magnetic component to move, thereby moving the first sound-absorbing component. The structure is simple and easy to control.

[0029] Preferably, a slide is provided on the wall of the air duct, the first position and the second position are located on the slide, and the magnetic component is slidably installed on the slide; the coil is used to attract the magnetic component by passing electricity, and the coil is fixed at the first position of the slide.

[0030] In this design, this configuration ensures that the first sound-absorbing component can move to the first position.

[0031] Preferably, a slide is provided on the wall surface inside the air duct, the first position and the second position are disposed on the slide, and the magnetic component is slidably mounted on the slide; the first position and the second position are respectively located on both sides of the extension direction of the slide.

[0032] In this design, the structure is made compact.

[0033] Preferably, a slide is provided on the wall surface of the air duct, the first position and the second position are disposed on the slide, and the magnetic component is slidably mounted on the slide; the first position is located above the second position.

[0034] In this design, when the coil is de-energized, the magnetic component and the first sound-absorbing component can move downwards under gravity to return to the second position.

[0035] Preferably, the duct extends along the height direction of the range hood, the fan is a multi-blade centrifugal fan, the fan shaft extends along the width direction of the range hood, the air inlet area is located on one side of the fan along the width direction of the range hood, and the first sound-absorbing element is disposed on the wall surface of the duct along the width direction of the range hood facing the air inlet area.

[0036] Preferably, the wall surface inside the air duct is provided with a straight slide rail, and the first sound-absorbing element is slidably installed on the slide rail, with the first position and the second position located on the slide rail.

[0037] Preferably, when the first sound-absorbing element is located in the second position, the center of the first sound-absorbing element is located at the position corresponding to the fan shaft.

[0038] Preferably, the angle between the extension direction of the slide and the downward direction of the height direction of the range hood is between 25° and 35°.

[0039] Preferably, the impeller diameter of the fan is D, and the dimensions of the first sound-absorbing component along the length and height of the range hood are L and H, respectively, where L is between 0.8D and D, and H is between 0.9D and 1.1D.

[0040] Preferably, the distances between the first position and the second position along the length and height of the range hood are m and n, respectively, where m is between 0.2L and 0.3L and n is between 0.1H and 0.15H.

[0041] Preferably, the fan is a dual-inlet fan, including a motor, and a first air inlet and a second air inlet respectively disposed on the front and rear sides of the fan along the width direction of the range hood. The motor is disposed on the rear side of the fan, the air inlet area belongs to the first air inlet, and the first sound-absorbing component is disposed on the rear wall surface inside the air duct.

[0042] In this solution, the motor in the fan is located on the side of the first air inlet, which will reduce the air volume of the first air inlet. By placing the first sound-absorbing component on this side, the first sound-absorbing component can move towards the first position when the air volume of the fan increases, thereby increasing the air volume of the first air inlet and reducing or offsetting the impact of the motor being located on the side of the first air inlet on the air volume of the first air inlet.

[0043] The rear side is farther from the user than the front side, and the noise transmitted to the user from the rear side is also less. By placing the motor, the first sound-absorbing component, and the first air inlet on the rear side inside the air duct, the noise reduction effect of the fan and the air intake effect can be taken into account at the same time.

[0044] Preferably, the range hood further includes a second sound-absorbing component, which is disposed on the front side wall of the duct and faces the second air inlet. The fan is inclined and rearward in the duct from its bottom toward the top volute.

[0045] In this design, the fan is tilted backward from bottom to top, which increases the bottom air intake area on the side of the first air intake, thereby increasing the air intake volume of the rear first air intake. At the same time, the second air intake can be supplemented by air from both sides along the length of the range hood. The reduction in the bottom air intake area on the side of the second air intake has little impact on the air intake volume of the second air intake. As a result, the overall air intake volume of the fan can be increased.

[0046] Preferably, the rear side of the second sound-absorbing element is tilted backward from its bottom toward its top.

[0047] In this design, the rear side of the second sound-absorbing component is tilted backward from bottom to top to match the tilt of the second air inlet, thereby increasing the air intake volume of the second air inlet.

[0048] Preferably, the center of the second sound-absorbing element is higher than the axis of rotation of the fan.

[0049] In this design, the second sound-absorbing component is positioned slightly above the fan, which reduces the air intake resistance of the second air inlet and increases the air volume of the second air inlet. At the same time, the slightly higher position of the second sound-absorbing component allows it to be closer to the volute tongue, resulting in better absorption of noise transmitted from the volute tongue.

[0050] Preferably, the range hood further includes an airflow sensor disposed in the air duct, the airflow sensor being used to obtain the airflow of the fan.

[0051] A control method for a range hood, wherein the range hood adopts a noise-reducing range hood as described in any of the above technical solutions, and the fan has a first working condition with an air intake volume less than or equal to Q1 and a second working condition with an air intake volume greater than Q2, wherein Q2 is greater than Q1.

[0052] When the fan is in the first operating condition, the first sound-absorbing component remains in the second position;

[0053] When the fan is in the second operating condition, the drive device drives the first sound-absorbing component to move from the second position toward the first position.

[0054] The positive and progressive effects of this invention are as follows:

[0055] In this design, the air intake resistance generated by the first sound-absorbing component in the second air intake area when it is in the first position is smaller than the air intake resistance generated by the first sound-absorbing component in the second position. When the air intake volume of the fan increases, the first sound-absorbing component moves to the first position to reduce the air intake resistance of the second air intake area, which has a larger air intake volume, thereby increasing the air intake volume of the second air intake area and thus increasing the overall air intake volume of the fan. Attached Figure Description

[0056] Figure 1 The arrangement of existing fans in a range hood;

[0057] Figure 2 This is a schematic diagram of an existing multi-blade centrifugal fan;

[0058] Figure 3 This is a schematic diagram of a range hood according to an embodiment of the present invention;

[0059] Figure 4 This is a schematic diagram of a fan on the first air inlet side according to an embodiment of the present invention;

[0060] Figure 5 This is a perspective view of the first sound-absorbing member in a first position and a second position according to an embodiment of the present invention;

[0061] Figure 6 This is a perspective view of the first sound-absorbing member in a first position and a second position according to an embodiment of the present invention;

[0062] Figure 7 This is a schematic diagram of the first sound-absorbing element located in the second position according to an embodiment of the present invention;

[0063] Figure 8 This is a schematic diagram of the first sound-absorbing component according to an embodiment of the present invention;

[0064] Figure 9 This is a schematic diagram of a slide track according to an embodiment of the present invention.

[0065] Explanation of reference numerals in the attached figures:

[0066] Range hood 1000;

[0067] Air duct 1;

[0068] Fan 2;

[0069] First air inlet 21, air intake area 211, first air intake area 212, second air intake area 213, first quadrant 214, second quadrant 215, third quadrant 216, fourth quadrant 217;

[0070] Second air inlet 22;

[0071] Cochlear tongue 23;

[0072] First sound-absorbing component 3, clearance part 31;

[0073] Second sound-absorbing component 4;

[0074] Slide 5;

[0075] Mounting bracket 6;

[0076] Magnetic component 7. Detailed Implementation

[0077] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0078] This embodiment provides a noise-reducing range hood. Figures 3-9 This is a schematic diagram of this embodiment. The length, width, and height of the range hood are X, Y, and Z, respectively. The two directions of Y are Y1 and Y2, with Y1 being the direction from the rear to the front of the range hood. In actual use, the front of the range hood is the side facing the user. The two directions of Z are Z1 and Z2, with Z1 being the direction from the top to the bottom of the range hood.

[0079] like Figure 3 Range hoods include:

[0080] Air duct 1;

[0081] Fan 2 is installed inside air duct 1, such as... Figure 3 The fan 2 has two air inlet areas 211, namely a first air inlet area 212 and a second air inlet area 213. The air volume of the second air inlet area 213 is greater than that of the first air inlet area 212.

[0082] First sound-absorbing component 3, such as Figure 5 , Figure 6The first sound-absorbing component 3 is movably disposed in the air duct 1. The first sound-absorbing component 3 has a first position P1 and a second position P2. When the first sound-absorbing component 3 is located at the first position P1, the air intake resistance generated by the first sound-absorbing component 3 on the second air intake area 213 is less than the air intake resistance generated by the first sound-absorbing component 3 on the second air intake area 213 when it is located at the second position P2. When the air intake volume of the fan 2 increases, the first sound-absorbing component 3 moves from the second position P2 toward the first position P1 to reduce the air intake resistance of the second air intake area 213 with a larger air intake volume, increase the air intake volume of the second air intake area 213, and thus increase the overall air intake volume of the fan 2.

[0083] like Figure 3 Duct 1 extends along the height of the range hood, and fan 2 is a multi-blade centrifugal fan. Figure 3 The axis of rotation of the fan 2 is indicated by a dashed line R. R extends along the width direction Y of the range hood. The air inlet area 211 belongs to the first air inlet 21 of the fan 2. The first air inlet 21 is located on the rear side of the fan 2. The first sound-absorbing component 3 is set on the rear wall of the air duct 1, facing the first air inlet 21.

[0084] like Figure 4 The first air inlet 21 of the fan 2 has a first quadrant 214, a second quadrant 215, a third quadrant 216, and a fourth quadrant 217. The air volume of the third quadrant 216 and the fourth quadrant 217 is greater than that of the first quadrant 214 and the second quadrant 215. The first air inlet area 212 includes the first quadrant 214 and the second quadrant 215. The second air inlet area 213 includes the third quadrant 216 and the fourth quadrant 217, so that the air volume of the second air inlet area 213 is greater than that of the first air inlet area 212.

[0085] like Figure 3 The first sound-absorbing component 3 is positioned inside the air duct 1 facing the first air inlet 21. The extension direction of the shaft axis R of the fan 2 is also the normal direction of the two air inlet areas 211. Figure 5 When the first sound-absorbing component 3 is in the first position, the projected area of ​​the first sound-absorbing component 3 falling into the second air intake area 213 along the R extension direction is smaller than the projected area of ​​the first sound-absorbing component 3 falling into the second air intake area 213 along the R extension direction when it is in the second position. This reduces the coverage of the first sound-absorbing component 3 on the second air intake area 213 when it is in the first position, thereby reducing the air intake resistance generated on the second air intake area 213.

[0086] like Figure 5The second position is in the direction of the first position, and the direction of the third quadrant 216 is in the direction of the first quadrant 214. When the first sound-absorbing component 3 moves in the direction of the third quadrant 216 in the direction of the first quadrant 214, it can reduce the shading area of ​​the second quadrant 215, the third quadrant 216, and the fourth quadrant 217, increase the air intake of these three quadrants, and also reduce the space occupied by the first sound-absorbing component 3 in the air duct 1 when it moves, making the structure in the air duct 1 compact.

[0087] like Figure 7 The first sound-absorbing component 3 has a notch at the bottom to form a clearance part 31. The clearance part 31 is located on the side of the third quadrant 216 away from the first quadrant 214. The third quadrant 216 has a larger air intake, and the clearance part 31 allows for a greater increase in the air intake of the third quadrant 216 when the air volume of the fan 2 increases, thereby improving the overall air intake of the fan 2. The volute tongue 23 in the fan 2 produces significant noise, such as... Figure 3 The volute tongue 23 of the fan 2 is located at the top of the fan 2, away from the third quadrant 216. The first sound-absorbing component 3 has a clearance part 31 at the position corresponding to the third quadrant 216, which has little impact on the overall noise reduction effect of the fan 2 and can ensure that the overall noise reduction effect of the fan 2 is good enough. In other embodiments, a notched or hollowed-out part can be provided on the first sound-absorbing component 3 to form the clearance part 31.

[0088] like Figure 6 A slide rail 5 is provided on the wall surface inside the air duct 1. The first sound-absorbing component 3 is slidably mounted on the slide rail 5, with the first position and the second position located on the slide rail 5. The slide rail 5 can improve the smoothness of the movement of the first sound-absorbing component 3. The slide rail 5 can be a slide rail or a slide groove. In this embodiment, a slide groove is used to make the structure compact.

[0089] In this embodiment, the range hood further includes a driving device for driving the first sound-absorbing component 3 to move. Further, the driving device includes a magnetic component 7 and a coil, such as... Figure 7The magnetic component 7 is connected to the first sound-absorbing component 3 and slidably mounted on the slide rail 5. A coil is mounted on the wall of the air duct 1. When the coil is energized, it generates a magnetic field, which exerts a magnetic force on the magnetic component 7, thereby controlling the magnetic component 7 to move the first sound-absorbing component 3. The structure is simple and easy to control. Specifically, the magnetic component 7 is a magnet, and the driving device is a current relay. Furthermore, the first position and the second position are located on opposite sides of the extension direction of the slide rail 5, making the structure compact. In other embodiments, the driving device may be, but is not limited to, an electromagnetic control device, an electric telescopic rod, etc. In other embodiments, a driving device may not be provided; for example, the first sound-absorbing component 3 can be manually driven to move; or, an elastic component can be installed on the first sound-absorbing component 3, and the position of the first sound-absorbing component 3 can be adjusted by balancing the elastic force of the elastic component and the airflow force. When the air intake of the fan 2 increases, the airflow force increases, driving the elastic component to deform and move the first sound-absorbing component 3.

[0090] In this embodiment, when the air intake of the fan 2 increases, the first sound-absorbing component 3 moves from the second position to the first position. Specifically, the coil is energized to generate an electromagnetic force that attracts the magnetic component 7, and the coil is fixed at the first position of the slide rail 5, ensuring that the first sound-absorbing component 3 can move to the first position. Further, as... Figure 6 The first position is located above the second position. When the coil is de-energized, the magnetic component 7 and the first sound-absorbing component 3 can automatically reset under gravity and move downwards to the second position. In other embodiments, but not limited to, an elastic reset component can be provided to drive the magnetic component 7 to reset, or a reverse current can be passed through the coil to generate a reverse electromagnetic force to drive the elastic component to reset.

[0091] The first sound-absorbing component 3 and the second sound-absorbing component 4 of the present invention may be, but are not limited to, sound-absorbing cotton or perforated plates. In this embodiment, the sound-absorbing cotton is used. The first sound-absorbing component 3 is mounted on the mounting bracket 6. The mounting bracket 6 is fixed to the wall surface inside the air duct 1. The magnetic component 7 is fixed on the mounting bracket 6.

[0092] In this embodiment, the impeller diameter of the fan 2 is D, such as Figure 8 The dimensions of the first sound-absorbing component 3 along the X and Z directions are L and H, respectively. L is between 0.8D and D, and H is between 0.9D and 1.1D, so that the first sound-absorbing component 3 basically covers the first air inlet 21 of the fan 2.

[0093] The shaft of fan 2 is located at the center of fan 2, such as Figure 5 When the first sound-absorbing component 3 is in the second position, the center of the first sound-absorbing component 3 is located at the position corresponding to the shaft of the fan 2, which can cover the four quadrants of the first air inlet 21, resulting in good noise reduction.

[0094] like Figure 8The slide extends in a straight line, and the angle α between the extension direction of the slide 5 and the Z1 direction is between 25° and 35°. The extension dimensions of the slide 5, that is, the distance between the first position and the second position, are m and n along the X and Z directions, respectively. m is between 0.2L and 0.3L, and n is between 0.1H and 0.15H. This ensures that the distance the first sound-absorbing component 3 moves from the second position to the first position is large enough to effectively increase the air intake volume; at the same time, it ensures that the distance the first sound-absorbing component 3 moves from the second position to the first position is small enough to minimize the negative effect on noise reduction. The overall structure inside the air duct 1 is relatively compact.

[0095] like Figure 3 The fan 2 is a dual-inlet fan 2, which includes a motor and a second air inlet 22. The second air inlet 22 is located at the front of the fan 2 along the Y direction, while the first air inlet 21 is located at the rear of the fan 2. The motor's location at the rear of the fan 2 reduces the airflow at the first air inlet 21. By placing the first sound-absorbing component 3 at the rear, it can move towards a first position when the airflow from the fan 2 increases, thereby increasing the airflow at the first air inlet 21 and reducing or offsetting the impact of the motor's location on the airflow at the first air inlet 21. The rear side is farther from the user than the front side, resulting in less noise transmitted to the user. By placing the motor, the first sound-absorbing component 3, and the first air inlet 21 all at the rear of the duct 1, both noise reduction and increased airflow from the fan 2 can be achieved simultaneously. Extensive existing literature discloses the structural configuration of the dual-inlet fan 2, which will not be elaborated upon here.

[0096] like Figure 3 The range hood also includes a second sound-absorbing component 4, which is installed on the front wall of the air duct 1 and faces the second air inlet 22. The fan 2 is tilted backward from bottom to top, which can increase the bottom air intake area on the side of the first air inlet 21, thereby increasing the air intake volume of the rear first air inlet 21. At the same time, the second air inlet 22 can be supplemented with air from both sides in the X direction. The reduction in the bottom air intake area on the side of the second air inlet 22 has little impact on the air intake volume of the second air inlet 22. Thus, the overall air intake volume of the fan 2 can be increased.

[0097] Furthermore, such as Figure 3 The rear side of the second sound-absorbing component 4, that is, the side facing the second air inlet 22, is tilted backward from bottom to top to match the tilt of the second air inlet 22, reduce the air intake resistance of the second air inlet 22, and increase the air intake volume of the second air inlet 22.

[0098] like Figure 3 The center position of the second sound-absorbing component 4 is higher than the axis R of the rotating shaft of the fan 2, so that the second sound-absorbing component 4 is set relatively higher than the fan 2, which can further reduce the air intake resistance of the second air inlet 22 and increase the air intake volume. Figure 3The dashed line H3 in the middle indicates the approximate height of the user's ear during the use of the range hood. By setting the second sound-absorbing component 4 slightly higher, it can be closer to the volute tongue 23, which has a better absorption effect on the noise transmitted from the volute tongue 23 and reduces the noise transmitted to the user.

[0099] In this embodiment, an airflow sensor is installed inside the air duct 1. The airflow rate of the fan 2 is obtained based on the data detected by the airflow sensor, thereby controlling the movement of the first sound-absorbing component 3. In other embodiments, the airflow rate of the fan 2 can be obtained, but is not limited to, through an airflow sensor or the operating speed of the fan 2.

[0100] In this embodiment, the fan 2 can be operated in the following manner:

[0101] When the fan 2 is in the first operating condition, it is in the high-speed state with a small air intake volume, which is less than or equal to Q1. The first sound-absorbing component 3 is kept in the second position, which can ensure that the air intake volume of the fan 2 meets the usage requirements. At this time, the position of the first sound-absorbing component 3 is directly opposite the second air inlet 22, which can absorb more noise from the second air inlet 22, while reducing the turbulence in the upper part of the air duct 1 and reducing turbine noise.

[0102] When the fan 2 is in the second operating condition, it is in automatic mode. When the air intake volume increases, exceeds Q1 and is greater than or equal to Q2, the coil is energized to generate a magnetic field that controls the magnetic component 7 to drive the first sound-absorbing component 3 from the second position to the first position, so as to reduce the air intake resistance of the second air intake 22 and increase the air intake volume of the second air intake 22.

[0103] In other embodiments, the first sound-absorbing element 3 can be configured to move between the second position and the first position and remain between the second position and the first position, and move closer to the first position as the air intake of the fan 2 increases.

[0104] The range hood can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the range hood to perform corresponding operations, thereby realizing intelligent control of the range hood and improving the user experience.

[0105] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A noise-reducing range hood, comprising an air duct, a fan, and a first sound-absorbing component, wherein the fan is installed within the air duct, and the fan has two air inlet areas, namely a first air inlet area and a second air inlet area, wherein the air volume in the second air inlet area is greater than the air volume in the first air inlet area, characterized in that... The first sound-absorbing element is movably disposed within the air duct. The first sound-absorbing element has a first position and a second position. When the first sound-absorbing element is located in the first position, the air intake resistance generated on the second air intake area is less than when it is located in the second position. The first sound-absorbing element is configured such that when the air intake volume of the fan increases, the first sound-absorbing element moves from the second position toward the first position.

2. The noise-reducing range hood as described in claim 1, characterized in that, The first sound-absorbing component is disposed in the air duct facing the second air inlet area. When the first sound-absorbing component is located in the first position, the projected area of ​​the first sound-absorbing component falling in the second air inlet area along the normal direction of the second air inlet area is smaller than when it is located in the second position. And / or, the first sound-absorbing element is configured such that when the air intake volume of the fan is greater than or equal to a preset value, the first sound-absorbing element moves from the second position to the first position; And / or, the first sound-absorbing element is configured such that when the air intake of the fan is less than or equal to a preset value, the first sound-absorbing element remains in the second position.

3. The noise-reducing range hood as described in claim 2, characterized in that, The first sound-absorbing component is also disposed in the air duct facing the first air inlet area, and the second position is in the direction of the first position along the direction of the second air inlet area towards the first air inlet area.

4. The noise-reducing range hood as described in claim 3, characterized in that, The first sound-absorbing component has a clearance portion at a corresponding position on the side of the second air inlet area away from the first air inlet area. The first sound-absorbing component has a hollow portion or a notch to form the clearance portion.

5. The noise-reducing range hood as described in claim 1, characterized in that, The fan is a multi-bladed centrifugal fan, and the first air inlet of the fan has a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant. The air volume in the third quadrant and the fourth quadrant is greater than that in the first quadrant and the second quadrant. The first air intake area includes the first quadrant and / or the second quadrant; The second air intake area includes the third quadrant and / or the fourth quadrant.

6. The noise-reducing range hood as described in claim 5, characterized in that, The first sound-absorbing component has a clearance portion at a corresponding position on the side of the third quadrant away from the first quadrant, and the first sound-absorbing component has a hollow portion or a notch to form the clearance portion. And / or, the direction of the second position toward the first position is along the direction of the third quadrant toward the first quadrant.

7. The noise-reducing range hood as described in claim 1, characterized in that, The wall surface inside the air duct is provided with a slide rail, and the first sound-absorbing component is slidably disposed on the slide rail, with the first position and the second position disposed on the slide rail; And / or, the range hood further includes a drive device for driving the first sound-absorbing element to move.

8. The noise-reducing range hood as described in claim 1, characterized in that, The range hood also includes a driving device, which includes a magnetic component and a coil. The magnetic component is connected to the first sound-absorbing component, and the coil is disposed on the wall of the air duct for energizing the magnetic component to drive the first sound-absorbing component to move.

9. The noise-reducing range hood as described in claim 8, characterized in that, The wall surface inside the air duct is provided with a slide rail, the first position and the second position are located on the slide rail, and the magnetic component is slidably installed on the slide rail; The coil is used to attract the magnetic component when energized, and the coil is fixed at the first position of the slide rail; and / or, the first position and the second position are respectively located on both sides of the extension direction of the slide rail; and / or, the first position is located above the second position.

10. The noise-reducing range hood as described in claim 1, characterized in that, The air duct extends along the height direction of the range hood, the fan is a multi-bladed centrifugal fan, the fan shaft extends along the width direction of the range hood, the air inlet area is located on one side of the fan along the width direction of the range hood, and the first sound-absorbing component is disposed on the wall surface of the air duct along the width direction of the range hood facing the air inlet area.

11. The noise-reducing range hood as described in claim 10, characterized in that, The wall inside the air duct is provided with a straight slide rail, and the first sound-absorbing component is slidably installed on the slide rail, with the first position and the second position located on the slide rail; When the first sound-absorbing component is located in the second position, the center of the first sound-absorbing component is located at the position corresponding to the fan shaft; and / or, the angle between the extension direction of the slide and the downward direction of the height direction of the range hood is between 25° and 35°; and / or, the impeller diameter of the fan is D, the dimensions of the first sound-absorbing component along the length and height directions of the range hood are L and H respectively, where L is between 0.8D and D, and H is between 0.9D and 1.1D; the distances between the first position and the second position along the length and height directions of the range hood are m and n respectively, where m is between 0.2L and 0.3L, and n is between 0.1H and 0.15H.

12. The noise-reducing range hood as described in claim 10, characterized in that, The fan is a dual-inlet fan, including a motor, and a first air inlet and a second air inlet respectively disposed on the front and rear sides of the fan along the width direction of the range hood. The motor is disposed on the rear side of the fan, the air intake area belongs to the first air inlet, and the first sound-absorbing component is disposed on the rear wall surface inside the air duct.

13. The noise-reducing range hood as described in claim 12, characterized in that, The range hood also includes a second sound-absorbing component, which is disposed on the front side wall of the air duct and faces the second air inlet. The fan is inclined and rearward in the air duct from its bottom toward the top volute. The rear side of the second sound-absorbing element is tilted backward from its bottom towards its top; and / or, the center position of the second sound-absorbing element is higher than the axis of rotation of the fan.

14. The noise-reducing range hood as described in claim 1, characterized in that, The range hood also includes an air volume sensor installed in the air duct, which is used to obtain the air intake volume of the fan.

15. A control method for a range hood, characterized in that, The range hood is a noise-reducing range hood as described in any one of claims 1-14, and the fan has a first working condition with an air intake volume less than or equal to Q1 and a second working condition with an air intake volume greater than Q2, where Q2 is greater than Q1; When the fan is in the first operating condition, the first sound-absorbing component remains in the second position; When the fan is in the second operating condition, the drive device drives the first sound-absorbing component to move from the second position toward the first position.

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