CN115823021A - Double-layer noise-reduction air guide ring and fan thereof - Google Patents
Double-layer noise-reduction air guide ring and fan thereof Download PDFInfo
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- CN115823021A CN115823021A CN202211666478.9A CN202211666478A CN115823021A CN 115823021 A CN115823021 A CN 115823021A CN 202211666478 A CN202211666478 A CN 202211666478A CN 115823021 A CN115823021 A CN 115823021A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a double-layer noise-reduction wind guide ring, which comprises a wind guide ring inner layer and a wind guide ring outer layer, wherein the wind guide ring inner layer comprises a circular ring section, a mounting panel, an inlet flow guide section and an outlet diffusion section, the inlet flow guide section and the outlet diffusion section are respectively and fixedly connected with two ends of the circular ring section, the inlet flow guide section is in a circular arc shape, the mounting panel is fixedly connected with one side, far away from the circular ring section, of the inlet flow guide section, the wind guide ring outer layer comprises a plane section, a circular arc section and partition plates, an outer layer outlet end is arranged at one end, close to the wind guide ring inner layer, of the circular arc section, an outer layer inlet end is arranged at one end, far away from the wind guide ring inner layer, of the circular arc section, a connecting structure is arranged between the mounting panel and the plane section, the partition plates are arranged in a plurality, resonant cavities are arranged between the adjacent partition plates, and the volume sizes of the resonant cavities between the partition plates are different from each other. The fan comprises the double-layer noise reduction wind guide ring. The invention has the following beneficial effects: the advantages of high fan efficiency and low air inlet noise are achieved.
Description
Technical Field
The invention relates to the technical field of wind guide rings, in particular to a double-layer noise-reduction wind guide ring and a fan thereof.
Background
The fan is a machine which increases the gas pressure and discharges the gas by means of the input mechanical energy. With the development of the technology, the requirement of people on the quietness of the fan is continuously improved.
The Chinese patent application with the publication number of CN114635862A discloses an overlapped axial flow fan, which comprises an air guide ring, an impeller hub and blades, wherein blade roots of the blades are connected with the impeller hub, the blades are arranged at intervals along the circumferential direction of the impeller hub, the air guide ring is sleeved outside the blades, gaps exist between blade tops of the blades and the air guide ring, the chord length of the blades is increased and then decreased along the radial direction from the blade roots to the blade tops of the blades, and the overlapped parts exist between two adjacent blades along the projection of the axial direction. The invention has the following beneficial effects: under the condition that the overall dimension is not changed, the working capacity of the impeller is increased, the flow and the pressure are ensured, and the installation angle and the blade top chord length of the blade are reduced on the premise of ensuring the working capacity of the impeller, so that the effects of improving the efficiency of the fan and reducing the noise are achieved.
The arrangement of the wind guide ring structure of the overlapped axial flow fan leads the blades to be closer to the inlet of the wind guide ring, so that the fan forms airflow turbulence at the inlet of the wind guide ring, the noise of the fan is larger, and the efficiency is lower. Therefore, the fan structure in the prior art has the problems of higher noise and lower working efficiency.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a double-layer noise-reduction wind guide ring which comprises a wind guide ring inner layer and a wind guide ring outer layer, and a fan which comprises the double-layer noise-reduction wind guide ring.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a double-layer noise-reduction wind guide ring comprises a wind guide ring inner layer and a wind guide ring outer layer, wherein the wind guide ring inner layer comprises a circular ring section, a mounting panel, an inlet flow guide section and an outlet diffusion section, the inlet flow guide section and the outlet diffusion section are respectively fixedly connected with two ends of the circular ring section, the inlet flow guide section is in a circular arc shape, the mounting panel is fixedly connected with one side, far away from the circular ring section, of the inlet flow guide section, the wind guide ring outer layer comprises a plane section, a circular arc section and a plurality of partition plates, an outer outlet end is arranged at one end, close to the wind guide ring inner layer, of the circular arc section, an outer inlet end is arranged at one end, far away from the wind guide ring inner layer, of the circular arc section, a connecting structure is arranged between the mounting panel and the plane section, the partition plates are arranged in a plurality, the partition plates are positioned between the plane section and the circular arc section, and a resonant cavity is arranged between the adjacent partition plates.
By such an arrangement: the resonant cavity reduces the low frequency noise that the fan produced, can optimize the sound quality on the one hand, on the other hand is difficult to reflect the resonant cavity because the acoustic wavelength of low frequency is longer to can play the effect that improves the noise reduction effect. After the air guide ring is used for rectifying the air flow, the secondary rectification is performed on the air flow through the air guide ring inner layer, the rectification effect on the air flow entering the air can be improved, the turbulence of the air flow entering the fan is reduced, and the advantages of high fan efficiency and low air inlet noise are achieved.
Preferably, the volumes of the resonant cavities between the partition plates are different from each other
By such an arrangement: because the resonant cavities have different sizes and different natural frequencies, the noise of various frequencies can be simultaneously reduced by the resonant cavities with different volumes.
Preferably, the axial height of the inner layer of the wind guide ring is H, and the axial height of the outer layer of the wind guide ring is H1, wherein 0.1H ≦ H1 ≦ 0.5H.
By means of the arrangement, the phenomenon that the volume of the resonant cavity is too small is avoided, low-frequency noise is weakened by the resonant cavity, and the rectification effect of the outer layer of the air guide ring on airflow at the inlet of the fan is guaranteed; the problem that the whole length of the fan is too large to affect the installation of the fan in an environment needing ventilation and heat dissipation is avoided.
Preferably, the axial height of the inlet guide section is H2, and the axial distance between the annular segment and the outlet end of the outer layer is H3, where 0.1H2 is less than or equal to H3 is less than or equal to 1.5H2.
By such an arrangement: a certain gap is ensured between the outlet end of the outer layer and the inner layer of the air guide ring, so that sound waves generated in the running process of the fan can enter the resonant cavity through the gap; the failure of the consumption effect of noise and sound energy in the resonant cavity caused by the overlarge gap between the outlet ends of the inner layer and the outer layer of the air guide ring is prevented.
Preferably, the diameter of the circular ring section is D, and the diameter of the outlet end of the outer layer is D1, where 0.9D ≦ D1 ≦ D.
By such an arrangement: the diameter of the outer layer of the air guide ring is prevented from being too small, and the operation efficiency of the fan is ensured. Through the setting that D1 is less than or equal to 0.9D, the air current is difficult to form the vortex at outer exit end department, plays the effect that reduces fan operating noise.
Preferably, the diameter of the outlet end of the outer layer is D1, the maximum diameter of the inlet guide section is D2, and D1 is less than or equal to D2.
By such an arrangement: prevent to form great ladder between import water conservancy diversion section and the outer exit end, play the effect of guaranteeing fan operating efficiency, can be applicable to big amount of wind type fan.
Preferably, the largest diameter of the inlet guide section is D2, and the diameter of the inlet end of the outer layer is D3, wherein D3 is more than D2.
By such an arrangement: the diameter of outer entrance point on the increase wind-guiding circle skin can improve the outer rectification effect to fan import air current of wind-guiding circle, plays the effect that improves fan efficiency.
Preferably, the distance between the outlet end of the outer layer and the inlet flow guide section is T, the axial height of the outer layer of the wind guide ring is H1, and T is more than 0 and less than or equal to 0.3H1.
By such an arrangement: the resonant cavity can play a role in reducing the natural frequency of the resonant cavity, so that the resonant cavity can effectively reduce the low-frequency noise emitted by the fan, and the effects of improving the sound quality of the fan and reducing the noise of the fan are achieved.
Preferably, the inner wall of the resonant cavity is provided with a sound absorbing material.
By such an arrangement: can consume the low frequency noise sound energy through the resonant cavity simultaneously, sound absorbing material reduces high frequency noise, can effectively reduce the noise that the fan operation in-process sent.
Preferably, the fan comprises the double-layer noise-reduction wind guide ring.
By such an arrangement: through set up the double-deck wind guide circle of making an uproar that falls in the fan, the resonant cavity reduces the low frequency noise that the fan produced, can optimize the sound quality on the one hand, and on the other hand is difficult to reflect out the resonant cavity because the sound wave wavelength of low frequency is longer to can play the effect that improves the noise reduction effect. After the air guide ring is used for rectifying the air flow, the secondary rectification is performed on the air flow through the air guide ring inner layer, the rectification effect on the air flow entering the air can be improved, the turbulence of the air flow entering the fan is reduced, and the advantages of high fan efficiency and low air inlet noise are achieved.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the outer exit end and the inlet guide section are provided with gaps, noise generated in the running process of the fan is emitted into the resonant cavity through the gaps between the outer exit end and the inlet guide section, and when the frequency of sound waves emitted into the resonant cavity is close to the natural frequency of the resonant cavity, air in the resonant cavity can generate strong vibration.
2. In this application, the resonant cavity is used for reducing the low frequency noise that the fan produced, can optimize the sound quality on the one hand, and on the other hand is difficult to reflect out the resonant cavity because the acoustic wave wavelength of low frequency is longer to can play the effect that improves noise reduction effect.
3. Through the outer setting of wind-guiding circle for the fan length of admitting air increases, thereby can carry out the rectification back to the air current through wind-guiding circle is outer, and the rethread wind-guiding circle inlayer carries out the secondary rectification to the air current, can improve the rectification effect to the air current that admits air of wind-guiding, reduces the vortex of fan import air current, reaches the advantage that fan efficiency is higher, the noise of admitting air is lower.
Drawings
Fig. 1 is a schematic structural view of a double-layer noise-reducing wind guide ring in embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a circular ring segment and a circular arc segment in embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a connecting structure in embodiment 1 of the invention;
FIG. 4 is a schematic representation of D, D, D2, D3 in example 1 of the present invention;
fig. 5 is a schematic structural view of a fan in embodiment 2 of the present invention.
Wherein, the technical characteristics that each reference numeral refers to are as follows:
10. double-layer noise reduction wind guide rings; 11. an inner layer of the wind guide ring; 12. a circular ring section; 13. installing a panel; 14. an inlet flow guide section; 15. an outlet diffuser section; 21. an outer layer of the wind guide ring; 22. a planar section; 23. a circular arc section; 24. a partition plate; 25. an outer layer outlet end; 26. an outer inlet end; 31. a resonant cavity; 41. a connecting ring; 42. a connecting plate; 43. a fixing member; 50. and a wind wheel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.
Example 1:
referring to fig. 1 and 2, a double-layer noise-reduction wind guide ring 10 comprises a wind guide ring inner layer 11 and a wind guide ring outer layer 21, wherein the wind guide ring inner layer 11 comprises a circular ring section 12, a mounting panel 13, an inlet guide section 14 and an outlet diffusion section 15, the inlet guide section 14 and the outlet diffusion section 15 are respectively and fixedly connected with two ends of the circular ring section 12, the inlet guide section 14 is arc-shaped, the mounting panel 13 and one side, far away from the circular ring section 12, of the inlet guide section 14 are fixedly connected, the wind guide ring outer layer 21 comprises a plane section 22, an arc section 23 and a partition plate 24, an outer layer outlet end 25 is arranged at one end, close to the wind guide ring inner layer 11, of the arc section 23 is provided with an outer layer inlet end 26, far away from the wind guide ring inner layer 11, and the arc section 23 can play a role of guiding inlet airflow, so that a rectification effect is realized. A connecting structure is arranged between the installation panel 13 and the plane section 22, a plurality of partition plates 24 are arranged, the partition plates 24 are located between the plane section 22 and the arc section 23, the partition plates 24 are circumferentially distributed by taking the axis of the outer layer 21 of the wind guide ring as the center, a plurality of resonant cavities 31 with different volumes are arranged between the adjacent partition plates 24, and the circumferences of the plurality of partition plates 24 are distributed at different angles, so that the volumes of the resonant cavities 31 are different. The inner wall of the resonant cavity 31 is provided with a sound-absorbing material, which in this embodiment is a sound-absorbing cotton. Referring to fig. 3, the connection structure includes a connection ring 41, the connection ring 41 is fixedly connected to the plane section 22, the connection ring 41 is fixedly connected to a connection plate 42, the connection plate 42 is provided with a fixing member 43 connected to the installation panel 13, in this embodiment, the fixing member 43 is a screw penetrating through the connection plate 42 and threadedly connected to the installation panel 13. The connecting ring 41, the outer layer 21 of the wind-guiding ring, the inner layer 11 of the wind-guiding ring and the partition plate 24 surround to form a resonant cavity 31.
Referring to fig. 1 and 4, the axial height of the inner layer 11 of the wind guide ring is H, and the axial height of the outer layer 21 of the wind 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 layer outlet end 25 is H3, wherein 0.1H2 is less than or equal to H3 is less than or equal to 1.5H2. The diameter of the circular ring section 12 is D, the diameter of the outlet end 25 of the outer layer is D1, wherein D1 is less than or equal to 0.9D. The diameter of the outer layer outlet end 25 is D1, the maximum diameter of the inlet guide section 14 is D2, and D1 is less than or equal to D2. The inlet inducer 14 has a maximum diameter D2 and the outer inlet end 26 has a diameter D3, where D3 > D2. The distance between the outer layer outlet end 25 and the inlet guide section 14 is T, the axial height of the outer layer 21 of the wind guide ring is H1, and T is more than 0 and less than or equal to 0.3H1.
According to the helmholtz resonance calculation formula, the resonance frequency of the resonance cavity 31 can be calculated as follows:
wherein W is the natural frequency of the resonant cavity 31, C is the sound velocity, 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, and the cavity space setting can be performed according to the noise frequency reduced as required.
The embodiment has the following advantages:
a gap is formed between the outer layer outlet end 25 and the inlet guide section 14, noise generated in the operation process of the fan is emitted into the resonant cavity 31 through the gap between the outer layer outlet end 25 and the inlet guide section 14, when the frequency of sound waves emitted into the resonant cavity 31 is close to the natural frequency of the resonant cavity 31, air in the resonant cavity 31 can generate strong vibration, and in the vibration process, due to the fact that friction resistance needs to be overcome, sound energy is consumed, and then the noise under the frequency is reduced. Since the resonant cavities 31 have different volumes and different natural frequencies, the noise of various frequencies can be reduced by the resonant cavities 31 having different volumes.
In this application, resonant cavity 31 is used for reducing the low frequency noise that the fan produced, can optimize the sound quality on the one hand, and on the other hand is difficult to reflect resonant cavity 31 because the acoustic wavelength of low frequency is longer to can play the effect that improves the noise reduction effect.
Through the setting of wind-guiding circle outer 21 for the fan length increase that admits air, thereby can carry out the rectification back to the air current through wind-guiding circle outer 21, rethread wind-guiding circle inlayer 11 carries out the secondary rectification to the air current, can improve the rectification effect to the air current that admits air of wind, reduces the vortex of fan import air current, reaches the advantage that fan efficiency is higher, the noise of admitting air is lower.
0.1H is less than or equal to H1, so that the volume of the resonant cavity 31 is prevented from being too small, the resonant cavity 31 is favorable for weakening low-frequency noise, and the rectification effect of the outer layer 21 of the air guide ring on the air flow at the inlet of the fan can be ensured; h1 ≦ 0.5H, avoid the whole length of fan too big and influence the fan and install under the environment that needs ventilation cooling, prevent to lead to the outer great influence of causing to the installation and the use of wind circle in the occasion that needs the fan to carry out ventilation cooling.
0.1H2 is less than or equal to H3, so that a certain gap is formed between the outlet end 25 of the outer layer and the inner layer 11 of the air guide ring, and sound waves generated in the operation process of the fan can enter the resonant cavity 31 through the gap; h3 ≦ 1.5H2, and the phenomenon that the gap between the inner layer 11 and the outer layer outlet end 25 of the wind guide ring is too large to cause the failure of the consumption effect of the resonant cavity 31 on noise and sound energy is avoided.
0.9D ≦ D1 prevents that the diameter of wind-guiding circle outer layer 21 is too little, guarantees the intake air volume of fan to guarantee the operating efficiency of fan. Wind-guiding circle outer 21 is too little or too big, all can lead to forming great ladder between wind-guiding circle outer 21 and the wind-guiding circle inlayer 11 to through 0.9D ≦ D1 ≦ D's setting, the air current is difficult to form the vortex in outer exit end 25 department, plays the effect that reduces fan operating noise.
D1 is less than or equal to D2, prevents to form great ladder between import water conservancy diversion section 14 and the outer exit end 25, reduces the resistance that import water conservancy diversion section 14 caused to fan import air current, plays the effect of guaranteeing fan operating efficiency, can be applicable to big amount of wind type fan.
Through the setting that D3 > D2, the diameter of outer entrance point 26 on the outer 21 of increase wind-guiding circle can improve the rectification effect of wind-guiding circle outer 21 to fan import air current, plays the effect that improves fan efficiency.
Through the arrangement of T ≦ 0.3H1 of 0 < T ≦ 5363, the area of the gap between the outer layer outlet end 25 and the inlet guide section 14 is smaller, the cavity volume of the resonant cavity 31 is larger, and the resonant cavity 31 is ensured to be capable of reducing noise emitted by the fan. The area of the gap between the outer layer outlet end 25 and the inlet guide section 14 is small, so that the natural frequency of the resonant cavity 31 can be reduced, the low-frequency noise emitted by the fan can be effectively reduced by the resonant cavity 31, and the effects of improving the sound quality of the fan and reducing the noise of the fan are achieved.
Through the setting of sound absorbing material, can effectively absorb the high frequency noise that the fan operation in-process produced. Therefore, the sound-absorbing material can reduce high-frequency noise while consuming low-frequency noise sound energy through the resonant cavity 31, and can effectively reduce noise emitted in the running process of the fan.
Due to the arrangement of the connecting ring 41, the air guide ring inner layer 11 and the air guide ring outer layer 21 can be connected, and the function of sealing the resonant cavity 31 can also be achieved. The connecting plate 42 and the connecting ring 41 are fixed on the mounting panel 13 through the fixing piece 43, so that the air guide ring inner layer 11 can provide a supporting force for the air guide ring outer layer 21 through the connecting ring 41, and the function of connecting the air guide ring inner layer 11 and the air guide ring outer layer 21 through a connecting structure is realized.
Example 2:
referring to fig. 5, a fan includes a wind wheel 50 and the double-layer noise-reduction wind guide ring 10 in embodiment 1, the wind wheel 50 may adopt an axial flow fan wind wheel 50 or a vortex flow fan wind wheel 50, and in this embodiment, the wind wheel 50 adopts an axial flow fan wind wheel 50.
The embodiment has the following advantages:
example 3:
the double-layer noise-reduction wind guide ring is different from the embodiment 1 in that a connecting ring and an outer layer wind guide ring are arranged eccentrically, and the axis of the connecting ring is parallel to and does not coincide with the axis of the outer layer wind guide ring.
By such an arrangement:
the connecting rings and the outer layer wind guide rings are arranged in a staggered mode, so that the volumes of the resonant cavities are different, the resonant cavities are designed and adjusted conveniently, and the effect of convenience in installation and manufacturing is achieved.
The double-layer noise-reducing air guide ring 10 is arranged in the fan, so that the advantages of high fan efficiency and low air inlet noise are achieved.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a double-deck wind-guiding circle of making an uproar (10) falls, includes wind-guiding circle inlayer (11), its characterized in that: the air guide ring is characterized by further comprising an air guide ring outer layer (21), the air guide ring inner layer (11) comprises a circular ring section (12), an installation panel (13), an inlet flow guide section (14) and an outlet diffusion section (15), the inlet flow guide section (14) and the outlet diffusion section (15) are fixedly connected with two ends of the circular ring section (12) respectively, the inlet flow guide section (14) is arc-shaped, the installation panel (13) is fixedly connected with one side, far away from the circular ring section (12), of the inlet flow guide section (14), the air guide ring outer layer (21) comprises a plane section (22), an arc section (23) and a partition plate (24), an outer layer outlet end (25) is arranged at one end, close to the air guide ring inner layer (11), of the arc section (23) is provided with an outer layer inlet end (26) far away from the air guide ring inner layer (11), a connecting structure is arranged between the installation panel (13) and the plane section (22), the partition plates (24) are arranged in multiple numbers, the partition plates (24) are located between the plane section (22) and the partition plates (23), and a resonant cavity (31) is arranged between the adjacent partition plates (24).
2. The double-layer noise reducing wind deflector (10) according to claim 1, wherein: the volumes of the resonant cavities (31) among the partition plates (24) are different from each other.
3. The double-layer noise reducing wind guide ring (10) according to claim 1, wherein: the axial height of the inner layer (11) of the wind guide ring is H, the axial height of the outer layer (21) of the wind guide ring is H1, and H1 is less than or equal to 0.1H and less than or equal to 0.5H.
4. The double-layer noise reducing wind deflector (10) according to claim 1, wherein: the axial height of the inlet guide section (14) is H2, the axial distance between the circular ring section (12) and the outer layer outlet end (25) is H3, and 0.1H2 is less than or equal to H3 and less than or equal to 1.5H2.
5. The double-layer noise reducing wind deflector (10) according to claim 1, wherein: the diameter of the circular ring section (12) is D, the diameter of the outer layer outlet end (25) is D1, and the diameter of 0.9D is less than or equal to D1.
6. The double-layer noise reducing wind deflector (10) according to claim 1, wherein: the diameter of the outer layer outlet end (25) is D1, the maximum diameter of the inlet diversion section (14) is D2, and D1 is less than or equal to D2.
7. The double-layer noise reducing wind deflector (10) according to claim 1, wherein: the largest diameter of the inlet guide section (14) is D2, and the diameter of the outer layer inlet end (26) is D3, wherein D3 is more than D2.
8. The double-layer noise reducing wind deflector (10) according to claim 1, wherein: the distance between the outer layer outlet end (25) and the inlet guide section (14) is T, the axial height of the outer layer (21) of the air guide ring is H1, and T is more than 0 and less than or equal to 0.3H1.
9. The double-layer noise reducing wind guide ring (10) according to claim 1, wherein: the inner wall of the resonant cavity (31) is provided with sound absorption materials.
10. A fan, its characterized in that: comprising a double-layer noise-reducing wind guide ring (10) according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211666478.9A CN115823021A (en) | 2022-12-23 | 2022-12-23 | Double-layer noise-reduction air guide ring and fan thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211666478.9A CN115823021A (en) | 2022-12-23 | 2022-12-23 | Double-layer noise-reduction air guide ring and fan thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115823021A true CN115823021A (en) | 2023-03-21 |
Family
ID=85518092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211666478.9A Pending CN115823021A (en) | 2022-12-23 | 2022-12-23 | Double-layer noise-reduction air guide ring and fan thereof |
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| Country | Link |
|---|---|
| CN (1) | CN115823021A (en) |
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2022
- 2022-12-23 CN CN202211666478.9A patent/CN115823021A/en active Pending
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