Patent Application
20150219120
1. Field of the Invention
The present invention relates generally to a fan frame body structure, and more particularly to a fan frame body structure, which can reduce the co-vibration of the fan to lower the noise.
2. Description of the Related Art
The materials of the existent fan frames can be generally classified into two types, that is, metal frame body made by means of casting and plastic frame body made by means of injection molding. The cast metal frame body such as aluminum-made frame body has a higher price due to higher material cost. The plastic frame body made by means of injection molding, such as PBT, PA66 and PPE frame body has a much cheaper price than the metal frame body due to lower material cost so that the plastic frame body is popularly used in this field.
The forms of the current fans include one-fan form and series fan form. The fan in the one-fan form has a frame body simply made of plastic material such as PBT, PA66 or PPE. The series fan has two frame bodies serially connected with each other. The frame bodies are made of the same material. For example, both frame bodies are made of PBT, PA66 or PPE.
No matter which form the fan has, the material and composition of the frame bodies are the same. Therefore, in the case that in operation of the fan, the excited frequency of the fan is close to the natural frequency of the fan frame, the fan will severely co-vibrate to make noise. This will ill affect the components of the fan to deteriorate the reading efficiency of hard disc of the system. Moreover, the lifetime of the system and the fan will be shortened.
It is therefore tried by the applicant to provide a fan frame body structure to solve the problem of co-vibration of the fan.
It is therefore a primary object of the present invention to provide a fan frame composed of multiple frame layers, which are stacked to form the fan frame. The respective frame layers are made of different materials with different vibration frequencies. The multiple frame layers of different materials with different vibration frequencies are stacked to form the fan frame so as to reduce the co-vibration of the fan frame and overcome the problem of vibration of the fan.
To achieve the above and other objects, the fan frame body structure of the present invention includes a fan frame. The fan frame has an air inlet and an air outlet respectively positioned on two sides of the fan frame. The fan frame body structure is characterized in that the fan frame is composed of multiple frame layers, which are stacked or formed by injection molding to form the fan frame. The respective frame layers are made of different materials of different compositions with different vibration frequencies. The multiple frame layers of different materials with different vibration frequencies are stacked to form the fan frame so as to effectively reduce the co-vibration of the fan frame and lower the noise. The frame layers are made of different plastic materials selected from a group consisting of PBT, PA66, PPE, PA, PC, ABS and PPS.
Alternatively, fan frame body structure of the present invention includes a fan frame. The fan frame has an air inlet and an air outlet respectively positioned on two sides of the fan frame. The fan frame body structure is characterized in that the fan frame includes: a first frame layer vibrating at a first vibration frequency; and a second frame layer directly overlaid or formed on the first frame layer in an axial direction of the fan frame. The second frame layer vibrates at a second vibration frequency. The first frame layer is made of a material different from that of the second frame layer so that the first vibration frequency of the first frame layer is different from the second vibration frequency of the second frame layer. The first frame layer is made of a plastic material selected from a group consisting of PBT, PA66, PPE, PA, PC, ABS and PPS, while the second frame layer is made of another plastic material selected from a group consisting of PBT, PA66, PPE, PA, PC, ABS and PPS. The first frame layer is adjacent to the air outlet, while the second frame layer is adjacent to the air inlet.
Still alternatively, the fan frame body structure of the present invention includes a fan frame. The fan frame has an air inlet and an air outlet respectively positioned on two sides of the fan frame. The fan frame body structure is characterized in that the fan frame includes: a first frame layer vibrating at a first vibration frequency; a second frame layer directly overlaid or formed on the first frame layer in an axial direction of the fan frame, the second frame layer vibrating at a second vibration frequency; and a third frame layer directly overlaid or formed on the second frame layer in the axial direction of the fan frame. The third frame layer vibrates at a third vibration frequency. The second frame layer is positioned between the first and third frame layers. The first frame layer is made of a material different from that of the second frame layer so that the first vibration frequency of the first frame layer is different from the second vibration frequency of the second frame layer. The third frame layer is made of a material different from that of the second frame layer so that the third vibration frequency of the third frame layer is different from the second vibration frequency of the second frame layer. The material of the third frame layer is identical to or different from the material of the first frame layer so that the third vibration frequency of the third frame layer is equal to or different from the first vibration frequency of the first frame layer. The first frame layer is made of a plastic material selected from a group consisting of PBT, PA66, PPE, PA, PC, ABS and PPS, while the second and third frame layers are made of another plastic material selected from a group consisting of PBT, PA66, PPE, PA, PC, ABS and PPS. The first frame layer is adjacent to the air outlet, while the third frame layer is adjacent to the air inlet.
According to the above arrangement, the present invention can truly reduce the co-vibration of the fan to lower the noise.
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 embodiments of the present invention will be described hereinafter with reference to the drawings, wherein the same components are denoted with the same reference numerals.
Please refer to
The fan frame 10 is composed of multiple frame layers, which are stacked and connected with each other to form the fan frame 10. The respective frame layers are made of different materials of different compositions, which materials have different vibration frequencies. The frame layers are made of plastic materials selected from a group consisting of PBT, PA66, PPE, PA, PC, ABS and PPS. The plastic material of one frame layer is first injected into a mold to form the frame layer by means of injection molding. Then the plastic material of another frame layer is injected into the mold to form the other frame layer. Accordingly, the frame layers are stacked and integrally connected with each other. Alternatively, the frame layers are assembled and connected with each other to form the fan frame 10 by means of engagement structures or rivets.
As shown in the drawings, the fan frame 10 includes a first frame layer 14 and a second frame layer 15. The second frame layer 15 is directly overlaid on the first frame layer 14 in an axial direction of the fan frame 10, that is, the first and second frame layers 14, 15 are vertically stacked. The first frame layer 14 is adjacent to the air outlet 102, while the second frame layer 15 is adjacent to the air inlet 101. It should be especially noted that the first frame layer 14 is made of a material selected from a group consisting of PBT (Polybutylene Terephthalate), PA66 (Polyamide 66 Resin), PPE, PA (Polyamide), PC (Polycarbonate), ABS (Acrylonitrile-Butadene-Styrene) and PPS (Polyphenylene Sulfide Ether). The second frame layer 15 is made of another material selected from a group consisting of PBT, PA66, PPE, PA, PC, ABS and PPS. In order to specifically distinguish the different materials from each other, the different materials are shown by different sectional lines in the drawings. In this embodiment, the first frame layer 14 is made of PA66, while the second frame layer 15 is made of PBT. As shown in
Further referring to
Please now refer to
It should be especially noted that the first, second and third frame layers 24, 25, 26 are made of plastic materials selected from a group consisting of PBT, PA66, PPE, PA, PC, ABS and PPS. The material of the first frame layer 24 is different from the material of the second frame layer 25 so that the first vibration frequency of the first frame layer 24 is different from the second vibration frequency of the second frame layer 25. The material of the third frame layer 26 is different from the material of the second frame layer 25 so that the third vibration frequency of the third frame layer 26 is different from the second vibration frequency of the second frame layer 25. The material of the third frame layer 26 is identical to or different from the material of the third frame layer 24 so that the third vibration frequency of the third frame layer 26 is equal to or different from the first vibration frequency of the first frame layer 24.
In a preferred embodiment, the first frame layer 24 is made of PA66, the second frame layer 25 is made of PBT, while the third frame layer 26 is made of PPE. In another embodiment, the first frame layer 24 is made of PA66, the second frame layer 25 is made of PBT, while the third frame layer 26 is made of PA66. In both embodiments, the fan frame 20 of the present invention is composed of multiple frame layers made of different plastic materials with different vibration frequencies. Therefore, in operation of the fan impeller 11, the co-vibration of the fan frame 20 is greatly reduced to lower the noise. Alternatively, the first and second frame layers 24, 25 can be made of PA66, while the third frame layer 26 can be made of PBT as two different frame layers. Still alternatively, the first frame layer 24 can be made of PA66, while the second and third frame layers 25, 26 can be made of PBT as two different frame layers.
In conclusion, the fan frame body structure of the present invention is composed of multiple frame layers, which are stacked and connected with each other. The respective frame layers are made of different plastic materials of different compositions, which materials have different vibration frequencies. Therefore, the excited frequency of the fan is not close to the natural frequency of the fan frame, whereby the co-vibration of the fan is reduced to lower the noise.
The present invention has been described with the above embodiments thereof and it is understood that many changes and modifications in the above 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.
