Sound absorption box for range hood and range hood

Abstract

The utility model relates to a sound absorption box for a range hood and the range hood, the sound absorption box comprises a box body, and noise reduction holes are distributed on the wall of the box body; the sound absorption part is arranged in the box body; at least part of the side wall of the box body forms an arc-shaped curved surface structure to serve as a flow guide part, the noise reduction holes are distributed in the flow guide part, a lining piece is further arranged in the box body and provided with a supporting part consistent with the flow guide part of the box body in outline, and the supporting part is opposite to the flow guide part inside and outside. And the sound absorption piece is clamped between the supporting part of the lining piece and the flow guide part of the box body. According to the sound absorption box, the lining part is additionally arranged and abuts against the sound absorption part from the interior, so that the supporting part is well attached to the inner wall of the box body, good supporting performance is kept, and the sound absorption box can improve the sound absorption efficiency while reducing fluid resistance.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and in particular to a sound-absorbing box for a range hood and a range hood. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principles of fluid dynamics, using a centrifugal fan inside to draw in cooking fumes and a filter to remove some grease particles. The centrifugal fan consists of a casing, an impeller housed within the casing, and a motor that drives the impeller. As the impeller rotates, a negative pressure is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the fumes are collected by the casing and guided outdoors.

[0003] Currently, the noise of range hoods mainly comes from aerodynamic noise, mechanical noise, and electromagnetic noise, with aerodynamic noise being the primary source. Aerodynamic noise includes rotational noise and eddy current noise, with rotational noise being the main source. Rotational noise is inevitably generated by the structure itself under high-speed rotation. Simply changing the structure of the fan system (such as the trailing edge of the blades, the volute, the impeller disc, the volute profile, etc.) can generally only reduce noise by less than 0.5dB. This is because, to achieve a certain airflow while maintaining performance, a certain rotational speed must be reached. Under high-speed rotation, there will inevitably be rotational noise, and 70% of the noise we hear comes from rotational noise. To address the noise generated by range hoods, a generally better noise reduction measure is to apply passive noise reduction. Currently, porous sound-absorbing materials (such as sound-absorbing cotton) are widely used in the noise reduction of range hoods. For example, Chinese invention patent application CN202410021471.4 discloses a range hood with a noise reduction device installed in the lower box of the range hood. The noise reduction device includes a sound-absorbing box and sound-absorbing material installed in the sound-absorbing box. The sound-absorbing box has a first sidewall facing the side of the cooking fumes and a second sidewall opposite to the first sidewall. Noise reduction holes are opened on the first sidewall. The sound-absorbing material is attached to the inner side of the first sidewall of the sound-absorbing box. A space is formed in the sound-absorbing box between the second sidewall and the sound-absorbing material to form a flow cavity. The flow cavity is fluidly connected to the outside of the sound-absorbing box and can allow gas to flow in. The gas entering the flow cavity flows out of the sound-absorbing box through the sound-absorbing material and the noise reduction holes.

[0004] Currently, polyurethane is often used as sound-absorbing cotton. Polyurethane sound-absorbing cotton is formed by foaming and can be easily cut into any shape. However, it still has some shortcomings in practical applications: In order to increase sound absorption efficiency and reduce fluid resistance, the outer contour of the sound-absorbing box is often designed as a non-planar structure. Therefore, the shape of the sound-absorbing cotton required inside the sound-absorbing box is also an unconventional structure. Cutting the sound-absorbing cotton will lead to excessive costs, while ordinary sound-absorbing cotton cannot be fixed in shape, such as the inner side of the sound-absorbing box, which fits better.

[0005] Therefore, the sound-absorbing boxes used in existing range hoods still need further improvement. Utility Model Content

[0006] The first technical problem to be solved by this utility model is to provide a sound-absorbing box for range hoods that has a good noise reduction effect and can effectively avoid or reduce the cutting of sound-absorbing cotton, in light of the current state of the technology.

[0007] The second technical problem to be solved by this utility model is to provide a range hood that uses the above-mentioned sound-absorbing box, in view of the current state of the prior art.

[0008] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a sound-absorbing box for a range hood, comprising:

[0009] The box body has noise reduction holes distributed on its walls;

[0010] A sound-absorbing component is disposed inside the box.

[0011] The box body has at least a portion of its sidewalls constructed with an arc-shaped curved surface structure as a flow guide. The flow guide is provided with noise reduction holes. The box body is also provided with an inner liner. The inner liner has a support portion that is consistent with the outer contour of the flow guide of the box body. The support portion is opposite to the flow guide. The sound-absorbing component is sandwiched between the support portion of the inner liner and the flow guide of the box body.

[0012] To facilitate installation on the body of the range hood and to facilitate the installation of the inner lining and sound-absorbing components inside the box, the box is a cover structure with an opening on one side. The open part of the box is used to abut against the components to be installed on the range hood. The inner lining is also constructed as a cover structure adapted to the box.

[0013] As a specific embodiment of the aforementioned enclosure structure's box body and liner: the box body includes two first flat plates arranged side-by-side and a first arc-shaped plate connected between the edges of the two first flat plates, the first arc-shaped plate being the flow guide portion; the liner includes two second flat plates arranged side-by-side and a second arc-shaped plate connected between the edges of the two second flat plates, the second arc-shaped plate being the support portion; the two second flat plates are internally and externally opposite to the two first flat plates, and the second arc-shaped plate is internally and externally opposite to the first arc-shaped plate. It is conceivable that the box body and liner can be an overall arc-shaped curved surface structure, such as a bowl-shaped, plate-shaped, or hemispherical enclosure structure.

[0014] In order to better guide the airflow, the guide portion has a first end and a second end opposite to each other in its length direction, and the radius of curvature of the guide portion first decreases and then increases in the direction from the first end to the second end.

[0015] As an improvement, the tail end of the flow guide section of the box body is also provided with concave noise reduction pits. The structural design of the aforementioned noise reduction pits changes the boundary layer on the flow guide section of the box body from laminar flow to turbulent flow. That is, the fluid attached to the body has greater kinetic energy to propagate backward, stronger inertial force, and a smaller wake region after separation. This causes the boundary layer separation point to move backward, reducing pressure drag.

[0016] As an improvement, the sound-absorbing component is a two-component sound-absorbing cotton. Two-component sound-absorbing cotton is typically composed of two different materials. These two materials work together to achieve unique sound absorption performance. Generally, one component may be a fibrous material with good sound absorption properties, such as polyester fiber, which absorbs sound energy through friction between fibers and sound barrier. The other component may be functional additives, such as materials that improve the fire resistance, moisture resistance, or structural strength of the sound-absorbing cotton. From a microscopic perspective, two-component sound-absorbing cotton has a complex pore structure. These pores can be divided into open-cell and closed-cell types. The open-cell structure allows sound to enter the interior of the sound-absorbing cotton, where it is absorbed after multiple reflections and refractions within the pores; the closed-cell structure, to a certain extent, isolates sound from other substances (such as moisture and air), increasing the stability and durability of the sound-absorbing cotton. Two-component sound-absorbing cotton also features high-efficiency sound absorption; specifically, it exhibits good sound absorption effects over a wide frequency range. It combines the advantages of both materials. For high-frequency sounds, the fiber part can effectively absorb them because high-frequency sounds have short wavelengths and are easily consumed in the tiny pores between the fibers. For low-frequency sounds, due to its special structure and composition, it can also absorb them through resonance and other means.

[0017] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: a range hood, including a housing, on which the aforementioned sound-absorbing box for a range hood is provided.

[0018] As an improvement, the housing has a flue gas passage for the passage of flue gas, and the sound-absorbing box is disposed on the inner wall of the flue gas passage.

[0019] To effectively improve noise reduction, the housing includes a fan frame and a centrifugal fan housed within the fan frame, and the sound-absorbing box is located on the inner wall of the fan frame.

[0020] To further improve the noise reduction effect, the fan frame includes a first side wall and a second side wall opposite to each other, and sound-absorbing boxes are provided on both the first side wall and the second side wall.

[0021] Compared with existing technologies, the advantages of this invention are as follows: At least a portion of the sidewalls of the sound-absorbing box of this invention have an arc-shaped curved surface structure serving as a flow guide. Noise-reducing holes are distributed on the flow guide. By adding an inner lining, the sound-absorbing component is supported from the inside, allowing the support component to fit snugly against the inner wall of the box, thus maintaining excellent support. This allows the sound-absorbing box to improve sound absorption efficiency while reducing fluid resistance. Furthermore, the sound-absorbing component no longer needs to be cut to fit the contour of the box, effectively solving the problem of excessive cost caused by excessive waste from cutting the sound-absorbing component. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the sound-absorbing box according to an embodiment of the present utility model;

[0023] Figure 2 This is a cross-sectional view of the sound-absorbing box according to an embodiment of the present utility model;

[0024] Figure 3 This is an exploded view (front view) of the sound-absorbing box according to an embodiment of the present utility model;

[0025] Figure 4 This is an exploded view (rear view direction) of the sound-absorbing box according to an embodiment of the present utility model;

[0026] Figure 5 This is a vertical sectional view of the range hood of this utility model, cut along the left-right direction;

[0027] Figure 6 This is a vertical sectional perspective view of the range hood of this utility model, cut along the front-to-back direction. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0029] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0030] Figures 1-6This invention illustrates a preferred embodiment of the sound-absorbing box for a range hood and the range hood itself. The sound-absorbing box includes a box body 10, a sound-absorbing component 23, and an inner lining component 20. Both the sound-absorbing component 23 and the inner lining component 20 are located within the box body 10. The box body 10 can be a closed structure or a partially open structure. At least a portion of the sidewalls of the box body 10 are constructed with an arc-shaped curved surface structure as a flow guide 11. The flow guide 11 is designed to reduce or minimize fluid flow resistance in the flue gas passage 310 environment where the sound-absorbing box is located. Noise-reducing holes 113 are distributed on the flow guide 11. The distribution of the noise-reducing holes 113 on the flow guide 11 can be matrix-like or other disordered distributions. The aperture size of the noise-reducing holes 113 is generally 0.8mm to 1.2mm, and can be selected according to actual noise reduction needs. The noise reduction principle of the noise-reducing holes 113 is prior art and will not be described in detail.

[0031] See Figure 3 and Figure 4 The box body 10 also includes an inner liner 20. This inner liner 20 has a support portion 21 whose outline matches the contour of the flow guide portion 11 of the box body 10. Specifically, the support portion 21 is also an arc-shaped curved surface structure that is essentially the same shape as the flow guide portion 11 of the box body 10. The support portion 21 and the flow guide portion 11 are opposite each other internally and externally. The sound-absorbing component 23 is sandwiched between the support portion 21 of the inner liner 20 and the flow guide portion 11 of the box body 10. By adding the inner liner 20, the sound-absorbing component 23 is supported from the inside, allowing the support portion to fit well against the inner wall of the box body 10, thus maintaining good support. This allows the sound-absorbing box to improve sound absorption efficiency while reducing fluid resistance. The sound-absorbing component 23 also does not need to be cut to fit the contour of the box body 10, effectively solving the problem of excessive cost caused by excessive waste material from cutting the sound-absorbing component 23.

[0032] In a preferred embodiment, the box body 10 is a cover structure with an open side. The open portion of the box body 10 is used to abut against the component to be installed on the range hood. The inner liner 20 is also constructed as a cover structure adapted to the box body 10. As a preferred embodiment of the box body 10 and inner liner 20 described above: the box body 10 includes two first flat plates 12 arranged side-by-side and a first arc-shaped plate connected between the edges of the two first flat plates 12. The first arc-shaped plate is the aforementioned guide portion 11. The inner liner 20 includes two second flat plates 22 arranged side-by-side and a second arc-shaped plate connected between the edges of the two second flat plates 22. The second arc-shaped plate is the aforementioned support portion 21. The two second flat plates 22 of the inner liner 20 are internally and externally opposite to the two first flat plates 12 of the box body 10, and the second arc-shaped plate of the inner liner 20 is internally and externally opposite to the first arc-shaped plate of the box body 10. When installed onto the casing of the range hood, the open perimeter of the housing 10 and / or the open perimeter of the inner liner 20 are aligned with the corresponding side wall of the casing. It is conceivable that the housing 10 and the inner liner 20 can be integrally curved structures, such as bowl-shaped, plate-shaped, or hemispherical covers. The open cover structure is adopted to facilitate installation on the range hood casing and to facilitate the installation of the inner liner 20 and the sound-absorbing component 23 inside the housing 10.

[0033] The airflow guide 11 (also the first arc-shaped plate) of the housing 10 in this embodiment has a first end 111 and a second end 112 opposite each other in its length direction. The radius of curvature of the airflow guide 11 first decreases and then increases in the direction from the first end 111 to the second end 112. The "length direction" of the airflow guide 11 of the housing 10 is substantially consistent with the airflow direction at the installation location of the sound-absorbing box (such as within a flue gas duct), thereby better guiding the airflow and reducing fluid flow resistance.

[0034] See Figure 1 and Figure 2 The tail end of the flow guide section 11 of the housing 10 (i.e., the location of the second end 112 mentioned above) is also provided with recessed noise-reducing pits 114. The presence of noise-reducing pits 114 at the tail end of the housing 10 allows the boundary layer on the flow guide section 11 of the housing 10 to change from laminar to turbulent flow. This means the fluid adhering to the body has greater kinetic energy to propagate backward, stronger inertial force, and a smaller wake region after separation, causing the boundary layer separation point to shift backward and reducing pressure drag. To facilitate the provision of noise-reducing pits 114, the wall thickness of the tail end of the flow guide section 11 of the housing 10 (i.e., the location of the second end 112 mentioned above) can be relatively thickened.

[0035] Sound-absorbing component 23 is a two-component sound-absorbing cotton. Two-component sound-absorbing cotton is typically composed of two different materials. These two materials work together to achieve unique sound absorption performance. One component is usually a fiber material with good sound absorption properties, such as polyester fiber, which absorbs sound energy through friction between fibers and sound barrier. The other component may be functional additives, such as materials that improve the fire resistance, moisture resistance, or structural strength of the sound-absorbing cotton. Microscopically, two-component sound-absorbing cotton has a complex pore structure. These pores can be divided into open-cell and closed-cell types. The open-cell structure allows sound to enter the cotton, where it is absorbed after multiple reflections and refractions within the pores; the closed-cell structure, to a certain extent, isolates sound from other substances (such as moisture and air), increasing the stability and durability of the cotton. Two-component sound-absorbing cotton also features high-efficiency sound absorption; specifically, it exhibits good sound absorption across a wide frequency range. It combines the advantages of both materials. For high-frequency sounds, the fiber part can effectively absorb them because high-frequency sounds have short wavelengths and are easily consumed in the tiny pores between the fibers. For low-frequency sounds, due to its special structure and composition, it can also absorb them through resonance and other means.

[0036] See Figure 5 and Figure 6 This embodiment also relates to a range hood, which includes a housing with a smoke passage 310 for smoke to pass through, and a sound-absorbing box disposed on the inner wall of the smoke passage 310. Specifically, the housing generally includes a fan frame 31 and a smoke collection hood 32 disposed at the bottom of the fan frame 31, the inner cavity of the fan frame 31 being connected to the inner cavity of the smoke collection hood 32. An air inlet is provided at the bottom of the smoke collection hood 32, through which external smoke can enter the smoke collection hood 32. A centrifugal fan is disposed within the fan frame 31, and when the centrifugal fan operates, it generates negative pressure, allowing external oil fumes to be drawn into the smoke collection hood 32 through the air inlet. An oil filter is also provided at the air inlet of the smoke collection hood 32 for filtering oil fumes. An oil cup 33 is usually provided at the bottom rear side of the smoke collection hood 32, the oil cup 33 being a long strip extending left and right, for collecting oil stains flowing down from the smoke collection hood 32.

[0037] Considering that the range hood fan is the main noise source, the sound-absorbing box in this embodiment is located on the inner wall of the fan frame 31. Specifically, the fan frame 31 includes a first side wall 311 and a second side wall 312, both of which are equipped with sound-absorbing boxes. During operation, the high-speed rotation of the fan blades causes air vibration, thereby generating noise. Placing the sound-absorbing box on the side wall of the fan frame 31 allows for close-range noise absorption. Because sound propagation gradually attenuates with increasing distance, proximity to the noise source allows for effective control in the initial stage of noise generation, reducing the intensity of noise propagation.

Claims

1. A sound-absorbing box for a range hood, comprising: Box (10), the walls of which are provided with noise reduction holes (113); A sound-absorbing component (23) is disposed inside the housing (10); The features are as follows: the box body (10) has at least a portion of its sidewalls constructed with an arc-shaped curved surface structure as a flow guide (11), the flow guide (11) is provided with the noise reduction holes (113), the box body (10) is also provided with an inner liner (20), the inner liner (20) has a support part (21) that is consistent with the outer contour of the flow guide (11) of the box body (10), the support part (21) is opposite to the flow guide (11) inside and out, and the sound-absorbing member (23) is sandwiched between the support part (21) of the inner liner (20) and the flow guide (11) of the box body (10).

2. The sound-absorbing box for a range hood according to claim 1, characterized in that: The box body (10) is a cover structure with an open side. The open part of the box body (10) is used to be attached to the part to be installed on the range hood. The inner liner (20) is also constructed as a cover structure that is compatible with the box body (10).

3. The sound-absorbing box for a range hood according to claim 2, characterized in that: The box body (10) includes two first flat plates (12) arranged side by side and a first arc plate connected between the edges of the two first flat plates (12). The first arc plate is the flow guide (11). The inner liner (20) includes two second flat plates (22) arranged side by side and a second arc plate connected between the edges of the two second flat plates (22). The second arc plate is the support (21). The two second flat plates (22) are opposite to the two first flat plates (12) inside and out. The second arc plate is opposite to the first arc plate inside and out.

4. The sound-absorbing box for a range hood according to claim 1, characterized in that: The flow guide (11) has a first end (111) and a second end (112) opposite each other in its length direction. In the direction from the first end (111) to the second end (112) of the flow guide (11), the radius of curvature of the flow guide (11) first decreases and then increases.

5. The sound-absorbing box for a range hood according to claim 1, characterized in that: The tail of the flow guide (11) of the box body (10) is also provided with concave noise reduction pits (114).

6. The sound-absorbing box for a range hood according to any one of claims 1 to 5, characterized in that: The sound-absorbing component (23) is a two-component sound-absorbing cotton.

7. A range hood, comprising a housing, characterized in that: The housing is provided with a sound-absorbing box for a range hood according to any one of claims 1 to 6.

8. The range hood according to claim 7, characterized in that: The housing has a flue gas passage (310) through which flue gas passes, and the sound-absorbing box is disposed on the inner wall of the flue gas passage (310).

9. The range hood according to claim 8, characterized in that: The housing includes a fan frame (31) and a centrifugal fan disposed within the fan frame (31), and the sound-absorbing box is disposed on the inner wall of the fan frame (31).

10. The range hood according to claim 9, characterized in that: The fan frame (31) includes a first side wall (311) and a second side wall (312) opposite to each other, and both the first side wall (311) and the second side wall (312) are provided with sound-absorbing boxes.

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