Sound guide device and range hood

Abstract

The present invention discloses a sound guide device for a range hood, comprising a mounting base, wherein the mounting base comprises a cavity, wherein a plurality of sound guide plates are provided in the cavity, wherein the plurality of sound guide plates divide the cavity into a plurality of sound guide channels, wherein the sound guide channels comprise a depth and a width, and wherein the ratio of the depth to the width of the sound guide channels is not less than 1. Studies have shown that the noise of a range hood is concentrated in the mid- and high-frequency bands above 500 Hz. The wavelength of noise in this band is relatively short, and like short-frequency waves such as light waves, it has a certain directionality in nature. The present invention uses a plurality of sparse but deep sound guide plates to restrain the noise emitted from the range hood's air intake (the main route for noise to be transmitted into the room during actual use). The sound guide plates propagate the sound waves in the mid- and high-frequency bands in a directionally directed manner so that they are not directly directed toward the human ear, thereby reducing the noise intensity received by the human ear and improving people's user experience.

Description

Technical Field

[0001] The present invention relates to the field of household appliances, in particular to range hoods. Background Art

[0002] Range hoods have become a common household appliance in my country, removing cooking fumes and maintaining kitchen cleanliness and human health. However, the use of range hoods has become a challenge: the high noise levels generated by the fans. Long-term exposure to this noise can cause headaches, irritability, and anxiety in housewives and kitchen operators, seriously impacting their health. Therefore, the design of quiet range hoods has become a major concern for manufacturers.

[0003] The noise reduction measures commonly used to reduce noise include noise reduction at the sound source, noise reduction during the propagation process, or active noise reduction technology. Noise reduction at the sound source mainly involves optimizing the internal flow field structure, such as the air duct. This can be achieved by modifying the front radius of the fan volute, increasing the gap between the outer edge of the centrifugal fan impeller and the centrifugal fan volute, or adopting an inclined design for the centrifugal fan volute. However, these methods have poor versatility and structural adaptability, requiring matching with different external flow field structures. They are only applicable to specific products or products in the same series, and are not very versatile. Noise reduction during propagation mainly involves adding sound-absorbing cotton or mufflers to the range hood. However, after long-term use, the sound-absorbing cotton loses its noise reduction effect due to grease absorption, resulting in low durability and fire hazards. Mufflers are expensive, increase duct resistance, and reduce air volume. For active noise reduction in range hoods, the most common practice is to place an active noise reduction device inside the range hood. However, in actual use, the internal cavity of the range hood is affected by oil smoke, creating a very harsh environment. Noise reduction devices exposed to the oil smoke environment will be corroded by high-temperature oil, affecting the service life of the noise reduction device and system stability. At the same time, the cost of active noise reduction devices is relatively high. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a noise reduction device which has a simple structure and can effectively reduce the impact of the noise of the range hood on the human body.

[0005] The solution of the present invention to its technical problem is: a sound guide device for a range hood, comprising a mounting base, the mounting base comprising a cavity, a plurality of sound guide plates being provided in the cavity, the plurality of sound guide plates dividing the cavity into a plurality of sound guide channels, the sound guide channels comprising a depth and a width, the depth to width ratio of the sound guide channels being not less than 1.

[0006] The beneficial effect of the present invention is as follows: research has found that the noise of the range hood is concentrated in the medium and high frequency bands above 500HZ. The wavelength of this noise is relatively short, and like short-frequency waves such as light waves, it has a certain directionality in nature. The present invention uses multiple sparse but deep sound guide plates to restrain the noise transmitted from the range hood suction port (the main way for noise to be transmitted into the room during actual use). The sound guide plates propagate the sound waves in the medium and high frequency bands in a direction so that they are not directly emitted to the human ear, thereby reducing the noise intensity received by the human ear and improving people's user experience.

[0007] As a further improvement of the above technical solution, multiple sound guide plates are arranged at equal intervals in the cavity, the distance between two adjacent sound guide plates is the width of the sound guide channel, and the height of the cavity is the depth of the sound guide channel.

[0008] As a further improvement to the above technical solution, the distance between two adjacent sound guide plates is L, with a value range of 20-50mm; the height of the cavity is H, with a value range of 60-100mm. Limited by the dimensions of existing range hoods, a sound guide device with these dimensions achieves better sound guidance without affecting the range hood's extraction efficiency.

[0009] As a further improvement to the above technical solution, the angle between the sound deflector and the horizontal plane is denoted by a, with a value ranging from 45° to 90°. When a is less than 45°, the sound deflector increases resistance to smoke entering the hood duct, hindering smoking. When a is greater than 90°, smoke is directed toward the user during cooking, hindering noise reduction.

[0010] As a further improvement to the above technical solution, a connecting piece is provided on the outside of the mounting base. By adding the connecting piece, the sound guide device can be directly installed on the range hood, and noise reduction can be achieved without modifying the internal structure of the range hood, which has good versatility and adaptability.

[0011] As a further improvement to the above technical solution, the mounting base includes a fixed support plate, the fixed support plate is provided with a plurality of slots, and the sound guide plate is mounted on the slots. The sound guide plate can be freely disassembled and assembled through the slots, which is more convenient.

[0012] As a further improvement of the above technical solution, the sound guide plate is made of oil-proof material. The material of the sound guide plate has little effect on its effect, and plastic, metal, and glass can be used. In order to prevent the sound guide plate from absorbing grease itself, oil-proof material is preferred.

[0013] The present invention further provides a range hood comprising an air intake port, wherein the air intake port is provided with the above-mentioned sound guide device. The range hood equipped with the sound guide device of the present invention has a good noise reduction effect.

[0014] As a further improvement of the above technical solution, the air intake also includes a filter, and the sound guide device is installed below the filter. The best effect is achieved when the sound guide plate is installed below the filter, because the sound is first transmitted from the inside of the range hood to the filter and then passes through the sound guide device, so that the medium and high frequency noise is transmitted in a direction. However, in order to make the range hood more simple and beautiful, installing the sound guide device close to the top of the filter also has a certain noise reduction effect. When the sound guide device is installed above the filter, after the noise is directed, it will produce a certain scattering effect after passing through the filter, causing part of the originally directed noise to spread again.

[0015] As a further improvement to the above technical solution, the housing further comprises a sound-absorbing panel located below the rear of the housing. This effectively reduces noise in the entire space by directing the directed noise toward the panel and absorbing it. Furthermore, because the panel is located outside the housing, it is easily replaceable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described only illustrate some embodiments of the present invention, not all of them. Those skilled in the art can derive other design solutions and drawings based on these drawings without inventive effort.

[0017] Figure 1 It is a structural schematic diagram of the sound guide device of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the range hood of the present invention;

[0019] Figure 3 This is a reference diagram for use of the sound guide device of the present invention. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in conjunction with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. The preferred embodiments of the present invention are shown in the drawings. The purpose of the drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0021] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0022] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0023] In the description of the present invention, unless otherwise expressly defined, terms such as "install," "connect," and "set" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the present invention based on the specific content of the technical solution. Furthermore, the various technical features of the present invention may be combined interchangeably as long as they do not conflict with each other.

[0024] Reference Figures 1 to 3 A silent range hood includes a range hood body 100, an air intake port is provided below the range hood body 100, a filter 200 is provided below the air intake port, a sound guide device 300 is provided below the filter, and the sound guide device 300 is fixed to the bottom of the range hood body 100.

[0025] The sound guide device 300 includes a mounting base 310, and the mounting base 310 includes an outer frame 311 and a cavity 312. A plurality of sound guide plates 320 are installed in the cavity 312, and the plurality of sound guide plates 320 are arranged at equal intervals in the front-to-back direction. The front here refers to the direction in which a person is facing the range hood, which is generally the direction in which a person operates the range hood, and the rear refers to the installation direction of the range hood, which generally refers to the wall of the kitchen. Multiple sound guide plates 320 and an outer frame 311 divide the cavity 312 into a plurality of sound guide channels 330, wherein the height of the outer frame 311 is H, and the selected value range of H can be: 60-100mm (calculated based on the installation dimensions of the bottom of the current general household range hood), and the spacing between two adjacent sound guide plates 320 is L, and the selected value range of L can be: 20-50mm, wherein the height of the outer frame 311 is the depth of the sound guide channel 330, and the spacing between the sound guide plates 320 is the width of the sound guide channel 330. Preferably, in this embodiment, H is 60mm, and L is 30mm, so the depth and width ratio of the sound guide channel is H:L=2:1. During operation, because the oil smoke needs to pass through the sound guide plate before entering the interior of the range hood, the spacing between the sound guide plates 320 should not be too small, otherwise it will affect the suction effect of the range hood. At the same time, the spacing between the sound guide plates 320 should not be too large. Too large a spacing will significantly reduce the sound guide effect, that is, the directional effect of the sound wave transmission will be worse.

[0026] As a further preferred embodiment, the angle between the sound guide plate 320 and the horizontal plane is a, and the value range of a is 45°-90°. Preferably, in this embodiment, a is 60°. Figure 2 It can be seen that the sound guide plate 320 is tilted backward with respect to the horizontal plane.

[0027] In this way, after the noise passes through the sound guide device 300, the mid- and high-frequency noise above 500HZ is guided and emitted backward. When these noises collide with other objects in the kitchen, part of them is absorbed and part of them is scattered, thereby reducing the noise entering the ears of people in front of the range hood.

[0028] Through experiments, we compared the noise level of range hoods with and without the sound guide. Measurements were taken in front of the range hood, roughly at ear level. The experimental data is shown in Table 1 below.

[0029] Table 1 adds sound pressure level noise test data before and after the sound guide plate (human ear position)

[0030]

[0031] As can be seen from the above table, after adding the sound guide device 300, the noise of some frequencies can be significantly reduced. Although the sound guide device 300 does not actually reduce the noise of the national standard, it can effectively reduce the noise intensity received by the ears of the operator (chef or housewife) through the directional propagation of noise, which plays a positive role. In a range hood, the higher the speed of the fan, the greater its suction force, and at the same time, the higher its noise. As a consumer, you hope that the suction force of the range hood is as strong as possible, and you also hope that the noise is as low as possible. By adding the sound guide device 300 of the present invention, this contradiction can be alleviated, so that the manufacturer of the range hood can develop a range hood with a better speed while effectively reducing the impact of the range hood noise on the human body.

[0032] As a further preferred embodiment, the mounting base 310 is provided with a connecting piece 313. By adding the connecting piece 313 to the mounting base 310, the sound guide device 300 can be directly mounted on the range hood body 100, for example, by fixing the connecting piece 313 to the housing of the range hood body 100 with screws, thereby achieving fixed installation of the sound guide device 300.

[0033] The sound guide device 300 is retrofitted onto the exterior of an existing range hood, eliminating the need to modify the internal structure of the range hood to achieve noise reduction. It offers excellent versatility and adaptability, and is easily disassembled and cleaned. For example, users can purchase the sound guide device 300 separately and retrofit it onto an existing range hood to achieve a certain noise reduction effect.

[0034] Alternatively, the range hood manufacturer can design and install the sound guide device 300 below the air intake of the range hood body during production, which can improve the consistency of the product and make it more beautiful and durable.

[0035] As a further preferred embodiment, the mounting base 310 further includes a fixed support plate 314, which is provided with a plurality of slots, and the sound guide plate 320 is mounted on the slots. The sound guide plate 320 can be freely disassembled and assembled through the slots, which is more convenient.

[0036] It should be understood that in this embodiment, there is no particular limitation on the material of the sound guide device 300. Many materials currently available on the market can be used to make the sound guide device, such as conventional materials such as plastic, metal, or glass. Of course, in order to increase the service life of the sound guide device, it is preferably made of an oil-proof material.

[0037] As a further preferred embodiment, a sound-absorbing panel is provided below the rear of the range hood body 100. For example, by attaching the panel to a wall, noise from the range hood is directed toward the wall after passing through the sound guide. The panel then absorbs this noise, effectively reducing the risk of this noise being reflected and then re-dispersed throughout the kitchen, partially reaching the ears and causing harm to the human body. Furthermore, because the panel is located outside the housing, it is easily replaceable.

[0038] In some embodiments, the sound guide device 300 can also be installed inside the range hood, close to the upper surface of the filter 200.

[0039] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A sound guide device for a range hood, characterized by: The utility model comprises a mounting seat, wherein the mounting seat comprises a cavity, wherein a plurality of sound guide plates are provided in the cavity, wherein the plurality of sound guide plates divide the cavity into a plurality of sound guide channels, wherein the sound guide channels comprise depth and width, and the ratio of the depth to the width of the sound guide channels is not less than 1; the plurality of sound guide plates are arranged in the cavity at equal intervals, and the distance between two adjacent sound guide plates is the width of the sound guide channel, and the height of the cavity is the depth of the sound guide channel; the distance between the two adjacent sound guide plates is L, and the value range of L is 20-50mm; the height of the cavity is H, and the value range of H is 60-100mm; the angle between the sound guide plate and the horizontal plane is a, and the value range of a is 45°-90°; the mounting seat comprises a fixed support plate, wherein a plurality of slots are provided on the fixed support plate, and the sound guide plates are installed on the slots; a connecting plate is provided on the outside of the mounting seat.

2. The sound guide device according to claim 1, characterized in that: The sound guide plate is made of oil-proof material.

3. A range hood, comprising an air intake, characterized in that: The air intake port is installed with a sound guide device as described in any one of claims 1-2.

4. The range hood according to claim 3, characterized in that: The air suction port also includes a filter, and the sound guide device is installed below the filter.

5. The range hood according to claim 3, characterized in that: The utility model further comprises a shell, wherein a sound absorbing panel is provided at the lower rear of the shell.

Images