Exhaust duct assembly and range hood device
By incorporating a Helmholtz resonant cavity within the exhaust duct, the resonance effect is utilized to convert noise waves into heat energy, thus solving the noise radiation problem of aluminum foil corrugated pipes and achieving a wideband noise reduction effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU ROBAM APPLIANCES CO LTD
- Filing Date
- 2025-08-29
- Publication Date
- 2026-07-31
AI Technical Summary
The existing exhaust pipes of the range hood are made of aluminum foil corrugated pipes. The high-speed airflow impacts the folds, causing flow-induced noise. The noise can easily penetrate the pipe wall and generate noise radiation.
A sealed cavity is set between the inner and outer walls of the exhaust duct. The separator divides the cavity into multiple noise reduction cavities. The noise reduction cavities form Helmholtz resonant cavities. The noise sound waves are converted into heat energy dissipation through the noise reduction holes, and noise reduction is achieved by utilizing the Helmholtz resonance effect.
It effectively reduces noise radiation, achieves broadband noise reduction, improves noise reduction during the exhaust process, and prevents noise from penetrating the pipe wall.
Smart Images
Figure CN224580330U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of kitchen equipment technology, and in particular to an exhaust pipe assembly and a range hood device. Background Technology
[0002] The exhaust pipe of the range hood is one of the noise sources of the range hood. The existing range hood exhaust pipe is usually made of aluminum foil corrugated pipe. Its inner wall is wrinkled. When the air is exhausted, the high-speed airflow will hit the wrinkles, resulting in flow-induced noise. In addition, the pipe wall of aluminum foil corrugated pipe is relatively thin, and noise can easily penetrate, thus generating noise radiation. Utility Model Content
[0003] The purpose of this utility model is to provide an exhaust pipe assembly and a range hood device to alleviate the technical problems existing in the prior art, where the exhaust pipe of the range hood is usually made of aluminum foil corrugated pipe, and the high-speed airflow will hit the folds during exhaust, resulting in flow-induced noise, and the noise can easily penetrate the pipe wall and generate noise radiation.
[0004] In a first aspect, this utility model provides an exhaust pipe assembly, including a pipe and a separator; A sealed cavity is provided between the inner and outer walls of the pipe. A separator is set in the cavity and divides the cavity into multiple noise reduction cavities that are distributed sequentially and are independent of each other along the extension direction of the pipe. The inner wall of the pipe corresponding to the noise reduction cavity is provided with noise reduction holes so that the noise reduction cavity forms a Helmholtz resonant cavity. The volumes of the multiple noise reduction cavities are different and / or the total area of the noise reduction holes at the multiple noise reduction cavities is different, so that the noise reduction frequency bands of the multiple noise reduction cavities are different.
[0005] In an optional embodiment, the separator is made of a flexible material and is capable of absorbing vibrations between the inner and outer walls of the pipe.
[0006] In an optional implementation, there are multiple partitions, which are spaced apart along the extension direction of the pipe, and each noise reduction cavity has a different length in the extension direction of the pipe.
[0007] In an optional implementation, the number of noise reduction holes at the multiple noise reduction cavities is different, or the aperture of the noise reduction holes at the multiple noise reduction cavities is different.
[0008] In an optional embodiment, the cavity is an annular cavity extending circumferentially along the pipe, the separator is a sealing ring, and the outer annular surface of the separator abuts against the outer annular surface of the cavity, and the inner annular surface of the separator abuts against the inner annular surface of the cavity.
[0009] In an optional embodiment, the pipeline includes an inner pipe and an outer pipe, with the outer pipe sleeved over the inner pipe, and the ends of the outer pipe and the inner pipe being sealed together.
[0010] In an optional embodiment, the difference between the outer diameter of the outer tube and the outer diameter of the inner tube is 5-100 mm.
[0011] In an alternative implementation, the pipe is a retractable corrugated pipe.
[0012] In an optional implementation, the pipe is a rigid pipe.
[0013] Secondly, this utility model provides a range hood device, including a range hood and an exhaust pipe assembly of any of the aforementioned embodiments; The range hood is equipped with an exhaust vent, and one end of the duct is connected to the exhaust vent.
[0014] The exhaust duct assembly provided by this utility model includes a duct and a separator. A sealed cavity is provided between the inner and outer walls of the duct. The separator is disposed within the cavity and divides the cavity into multiple noise reduction chambers that are sequentially distributed and independent of each other along the extension direction of the duct. Noise reduction holes are provided on the inner wall of the duct corresponding to each noise reduction chamber to form a Helmholtz resonant cavity. The volumes of the multiple noise reduction chambers are all different and / or the total area of the noise reduction holes at the multiple noise reduction chambers is all different, so that the noise reduction frequency bands of the multiple noise reduction chambers are all different. The exhaust duct assembly provided by this utility model can be applied to a range hood. During use, the gas discharged from the range hood enters the duct and generates noise. Since multiple noise reduction chambers are formed between the inner and outer walls of the duct and sequentially distributed along the extension direction of the duct, and each noise reduction chamber is provided with a noise reduction hole on the inner wall of the duct, each noise reduction chamber can form a Helmholtz resonant cavity. At this time, each noise reduction chamber can convert the noise sound waves transmitted to its location into heat energy dissipation under the Helmholtz resonance effect, thereby playing a noise reduction role. Since the noise waves are converted into heat energy and dissipated, the noise reduction cavity can effectively prevent noise waves from penetrating the outer wall of the pipe and generating noise radiation. It should be noted that whether the volumes of the multiple noise reduction cavities are different, or the total area of the noise reduction holes in the multiple noise reduction cavities is different, the noise absorption frequency band of the noise reduction cavity can be changed. Therefore, the multiple noise reduction cavities in this invention can also reduce noise waves of different frequency bands, thereby achieving noise reduction for different frequencies and further effectively improving the noise reduction effect of the exhaust duct assembly during the exhaust process.
[0015] Compared with the prior art, the exhaust pipe assembly provided by this utility model can convert noise energy into heat energy dissipation by utilizing the Helmholtz resonance effect through the noise reduction cavity formed between the inner and outer walls of the pipe, thereby playing a noise reduction role and reducing noise radiation. Furthermore, by changing the volume of the noise reduction cavity and / or the total area of the noise reduction holes, multiple noise reduction cavities can play a noise reduction role for different frequency bands, thereby achieving noise reduction for different frequency noises and further improving the noise reduction effect.
[0016] The smoke hood device provided by this utility model includes a smoke hood and the aforementioned exhaust pipe assembly; the smoke hood is provided with an exhaust port, and one end of the pipe is connected to the exhaust port. Since this smoke hood device includes the aforementioned exhaust pipe assembly, it has the same beneficial effects as the aforementioned exhaust pipe assembly. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the structure of the exhaust pipe assembly provided in an embodiment of the present utility model; Figure 2 for Figure 1 A cross-sectional view of the exhaust duct assembly in the middle; Figure 3 Another structural schematic diagram of the exhaust pipe assembly provided in this embodiment of the utility model; Figure 4 for Figure 3 A cross-sectional view of the exhaust duct assembly in the middle; Figure 5 Another structural schematic diagram of the exhaust pipe assembly provided in this embodiment of the utility model; Figure 6 for Figure 5 A cross-sectional view of the exhaust duct assembly in the middle; Figure 7 This is a schematic diagram of the structure of the smoke machine device provided in an embodiment of the present utility model.
[0019] Icons: 1-Pipe; 10-Noise Reduction Chamber; 11-Noise Reduction Hole; 12-Inner Pipe; 13-Outer Pipe; 2-Separator; 3-Air Outlet Seat; 4-Check Valve Seat; 5-Fastener; 6-Smoke Hood. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0022] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0023] Example: like Figures 1-4 As shown, the exhaust pipe assembly provided in this embodiment includes a pipe 1 and a separator 2; a sealed cavity is provided between the inner wall and the outer wall of the pipe 1, and the separator 2 is disposed in the cavity and divides the cavity into multiple noise reduction cavities 10 that are distributed sequentially and are independent of each other along the extension direction of the pipe 1; noise reduction holes 11 are provided on the inner wall of the pipe 1 corresponding to the noise reduction cavity 10 so that the noise reduction cavity 10 forms a Helmholtz resonant cavity, and the volumes of the multiple noise reduction cavities 10 are all different and / or the total area of the noise reduction holes 11 at the multiple noise reduction cavities 10 is all different, so that the noise reduction frequency bands of the multiple noise reduction cavities 10 are all different.
[0024] The exhaust duct assembly provided in this embodiment can be applied to a range hood. During use, the gas discharged from the range hood enters the duct 1 and generates noise. Since multiple noise-reducing cavities 10 are formed between the inner and outer walls of the duct 1, distributed sequentially along the extension direction of the duct 1, and each noise-reducing cavity 10 has a noise-reducing hole 11 on its inner wall, each noise-reducing cavity 10 can form a Helmholtz resonant cavity. At this time, each noise-reducing cavity 10 can convert the noise waves transmitted to its location into heat energy dissipation under the Helmholtz resonance effect, thereby achieving noise reduction. Because the noise waves are converted into heat energy dissipation, the noise-reducing cavity 10 can also effectively prevent noise waves from penetrating the outer wall of the duct 1 and generating noise radiation.
[0025] It should be noted that when the total area of multiple noise reduction holes 11 is the same but the volume of multiple noise reduction cavities 10 is different, or when the volume of multiple noise reduction cavities 10 is the same but the total area of multiple noise reduction holes 11 is different, the noise absorption frequency bands of multiple noise reduction cavities 10 are different. Therefore, when the airflow flows inside the pipe 1 and generates noise, as the sound waves pass through multiple noise reduction holes 11 and enter multiple noise reduction cavities 10 in sequence, different noise reduction cavities 10 will absorb the sound waves of the corresponding frequency band that match their acoustic characteristics and convert them into heat energy dissipation, thereby achieving a broadband noise reduction effect for different frequency bands of noise.
[0026] It can be seen that the multiple noise reduction cavities 10 in this embodiment can also play a noise reduction role for the different frequency bands of noise generated during the gas flow process, so that the exhaust pipe assembly can absorb and reduce noise in a wider frequency range, that is, the exhaust pipe assembly has a wide frequency noise reduction effect, further effectively improving the noise reduction effect of the exhaust pipe assembly on the exhaust process.
[0027] Compared with the prior art, the exhaust pipe assembly provided in this embodiment can convert noise energy into heat energy dissipation by utilizing the Helmholtz resonance effect through the noise reduction cavity 10 formed between the inner and outer walls of the pipe 1, thereby playing a noise reduction role and reducing noise radiation. Furthermore, by changing the volume of the noise reduction cavity 10 and / or the total area of the noise reduction holes 11, multiple noise reduction cavities 10 can play a noise reduction role for different frequency bands, thereby achieving noise reduction for different frequency noises and further improving the noise reduction effect.
[0028] The material of the separator 2 is not specifically limited. For example, the separator 2 can be a rigid material made of metal or alloy, or a flexible material made of rubber or plastic. In this embodiment, the separator 2 is preferably made of a flexible material and can absorb vibrations between the inner and outer walls of the pipe 1.
[0029] The partition 2, made of flexible material, not only serves to separate the cavity, but also provides support between the inner and outer walls of the pipe 1. At the same time, the partition 2 can absorb the vibration between the inner and outer walls of the pipe 1, thereby effectively suppressing the transmission of vibration between the inner and outer walls of the pipe 1 and further improving the noise reduction effect.
[0030] like Figure 2 As shown, there are multiple separators 2, which are distributed at intervals along the extension direction of the pipe 1, and the length of each noise reduction cavity 10 in the extension direction of the pipe 1 is different.
[0031] When the length of each noise reduction cavity 10 in the extension direction of the pipe 1 is different, the volume of each noise reduction cavity 10 is also different. At this time, each noise reduction cavity 10 has specific acoustic characteristics and can absorb and reduce noise in different frequency bands.
[0032] Specifically, let V be the volume of the noise reduction cavity 10, and let ƒ0 be the resonant frequency of the noise reduction cavity 10. ƒ0 and 1 / V is directly proportional to the volume of the noise reduction cavity 10. Therefore, increasing the volume V of the noise reduction cavity 10 will decrease its resonant frequency ƒ0; decreasing the volume V of the noise reduction cavity 10 will increase its resonant frequency ƒ0.
[0033] The different lengths of the multiple noise reduction cavities 10 in the extension direction of the pipe 1 can be achieved by adjusting the spacing between two adjacent partitions 2, or by changing the width of the partitions 2.
[0034] In this embodiment, the total area of the noise reduction holes 11 in the noise reduction cavity 10 refers to the sum of the areas of all the noise reduction holes 11 in the noise reduction cavity 10. For example, when there is only one noise reduction hole 11 in the noise reduction cavity 10, the total area of the noise reduction hole 11 is the area of that noise reduction hole 11; when there are multiple noise reduction holes 11 in the noise reduction cavity 10, the total area of the noise reduction holes 11 is the sum of the areas of the multiple noise reduction holes 11 in the noise reduction cavity 10.
[0035] Therefore, the number of noise reduction holes 11 at the multiple noise reduction cavities 10 is different, or the aperture of the noise reduction holes 11 at the multiple noise reduction cavities 10 is different, which can make the total area of the noise reduction holes 11 at the multiple noise reduction cavities 10 different. In this case, each noise reduction cavity 10 can also have specific acoustic characteristics, thereby absorbing and reducing noise in different frequency bands.
[0036] The number of noise reduction holes 11 at the noise reduction cavity 10 can be represented by the aperture ratio. It can be seen that when the volumes of multiple noise reduction cavities 10 are the same, multi-band noise reduction can be achieved by adjusting the aperture ratio or aperture area at multiple noise reduction cavities 10.
[0037] In this embodiment, the cavity is an annular cavity extending circumferentially along the pipe 1, the partition 2 is a sealing ring, and the outer annular surface of the partition 2 abuts against the outer annular surface of the cavity, and the inner annular surface of the partition 2 abuts against the inner annular surface of the cavity.
[0038] When the cavity is annular, each noise reduction cavity 10 can be distributed along the circumference of the pipe 1, thereby effectively increasing the distribution area of the noise reduction cavity 10 in the pipe 1 and further improving the noise reduction effect.
[0039] When the separator 2 is a sealing ring, the cavity inside the pipe 1 can be divided into multiple noise reduction chambers 10 along the axial direction of the pipe 1, while effectively ensuring the airtightness of each noise reduction chamber 10. When the pipe 1 is an aluminum foil tube, the sealing ring can also play a supporting role, effectively ensuring the stability of the noise reduction chamber 10.
[0040] In practical applications, the cavity inside pipe 1 can be formed by excavating between the inner and outer walls of a single-layer pipe or integrally formed with pipe 1 during casting. To simplify the manufacturing process of the cavity, such as... Figure 1 and Figure 2 As shown, in this embodiment, the preferred pipe 1 includes an inner pipe 12 and an outer pipe 13. The outer pipe 13 is sleeved outside the inner pipe 12, and the ends of the outer pipe 13 and the ends of the inner pipe 12 are correspondingly sealed and connected.
[0041] At this point, by limiting the inner diameter of the outer tube 13 to be greater than the outer diameter of the inner tube 12, a gap can be formed between the outer tube 13 and the inner tube 12, and this gap is the cavity.
[0042] like Figure 2 As shown, when the separator 2 is a sealing ring, the end of the outer tube 13 and the end of the inner tube 12 can be sealed together by the separator 2.
[0043] It should be noted that when pipe 1 includes inner pipe 12 and outer pipe 13, pipe 1 has a double-layer pipe structure. Compared with a single-layer pipe, the double-layer pipe structure can effectively reduce noise transmission by utilizing its internal cavity and double pipe wall, thereby playing a sound insulation role and further improving the noise reduction effect.
[0044] In this embodiment, there are no restrictions on the size of the inner pipe 12 and the outer pipe 13 in the pipe 1, as long as a cavity can be formed between the inner pipe 12 and the outer pipe 13.
[0045] In this embodiment, the outer diameter of the inner tube 12 is preferably 160-200 mm, and the outer diameter of the outer tube 13 is less than 350 mm.
[0046] Furthermore, to ensure that the cavity has sufficient thickness to meet the noise reduction requirements, and to prevent the cavity from being too thick and thus restricting the installation of the exhaust pipe assembly, this embodiment preferably has a difference of 5-100 mm between the outer diameter of the outer pipe 13 and the outer diameter of the inner pipe 12.
[0047] It should be noted that there are no restrictions on the material of pipe 1, as long as pipe 1 can meet the exhaust requirements of the range hood. For example, ... Figure 1 and Figure 2 As shown, pipe 1 is a retractable corrugated pipe. When pipe 1 includes an inner pipe 12 and an outer pipe 13, both the inner pipe 12 and the outer pipe 13 can be retractable corrugated pipes. Alternatively, as... Figure 3 and Figure 4 As shown, pipe 1 is a rigid pipe. When pipe 1 includes an inner pipe 12 and an outer pipe 13, both the inner pipe 12 and the outer pipe 13 can be rigid pipes.
[0048] like Figure 5 and Figure 6 As shown, the exhaust pipe assembly provided in this embodiment may further include an air outlet seat 3 and a check valve seat 4. The pipe 1 includes an air inlet and an air outlet. The air outlet seat 3 is fixed and connected to the air inlet of the pipe 1, and the check valve seat 4 is fixed and connected to the air outlet of the pipe 1. The air outlet seat 3 is used to be fixed and connected to the air outlet of the smoke hood device by fasteners 5, and the check valve seat 4 is used to be fixed to the wall and connected to the exhaust port on the wall.
[0049] like Figure 7 As shown, this embodiment also provides a range hood device, which includes a range hood 6 and the aforementioned exhaust pipe assembly; the range hood 6 is provided with an exhaust port, and one end of the pipe 1 is connected to the exhaust port. Since this range hood device includes the aforementioned exhaust pipe assembly, it can solve the same technical problem and achieve the same technical effect as the aforementioned exhaust pipe assembly, and will not be described in detail here.
[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. An exhaust duct assembly, characterized by, Includes pipes (1) and partitions (2); A sealed cavity is provided between the inner wall and the outer wall of the pipe (1). The separator (2) is provided in the cavity and divides the cavity into multiple noise reduction cavities (10) that are distributed sequentially and are independent of each other along the extension direction of the pipe (1). The inner wall of the pipe (1) corresponding to the noise reduction cavity (10) is provided with a noise reduction hole (11) so that the noise reduction cavity (10) forms a Helmholtz resonant cavity. The volumes of the multiple noise reduction cavities (10) are different and / or the total area of the noise reduction holes (11) at the multiple noise reduction cavities (10) is different so that the noise reduction frequency bands of the multiple noise reduction cavities (10) are different.
2. The exhaust duct assembly of claim 1, wherein, The separator (2) is made of a flexible material and is capable of absorbing vibrations between the inner and outer walls of the pipe (1).
3. The exhaust duct assembly of claim 1, wherein, There are multiple partitions (2), which are distributed at intervals along the extension direction of the pipe (1), and the length of each noise reduction cavity (10) in the extension direction of the pipe (1) is different.
4. The exhaust duct assembly of claim 1, wherein, The number of noise reduction holes (11) at the multiple noise reduction cavities (10) is different, or the aperture of the noise reduction holes (11) at the multiple noise reduction cavities (10) is different.
5. The exhaust duct assembly of any one of claims 1-4, wherein, The cavity is an annular cavity extending circumferentially along the pipe (1), the partition (2) is a sealing ring, and the outer annular surface of the partition (2) abuts against the outer annular surface of the cavity, and the inner annular surface of the partition (2) abuts against the inner annular surface of the cavity.
6. The exhaust duct assembly of claim 5, wherein, The pipe (1) includes an inner pipe (12) and an outer pipe (13). The outer pipe (13) is sleeved outside the inner pipe (12), and the ends of the outer pipe (13) and the ends of the inner pipe (12) are correspondingly sealed and connected.
7. The exhaust duct assembly of claim 6, wherein, The difference between the outer diameter of the outer tube (13) and the outer diameter of the inner tube (12) is 5-100 mm.
8. The exhaust duct assembly of any one of claims 1-4, wherein, The pipe (1) is a retractable corrugated pipe.
9. The exhaust duct assembly of any one of claims 1-4, wherein, The pipe (1) is a rigid pipe.
10. A range hood device, characterized by, Includes a range hood (6) and an exhaust duct assembly as described in any one of claims 1-9; The smoke machine (6) is provided with an exhaust port, and one end of the pipe (1) is connected to the exhaust port.