The present invention relates to a fan structure with non-circular circumference, and more particularly, to a fan structure with non-circular circumference that can operate with largely reduced vibration and noise and can be manufactured at reduced material and production costs.
With the constant progress of scientific technology, people's reliance on various kinds of electronic apparatuses also increases. Electronic products, such as computers and notebook computers, have internal elements that tend to produce a high amount of heat during operation thereof. The produced heat must be timely removed from the electronic products to avoid the problem of overheating. Therefore, most electronic products are internally equipped with a fan, so that the electronic products in operation can always maintain at a temperature within the working temperature range set for them.
Accordingly, the conventional parallel fan structure has the following disadvantages: (1) the fans thereof produce increased vibration when they operate; and (2) it produces serious noise due to dipole-dipole interaction.
It is therefore tried by the inventor of the present invention to develop an improved fan structure that can eliminate the problems in the conventional parallel fan structure.
A primary object of the present invention is to effectively solve the aforesaid problems by providing a fan structure with non-circular circumference that can operate with largely reduced vibration.
Another object of the present invention is to provide a fan structure with non-circular circumference that can suppress noise produced due to dipole-dipole interaction.
A further object of the present invention is to provide a fan structure with non-circular circumference that can be manufactured at largely reduced material and production costs.
To achieve the above and other objects, the fan structure with non-circular circumference provided according to an embodiment of the present invention includes a frame, a first hub, a second hub, a transmission belt member, a first assembling member and a second assembling member. The frame internally defines a receiving space and has a first and a second base protruded from a bottom of the frame. The first hub is correspondingly mounted on the first base and includes a first top and a first side wall, and the first top is formed with a first engaging section. And, a stator unit is provided between the first hub and the first base. The second hub is correspondingly mounted on the second base and includes a second top and a second side wall, and the second top is formed with a second engaging section. The transmission belt member is fitted around the first and the second side wall and has a plurality of blades spaced on a surface portion thereof. The first and the second assembling member are correspondingly assembled to the first and the second top, respectively.
When the fan structure of the present invention operates, the first hub is first driven to rotate. The rotation of the first hub will bring the transmission belt member to rotate counterclockwise or clockwise. Meanwhile, the second hub is also brought by the transmission belt member to rotate along with the first hub. At this point, due to a pressure difference between upper and lower surfaces of the blades on the transmission belt member, air at an air inlet of the frame is sucked into the receiving space in the frame and then flows out of the frame via an air outlet. By causing the transmission belt member to rotate continuously along a noncircular circumferential path to enable the operation of the fan structure, it is able to overcome the problem of serious resonance between fan frames of the conventional parallel fan structure caused by the mutually influenced vibration base-frequency of the parallelly connected fans. Moreover, since the transmission belt member of the fan structure according to the present invention operates along a non-circular circumferential path, it is able to suppress dipole noise generation and accordingly minimize the noise produced due to dipole-dipole interaction. In addition, with the present invention, it is able to save the costs for some parts, such as one stator unit and one magnetic element, which are considered necessary in the conventional parallel fan structure.
Therefore, the fan structure of the present invention can be manufactured at largely reduced material and production costs.
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. For the purpose of easy to understand, elements that are the same in the preferred embodiments are denoted by the same reference numerals.
Please refer to
The first hub 22 has a first shaft 223 being correspondingly inserted in the first shaft hole 2122 of the first base member 212. The first hub 22 also has a first top 221 and a first side wall 222, which together define a receiving chamber 224 in the first hub 22. The first top 221 is formed with a first engaging section opening 2211, and the receiving chamber 224 is communicable with the receiving space 211. A stator unit 25 is received in the receiving chamber 224 and fitted on the first base member 212. A magnetic element 28 is circumferentially provided on an inner surface of the first side wall 222 of the first hub 22 to be located corresponding to the stator unit 25. The magnetic element 28 and the stator unit 25 cooperate to enable excitation thereof.
The second hub 23 has a second shaft 233 being correspondingly inserted in the second shaft hole 2132 of the second base member 213. The second hub 23 also has a second top 231 and a second side wall 232. The second top 231 is formed with a second engaging section opening 2311.
The transmission belt member 24 is fitted around the first and the second side wall 222, 232 and has a belt surface portion 241 and an edge portion 242. The belt surface portion 241 includes an outer surface 241a and an inner surface 241b. On the outer surface 241a, there are provided a plurality of spaced blades 243. The inner surface 241b is in contact with the first and the second side wall 222, 232. Depending on user requirements, the blades 243 can be odd or even in number to similarly achieve the intended effects of the present invention. In the first embodiment, the blades 243 are integrally formed with the transmission belt member 24. The blades 243 can be made of any environment-friendly and nontoxic material with some desirable physical properties, such as good toughness, anti-slip ability and thermal stability. An example of this kind of material is silicone.
The first washer-shaped assembling member 26 has a first assembling section 261, which is correspondingly engaged with the first engaging section opening 2211 on the first top 221 of the first hub 22. The washer-shaped second assembling member 27 has a second assembling section 271, which is correspondingly engaged with the second engaging section opening 2311 on the second top 231 of the second huh 23. The first and the second washer-shaped assembling members 26, 27 are pressed against the edge portion 242 of the transmission belt member 24, lest the latter should become loosened or separated from the first and the second hub 22, 23 when the fan structure 2 operates.
When the fan structure 2 with the above-described arrangements starts operating, the stator unit 25 and the magnetic element 28 are excited to drive the first hub 22 to rotate. The rotation of the first hub 22 will bring the transmission belt member 24 to rotate counterclockwise or clockwise. Meanwhile, the second hub 23 is also brought by the transmission belt member 24 to rotate along with the first hub 22. At this point, due to a pressure difference between upper and lower surfaces of the blades 243 on the transmission belt member 24, air at the air inlet 214 of the frame 21 is sucked into the receiving space 211 in the frame 21 and then flows out of the frame 21 via the air outlet 215. By causing the transmission belt member 24 to rotate continuously along a noncircular circumferential path to enable the operation of the fan structure 2, it is able to overcome the problem of serious resonance between fan frames of the conventional parallel fan structure caused by the mutually influenced vibration base-frequency of the parallelly connected fans. Moreover, with the present invention, the first and the second hub 22, 23 are mounted in one single frame 21, and the stator unit 25 is provided only in the receiving chamber 224 of the first hub 22 while the first and second hubs 22, 23 are brought to rotate at the same time. Therefore, the fan structure 2 can operate with largely reduced vibration to suppress dipole noise generation and accordingly minimize the noise produced due to dipole-dipole interaction. In addition, with the present invention, it is able to save the costs for some parts, such as one stator unit and one magnetic element, which are considered necessary in the conventional parallel fan structures. Therefore, the fan structure 2 of the present invention can be manufactured at largely reduced material and production costs.
Please refer to
In summary, compared to the conventional parallel fan structures, the fan structure of the present invention has the following advantages: (1) it can operate with largely reduced vibration; (2) it largely suppresses the noise produced due to dipole-dipole interaction; and (3) it can be manufactured at largely reduced material and production costs.
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.
Number | Name | Date | Kind |
---|---|---|---|
979320 | McKague et al. | Dec 1910 | A |
2415592 | Hoenecke | Feb 1947 | A |
2548615 | Petr, Jr. | Apr 1951 | A |
2553001 | Petr, Jr. | May 1951 | A |
3270805 | Glucksman | Sep 1966 | A |
3992125 | Schilling | Nov 1976 | A |
4049300 | Schneider | Sep 1977 | A |
4186314 | Diggs | Jan 1980 | A |
6435827 | Steiner | Aug 2002 | B1 |
7744340 | Levin | Jun 2010 | B2 |
20150275906 | Yeh | Oct 2015 | A1 |
Number | Date | Country |
---|---|---|
202833236 | Mar 2013 | CN |
105443431 | Mar 2016 | CN |
105485052 | Apr 2016 | CN |
08-019920 | Jan 1996 | JP |
2006077612 | Mar 2006 | JP |
Number | Date | Country | |
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20180156231 A1 | Jun 2018 | US |