Patent Application
20210003135
The present invention relates generally to a fan backflow prevention structure, and more particularly to a fan backflow prevention structure, which is able to prevent the air from flowing back to the air inlet and greatly enhance the heat dissipation efficiency.
In order to meet the requirement of uninterruption power of a server, the server is equipped with multiple fans to dissipate the heat. When any of the fans of the server fails, the rests of the fans can still normally operate to provide heat dissipation function. However, the failing fan will stop rotating and cannot create push force. Under such circumstance, the pressure at the air outlet is greater than the pressure of the air inlet so that the air at the air outlet will flow through the failing fan back to the air inlet. This will indirectly affect the heat dissipation performance of the other fans in normal operation.
Please refer to
In normal operation, the movable members 121 of the backflow prevention device 12 of the fan 1 are opened to contain an approximately 90-degree angle with the plane defined by the fixed frame 120 as shown in
Such backflow prevention device 12 can achieve the object of backflow prevention. However, the arrangement of the backflow prevention device 12 will reduce the air outgoing area. In addition, the backflow prevention device 12 will lead to increase of the total thickness of the fan 1 to occupy more room. Moreover, the conventional backflow prevention device 12 is an external device additionally mounted on the fan 1 to avoid air backflow. This will greatly increase the manufacturing cost of the fan 1 and prolong the working time. In addition, in normal operation of the fan 1, the movable members 121 are arranged in parallel to each other to affect the preset wind direction and pressure of the fan 1 and deteriorate the performance of the fan 1.
According to the above, the conventional backflow prevention device has the following shortcomings:
1. The air will flow back to the air inlet.
2. The heat dissipation efficiency is deteriorated.
3. The manufacturing cost is increased and the working time is prolonged.
It is therefore tried by the applicant to provide a fan backflow prevention structure to solve the above problems existing in the conventional fan backflow prevention structure.
It is therefore a primary object of the present invention to provide a fan backflow prevention structure, which is able to prevent the air from flowing back to the air inlet.
It is a further object of the present invention to provide the above fan backflow prevention structure, which can greatly enhance the heat dissipation efficiency of the fan.
It is still a further object of the present invention to provide the above fan backflow prevention structure, which can greatly lower the manufacturing cost and shorten the working time.
To achieve the above and other objects, the fan backflow prevention structure of the present invention includes a frame body, a first static blade and a second static blade. The frame body has a peripheral wall. Two ends of the peripheral wall are respectively formed with an air inlet and an air outlet. A base seat is correspondingly disposed at the air outlet. The first static blade outward extends from the base seat and includes multiple static blade sections. Two ends of each static blade section are respectively connected with the base seat and the peripheral wall. The second static blade is disposed at the air outlet and rotatably assembled with the base seat. The second static blade has an assembling section and multiple stop sections outward extending from the assembling section.
According to the structural design of the present invention, when the fan of a server normally operates, the second static blade will overlap the first static blade on the fan frame body. When one of the fans of the server fails, (for example, the fan malfunctions or stops operating in a stationary state), the second static blade assembled on the fan frame body will rotate by an angle to misalign from the first static blade. Under such circumstance, the stop sections are correspondingly positioned in the flow ways formed between the static blade sections so as to avoid backflow of the air at the air outlet. Accordingly, the stop sections serve as stop components capable of preventing the air from flowing back to the air inlet. Therefore, it is unnecessary to provide additional backflow prevention device so that the manufacturing cost is greatly lowered and the working time is greatly shortened and the heat dissipation efficiency can be enhanced.
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:
Please refer to
The first static blade 21 radially extends from the base seat 205. The first static blade 21 includes multiple static blade sections 210. Two ends of each static blade section 210 are respectively connected with the outer circumference of the base seat 205 and the inner wall 200 of the frame body 2. Each two static blade sections 210 define therebetween a flow way 23 in communication with the air outlet 203. In this embodiment, the first static blade 21, the frame body 2 and the base seat 205 are formed as an integrated structure. In practice, according to the requirement of a user, the components can be first respectively formed and then assembled with each other. This will not affect the effect achieved by the present invention.
The second static blade 22 is disposed at the air outlet 203 and rotatably assembled with the base seat 205. To speak more specifically, the base seat 205 is further formed with a hub section 206 protruding from the outer circumference of the bottom section of the base seat 205. The second static blade 22 has an assembling section 220 correspondingly disposed on the hub section 206. Multiple stop sections 221 outward extend from the assembling section 220. In this embodiment, the assembling section 220 and the stop sections 221 are formed as an integrated structure. The stop sections 221 outward radially extend from the assembling section 220 and are arranged at intervals.
Each stop section 221 has a first end 221a and a second end 221b. The first end 221a is correspondingly connected with the assembling section 220. The second end 221b abuts against the inner wall 200 of the frame body 2. It should be noted that the stop sections 221 of the second static blade 22 are arranged by an angle identical to that of the static blade sections 210 of the first static blade 21. Therefore, when the assembling section 220 of the second static blade 22 is mounted on the hub section 206 of the base seat 205, the stop sections 221 of the second static blade 22 are overlapped with the static blade sections 210 of the first static blade 21.
In addition, it should be noted that the structures of the static blade sections 210 of the first static blade 21 and the stop sections 221 of the second static blade 22 are, but not limited to, in the form of the static blades of a common fan in the market. Alternatively, the structures of the static blade sections 210 and the stop sections 221 can have form of ribs instead of the static blades.
The second end 221b of the stop section 221 further has an abutment section 222 outward protruding from the second end 221b. The abutment section 222 correspondingly abuts against the inner wall 200 of the peripheral wall 20 of the frame body 2. The abutment section 222 serves to prevent the second static blade 22 from continuously rotating around the hub section 206 of the base seat 205.
Please now refer to
In conclusion, in comparison with the conventional backflow prevention device, the present invention has the following advantages:
The present invention has been described with the above embodiments thereof and it is understood that many changes and modifications in such as the form or layout pattern or practicing step of 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.
