TWM512155U - Centrifugal fan structure - Google Patents

Description

Centrifugal fan structure

A centrifugal fan structure, especially a centrifugal fan structure combining the characteristics of radial and forward-inclined vanes.

With the advancement and development of technology, the design of various chips and microprocessors in computers has become more sophisticated and fast, and in order to meet the needs of users to carry easily, various portable 3C products have gradually developed toward light and thin directions. However, as the computing speed of the computer has greatly leapt forward, the relative temperature generated by it has also increased significantly. In theory, it is necessary to provide more heat dissipation space to meet the needs of its rapid heat dissipation. On the other hand, in view of consumers' requirements for lightness, thinness and portability, they are contrary to the aforementioned requirements for improving heat dissipation. Therefore, in order to cope with the high temperature generated by the high-speed operation of the wafer and to meet the consumer's requirements for light, thin and easy to carry portable 3C products, manufacturers only focus on the development of various heat sinks, by improving the heat sink. Cooling efficiency to achieve two important requirements of both work efficiency and easy to carry.

In the case of a notebook computer in the 3C product, although there are many types of fans, it is only a centrifugal fan that can provide a certain amount of air volume in a limited thickness space. The conventional centrifugal fan is mainly composed of a volute casing body, a motor and a fan. The main system of the snail casing is provided with an air outlet and an air inlet, and the motor and the fan are fixed in the main body of the volute casing. It can be fixed to the shaft of the motor and driven by the motor to rotate the fan to generate wind pressure to be sent out by the air outlet. The fan A is further composed of the impeller B and a plurality of blades C disposed thereon, and the blade C itself has a variety of designs, because the shape of the blade C itself is also centrifugal The fan's own air volume and noise level have an impact, which will also affect the heat dissipation efficiency of the overall centrifugal fan. Therefore, the design of the fan blade C itself has been developed for a long time. The point is where. The fan blades of the conventional fan have a common blade C-leaf type (shown in FIG. 1) and a straight leaf (as shown in FIG. 2), and the two have advantages and disadvantages due to differences in the shape of the blade. Among them, the vane has the advantages of light weight and the number of blades can be designed, but the design parameters are easily limited by the noise of the restricted level. On the contrary, although the straight leaf has the advantages of strong structure and large air volume, it is easy to affect the motor performance due to heavy mass, which in turn makes the motor temperature rise too high and further affects the performance of the fan.

Therefore, in order to improve the above-mentioned shortcomings, the creator has finally tried and improved, and finally proposed an ingenious design, and can effectively improve the above-mentioned missing centrifugal fan structure.

The main purpose of the present invention is to provide a centrifugal fan structure, which mainly utilizes a radial design of a blade on an impeller in a fan and a forward bend of a large angle at an outer end of the blade. With this design, the creation has the advantage of light and large flow.

The secondary objective of the present invention is to provide a centrifugal fan structure, which utilizes a fan-shaped blade on the impeller in the fan to form a radial design with a large angle of the forward bend of the outer end of the blade. This design makes the design of its parameters more diversified and can effectively reduce the motor load and thus improve the efficiency of the fan.

In order to achieve the foregoing objectives, the centrifugal fan structure of the present invention is mainly composed of a casing body, a motor and a fan, wherein the casing body is provided with an air outlet and an air inlet, and the motor and the fan are fixed in the volute casing body. The fan can be fixed to the shaft of the motor and driven by the motor to rotate the fan to generate wind pressure to be sent out by the air outlet. The fan is further composed of an impeller and a plurality of blades disposed thereon, wherein the fan blade on the impeller has a radial design and the outer end of the blade has a larger angle. Bend forward.

A‧‧‧fan

B‧‧‧ impeller

C‧‧‧ fan leaves

1‧‧‧ Shell body

11‧‧‧air outlet

12‧‧‧Air inlet

13‧‧‧Upper casing

14‧‧‧ Lower case

141‧‧‧ fixed seat

2‧‧‧Motor

21‧‧‧Axis

3‧‧‧Fan

31‧‧‧ Impeller

32‧‧‧ fan leaves

321‧‧‧Bend

33‧‧‧ ribs

X‧‧‧ fan blade exit angle

Figure 1 is a schematic plan view of a conventional wheel.

Figure 2 is a schematic plan view of a conventional wheel.

Figure 3 is a schematic diagram of the three-dimensional appearance of the creation.

Figure 4 is a schematic diagram of the three-dimensional appearance of the creation.

Figure 5 is a schematic view of the plane appearance of the impeller in this creation.

First, please refer to FIG. 3 and FIG. 4, which are schematic diagrams of the three-dimensional appearance of the creation of the centrifugal fan structure and a three-dimensional combination diagram. The centrifugal fan structure of the present invention is mainly composed of a casing body 1, a motor 2 and a fan 3. The casing body 1 is provided with an air outlet 11 and an air inlet 12, and the motor 2 and the fan 3 are fixed to the casing body 1. The fan 3 can be fixed to the shaft 21 of the motor 2, and the fan 3 is rotated by the motor 2 to generate wind pressure to be sent out by the air outlet. The fan 3 is further composed of an impeller 31 and a plurality of blades 32 disposed thereon, wherein the fan 32 of the fan 3 is formed in a radial design and outside of the blade 32. The tail end has a large angle of the forward bend portion 321 .

In the structure described in the preceding paragraph, each of the blades 32 on the impeller 31 is slightly curved in the direction of the rotation of the impeller 31 by the impeller 31 in the direction of the circumferential tangential line near the outer edge of the rim, wherein the blade exit angle x is the angle between the tangential velocity of the air leaving the end of the blade 32 and the circumferential tangential velocity of the impeller 31, which is approximately 90 degrees.

With the structure described in the preceding paragraph, the design of the blade 32 on the impeller 31 is based on the parameter characteristics of the radial and forward-inclined blades, respectively, and can be combined with the light weight of the vane and the flow of the straight leaf. The characteristics can further diversify the design parameters of the entire blade, and can effectively reduce the load of the motor 2 itself and thereby improve the efficiency of the overall centrifugal fan.

In the structure described in the preceding paragraph, at least one rib 33 extending outwardly and fixedly fixing the respective blades 32 is provided on the outer edge of the rim of the impeller 31. By the arrangement of the ribs 33, each of the blades 32 can be effectively Stable support and fixing, so that it has excellent overall structural strength.

Further, in the foregoing structure, the outer casing main body 1 is formed in a volute shape, and the outer casing main body 1 is further composed of an upper casing 13 and a lower casing 14, wherein the air inlet 12 is provided with an upper casing 13 or a lower casing. The body 14 has a top end or a bottom end of at least one of the two, and the air outlet 11 is disposed on one side of the entire outer casing main body 1.

Further, in the foregoing structure, the inner surface of the lower casing 14 is provided with a fixing base 141 for accommodating the fixed motor 2, so that the motor 2 incorporating the impeller 31 can be directly placed on the fixed seat. Within 141, the effect of stable fixation is achieved.

The embodiments described above are not intended to limit the scope of application of the present invention. The scope of protection of the present invention should be based on the technical spirit defined by the content of the patent application scope of the present invention and the scope thereof. That is to say, the equivalent changes and modifications made by the applicants in accordance with the scope of the patent application for this creation, for example, the change in the angle of the forward bending portion of the outer end of the fan blade with a large angle is not changed. The essence of the creation and the scope and scope of this creation should be regarded as the further implementation of this creation.

In summary, the centrifugal fan structure of the present invention utilizes the design of the radial blade and has a large angle of the forward bend at the outer end of the blade, which not only makes it light in weight, but also produces air volume. Large features, and can effectively reduce the load of the motor and thus improve the overall fan performance. There is no doubt about its practicality, and it has not been seen in any publications or public occasions before the application for this creation. Its novelty and progress have no doubts, and it has already met the requirements stipulated in the new patent law.

3‧‧‧Fan

31‧‧‧ Impeller

32‧‧‧ fan leaves

321‧‧‧Bend

33‧‧‧ ribs

X‧‧‧ fan blade exit angle

Claims (7)

A centrifugal fan structure is mainly composed of a casing body, a motor and a fan, wherein the casing body is provided with an air outlet and an air inlet, and the motor and the fan are fixed in the casing body, and the fan can be fixed to the motor. The fan is rotated by the motor to generate wind pressure generated by the air outlet, and the fan is further composed of the impeller and a plurality of blades disposed thereon, wherein the fan blade on the impeller is radially The design of the outer end of the blade has a larger angle of the forward bend. The centrifugal fan structure of claim 1, wherein each of the blade segments is slightly curved extending toward the direction of rotation of the impeller by a direction of the impeller near the outer edge of the rim along the circumferential tangential line. The centrifugal fan structure of claim 1, wherein the angle between the tangential velocity of the air leaving the trailing end of the blade and the circumferential tangential velocity of the impeller is about ninety degrees. The centrifugal fan structure according to claim 1, wherein at least one of the ribs extending outwardly and fixedly fixing the respective blades is provided at the center of the outer edge of the central rim of the impeller. The centrifugal fan structure of claim 1, wherein the outer casing of the outer casing is a volute. The centrifugal fan structure of claim 1, wherein the outer casing body is further composed of an upper casing and a lower casing, wherein the air inlet is provided at a top end of at least one of the upper casing and the lower casing. Or the bottom end, and the air outlet is disposed on one side of the entire casing body. The centrifugal fan structure of claim 6, wherein the inner surface of the lower casing is provided with a fixed seat for accommodating the fixed motor.