Fan and electronic device

Abstract

A fan (100), comprising a housing (10), a hub (20) and an impeller (30), wherein the housing (10) has an accommodating cavity (11); the housing (10) comprises a base plate (12), a cover plate (13) and a side shell (14) which form the accommodating cavity (11), the base plate (12) and the cover plate (13) being arranged in parallel, the side shell (14) being arranged between the base plate (12) and the cover plate (13) and connected to the base plate (12) and the cover plate (13), the cover plate (13) being provided with an air inlet (131) that is in communication with the accommodating cavity (11) and has an aperture smaller than the diameter of the impeller (30), and the side shell (14) being provided with an air outlet (141) in communication with the accommodating cavity (11); the hub (20) is pivotally mounted in the accommodating cavity (11), and the hub (20) and the air inlet (131) are coaxially arranged; the impeller (30) is arranged in the accommodating cavity (11) and is connected to the hub (20); the impeller (30) rotates synchronously with the hub (20) to generate airflow; and the portion of the cover plate (13) facing the impeller (30) is configured as a first arrangement area (Z1) surrounding the air inlet, and the first arrangement area (Z1) is provided with a plurality of first auxiliary air intake holes (132). An electronic device comprises the fan (100). The fan can increase the air output and inhibit airflow overflow.

Description

Fan and electronic device TECHNICAL FIELD

[0001] The present application relates to the field of electronic devices, in particular to a fan and an electronic device. BACKGROUND

[0002] For a notebook computer, the heat dissipation performance of the fan largely determines the use performance of the notebook computer. With the improvement of the performance of the notebook computer, higher requirements are put forward for the heat dissipation performance of the fan. It is known in the prior art that the diameter of the air inlet is usually designed to be smaller than the diameter of the impeller, and the area formed by the diameter of the air inlet and the diameter of the impeller has a ratio, which is called the opening rate. In theory, the larger the opening rate is, the more air flow can be introduced, and the air outlet volume can be improved to achieve better heat dissipation effect. However, in actual application, it is found that when the opening rate is too large, the air that is supposed to be sucked in will overflow from the air inlet, so the opening rate is generally limited to about 0.8, which cannot achieve the purpose of increasing the air outlet volume. There is also known prior art that in addition to the air inlet formed in the shell, a plurality of small holes are formed in the shell. In actual application, the fan is placed in the system, and there is impedance problem in the system, so that the actual application effect is not as good as the performance without entering the system.

[0003] SUMMARY

[0004] The purpose of the present application is to provide a fan that can help improve the air volume and suppress air flow overflow when used in a fan system.

[0005] Another purpose of the present application is to provide an electronic device comprising the above-mentioned fan that can help improve the air volume and suppress air flow overflow when used in a fan system.

[0006] To achieve the above-mentioned purpose, the present application provides a fan comprising a shell, a hub and an impeller. The shell has a receiving cavity. The shell comprises a base plate, a cover plate and a side shell. The base plate and the cover plate are arranged in parallel. The side shell is arranged between the base plate and the cover plate and connected to the base plate and the cover plate. The cover plate is provided with an air inlet communicating with the receiving cavity and having a diameter smaller than that of the impeller. The side shell is provided with an air outlet communicating with the receiving cavity. The hub is pivotally installed in the receiving cavity and coaxially arranged with the air inlet. The impeller is arranged in the receiving cavity and connected to the hub. The impeller generates air flow following the synchronous rotation of the hub. The part of the cover plate surface facing the impeller is configured as a first arrangement area surrounding the air inlet. The first arrangement area is provided with a plurality of first auxiliary air inlets.

[0007] Preferably, the first arrangement area is uniformly provided with the first auxiliary air inlets.

[0008] Preferably, the first arrangement area is configured as a first local area for opening the first auxiliary air inlets. The plurality of first auxiliary air inlets are uniformly distributed in the first local area.

[0009] Preferably, the first auxiliary air inlets are arranged in multiple rows in a straight line, multiple rows in an arc, or in a staggered manner in the first local area.

[0010] Preferably, the first local area is arranged around the air inlet.

[0011] Preferably, the base plate is provided with a secondary air inlet which is in communication with the accommodating cavity and has an area smaller than that of the air inlet, the secondary air inlet is located directly below the air inlet, the part of the base plate facing the impeller is configured as a second arrangement area, and the second arrangement area is provided with multiple second auxiliary air inlets.

[0012] Preferably, the base plate is provided with multiple arc-shaped secondary air inlets, the multiple secondary air inlets are arranged in a circle around the central axis of the hub and are spaced apart at the beginning and end, and a part of the second arrangement area is configured as a second local area for the second auxiliary air inlets, and the multiple second auxiliary air inlets are uniformly distributed in the second local area.

[0013] Preferably, the second local area at least surrounds one secondary air inlet, and the multiple second auxiliary air inlets are arranged in multiple rows in a straight line, multiple rows in an arc, or in a staggered manner in the second local area.

[0014] Preferably, the first auxiliary air inlets and / or the second auxiliary air inlets have a hole diameter which is equal in size from top to bottom, gradually increases / decreases from top to bottom, or is larger at both ends and smaller in the middle.

[0015] Preferably, the first auxiliary air inlets and / or the second auxiliary air inlets are circular holes, elliptical holes, or polygonal holes, the spacing between adjacent two first auxiliary air inlets is 1.1-4 times the thickness of the cover plate, and the spacing between adjacent two second auxiliary air inlets is 1.1-4 times the thickness of the base plate.

[0016] Preferably, the hole diameters of the first auxiliary air inlets are different in size, and the hole diameters of the second auxiliary air inlets are different in size.

[0017] When the fan of the present application is in use, the synchronous rotation of the hub and the impeller generates an air flow, the air flow is guided to flow into the accommodating cavity from the air inlet, and the air flow is allowed to flow out from the air outlet. By setting the hole diameter of the air inlet to be smaller than the diameter of the impeller, the overflow of the guided air flow from the air inlet is reduced. By providing multiple first auxiliary air inlets in the first arrangement area, the air flow can flow into the accommodating cavity through the first auxiliary air inlets, the air inlet amount is increased, and thus the air outlet amount is increased. Since the first arrangement area is still solid, although the first auxiliary air inlets are provided thereon, the overflow of the air flow is still inhibited, and the air outlet amount and the inhibition of the air flow overflow are both increased.

[0018] It can be understood that, since the electronic device of the present application includes the above-mentioned fan, the heat dissipation effect of the electronic device can be improved in the case of increasing the air outlet amount. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 is a perspective view of a fan according to a first embodiment of the present application.

[0020] Fig. 2 is an exploded perspective view of the fan shown in Fig. 1.

[0021] Fig. 3 is a perspective view of a fan according to a second embodiment of the present application.

[0022] Fig. 4 is an exploded perspective view of the fan shown in Fig. 3.

[0023] Fig. 5 is a perspective view of a fan according to a third embodiment of the present application.

[0024] Fig. 6 is an exploded perspective view of the fan shown in Fig. 5.

[0025] Fig. 7 is a perspective view of a fan according to a fourth embodiment of the present application.

[0026] Fig. 8 is an exploded perspective view of the fan shown in Fig. 7.

[0027] Fig. 9 is a perspective view of a fan according to a fifth embodiment of the present application.

[0028] Fig. 10 is an exploded perspective view of the fan shown in Fig. 9.

[0029] Fig. 11 is a perspective view of a fan according to a sixth embodiment of the present application.

[0030] Fig. 12 is an exploded perspective view of the fan shown in Fig. 11.

[0031] Fig. 13 is a perspective view of a fan according to a seventh embodiment of the present application.

[0032] Fig. 14 is an exploded perspective view of the fan shown in Fig. 13.

[0033] Fig. 15 is a perspective view of a fan according to an eighth embodiment of the present application.

[0034] Fig. 16 is an exploded perspective view of the fan shown in Fig. 15.

[0035] Fig. 17 is a perspective view of a fan according to the prior art.

[0036] Fig. 18 is an exploded perspective view of the fan shown in Fig. 17.

[0037] Fig. 19 is a comparison chart of flow rates obtained from tests of the fan according to the prior art shown in Fig. 17 and the fans according to embodiments 1-8 of the present application at a rotational speed of 5000 rpm.

[0038] Fig. 20 is a chart of pressure-flow curves of the fan according to embodiment 1 of the present application and the fan according to the prior art shown in Fig. 17.

[0039] Fig. 21 is a perspective view of another prior art fan.

[0040] Fig. 22 is an air flow rate diagram of the fan shown in Fig. 21.

[0041] Fig. 23 is a schematic view of a pressure-flow curve of the fan of Embodiment 1 provided by the present application and the prior art fan shown in Fig. 21.

[0042] Fig. 24 is an outlet air speed cloud chart of the prior art fan shown in Figs. 17 and 18.

[0043] Fig. 25 is an outlet air speed cloud chart of the fan of Embodiment 1 provided by the present application.

[0044] Fig. 26 is an inlet air flow rate diagram and auxiliary inlet hole of the fan of Embodiment 1 provided by the present application. DETAILED DESCRIPTION

[0045] To explain the technical content and structural features of the present application in detail, the following further description is made in conjunction with the embodiments and the accompanying drawings.

[0046] The present application discloses a fan 100, which can be applied to an electronic device, preferably a portable device such as a notebook computer, a projector, etc. The fan is used for heat dissipation, which can improve the performance of the device.

[0047] As shown in Figs. 1 and 2, the fan 100 of the present application comprises a housing 10, a hub 20 and an impeller 30. The housing 10 has a receiving cavity 11, and comprises a base plate 12, a cover plate 13 and a side shell 14. The base plate 12 and the cover plate 13 are arranged in parallel, and the side shell 14 is arranged between and connected to the base plate 12 and the cover plate 13, and keeps the relative fixation of the base plate 12 and the cover plate 13. The cover plate 13 is provided with an inlet 131 which communicates with the receiving cavity 11 and has a diameter smaller than that of the impeller 30, and the side shell 14 is provided with an outlet 141 which communicates with the receiving cavity 11. The hub 20 is pivotally installed in the receiving cavity 11, and the hub 20 is coaxially arranged with the inlet 131. The impeller 30 is arranged in the receiving cavity 11 and connected to the hub 20, and generates air flow following the synchronous rotation of the hub 20. The part of the cover plate 13 facing the impeller 30 is configured as a first arrangement zone Z1 surrounding the inlet 131, and the first arrangement zone Z1 is provided with a plurality of first auxiliary inlet holes 132.

[0048] The fan 100 provided in the present application, in use, the hub 20 and the impeller 30 rotate synchronously to generate airflow, guide the airflow to flow into the accommodating cavity 11 from the air inlet 131, and let the airflow flow out from the air outlet 141. By setting the caliber of the air inlet 131 to be smaller than the diameter of the impeller 30, the overflow of the introduced airflow from the air inlet 131 is reduced. By opening a plurality of first auxiliary air inlets 132 in the first arrangement area Z1, the airflow can flow into the accommodating cavity 11 through the first auxiliary air inlets 132, the air inlet amount is increased, and thus the air outlet amount is increased. Since the first arrangement area Z1 is still solid, although the first auxiliary air inlets 132 are opened thereon, the overflow of the airflow is still inhibited, and the air outlet amount is still increased and the overflow of the airflow is still inhibited.

[0049] FIG. 17 is a perspective view of a fan 001 of the prior art, and FIG. 18 is a perspective exploded view of the fan 001 of the prior art, which also includes a housing 01, a hub 02, and an impeller 03. The housing 01 includes a base plate 011, a cover plate 012, and a side shell 013, which are structurally mostly the same as the fan of the present application, and are also provided with an accommodating cavity 0111 and an air outlet 0131. The difference lies in that the cover plate 012 is only provided with an air inlet 0121.

[0050] FIG. 20 is a schematic diagram of the air pressure-flow rate curve of the fan of the first embodiment provided in the present application and the fan of the prior art shown in FIG. 17. The air pressure-flow rate curve of the fan 001 of the prior art provided in FIG. 17 and FIG. 18 is a dashed line (Original performance curve) in FIG. 20, and the air pressure-flow rate curve of the fan of the first embodiment provided in the present application is a solid line (Innovation performance curve) in FIG. 20. Compared with the fan of the prior art, the flow rate of the fan of the present application is increased by more than 5%, which shows that the air volume is obviously and effectively increased.

[0051] In addition, the prior art proposes a fan with a unique design, as shown in FIG. 21, in which auxiliary air inlet holes 0122 are arranged at various positions of the cover plate, and the corresponding air pressure-flow rate curve is shown by the dashed line in FIG. 23 (prior art performance curve). The fan 100 according to the first embodiment of the present application is provided with only the first auxiliary air inlet holes 132 in the first arrangement zone Z1, and the corresponding air pressure-flow rate curve is shown by the solid line in FIG. 23 (Innovation performance curve). According to the general understanding, the more the number of holes and the larger the area of the holes in the cover plate, the more air flow can be guided. However, the experimental results are contrary, and the fan according to the present application is helpful to improve the flow rate. Therefore, by arranging the first arrangement zone Z1 in the cover plate 13 and arranging a plurality of first auxiliary air inlet holes 132 in the range defined by the first arrangement zone Z1 to guide air flow into the accommodation cavity 11, the concept of the present application is obviously different from the prior art, and the effect of effectively improving the air volume and simultaneously suppressing air flow overflow is achieved. Therefore, the fan according to the present application is helpful to improve the air volume and suppress air flow overflow when it is actually applied in a fan system.

[0052] It is also worth mentioning that, as shown in FIG. 26, the fan 100 according to the first embodiment of the present application is subjected to a flow rate test experiment, and it is found that the air flow rates through different first auxiliary air inlet holes 132 are different. The sound peaks and sound valleys of the sound waves generated by the air flow through different first auxiliary air inlet holes 132 are staggered and superimposed on each other, which effectively reduces the noise and improves the sound quality. The fan does not emit a harsh noise, and the user experience is better.

[0053] FIG. 24 is a wind speed cloud diagram of the air outlet of the fan according to the prior design shown in FIGS. 17 and 18, and FIG. 25 is a wind speed cloud diagram of the air outlet of the fan according to the first embodiment of the present application. By comparison, it can be obviously found that the flow rate distribution of the air outlet of the fan according to the first embodiment of the present application is wider, the heat dissipation area is wider, the heat dissipation efficiency is higher, and the heat dissipation effect is improved.

[0054] It is also worth mentioning that the range of the first arrangement zone Z1 is clearly defined, and the edge of the first arrangement zone Z1 is located directly above the edge of the impeller 30. The air flow sucked in through the air inlet 131 and the first auxiliary air inlet holes 132 is approximately orthogonal to the air flow blown out through the air outlet 141. The fan 100 has a flat structure to adapt to the light and thin design of electronic equipment.

[0055] As mentioned above, the first arrangement zone Z1 is arranged around the air inlet 131, and the first arrangement zone Z1 is a ring-shaped region. The number and area ratio of the first auxiliary air inlet holes 132 can have various design schemes.

[0056] In the first embodiment provided in the present application, as shown in FIG. 1 and FIG. 2, the first auxiliary air inlet holes 132 are evenly distributed in the first arrangement area Z1, and the number and proportion of the first auxiliary air inlet holes 132 are large, which obviously improves the air outflow.

[0057] In some cases, the first auxiliary air inlet holes 132 can also be arranged in part of the first arrangement area Z1, and the first arrangement area Z1 is configured as a first partial area A1 for arranging the first auxiliary air inlet holes 132, and the first auxiliary air inlet holes 132 are evenly distributed in the first partial area A1. It should be noted that the area of the first partial area A1 is obviously smaller than that of the first arrangement area Z1, but experimental results show that the scheme of evenly distributing the first auxiliary air inlet holes 132 in the first partial area A1 also helps to improve the air outflow. The shape of the first partial area A1 can be designed as a regular shape or an irregular shape, and the first auxiliary air inlet holes 132 can have different arrangements in the first partial area A1.

[0058] Preferably, the first partial area A1 is arranged around the air inlet 131, which allows more first auxiliary air inlet holes 132 to be close to the air inlet 131, and the air flow from the air inlet 131 and the air flow from the first auxiliary air inlet holes 132 can be better combined.

[0059] In the second embodiment provided in the present application, as shown in FIG. 3 and FIG. 4, the first partial area A1 is approximately a right triangle, the side is not a straight line but a curve, the first auxiliary air inlet holes 132 are evenly distributed in the first partial area A1 defined by the right triangle, and at this time, the first auxiliary air inlet holes 132 are arranged in multiple rows in a straight line in the first partial area A1 (25 rows are arranged in this embodiment, and the first auxiliary air inlet holes 132 in each row are arranged in the direction indicated by the arrow K, but the number does not constitute a limitation, and more or fewer rows can be designed according to actual needs), and the number of first auxiliary air inlet holes 132 in each row is different.

[0060] In the third embodiment provided in the present application, as shown in FIG. 5 and FIG. 6, the first partial area A1 is approximately a circular arc, the first auxiliary air inlet holes 132 are evenly distributed in the first partial area A1 defined by the circular arc, and at this time, the first auxiliary air inlet holes 132 are arranged in 3 rows in a circular arc in the first partial area A1, and the number of first auxiliary air inlet holes 132 in each row is different (which can also be the same, not as a limitation), and according to actual needs, more rows of first auxiliary air inlet holes 132 can also be arranged in the first partial area A1.

[0061] In the fourth embodiment provided in the present application, as shown in FIG. 7 and FIG. 8, the first layout area A1 is approximately a circular arc shape (an irregular arc shape), and the first auxiliary air inlet holes 132 are uniformly distributed in the first layout area A1 defined by the circular arc shape. At this time, the first auxiliary air inlet holes 132 are arranged in multiple straight lines (18 lines in this embodiment, and the first auxiliary air inlet holes 132 in each line are arranged in the direction indicated by the arrow M, but the number does not constitute a limitation, and more or fewer lines can be designed in practice) in the first layout area A1, and the number of the first auxiliary air inlet holes 132 included in each line is different.

[0062] In some cases, the first local area A1 can be adjusted in orientation. In the third embodiment, the first local area A1 is arranged at a later position, as shown in FIG. 9 and FIG. 10. In the fifth embodiment provided in the present application, the first local area A1 is arranged at an earlier position, and the layout and arrangement of the first auxiliary air inlet holes 132 and the shape of the first local area A1 are the same. Although the orientation is adjusted, the influence on the air volume is very small, and the air volumes of the two are almost the same. The air volume comparison of the two is described below.

[0063] In some cases, two or more first local areas A1 can be arranged in the first layout area Z1. As shown in FIG. 11 and FIG. 12, in the sixth embodiment provided in the present application, two first local areas A1 are arranged, one of which adopts the layout mode of the second embodiment, and the other of which adopts the layout mode of the fourth embodiment. Due to the increase in the number of the first auxiliary air inlet holes 132, the air volume can be increased. The specific details are described below.

[0064] It is worth noting that the above-mentioned multiple first auxiliary air inlet holes 132 can be arranged in multiple straight lines or multiple circular arcs in the first local area A1, but are not limited to the above two modes. In addition, the multiple first auxiliary air inlet holes 132 can also be arranged in a staggered manner in the first local area A1.

[0065] In addition to increasing the air volume by opening the first auxiliary air inlet holes 132 in the cover plate 13 in the first layout area Z1, the base plate 12 can also be opened to increase the air volume. Since the base plate 12 serves to support the hub 20, the opening area should not be too large.

[0066] Please refer to FIG. 13 and FIG. 14, in the seventh embodiment provided by the present application, compared with the first embodiment, the substrate 12 is provided with a sub-inlet 121 which is in communication with the accommodating cavity 11 and has an area smaller than that of the air inlet 131, the sub-inlet 121 is located directly below the air inlet 131, in addition to the air flow introduced from the air inlet 131, the air flow can also be introduced from the sub-inlet 121, it is worth mentioning that since the area of the sub-inlet 121 is smaller than that of the air inlet 131, the air volume introduced by the sub-inlet 121 is smaller than that of the air inlet 131. In this embodiment, the part of the substrate 12 facing the impeller 30 is configured as a second arrangement area Z2, the second arrangement area Z2 is provided with a plurality of second auxiliary air inlets 122. The air flow can also be introduced through the second auxiliary air inlets 122, further increasing the air inlet volume, according to the theory that the air inlet volume is equal to the air outlet volume, the air outlet volume will also be effectively improved. In this embodiment, the substrate 12 is provided with three circular arc-shaped sub-inlets 121, but the number can be increased or decreased, and the number of openings does not constitute a limitation. The three sub-inlets 121 are arranged in a circle with the central axis of the hub 20 as the center and are arranged separately at the beginning and end, which not only meets the support performance but also makes the air flow more uniformly flow in. The range defined by the second arrangement area Z2 is large and does not necessarily have to be fully perforated.

[0067] In the embodiments provided by the present application, please refer to FIG. 13 and FIG. 14, a partial area of the second arrangement area Z2 is configured as a second partial area A2 for opening the second auxiliary air inlets 122, in this embodiment, the shape of the second partial area A2 is the same as that of the first partial area A1 of the fifth embodiment, and a plurality of second auxiliary air inlets 122 are uniformly distributed in the second partial area A2. That is, in this embodiment, a plurality of second auxiliary air inlets 122 are arranged in three circular arc rows in the second partial area A2, but the number does not constitute a limitation, and more or fewer rows can be designed in practice, and the number of second auxiliary air inlets 122 included in each row can be the same or different.

[0068] Please refer to FIG. 15 and FIG. 16, the present application also provides an eighth embodiment, which is different from the seventh embodiment described above in that the cover plate 13 is provided with two first partial areas A1, one of the first partial areas A1 has the first auxiliary air inlets 132 arranged in the layout mode of the second embodiment, and the other first partial area A1 has the first auxiliary air inlets 132 arranged in the layout mode of the sixth embodiment. In addition, the substrate 12 is provided with one second arrangement area A2, which adopts the layout mode of the second embodiment, and the way of opening the second auxiliary air inlets 122 in the second arrangement area A2 is also the same as that of the second embodiment, and a plurality of second auxiliary air inlets 122 are uniformly distributed in the second partial area A2. That is, in this embodiment, a plurality of second auxiliary air inlets 122 are arranged in multiple linear rows in the second partial area A2, and the number of second auxiliary air inlets 122 included in each row is different.

[0069] It is worth mentioning that the above-mentioned second auxiliary air inlet holes 122 can be arranged in a straight line or in a circular arc in the second local area A2, but are not limited to the above two ways, and in addition, the second auxiliary air inlet holes 122 can also be arranged in a staggered manner in the second local area A2.

[0070] Compared with the fan in the prior art, the fan adopting the technical solution of the present application can effectively increase the air volume. In order to intuitively reflect the above-mentioned advantages, the fan in the prior art and the fans of embodiments 1-8 of the present application are simulated experimentally. Fig. 19 is a comparison diagram of the flow rate obtained by testing the fan in the prior art and the fans of embodiments 1-8 of the present application at a rotating speed of 5000 rpm, in which serial number 1 represents the fan in the prior art, 2A represents the fan adopting the scheme of the first embodiment, 2B represents the fan adopting the scheme of the second embodiment, 3A represents the fan adopting the scheme of the third embodiment, 3B represents the fan adopting the scheme of the fourth embodiment, 4A represents the fan adopting the scheme of the fifth embodiment, 4B represents the fan adopting the scheme of the sixth embodiment, 5A represents the fan adopting the scheme of the seventh embodiment, and 5B represents the fan adopting the scheme of the eighth embodiment. In the case of controlling the same parameters (the same shell, hub and impeller, and the rotating speed is controlled at 5000 rpm), the air volume of serial number 1 is 1.7, and the air volumes of serial numbers 2A-5B are all greater than 1.7. Therefore, the experimental structure shows that the technical solution of the present application can effectively improve the air volume.

[0071] Moreover, the air volumes of the fans adopting the second embodiment (serial number 2A), the sixth embodiment (serial number 4B), the seventh embodiment (serial number 5A) and the eighth embodiment (serial number 5B) are all greater than 2, which shows that the more the air inlet holes, the more conducive to the introduction of airflow. This shows that by arranging the first local area A1 with a larger area or a larger number in the first arrangement area Z1 and arranging the second local area A2 with a larger area or a larger number in the second arrangement area Z2, the number of the first auxiliary air inlet holes 132 and the second auxiliary air inlet holes 122 is increased, which is helpful to increase the air inlet volume and thus increase the air volume.

[0072] The shell 10 of the present application is made of metal material or plastic. The size ratio of the air inlet 131 to the impeller 30 falls within the range of 0.6-0.9, and a suitable ratio can be selected within the range.

[0073] Preferably, the first auxiliary air inlet hole 132 and the second auxiliary air inlet hole 122 are selected as an elliptical hole, and of course can also be selected as a circular hole or a polygonal hole (such as a quadrilateral hole or a hexagonal hole, etc.). The distance between two adjacent first auxiliary air inlet holes 132 is 1.1-4 times the thickness of the cover plate 13, and the preferred range is 1.3-1.5 times. The distance between two adjacent second auxiliary air inlet holes 122 is 1.1-4 times the thickness of the base plate 12, and the preferred range is 1.3-1.5 times. The hole diameters of the first auxiliary air inlet holes 132 can be set to be the same size, but can also be set to be different sizes. The hole diameters of the second auxiliary air inlet holes 122 can be set to be the same size, but can also be set to be different sizes.

[0074] Preferably, the first auxiliary air inlet hole 132 and the second auxiliary air inlet hole 122 are obtained by chemical etching. According to the processing characteristics of chemical etching, the first auxiliary air inlet hole 132 and the second auxiliary air inlet hole 122 have a structure of large at both ends and small in the middle, or a horn-shaped structure that continuously increases or decreases in the direction away from the hub 20. According to actual production needs, the first auxiliary air inlet hole 132 and the second auxiliary air inlet hole 122 can also be obtained by physical drilling, or can also be obtained by stamping with a stamping die. At this time, the first auxiliary air inlet hole 132 and the second auxiliary air inlet hole 122 are holes with consistent diameters from top to bottom.

[0075] Regardless of whether the physical drilling method or the stamping die stamping method is adopted, the hole diameters of the first auxiliary air inlet hole 132 and the second auxiliary air inlet hole 122 can be designed to be the same width from top to bottom, or gradually increase / decrease from top to bottom, or have a structure of large at both ends and small in the middle. It is worth noting that, under the condition of controlling the same parameters (the same shell, hub and impeller, and the control of the rotating speed at 5000 rpm), the test is carried out by adopting the scheme of the first embodiment, and the test flow rate is 10.66 CFM when the first auxiliary air inlet hole 132 is applied as a hole with the same diameter from top to bottom, and the test flow rate is 12.56 CFM when the first auxiliary air inlet hole 132 is applied as a hole with a structure of large at both ends and small in the middle. In addition, the test flow rate is also greater than 10.66 CFM when the first auxiliary air inlet hole 132 is applied as a hole with a gradually increasing or gradually decreasing diameter from top to bottom. It can be seen that, applying the first auxiliary air inlet hole 132 as a hole with a structure of large at both ends and small in the middle, or a hole with a gradually increasing or gradually decreasing diameter from top to bottom is also helpful to improve the air output.

[0076] The above only discloses the preferred examples of the present application, and cannot limit the scope of the rights of the present application. Therefore, equivalent changes made according to the claims of the present application are all within the scope covered by the present application.

Claims

1. A fan, characterized by: The fan comprises a housing, a hub and an impeller, the housing has a containing cavity, the housing comprises a base plate, a cover plate and a side shell, the base plate and the cover plate are arranged in parallel, the side shell is arranged between and connected to the base plate and the cover plate, the cover plate is provided with an air inlet communicating with the containing cavity and having a diameter smaller than that of the impeller, the side shell is provided with an air outlet communicating with the containing cavity, the hub is pivotally installed in the containing cavity, the hub is coaxially arranged with the air inlet, the impeller is arranged in the containing cavity and connected to the hub, the impeller generates airflow following the synchronous rotation of the hub, the part of the cover plate facing the impeller is configured as a first arrangement area surrounding the air inlet, and the first arrangement area is provided with a plurality of first auxiliary air inlets.

2. The fan of claim 1, wherein, The first auxiliary air inlets are uniformly arranged in the first arrangement area.

3. The fan of claim 1, wherein, Part of the first arrangement area is configured as a first partial area for forming the first auxiliary air inlets, and the first auxiliary air inlets are uniformly arranged in the first partial area.

4. The fan of claim 3, wherein, The first auxiliary air inlets are arranged in multiple rows in a linear manner, multiple rows in an arc manner or in a staggered manner in the first partial area.

5. The fan of claim 3, wherein, The first partial area is arranged around the air inlet.

6. The fan of claim 1, wherein, The base plate is provided with a secondary air inlet communicating with the containing cavity and having an area smaller than that of the air inlet, the secondary air inlet is located directly below the air inlet, the part of the base plate facing the impeller is configured as a second arrangement area, and the second arrangement area is provided with a plurality of second auxiliary air inlets.

7. The fan of claim 6, wherein, The base plate is provided with a plurality of arc-shaped secondary air inlets, the secondary air inlets are arranged in a circle with the central axis of the hub as the center and are arranged separately at the beginning and the end, part of the second arrangement area is configured as a second partial area for forming the second auxiliary air inlets, and the second auxiliary air inlets are uniformly arranged in the second partial area.

8. The fan of claim 7, wherein, The second partial area surrounds at least one secondary air inlet, and the second auxiliary air inlets are arranged in multiple rows in a linear manner, multiple rows in an arc manner or in a staggered manner in the second partial area.

9. The fan of claim 7, wherein, The diameters of the first auxiliary air inlets and / or the second auxiliary air inlets are equal from top to bottom, gradually increase from top to bottom, gradually decrease from top to bottom, or are large at both ends and small in the middle.

10. The fan of claim 7, wherein, The first auxiliary air inlets and / or the second auxiliary air inlets are circular holes, elliptical holes or polygonal holes, the distance between two adjacent first auxiliary air inlets is 1.1-4 times the thickness of the cover plate, and the distance between two adjacent second auxiliary air inlets is 1.1-4 times the thickness of the base plate.

11. The fan of claim 7, wherein, The diameters of the first auxiliary air inlets are different, and the diameters of the second auxiliary air inlets are different.

12. An electronic device, comprising: The fan as claimed in any one of claims 1-11 is installed in the casing.

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