Centrifugal fan

Abstract

A centrifugal fan includes a housing, a driving part and an impeller. The housing has an air inlet, an air outlet and a housing space. The driving part is fixed in the housing space and coaxial with the air inlet. The impeller is arranged in the housing space and coaxial with the driving part. The impeller has a plurality of radial blades, each of which has a guide part. Any two adjacent blades define a flow channel space. Each guide part has two side guide pieces and at least one partition guide piece. The two side guide pieces and the at least one partition guide piece separate the corresponding flow channel space into at least two guide areas, thereby improving the guide effect.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a centrifugal fan, and more particularly to a centrifugal fan with higher fan efficiency under the same noise and easy to manufacture. BACKGROUND

[0002] Reference Figure 12 and 13 The conventional centrifugal fan includes:

[0003] A housing 81 includes an upper housing 811 having an air inlet 81A and an air outlet 81B, and a lower housing 812 for enclosing an inner space 81C in communication with the air inlet 81A and the air outlet 81B.

[0004] A driving portion 82 is fixed to the lower housing 812 and located in the inner space 81C coaxially with the air inlet 81A.

[0005] An impeller 83 is disposed in the inner space 81C coaxially linked to the driving portion 82, and includes a disc 831 and a plurality of blades 832. The disc 831 is coaxially linked to the driving portion 82 and can be driven to rotate. The plurality of blades 832 extend radially outward from the disc 831, and any two adjacent blades 832 of the plurality of blades 832 define a flow passage space S therebetween.

[0006] Thus, when the impeller 83 rotates, a gas 91 enters the inner space 81C through the air inlet 81A, and flows outward along the flow passage spaces S between the plurality of blades 32 by centrifugal force, and is finally discharged through the air outlet 81B.

[0007] However, the conventional centrifugal fan has the disadvantage of generating considerable noise during normal operation, especially when the conventional centrifugal fan is installed in a computer. If the noise is to be reduced, the rotation speed must be reduced (while the flow rate is also reduced), resulting in a dilemma.

[0008] Therefore, a technology that can solve the above-mentioned problems must be developed. SUMMARY

[0009] (1) Technical problem to be solved

[0010] The present disclosure aims to provide a centrifugal fan with higher fan efficiency under the same noise and easy to manufacture. In particular, the problem to be solved by the present disclosure is that the conventional centrifugal fan generates considerable noise during normal operation, and if the noise is to be reduced, the rotation speed must be reduced (while the flow rate is also reduced), resulting in a dilemma.

[0011] (II) Technical Solution

[0012] The technical means for solving the above problems is to provide a centrifugal fan, which comprises:

[0013] a housing, comprising an upper housing and a lower housing, the upper housing having an air inlet and an air outlet; the upper housing and the lower housing are used to enclose a housing inner space, which is communicated with the air inlet and the air outlet;

[0014] a driving part, fixed to the lower housing and located in the housing inner space and coaxial with the air inlet; and

[0015] an impeller, provided in the housing inner space and coaxially connected to the driving part, the impeller comprising a disc and a plurality of blades; the disc is used for coaxially connecting the impeller to the driving part and can be driven to rotate; the plurality of blades extend radially outward from the disc; each blade of the plurality of blades has a flow guide part; any two adjacent blades of the plurality of blades define a flow channel space therebetween; each flow guide part has two side flow guide pieces and at least one partition flow guide piece, the two adjacent side flow guide pieces and the at least one partition flow guide piece are used to divide the corresponding flow channel space into at least two flow guide areas, thereby improving the flow guide effect.

[0016] (III) Advantages

[0017] The advantages and effects of the present disclosure can be summarized as follows:

[0018] [1] Higher fan efficiency under the same noise. The present case only designs the flow guide part in each blade of the plurality of blades, which can increase the flow by about 3.4% and the pressure difference by about 19.3% under the same noise value of 48.9(dB) generated by the traditional device when starting the centrifugal fan. Therefore, the fan efficiency is higher under the same noise.

[0019] [2] Easy to manufacture. The present case only shapes the flow guide part at the end of each blade, which is a technology that can be performed simultaneously during the stamping process of the blade, and it is easy to implement and completely no difficulty for those skilled in the art. Therefore, it is easy to manufacture. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is an exploded schematic view of the first embodiment of the present disclosure.

[0021] Figure 2 is a schematic view of the combined appearance of Figure 1 .

[0022] Figure 3 is an enlarged schematic view of part of the structure of Figure 1 .

[0023] Figure 4 is a perspective view of the other angle of Figure 3

[0024] Figure 5 is an exploded view of Figure 3

[0025] Figure 6 is an enlarged view of the corresponding relationship of the partial structure of Figure 3

[0026] Figure 7 is an enlarged view of another corresponding relationship of the partial structure of Figure 3

[0027] Figure 8 is an enlarged view of the partial structure of Figure 3

[0028] Figure 9 is a view of the second embodiment of the partial structure of Figure 3

[0029] Figure 10A is a sectional view of the corresponding relationship of the partial structure of the first embodiment of the present disclosure.

[0030] Figure 10B is a view of the corresponding relationship of the flow channel space and the flow guide area of Figure 10A

[0031] Figure 11A is a sectional view of the corresponding relationship of the partial structure of the second embodiment of the present disclosure.

[0032] Figure 11B is a view of the corresponding relationship of the flow channel space and the flow guide area of Figure 11A

[0033] Figure 12 is a view of the appearance of the conventional device.

[0034] Figure 13 is an enlarged view of the partial structure of Figure 12 DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present disclosure more clear, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the drawings.

[0036] Referring to Figures 1-8 , the present disclosure is a centrifugal fan, and the first embodiment thereof comprises:

[0037] ​​​​​​​​​A housing 10, comprising an upper housing 11 and a lower housing 12, the upper housing 11 having an air inlet 111 and an air outlet 112; the upper housing 11 and the lower housing 12 are used to enclose a housing inner space 10A, which is communicated with the air inlet 111 and the air outlet 112.

[0038] A driving portion 20, fixed to the lower housing 12, and located in the housing inner space 10A, and coaxial with the air inlet 111.

[0039] A impeller 30, disposed in the housing inner space 10A, and coaxial with the driving portion 20, the impeller 30 comprising a disc 31 and a plurality of blades 32. The disc 31 is used for the impeller 30 to be coaxial with the driving portion 20, and can be driven to rotate; the plurality of blades 32 extend radially outward from the disc 31; each blade 32 of the plurality of blades 32 has a flow guide portion 321; any adjacent two blades 32 of the plurality of blades 32 define a flow channel space S; each flow guide portion 321 has two side flow guide pieces 32A and at least one separation flow guide piece 32B, the two side flow guide pieces 32A and the at least one separation flow guide piece 32B are used to separate the corresponding flow channel space S into at least two flow guide regions (for example, as shown in FIGS. 10A and 10B, separated into a first flow guide region S1 and a second flow guide region S2. Or for example, as shown in FIGS. 11A and 11B, separated into the first flow guide region S1, the second flow guide region S2 and a third flow guide region S3), thereby improving the flow guide effect.

[0040] In fact, each flow guide portion 321 can be located at the end or adjacent to the end of each blade 32.

[0041] When the impeller 30 rotates, a gas 91 enters the housing inner space 10A through the air inlet 111, and the gas 91 flows outward along the plurality of blades 32 from the at least two flow guide regions (for example, the first flow guide region S1 and the second flow guide region S2 shown in FIGS. 10A and 10B) by centrifugal force, and finally discharged through the air outlet 112, thereby improving the flow guide effect.

[0042] Regarding the first embodiment of the present case (as shown in FIGS. 10A and 10B), the two side flow guide pieces 32A extend out from a first direction of the corresponding blade 32.

[0043] The at least one separation flow guide piece 32B extends out from a second direction of the corresponding blade 32, the second direction being opposite to the first direction.

[0044] The two side flow guide pieces 32A and the at least one separation flow guide piece 32B are parallel to each other, thereby separating the corresponding flow channel space S into the at least two flow guide regions S to improve the flow guide effect.

[0045] The at least two flow guiding areas S include a first flow guiding area S1 and a second flow guiding area S2.

[0046] Referring to Figure 9 As to the second embodiment of the present application, the difference between the first embodiment and the second embodiment is that the at least one partitioning flow guiding piece 32B is two pieces (as shown in Figs. 11A and 11B), which also divides the corresponding flow channel space S into the at least two flow guiding areas S, and can also improve the flow guiding effect.

[0047] The at least two flow guiding areas S include the first flow guiding area S1, the second flow guiding area S2, and a third flow guiding area S3.

[0048] It is particularly noted that the conventional centrifugal fan has considerable noise when it is normally operated, especially when the conventional centrifugal fan is installed in a computer. If the noise is to be reduced, the rotation speed must be reduced (and the flow rate will also be reduced). The present application is directed to the foregoing problem, and the flow guiding portion 321 is designed in each of the plurality of blades 32. In this way, when the centrifugal fan is started, the noise, pressure difference, flow rate, and fan rotation speed generated by the present application and the conventional device are recorded (as shown in Table 1 below):

[0049] Table 1

[0050]

[0051] As can be clearly seen from Table 1 above, when the present application and the conventional device are compared under the same noise value conditions, the flow rate of the present application is 2.72 (CFM), which is better than the flow rate of 2.63 (CFM) of the conventional device, with an increase of about 3.4%.

[0052] Similarly, when the present application and the conventional device are compared under the same noise value conditions, the pressure difference of the present application is 111.3 (Pa), which is also better than the pressure difference of about 97.4 (Pa) of the conventional device, with an increase of about 19.3%. Therefore, it can be proved that the present application is better than the conventional centrifugal fan.

[0053] The above only describes the present disclosure in detail through the preferred embodiments, and any simple modification and change made to the embodiments does not deviate from the spirit and scope of the present disclosure.

[0054] The above-described specific embodiments further specifically describe the purpose, technical solutions, and beneficial effects of the present disclosure, and it should be understood that the above-described only specific embodiments of the present disclosure, and is not used to limit the present disclosure, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A centrifugal fan, comprising: A housing includes an upper housing and a lower housing, the upper housing having an air inlet and an air outlet; the upper housing and the lower housing are used to enclose an internal space, the internal space being connected to the air inlet and the air outlet; A drive unit, fixed to the lower housing and located within the housing space, and coaxial with the air inlet; and An impeller is disposed within the housing space and coaxially connected to the drive unit. The impeller includes a disk and a plurality of blades. The disk provides the impeller with a coaxial connection to the drive unit and can be driven to rotate. The plurality of blades extend radially outward from the disk. Each of the plurality of blades has a flow guide portion. A flow channel space is defined between any two adjacent blades. Each of the aforementioned flow guide portions has two side flow guides and at least one dividing flow guide, and the adjacent side flow guides and at least one dividing flow guide are used to divide the corresponding flow channel space into at least two flow guide zones. The two guide vanes extend outward from the corresponding two ends of the blade along the first direction; In the axial direction, the at least one dividing guide vane is located between the two guide vanes, and the dividing guide vane and the two guide vanes in the same flow channel space have an overlapping area in the axial direction; In the radial direction, at least one of the separating guide vanes is located radially outside the two guide vanes; The at least one deflector extends from a second direction corresponding to the blade, the second direction being opposite to the first direction; and The two side guide vanes and the at least one dividing guide vane are parallel to each other, thereby dividing the corresponding flow channel space into at least two flow guiding zones; and The at least two diversion zones include a first diversion zone and a second diversion zone.

2. The centrifugal fan according to claim 1, wherein, When the impeller rotates, it allows gas to enter the internal space of the housing through the air inlet. The gas flows outward from the at least two guide zones along the multiple blades by centrifugal force and is finally discharged through the air outlet.

3. The centrifugal fan according to claim 1, wherein: The at least one deflector is two pieces; The at least two diversion zones include a first diversion zone, a second diversion zone, and a third diversion zone.

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