An extractor hood, a noise reduction device and a noise reduction control method

Abstract

The present disclosure relates to a range hood, a noise reduction device and a noise reduction control method. The noise reduction device is arranged in an exhaust cavity of the range hood. A volute is arranged in the exhaust cavity. An air outlet of the volute forms an exhaust air duct with the exhaust cavity. The noise reduction device comprises a reversing structure arranged on one side of the air outlet of the volute. The reversing structure is used to control the flow direction of the exhaust air. The reversing structure comprises a bracket and a guide vane arranged on at least one side of the bracket. The guide vane is an elastic arc surface plate. A regulating plate is rotatably connected to the bottom end of the guide vane. One end of the regulating plate away from the guide vane is movably arranged on the base of the bracket. The regulating plate is used to move the bottom end position of the guide vane to change the arc surface profile of the guide vane. According to the operating conditions of the range hood, the arc surface profile of the guide vane is adjusted to match the exhaust air flow with the operating conditions of the range hood, thereby reducing the airflow impact noise.

Description

Technical Field

[0001] This disclosure relates to the field of range hood technology, and in particular to a range hood, a noise reduction device, and a noise reduction control method. Background Technology

[0002] Range hoods, as a common kitchen appliance, are essential for removing cooking fumes during daily cooking. During operation, a strong unsteady interference exists between the airflow at the vortex outlet and the curved guide vanes on the duct wall, resulting in significant airflow impact noise. To address this noise issue, related technologies employ adjusting the position and structure of the internal fan system to achieve internal airflow stabilization and noise reduction. However, because the fan speed inside the range hood is unstable, and the internal airflow pattern varies under different operating conditions, simply adjusting the fan system's position and structure cannot effectively reduce noise under diverse conditions. Summary of the Invention

[0003] To address at least one of the aforementioned technical problems, this disclosure provides a range hood, a noise reduction device, and a noise reduction control method.

[0004] According to some embodiments of this disclosure, a noise reduction device is provided, disposed in the exhaust chamber of a range hood. A volute is installed inside the exhaust chamber, and the air outlet of the volute forms an exhaust duct with the exhaust chamber. The noise reduction device includes a reversing structure disposed on one side of the air outlet of the volute, and the reversing structure is used to control the flow direction of the exhaust air. The reversing structure includes a bracket and a guide plate mounted on at least one side of the bracket. The guide plate is an elastic arc-shaped panel, and an adjusting plate is rotatably connected to the bottom end of the guide plate. The end of the adjusting plate away from the guide plate is movably mounted on the base of the bracket, and the adjusting plate is used to move the position of the bottom end of the guide plate, thereby changing the arc contour of the guide plate.

[0005] Based on the above solution, the contour of the air guide plate can be changed by adjusting the plate according to the operating conditions of the range hood, so that the exhaust flow of the exhaust duct matches the operating conditions of the range hood, thereby reducing the noise generated by the airflow impacting the air guide plate.

[0006] In some possible implementations, the adjusting plate includes at least two combined plates, adjacent combined plates are hinged together, and each combined plate is provided with a magnet; an electromagnetic control plate is mounted on the base of the bracket, the electromagnetic control plate corresponds to the position of the magnets on the multiple combined plates, the electromagnetic control plate is energized to form a magnetic path area, the magnetic path area attracts the magnets at the corresponding positions to the electromagnetic control plate; an electrical control box is mounted on one side of the bracket, the electrical control box is used to control the movement of the magnetic path area.

[0007] Based on the above scheme, the adjustment plate and the base of the bracket are connected by magnetic force. The electric control box controls the movement of the magnetic path area of ​​the electromagnetic control board, so that different combination plates are attracted to the base of the bracket, and the adjustment plate is installed on the base of the bracket in different shapes.

[0008] In some possible implementations, a pressure sensor is installed on the inner wall of the exhaust duct to detect the pressure in the exhaust duct, and the pressure sensor is communicatively connected to the electrical control box.

[0009] Based on the above scheme, the pressure sensor detects the pressure in the exhaust duct and transmits it to the control box. The control box obtains the operating condition of the range hood based on the pressure in the exhaust duct and controls the electromagnetic control board to adjust the arc contour of the air guide plate. The whole process is an automatic identification, detection and adjustment process, which achieves the effect of automatically adjusting and reducing noise according to the operating condition of the range hood.

[0010] In some possible implementations, the air guide plate has multiple first noise reduction holes, and the opening ratio of the first noise reduction holes on the air guide plate is more than 10%; the area of ​​the first noise reduction holes ranges from 0.5 to 5 mm. 2 .

[0011] Based on the above scheme, an opening design is added to the arc-shaped contour of the air guide plate. When the airflow from the vortex outlet impacts the air guide plate, part of the airflow passes through the first noise reduction hole, thereby effectively reducing the intensity of the airflow impact on the air guide plate and improving the noise reduction effect of the air guide plate.

[0012] In some possible implementations, the adjusting plate has a plurality of second noise reduction holes, and the opening ratio of the second noise reduction holes on the adjusting plate is more than 15%; the area of ​​the second noise reduction holes ranges from 0.5 to 8 mm. 2 .

[0013] Based on the above scheme, the airflow is guided by the air guide plate and then impacts the regulating plate. Part of the impacting airflow passes through the second noise reduction hole, thereby reducing the intensity of the airflow impact on the regulating plate and improving the noise reduction effect of the regulating plate.

[0014] In some possible implementations, the air guide plate has a sandwich layer on the arc surface near the bracket, and the sandwich layer contains sound-absorbing material.

[0015] Based on the above solution, the air guide plate is the part most affected by airflow. Adding sound-absorbing material here will assist in noise reduction. The added layer and the internal sound-absorbing material will not interfere with the airflow, thereby improving the accuracy and effectiveness of noise reduction through passive noise reduction without affecting the aerodynamic performance of the range hood.

[0016] According to some other embodiments of this disclosure, a range hood is provided, including an exhaust chamber, and the range hood further includes a noise reduction device as described in any of the above embodiments, the noise reduction device being disposed in the exhaust chamber.

[0017] According to some other embodiments of this disclosure, a noise reduction control method is provided, applied to a noise reduction device according to any one of the above embodiments, comprising the following steps: detecting the pressure of the exhaust duct in the noise reduction device; establishing a matching relationship between the pressure of the exhaust duct and the operating conditions of the range hood where the noise reduction device is located; and adjusting the profile of the guide plate of the reversing structure in the exhaust duct according to the operating conditions of the range hood, so that the exhaust flow rate of the exhaust duct matches the operating conditions of the range hood.

[0018] Based on the above solution, the operating conditions of the range hood can be automatically identified, and the exhaust flow of the exhaust duct can be adjusted accordingly to reduce the impact of airflow on the air guide plate, thereby achieving adaptive and targeted noise reduction according to the operating conditions of the range hood.

[0019] In some possible implementations, a pressure sensor is installed on the inner wall of the exhaust duct; detecting the pressure of the exhaust duct within the noise reduction device includes detecting the pressure of the exhaust duct using the pressure sensor; establishing a matching relationship between the pressure of the exhaust duct and the operating conditions of the range hood where the noise reduction device is located includes: if the pressure of the exhaust duct is less than a preset threshold, the range hood operates in a low-flow condition; if the pressure of the exhaust duct is equal to the preset threshold, the range hood operates in a low-flow condition; if the pressure of the exhaust duct is greater than the preset threshold, the range hood operates in a high-flow condition.

[0020] Based on the above scheme, matching the operating conditions of the range hood with the pressure of the exhaust duct can avoid inaccurate identification of the operating conditions of the range hood due to fluctuations in the internal fan speed, and significantly reduce identification errors caused by fan speed fluctuations.

[0021] In some possible implementations, the noise reduction device includes an adjustment plate comprising at least two combined plates, each combined plate having a magnet. The base of the noise reduction device is equipped with an electromagnetic control board and an electronic control box. The electromagnetic control board corresponds to the positions of the magnets on the multiple combined plates. The electromagnetic control board is energized to form a magnetic path region, and the electronic control box controls the movement of the magnetic path region. Adjusting the contour of the air guide plate in the reversing structure within the exhaust duct includes: when the range hood operates under low-flow conditions, the electronic control box does not change the magnetic path region of the electromagnetic control board, and the adjustment plate maintains its original state; when the range hood operates under high-flow conditions, the electronic control box controls the magnetic path region of the electromagnetic control board to move a preset distance towards the support, and the moved magnetic path region attracts the corresponding magnet to the electromagnetic control board, causing the combined plate with the magnet to be mounted on the electromagnetic control board, and the adjustment plate lowers the bottom position of the air guide plate.

[0022] Based on the above scheme, the combined plate form allows the adjustment range of the adjustment plate to be adaptively adjusted. By controlling the magnetic path area of ​​the electromagnetic control plate through preset stroke, the shape adjustment of the adjustment plate can be more accurate. At the same time, it can also avoid abrupt changes in the arc contour of the air guide plate caused by large changes in the adjustment plate, thus achieving a flexible noise reduction effect.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure.

[0024] Implementing this disclosure will have the following beneficial effects:

[0025] This invention allows for the adjustment of the air guide plate's profile based on the range hood's operating conditions, thereby matching the exhaust flow rate of the exhaust duct with the range hood's operating conditions and reducing the noise generated by the airflow impacting the air guide plate.

[0026] Other features and aspects of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions and advantages in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a noise reduction device according to an embodiment of the present disclosure is shown;

[0029] Figure 2 A schematic diagram of the exhaust pipe of a noise reduction device according to an embodiment of the present disclosure is shown;

[0030] Figure 3 A schematic diagram showing the commutation structure of a noise reduction device according to an embodiment of the present disclosure is shown;

[0031] Figure 4 A schematic diagram showing another embodiment of the commutation structure of the noise reduction device according to an embodiment of the present disclosure;

[0032] Figure 5 A schematic diagram of the adjustment plate of a noise reduction device according to an embodiment of the present disclosure is shown;

[0033] Figure 6 A schematic diagram of the electromagnetic control board of a noise reduction device according to an embodiment of the present disclosure is shown;

[0034] Figure 7 A schematic diagram of the first noise reduction hole of the adjustment plate according to an embodiment of the present disclosure is shown;

[0035] Figure 8 A schematic diagram of the first noise reduction hole of the adjustment plate according to an embodiment of the present disclosure is shown;

[0036] Figure 9 A flowchart of a noise reduction control method according to an embodiment of the present disclosure is shown.

[0037] In the picture:

[0038] 1-Reversing structure; 11-Bracket; 12-Air guide plate; 2-Adjusting plate; 21-Combination plate; 211-Magnet; 3-Electromagnetic control plate; 4-Electrical control box; 5-First noise reduction hole; 6-Second noise reduction hole. Detailed Implementation

[0039] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0040] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0041] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0042] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0043] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0044] Furthermore, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that this disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of this disclosure.

[0045] Typically, in range hoods and integrated cooktops that include range hoods, during operation, the airflow at the volute outlet of the internal fan experiences strong unsteady interference with the curved guide vanes on the duct wall, resulting in significant airflow impact noise from the curved guide vanes. Improving the design of the curved guide vanes and optimizing the duct can not only improve the aerodynamic performance of the fan but also reduce noise.

[0046] In related technologies, the proper placement of the fan system, such as using a single-suction fan system, a dual-suction fan system, tilting the fan system, or adding sound-absorbing cotton at the fan inlet or corner areas, is employed to achieve stable internal airflow and noise reduction in the range hood. However, low-suction range hoods, due to their narrow and elongated inlet, experience diffusion losses and unstable turbulence from the inlet to the fan housing. This unstable turbulence periodically impacts the impeller, causing significant fluctuations in motor speed, which in turn leads to the range hood switching between different power levels under back pressure conditions for users on different floors. For range hoods or integrated cooktops with left and right exhaust structures, it is required that the airflow from the left and right exhaust outlets be the same under the same power setting. However, achieving equal airflow from the left and right exhaust outlets without changing the fan structure and installation position is very difficult. Therefore, optimizing the fan system cannot completely solve the problems of unstable motor speed and unequal airflow from the left and right exhaust outlets, nor can it effectively reduce the noise caused by these two factors. Therefore, the flow patterns inside a range hood differ under different operating conditions (flow rates). How to adopt targeted noise reduction measures based on the operating conditions of the range hood is a problem that needs to be solved.

[0047] To address the aforementioned problems, this disclosure provides a noise reduction device that can be installed in the exhaust chamber of a range hood. The device adjusts the exhaust flow rate of the range hood to match its operating conditions. The operating conditions of the range hood are defined as the flow rate generated by the fan inside the hood. In other words, the noise reduction device reduces excess airflow accumulation and thus lowers the noise generated by airflow impact by adjusting the exhaust flow rate to match the flow rate generated by the fan.

[0048] In the embodiments disclosed herein, the term "range hood" should be interpreted broadly, encompassing not only kitchen appliances such as range hoods, but also any device that includes structural components for a range hood and objectively performs the function of a range hood, such as integrated cooktops and industrial exhaust systems.

[0049] The noise reduction device in this embodiment includes a commutation structure 1. Please refer to... Figure 1 The reversing structure 1 is located on one side of the air outlet of the volute and is used to control the direction of the exhaust airflow. The direction of the airflow blown out of the air outlet of the volute is not consistent with the direction of the final exhaust of the range hood, that is, the air outlet of the volute is not directly connected to the exhaust pipe of the range hood, and the reversing structure 1 is used to guide the airflow blown out of the volute to the exhaust port of the range hood.

[0050] In some embodiments, please refer to Figure 2The range hood has a left-right exhaust structure, meaning that there is an exhaust pipe running through the left and right directions inside the range hood. The direction of the airflow blown out of the volute is perpendicular to the length of the exhaust pipe. The airflow blown out of the volute is guided to the left and / or right by the arc surface of the reversing structure 1.

[0051] Please refer to Figure 3 The reversing structure 1 includes a bracket 11 and an air guide plate 12 installed on at least one side of the bracket 11. The air guide plate 12 is an elastic arc panel. An adjustment plate 2 is rotatably connected to the bottom end of the air guide plate 12. The end of the adjustment plate 2 away from the air guide plate 12 is movably installed on the base of the bracket 11. The adjustment plate 2 is used to move the bottom position of the air guide plate 12 so that the arc profile of the air guide plate 12 changes.

[0052] In this embodiment, the air guide plate 12 of the reversing structure 1 can be installed on only one side. When the range hood is configured to exhaust from the left (default), the reversing structure 1 is located on the right side of the volute's air outlet. In this case, only the left air guide plate 12 can be installed, and the airflow from the volute passes through the air guide plate 12 and ultimately exits from the left air outlet. Similarly, when the range hood is configured to exhaust from the right (default), the reversing structure 1 is located on the left side of the volute's air outlet. In this case, only the right air guide plate 12 can be installed, and the airflow from the volute passes through the air guide plate 12 and ultimately exits from the right air outlet.

[0053] In one specific implementation, please refer to Figure 4 Both sides of the bracket 11 are equipped with air guide plates 12. Based on this design, when installing a dual-exhaust range hood, users can freely choose to have the exhaust on the left or right side depending on the kitchen layout. During operation, it is only necessary to move the reversing structure 1 from one side of the exhaust port of the volute to the other side, which reduces the number of steps required to reassemble the reversing structure 1, improves the compatibility of the range hood, reduces the number of product accessories, and has the advantage of saving costs.

[0054] In one possible implementation, air guide plates 12 are installed on both sides of the bracket 11, and the reversing structure 1 is installed directly opposite the air outlet of the volute. The airflow from the volute outlet is split into two airflows by the reversing structure 1, which flow out from the left and right air outlets of the range hood respectively. Based on this design, the range hood can simultaneously output air from both sides, and the air guide plates 12 on both sides of the bracket 11 can be adjusted to have an adjustable arc profile, so the airflow on both sides can be adjusted to be consistent, thereby achieving a noise reduction effect.

[0055] In this embodiment, the purpose of movably mounting the adjustment plate 2 on the base of the bracket 11 is that the adjustment plate 2 has different mounting configurations, and the shape of the adjustment plate 2 is different for each mounting configuration. Since one end of the adjustment plate 2 is connected to the air guide plate 12, the connection position between the adjustment plate 2 and the air guide plate 12 is also different in different mounting configurations, and the other end of the air guide plate 12 is fixedly connected to the top of the bracket 11. Therefore, the arcuate profile deformation of the air guide plate 12 is controlled by the connection position between the air guide plate 12 and the adjustment plate 2, that is, the bottom position of the air guide plate 12.

[0056] In some embodiments of this disclosure, the trajectory of the bottom position of the air guide plate 12 can be a regular straight line, a regular curve, an irregular curve, or a combination of curves. That is, the bottom position of the air guide plate 12 can move and change in three dimensions: front and back, left and right, and up and down. The movement and change can be carried out in only one dimension or in multiple dimensions simultaneously.

[0057] In one specific embodiment, please refer to Figure 5 The adjusting plate 2 includes at least two combined plates 21, adjacent combined plates 21 are hinged together, and each combined plate 21 is provided with a magnet 211; please refer to Figure 6 An electromagnetic control board 3 is installed on the base of the bracket 11. The electromagnetic control board 3 corresponds to the position of the magnets 211 on the multiple combination plates 21. When the electromagnetic control board 3 is energized, a magnetic path area is formed. The magnetic path area attracts the magnets 211 at the corresponding positions to the electromagnetic control board 3. An electric control box 4 is installed on the bracket 11. The electric control box 4 is used to control the movement of the magnetic path area.

[0058] In the above embodiments, the electrical control box 4 can be installed on the base of the bracket 11 or on one side of the bracket 11. When the electrical control box 4 is installed on one side of the bracket 11, the internal structure of the reversing structure 1 can be simplified, the internal space of the reversing structure 1 can be used reasonably, interference can be avoided, and the air guide plate 12 can be guaranteed to have a good air guiding effect. At the same time, the electrical control box 4 is located on one side of the bracket 11, which also facilitates the subsequent troubleshooting and maintenance of the electrical control box 4 and the electromagnetic control board 3.

[0059] In the above embodiment, when the adjustment plate 2 is in the initial state, the combined plate 21 farthest from the air guide plate 12 is adsorbed on the electromagnetic control plate 3, and the remaining combined plates 21 are in a suspended state. The more combined plates 21 there are, the closer the side contour line of the combined plates 21 is to the vertical line, and the smoother the connection between the adjustment plate 2 and the air guide plate 12 is. When the airflow is guided to the adjustment plate 2 by the air guide plate 12, it will not be impacted by the sudden change in airflow. The adjustment plate 2 also makes the adjustment of the arc contour of the air guide plate 12 more stable and will not cause the arc shape to change suddenly, thereby avoiding new airflow impact.

[0060] In the above embodiments, the electronic control box 4 controls the movement of the magnetic path region. The movement of the magnetic path region can be a fixed-length movement, that is, the length of the magnetic path region is fixed, and the starting line and the ending line of the magnetic path region move simultaneously each time it moves; the movement of the magnetic path region can also be an extended movement, that is, the starting line of the magnetic path region is fixed, and the ending line of the magnetic path region moves each time it moves.

[0061] Based on the above embodiments, the moving magnetic path area attracts the corresponding magnet 211 to the electromagnetic control board 3, thereby changing the state of the adjustment plate 2 installed on the base. When the range hood is in the left exhaust state, the state of the adjustment plate 2 changes, causing the bottom position of the air guide plate 12 to move downward and to the right, thereby continuously increasing the radius of curvature of the arc surface of the air guide plate 12, and achieving the effect of increasing the exhaust flow of the exhaust duct.

[0062] In one specific embodiment, the adjusting plate 2 is slidably mounted on the base of the bracket 11. A left-right guide rail is mounted on the base of the bracket 11, and a slider is slidably mounted on the guide rail. The adjusting plate 2 is mounted on the slider. The adjusting plate 2 moves left-right via the slider and guide rail, thereby controlling the displacement of the bottom position of the air guide plate 12 in the left-right direction. When the adjusting plate 2 moves closer to the bracket 11, the bottom position of the air guide plate 12 also moves closer to the bracket 11, the radius of curvature of the air guide plate 12 continuously increases, and the exhaust flow rate of the exhaust duct increases accordingly.

[0063] In some embodiments of this disclosure, a pressure sensor is installed on the inner wall of the exhaust duct. The pressure sensor is used to detect the pressure in the exhaust duct and is communicatively connected to the electronic control box 4. Based on the above scheme, the pressure sensor detects the pressure in the exhaust duct and transmits it to the electronic control box 4. The electronic control box 4 obtains the operating condition of the range hood based on the pressure in the exhaust duct and controls the electromagnetic control board 3 to adjust the arc contour of the air guide plate 12. The whole process is an automatic identification, detection, and adjustment process, achieving the effect of automatic noise reduction adjustment according to the operating condition of the range hood.

[0064] In the above embodiments, the pressure sensor should be interpreted broadly. It can be a sensor device or a device, apparatus or component with pressure sensor function, that is, a device, apparatus or component that can detect gas pressure, such as a barometer, pressure gauge, mechanical encoder, etc.

[0065] In some embodiments of this disclosure, please refer to Figure 7The air guide plate 12 can have multiple first noise reduction holes 5. The air guide plate 12 is located at the position with the largest impact area of ​​the airflow at the volute outlet, and also at the position with the strongest airflow impact. The function of opening the first noise reduction holes 5 is to buffer part of the impacting airflow, thereby weakening the overall airflow impact intensity. The requirement for opening the first noise reduction holes 5 is that the opening ratio of the first noise reduction holes 5 on the air guide plate 12 is above 10%; otherwise, the first noise reduction holes 5 will not achieve the noise reduction effect. Furthermore, adjacent first noise reduction holes 5 cannot be connected; otherwise, the air guide plate 12 will lose its airflow guiding function. The opening of the first noise reduction holes 5 should be selected based on the actual airflow conditions at the volute outlet and the specific shape of the air guide plate 12, selecting the uniformity of the hole distribution. That is, the first noise reduction holes 5 can be evenly distributed or unevenly distributed, such as setting the hole density according to the location of the airflow impact intensity. To balance the noise reduction coefficient and the airflow guiding effect of the air guide plate 12, the area range of the first noise reduction holes 5 should be set between 0.5 and 5 mm. 2 The opening shape of the first noise reduction hole 5 can be a triangle, quadrilateral, circle, other regular polygons, irregular closed shapes, etc. In order to reduce the difficulty of the manufacturing process, the first noise reduction hole 5 can be selected as a circular opening, with a corresponding diameter of 1-2.5mm.

[0066] In some embodiments of this disclosure, please refer to Figure 8 The regulating plate 2 has multiple second noise reduction holes 6. The regulating plate 2 is connected to the air guide plate 12. Because the contour of the regulating plate 2 is not a standard curved surface, when the airflow is guided from the air guide plate 12 to the regulating plate 2, a new airflow impact will be generated. To reduce the noise of this airflow impact, the regulating plate 2 needs to be perforated. The requirements for the second noise reduction holes 6 are that the opening ratio of the second noise reduction holes 6 on the regulating plate 2 is above 15%, and adjacent second noise reduction holes 6 cannot be connected. The opening density of the first noise reduction holes 5 should be reasonably selected based on the noise reduction effect, either uniformly or non-uniformly distributed. To achieve an effective noise reduction coefficient, the area range of the second noise reduction holes 6 should be set between 0.5 and 8 mm. 2 The shape of the second noise reduction hole 6 can be a triangle, quadrilateral, circle, other regular polygons, or irregular closed shapes. To reduce the difficulty of the manufacturing process, the second noise reduction hole 6 can be a circular hole with a diameter of 1-3mm. When the second noise reduction hole 6 is a circular hole with a diameter of 2.5mm, the noise reduction effect is the best.

[0067] In some embodiments of this disclosure, the air guide plate 12 is provided with a sandwich layer containing sound-absorbing material. The air guide plate 12 is the location most affected by the airflow from the volute. Although the curved surface of the air guide plate 12 has a passive noise reduction function, sound-absorbing material is added here to further improve the noise reduction effect. To ensure that the added sandwich layer and the internal sound-absorbing material do not directly contact the airflow, the sandwich layer is positioned on the curved surface of the air guide plate 12 near the support 11. In this case, the sandwich layer and the internal sound-absorbing material will not interfere with the airflow, improving the noise reduction effect without significantly affecting the aerodynamic performance of the fan. The sandwich layer can be a full coverage layer, meaning the area and shape of the sandwich layer are consistent with the entire air guide plate 12; or the sandwich layer can be precisely positioned, meaning it is installed at the location on the air guide plate 12 where the airflow impact intensity is greatest, achieving precise noise reduction. The principle of sound-absorbing materials is that when sound enters the material surface, part of the sound energy is reflected, part penetrates the material, and the remaining part is converted into heat energy due to the vibration of the component material or friction between the sound and the medium during propagation, thus being lost; that is, the sound is absorbed by the material. In the above embodiments, the sound-absorbing material can be a porous material, a resonant material, or a material with a special structure. To reduce costs, the sound-absorbing material can be selected as a porous material such as sound-absorbing cotton or foam plastic.

[0068] The embodiments of this disclosure also provide a range hood, which includes an exhaust chamber and a noise reduction device as described in any of the above embodiments, the noise reduction device being disposed in the exhaust chamber.

[0069] The embodiments of this disclosure also provide a noise reduction control method, which is applied to the noise reduction device described in any of the above embodiments. The method first determines the operating condition of the range hood, that is, analyzes the flow rate of the fan inside the range hood, and then adjusts the flow rate of the exhaust duct inside the range hood according to the operating condition, so that the flow rate of the exhaust duct corresponds to the flow rate generated by the fan, thereby avoiding excess airflow from accumulating inside the range hood, reducing airflow impact, and lowering noise.

[0070] In the above embodiments, the operating conditions of the range hood can be directly obtained from the internal fan drive controller. However, due to factors such as the user's floor level, installation location, and ambient temperature and humidity, the fan speed will fluctuate significantly during actual operation. Furthermore, the structural design of the fan's air inlet can also lead to greater speed fluctuations. Therefore, the operating parameters of the range hood obtained directly from the fan drive controller are inaccurate.

[0071] Please refer to Figure 9 The flowchart of a noise reduction control method provided in this embodiment of the present disclosure is shown. The method includes:

[0072] S101. Detect the pressure of the exhaust duct inside the noise reduction device.

[0073] In this embodiment, the pressure in the exhaust duct is closely related to the flow rate of the fan during operation, and the noise from the airflow impact also reflects the pressure in the exhaust duct. Indirectly determining the operating parameters of the range hood by detecting the exhaust duct pressure is more accurate than directly obtaining these parameters from the fan's drive controller. Furthermore, when the fan speed fluctuates, the exhaust duct pressure provides direct feedback, while parameters obtained from the fan's drive controller are normally relatively stable. Therefore, detecting the exhaust duct pressure, compared to obtaining parameters from the fan's drive controller, provides a more sensitive perception of changes in the range hood's operating conditions and fan speed fluctuations, enabling faster detection and response to these changes, thus significantly improving the timeliness of noise reduction adjustments.

[0074] S102. Establish a matching relationship between the pressure of the exhaust duct and the operating conditions of the range hood where the noise reduction device is located.

[0075] In some possible embodiments, the range hood is operated at different flow rates. At each flow rate, the pressure of the exhaust duct is measured multiple times to obtain the maximum, minimum, and average values ​​of the pressure parameters of the exhaust duct at the corresponding flow rate. One or more of the pressure parameters are selected as reference values ​​to establish a matching relationship between the pressure of the exhaust duct and the operating conditions of the range hood.

[0076] In some possible embodiments, the range hood is continuously operated by changing gears. During the gear changing process, the pressure of the exhaust duct is maintained within a set range, such as 240±10Pa, 260±10Pa, 280±10Pa, and 3000±10Pa. The range of gears of the range hood (or the flow range of the fan) corresponding to each pressure range is recorded to establish a matching relationship between the pressure of the exhaust duct and the operating conditions of the range hood.

[0077] In this embodiment, the above-mentioned matching relationship between the pressure of the exhaust duct and the operating conditions of the range hood where the noise reduction device is located is not limited to the way the pressure of the exhaust duct and the operating conditions of the range hood are represented. That is, the pressure of the exhaust duct can be a specific parameter value and parameter range, or it can be the pressure state corresponding to a parameter range defined by the user. Similarly, the operating conditions of the range hood can be the specific electrical parameters of the fan or the speed parameters of the fan, or it can be the gear position on the control panel of the range hood or other manually set parameters.

[0078] In this embodiment, the establishment of the matching relationship between the pressure of the exhaust duct and the operating conditions of the range hood where the noise reduction device is located is not limited to a specific method for establishing the matching relationship. That is, the matching relationship can be obtained by manually recording data through experiments and defining settings based on the data, or it can be the result of a computer program or algorithm. For example, the matching relationship between the pressure parameters of the exhaust duct and the flow parameters generated by the fan can be established through a classification algorithm; the matching relationship between the pressure parameters of the exhaust duct and the operating level of the range hood can be established through a fuzzy algorithm; and the fitting curve between the pressure parameters of the exhaust duct and the flow parameters generated by the fan can be established through a neural network algorithm. In other words, the complexity of the matching relationship and the method of establishing the matching relationship can be reasonably derived from the content of this disclosure embodiment without creative activity.

[0079] S103. Adjust the profile of the air guide plate 12 of the reversing structure 1 in the exhaust duct according to the operating conditions of the range hood, so that the exhaust flow of the exhaust duct matches the operating conditions of the range hood.

[0080] In this embodiment, adjusting the contour of the air guide plate 12 can increase the cross-sectional density of the exhaust flow rate and reduce the impact of the exhaust on the air guide plate 12, thereby achieving the effect of noise reduction.

[0081] In this embodiment, the method of adjusting the contour of the air guide plate 12 is not limited. Any operation that can change the contour of the air guide plate 12 can be applied to the noise reduction control method of this embodiment. For example, the adjustment method can be manual adjustment by the user, or adjustment can be achieved by mechanical structures such as air pumps or oil pumps, or adjustment can be achieved by electrical devices such as motors, electromagnets 211, and switches.

[0082] In one specific embodiment, a pressure sensor is installed on the inner wall of the exhaust duct. The aforementioned detection of the pressure in the exhaust duct within the noise reduction device includes detecting the pressure in the exhaust duct using the pressure sensor. In this embodiment, the pressure sensor can be any device capable of detecting the pressure in the exhaust duct within the noise reduction device, including not only sensors but also devices such as barometers, pressure gauges, and encoders.

[0083] In one specific embodiment, the above-mentioned matching relationship between the pressure of the exhaust duct and the operating conditions of the range hood where the noise reduction device is located includes: if the pressure of the exhaust duct is less than a preset threshold, the operating condition of the range hood is a low-flow condition; if the pressure of the exhaust duct is equal to the preset threshold, the operating condition of the range hood is a low-flow condition; if the pressure of the exhaust duct is greater than the preset threshold, the operating condition of the range hood is a high-flow condition.

[0084] In the above embodiments, the preset threshold is a parameter value defined by humans, and the preset threshold is not fixed and can be flexibly adjusted according to actual needs.

[0085] In one possible implementation, the range hood where the noise reduction device is located has two default settings: a strong wind setting and a weak wind setting. In this case, the preset threshold is set to 280Pa. That is, when the pressure value of the exhaust duct is less than or equal to 280Pa, the range hood operates in a low-flow condition, corresponding to the weak wind setting; when the pressure of the exhaust duct is greater than 280Pa, the range hood operates in a high-flow condition, corresponding to the strong wind setting.

[0086] In one possible implementation, the range hood where the noise reduction device is located has three default settings: low, medium, and high. In this case, the preset threshold is set to 300Pa. That is, when the pressure of the exhaust duct is less than or equal to 300Pa, the range hood operates in a low-flow condition, corresponding to the low and medium settings; when the pressure of the exhaust duct is greater than 300Pa, the range hood operates in a high-flow condition, corresponding to the high setting.

[0087] In one specific embodiment, the noise reduction device includes an adjustment plate 2, which includes at least two combined plates 21, each of which is provided with a magnet 211. The base of the noise reduction device is equipped with an electromagnetic control plate 3 and an electrical control box 4. The electromagnetic control plate 3 corresponds to the position of the magnets 211 on the multiple combined plates 21. When the electromagnetic control plate 3 is energized, it forms a magnetic path area. The electrical control box 4 is used to control the movement of the magnetic path area. The above-mentioned adjustment of the outline of the guide plate 12 of the reversing structure 1 in the exhaust duct includes the following: when the range hood is operating under low flow conditions, the electrical control box 4 does not change the magnetic path area of ​​the electromagnetic control plate 3, and the adjustment plate 2 maintains its original state; when the range hood is operating under high flow conditions, the electrical control box 4 controls the magnetic path area of ​​the electromagnetic control plate 3 to move a preset stroke toward the support 11. After the magnetic path area moves, the corresponding magnet 211 is attracted to the electromagnetic control plate 3, so that the combined plate 21 with the magnet 211 is installed on the electromagnetic control plate 3, and the adjustment plate 2 lowers the bottom position of the guide plate 12.

[0088] In the above embodiments, the movement of the magnetic path region can be a fixed-length movement, that is, the length of the magnetic path region is fixed, and the starting line and the ending line of the magnetic path region move simultaneously each time it moves; the movement of the magnetic path region can also be an extended movement, that is, the starting line of the magnetic path region is fixed, and the ending line of the magnetic path region moves each time it moves.

[0089] In the above embodiments, the preset travel distance of the magnetic path region is related to the size of the combination plate 21. The smaller the width of the combination plate 21, the smaller the minimum value of the preset travel distance of the magnetic path region. The size of the combination plate 21 is affected by the number of combination plates 21. The more combination plates 21 an adjustment plate 2 of the same area includes, the smaller the width of each combination plate 21, and the smaller the value of the preset travel distance of the corresponding magnetic path region. The adjustment range of the adjustment plate 2 in the installation state on the base becomes smaller, and the corresponding change range of the outline of the air guide plate 12 also becomes smaller. Based on the above solution, the situation where the outline of the air guide plate 12 changes abruptly and generates additional noise can be effectively avoided, and the accuracy of the outline of the air guide plate 12 can also be improved.

[0090] In the above embodiment, to further achieve adaptive noise reduction, after the control box 4 controls the magnetic path area to complete a preset stroke, the control box 4 starts at regular intervals and compares the pressure parameters of the exhaust duct transmitted by the pressure sensor with a preset threshold to determine the current operating condition of the range hood. When the range hood stops running, the control box 4 controls the magnetic path area of ​​the electromagnetic control board 3 to return to its initial position.

[0091] In one possible implementation, the electronic control box 4 can communicate with the control panel of the range hood. The user can communicate with the control panel of the range hood through an electronic device terminal. The user can manually set the above-mentioned preset threshold, preset travel, time and frequency of timed start-up, and other parameters.

[0092] In some possible embodiments, the electronic control box 4 is provided with at least one processor and a memory that is communicatively connected to the at least one processor. The memory stores instructions that can be executed by the at least one processor. The at least one processor implements a noise reduction control method as described in any of the above embodiments by executing the instructions stored in the memory.

[0093] In one specific embodiment, the adjustment plate 2 includes three combined plates 21. The magnetic passage area moves by extension. When the range hood is in high flow condition, the electric control box 4 controls the magnetic passage area of ​​the electromagnetic control plate 3 to move towards the support 11 by a preset stroke. The length of the preset stroke is 2mm.

[0094] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A noise reduction device, disposed in the exhaust chamber of a range hood, characterized in that, A volute is installed inside the exhaust chamber, and the air outlet of the volute forms an exhaust duct with the exhaust chamber. The noise reduction device is used to adjust the exhaust flow of the range hood so that the exhaust flow matches the operating conditions of the range hood. The noise reduction device includes a reversing structure (1), which is disposed on one side of the air outlet of the volute and is used to control the flow direction of the exhaust air. The reversing structure (1) includes a bracket (11) and an air guide plate (12) installed on at least one side of the bracket (11). The air guide plate (12) is an elastic arc panel. An adjusting plate (2) is rotatably connected to the bottom end of the air guide plate (12). The end of the adjusting plate (2) away from the air guide plate (12) is movably installed on the base of the bracket (11). The adjusting plate (2) is used to move the bottom position of the air guide plate (12) so that the arc profile of the air guide plate (12) changes. The adjustment plate (2) includes at least two combined plates (21), adjacent combined plates (21) are hinged together, and each combined plate (21) is provided with a magnet (211). An electromagnetic control board (3) is installed on the base of the bracket (11). The electromagnetic control board (3) corresponds to the position of the magnet (211) on the multiple combination plates (21). When the electromagnetic control board (3) is energized, a magnetic path area is formed. The magnetic path area attracts the magnet (211) at the corresponding position to the electromagnetic control board (3). An electrical control box (4) is installed on one side of the bracket (11), and the electrical control box (4) is used to control the movement of the magnetic passage area.

2. The noise reduction device according to claim 1, characterized in that, A pressure sensor is installed on the inner wall of the exhaust duct. The pressure sensor is used to detect the pressure of the exhaust duct and is communicatively connected to the electrical control box (4).

3. The noise reduction device according to claim 1, characterized in that, The air guide plate (12) has multiple first noise reduction holes (5), and the opening ratio of the first noise reduction holes (5) on the air guide plate (12) is more than 10%; the area of ​​the first noise reduction holes (5) is 0.5~5mm. 2 .

4. The noise reduction device according to claim 1, characterized in that, The adjusting plate (2) has multiple second noise reduction holes (6), and the opening ratio of the second noise reduction holes (6) on the adjusting plate (2) is more than 15%; the area of ​​the second noise reduction holes (6) ranges from 0.5 to 8 mm. 2 .

5. A noise reduction device according to claim 1, characterized in that, The air guide plate (12) has a sandwich layer on its arc surface near the bracket (11), and the sandwich layer contains sound-absorbing material.

6. A range hood, comprising an exhaust chamber, characterized in that, The range hood further includes a noise reduction device as described in any one of claims 1-5, wherein the noise reduction device is disposed in the exhaust chamber.

7. A noise reduction control method, applied in a noise reduction device according to any one of claims 1-5, characterized in that, Includes the following steps: Detect the pressure in the exhaust duct of the noise reduction device; Establish a matching relationship between the pressure of the exhaust duct and the operating conditions of the range hood where the noise reduction device is located; According to the operating conditions of the range hood, adjust the profile of the guide plate (12) of the reversing structure (1) in the exhaust duct so that the exhaust flow rate of the exhaust duct matches the operating conditions of the range hood.

8. The noise reduction control method according to claim 7, characterized in that, A pressure sensor is installed on the inner wall of the exhaust duct; The step of detecting the pressure of the exhaust duct in the noise reduction device includes detecting the pressure of the exhaust duct through the pressure sensor. The establishment of a matching relationship between the pressure of the exhaust duct and the operating conditions of the range hood where the noise reduction device is located includes, If the pressure in the exhaust duct is less than a preset threshold, the range hood will operate under low flow conditions. If the pressure in the exhaust duct is equal to a preset threshold, the range hood operates under low flow conditions. If the pressure in the exhaust duct is greater than a preset threshold, the range hood will operate under high flow rate conditions.

9. The noise reduction control method according to claim 7, characterized in that, The noise reduction device includes an adjustment plate (2), which includes at least two combination plates (21), and each combination plate (21) is provided with a magnet (211). The base of the noise reduction device is equipped with an electromagnetic control board (3) and an electrical control box (4). The electromagnetic control board (3) corresponds to the position of the magnets (211) on the multiple combination plates (21). The electromagnetic control board (3) is energized to form a magnetic path area. The electrical control box (4) is used to control the movement of the magnetic path area. The adjustment of the profile of the guide plate (12) of the reversing structure (1) in the exhaust duct includes the following: when the range hood is in a low flow condition, the electric control box (4) does not change the magnetic path area of ​​the electromagnetic control board (3), and the adjustment plate (2) maintains its original state. When the range hood is in high-flow operating condition, the electrical control box (4) controls the magnetic path area of ​​the electromagnetic control board (3) to move a preset stroke toward the support (11). After the magnetic path area moves, the corresponding magnet (211) is attracted to the electromagnetic control board (3), so that the combination plate (21) with the magnet (211) installed is installed on the electromagnetic control board (3), and the adjustment plate (2) pulls down the bottom position of the air guide plate (12).

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