Noise reduction structure and range hood comprising same

Abstract

The invention discloses a noise reduction structure and a range hood comprising the noise reduction structure, the noise reduction structure is arranged in a case of a fan system, the noise reduction structure is arranged at a volute tongue of a volute of the fan system, the noise reduction structure is provided with a noise reduction cavity in a penetrating mode in the axial direction of the volute, and the noise reduction cavity is communicated with the volute tongue of the volute. The noise reduction cavity communicates with the first air inlet area and the second air inlet area of the volute, and the cross section area of a cavity of the noise reduction cavity accounts for 20%-35% of the cross section area of the noise reduction structure. The noise reduction structure is arranged at the volute tongue, so that the operation noise of the fan system is reduced. By arranging the noise reduction cavity, the first air inlet area and the second air inlet area are communicated through the noise reduction cavity, the flowing resistance of airflow is improved, the adverse effect of the noise reduction structure on the flowing state in the case is weakened, and the inner wall of the noise reduction cavity can also be used for absorbing noise; in this way, the noise reduction effect is improved, and the aerodynamic performance of the fan system is guaranteed by increasing the sound absorption area of the noise reduction structure.

Description

Technical Field

[0001] This invention specifically relates to a noise reduction structure and a range hood containing the same. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. As people's quality of life and health awareness improve, consumers are demanding increasingly quiet operation from range hoods. As a result, technicians are conducting more and more in-depth research in this area. In addition to continuous design improvements to the fan system inside the range hood, noise reduction structures are being used more and more widely, resulting in better low-noise performance for the entire range hood.

[0003] Because the remaining space inside the range hood housing is limited, excluding the fan system, the space available for installing noise reduction structures is also relatively limited. Although the installation of noise reduction structures can reduce noise to some extent, due to space constraints, the introduction of the noise reduction structures themselves actually has an adverse effect on the airflow within the housing, leading to a certain degree of noise increase, thus failing to fully realize the function of the noise reduction structures. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art where the space inside the range hood is limited, the aerodynamic performance is deteriorated when a noise reduction structure is set up, and the noise reduction effect of the noise reduction structure is not good. The present invention provides a noise reduction structure and a range hood containing the same.

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

[0006] A noise reduction structure is provided, wherein the noise reduction structure is disposed inside the casing of a fan system, the noise reduction structure is disposed at the volute tongue of the volute of the fan system, the noise reduction structure has a noise reduction cavity extending through the volute along the axial direction, the noise reduction cavity is connected to the first air inlet area and the second air inlet area of ​​the volute respectively, and the cavity cross-sectional area of ​​the noise reduction cavity accounts for 20-35% of the cross-sectional area of ​​the noise reduction structure.

[0007] In this solution, a noise reduction structure is installed at the volute tongue to reduce the noise of the fan system. Furthermore, a noise reduction cavity is incorporated to connect the first and second air inlet zones, improving airflow resistance and reducing the obstruction of airflow by the noise reduction structure. This weakens the adverse effects of the noise reduction structure on the airflow within the casing. The inner wall of the noise reduction cavity can also absorb noise. By creating a noise reduction cavity within the noise reduction structure, the sound-absorbing area is increased, improving the noise reduction effect while ensuring the aerodynamic performance of the fan system. The noise reduction effect is guaranteed by limiting the cross-sectional area of ​​the noise reduction cavity.

[0008] Preferably, a coordinate system is established with the axis of the volute as the origin and the cross-section of the volute as the coordinate plane. The volute tongue is located in the second quadrant of the coordinate system, and the noise reduction cavity is located in the first quadrant of the coordinate system.

[0009] In this solution, the above settings are used to limit the area where the noise reduction cavity is located, so that the noise reduction cavity is in a suitable position and remains open.

[0010] Preferably, the noise reduction cavity located in the first quadrant of the coordinate system includes a first endpoint and a second endpoint, the first endpoint being offset from the Y-axis of the coordinate system and the second endpoint being offset from the X-axis of the coordinate system.

[0011] In this solution, the boundary position of the noise reduction cavity is limited by the above settings to avoid the noise reduction cavity from being too large.

[0012] Preferably, the line connecting the first endpoint and the origin forms a first angle with the Y-axis of the coordinate system, and the line connecting the second endpoint and the origin forms a second angle with the line connecting the first endpoint and the origin. The first angle ranges from 0 to 15°, and the second angle ranges from 35 to 60°.

[0013] In this scheme, the positions of the first endpoint and the second endpoint in the first quadrant are determined by the above settings.

[0014] Preferably, the thickness of the region where the noise reduction structure coincides with the Y-axis of the coordinate system is b, and the thickness of the inner wall of the noise reduction cavity away from the volute along the Y-axis direction of the coordinate system is b1, wherein the value of b1 is in the range of min(b / 3, 10mm)≤b1≤max(b / 2, 15mm).

[0015] In this scheme, the above settings ensure that, along the Y-axis of the coordinate system, there is sufficient space for the first air intake area and the second air intake area to have a connection.

[0016] Preferably, along the X-axis of the coordinate system, the thickness of the inner wall of the noise reduction cavity away from the volute tongue is b2, and the value of b2 is in the range of b1≤b2≤25mm+b1.

[0017] In this scheme, the above settings ensure that, along the X-axis of the coordinate system, there is sufficient space for the first air intake area and the second air intake area to have a connection between the noise reduction cavity and the volute.

[0018] Preferably, the minimum distance between the first endpoint and the second endpoint and the annular wall of the volute is the distance between the first endpoint and the annular wall of the volute. The distance between the first endpoint and the annular wall of the volute is b3, and the value of b3 is in the range of min(b / 3, 10mm)≤b3≤max(b / 2, 15mm).

[0019] In this solution, the position of the first endpoint is set reasonably through the above settings, thereby ensuring the sound absorption area of ​​the noise reduction cavity.

[0020] Preferably, the first side of the noise reduction structure away from the annular wall of the volute along the Y-axis of the coordinate system is connected end-to-end with the second side of the noise reduction structure away from the annular wall of the volute along the X-axis of the coordinate system, and the angle formed by the connection between the first side and the second side is 90° with the angle formed by the connection between the first side plate and the second side plate of the chassis.

[0021] In this solution, the above-mentioned settings ensure that the noise reduction structure can fully fill the connection between the first and second side panels of the chassis, thus preventing the noise reduction structure from failing to effectively fill the area and causing turbulence that affects the aerodynamic performance of the fan system when the airflow passes through, which would otherwise affect the aerodynamic performance of the fan system.

[0022] Preferably, the noise reduction structure is made of sound-absorbing cotton.

[0023] In this solution, the above settings are used to achieve the noise absorption function of the noise reduction structure.

[0024] A range hood includes a fan system and a noise reduction structure as described above.

[0025] In this solution, the range hood includes a fan system and the aforementioned noise reduction structure. The noise reduction structure is installed within the fan system to reduce the noise of the fan system operation, while maintaining the connection between the first and second air intake zones. This reduces the adverse effects of the noise reduction structure on the flow state within the housing due to the space occupied by the structure in a limited space. The sound absorption surface area of ​​the noise reduction structure is correspondingly increased, thereby fully leveraging the function of the noise reduction structure.

[0026] The positive and progressive effects of this invention are as follows: By incorporating a noise-reducing structure at the volute tongue, the noise of the fan system is reduced. Furthermore, by setting up a noise-reducing cavity to connect the first and second air inlet areas, the flow resistance of the airflow is improved, reducing the obstruction of airflow by the noise-reducing structure, thereby mitigating the adverse effects of the noise-reducing structure on the flow state within the casing. The inner wall of the noise-reducing cavity can also be used to absorb noise. By creating a noise-reducing cavity in the noise-reducing structure, the sound-absorbing area of ​​the structure is increased, thereby improving the noise reduction effect and ensuring the aerodynamic performance of the fan system. The noise reduction effect of the structure is guaranteed by limiting the cross-sectional area of ​​the noise-reducing cavity. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a range hood according to a preferred embodiment of the present invention.

[0028] Figure 2 This is a diagram showing the positional relationship between the noise reduction structure and the volute in a preferred embodiment of the present invention.

[0029] Figure 3 This is a diagram showing the positional relationship of the noise reduction cavity in the first quadrant of the coordinate system according to a preferred embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] Noise Reduction Structure 1

[0032] Noise Reduction Chamber 11

[0033] First endpoint 111

[0034] Second endpoint 112

[0035] First side 12

[0036] Second side 13

[0037] Chassis 2

[0038] 3-shell

[0039] Cochlear tongue 31

[0040] Quadrant 4

[0041] Second Quadrant 5

[0042] First side panel 6

[0043] Second side panel 7 Detailed Implementation

[0044] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0045] This embodiment provides a noise reduction structure, the specific structure of which is as follows: Figure 1 , Figure 2 and Figure 3 As shown, the noise reduction structure 1 is installed inside the casing 2 of the fan system. The noise reduction structure 1 is installed at the volute tongue 31 of the volute 3 of the fan system. The noise reduction structure 1 has a noise reduction cavity 11 that runs through it along the axial direction of the volute 3. The noise reduction cavity 11 is connected to the first air inlet area and the second air inlet area of ​​the volute 3 respectively. The cross-sectional area of ​​the cavity 11 accounts for 20-35% of the cross-sectional area of ​​the noise reduction structure 1.

[0046] Specifically, the first and second air inlet zones of the volute 3 are the air inlet areas in the axial direction of the volute 3, also known as the main air inlet zone and the secondary air inlet zone. The noise reduction structure 1 is installed at the volute tongue 31 of the volute 3 of the fan system, and one side of the noise reduction structure 1 is attached to the outer surface of the annular wall of the volute 3. By installing the noise reduction structure 1 at the volute tongue 31, the noise generated by the airflow at that location is absorbed, thereby reducing the noise of the fan system operation.

[0047] In this embodiment, the noise reduction structure 1 has a noise reduction cavity 11 extending through the axial direction of the volute 3. The noise reduction cavity 11 is an irregularly shaped hole. The noise reduction cavity 11 is connected to the first air intake area and the second air intake area respectively. Compared with the noise reduction structure 1 without the noise reduction cavity 11, the noise reduction structure 1 with the noise reduction cavity 11 can make the airflow of the first air intake area and the second air intake area interconnected. This overcomes the problem that the airflow of the first air intake area and the second air intake area is obstructed due to the limited space occupied by the noise reduction structure 1 in the casing 2 of the fan system. This reduces the adverse effect of the noise reduction structure 1 on the flow state in the casing 2, keeps the turbulent area away from the air inlet of the volute 3, thereby reducing the adverse interference to the intake air and improving the aerodynamic performance of the fan system. The noise reduction can be increased by 0.2~0.3dB.

[0048] It is understandable that the noise reduction structure 1 itself can absorb noise. When a noise reduction cavity 11 is formed on the noise reduction structure 1, the inner wall of the noise reduction cavity 11 is made of the same material as the noise reduction structure 1, and the inner wall of the noise reduction cavity 11 can also be used to absorb noise. Furthermore, compared to the noise reduction structure 1 without the noise reduction cavity 11, the sound absorption area of ​​the noise reduction structure 1 with the noise reduction cavity 11 is correspondingly increased, so as to improve the noise reduction effect and ensure the aerodynamic performance of the fan system.

[0049] In this embodiment, the cross-sectional area of ​​the noise reduction cavity 11 accounts for 20-35% of the cross-sectional area of ​​the noise reduction structure 1. By limiting the cross-sectional area of ​​the noise reduction cavity 11, it is possible to prevent the noise reduction cavity 11 from being too large or too small, so as to ensure the noise reduction effect of the noise reduction structure 1.

[0050] In this embodiment, a coordinate system is established with the axis of the volute 3 as the origin and the cross section of the volute 3 as the coordinate plane. The volute tongue 31 is located in the second quadrant 5 of the coordinate system, and the noise reduction cavity 11 is located in the first quadrant 4 of the coordinate system.

[0051] Specifically, the cross-section of the volute 3 is a plane parallel to the side plate of the volute 3. From the cross-section, the axis of the volute 3 is the origin, and a coordinate system is constructed to determine the positions of the volute tongue 31 and the noise reduction cavity 11. The coordinate system is the existing cross coordinate system, which will not be elaborated further here. The horizontal direction of the cross-section is taken as the X-axis of the coordinate system, and the vertical direction of the cross-section is taken as the Y-axis. The area above the X-axis and to the right of the Y-axis is the first quadrant 4 of the coordinate system, and the area above the X-axis and to the left of the Y-axis is the second quadrant 5. In this embodiment, the noise reduction structure 1 spans both the first quadrant 4 and the second quadrant 5, and the noise reduction cavity 11 is located in the first quadrant 4. The pressure distribution of the flow field within the chassis 2 is considered to limit the area where the noise reduction cavity 11 is located, ensuring that the noise reduction cavity 11 is in a suitable position and remains open.

[0052] In this embodiment, the noise reduction cavity 11 located in the first quadrant 4 of the coordinate system includes a first endpoint 111 and a second endpoint 112. The first endpoint 111 is offset from the Y-axis of the coordinate system, and the second endpoint 112 is offset from the X-axis of the coordinate system.

[0053] Specifically, the boundary of the noise reduction cavity 11 includes a first endpoint 111 and a second endpoint 112. The first endpoint 111 is offset from the Y-axis of the coordinate system toward the X-axis, and the second endpoint 112 is offset from the X-axis of the coordinate system toward the Y-axis. Compared to the first endpoint 111 coinciding with the Y-axis of the coordinate system and the second endpoint 112 coinciding with the X-axis of the coordinate system, the area occupied by the noise reduction cavity 11 in the first quadrant 4 is further restricted, so as to avoid the situation where the airflow through the noise reduction cavity 11 is too large and affects the pressure distribution inside the chassis 2.

[0054] In this embodiment, the line connecting the first endpoint 111 and the origin forms a first angle α with the Y-axis of the coordinate system, and the line connecting the second endpoint 112 and the origin forms a second angle β with the line connecting the first endpoint 111 and the origin. The first angle α ranges from 0 to 15°, and the second angle β ranges from 35 to 60°. By limiting the ranges of the first angle α and the second angle β, the positions of the first endpoint 111 and the second endpoint 112 within the first quadrant 4 are further determined.

[0055] In this embodiment, the thickness of the region where the noise reduction structure 1 coincides with the Y-axis of the coordinate system is b, and the thickness of the inner wall of the noise reduction cavity 11 away from the volute 3 along the Y-axis direction of the coordinate system is b1, wherein the value range of b1 is min(b / 3, 10mm)≤b1≤max(b / 2, 15mm).

[0056] Specifically, the thickness of the region where the noise reduction structure 1 coincides with the Y-axis of the coordinate system is b. This thickness can be determined based on the actual thickness of the noise reduction structure 1 in the Y-axis region of the coordinate system. In addition, the thickness of the inner wall of the noise reduction cavity 11 away from the volute 3 along the Y-axis direction of the coordinate system is b1. By substituting the actual value of b into the value range of b1, the range of b1 is limited so that the inner wall of the noise reduction cavity 11 away from the volute 3 along the Y-axis direction of the coordinate system is not too thick. This ensures the cavity cross-sectional area of ​​the noise reduction cavity 11, allowing sufficient through space between the first air intake area and the second air intake area.

[0057] Furthermore, in this embodiment, along the X-axis direction of the coordinate system, the inner wall thickness of the noise reduction cavity 11 away from the volute tongue 31 is b2, and the value range of b2 is b1≤b2≤25mm+b1.

[0058] Specifically, based on the range of values ​​for b1, b1 is substituted to obtain the range of values ​​for b2, thereby ensuring that the noise reduction cavity 11 is not too thick away from the inner wall of the volute 3 along the X-axis direction of the coordinate system, thus ensuring that the cavity cross-sectional area of ​​the noise reduction cavity 11 has sufficient through space between the first air intake area and the second air intake area.

[0059] In this embodiment, the minimum distance between the first endpoint 111 and the second endpoint 112 and the annular wall of the volute 3 is the distance between the first endpoint 111 and the annular wall of the volute 3. The distance between the first endpoint 111 and the annular wall of the volute 3 is b3, and the value range of b3 is min(b / 3, 10mm)≤b3≤max(b / 2, 15mm).

[0060] Specifically, by substituting the actual value of b into the range of b3, the distance between the boundary of the noise reduction cavity 11 and the annular wall of the volute 3 is prevented from being too close. That is, the position of the first endpoint 111 is reasonably set. It can be understood that when the boundary of the noise reduction cavity 11 is a certain distance from the annular wall of the volute 3, compared with the boundary of the noise reduction cavity 11 being set to fit the annular wall of the volute 3, the noise reduction cavity 11 can be set through in this area, so that the noise reduction cavity 11 can ensure sufficient sound absorption area on the basis of the through setting, thereby ensuring the noise reduction effect.

[0061] In this embodiment, the first side 12 of the noise reduction structure 1 away from the annular wall of the volute 3 along the Y-axis of the coordinate system is connected end to end with the second side 13 of the noise reduction structure 1 away from the annular wall of the volute 3 along the X-axis of the coordinate system, and the angle formed by the connection between the first side 12 and the second side 13 and the angle formed by the connection between the first side plate 6 and the second side plate 7 of the chassis 2 are both 90°.

[0062] Specifically, viewed from a plane parallel to the side plate of the volute 3, the noise reduction structure 1 includes a first side 12 and a second side 13, which are connected end-to-end at a 90° angle. Similarly, the corners inside the chassis 2 corresponding to the noise reduction structure 1 include a first side plate 6 and a second side plate 7, which are connected end-to-end at a 90° angle. With the noise reduction structure 1 positioned at the volute tongue 31 of the volute 3, the area of ​​the noise reduction structure 1 corresponding to the first side plate 6 and the second side plate 7 can fully fill the connection between the first side plate 6 and the second side plate 7 of the chassis 2, preventing the noise reduction structure 1 from failing to effectively fill this area and causing turbulence that affects the aerodynamic performance of the fan system when airflow passes through.

[0063] In this embodiment, the noise reduction structure 1 is made of sound-absorbing cotton. The sound-absorbing cotton enables the noise reduction structure 1 to absorb noise.

[0064] This embodiment also provides a range hood, which includes a fan system and the aforementioned noise reduction structure 1. The noise reduction structure 1 is installed within the fan system to reduce the noise of the fan system operation, while maintaining the connection between the first air intake zone and the second air intake zone. This reduces the adverse effects of the noise reduction structure 1 on the flow state within the housing after occupying space in a limited space. The sound absorption surface area of ​​the noise reduction structure 1 is correspondingly increased, thereby fully utilizing the function of the noise reduction structure.

[0065] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A noise reduction structure, wherein the noise reduction structure is disposed within the chassis of a fan system, characterized in that, The noise reduction structure is disposed at the volute tongue of the volute of the fan system. The noise reduction structure has a noise reduction cavity through it along the axial direction of the volute. The noise reduction cavity is connected to the first air inlet area and the second air inlet area of ​​the volute, respectively. The cross-sectional area of ​​the cavity of the noise reduction cavity accounts for 20-35% of the cross-sectional area of ​​the noise reduction structure.

2. The noise reduction structure as described in claim 1, characterized in that, A coordinate system is established with the axis of the volute as the origin and the cross-section of the volute as the coordinate plane. The volute tongue is located in the second quadrant of the coordinate system, and the noise reduction cavity is located in the first quadrant of the coordinate system.

3. The noise reduction structure as described in claim 2, characterized in that, The noise reduction cavity located in the first quadrant of the coordinate system includes a first endpoint and a second endpoint, the first endpoint being offset from the Y-axis of the coordinate system and the second endpoint being offset from the X-axis of the coordinate system.

4. The noise reduction structure as described in claim 3, characterized in that, The line connecting the first endpoint and the origin forms a first angle with the Y-axis of the coordinate system, and the line connecting the second endpoint and the origin forms a second angle with the line connecting the first endpoint and the origin. The first angle ranges from 0 to 15°, and the second angle ranges from 35 to 60°.

5. The noise reduction structure as described in claim 4, characterized in that, The thickness of the region where the noise reduction structure coincides with the Y-axis of the coordinate system is b. Along the Y-axis direction of the coordinate system, the thickness of the inner wall of the noise reduction cavity away from the volute is b1. The value of b1 is in the range of min(b / 3, 10mm)≤b1≤max(b / 2, 15mm).

6. The noise reduction structure as described in claim 5, characterized in that, Along the X-axis of the coordinate system, the thickness of the inner wall of the noise reduction cavity away from the volute tongue is b2, and the value of b2 is in the range of b1≤b2≤25mm+b1.

7. The noise reduction structure as described in claim 6, characterized in that, The minimum distance between the first endpoint and the second endpoint and the annular wall of the volute is the distance between the first endpoint and the annular wall of the volute. The distance between the first endpoint and the annular wall of the volute is b3, and the value of b3 is in the range of min(b / 3, 10mm)≤b3≤max(b / 2, 15mm).

8. The noise reduction structure as described in claim 2, characterized in that, Along the Y-axis of the coordinate system, the first side of the noise reduction structure away from the annular wall of the volute is connected end to end with the second side of the noise reduction structure away from the annular wall of the volute along the X-axis of the coordinate system, and the angle formed by the connection between the first side and the second side is 90° with the angle formed by the connection between the first side plate and the second side plate of the chassis.

9. The noise reduction structure as described in claim 1, characterized in that, The noise reduction structure is made of sound-absorbing cotton.

10. A range hood, characterized in that, The range hood includes a fan system and also includes a noise reduction structure as described in any one of claims 1-9.

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