Fan rotor, heat dissipation fan and electronic device

Abstract

A fan rotor, a heat dissipation fan and an electronic device. The fan rotor comprises a central shaft (11), a plurality of first blades (12), a plurality of second blades (13), and a fixing ring (14). The periphery of the central shaft (11) is provided with first regions (101) and second regions (102) alternately distributed in the circumferential direction. The plurality of first blades (12) are arranged in the first regions (101) around the central shaft (11), and first ends of the plurality of first blades (12) are connected to the central shaft (11). The plurality of second blades (13) are arranged in the second regions (102) around the central shaft (11), and first ends of the plurality of second blades (13) are connected to the central shaft (11). The fixing ring (14) is arranged around the central shaft (11), and the fixing ring (14) is connected to second ends of the plurality of first blades (12). The fan rotor can improve the heat dissipation capability of the heat dissipation fan.

Description

Fan rotor, cooling fan and electronic equipment

[0001] This application claims priority to Chinese Patent Application No. 202410634079.7, filed on May 21, 2024, entitled "Fan Rotor, Cooling Fan and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of heat dissipation technology for electronic devices, and in particular to a fan rotor, a cooling fan, and an electronic device. Background Technology

[0003] With the continuous development of electronic technology, the manufacturing processes of core components in electronic devices have been greatly improved. At the same time, various electronic devices are gradually becoming smaller. This results in the heat generated by various heat-generating components in electronic devices becoming more concentrated. As this heat accumulates, the normal operation of some components in electronic devices can be affected. Therefore, it is necessary to adopt certain heat dissipation methods to cool down the heat-generating components in electronic devices.

[0004] Currently, air cooling remains a widely used heat dissipation method. Air cooling uses cooling fans to dissipate heat, which increase airflow during operation, transferring heat from specific areas to the outside in a timely manner. The cooling capacity of the cooling fan determines the performance of electronic devices. Therefore, improving the cooling capacity of cooling fans is an important issue.

[0005] Summary of the Invention

[0006] The purpose of this application is to provide a fan rotor, a cooling fan, and an electronic device that can improve the heat dissipation capacity of the cooling fan.

[0007] To address the aforementioned technical problems, embodiments of this application provide a fan rotor, which includes a central shaft, a plurality of first blades, a plurality of second blades, and a retaining ring. The central shaft is surrounded by alternating first and second regions distributed circumferentially. The plurality of first blades are arranged around the central shaft in the first region, with their first ends connected to the central shaft. The plurality of second blades are also arranged around the central shaft in the second region, with their first ends connected to the central shaft. The retaining ring is arranged around the central shaft and connected to the second ends of the plurality of first blades.

[0008] An embodiment of this application also provides a cooling fan, which includes a housing, a fan stator, and the aforementioned fan rotor. The fan stator is disposed within the housing, and the fan rotor is rotatably connected to the fan stator.

[0009] The embodiment of the present application further provides an electronic device, which comprises the heat dissipation fan.

[0010] The fan rotor, the heat dissipation fan and the electronic device provided by the embodiment of the present application utilize the hollow area on one side of the blade, and simultaneously arrange the first blade and the second blade. One of the first blade and the second blade has the air suction characteristic, so that the air pressure can be improved, and the air inlet amount of the air inlet of the heat dissipation fan is improved. The hollow area on one side of the blade reserves the air inlet area near the blade, and provides the favorable condition for the air inlet of the air inlet of the heat dissipation fan. By utilizing the hollow area on one side of the blade and the blade with the air suction characteristic, the air suction effect is added on the basis of the air flow effect formed by the original blade, and the air pressure is improved. Therefore, the air inlet amount of the heat dissipation fan is effectively improved, and the heat dissipation capacity of the heat dissipation fan is improved.

[0011] In some embodiments, the fan rotor further comprises a plurality of third blades, the plurality of third blades are arranged around the central axis in the second area, the first end of each third blade is connected with the fixed ring, and the second end of each third blade extends and is arranged towards the second blade in the same area. In this way, by arranging the third blade in the area where the second blade is located, the action area of the blade can be increased, and the sweeping effect of the blade is ensured.

[0012] In some embodiments, the surrounding direction of the plurality of second blades is opposite to the surrounding direction of the plurality of first blades. In this way, by making the second blade surround in the direction opposite to the first blade, a sufficient and non-obstructed air inlet area can be reserved on the side of the second blade close to the central axis, which is beneficial to improve the air volume of the heat dissipation fan.

[0013] In some embodiments, the third blades in the same area are a plurality of third blades, and the lengths of the plurality of third blades in the same area gradually increase or gradually decrease in the circumferential direction of the central axis. In this way, by arranging the third blade with the length change, the third blade can be fully extended while fully adapting to the outside space of the second blade.

[0014] In some embodiments, the plurality of first blades are centrifugal blades, and the plurality of second blades are axial flow blades. In this way, by arranging different blades in different areas, the flow disturbance effects of different blades in their respective positions can be combined, which is beneficial to improve the heat dissipation capacity of the heat dissipation fan.

[0015] In some embodiments, the second end of the plurality of second blades extends to the position where the fixed ring is located, and is connected with the fixed ring. In this way, by connecting the second blade with the fixed ring, the connection stability of the whole blade can be ensured.

[0016] In some embodiments, the projection of each second blade towards the adjacent first blade is located within the edge of the first blade. In this way, by accommodating the second blade within the area between two adjacent first blades, the space occupation can be reduced, and the volume can be reduced.

[0017] In some embodiments, the plurality of second blades and the plurality of first blades are distributed in different planes, and at least a portion of each second blade protrudes from the edge of the first blade in the axial direction of the central axis. In this way, by making the second blade protrude from the edge of the first blade, the effective area of the second blade can be increased, thereby improving the air suction capacity of the second blade. BRIEF DESCRIPTION OF DRAWINGS

[0018] One or more embodiments are illustrated by way of example in the figures that form a part of this patent document, and which do not limit the scope of embodiments, the elements in the drawings are not necessarily to scale, except where otherwise noted, and the figures in the drawings do not necessarily represent the prior art, and the description and illustrations are made below to explain certain embodiments.

[0019] FIG. 1 is a structural schematic diagram of a fan rotor of a centrifugal heat dissipation fan in the prior art;

[0020] FIG. 2 is a three-dimensional structural schematic diagram of a fan rotor of a heat dissipation fan according to some embodiments of the present application;

[0021] FIG. 3 is a front view structural schematic diagram of a fan rotor of a heat dissipation fan according to some embodiments of the present application;

[0022] FIG. 4 is a top view structural schematic diagram of a fan rotor of a heat dissipation fan according to some embodiments of the present application;

[0023] FIG. 5 is a top view structural schematic diagram of a fan rotor of a heat dissipation fan according to some other embodiments of the present application;

[0024] FIG. 6 is a three-dimensional structural schematic diagram of a fan rotor of a heat dissipation fan according to some other embodiments of the present application;

[0025] FIG. 7 is a three-dimensional structural schematic diagram of a fan rotor of a heat dissipation fan according to some other embodiments of the present application;

[0026] FIG. 8 is a top view structural schematic diagram of a fan rotor of a heat dissipation fan according to some other embodiments of the present application;

[0027] FIG. 9 is a top view structural schematic diagram of a fan rotor of a heat dissipation fan according to some other embodiments of the present application;

[0028] FIG. 10 is a three-dimensional structural schematic diagram of a fan rotor of a heat dissipation fan according to some other embodiments of the present application;

[0029] Fig. 11 is a top view of a fan rotor in a heat dissipation fan according to some embodiments of the present application;

[0030] Fig. 12 is a perspective view of a centrifugal heat dissipation fan according to the prior art;

[0031] Fig. 13 is a perspective view of an axial heat dissipation fan according to the prior art. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and based on various changes and modifications of the following embodiments. The division of the following embodiments is for the convenience of description, and should not constitute any limitation on the specific embodiments of the present application. The embodiments can be combined and referenced to each other without contradiction.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the description and the claims of this application and the above description of the drawings, the terms "comprising" and "having" and any variations thereof, are intended to cover not only the inclusive but also the exclusive.

[0034] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] With the continuous miniaturization of electronic devices, the demand for heat dissipation is also increasing. For example, computers, notebooks and other electronic devices have designed many different heat dissipation forms such as air cooling, liquid cooling and the like for devices with high heat generation. In air cooling, heat dissipation fans are mainly used to dissipate heat from heat generating components. The fan rotor of the heat dissipation fan can enhance the air flow rate during rotation, thereby improving the heat exchange efficiency in the air. During the operation of the heat dissipation fan, the heat generated during the operation of the heat generating component can be continuously conducted to the surrounding air, thereby completing heat dissipation.

[0036] At present, the centrifugal cooling fan is widely used in electronic equipment. As shown in FIG. 1, the fan rotor of the centrifugal cooling fan is formed with a plurality of centrifugal blades 300 on the center shaft 100 and the fixed ring 200. The centrifugal cooling fan can timely conduct the heat at a specific area, and is widely used in different electronic equipment.

[0037] However, when the flow rate of the existing centrifugal cooling fan is large, the air pressure is small. When the air pressure is large, the flow rate is small. Due to the large system impedance and small air inlet space, the flow loss in the system is too large, thereby affecting the cooling capacity of the cooling fan.

[0038] In order to improve the cooling capacity of the cooling fan, some embodiments of the present application provide a cooling fan which can be applied to notebook computers, personal computers (PC) and other electronic equipment. The fan rotor of the cooling fan is provided with blades with rotor characteristics, which can effectively overcome the problem of small system flow rate under the condition of large system impedance and poor air inlet condition. The performance bottleneck of the existing centrifugal cooling fan can be broken, the overall cooling capacity and use experience can be enhanced, and the overall system performance can be optimized.

[0039] The blades with rotor characteristics can improve the flow rate and air pressure of the cooling fan. The fan rotor of the cooling fan provided by some embodiments of the present application is provided with blades with rotor characteristics on the basis of the centrifugal blades. The air inlet amount of the cooling fan can be increased while the air sweeping capacity of the cooling fan is ensured, the performance of the cooling fan can be effectively improved, the backflow resistance of the cooling fan can be enhanced, the flow loss of the cooling fan and the system can be reduced, the flow rate of the cooling fan into the system can be improved under the same size, the performance bottleneck of the conventional centrifugal cooling fan can be broken, and the cooling capacity of the cooling fan can be improved.

[0040] The fan rotor of the cooling fan provided by some embodiments of the present application will be described below with reference to FIGS. 2-11.

[0041] As shown in FIGS. 2-7, the fan rotor provided by some embodiments of the present application includes a center shaft 11, a plurality of first blades 12, a plurality of second blades 13 and a fixed ring 14. The periphery of the center shaft 11 is provided with a first area 101 and a second area 102 which are alternately distributed in the circumferential direction. The plurality of first blades 12 are arranged around the center shaft 11 in the first area 101, and the first ends of the plurality of first blades 12 are connected with the center shaft 11. The plurality of second blades 13 are arranged around the center shaft 11 in the second area 102, and the first ends of the plurality of second blades 13 are connected with the center shaft 11. The fixed ring 14 is arranged around the center shaft 11, and the fixed ring 14 is connected with the second ends of the plurality of first blades 12.

[0042] The central shaft 11 is a part of the fan rotor for fixing the blades, which can also be referred to as a blade disc or hub of the blades, or forms a motor shell. The fan rotor cooperates with the fan stator and rotates relative to the fan stator under the driving of the motor. In the process of rotating with the central shaft 11, the blades will disturb the surrounding air to form an air flow and promote the heat exchange of the gas.

[0043] The plurality of first blades 12 and the plurality of second blades 13 are arranged around the central shaft 11. For example, the plurality of first blades 12 and the plurality of second blades 13 can be arranged around the same center. One of the first blades 12 and the second blades 13 plays a role of directional heat dissipation in the fan rotor, and the other has the air suction capacity.

[0044] For example, in some cases, the first blades 12 can be centrifugal blades. The number of the first blades 12 is large, and the plurality of first blades 12 generates centrifugal force when rotating to disturb the air to generate an air flow flowing in a specific direction. The first blades 131 extend from the edge of the central shaft 11 to the fixed ring 14 at the periphery of the central shaft 11. The edge of the first blades 131 can terminate at the fixed ring 14. The edge of the first blades 131 can also extend beyond the fixed ring 14 by a part to ensure the air sweeping capacity of the blades.

[0045] The second blades 13 can be axial flow blades and have the air suction capacity to improve the air intake. In actual cases, in the direction around the central shaft 11, one side edge of the second blades 13 is closer to the first blades 131 than the other side edge, having the axial air suction characteristic of a rotor blade. The second blades 13 as the blades with the air suction capacity can play the role of air suction in the reserved area on the side of the first blades 131 to make the gas flow along the axial direction of the central shaft 11. Through the axial air suction capacity of the second blades 13, the air intake of the heat dissipation fan can be effectively improved.

[0046] It should be noted that the embodiments of the present application take the first blades 12 as centrifugal blades and the second blades 13 as axial flow blades as examples for description. In actual cases, the first blades 12 can be axial flow blades and the second blades 13 can be centrifugal blades. That is, the centrifugal blades and the axial flow blades can be selected according to actual cases and arranged in the first area 101 and the second area 102. The centrifugal blades and the axial flow blades can be designed to have the same length or different lengths. When the two types of blades have different lengths, the length of the centrifugal blades can be greater than that of the axial flow blades, or the length of the axial flow blades can be greater than that of the centrifugal blades. When the first blades 12 and the second blades 13 extend from the root to the tip, they can extend along a curve to fully extend the blades, which is conducive to improving the air volume and air pressure.

[0047] In addition, the shape and number of the axial flow blades are not limited in the embodiments of the present application, and any blade that can realize the basic function of the axial flow blade is within the protection scope of the present application. Similarly, the shape and number of the centrifugal flow blades are not limited in the embodiments of the present application, and any blade that can realize the basic function of the centrifugal flow blade is within the protection scope of the present application.

[0048] The fixing ring 14 is arranged at the periphery of the central shaft 11, can play a fixing role at the end of the blade, and can keep the whole blade stable during operation. Thus, the noise during operation of the blade is weakened, and the fixing ring 14 can also be called a mute ring. The number of the fixing ring 14 can be one or more, and the fixing ring 14 can be connected together with the first blade 12 and the central shaft 11. When the extension length of the second blade 13 is basically consistent with that of the first blade 12, the second blade 13 can also be connected together with the central shaft 11.

[0049] The fan rotor provided by some embodiments of the present application utilizes the hollow area on one side of the blade, and simultaneously arranges the first blade 12 and the second blade 13. One of the first blade 12 and the second blade 13 has the air suction feature, which can improve the air pressure and thus improve the air intake of the air inlet. The hollow area on one side of the blade reserves the air intake area near the blade, and provides favorable conditions for the air intake of the air inlet of the cooling fan. By utilizing the hollow area on one side of the blade and the blade with the air suction feature, the air suction effect is added on the basis of the air flow effect formed by the original blade, and the air pressure is improved. Thus, the air intake of the cooling fan is effectively improved, and the cooling capacity of the cooling fan is improved.

[0050] In some embodiments, the fan rotor can further include a plurality of third blades 15, and the plurality of third blades 15 are arranged around the central shaft 11 in the second area 102. The first end of each third blade 15 is connected with the fixing ring 14, and the second end of each third blade 15 extends towards the second blade 13 in the same area.

[0051] The third blade 15 is of the same type as the first blade 12 or the second blade 13, i.e. the third blade 15 can be a centrifugal blade or an axial blade, and the centrifugal effect or the suction effect of the blade can be enhanced. The third blade 15 is connected to the fixed ring 14. The length of the third blade 15 is less than that of the first blade 12. The third blade 15 occupies only a small part of the space outside the central shaft 11 relative to the first blade 12 with a complete shape. At this time, the length of the second blade 13 is less than that of the first blade 12, and a space is left outside the second blade 13. By arranging the third blade 15 in this part of the space, the edge sweeping ability of the cooling fan can be ensured while the air inlet area is sufficient. In order to improve the stability of the third blade 15, the fixed ring 14 can be arranged at both ends of the third blade 15 for connection. In actual cases, the second end of the third blade 15 can also be connected to the second blade 13.

[0052] When the first blade 12 and the third blade 15 are arranged at the same time, a part of the sweeping blades in the blade coverage area of the centrifugal cooling fan can be reduced, changed to a short blade design, and the second blade 13 is added to the vacancy. At this time, the third blade 15 has a gap with the central shaft 11, and a reserved area is formed on one side in the thickness direction of the first blade 12, and a plurality of second blades 13 can be distributed in a plurality of reserved areas. Each reserved area can be distributed with one second blade 13 or a plurality of second blades 13. The arrangement form of the third blade 15 and the first blade 12 can be regular alternating distribution or random distribution without rules.

[0053] In actual cases, the fan rotor shown in FIGS. 2 to 6 can be designed by combining the first blade 12, the third blade 15 and the second blade 13. The fan rotor shown in FIG. 7 can be designed by combining the first blade 12 and the second blade 13. Or as shown in FIG. 8, the fan rotor adopts the composite blade of the second blade 13 and the third blade 15, and part of the third blade 15 can be connected with the adjacent second blade 13.

[0054] In addition, the two types of blades in the fan rotor can also be arranged in different planes. As shown in FIG. 9, the fan rotor adopts the composite blades of the first blades 12 and the second blades 13, and the two types of blades are arranged in layers and can also be joined together. As shown in FIG. 10, in the layered arrangement, the second blades 13 can also be arranged at an obtuse angle relative to the inclination angle of the first blades 12. Alternatively, the second blades 13 of the fan rotor can also be directly formed on the first blades 12 to form the composite blades as shown in FIG. 11. In actual cases, the second blades 13 can have various shapes, including but not limited to the straight blades or curved blades of different sizes or different degrees of deformation shown in FIGS. 2 to 11. In the curved blades, the blades can have a root part that is more curved, or a tip part that is more curved, or a root part and a tip part that are curved to the same degree.

[0055] As shown in FIG. 6, in some embodiments, the circumferential direction of the second blades 13 can be opposite to the circumferential direction of the first blades 12.

[0056] The second blades 13 and the first blades 12 can each have a certain inclination angle when arranged, that is, when the blades are arranged, the tip of the blade and the root of the blade can not be in the same radial direction of the central axis 11. That is, the tip of the blade can be inclined toward one side, and the direction of the inclination can be defined as the circumferential direction of the blade. In the case shown in FIG. 6, the tip of the first blade 12 is arranged to be inclined to the first blade 12 located at a later position in the clockwise direction, that is, the first blade 12 is arranged to be circumferentially arranged in the clockwise direction. The overall extension direction of the first blade 12 is arranged at an acute angle to the tangential direction of the central axis 11, and the second blade 13 is circumferentially arranged in the opposite direction, and the overall extension direction of the second blade 13 is arranged at an obtuse angle to the tangential direction.

[0057] By arranging the second blades 13 in the opposite direction to the first blades 12, sufficient and unobstructed air inlet areas can be reserved without occupying too much space for arranging the centrifugal blades. This can improve the air inlet amount of the cooling fan and improve the cooling performance of the cooling fan.

[0058] In some embodiments, there can be multiple third blades 15 in the same area, and the lengths of the multiple third blades 15 in the same area gradually increase or gradually decrease in the circumferential direction of the central axis 11.

[0059] By setting the third blades 15 with varying lengths, the space left by the second blades 13 arranged obliquely can be well adapted. Thus, the length of the third blades 15 is fully extended, effectively improving the sweeping capacity of the blades. As shown in FIG. 6, the lengths of the multiple third blades 15 in the same region can gradually increase in the clockwise direction around the central axis 11, so as to be fully extended on the side where the second blades 13 are away from the central axis 11, and improve the effective area of the blades.

[0060] In addition, the second end of the third blade 15 can be connected with the second blade 13 to improve the connection stability of the whole blade.

[0061] In actual cases, the first blades 12 and the third blades 15 can be distributed in combination at different intervals. When multiple first blades 12 are distributed together, the overall distribution density of the blades can be ensured, thereby ensuring the sweeping capacity of the whole blades. When multiple third blades 15 are distributed together, the size of the left air inlet area can be ensured to be appropriate, and sufficient air inlet area can be provided without forming excessive shielding.

[0062] As shown in FIGS. 2 to 4, the first blades 12 and the third blades 15 can be distributed in combination at intervals of three. That is, from the direction of the center of the central axis 11, three first blades 12 and three third blades 15 are alternately distributed. The sweeping capacity of the whole blades can be ensured while providing sufficient air inlet area. The distribution forms of the first blades 12 and the third blades 15 can also be as shown in FIGS. 5 and 6. As shown in FIG. 5, the first blades 12 are distributed in combination at intervals of four, and the third blades 15 are distributed in combination at intervals of one. As shown in FIG. 6, the first blades 12 and the third blades 15 are multiple, and the lengths of the multiple third blades 15 in the same region gradually change with the shape of the second blades 13. In actual cases, the first blades 12 and the third blades 15 can also be distributed in other forms.

[0063] In some embodiments, the multiple first blades 12 can be centrifugal blades, and the multiple second blades 13 can be axial flow blades.

[0064] The centrifugal fan 110 shown in Fig. 12 is arranged in the first region 101, and the axial fan 130 shown in Fig. 13 is arranged in the second region 102. The centrifugal fan 110 is capable of arranging a large number of centrifugal blades 120, and the centrifugal blades 120 have a large radial area and generate airflow in the radial direction shown by arrow M in Fig. 12 when rotating. The centrifugal blades 120 can have a good wind sweeping effect. The axial fan 130 is capable of arranging a small number of axial blades 140, and the axial blades 140 have a large axial area and generate airflow in the axial direction shown by arrow N in Fig. 13 when rotating. The axial blades 140 have a forward or backward inclination, and the axial blades 140 have a large axial area and generate airflow in the axial direction when rotating. The axial blades 140 are arranged in a large area.

[0065] In some embodiments, when the third blades 15 are of the same type as the first blades 12, the third blades 15 and the first blades 12 can be arranged in the same plane, and the third blades 15 and the first blades 12 can be uniformly distributed around the central shaft 11.

[0066] That is, the centrifugal blades including the third blades 15 and the first blades 12 are arranged around the central shaft 11 in a uniform manner. This can ensure that the centrifugal blades arranged around the central shaft 11 have a uniform wind sweeping effect, thereby ensuring the stability of the cooling fan during operation.

[0067] As shown in Fig. 7, when the length of the second blades 13 is substantially the same as the length of the first blades 12, the second blades 13 can be connected to the fixed ring 14. That is, the second ends of the second blades 13 extend to the position of the fixed ring 14 and are connected to the fixed ring 14.

[0068] By extending the second blades 13, the second blades 13 can have a large area and have a good axial air suction effect. In addition, the connection of the second blades 13 to the fixed ring 14 can ensure the stability of the connection of the blades, thereby ensuring the stability of the cooling fan during operation.

[0069] In some embodiments, when the second blades 13 are axial blades, each second blade 13 can be inclined in the same direction relative to the first blades 12, or each second blade 13 can be curved in the same direction relative to the first blades 12.

[0070] The inclination of the second blades 13, or the bending of the second blades 13, can facilitate the axial air suction of the heat dissipation fan. When the second blades 13 are inclined or bent relative to the first blades 12, the air suction characteristics similar to the rotor blades can be formed, so that the second blades 13 form a pressure difference on both sides of the central shaft 11, thereby improving the air suction amount.

[0071] In actual cases, the inclined blades can be conveniently manufactured and formed, and the curved blades can enhance the air suction capacity. The inclined blades can be straight plate blades, that is, the whole is planar, and the whole is inclined relative to the first blades 12. The curved blades can be curved blades with large ends and small roots, or curved blades with small ends and large roots. In addition, in order to adjust the air suction capacity of the second blades 13, different bending degrees can be designed.

[0072] In some embodiments, the projection of each second blade 13 towards the adjacent first blade 12 is located within the edge of the first blade 12.

[0073] That is, the overall size of the second blade 13 does not exceed the first blade 12, and the second blade 13 can be placed in the reserved area on one side of the first blade 131. The length and width of the second blade 13 are both smaller than those of the first blade 12, so that the projection of the second blade 13 towards the adjacent first blade 12 is located within the edge of the first blade 12. Further, the second blade 13 does not occupy additional space for arrangement, which is beneficial to reduce the volume of the fan rotor.

[0074] In some embodiments, the plurality of second blades 13 and the plurality of first blades 12 can be distributed on different planes, and at least part of each second blade 13 protrudes from the edge of the first blade 12 in the axial direction of the central shaft 11.

[0075] The second blades 13 are arranged at the air inlet of the fan rotor, and can be distributed on different planes with the first blades 12 and protrude from the edge of the first blades 12 on the air inlet side. Thus, the effective area of the second blades 13 is increased, and axial air flow is formed in a larger area to increase the air suction amount of the fan rotor.

[0076] In addition, the plurality of first blades 12 can be uniformly distributed around the central shaft 11, and / or the plurality of second blades 13 can be uniformly distributed around the central shaft 11.

[0077] When the first blades 12 and the second blades 13 are uniformly arranged, they can uniformly play a disturbance role around the central shaft 11, and the stress of the blades is more uniform, so that the operation process of the fan rotor is more stable. The first type and the second type of blades 132 in the first blades 12 can be uniformly arranged.

[0078] In some embodiments, the plurality of first blades 12 and the plurality of second blades 13 can be integrally formed with the central shaft 11.

[0079] With the integrally formed structure, the connection strength between structures can be effectively improved. The first blades 12 and the second blades 13 are blades of different shapes and sizes, and in the manufacturing process, the blades are prone to connection failure due to different manufacturing processes. The composite of the first blades 12 and the second blades 13 in the integrally formed manner can ensure the connection strength of the blades after the composite. In addition, the fixing ring 14 and the third blade 15 can also be integrally formed with the central shaft 11.

[0080] In some embodiments, the central shaft 11 can include a first central shaft and a second central shaft connected to each other, and the first end of each first blade 12 is connected to the first central shaft 11, and the first end of each second blade 13 is connected to the second central shaft 11.

[0081] The two central shafts 11 can provide a fixing basis for different blades. When forming a fan rotor with composite blades, the two central shafts 11 can be fixedly connected, so that the blades on the two central shafts 11 are combined together. The manufacturing of the fan rotor is facilitated, which can be conducive to the manufacturing of complex-shaped blades, and the characteristics of the west wind blades are fully utilized.

[0082] In actual situations, a collar can also be used instead of the central shaft 11, and the second blades 13 are formed around the collar. Then the collar is matched with the central shaft 11 of the first blades 12 to form composite blades.

[0083] As shown in Table 1 below, through simulation comparison, the suction capacity of the heat dissipation fan with composite blades at the air inlet is obviously better, and the maximum static pressure of the heat dissipation fan with composite blades in actual sample making is larger than that of the conventional centrifugal heat dissipation fan. From the simulation data, it can be concluded that under the condition of consistent rotating speed, the maximum air volume of the heat dissipation fan with composite blades is increased by about 16.2%. Therefore, in the heat dissipation fan provided in some embodiments of the present application, the fan rotor adopts composite blades, which can combine the characteristics of centrifugal blades and axial flow blades together, and has the advantages of high air volume and high air pressure.

[0084] Table 1, simulation comparison data table of centrifugal heat dissipation fan and heat dissipation fan with composite blades. Wherein, RPM refers to Revolutions Per Minute, i.e. revolutions per minute; Q max refers to maximum air volume, cfm refers to cubic feet per minute, i.e. cubic feet per minute; P max refers to maximum static pressure, mmaq refers to millimeter aqueous, i.e. millimeter water column.

[0085] In actual cases, the fan rotor can be made in different forms, for example, can be made by integral mold, the conventional centrifugal blade is changed into a long-short blade design, and a blade with air suction function is added to the short blade. The integral mold has low mold opening cost, and the air suction blade can adopt an inclined straight plate type blade or a simple shaped axial flow type blade.

[0086] The fan rotor can also be made in a form of separate mold injection. The blades made separately are combined together by welding, bonding or other forms. Since the composite blade is made by separate mold, the shape of the air suction blade can be more complex, and the characteristics of the axial flow type fan blade can be fully utilized, and the overall performance of the composite blade can be greatly improved.

[0087] Some embodiments of the present application also provide a cooling fan, which comprises a housing, a fan stator and the above-mentioned fan rotor. The fan stator is arranged in the housing, and the fan rotor is rotationally connected with the fan stator.

[0088] The cooling fan can greatly improve the performance without increasing the cost by using the composite blade. The air suction blade can improve the anti-resistance ability of the cooling fan and improve the system flow conversion rate of the cooling fan. In addition, the blade mold can be mass produced, and the respective characteristics of the centrifugal blade and the axial flow blade can be combined together to significantly improve the air volume and air pressure of the cooling fan. The flow channel of the cooling fan can also be optimized to guide a small part of the air flow to the heat source concentration area for heat dissipation, thereby improving the overall system heat dissipation ability and performance.

[0089] Some embodiments of the present application also provide an electronic device comprising the above-mentioned cooling fan.

[0090] The electronic device can use the above-mentioned cooling fan at a component with large heat generation. Based on the longitudinal air suction characteristics of the second blade, the air intake at the air inlet of the cooling fan can be increased. Then the air intake is more horizontally compressed by the combination of the long-short blades in the first blade, which can effectively increase the air volume and air pressure at the air outlet. Moreover, the second blade has a large suction force to one side, which can reduce the overflow of the air volume from the air inlet, and the anti-resistance ability of the cooling fan into the system is strong, and the conversion efficiency after entering the system is high, and the system flow is also high. Therefore, the heat exchange efficiency of the system can be improved, and the heat dissipation performance can be improved. The problem of insufficient system air volume of the ultra-thin notebook and other electronic devices can be solved, the size of the cooling fan can be reduced while ensuring the performance of the cooling fan, the space usage area and the product weight can be reduced, and the performance and use feel of the overall system under the same conditions can be improved.

[0091] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for implementing the present application, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the present application.

Claims

1. A fan rotor, characterized by, Comprising: a central shaft, a periphery of the central shaft being provided with first regions and second regions alternately distributed in a circumferential direction; a plurality of first blades, the plurality of first blades being disposed in the first regions around the central shaft, first ends of the plurality of first blades being connected with the central shaft; a plurality of second blades, the plurality of second blades being disposed in the second regions around the central shaft, first ends of the plurality of second blades being connected with the central shaft; a fixing ring, the fixing ring being disposed around the central shaft, the fixing ring being connected with second ends of the plurality of first blades.

2. The fan rotor according to claim 1, further comprising a plurality of third blades, the plurality of third blades being disposed in the second regions around the central shaft, first ends of the plurality of third blades being connected with the fixing ring, second ends of the plurality of third blades extending towards the second blades in the same region.

3. The fan rotor according to claim 2, wherein circumferential directions of the plurality of second blades are opposite to circumferential directions of the plurality of first blades.

4. The fan rotor according to claim 3, wherein there are a plurality of third blades in the same region, and lengths of the plurality of third blades in the same region gradually increase or gradually decrease in the circumferential direction of the central shaft.

5. The fan rotor according to claim 1, wherein the plurality of first blades are centrifugal blades, and the plurality of second blades are axial flow blades.

6. The fan rotor according to claim 1, wherein second ends of the plurality of second blades extend to a position where the fixing ring is located, and are connected with the fixing ring.

7. The fan rotor according to claim 1, wherein a projection of each of the second blades towards an adjacent one of the first blades is located inside an edge of the first blade.

8. The fan rotor according to claim 1, wherein in an axial direction of the central shaft, at least a part of each of the second blades protrudes from the edge of the first blade. Comprising: a housing; a fan stator disposed in the housing; the fan rotor according to any one of claims 1 to 8, the fan rotor being rotationally connected with the fan stator. The heat dissipation fan comprising the fan rotor according to claim 9. ​ ​ 9. A heat dissipating fan characterized by comprising: ​ ​ ​ ​ 10. An electronic device, comprising: ​

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