Rectifier device, extractor hood and control method thereof

Abstract

The embodiment of the application discloses a rectifying device, a range hood and a control method thereof, comprising a first rectifying net, a second rectifying net and a driving assembly, the first rectifying net and the second rectifying net are coaxially arranged, the driving assembly is in contact with the first rectifying net, and the driving assembly is used for driving the first rectifying net to rotate relative to the second rectifying net; the effective ventilation diameter of the first ventilation hole of the first rectifying net is greater than or equal to the effective ventilation diameter of the second ventilation hole of the second rectifying net; through the structural arrangement, the relative positions of the first ventilation hole of the first rectifying net and the second ventilation hole of the second rectifying net can be dynamically adjusted, the size of the rectifying net hole can be dynamically adjusted, the ventilation amount can be dynamically adjusted, and better rectification and noise reduction can be realized.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, and in particular to a rectifier, a range hood, and a control method thereof. Background Technology

[0002] Household range hoods utilize centrifugal fans to extract oily air from the kitchen and discharge it into a shared exhaust duct or directly outdoors. A collector is typically installed at the fan inlet to improve airflow, increase fan efficiency, and reduce noise. However, existing rectifier meshes at the volute inlet cannot dynamically adjust their mesh size based on resistance levels, hindering effective airflow rectification and noise reduction, significantly impacting the user experience. Summary of the Invention

[0003] In view of this, the rectifier, range hood and control method provided in the embodiments of the present invention can dynamically adjust the relative positions of the first ventilation hole of the first rectifier mesh and the second ventilation hole of the second rectifier mesh, thereby dynamically adjusting the size of the rectifier mesh holes and thus dynamically adjusting the ventilation volume, achieving better rectification and noise reduction.

[0004] In a first aspect, embodiments of the present invention provide a rectification device, including a first rectifier grid, a second rectifier grid, and a driving component, wherein the first rectifier grid and the second rectifier grid are coaxially arranged;

[0005] The drive component is in contact with the first rectifier mesh, and the drive component is used to drive the first rectifier mesh to rotate relative to the second rectifier mesh.

[0006] The first rectifier mesh includes multiple first ventilation holes, and the second rectifier mesh includes multiple second ventilation holes. The effective ventilation diameter of the first ventilation holes is greater than or equal to the effective ventilation diameter of the second ventilation holes. Along the air intake direction, the first ventilation holes and the second ventilation holes overlap or intersect.

[0007] Optionally, the first ventilation hole is a groove along the air intake direction; or, the first ventilation hole is a groove, the second ventilation hole is a groove, and the diameter of the air intake end face of the second ventilation hole is larger than the effective ventilation diameter of the first ventilation hole.

[0008] Optionally, all first ventilation holes are the same size, and / or all second ventilation holes are the same size.

[0009] Optionally, with the center of the first rectifier mesh as the center, a plurality of first ventilation holes (11) are arranged in a ring around the center of the first rectifier mesh (1);

[0010] With the center of the second rectifier mesh (2) as the center, a plurality of second ventilation holes (21) are arranged in a ring around the center of the second rectifier mesh.

[0011] Optionally, the first ventilation holes on the same ring are distributed at equal intervals; the second ventilation holes on the same ring are distributed at equal intervals.

[0012] Optionally, the area of ​​the first ventilation hole gradually decreases along the direction from the center to the edge of the first rectifier mesh; and / or, the area of ​​the second ventilation hole gradually decreases along the direction from the center to the edge of the second rectifier mesh.

[0013] Optionally, a gear is provided at the edge of the first rectifier mesh, and the drive assembly includes a motor and a gear plate, with the motor connected to the gear plate; the gear plate is driven by the gear of the first rectifier mesh.

[0014] Secondly, embodiments of the present invention also provide a range hood, including the rectifier device provided in the first aspect, and further including a fan and a wind pressure detection device. The fan is located at the top of the range hood, the rectifier device is located at the air inlet of the fan, and the wind pressure detection device is located at the air outlet of the fan.

[0015] Thirdly, embodiments of the present invention also provide a control method for a range hood, the control method comprising:

[0016] Get the current air resistance value of the range hood fan outlet;

[0017] Compare the wind resistance value with the wind resistance threshold.

[0018] When the wind resistance value is greater than the wind resistance threshold, determine the rotation angle corresponding to the wind resistance threshold.

[0019] Based on the rotation angle, the first rectifier grid is controlled to rotate relative to the second rectifier grid to a misaligned position; where different wind resistance thresholds correspond to different rotation angles.

[0020] When the wind resistance value is less than or equal to the wind resistance threshold, the first rectifier net is controlled to rotate relative to the second rectifier net to the initial position.

[0021] Optionally, before obtaining the current air resistance value of the range hood fan outlet, the control method includes:

[0022] Obtain the current operating level of the range hood and determine the corresponding wind resistance threshold based on the operating level; different operating levels correspond to different wind resistance thresholds.

[0023] The rectification device provided in this embodiment of the invention includes a first rectification net, a second rectification net, and a driving component. The first and second rectification nets are stacked, and the centers of the first and second rectification nets are connected by a limiting ring and a bearing. The driving component drives the first rectification net to rotate relative to the second rectification net with its central axis as the rotation axis. The effective ventilation diameter of the first ventilation hole of the first rectification net is set to be greater than or equal to the effective ventilation diameter of the second ventilation hole of the second rectification net. The relative position of the first ventilation hole of the first rectification net and the second ventilation hole of the second rectification net can be dynamically adjusted according to the wind resistance value of the fan outlet, so as to dynamically adjust the size of the rectification net holes and thus dynamically adjust the ventilation volume. When the wind resistance is high, the air intake area of ​​the fan inlet is reduced to enhance the rectification effect, reduce the size of the eddy currents, and reduce eddy current noise. When the wind resistance is low, the air intake area of ​​the fan inlet is increased to reduce the air intake resistance and achieve better rectification and noise reduction. Attached Figure Description

[0024] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0025] Figure 1 A schematic diagram of the structure of a rectifier device provided by the present invention;

[0026] Figure 2 This is a cross-sectional structural diagram of a rectifier device provided by the present invention;

[0027] Figure 3 A schematic diagram of a rectifier device provided by the present invention;

[0028] Figure 4 A cross-sectional schematic diagram of the first rectifier grid and the second rectifier grid provided by the present invention;

[0029] Figure 5 A top view of the rectifier device provided by the present invention;

[0030] Figure 6 Another cross-sectional schematic diagram of the first and second rectifier grids provided by the present invention;

[0031] Figure 7 Another cross-sectional schematic diagram of the first rectifier grid and the second rectifier grid provided by the present invention;

[0032] Figure 8 This invention provides a schematic diagram of the structure of a range hood;

[0033] Figure 9 yes Figure 8 Schematic diagram of the internal structure of region M;

[0034] Figure 10A schematic diagram of a control method for a range hood provided by the present invention;

[0035] Figure 11 This is a flowchart illustrating a control method for a range hood provided by the present invention.

[0036] In the figure:

[0037] 1. First rectifier mesh; 11. First ventilation hole; 12. Gear; 2. Second rectifier mesh; 21. Second ventilation hole; 4. Limiting ring; 41. Ring; 5. Bearing; 3. Drive assembly; 31. Motor; 32. Gear disc; 100. Fan. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be fully described below with reference to the accompanying drawings in the embodiments of this invention, through specific implementation methods. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort fall within the protection scope of this invention.

[0039] Example

[0040] Figure 1 A schematic diagram of the structure of a rectifier device provided by the present invention; Figure 2 This is a cross-sectional structural diagram of a rectifier device provided by the present invention; Figure 3 A schematic diagram of a rectifier device provided by the present invention; Figure 4 A cross-sectional schematic diagram of the first rectifier grid and the second rectifier grid provided by the present invention; Figure 5 This is a top view schematic diagram of the rectifier device provided by the present invention. Figure 5 Figure (a) shows the initial positions of the first and second rectifier meshes, where the mesh openings are largest. Figure 5 Figure (b) shows the position of maximum misalignment of the first rectifier mesh after it has been rotated 90° relative to the second rectifier mesh. The mesh size is smallest at this position.

[0041] Combination Figures 1-5As shown, an embodiment of the present invention provides a rectification device including a first rectification net 1, a second rectification net 2, and a driving component 3. The first rectification net 1 and the second rectification net 2 are coaxially arranged, and the driving component 3 is in contact with the first rectification net 1. The driving component 3 is used to drive the first rectification net 1 to rotate relative to the second rectification net 2. The first rectification net 1 includes a plurality of first ventilation holes 11, and the second rectification net 2 includes a plurality of second ventilation holes 21. The effective ventilation diameter D1 of the first ventilation holes 11 is greater than or equal to the effective ventilation diameter D2 of the second ventilation holes 21. Along the air intake direction, the first ventilation holes 11 and the second ventilation holes 21 overlap or intersect.

[0042] Specifically, in combination Figure 1 As shown, the rectifier provided in this embodiment of the invention can accommodate the air inlet of a range hood fan. The rectifier consists of a first rectifier mesh 1, a second rectifier mesh 2, and a drive assembly 3. As an example, combined with... Figure 2 and Figure 3 As shown, the first rectifier mesh 1 and the second rectifier mesh 2 are circular in shape and are coaxially arranged. A bearing 5 is set in the central area of ​​the first rectifier mesh 1, and a limiting ring 4 is set in the central area of ​​the second rectifier mesh 2. The limiting ring 4 has a ring 41. The bearing 5 of the first rectifier mesh 1 is nested on the ring 41 of the limiting ring 4 of the second rectifier mesh 2. The center of the first rectifier mesh 1 and the center of the second rectifier mesh 2 are not fixedly connected through the limiting ring 4 and the bearing 5. The drive assembly 3 is gear-driven with the first rectifier mesh 1. The drive assembly 3 can drive the first rectifier mesh 1 to rotate clockwise or counterclockwise relative to the second rectifier mesh 2 with its center as the axis of rotation. During the rotation, the first ventilation hole 11 and the second ventilation hole 21 overlap or intersect along the air intake direction. By adjusting the size of the rectifier mesh holes, the ventilation volume of the first rectifier mesh 1 and the second rectifier mesh 2 can be adjusted. Here, the rectifier mesh holes refer to the overlapping area of ​​the first ventilation hole 11 and the second ventilation hole 21 along the air intake direction. Larger rectifier mesh openings result in greater ventilation; smaller rectifier mesh openings result in less ventilation.

[0043] Specifically, in combination Figure 3 and Figure 4 As shown, multiple first ventilation holes 11 are provided on the surface of the first rectifier mesh 1, and multiple second ventilation holes 21 are provided on the surface of the second rectifier mesh 2. The shapes of the first ventilation holes 11 and the second ventilation holes 21 can be polygonal or circular. As an example, the shapes of the first ventilation holes 11 and the second ventilation holes 21 are set to hexagonal, and the diameter of the inscribed circle of the hexagon is the effective ventilation diameter. The effective ventilation diameter D1 of the first ventilation hole 11 is set to be greater than or equal to the effective ventilation diameter D2 of the second ventilation hole 21. By limiting D1 ≥ D2, along the air intake direction, when the first ventilation hole 11 and the second ventilation hole 21 are misaligned, the smaller second ventilation hole 21 can compress the ventilation volume.

[0044] Specifically, the driving component 3 drives the first rectifier mesh 1 to rotate clockwise or counterclockwise relative to the second rectifier mesh 2 by a certain angle, for example, rotating 0° to 360° clockwise. The first rectifier mesh 1 has various relative position states with respect to the second rectifier mesh 2. For example, the initial position is taken as the overlap of the center of the first ventilation hole 11 and the center of the second ventilation hole 21. Figure 5 As shown in Figure (a), when the rotation angle is 0°, along the intake direction (e.g.) Figure 4 (In the direction indicated by the dashed arrow), the first rectifier mesh 1 and the second rectifier mesh 2 have the largest rectifier mesh openings, resulting in the maximum ventilation volume. Taking the initial position as the origin, the drive assembly 3 drives the first rectifier mesh 1 to rotate clockwise relative to the second rectifier mesh 2 by 15°, 30°, 45°, 60°, and 90° rotation angles in sequence. At the misaligned positions of the 15°, 30°, 45°, 60°, and 90° rotation angles, along the air intake direction, the first ventilation hole 11 and the second ventilation hole 21 intersect, and the rectifier mesh openings of the first rectifier mesh 1 and the second rectifier mesh 2 decrease in size sequentially, with the ventilation volume decreasing from the maximum to the minimum. When the clockwise rotation angles continue to increase sequentially by 105°, 135°, and 180°, the rectifier mesh openings of the first rectifier mesh 1 and the second rectifier mesh 2 increase in size sequentially, with the ventilation volume increasing from the minimum to the maximum.

[0045] As an example, such as Figure 5 As shown in Figure (b), the first rectifier mesh 1 can be rotated 90° clockwise relative to the second rectifier mesh 2, resulting in the smallest possible mesh openings for both the first rectifier mesh 1 and the second rectifier mesh 2, thus achieving the minimum ventilation volume; Figure 5 As shown in Figure (a), the first rectifier mesh 1 can also be rotated 180° clockwise relative to the second rectifier mesh 2. The combination of the first rectifier mesh 1 and the second rectifier mesh 2 has the maximum ventilation volume, which is the initial position.

[0046] Furthermore, in this embodiment of the invention, the relative positions of the first ventilation hole 11 of the first rectifier mesh 1 and the second ventilation hole 21 of the second rectifier mesh 2 are adjusted based on the wind resistance value of the fan outlet to change the ventilation volume. Specifically, when the wind resistance of the fan outlet is large, the drive assembly 3 drives the first rectifier mesh 1 to rotate relative to the second rectifier mesh 2, so that the first rectifier mesh 1 and the second rectifier mesh 2 dynamically rotate and combine to form a smaller rectifier mesh hole, thereby reducing the air intake area of ​​the fan inlet, enhancing the rectification effect, eliminating small-size eddies, and reducing eddy noise; when the wind resistance of the fan outlet is small, the drive assembly 3 drives the first rectifier mesh 1 to rotate relative to the second rectifier mesh 2, so that the first rectifier mesh 1 and the second rectifier mesh 2 dynamically rotate and combine to form a larger rectifier mesh hole, thereby increasing the air intake area of ​​the fan inlet and reducing the air intake resistance.

[0047] In summary, the rectification device provided in this embodiment of the invention includes a first rectification net, a second rectification net, and a driving component. The first and second rectification nets are coaxially arranged, and the driving component drives the first rectification net to rotate relative to the second rectification net. The effective ventilation diameter of the first ventilation hole of the first rectification net is greater than or equal to the effective ventilation diameter of the second ventilation hole of the second rectification net. According to the wind resistance value of the fan outlet, the overlap or stagger of the first and second rectification nets is dynamically adjusted to achieve dynamic adjustment of ventilation volume. When the wind resistance is high, the air inlet area of ​​the fan is reduced to enhance the rectification effect, reduce small-size eddies, and reduce eddy noise. When the wind resistance is low, the air inlet area of ​​the fan is increased to reduce the air inlet resistance and achieve better rectification and noise reduction.

[0048] Figure 6 Another cross-sectional schematic diagram of the first and second rectifier grids provided by the present invention; Figure 7 This is another cross-sectional schematic diagram of the first and second rectifier meshes provided by the present invention. Based on the above embodiments, the ventilation volume can also be changed by adjusting the shape of the first ventilation hole 11 and the second ventilation hole 21. Combined with... Figure 6 As shown, in some embodiments, along the intake direction (e.g.) Figure 6 (In the direction indicated by the dashed arrow), the first ventilation hole 11 is a groove V. The effective ventilation diameter D1 of the first ventilation hole 11 is larger than the effective ventilation diameter D2 of the second ventilation hole 21. The groove V shape is beneficial to control the wind direction and can concentrate the wind.

[0049] In some other embodiments, combined Figure 7 As shown, the first ventilation hole 11 is a groove V, and the second ventilation hole 21 is a groove V. The effective ventilation diameter D1 of the first ventilation hole 11 is larger than the effective ventilation diameter D2 of the second ventilation hole 21, and the diameter D3 of the air inlet end face of the second ventilation hole 21 is larger than the effective ventilation diameter D1 of the first ventilation hole 11. The fact that both the first ventilation hole 11 and the second ventilation hole 21 are grooved can control the airflow direction and concentrate the air. Furthermore, setting the diameter D3 of the air inlet end face of the second ventilation hole 21 to be larger than the effective ventilation diameter D1 of the first ventilation hole 11 ensures that at least part of the air passing through the first ventilation hole 11 enters the second ventilation hole 21, achieving dynamic adjustment of the ventilation volume and preventing the first ventilation hole 11 and the second ventilation hole 21 from not overlapping, thus avoiding the occurrence of no airflow through the rectifier mesh.

[0050] Based on the above embodiments, combined with Figures 4-7 As shown, in some embodiments, all first ventilation holes 11 are the same size, and / or all second ventilation holes 21 are the same size.

[0051] With this setting, during the rotation of the first rectifier mesh 1 relative to the second rectifier mesh 2, it is beneficial to form rectifier mesh holes with consistent air permeability, thereby making the air permeability of each rectifier mesh hole uniform, further enhancing the rectification effect and reducing eddy noise.

[0052] Based on the above embodiments, continue to combine Figure 3 As shown, in some embodiments, with the center of the first rectifier mesh 1 as the center, a plurality of first ventilation holes 11 are arranged in a plurality of rings around the center of the first rectifier mesh 1; with the center of the second rectifier mesh 2 as the center, a plurality of second ventilation holes 21 are arranged in a plurality of rings around the center of the second rectifier mesh 2.

[0053] With this setting, when the first rectifier mesh 1 rotates relative to the second rectifier mesh 2, the first ventilation holes 11 on the same ring have the same linear velocity, which helps to balance the ventilation volume on the same ring and obtain rectifier mesh holes with consistent air permeability. This makes the air permeability of each rectifier mesh hole uniform, further enhancing the rectification effect and reducing eddy noise.

[0054] Based on the above embodiments, continue to combine Figure 3 As shown, in some embodiments, the first ventilation holes 11 located on the same ring are equally spaced; the second ventilation holes 21 located on the same ring are equally spaced. This arrangement allows the airflow passing through the first ventilation holes 11 of the first rectifier mesh 1 to be evenly distributed, and further evenly enters the second ventilation holes 21 of the second rectifier mesh 2. This facilitates the dynamic rotation and combination of the first rectifier mesh 1 and the second rectifier mesh 2 to form a rectifier mesh with uniform airflow, thereby ensuring uniform airflow through each rectifier mesh, enhancing the rectification effect, and reducing eddy noise.

[0055] Based on the above embodiments, continue to combine Figure 3 As shown, the first rectifier mesh 1 and the second rectifier mesh 2 rotate relative to each other. In some embodiments, along the direction from the center to the edge of the first rectifier mesh 1, only the area of ​​the first ventilation hole 11 can be provided to gradually decrease. In some embodiments, along the direction from the center to the edge of the second rectifier mesh 2, only the area of ​​the second ventilation hole 21 can be provided to gradually decrease. In some embodiments, along the direction from the center to the edge of the first rectifier mesh 1, the area of ​​the first ventilation hole 11 gradually decreases, and along the direction from the center to the edge of the second rectifier mesh 2, the area of ​​the second ventilation hole 21 gradually decreases.

[0056] Specifically, continue to combine Figure 3As shown, considering that after the first rectifier mesh 1 rotates, the linear velocities of different first ventilation holes 11 are different along the direction from the center to the edge of the first rectifier mesh 1. The linear velocity of the first ventilation hole 11 closer to the center of the first rectifier mesh 1 is less than that of the first ventilation hole 11 farther from the center of the first rectifier mesh 1. Generally, the ventilation volume of the first ventilation hole 11 with a larger linear velocity is greater than that of the first ventilation hole 11 with a smaller linear velocity. The gradual change in the area of ​​the first ventilation hole 11 and / or the area of ​​the second ventilation hole 21 is designed to balance the ventilation volume of each first ventilation hole 11 in the first rectifier mesh 1 and to balance the ventilation volume of each second ventilation hole 21 in the second ventilation hole 21, so that the air permeability of each rectifier mesh hole is uniform, thereby enhancing the rectification effect and reducing eddy noise. Here, ventilation volume refers to the volume flowing through the fan per unit time.

[0057] Based on the above embodiments, continue to combine Figure 3 As shown, a gear 12 is provided on the edge of the first rectifier mesh 1, and the drive assembly 3 includes a motor 31 and a gear plate 32. The motor 31 is connected to the gear plate 32; the gear plate 32 is driven by the gear 12 of the first rectifier mesh 1.

[0058] Specifically, the drive component 3 consists of a motor 31 and a gear 32. The gear 32 is geared to the gear 12 of the first rectifier mesh 1. The motor 31 drives the gear 32 to rotate a certain number of revolutions. According to the preset transmission ratio between the gear 32 and the first rectifier mesh 1, the gear 32 drives the first rectifier mesh 1 to rotate around the second rectifier mesh 2 by a certain rotation angle with its central axis as the rotation axis. This changes the size of the overlapping area of ​​the first ventilation hole 11 of the first rectifier mesh 1 and the second ventilation hole 21 of the second rectifier mesh 2, thereby dynamically adjusting the size of the rectifier mesh holes.

[0059] Based on the same inventive concept, embodiments of the present invention also provide a range hood, including any of the rectifier devices provided in the above embodiments. Figure 8 This invention provides a schematic diagram of the structure of a range hood;

[0060] Figure 9 yes Figure 8 A schematic diagram of the internal structure of region M. (Combined with...) Figure 8 and Figure 9 As shown, the range hood also includes a fan 100 and a wind pressure detection device (not shown in the figure). The fan 100 is located at the top of the range hood, the rectifier 200 is located at the air inlet of the fan 100, and the wind pressure detection device is located at the air outlet of the fan 100. The wind pressure detection device is used to detect the wind resistance value at the air outlet of the fan 100.

[0061] Currently, range hoods have become an indispensable kitchen appliance in modern homes. The control device of a range hood can consist of software and / or hardware, and can be integrated into the main controller of the range hood. Range hoods operate based on the principles of fluid dynamics, using a centrifugal fan mounted at the top to draw in and exhaust cooking fumes, and a filter to remove some grease particles. The centrifugal fan includes a volute, an impeller installed within the volute, and a motor that drives the impeller. When the impeller rotates, a negative pressure suction is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the volute collects and guides the fumes outdoors.

[0062] Among them, combined Figure 8 and Figure 9 As shown, the fan 100 is the core power system of the range hood. It is generally fixed to the top rear panel of the casing or the fan frame assembly. As an example, in this embodiment, the fan 100 is located at the top of the range hood. The aerodynamic noise of the fan is the main noise source of the range hood, and its distance from the user greatly affects the user experience. This application provides any of the rectifier devices provided in the above embodiments at the fan's air inlet, which can be further combined with the fan's air outlet resistance value. Figure 3 As shown, the relative positions of the first ventilation hole 11 of the first rectifier mesh 1 and the second ventilation hole 21 of the second rectifier mesh 2 within the rectifier device 200 are dynamically adjusted to dynamically adjust the size of the rectifier mesh holes, thereby dynamically adjusting the ventilation volume. When the wind resistance is high, the air intake area of ​​the fan inlet is reduced to enhance the rectification effect, eliminate small-sized eddies, and reduce eddy noise; when the wind resistance is low, the air intake area of ​​the fan inlet is increased to reduce the air intake resistance, achieving better rectification and noise reduction, and improving the automation and intelligence of the range hood.

[0063] Figure 10 This is a schematic diagram of a control method for a range hood provided by the present invention. Based on the same inventive concept, embodiments of the present invention also provide a control method for a range hood, used for rectifying and reducing noise in the range hood. This control method mainly uses any of the rectification devices provided in the above embodiments to dynamically adjust the ventilation volume of the fan inlet according to the wind resistance value of the fan outlet. Combined with... Figures 1-10 As shown, the control method for a range hood provided in this embodiment of the invention includes:

[0064] S101. Obtain the current air resistance value of the range hood fan outlet.

[0065] The wind resistance value refers to the wind pressure of the range hood. When the range hood is working, the air drawn in by the fan flows through the inner cavity of the range hood, resisting the cooking fumes. The unit of wind pressure is usually Pa (kilograms per square centimeter), but Ampa (Pascal, a unit of pressure) and Hpa (Hpa, a unit of pressure) can also be used. Generally speaking, the higher the wind pressure value, the more powerful and efficient the fan, and the better the fan.

[0066] Specifically, a wind pressure detection device is installed at the air outlet of the range hood fan. The wind pressure detection device can be a gas pressure sensor or a pressure sensing circuit, etc., used to detect the wind resistance value at the air outlet of the fan and transmit the detected wind resistance value at the current moment to the control system of the range hood.

[0067] S102. Compare the wind resistance value with the wind resistance threshold.

[0068] Specifically, the range hood's control system compares the received wind resistance value with the wind resistance threshold stored in the system. Based on the relationship between the wind resistance value and the wind resistance threshold, it further combines... Figure 3 As shown, the control drive component 3 drives the first rectifier mesh 1 to rotate clockwise or counterclockwise relative to the second rectifier mesh 2, changing the relative position of the first ventilation hole 11 of the first rectifier mesh 1 and the second ventilation hole 21 of the second rectifier mesh 2, thereby changing the size of the rectifier mesh holes and thus changing the ventilation volume.

[0069] S103. When the wind resistance value is greater than the wind resistance threshold, determine the rotation angle corresponding to the wind resistance threshold.

[0070] S104. Based on the rotation angle, control the first rectifier mesh to rotate relative to the second rectifier mesh to a misaligned position.

[0071] S105. When the wind resistance value is less than or equal to the wind resistance threshold, control the first rectifier net to rotate relative to the second rectifier net to the initial position.

[0072] Different wind resistance thresholds correspond to different rotation angles. The rotation angle refers to the rotation angle by which the first rectifier net 1 rotates clockwise or counterclockwise relative to the second rectifier net 2 to any misaligned position, with the center of the first ventilation hole 11 and the center of the second ventilation hole 21 overlapping as the initial position.

[0073] Specifically, when the current wind resistance value is greater than the wind resistance threshold, the rotation angle θ corresponding to that wind resistance threshold is obtained, combined with 3 and Figure 5 As shown, the control system of the range hood drives the first rectifier mesh 1 to rotate clockwise or counterclockwise relative to the second rectifier mesh 2 to the rotation angle θ, so that the first ventilation hole 11 of the first rectifier mesh 1 and the second ventilation hole 21 of the second rectifier mesh 2 form a preset misalignment position.

[0074] As an example, taking the initial position as a reference, the rotation angle θ = 90° corresponding to the wind resistance threshold is set. When the current wind resistance value is greater than the wind resistance threshold, the wind resistance is relatively high. The first rectifier mesh 1 rotates 90° clockwise or counterclockwise relative to the second rectifier mesh 2. The rectifier mesh openings of the first ventilation hole 11 and the second ventilation hole 21 are minimized, reducing the air intake area of ​​the fan inlet and thus reducing the ventilation volume. This effectively enhances the rectification effect, reduces small-size eddies, and lowers eddy noise. When the current wind resistance value is less than the wind resistance threshold, when the wind resistance is low, taking the initial position as a reference, the drive component 3 drives the first rectifier mesh 1 to rotate 0° or 180° clockwise or counterclockwise relative to the second rectifier mesh 2, returning to the initial position. The rectifier mesh openings of the first ventilation hole 11 of the first rectifier mesh 1 and the second ventilation hole 21 of the second rectifier mesh 2 are maximized, increasing the air intake area of ​​the fan inlet, reducing air intake resistance, and achieving better rectification and noise reduction.

[0075] Based on the above embodiments, the control method for a range hood provided in this embodiment of the invention further includes the following steps before step 101:

[0076] Obtain the current operating level of the range hood and determine the corresponding wind resistance threshold based on the operating level.

[0077] Specifically, since range hoods typically have multiple operating levels, such as standby, low, high, and high-power (or "stir-fry"), each level has a different wind resistance threshold. In some embodiments, the size of the rectifier mesh can be dynamically adjusted based on the wind resistance value at the fan outlet across all operating levels. Considering that range hoods typically require greater airflow to remove kitchen fumes at high and high-power settings, in some embodiments, the size of the rectifier mesh can be dynamically adjusted only at high and high-power settings based on the wind resistance value at the fan outlet, thus achieving noise reduction through rectification.

[0078] As an example, Figure 11 This is a flowchart illustrating a control method for a range hood provided by the present invention. (Combined with...) Figures 1-11 As shown, the control method for a range hood provided in the embodiments of the invention includes:

[0079] S21. Turn on the range hood.

[0080] S22, Gear selection, determine the wind resistance threshold.

[0081] After the range hood is turned on, the control system obtains the current operating level of the range hood and determines the corresponding wind resistance threshold. The operating level of the range hood can be any one of standby mode, low setting, high setting, or high-power mode. A wind resistance threshold is set for high setting and high-power mode, and each wind resistance threshold corresponds to a rotation angle θ.

[0082] S23, Standby mode.

[0083] Specifically, the control system determines that the range hood is in standby mode at the current moment, executes step S31, and the rectifier does not start.

[0084] S24, Activate the weak mode.

[0085] Specifically, the control system determines that the range hood is currently on low speed and executes step S31, in which the rectifier does not start and the first rectifier grid 1 and the second rectifier grid 2 of the rectifier overlap.

[0086] S25, switch to high gear.

[0087] S26. Turn on the stir-fry setting.

[0088] S27. Determine whether the air resistance value of the air outlet is greater than the air resistance threshold. If yes, proceed to S28; if no, proceed to step S31.

[0089] S28. The motor drives the gear plate to rotate a certain number of revolutions. According to the preset transmission ratio, the gear plate drives the first rectifier mesh to rotate relative to the second rectifier mesh by a preset rotation angle.

[0090] Specifically, the control system determines whether the range hood is currently on high or low power (like a stir-fry setting). It then obtains the current air resistance value at the fan outlet and compares it to the air resistance threshold corresponding to the current operating power setting. As an example, combined with... Figure 3 and Figure 5 As shown, if the range hood is in the high-power setting, and the wind resistance value is greater than the wind resistance threshold corresponding to the high-power setting, the motor 31 drives the gear 32 to rotate a certain number of revolutions. According to the preset transmission ratio, the gear 32 drives the first rectifier mesh 1 to rotate relative to the second rectifier mesh 2. The rotation angle θ is the preset rotation angle corresponding to the high-power setting, thereby reducing the size of the rectifier mesh openings, reducing the air intake area of ​​the fan 100, and reducing the ventilation volume. This enhances the rectification effect, reduces the size of eddies, and lowers eddy noise. When the range hood is in the high-stirring setting, the control principle of the rectifier mesh opening size is similar to that of the high-power setting.

[0091] S29. Determine whether the gear has been switched to a weak gear or standby mode. If yes, proceed to step S30; if no, proceed to step S32.

[0092] Specifically, the control system determines whether the range hood has switched to a low setting or standby mode at the current moment. If yes, it executes step S30; if no, it executes step S32.

[0093] S30. The motor drives the gear plate to rotate a certain number of revolutions. According to the preset transmission ratio, the gear plate drives the first rectifier mesh to rotate relative to the second rectifier mesh to the initial position.

[0094] S31, Motor does not start.

[0095] S32. If the range hood is detected to be off, the gear plate drives the first rectifier mesh to rotate relative to the second rectifier mesh to the initial position.

[0096] S33, Cooking complete.

[0097] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Features of various embodiments of the present invention can be partially or wholly coupled or combined with each other, and can cooperate and be technically driven in various ways. Various obvious changes, readjustments, combinations, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A range hood, comprising a rectifier, a fan (100), and a wind pressure detection device, wherein the fan is disposed at the top of the range hood, the rectifier is disposed at the air inlet of the fan, and the wind pressure detection device is disposed at the air outlet of the fan for detecting the wind resistance value of the air outlet of the fan; The rectifier includes a first rectifier grid (1), a second rectifier grid (2), and a drive assembly (3), wherein the first rectifier grid (1) and the second rectifier grid (2) are coaxially arranged; The driving component (3) is in contact with the first rectifier mesh (1), and the driving component (3) is used to drive the first rectifier mesh (1) to rotate relative to the second rectifier mesh (2); The first rectifier mesh (1) includes a plurality of first ventilation holes (11), and the second rectifier mesh (2) includes a plurality of second ventilation holes (21). The effective ventilation diameter of the first ventilation hole (11) is greater than or equal to the effective ventilation diameter of the second ventilation hole (21). Along the air intake direction, the first ventilation hole (11) is a groove, the second ventilation hole (21) is a groove, and the diameter of the air intake end face of the second ventilation hole (21) is greater than the effective ventilation diameter of the first ventilation hole (11), and the depth direction of the groove is consistent with the air intake direction. The first rectifier mesh (1) has a gear (12) set on its edge. The drive assembly (3) includes a motor (31) and a gear plate (32). The motor (31) is connected to the gear plate (32). The gear plate (32) is geared to the first rectifier mesh (1). The driving component (3) is used to drive the first rectifier mesh (1) to rotate clockwise or counterclockwise relative to the second rectifier mesh (2) with its center as the axis of rotation. During the rotation, the first ventilation hole (11) and the second ventilation hole (21) overlap or intersect along the air intake direction. When the wind resistance value is large, the rectifier mesh holes of the first rectifier mesh (1) and the second rectifier mesh (2) are reduced to reduce the ventilation volume. When the wind resistance value is small, the rectifier mesh holes of the first rectifier mesh (1) and the second rectifier mesh (2) are enlarged to increase the ventilation volume. The control system of the range hood compares the received wind resistance value with the wind resistance threshold stored in the system. Based on the relationship between the wind resistance value and the wind resistance threshold, the drive component (3) drives the first rectifier mesh (1) to rotate clockwise or counterclockwise relative to the second rectifier mesh (2).

2. The range hood according to claim 1, characterized in that, All the first ventilation holes (11) are the same size; and / or, all the second ventilation holes (21) are the same size.

3. The range hood according to claim 1, characterized in that, With the center of the first rectifier mesh (1) as the center, a plurality of the first ventilation holes (11) are arranged in a ring around the center of the first rectifier mesh (1); With the center of the second rectifier mesh (2) as the center, a plurality of second ventilation holes (21) are arranged in a ring around the center of the second rectifier mesh.

4. The range hood according to claim 3, characterized in that, The first ventilation holes (11) located on the same ring are equally spaced; the second ventilation holes (21) located on the same ring are equally spaced.

5. The range hood according to claim 1, characterized in that, Along the direction from the center to the edge of the first rectifier mesh (1), the area of ​​the first vent (11) gradually decreases; and / or, along the direction from the center to the edge of the second rectifier mesh (2), the area of ​​the second vent (21) gradually decreases.

6. A control method for a range hood, used to control the range hood according to any one of claims 1-5, characterized in that, The control method includes: Get the current air resistance value of the range hood fan outlet; Compare the wind resistance value with the wind resistance threshold. When the wind resistance value is greater than the wind resistance threshold, determine the rotation angle corresponding to the wind resistance threshold. According to the rotation angle, the first rectifier mesh (1) is controlled to rotate relative to the second rectifier mesh (2) to a misaligned position; wherein, different wind resistance thresholds correspond to different rotation angles; When the wind resistance value is less than or equal to the wind resistance threshold, the first rectifier net (1) is controlled to rotate relative to the second rectifier net (2) to the initial position.

7. The control method according to claim 6, characterized in that, Before obtaining the air resistance value at the current exhaust outlet of the range hood fan, the control method further includes: Obtain the current operating level of the range hood, and determine the corresponding wind resistance threshold based on the operating level; wherein, different operating levels correspond to different wind resistance thresholds.

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