Centrifugal fan

Abstract

A centrifugal fan comprises a shell, a driving part and an impeller. The shell is provided with an air inlet and an air outlet which are communicated with each other, and an in-shell space between the air inlet and the air outlet. The driving part is fixed in the space in the shell and is coaxial with the air inlet. The impeller is arranged in the space in the shell and is coaxially connected with the driving part. The impeller is provided with a plurality of radial blades, and each blade is provided with a flow guide part; a flow channel space is defined between any two adjacent blades in the plurality of blades; each flow guide part is provided with flow guide pieces on the two sides and at least one separation flow guide piece, the adjacent flow guide pieces on the two sides and at least one separation flow guide piece divide the corresponding flow channel space into at least two flow guide areas, and therefore the flow guide effect is improved.

Description

Technical Field

[0001] The present disclosure relates to a centrifugal fan, and more particularly to a centrifugal fan which has higher fan efficiency at the same noise level and is easy to manufacture. Background Art

[0002] See also Fig.12 and 13 . Traditional centrifugal fans include:

[0003] A shell 81 includes an upper shell 811 and a lower shell 812. The upper shell 811 has an air inlet 81A and an air outlet 81B. The upper shell 811 and the lower shell 812 are used to surround an inner shell space 81C, and the inner shell space 81C is connected to the air inlet 81A and the air outlet 81B.

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

[0005] An impeller 83 is disposed in the housing space 81C and coaxially connected to the driving part 82. The impeller 83 includes a wheel disc 831 and a plurality of blades 832. The wheel disc 831 is coaxially connected to the driving part 82 for the impeller 83 and can be driven to rotate; the plurality of blades 832 radially extend outward from the wheel disc 831; a flow channel space S is defined between any two adjacent blades 832 among the plurality of blades 832.

[0006] Thus, when the impeller 83 rotates, a gas 91 enters the shell space 81C through the air inlet 81A, and the gas 91 flows outward along the multiple flow channel spaces S between the multiple blades 32 due to centrifugal force, and is finally discharged through the air outlet 81B.

[0007] However, the disadvantage of conventional centrifugal fans is that they produce considerable noise during normal operation, which is particularly evident when the conventional centrifugal fans are installed in computers. To reduce the noise, the speed must be reduced (and the flow rate will also be reduced), which creates a dilemma.

[0008] In view of this, it is necessary to develop technologies that can solve the above shortcomings. Summary of the invention

[0009] 1. Technical issues to be resolved

[0010] The purpose of the present disclosure is to provide a centrifugal fan which has the advantages of higher fan efficiency at the same noise level and easy manufacturing. In particular, the problem to be solved by the present disclosure is that the conventional centrifugal fan has considerable noise during normal operation, and if the noise is to be reduced, the rotation speed must be reduced (and the flow rate will also be reduced), which creates a dilemma.

[0011] (II) Technical solution

[0012] A technical means to solve the above problem is to provide a centrifugal fan, which includes:

[0013] A shell, comprising an upper shell and a lower shell, the upper shell having an air inlet and an air outlet; the upper shell and the lower shell are used to enclose an inner shell space, the inner shell space is connected to the air inlet and the air outlet;

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

[0015] An impeller is arranged in the space inside the shell and is coaxially connected to the driving part, and the impeller includes a wheel disc and a plurality of blades; the wheel disc is used for the impeller to coaxially connect to the driving part and can be driven to rotate; the plurality of blades extend radially outward from the wheel disc; each of the plurality of blades has a guide portion; a flow channel space is defined between any two adjacent blades of the plurality of blades; each of the aforementioned guide portions has two side guide plates and at least one separating guide plate, and the adjacent two side guide plates and the at least one separating guide plate are used to separate the corresponding flow channel space into at least two guide areas, thereby improving the guide effect.

[0016] (III) Beneficial effects

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

[0018] [1] The fan has higher efficiency at the same noise level. In this case, each of the multiple blades is designed with a guide portion, so that when the centrifugal fan is started, under the condition that the noise level of this case and the conventional device is the same at 48.9 (dB), in addition to the flow rate being increased by about 3.4% compared to the conventional device, the pressure difference is increased by about 19.3% compared to the conventional device. Therefore, the fan has higher efficiency at the same noise level.

[0019] [2] Easy to manufacture. In this case, the guide part is only formed at the end of each blade. This is a technology that can be carried out simultaneously during the blade stamping process and is easy to implement for those familiar with this field. Therefore, it is easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 yes Figure 1 Schematic diagram of the combined appearance.

[0022] Figure 3 yes Figure 1 Schematic diagram of an enlarged portion of the structure.

[0023] Figure 4 yes Figure 3 Schematic diagrams from other angles.

[0024] Figure 5 yes Figure 3 Schematic diagram of the decomposition.

[0025] Figure 6 yes Figure 3 An enlarged schematic diagram of the corresponding relationship of the partial structure.

[0026] Figure 7 yes Figure 3 An enlarged schematic diagram of another corresponding relationship of the partial structure.

[0027] Figure 8 yes Figure 3 Schematic diagram of an enlarged portion of the structure.

[0028] Fig. 9 yes Figure 3 A schematic diagram of a second embodiment of a partial structure.

[0029] Fig. 10A It is a cross-sectional view showing the corresponding relationship of a part of the structure of the first embodiment of the present disclosure.

[0030] Fig. 10B yes Fig. 10A Schematic diagram of the correspondence between the flow channel space and the guide area.

[0031] Fig.11A It is a cross-sectional view showing the corresponding relationship of a part of the structure of the second embodiment of the present disclosure.

[0032] Fig. 11B yes Fig.11A Schematic diagram of the correspondence between the flow channel space and the guide area.

[0033] Fig.12 is a schematic diagram of the appearance of a conventional device.

[0034] Fig.13 yes Fig.12 Schematic diagram of an enlarged portion of the structure. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0036] See also Figure 1-8 , the present disclosure is a centrifugal fan, a first embodiment of which comprises:

[0037] A shell 10 includes an upper shell 11 and a lower shell 12. The upper shell 11 has an air inlet 111 and an air outlet 112. The upper shell 11 and the lower shell 12 are used to surround an inner shell space 10A. The inner shell space 10A communicates with the air inlet 111 and the air outlet 112.

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

[0039] An impeller 30 is disposed in the housing inner space 10A and coaxially connected to the driving unit 20 . The impeller 30 includes a wheel disc 31 and a plurality of blades 32 . The wheel disc 31 is used for the impeller 30 to be coaxially connected to the driving part 20 and can be driven to rotate; the multiple blades 32 extend radially outward from the wheel disc 31; each of the multiple blades 32 has a guide portion 321; a flow channel space S is defined between any two adjacent blades 32 among the multiple blades 32; each of the aforementioned guide portions 321 has two side guide plates 32A and at least one partition guide plate 32B, and the adjacent two side guide plates 32A and the at least one partition guide plate 32B are used to separate the corresponding flow channel space S into at least two guide areas (for example, as shown in Figures 10A and 10B, divided into a first guide area S1 and a second guide area S2. Or, for example, as shown in Figures 11A and 11B, divided into the first guide area S1, the second guide area S2 and a third guide area S3), thereby improving the guide effect.

[0040] In fact, each of the air guide portions 321 may be located at the end or near the end of each of the blades 32 .

[0041] When the impeller 30 rotates, it is used to allow a gas 91 to enter the shell space 10A through the air inlet 111. The gas 91 flows outward from the at least two guide areas (such as the first guide area S1 and the second guide area S2 shown in Figures 10A and 10B) along the multiple blades 32 due to centrifugal force, and is finally discharged through the air outlet 112, thereby improving the guide effect.

[0042] Regarding the first embodiment of the present invention (as shown in FIGS. 10A and 10B ), the guide plates 32A on both sides extend from the corresponding blades 32 in a first direction.

[0043] The at least one partition guide plate 32B extends from the corresponding blade 32 in a second direction, and the second direction is opposite to the first direction.

[0044] The guide plates 32A on both sides and the at least one partition guide plate 32B are parallel to each other, thereby dividing the corresponding flow channel space S into the at least two guide areas S to improve the 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] See also Fig. 9 Regarding the second embodiment of the present case, the difference between it and the first embodiment is that the at least one partition guide plate 32B is two pieces (as shown in Figures 11A and 11B), and the corresponding flow channel space S is also divided into the at least two guide areas S, which can also improve the guide effect.

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

[0048] It is particularly important to note that a conventional centrifugal fan generates considerable noise during normal operation, which is particularly evident when the conventional centrifugal fan is installed in a computer. To reduce the noise, the rotation speed must be reduced (and the flow rate will also be reduced). In order to solve the above problem, the present invention designs the guide portion 321 on each of the plurality of blades 32. Thus, when the centrifugal fan is started, the noise, pressure difference, flow rate and fan rotation speed generated by the present invention and the conventional device are recorded (as shown in Table 1 below):

[0049] Table 1

[0050]

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

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

[0053] The above is only a detailed description of the present disclosure through a preferred embodiment. Any simple modification and change made to the embodiment does not deviate from the spirit and scope of the present disclosure.

[0054] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, 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 shell, comprising an upper shell and a lower shell, the upper shell having an air inlet and an air outlet; the upper shell and the lower shell are used to enclose an inner shell space, the inner shell space is connected to the air inlet and the air outlet; A driving unit fixed to the lower housing, located in the inner space of the housing and coaxial with the air inlet; and An impeller is arranged in the space inside the shell and is coaxially connected to the driving part, and the impeller includes a wheel disc and a plurality of blades; the wheel disc is used for the impeller to coaxially connect to the driving part and can be driven to rotate; the plurality of blades extend radially outward from the wheel disc; each of the plurality of blades has a guide portion; a flow channel space is defined between any two adjacent blades of the plurality of blades; each of the aforementioned guide portions has two side guide plates and at least one separating guide plate, and the adjacent two side guide plates and the at least one separating guide plate are used to separate the corresponding flow channel space into at least two guide areas, thereby improving the guide effect.

2. The centrifugal fan according to claim 1, wherein: When the impeller rotates, it is used to allow a gas to enter the shell space through the air inlet. The gas flows outward from the at least two guide areas along the multiple blades due to centrifugal force and is finally discharged through the air outlet, thereby improving the guide effect.

3. The centrifugal fan according to claim 1, wherein: The guide plates on both sides extend from the first direction of the corresponding blade; The at least one partition guide plate extends from a second direction of the corresponding blade, the second direction being opposite to the first direction; and The guide plates on both sides and the at least one partitioning guide plate are parallel to each other, thereby dividing the corresponding flow channel space into the at least two guide areas; and The at least two flow guiding areas include a first flow guiding area and a second flow guiding area.

4. The centrifugal fan according to claim 1, wherein: The guide plates on both sides extend from the first direction of the corresponding blade; The at least one partition guide plate is two plates; the two partition guide plates extend from the corresponding blade in a second direction, the second direction being opposite to the first direction; The two side guide plates and the two partition guide plates are parallel to each other, thereby dividing the corresponding flow channel space into the at least two guide areas; and The at least two flow guiding areas include a first flow guiding area, a second flow guiding area and a third flow guiding area.

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