The present invention relates to a fan noise-lowering structure, and more particularly, to a fan noise-lowering structure capable of guiding air at an air outlet of the fan having higher pressure to generate swirls, which move toward an air inlet of the fan to thereby lower fan noise.
Fan noise is one of many problems in the fan industrial field that always needs to be improved. Conventional technical means of solving the fan noise problem include the use of a circuit to control fan rotational speed, the change of fan structure, etc. A prior art discloses the inclusion of a pre-swirl generator and/or a fluid seal generator in a fan to generate a layer of swirls and/or a fluid barrier between rotor blades or stator blades and an interior surface of a fluid flow passage in the fan, so as to inhibit the formation of blade vortices therebetween. To achieve the above described effect, an externally connected source for forming the fluid swirls or seals is required for the fan. However, it is impossible to do so when the fan is disposed in a limited space. Further, the provision of the externally connected source for forming the fluid swirls or seals tends to increase the cost of the fan.
It is therefore tried by the inventor to develop a fan noise-lowering structure without increasing any additional part to the fan.
To overcome the drawbacks in the prior art fan noise reducing structure, a primary object of the present invention is to provide a fan noise-lowering structure, which itself provides an auto swirls generating structure to reduce the fan noise.
To achieve the above and other objects, the fan noise-lowering structure according to an embodiment of the present invention includes a fan frame main body and a connecting pipe.
The fan frame main body has a bottom section and a peripheral wall section; the peripheral wall section is externally located around and forwardly extended normal to the bottom section and internally defines an air-stream passage. Further, the peripheral wall section is formed with a first pipe and a second pipe, which are communicable with the air-stream passage defined in the peripheral wall section. The connecting pipe has two ends respectively connected to the first pipe and the second pipe.
To achieve the above and other objects, the fan noise-lowering structure according to another embodiment of the present invention includes a first fan frame main body, a second fan frame main body, and a connecting pipe.
The first fan frame main body has a first bottom section and a first peripheral wall section. The first peripheral wall section is externally located around and forwardly extended normal to the first bottom section, and internally defines a first air-stream passage, which has a first air inlet and a first air outlet forming two ends of the first air-stream passage. The first peripheral wall section is formed with a first pipe, which is communicable with the first air-stream passage defined in the first peripheral wall section. The second fan frame main body has a second bottom section and a second peripheral wall section. The second peripheral wall section is externally located around and forwardly extended normal to the second bottom section, and internally defines a second air-stream passage, which has a second air inlet and a second air outlet forming two ends of the second air-stream passage. The first and the second fan frame main body can be connected to each other in series or in parallel. The second peripheral wall section is formed with a second pipe, which is communicable with the second air-stream passage defined in the second peripheral wall section. The first pipe and the second pipe are respectively connected to one of two ends of the connecting pipe.
To achieve the above and other objects, the fan noise-lowering structure according to a further embodiment of the present invention includes a fan frame main body, a first connecting pipe, and a second connecting pipe.
The fan frame main body has a bottom section and a peripheral wall section. The peripheral wall section is externally located around and forwardly extended normal to the bottom section. Further, the peripheral wall section internally defines an air-stream passage and is formed with a first pipe, a second pipe, a third pipe, and a fourth pipe, which are communicable with the air-stream passage. The first connecting pipe is connected at two ends to any two of the first, the second, the third and the fourth pipe; and the second connecting pipe is connected at two ends to the other two of the first, the second, the third and the fourth pipe that are not connected to the first connecting pipe.
With the above arrangement, the fan noise-lowering structure according to the present invention itself provides an auto swirls generating structure capable of guiding air-stream near the fan air outlet and having higher pressure to generate swirls moving toward the fan air inlet and accordingly, automatically lowers the noise produced by the fan when it operates.
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
The present invention will now be described with some preferred embodiments thereof and by referring to the accompanying drawings.
Please refer to
The fan frame main body 11 has a bottom section 111 and a peripheral wall section 112. The peripheral wall section 112 is externally located around and forwardly extended normal to the bottom section 111. Further, the peripheral wall section 112 internally defines an air-stream passage 113 and is formed with a first pipe 114 and a second pipe 115, which are communicable with the air-stream passage 113 and are respectively connected to one of two ends of the connecting pipe 12. The bottom section 111 is formed with a vertically forwardly extended bearing cup 116.
The fan frame main body 11 has an air inlet 11a and an air outlet 11b. In the illustrated
Please refer to
The first fan frame main body 3 has a first bottom section 31 and a first peripheral wall section 32. The first peripheral wall section 32 is externally located around and forwardly extended normal to the first bottom section 31. Further, the first peripheral wall section 32 internally defines a first air-stream passage 33, which has a first air inlet 331 and a first air outlet 332 forming two ends of the first air-stream passage 33. The first peripheral wall section 32 is formed with a first pipe 321, which is communicable with the first air-stream passage 33 defined in the first peripheral wall section 32.
The second fan frame main body 4 has a second bottom section 41 and a second peripheral wall section 42. The second peripheral wall section 42 is externally located around and forwardly extended normal to the second bottom section 41. Further, the second peripheral wall section 42 internally defines a second air-stream passage 43, which has a second air inlet 431 and a second air outlet 432 forming two ends of the second air-stream passage 43. The first and the second fan frame main body 3, 4 can be connected to each other in series or in parallel. The second peripheral wall section 42 is formed with a second pipe 421, which is communicable with the second air-stream passage 43 defined in the second peripheral wall section 42. The first pipe 321 and the second pipe 421 are respectively connected to one of two ends of the first connecting pipe 5.
In the second embodiment, the first bottom section 31 is formed with a vertically forwardly extended first bearing cup 311, and the second bottom section 41 is formed with a vertically forwardly extended second bearing cup 411.
The first pipe 321 on the first peripheral wall section 32 has a first outlet end 321a communicable with the first air-stream passage 33 and is located closer to the first air inlet 331 of the first fan frame main body 3; on the other hand, the second pipe 421 on the second peripheral wall section 42 has a first inlet end 421a communicable with the second air-stream passage 43 and is located closer to the second air outlet 432 of the second fan frame main body 4.
The first air outlet 332 is located at one end of the first air-stream passage 33 having the first bottom section 31 disposed thereat, and the first air inlet 331 is located at the other end of the first air-stream passage 33 opposite to the first air outlet 332. The first outlet end 321a of the first pipe 321 on the first peripheral wall section 32 is located closer to the first air inlet 331 of the first air-stream passage 33. The first inlet end 421a of the second pipe 421 on the second peripheral wall section 42 is located closer to the second air outlet 432 of the second air-stream passage 43, and the second air inlet 431 is located at the other end of the second air-stream passage 43 opposite to the second air outlet 432.
In the second embodiment illustrated in
The first peripheral wall section 32 is further formed with a third pipe 322 and a fourth pipe 323, and the second peripheral wall section 42 is further formed with a fifth pipe 422 and a sixth pipe 423. The third pipe 322 is located on the first peripheral wall section 32 closer to the first air inlet 331 and communicable with the first air-stream passage 33 defined in the first peripheral wall section 32. The fourth pipe 323 is located on the first peripheral wall section 32 closer to the first air outlet 332 and communicable with the first air-stream passage 33 defined in the first peripheral wall section 32. The fifth pipe 422 is located on the second peripheral wall section 42 closer to the second air inlet 431 and communicable with the second air-stream passage 43 defined in the second peripheral wall section 43.
The sixth pipe 423 is located on second peripheral wall section 42 closer to the second air outlet 432 and communicable with the second air-stream passage 43 defined in the second peripheral wall section 42.
In the second embodiment, the fan noise-lowering structure further includes a second connecting pipe 6 having two ends that are respectively connected to one of the third and the fifth pipe 322, 422; and a third connecting pipe 6a having two ends that are respectively connected to one of the fourth and the sixth pipe 323, 423.
Please refer to
In the third embodiment, the first fan frame main body 3 is formed with a first pipe 321 and a third pipe 322; the second fan frame main body 4 is formed with a second pipe 421 and a fifth pipe 422. The first pipe 321 is communicably connected to the second pipe 421 via a first connecting pipe 5, and the third pipe is communicably connected to the fifth pipe 422 via a second connecting pipe 6.
Please refer to
The fan frame main body 7 has a bottom section 71 and a peripheral wall section 72. The peripheral wall section 72 is externally located around and forwardly extended normal to the bottom section 71. Further, the peripheral wall section 72 internally defines an air-stream passage 73 and is formed with a first pipe 721, a second pipe 722, a third pipe 723 and a fourth pipe 724, which are communicable with the air-stream passage 73. The first connecting pipe 8 is connected at two ends to any two of the first, the second, the third and the fourth pipe 721, 722, 723, 724; and the second connecting pipe 9 is connected at two ends to the other two of the first, the second, the third and the fourth pipe 721, 722, 723, 724 that are not connected to the first connecting pipe 8. In
The bottom section 71 is formed with a vertically forwardly extended bearing cup 74. Further, in the fourth embodiment of the present invention shown in
With the above arrangement, the fan noise-lowering structure according to the present invention itself provides an auto swirls generating structure capable of guiding air-stream near the fan air outlet and having higher pressure to generate swirls moving toward the fan air inlet and accordingly, automatically lowers the noise produced by the fan when it operates.
In other words, with the structure of the present invention, the fan noise can be reduced when the air-stream near the fan air outlet and having higher pressure generates swirls that move toward the fan air inlet having lower pressure.
Further, while the connecting pipes in the illustrated embodiments of the present invention are arranged outside the fan peripheral wall section, they can be otherwise formed in the fan peripheral wall section in other embodiments.
The present invention has been described with some preferred embodiments thereof and it is understood that many changes and modifications in the described embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.
The present application is a continuation in part of U.S. patent application Ser. No. 15/979,485, filed on Aug. 15, 2018.
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Number | Date | Country | |
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20200332810 A1 | Oct 2020 | US |
Number | Date | Country | |
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Parent | 15979485 | May 2018 | US |
Child | 16920431 | US |