Double-layer noise reduction air guide ring and fan thereof

Abstract

The application discloses a double-layer noise reduction air guide ring, which comprises an inner air guide ring layer and an outer air guide ring layer. The inner air guide ring layer comprises a circular ring segment, a mounting panel, an inlet flow guide segment and an outlet diffuser segment. The inlet flow guide segment and the outlet diffuser segment are fixedly connected with the two ends of the circular ring segment respectively. The inlet flow guide segment is in a circular arc shape. The mounting panel is fixedly connected with the side of the inlet flow guide segment, which is away from the circular ring segment. The outer air guide ring layer comprises a flat segment, a circular arc segment and a partition plate. The end of the circular arc segment, which is close to the inner air guide ring layer, is provided with an outer layer outlet end. The end of the circular arc segment, which is away from the inner air guide ring layer, is provided with an outer layer inlet end. The mounting panel and the flat segment are provided with a connecting structure. The partition plate is provided with a plurality of partition plates. The resonant cavities between the adjacent partition plates are different in size. The application further discloses a fan comprising the double-layer noise reduction air guide ring. The application has the advantages of high fan efficiency and low air inlet noise.

Description

Technical Field

[0001] This invention relates to the technical field of air guide rings, specifically to a double-layer noise-reducing air guide ring and its fan. Background Technology

[0002] A fan is a machine that uses input mechanical energy to increase gas pressure and discharge gas. With the development of technology, people's requirements for the quietness of fans are also constantly increasing.

[0003] Chinese invention patent application CN114635862A discloses an overlapping axial flow fan, including a guide ring, an impeller hub, and blades. The blade roots are connected to the impeller hub, and the blades are spaced apart circumferentially along the impeller hub. The guide ring is fitted over the blades, and there is a gap between the blade tips and the guide ring. The chord length of the blades increases and then decreases radially from the blade roots to the blade tips, and adjacent blades overlap when projected along the axial direction. The beneficial effects of this invention are: increasing the impeller's work capacity while maintaining the same external dimensions, ensuring flow rate and pressure; and reducing the blade installation angle and tip chord length while maintaining the impeller's work capacity, thereby improving fan efficiency and reducing noise.

[0004] The aforementioned overlapping axial flow fan's guide ring structure results in the blades being close to the guide ring inlet, causing airflow turbulence at the inlet, leading to higher noise levels and lower efficiency. Therefore, the existing fan structure suffers from high noise and low efficiency. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention aims to provide a double-layer noise-reducing air guide ring, which includes an inner layer and an outer layer of the air guide ring, and also provides a fan that includes the above-mentioned double-layer noise-reducing air guide ring. The double-layer noise-reducing air guide ring has the advantages of high fan efficiency and low intake noise.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows:

[0007] A double-layer noise-reducing air guide ring includes an inner layer and an outer layer. The inner layer includes a circular section, a mounting panel, an inlet guide section, and an outlet diffuser section. The inlet guide section and the outlet diffuser section are fixedly connected to both ends of the circular section. The inlet guide section is arc-shaped. The mounting panel is fixedly connected to the side of the inlet guide section away from the circular section. The outer layer includes a planar section, an arc-shaped section, and partitions. The arc-shaped section has an outer layer outlet end near the inner layer and an outer layer inlet end away from the inner layer. A connection structure is provided between the mounting panel and the planar section. Multiple partitions are provided, located between the planar section and the arc-shaped section. A resonant cavity is provided between adjacent partitions.

[0008] This design allows the resonant cavity to reduce low-frequency noise generated by the fan. On one hand, it optimizes sound quality; on the other hand, because low-frequency sound waves have longer wavelengths, they are less likely to reflect out of the resonant cavity, thus improving noise reduction. After the airflow is rectified by the outer layer of the air guide ring, it is then further rectified by the inner layer, improving the rectification effect of the intake airflow and reducing turbulence at the fan inlet. This results in higher fan efficiency and lower intake noise.

[0009] Preferably, the resonant cavity volumes of the multiple partitions are of different sizes.

[0010] By using this configuration, since the resonant cavity has different sizes and therefore different natural frequencies, it is possible to reduce noise at multiple frequencies simultaneously using resonant cavities of different sizes.

[0011] Preferably, the axial height of the inner layer of the air guide ring is H, and the axial height of the outer layer of the air guide ring is H1, wherein 0.1H≦H1≦0.5H.

[0012] This design avoids making the resonant cavity too small, which helps the resonant cavity reduce low-frequency noise and ensures the rectification effect of the outer layer of the air guide ring on the inlet airflow of the fan; it also avoids making the overall length of the fan too large, which would affect the installation of the fan in environments that require ventilation and heat dissipation.

[0013] Preferably, the axial height of the inlet guide section is H2, and the axial distance between the annular section and the outer outlet end is H3, wherein 0.1H2≦H3≦1.5H2.

[0014] This setup ensures a certain gap between the outer outlet and the inner layer of the air guide ring, allowing sound waves generated during fan operation to enter the resonant cavity through the gap; it also prevents the gap between the inner and outer outlet layers of the air guide ring from becoming too large, which would cause the resonant cavity to fail in its ability to dissipate noise energy.

[0015] Preferably, the diameter of the annular segment is D, and the diameter of the outer outlet end is D1, wherein 0.9D≦D1≦D.

[0016] This configuration prevents the outer diameter of the air guide ring from being too small, ensuring the fan's operating efficiency. The setting of 0.9D≦D1≦D prevents the airflow from easily forming vortices at the outer outlet, thus reducing fan operating noise.

[0017] Preferably, the diameter of the outer outlet end is D1, and the maximum diameter of the inlet guide section is D2, where D1≦D2.

[0018] This design prevents a large step from forming between the inlet guide section and the outer outlet, thus ensuring the operating efficiency of the fan and making it suitable for large-volume fans.

[0019] Preferably, the maximum diameter of the inlet guide section is D2, and the diameter of the outer inlet end is D3, where D3 > D2.

[0020] By increasing the diameter of the outer inlet end of the outer layer of the air guide ring, the rectification effect of the outer layer of the air guide ring on the inlet airflow of the fan can be improved, thereby increasing the efficiency of the fan.

[0021] Preferably, the distance between the outer outlet end and the inlet guide section is T, and the axial height of the outer layer of the air guide ring is H1, where 0 < T ≦ 0.3H1.

[0022] This configuration can reduce the natural frequency of the resonant cavity, thereby effectively reducing the low-frequency noise emitted by the fan, improving the sound quality of the fan, and reducing fan noise.

[0023] Preferably, the inner wall of the resonant cavity is provided with sound-absorbing material.

[0024] With this setup, the low-frequency noise energy can be dissipated through the resonant cavity, while the sound-absorbing material reduces high-frequency noise, effectively reducing the noise emitted during the operation of the fan.

[0025] As a preferred embodiment, a fan includes the aforementioned double-layer noise-reducing air guide ring.

[0026] By incorporating a double-layered noise-reducing air guide ring within the fan, the resonant cavity lowers the low-frequency noise generated by the fan. This optimizes sound quality and, because low-frequency sound waves have longer wavelengths, are less likely to reflect out of the resonant cavity, thus enhancing noise reduction. The outer layer of the air guide ring rectifies the airflow, followed by a secondary rectification by the inner layer, further improving the rectification of the intake airflow and reducing turbulence at the fan inlet. This results in higher fan efficiency and lower intake noise.

[0027] Compared with the prior art, the present invention has achieved beneficial technical effects:

[0028] 1. There is a gap between the outer outlet end and the inlet guide section. The noise generated during the operation of the fan is injected into the resonant cavity through the gap between the outer outlet end and the inlet guide section. When the frequency of the sound wave injected into the resonant cavity is close to the natural frequency of the resonant cavity, the air in the resonant cavity will vibrate strongly. During the vibration process, the sound energy is consumed due to the need to overcome frictional resistance, thereby reducing the noise at that frequency.

[0029] 2. In this application, the resonant cavity is used to reduce the low-frequency noise generated by the fan. On the one hand, it can optimize the sound quality, and on the other hand, since the wavelength of low-frequency sound waves is longer, they are not easily reflected out of the resonant cavity, thereby improving the noise reduction effect.

[0030] 3. By setting the outer layer of the air guide ring, the air intake length of the fan is increased. This allows the airflow to be rectified by the outer layer of the air guide ring and then rectified again by the inner layer of the air guide ring. This improves the rectification effect of the air intake airflow, reduces the turbulence of the airflow at the fan inlet, and achieves the advantages of higher fan efficiency and lower intake noise. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a double-layer noise reduction air guide ring in Embodiment 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the annular segment and the arc segment in Embodiment 1 of the present invention;

[0033] Figure 3 This is a schematic diagram of the connection structure in Embodiment 1 of the present invention;

[0034] Figure 4 This is a schematic diagram of D, D1, D2, and D3 in Embodiment 1 of the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of a fan in Embodiment 2 of the present invention.

[0036] The technical features referred to by the various reference numerals in the accompanying drawings are as follows:

[0037] 10. Double-layer noise-reducing air guide ring; 11. Inner layer of air guide ring; 12. Circular section; 13. Mounting panel; 14. Inlet guide section; 15. Outlet diffuser section; 21. Outer layer of air guide ring; 22. Planar section; 23. Arc section; 24. Baffle; 25. Outer outlet end; 26. Outer inlet end; 31. Resonance cavity; 41. Connecting ring; 42. Connecting plate; 43. Fixing component; 50. Impeller. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments. However, the scope of protection of this invention is not limited to the specific embodiments described below.

[0039] Example 1:

[0040] refer to Figure 1 and Figure 2 A double-layer noise reduction air guide ring 10 includes an inner layer 11 and an outer layer 21. The inner layer 11 includes an annular section 12, a mounting panel 13, an inlet guide section 14, and an outlet diffuser section 15. The inlet guide section 14 and the outlet diffuser section 15 are fixedly connected to both ends of the annular section 12, respectively. The inlet guide section 14 is arc-shaped. The mounting panel 13 is fixedly connected to the side of the inlet guide section 14 away from the annular section 12. The outer layer 21 includes a planar section 22, an arc section 23, and a partition 24. The arc section 23 has an outer outlet end 25 at the end near the inner layer 11 and an outer inlet end 26 at the end away from the inner layer 11. The arc section 23 can guide the inlet airflow and achieve the effect of rectification. A connecting structure is provided between the mounting panel 13 and the flat section 22. Multiple partitions 24 are provided, located between the flat section 22 and the arc section 23. The partitions 24 are distributed circumferentially around the axis of the outer layer 21 of the air guide ring. Multiple resonant cavities 31 of different volumes are provided between multiple adjacent partitions 24. The multiple partitions 24 are distributed at unequal angles around their circumferences, resulting in different sizes of the multiple resonant cavities 31. The inner wall of the resonant cavity 31 is lined with sound-absorbing material; in this embodiment, the sound-absorbing material is sound-absorbing cotton. (Reference) Figure 3 The connecting structure includes a connecting ring 41, which is fixedly connected to the planar segment 22. A connecting plate 42 is fixedly connected to the connecting ring 41. The connecting plate 42 is provided with a fixing member 43 that connects to the mounting panel 13. In this embodiment, the fixing member 43 is a screw that passes through the connecting plate 42 and is threadedly connected to the mounting panel 13. The connecting ring 41, the outer layer 21 of the air guide ring, the inner layer 11 of the air guide ring, and the partition plate 24 surround to form a resonant cavity 31.

[0041] refer to Figure 1 and Figure 4The axial height of the inner layer 11 of the air guide ring is H, and the axial height of the outer layer 21 of the air guide ring is H1, where 0.1H≦H1≦0.5H. The axial height of the inlet guide section 14 is H2, and the axial distance between the annular section 12 and the outer outlet end 25 is H3, where 0.1H2≦H3≦1.5H2. The diameter of the annular section 12 is D, and the diameter of the outer outlet end 25 is D1, where 0.9D≦D1≦D. The diameter of the outer outlet end 25 is D1, and the maximum diameter of the inlet guide section 14 is D2, where D1≦D2. The maximum diameter of the inlet guide section 14 is D2, and the diameter of the outer inlet end 26 is D3, where D3>D2. The distance between the outer outlet end 25 and the inlet guide section 14 is T, and the axial height of the outer layer 21 of the guide ring is H1, where 0 < T ≦ 0.3H1.

[0042] According to the Helmholtz resonance calculation formula, the resonance frequency of resonant cavity 31 can be calculated as follows:

[0043]

[0044] Where W is the natural frequency of the resonant cavity 31, C is the speed of sound, V is the cavity volume of the resonant cavity 31, S is the inlet area of ​​the resonant cavity 31, and l is the inlet length of the resonant cavity 31. It can be seen from the above formula that different cavity volumes, cavity inlet areas, and cavity inlet lengths all affect the cavity resonant frequency. The cavity space can be set according to the noise frequency to be reduced as needed.

[0045] This embodiment has the following advantages:

[0046] A gap exists between the outer outlet end 25 and the inlet guide section 14. Noise generated during fan operation enters the resonant cavity 31 through this gap. When the frequency of the sound wave entering the resonant cavity 31 is close to its natural frequency, the air inside the cavity vibrates strongly. During this vibration, the sound energy is consumed due to the need to overcome frictional resistance, thus reducing the noise at that frequency. Because the resonant cavities 31 vary in size and thus have different natural frequencies, multiple frequencies of noise can be reduced simultaneously using resonant cavities 31 of different sizes.

[0047] In this application, the resonant cavity 31 is used to reduce the low-frequency noise generated by the fan. On the one hand, it can optimize the sound quality, and on the other hand, since the wavelength of low-frequency sound waves is longer, it is not easy to reflect out of the resonant cavity 31, thereby improving the noise reduction effect.

[0048] By setting the outer layer 21 of the air guide ring, the air intake length of the fan is increased. This allows the airflow to be rectified by the outer layer 21 of the air guide ring, and then rectified again by the inner layer 11 of the air guide ring. This improves the rectification effect of the air intake airflow, reduces the turbulence of the airflow at the fan inlet, and achieves the advantages of high fan efficiency and low intake noise.

[0049] 0.1H≦H1, to avoid the resonant cavity 31 being too small, which helps the resonant cavity 31 to reduce low-frequency noise and ensures the rectification effect of the outer layer 21 of the air guide ring on the inlet airflow of the fan; H1≦0.5H, to avoid the overall length of the fan being too large, which would affect the installation of the fan in environments requiring ventilation and heat dissipation, and to prevent the outer layer of the air guide ring from having a significant impact on the installation and use of the fan in situations where ventilation and heat dissipation are required.

[0050] 0.1H2≦H3 ensures a certain gap between the outer outlet end 25 and the inner layer 11 of the air guide ring, allowing the sound waves generated during the operation of the fan to enter the resonant cavity 31 through the gap; H3≦1.5H2 prevents the gap between the inner layer 11 of the air guide ring and the outer outlet end 25 from being too large, which would cause the noise energy dissipation effect in the resonant cavity 31 to fail.

[0051] The diameter of the outer layer 21 of the air guide ring is set to 0.9D≦D1 to prevent it from being too small, ensuring the air intake volume of the fan and thus guaranteeing its operating efficiency. If the outer layer 21 of the air guide ring is too small or too large, it will create a large step between the outer layer 21 and the inner layer 11. Therefore, by setting 0.9D≦D1≦D, the airflow is less likely to form vortices at the outer outlet end 25, thus reducing the fan's operating noise.

[0052] D1 is less than or equal to D2 to prevent a large step from forming between the inlet guide section 14 and the outer outlet end 25, reduce the resistance of the inlet guide section 14 to the inlet airflow of the fan, and ensure the operating efficiency of the fan. It is suitable for large air volume fans.

[0053] By setting D3 > D2, the diameter of the outer inlet end 26 of the outer layer 21 of the air guide ring is increased, which can improve the rectification effect of the outer layer 21 of the air guide ring on the inlet airflow of the fan and thus improve the efficiency of the fan.

[0054] By setting 0 < T ≦ 0.3H1, the area of ​​the gap between the outer outlet end 25 and the inlet guide section 14 is made smaller, while the cavity volume of the resonant cavity 31 is larger, ensuring that the resonant cavity 31 can reduce the noise emitted by the fan. The smaller area of ​​the gap between the outer outlet end 25 and the inlet guide section 14 can reduce the natural frequency of the resonant cavity 31, enabling the resonant cavity 31 to effectively reduce the low-frequency noise emitted by the fan, thereby improving the sound quality of the fan and reducing fan noise.

[0055] By incorporating sound-absorbing materials, high-frequency noise generated during fan operation can be effectively absorbed. This allows the resonant cavity 31 to dissipate low-frequency noise energy while the sound-absorbing materials reduce high-frequency noise, effectively lowering the noise emitted during fan operation.

[0056] The connecting ring 41 connects the inner layer 11 and the outer layer 21 of the air guide ring while also sealing the resonant cavity 31. The connecting plate 42 and the connecting ring 41 are fixed to the mounting panel 13 by the fastener 43, allowing the inner layer 11 to provide support to the outer layer 21 through the connecting ring 41, thus achieving the function of connecting the inner layer 11 and the outer layer 21 of the air guide ring via the connecting structure.

[0057] Example 2:

[0058] refer to Figure 5 A fan includes a wind turbine 50 and a double-layer noise reduction air guide ring 10 as described in Embodiment 1. The wind turbine 50 can be an axial flow fan wind turbine 50 or a vortex fan wind turbine 50. In this embodiment, the wind turbine 50 is an axial flow fan wind turbine 50.

[0059] This embodiment has the following advantages:

[0060] Example 3:

[0061] A double-layer noise reduction air guide ring, which differs from Embodiment 1 in that the connecting ring and the outer air guide ring are eccentrically set, and the axis of the connecting ring is parallel to and does not coincide with the axis of the outer air guide ring.

[0062] With this setting:

[0063] By staggering the connecting ring and the outer air guide ring, multiple resonant cavities can be designed with different volumes, which facilitates the design and adjustment of the resonant cavities and makes installation and manufacturing easier.

[0064] By setting a double-layer noise-reducing air guide ring 10 in the fan, the advantages of high fan efficiency and low intake noise are achieved.

[0065] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the invention.

Claims

1. A double-layer noise-reducing air guide ring (10), comprising an inner layer (11) of the air guide ring, characterized in that: It also includes an outer layer (21) of the air guide ring. The inner layer (11) of the air guide ring includes an annular section (12), a mounting panel (13), an inlet guide section (14), and an outlet diffuser section (15). The inlet guide section (14) and the outlet diffuser section (15) are fixedly connected to both ends of the annular section (12). The inlet guide section (14) is arc-shaped. The mounting panel (13) is fixedly connected to the side of the inlet guide section (14) away from the annular section (12). The outer layer (21) of the air guide ring includes a planar section (22), an arc section (23), and a baffle (24). The planar section (22) is arranged sequentially along the airflow direction. An arc segment (23) is provided with an outer layer outlet end (25) at one end near the inner layer (11) of the air guide ring, and an outer layer inlet end (26) at one end away from the inner layer (11) of the air guide ring. The end of the arc segment (23) away from the inner layer (11) of the air guide ring is connected to the inner side of the planar segment (22). A connection structure is provided between the mounting panel (13) and the planar segment (22). Multiple partitions (24) are provided. The partitions (24) are located between the planar segment (22) and the arc segment (23). A resonant cavity (31) is provided between adjacent partitions (24). The connection structure includes a connecting ring (41), which is fixedly connected to the outer side of the planar segment (22). A connecting plate (42) is fixedly connected to the connecting ring (41). The connecting plate (42) is provided with a fixing member (43) connected to the mounting panel (13). The connecting ring (41), the outer layer (21) of the air guide ring, the inner layer (11) of the air guide ring, and the partition plate (24) surround to form the resonant cavity (31). The resonant cavities (31) between the multiple partitions (24) are of different sizes; The axial height of the inner layer (11) of the air guide ring is H, and the axial height of the outer layer (21) of the air guide ring is H1, wherein 0.1H≦H1≦0.5H; The axial height of the inlet guide section (14) is H2, and the axial distance between the annular section (12) and the outer outlet end (25) is H3, wherein 0.1H2≦H3≦1.5H2; The diameter of the annular segment (12) is D, and the diameter of the outer outlet end (25) is D1, wherein 0.9D≦D1≦D.

2. The double-layer noise-reducing air guide ring (10) according to claim 1, characterized in that, The diameter of the outer outlet end (25) is D1, and the maximum diameter of the inlet guide section (14) is D2, where D1≦D2.

3. The double-layer noise-reducing air guide ring (10) according to claim 1, characterized in that, The maximum diameter of the inlet guide section (14) is D2, and the diameter of the outer inlet end (26) is D3, where D3 > D2.

4. The double-layer noise-reducing air guide ring (10) according to claim 1, characterized in that, The distance between the outer outlet end (25) and the inlet guide section (14) is T, and the axial height of the outer layer (21) of the air guide ring is H1, where 0 < T ≦ 0.3H1.

5. The double-layer noise-reducing air guide ring (10) according to claim 1, characterized in that, The inner wall of the resonant cavity (31) is provided with sound-absorbing material.

6. A fan, characterized in that: Includes the double-layer noise-reducing air guide ring (10) according to any one of claims 1 to 5.

Images