Crossflow fan and electronic device

Abstract

The application provides a cross-flow fan and an electronic device. The cross-flow fan comprises a housing mechanism, a driving mechanism and a fan blade. The housing mechanism is provided with a receiving cavity, an air inlet and an air outlet. The air inlet and the air outlet are arranged on the side surface of the housing mechanism and are in communication with the receiving cavity. The driving mechanism is installed in the receiving cavity. The driving mechanism comprises a rotor and a stator. The rotor is installed on one side of the stator and can rotate relative to the stator under the driving of the stator along the thickness direction of the cross-flow fan. The fan blade is installed in the receiving cavity and is arranged on the rotor and located on the side of the rotor away from the stator. The cross-flow fan can form a higher air volume, which is beneficial to improving the heat dissipation effect of the heating device in the electronic device.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and more particularly to a cross-flow fan and electronic equipment. Background Technology

[0002] As electronic devices develop towards higher performance and thinner designs, the heat flux density of heat-generating components in these devices has increased dramatically. To prevent excessively high temperatures from affecting the performance and user experience of electronic devices, cooling fans are commonly used to cool these components. However, existing cooling fans have relatively small airflow and are not very effective at dissipating heat from these components. Summary of the Invention

[0003] The purpose of this application is to provide a cross-flow fan and an electronic device, which can generate a high airflow, thereby improving the heat dissipation effect on heat-generating devices.

[0004] This application provides a cross-flow fan, the cross-flow fan comprising:

[0005] The housing mechanism has a receiving cavity, an air inlet and an air outlet. The air inlet and the air outlet are both located on the side of the housing mechanism and are connected to the receiving cavity, and are spaced apart from each other.

[0006] The drive mechanism is installed in the receiving cavity. The drive mechanism includes a rotor and a stator. Along the thickness direction of the cross-flow fan, the rotor is installed on one side of the stator and can rotate relative to the stator under the drive of the stator.

[0007] And the fan blades, which are installed in the receiving cavity, are located on the rotor component and are situated on the side of the rotor component away from the stator component.

[0008] This application provides a cross-flow fan that utilizes a stator component of a drive mechanism to drive a rotor component to rotate. The rotor component's rotation drives the fan blades to rotate, and the fan blades' rotation causes airflow, thereby achieving the cooling effect of the cross-flow fan. Furthermore, the cross-flow fan provided in this application embodiment achieves a side-intake, side-exhaust cooling effect by providing an air inlet and outlet on the side of the housing mechanism, thus facilitating the formation of a side-intake, side-exhaust cooling effect in electronic devices assembled with the cross-flow fan. Additionally, by placing the drive mechanism within the housing mechanism's receiving cavity, the problem of reduced airflow caused by externally mounted motors in existing cross-flow fans is avoided. On the other hand, by setting the fan blades on the side of the rotor component away from the stator component, both the stator and rotor components of the drive mechanism are arranged at the bottom of the fan blades. This ensures that the drive mechanism does not occupy the flow channel space inside the fan blades, and there are no protrusions formed by the motor in the flow channel of the fan blades. This avoids the problem of forming large-diameter protrusions in the flow channel inside the fan blades, keeps the flow channel of the fan blades unobstructed, ensures the flow characteristics of the cross-flow fan, and helps to increase the air volume of the cross-flow fan. In turn, it helps to improve the heat dissipation effect of the cross-flow fan on the heat-generating components in electronic devices.

[0009] In one possible implementation, the stator includes a first circuit board and a coil winding, while the rotor includes a mounting housing and a magnet. Along the thickness direction of the cross-flow fan, the mounting housing is mounted on one side of the first circuit board, the coil winding is located on the side of the first circuit board facing the mounting housing, the magnet is located on the side of the mounting housing facing the first circuit board and opposite to the coil winding, and the fan blades are located on the side of the mounting housing away from the magnet. The first circuit board supplies power to the coil winding, which generates an axial magnetic field parallel to the rotation axis. This axial magnetic field passes through the magnet, causing a Lorentz force between the coil winding and the magnet, driving the magnet to rotate relative to the first circuit board, thereby rotating the mounting housing. The rotation of the mounting housing drives the fan blades to rotate, which in turn causes airflow, achieving a heat dissipation effect.

[0010] In one possible implementation, the stator component includes a first circuit board and a magnet, and the rotor component includes a mounting shell and a coil winding. Along the thickness direction of the cross-flow fan, the mounting shell is mounted on one side of the first circuit board, the magnet is disposed on the side of the first circuit board facing the mounting shell, the coil winding is disposed on the side of the mounting shell facing the first circuit board and is disposed opposite to the magnet, and the fan blades are disposed on the side of the mounting shell away from the magnet.

[0011] The drive mechanism also includes a conductive rail, which is disposed on the first circuit board, protrudes towards the mounting housing, and is electrically connected between the first circuit board and the coil winding; alternatively, the conductive rail is disposed on the mounting housing, protrudes towards the first circuit board, and is electrically connected between the first circuit board and the coil winding. By providing the conductive rail, the first circuit board supplies power to the coil winding through the conductive rail. The coil winding generates an axial magnetic field parallel to the axis of rotation. This axial magnetic field passes through a magnet disposed on the first circuit board, causing a Lorentz force between the coil winding and the magnet, driving the coil winding to rotate relative to the first circuit board, thereby causing the mounting housing to rotate. The rotation of the mounting housing drives the fan blades to rotate, and the rotation of the fan blades drives airflow, thereby achieving a heat dissipation effect.

[0012] In one possible implementation, there are multiple coil windings spaced apart from each other, and multiple magnets spaced apart from each other, with each magnet positioned opposite a coil winding.

[0013] In one possible implementation, the first circuit board has a mounting groove that extends through the first circuit board along its thickness direction. The mounting housing has a receiving groove with an opening on the surface of the mounting housing facing the first circuit board. A bearing member passes through the mounting groove, and at least a portion of the bearing member is received within the receiving groove. By providing the receiving groove to accommodate at least a portion of the bearing member, the mounting housing and the bearing member can reuse the dimensions of the cross-flow fan along its thickness direction. This allows for a reduction in the dimensions of the drive mechanism along the thickness direction of the cross-flow fan. On the one hand, this reduces the overall size of the cross-flow fan; on the other hand, when the thickness of the cross-flow fan is fixed, it increases the space of the fan blade flow channel, thereby improving the airflow of the cross-flow fan.

[0014] In one possible implementation, the mounting housing includes a first housing portion and a second housing portion, the first housing portion being disposed around the second housing portion, the opening of the receiving groove being disposed on the surface of the second housing portion facing the first circuit board, and the bottom wall of the receiving groove protruding relative to the first housing portion in a direction away from the first circuit board.

[0015] In one possible implementation, the housing mechanism includes a first cover, a second cover, and a side wall. The first cover and the second cover are spaced apart and arranged opposite each other along the thickness direction of the cross-flow fan. The side wall is connected between the first cover and the second cover and has an air inlet and an air outlet. The first cover has a slot that penetrates the first cover along its thickness direction, and at least a portion of the first circuit board is exposed relative to the slot, so as to enable the housing mechanism to dissipate heat from the first circuit board.

[0016] In one possible implementation, the fan blade includes a plurality of blades, which are spaced apart along the circumferential direction of the mounting housing.

[0017] In one possible implementation, the bearing component includes a base, a bushing, and a core. The bushing is mounted on the base, the core is located inside the bushing and can rotate relative to the bushing, and the rotor component is fixedly connected to the core and rotates relative to the stator component around the center line of the core.

[0018] This application also provides an electronic device, including a heat-generating device and a cross-flow fan as described above, the cross-flow fan being used to dissipate heat from the heat-generating device.

[0019] In the electronic device provided in this application embodiment, the cross-flow fan has a large air volume, which can improve the heat dissipation effect on heat-generating devices.

[0020] In one possible implementation, the electronic device further includes a housing component, which has an accommodating space, a first opening, and a second opening. Both the first opening and the second opening are located on the side of the housing component and are connected to the accommodating space. The heating element and the cross-flow fan are both installed in the accommodating space. The air inlet is arranged opposite to the first opening, and the air outlet is arranged opposite to the second opening.

[0021] In the electronic device provided in this application embodiment, by setting the air inlet and air outlet of the cross-flow fan on the side of the cross-flow fan, the cross-flow fan can form the effect of side air intake and side air exhaust. Furthermore, by setting the first port and the second port on the side of the housing of the electronic device, with the first port facing the air inlet of the cross-flow fan and the second port facing the air outlet, the electronic device can form the effect of side air intake and side air exhaust. No gap is required between the cross-flow fan and the bottom casing of the electronic device; the cross-flow fan can directly contact the bottom casing. This allows for an increase in the thickness of the cross-flow fan within the fixed thickness space of the electronic device, thereby increasing its performance and improving heat dissipation for heat-generating components. This increases the thermal design power (TDP) of the cross-flow fan, ultimately reducing the casing temperature of the electronic device. This avoids the problem encountered with existing electronic devices using centrifugal fans, where the centrifugal fan's air intake is bottom-in, side-out. A gap is needed between the centrifugal fan and the bottom casing to ensure airflow, which reduces the height of the centrifugal fan, resulting in a decrease in airflow and consequently a drop in the thermal design power (TDP) of the electronic device.

[0022] In one possible implementation, the housing mechanism is further provided with a clearance opening that communicates with the receiving cavity. The electronic device also includes an electrical connector and a second circuit board, both of which are installed in the receiving space. The electrical connector passes through the clearance opening and is electrically connected between the stator and the second circuit board. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application when it is in a closed state;

[0025] Figure 2 for Figure 1 A partial structural diagram of the electronic device shown;

[0026] Figure 3 for Figure 2 A schematic diagram of the cross-flow fan in the electronic device shown in the first embodiment;

[0027] Figure 4 for Figure 3 The exploded view of the cross-flow fan is shown.

[0028] Figure 5 for Figure 4 A schematic diagram of the assembly structure of the drive mechanism and fan blades in the cross-flow fan shown.

[0029] Figure 6 for Figure 5 A schematic diagram of the stator component in the drive mechanism of the assembly structure shown;

[0030] Figure 7 for Figure 5 A schematic diagram of the rotor component in the drive mechanism of the assembly structure shown;

[0031] Figure 8 for Figure 5 A schematic diagram of the cross-sectional structure of the assembly shown;

[0032] Figure 9 for Figure 8 A schematic diagram of part A in the cross-sectional structure shown;

[0033] Figure 10 for Figure 5 A top view of the assembly structure shown.

[0034] Figure 11 for Figure 3 A schematic diagram of the cross-sectional structure of the cross-flow fan shown;

[0035] Figure 12 for Figure 3 A side view of the cross-sectional structure of the cross-flow fan shown;

[0036] Figure 13 An exploded view of the cross-flow fan provided in the second embodiment of this application;

[0037] Figure 14 A schematic diagram of the cross-sectional structure of the cross-flow fan provided in the third embodiment of this application;

[0038] Figure 15 for Figure 14 A top view of the stator component in the cross-flow fan shown.

[0039] Figure 16 for Figure 14 The diagram shows a bottom view of the rotor component in the cross-flow fan. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the electronic device 1 provided in the embodiments of this application when it is in a closed state. Figure 2 for Figure 1 A partial structural schematic diagram of the electronic device 1 shown. Wherein, Figure 1 and Figure 2 The arrows in the diagram indicate wind direction.

[0042] This application provides an electronic device 1, which can be a mobile terminal such as a mobile phone, tablet computer, laptop computer, wearable device, smart bracelet, navigation device, large-screen TV, or desktop computer. In this application embodiment, a laptop computer is used as an example to illustrate the electronic device 1.

[0043] For ease of description, the following definitions are provided. Figure 1 The length direction of the electronic device 1 shown is the X-axis, the width direction is the Y-axis, and the thickness direction is the Z-axis. The X-axis, Y-axis, and Z-axis are all perpendicular to each other. The directional terms such as "top" and "bottom" used in the description of the electronic device 1 in this application are based on the appendix to the specification. Figure 1 The description of the orientation shown, with the positive direction of the Z-axis as "top" and the negative direction of the Z-axis as "bottom", does not constitute a limitation on the actual application scenario of the electronic device 1.

[0044] In this embodiment, the electronic device 1 includes a first body 1000 and a second body 3000, which are rotatably connected.

[0045] Specifically, the first main body 1000 includes a housing 100, a keyboard, a heating element, and a cross-flow fan 700. The housing 100 has a first opening 103, a second opening 105, and an accommodating space 170. Both the first opening 103 and the second opening 105 are located on the side of the housing 100 and communicate with the accommodating space 170, and are spaced apart from each other. Specifically, the thickness direction of the housing 100 is the Z-axis direction. The housing 100 includes a mounting bracket, a bottom shell 130, and side shells 150. The mounting bracket and the bottom shell 130 are arranged opposite each other along the thickness direction of the housing 100, and the side shells 150 are connected between the mounting bracket and the bottom shell 130. The side shells 150, the bottom shell 130, and the mounting bracket enclose the accommodating space 170. In this embodiment, the side shell 150 includes a first side shell 151 and a second side shell 153. The first side shell 151 extends along the width direction of the electronic device 1, and the second side shell 153 extends along the length direction of the electronic device 1. In this embodiment, the first opening 103 and the second opening 105 are both located on the side shell 150 of the housing member 100 and are spaced apart from each other, so that the first opening 103 and the second opening 105 are located on the side of the housing member 100. Specifically, the first opening 103 is located on the first side shell 151 and penetrates through it. The second opening 105 is located on the second side shell 153 and penetrates through it. Both the first opening 103 and the second opening 105 communicate with the accommodating space 170, so that both the first opening 103 and the second opening 105 communicate with the inner side of the housing member 100.

[0046] The keyboard is mounted on a mounting bracket to allow it to be mounted on the housing 100. Both the heat-generating components and the cross-flow fan 700 are mounted in the accommodating space 170 and spaced apart from each other, so that both are mounted inside the housing 100. Exemplarily, the heat-generating components include a second circuit board 510, a processor, memory modules, and a graphics card. Exemplarily, the second circuit board 510 is the motherboard of the electronic device 1, and the processor, memory modules, and graphics card are all integrated on the motherboard.

[0047] The thickness direction of the cross-flow fan 700 is the Z-axis direction. The cross-flow fan 700 is provided with a receiving cavity 701 (see...). Figure 3 The cross-flow fan 700 includes an air inlet 703, an air outlet 705, and a clearance opening, all of which are connected to the receiving cavity 701 of the cross-flow fan 700. The air inlet 703 and air outlet 705 are both located on the side of the cross-flow fan 700, with the air inlet 703 opposite to the first outlet 103 and the air outlet 705 opposite to the second outlet 105.

[0048] In this embodiment, the first main body 1000 of the electronic device 1 further includes an electrical connector 900, which is installed in the accommodating space 170. The electrical connector 900 has a clearance opening and is electrically connected between the second circuit board 510 and the cross-flow fan 700, so that the second circuit board 510 supplies power to the cross-flow fan 700. For example, the electrical connector 900 includes a first connector, a second connector, and a cable. The cable is electrically connected between the first connector and the second connector. The first connector is electrically connected to the second circuit board 510, and the second connector is electrically connected to the cross-flow fan 700, so that the second circuit board 510 is electrically connected to the cross-flow fan 700 through the electrical connector 900.

[0049] The second body 3000 includes a housing 200 and a display screen. The housing 200 is rotatably connected to the housing 100 to achieve a rotatable connection between the second body 3000 and the first body 1000. The display screen is mounted on the housing 200.

[0050] In this embodiment, the electronic device 1 includes a closed state and an open state. When the electronic device 1 is in the closed state, the display screen in the second body 3000 is attached to the first body 1000. When the electronic device 1 is in the open state, the display screen in the second body 3000 is open relative to the first body 1000, and the display screen can display images for easy viewing by the user.

[0051] When the electronic device 1 is working, the cross-flow fan 700 operates and drives air circulation, so that the outside air flows into the housing space 170 of the housing 100 from the first port 103. The air in the housing space 170 of the housing 100 enters the housing cavity 701 of the cross-flow fan 700 through the air inlet 703, and flows out from the second port 105 through the air outlet 705 of the cross-flow fan 700. In this way, the heat generated by the heat-generating device is carried away by the air flow, thereby achieving heat dissipation of the heat generated by the heat-generating device.

[0052] In the electronic device 1 provided in this application embodiment, by setting the air inlet 703 and air outlet 705 of the cross-flow fan 700 on the side of the cross-flow fan 700, the cross-flow fan 700 can form the effect of side air intake and side air exhaust. Furthermore, by setting the first port 103 and the second port 105 on the side of the housing 100 of the electronic device 1, and setting the first port 103 opposite to the air inlet 703 of the cross-flow fan 700, and setting the second port 105 opposite to the air outlet 705, the electronic device 1 can form the effect of side air intake and side air exhaust.

[0053] This application embodiment also studies the side-to-side airflow scheme of the Fermat-based cross-flow fan 700 and the original centrifugal fan scheme, comparing the highest case temperature of electronic device 1 under the same TDP. Specifically, taking a laptop computer as an example, the system airflow of the cross-flow fan 700 and the centrifugal fan and the highest case temperature of the laptop computer with a TDP of 40W are recorded. The results are shown in Table 1. In Table 1, the X, Y, and Z dimensions are the dimensions of the cross-flow fan 700 or the centrifugal fan. "CFM" stands for Cubic Feet Per Minute, a unit of gas flow rate, representing cubic feet per minute.

[0054] Table 1. Impact of cross-flow fans and centrifugal fans on the performance of electronic device 1

[0055]

[0056] As can be seen from Table 1, the air volume of the entire system based on the side-inlet and side-outlet airflow scheme of the cross-flow fan 700 is much higher than that of the existing centrifugal fan system. Furthermore, the maximum case temperature of the electronic device 1 assembled based on the cross-flow fan 700 is approximately 7°C lower than that of the electronic device 1 assembled with a conventional centrifugal fan. Experimental results show that in the electronic device 1 provided in this application embodiment, no gap is required between the cross-flow fan 700 and the bottom shell 130. The cross-flow fan 700 and the bottom shell 130 can be in direct contact. Therefore, within the fixed thickness space of the electronic device 1, the thickness of the cross-flow fan 700 can be increased to increase the performance of the cross-flow fan 700, improve the heat dissipation effect on heat-generating devices, thereby increasing the thermal design power (TDP) of the cross-flow fan 700, and thus reducing the shell temperature of the electronic device 1. This avoids the problem that when the existing electronic device 1 uses a centrifugal fan, because the air intake method of the centrifugal fan is bottom intake and side exhaust, a gap needs to be reserved between the centrifugal fan and the bottom shell 130 to ensure the air intake of the centrifugal fan. However, the reserved gap will reduce the height of the centrifugal fan, thereby reducing the air volume of the centrifugal fan and thus reducing the thermal design power (TDP) of the electronic device 1.

[0057] See Figure 3 and Figure 4 , Figure 3 for Figure 2 The schematic diagram of the cross-flow fan 700 in the first embodiment of the electronic device 1 shown is as follows. Figure 4 for Figure 3 The exploded structural diagram of the cross-flow fan 700 is shown.

[0058] The cross-flow fan 700 includes a housing mechanism 710, a drive mechanism 730, and fan blades 750. Both the drive mechanism 730 and the fan blades 750 are mounted inside the housing mechanism 710. In this embodiment, the thickness direction of the cross-flow fan 700 is the Z-axis direction.

[0059] Specifically, the housing mechanism 710 is provided with a receiving cavity 701, an air inlet 703, an air outlet 705, and a clearance opening. Figure 3 and Figure 4 (Not shown in the image). Both the air inlet 703 and the air outlet 705 are located on the side of the housing mechanism 710 and communicate with the receiving cavity 701, and are spaced apart from each other to ensure that both the air inlet 703 and the air outlet 705 communicate with the inner side of the cross-flow fan 700. Air flows along the air inlet 703 in the direction of air intake (e.g., air intake direction). Figure 4 The direction of the solid arrow (as indicated by the arrow) and the air outlet direction along the air outlet 705 (e.g., Figure 4 The angle between the direction indicated by the dashed arrow is α. In this embodiment, α = 90°, that is, the air inlet direction of the air inlet 703 is perpendicular to the air outlet direction of the air outlet 705. In this embodiment, the clearance opening is provided on the side of the housing mechanism 710, and is spaced apart from both the air inlet 703 and the air outlet 705, and communicates with the receiving cavity 701, so as to realize the communication between the clearance opening and the inner side of the cross-flow fan 700.

[0060] In this embodiment, the housing mechanism 710 includes a first cover 11, a second cover 13, and a side wall 15. The first cover 11 and the second cover 13 are spaced apart and arranged opposite to each other along the thickness direction of the cross-flow fan 700. The side wall 15 surrounds the periphery of the first cover 11 and connects between the first cover 11 and the second cover 13, forming a receiving cavity 701 with the first cover 11 and the second cover 13.

[0061] The first cover 11 has a slot 101 that penetrates the first cover 11 along its thickness direction. In this embodiment, the first cover 11 is generally plate-shaped. The side of the side baffle 15 has an air inlet 703, an air outlet 705, and a clearance opening, so that the air inlet 703, air outlet 705, and clearance opening are all located on the side of the housing mechanism 710. The air inlet 703, air outlet 705, and clearance opening all penetrate the side baffle 15, so that the air inlet 703, air outlet 705, and clearance opening are all connected to the receiving cavity 701, thereby achieving communication between the air inlet 703, air outlet 705, and clearance opening and the inner side of the housing mechanism 710. In this embodiment, the side baffle 15 includes a first baffle portion 17 and a second baffle portion 19, both of which are installed on the first cover 11 and are spaced apart from each other. The first retaining wall portion 17 includes a first end 171 and a second end 173, which are arranged opposite to each other along the extending direction of the first retaining wall portion 17. The second retaining wall portion 19 includes a third end 191 and a fourth end 193, which are arranged opposite to each other along the extending direction of the second retaining wall portion 19. The first end 171 and the third end 191 are spaced apart along the Y-axis to form an air inlet 703, and the second end 173 and the fourth end 193 are spaced apart along the X-axis to form an air outlet 705. In this embodiment, a clearance opening is provided in the first retaining wall portion 17 and penetrates through the first retaining wall portion 17.

[0062] See Figure 5 , Figure 6 and Figure 7 , Figure 5 for Figure 4 The diagram shows the assembly structure of the drive mechanism 730 and the fan blades 750 in the cross-flow fan 700. Figure 6 for Figure 5 A schematic diagram of the stator component 30 in the drive mechanism 730 of the assembly structure shown. Figure 7 for Figure 5 A schematic diagram of the rotor component 40 in the drive mechanism 730 of the assembly structure shown.

[0063] The drive mechanism 730 includes a stator 30, a rotor 40, and a bearing 50. Along the thickness direction of the cross-flow fan 700, the rotor 40 is mounted on one side of the stator 30, and the bearing 50 is mounted between the stator 30 and the rotor 40. The rotor 40 can rotate relative to the stator 30 about the center line of the bearing 50 under the drive of the stator 30. Specifically, the rotor 40 rotates relative to the stator 30 about the rotation axis L. In this embodiment, the direction of the line containing the rotation axis L is the Z-axis direction, and the rotation axis L coincides with the center line of the bearing 50.

[0064] Specifically, the stator component 30 includes a first circuit board 31 and a coil winding 33. The first circuit board 31 is provided with a mounting groove 311, which extends through the first circuit board 31 along its thickness direction. For example, in this embodiment, the first circuit board 31 is generally circular, the mounting groove 311 is generally circular, and the mounting groove 311 is located at the center of the circular first circuit board 31.

[0065] A coil winding 33 is disposed on and electrically connected to the first circuit board 31. Multiple coil windings 33 may be present, arranged at intervals around the axis of rotation L. In this embodiment, multiple coil windings 33 are arranged around the opening of the mounting slot 311, and are spaced apart from each other. For example, a multi-turn conductive layer can be etched onto the first circuit board 31, and an insulating resin can be applied to the conductive layer to form multiple insulated and spaced coils, thereby forming a coil winding 33. For example, the conductive layer can be made of copper. In this embodiment, the outer contour of each coil winding 33 is approximately fan-shaped.

[0066] The rotor component 40 includes a mounting housing 41 and a magnet 43. Specifically, the mounting housing 41 includes a first surface 411 and a second surface 413, which are arranged opposite to each other along the thickness direction of the mounting housing 41. The first surface 411 faces the negative Z-axis direction, and the second surface 413 faces the positive Z-axis direction. The mounting housing 41 is provided with a receiving groove 401 and a mounting hole 403. The opening of the receiving groove 401 is located on the first surface 411 of the mounting housing 41, and the receiving groove 401 is recessed from the first surface 411 towards the second surface 413. The opening of the mounting hole 403 is located on the bottom wall of the receiving groove 401, and the mounting hole 403 penetrates the bottom wall of the receiving groove 401.

[0067] In this embodiment, the mounting shell 41 includes a first shell portion 415 and a second shell portion 417, with the first shell portion 415 surrounding the second shell portion 417. Both the first shell portion 415 and the second shell portion 417 include a first surface 411 and a second surface 413. The second shell portion 417 is provided with a receiving groove 401 and a mounting hole 403, and the second shell portion 417 protrudes relative to the first shell portion 415 in a direction away from the opening of the receiving groove 401.

[0068] A magnet 43 is disposed on the first surface 411 of the mounting housing 41 to enable the magnet 43 to be mounted on the mounting housing 41. Multiple magnets 43 may be present, arranged at intervals around the axis of rotation L. In this embodiment, multiple magnets 43 are arranged around the opening of the receiving groove 401, and are spaced apart from each other. In this embodiment, multiple magnets 43 are all disposed on the first surface 411 of the first housing portion 415, and the outer contour of each magnet 43 is approximately fan-shaped. Exemplarily, the magnet 43 is a permanent magnet.

[0069] See also Figure 8 and Figure 9 , Figure 8 for Figure 5 The diagram shows a cross-sectional view of the assembled structure. Figure 9 for Figure 8 The diagram shows the structure of part A in the cross-sectional structure shown.

[0070] The bearing component 50 includes a base 51, a fixing member 53, a shaft core 55, a wear-resistant member 56, a bushing 57, and an anti-detachment member 59. The base 51 has a mounting cavity 511. The base 51 includes a boss 513, which is located on the sidewall of the mounting cavity 511 and protrudes towards the mounting cavity 511. The fixing member 53 is mounted on the base 51 and covers the opening of the mounting cavity 511. The fixing member 53 has a through hole 531, which penetrates the fixing member 53 along its thickness direction and communicates with the mounting cavity 511. Exemplarily, in this embodiment, the fixing member 53 is a retaining ring.

[0071] The shaft core 55 is installed in the mounting cavity 511 of the base 51 and can rotate relative to the base 51. In this embodiment, the center line of the shaft core 55 coincides with the axis of rotation L. The shaft core 55 has a through hole 531 and protrudes from the surface of the fixing member 53 away from the mounting cavity 511. The shaft core 55 is provided with a limiting groove 551, the opening of which is located on the periphery of the shaft core 55. The shaft core 55 includes a first shaft end 553 and a second shaft end 557, which are arranged opposite to each other along the extending direction of the shaft core 55. The first shaft end 553 abuts against the bottom wall of the mounting cavity 511 of the base 51, and the second shaft end 557 protrudes from the surface of the fixing member 53 away from the mounting cavity 511. In this embodiment, the surface of the first shaft end 553 facing the bottom wall of the mounting cavity 511 is convex, which helps to reduce the contact area between the first shaft end 553 and the bottom wall of the mounting cavity 511 of the base 51. This helps to reduce the friction between the shaft core 55 and the base 51 when the shaft core 55 rotates relative to the base 51, thereby helping to increase the rotation speed of the shaft core 55 and increase the service life of the shaft core 55.

[0072] The wear-resistant part 56 is installed in the mounting cavity 511 of the base 51 and between the first shaft end 553 of the shaft core 55 and the bottom wall of the mounting cavity 511 of the base 51, so that the wear-resistant part 56 can be installed between the shaft core 55 and the base 51, which can further reduce the friction between the base 51 and the shaft core 55, thereby helping to improve the service life of the shaft core 55.

[0073] Both the bushing 57 and the anti-detachment component 59 are installed within the mounting cavity 511 of the base 51, and both are sleeved around the periphery of the shaft core 55. At this time, the shaft core 55 is located inside the bushing 57 and can rotate relative to the bushing 57 around the axis L. The bushing 57 is installed on the side of the fixing member 53 facing the bottom wall of the mounting cavity 511 of the base 51. The anti-detachment component 59 abuts against the surface of the boss 513 opposite to the bottom wall of the mounting cavity 511 and the bushing 57, thereby achieving installation of the anti-detachment component 59 between the base 51 and the bushing 57. The anti-detachment component 59 is engaged within the limiting groove 551 of the shaft core 55 to prevent the shaft core 55 from detaching from the base 51 when the shaft core 55 rotates relative to the base 51. In this embodiment, the anti-detachment component 59 is a retaining ring.

[0074] In the assembled drive mechanism 730, the bearing member 50 passes through the mounting groove 311 of the first circuit board 31 in the stator member 30 and is connected to the mounting shell 41 of the rotor member 40. At least a portion of the bearing member 50 is accommodated in the receiving groove 401 of the mounting shell 41 to achieve the installation of the bearing member 50 between the stator member 30 and the rotor member 40. The base 51 of the bearing member 50 passes through the mounting groove 311 and is installed within it to achieve the installation of the bearing member 50 on the first circuit board 31, thereby achieving the connection between the bearing member 50 and the stator member 30. For example, the base 51 and the mounting groove 311 are interference-fitted to achieve the connection between the base 51 and the first circuit board 31. The second shaft end 557 of the shaft core 55 in the bearing member 50 is fixedly connected to the second shell portion 417 of the mounting shell 41 and installed in the mounting hole 403 to achieve a fixed connection between the shaft core 55 and the mounting shell 41, thereby achieving a fixed connection between the bearing member 50 and the rotor member 40. The rotor component 40 can rotate relative to the stator component 30 around the center line of the shaft core 55.

[0075] At this time, the first circuit board 31 of the stator component 30 and the mounting shell 41 of the rotor component 40 are spaced apart along the thickness direction of the cross-flow fan 700, that is, spaced apart along the Z-axis direction, so that the mounting shell 41 is mounted on one side of the first circuit board 31 along the thickness direction of the cross-flow fan 700. Multiple coil windings 33 are located on the side of the first circuit board 31 facing the mounting shell 41. The first surface 411 of the mounting shell 41 faces the first circuit board 31, so that multiple magnets 43 located on the first surface 411 are located on the side of the mounting shell 41 facing the first circuit board 31, with each magnet 43 opposite and spaced apart from one coil winding 33.

[0076] See also Figure 5 , Figure 8 and Figure 10 , Figure 10 for Figure 5 The diagram shows a top view of the assembled structure.

[0077] The fan blade 750 is mounted on the second surface 413 of the first shell portion 415 in the mounting housing 41 of the rotor component 40, so that the fan blade 750 is located on the side of the mounting housing 41 away from the magnet 43, thereby realizing that the fan blade 750 is located on the rotor component 40 and on the side of the rotor component 40 away from the stator component 30, thus realizing that the fan blade 750 is mounted on the drive mechanism 730. The fan blade 750 includes a plurality of blades 60, which are spaced apart along the circumferential direction of the mounting housing 41. In this embodiment, the plurality of blades 60 are spaced apart around the rotation axis L, that is, spaced apart around the bearing component 50. Adjacent two blades 60 form a flow channel 61, and the plurality of blades 60 form a plurality of flow channels 61, which are used for air circulation.

[0078] In this embodiment, the outer diameter of the fan blade 750 is R, and the inner diameter of the fan blade 750 is r, where r = (0.8~0.86)*R. The inner circumferential blade angle of the blade 60 is β1, where β1 is 90°~97°. The outer circumferential blade angle of the blade 60 is β2, where β2 is 130°~168°. The number of blades 60 is N, where N = 3.14*R / t, and t takes a value of 0.94~1.0.

[0079] See also Figure 3 , Figure 11 and Figure 12 , Figure 11 for Figure 3 The cross-sectional structure diagram of the cross-flow fan 700 shown is as follows. Figure 12 for Figure 3 A side view of the cross-sectional structure of the cross-flow fan 700 shown.

[0080] In the assembled cross-flow fan 700, both the fan blades 750 and the drive mechanism 730 are mounted in the receiving cavity 701 of the housing mechanism 710, so that both the fan blades 750 and the drive mechanism 730 are mounted inside the housing mechanism 710. The first circuit board 31 of the stator component 30 in the drive mechanism 730 is mounted on the first cover 11, and at least a portion of the first circuit board 31 is exposed relative to the slot 101 of the first cover 11, so that the housing mechanism 710 can dissipate heat from the first circuit board 31. The fan blades 750 face the second cover 13 and are spaced apart from the second cover 13 along the thickness direction of the cross-flow fan 700. The flow channel 61 of the fan blades 750 communicates with the receiving cavity 701 of the housing mechanism 710. Multiple blades 60 of the fan blades 750 are arranged around the centerline of the shaft core 55 of the bearing component 50 in the drive mechanism 730.

[0081] When the cross-flow fan 700 is working, the first circuit board 31 in the stator component 30 of the drive mechanism 730 supplies power to the coil winding 33. The coil winding 33 is energized and generates an axial magnetic field parallel to the rotation axis L. This axial magnetic field passes through the magnet 43, causing a Lorentz force between the coil winding 33 and the magnet 43, which drives the magnet 43 to rotate relative to the first circuit board 31, thereby causing the mounting housing 41 to rotate. The rotation of the mounting housing 41 also causes the shaft core 55 of the bearing component 50 to rotate relative to the base 51, thus realizing that the stator component 30 drives the rotor component 40 to rotate relative to the stator component 30 around the center line of the shaft core 55. At this time, the rotation of the mounting housing 41 also causes the fan blades 750 to rotate around the center line of the shaft core 55. The multiple blades 60 of the fan blades 750 rotate and drive the airflow, thereby forming an airflow direction from the air inlet 703, through the flow channel 61 of the fan blades 750, and out of the air outlet 705, thereby achieving the effect of heat dissipation.

[0082] Traditional cross-flow fans, due to their larger placement space, employ an external motor design, meaning the motor is not housed within the fan blade's airflow path. However, for electronic devices, internal space is limited, leaving less room for the fan. If a traditional cross-flow fan has an external motor, the height of the fan blades that can be allocated to the electronic components decreases, thus reducing the fan's airflow. Furthermore, if an existing centrifugal fan motor architecture is used, the motor must be placed inside the fan blade's airflow path, which also impacts the cross-flow fan's performance.

[0083] To address the aforementioned technical problems, this application provides a cross-flow fan 700. The stator 30 of a drive mechanism 730 drives the rotor 40 to rotate. The rotation of the rotor 40 drives the fan blades 750 to rotate, which in turn causes airflow, thereby achieving the cooling effect of the cross-flow fan 700. Furthermore, the cross-flow fan 700 provided in this application embodiment achieves a side-intake, side-exhaust cooling effect by providing an air inlet 703 and an air outlet 705 on the side of the housing mechanism 710. This facilitates the side-intake, side-exhaust cooling effect of the electronic device 1 assembled with the cross-flow fan 700. Additionally, by placing the drive mechanism 730 within the housing cavity 701 of the housing mechanism 710, the problem of reduced airflow caused by externally mounted motors in existing cross-flow fans is avoided. On the other hand, by setting the fan blade 750 on the side of the rotor 40 away from the stator 30, both the stator 30 and the rotor 40 of the drive mechanism 730 are arranged at the bottom of the fan blade 750. This ensures that the drive mechanism 730 does not occupy the space of the flow channel 61 inside the fan blade 750, and there are no protrusions formed by the motor in the flow channel 61 of the fan blade 750. This avoids the problem of forming a large-diameter protrusion in the flow channel 61 inside the fan blade 750, keeps the flow channel 61 of the fan blade 750 unobstructed, ensures the flow characteristics of the cross-flow fan 700, and helps to improve the air volume of the cross-flow fan 700, thereby improving the heat dissipation effect of the cross-flow fan 700 on the heat-generating devices in the electronic device 1.

[0084] Furthermore, by providing a receiving groove 401 on the side of the mounting housing 41 facing the first circuit board 31 to accommodate at least a portion of the bearing member 50, it is advantageous for the mounting housing 41 and the bearing member 50 to reuse the dimensions of the cross-flow fan 700 along the thickness direction. This facilitates the reduction of the dimensions of the drive mechanism 730 along the thickness direction of the cross-flow fan 700. On the one hand, this helps to reduce the size of the cross-flow fan 700. On the other hand, when the thickness dimension of the cross-flow fan 700 is fixed, it can increase the space of the flow channel 61 of the fan blade 750, thereby improving the air volume of the cross-flow fan 700.

[0085] This application also studies and compares the performance of the cross-flow fan 700 with that of a conventional cross-flow fan using a conventional external motor, and the results are shown in Table 2. The only difference between the conventional cross-flow fan and the cross-flow fan 700 of this embodiment is the different drive mechanism.

[0086] Table 2 Performance of conventional cross-flow fans and cross-flow fan 700 of this embodiment

[0087]

[0088] As can be seen from Table 2, compared with traditional cross-flow fans, the drive mechanism 730 in the cross-flow fan 700 of this application embodiment does not occupy the flow channel 61 of the fan blade 750, thereby increasing the maximum airflow of the cross-flow fan 700. Experimental results show that the cross-flow fan 700 provided in this application embodiment, by installing the stator 30 and rotor 40 of the drive mechanism 730 at the bottom of the fan blade 750, can achieve the goal of not occupying the flow channel 61 of the fan blade 750, thereby facilitating the increase of the airflow of the cross-flow fan 700.

[0089] See Figure 13 , Figure 13 This is an exploded structural diagram of the cross-flow fan 700 provided in the second embodiment of this application. Figure 13 The second cover 13 is not shown in the figure.

[0090] The cross-flow fan 700 provided in the second embodiment differs from the cross-flow fan 700 in the first embodiment in that the air inlet 703 of the housing mechanism 710 in the second embodiment has an air inlet direction parallel to the air outlet 705.

[0091] Specifically, in the cross-flow fan 700 of the second embodiment, the first baffle portion 17 and the second baffle portion 19 of the side baffle 15 are spaced apart along the Y-axis. The first end 171 of the first baffle portion 17 and the third end 191 of the second baffle portion 19 form an air inlet 703 spaced apart along the Y-axis, with the air intake direction of the air inlet 703 being the positive X-axis direction. The second end 173 of the first baffle portion 17 and the fourth end 193 of the second baffle portion 19 form an air outlet 705 spaced apart along the Y-axis, with the air outlet 705 exiting in the positive X-axis direction. At this time, the angle α between the air outlet 705 and the air inlet 703 is 0°.

[0092] It is understood that the cross-flow fan 700 of the second embodiment can be applied to electronic devices 1 where the air inlet and outlet directions are required to be consistent. It is also understood that those skilled in the art can flexibly adjust the positions of the air inlet 703 and the air outlet 705 on the side baffle 15 in the housing mechanism 710 according to the actual needs of the electronic device 1, thereby flexibly adjusting the air inlet direction of the air inlet 703 and the air outlet direction of the air outlet 705. This application does not impose any limitations on this. For example, in some other embodiments, the included angle α between the air inlet direction of the air inlet 703 and the air outlet direction of the air outlet 705 can satisfy: 0°≤α≤180°.

[0093] See Figure 14 , Figure 15 and Figure 16 , Figure 14 This is a schematic cross-sectional view of the cross-flow fan 700 provided in the third embodiment of this application. Figure 15 for Figure 14 The diagram shows a top view of the stator component 30 in the cross-flow fan 700. Figure 16 for Figure 14 The schematic diagram of the rotor component 40 in the cross-flow fan 700 is shown from below.

[0094] The cross-flow fan 700 of the third embodiment differs from the cross-flow fan 700 of the first embodiment in that the positions of the coil winding 33 and the magnet 43 are different from those of the cross-flow fan 700 of the first embodiment.

[0095] Specifically, in the drive mechanism 730 of the cross-flow fan 700 of the third embodiment, the stator component 30 includes a first circuit board 31 and a magnet 43, and the rotor component 40 includes a mounting housing 41 and a coil winding 33. In the assembled cross-flow fan 700, the mounting housing 41 is mounted on one side of the first circuit board 31 along the thickness direction of the cross-flow fan 700. The magnet 43 is disposed on the side of the first circuit board 31 facing the mounting housing 41. The coil 33 is disposed on the first surface 411 of the mounting housing 41, so that the coil 33 is disposed on the side of the mounting housing 41 facing the first circuit board 31.

[0096] In this embodiment, the drive mechanism 730 further includes a conductive track 35, which is disposed on the first circuit board 31 and protrudes towards the mounting housing 41. In this embodiment, the conductive track 35 has a ring-shaped structure and is arranged around the outside of the plurality of magnets 43. In this embodiment, the conductive track 35 is electrically connected to the first circuit board 31 and in electrical contact with the coil winding 33 disposed on the mounting housing 41, so as to realize the electrical connection between the first circuit board 31 and the coil winding 33, thereby realizing the electrical connection between the first circuit board 31 and the coil winding 33, and thus enabling the first circuit board 31 to supply power to the coil winding 33 through the conductive track 35. It is understood that the conductive track 35 can also be disposed on the mounting housing 41 and protrude toward the first circuit board 31. The conductive track 35 is electrically connected to the coil winding 33 and electrically contacts the first circuit board 31, so as to realize the electrical connection between the first circuit board 31 and the coil winding 33, thereby realizing the electrical connection between the first circuit board 31 and the coil winding 33, and thus realizing the first circuit board 31 supplying power to the coil winding 33 through the conductive track 35. In addition, the bearing component 50 in the drive mechanism 730 of the cross-flow fan 700 in the third embodiment is the same as the bearing component 50 in the first embodiment, and will not be described again here.

[0097] When the cross-flow fan 700 of the third embodiment is working, the first circuit board 31 supplies power to the coil winding 33 through the conductive rail 35. The coil winding 33 generates an axial magnetic field parallel to the rotation axis L. This axial magnetic field passes through the magnet 43 provided on the first circuit board 31, causing a Lorentz force between the coil winding 33 and the magnet 43, which drives the coil winding 33 to rotate relative to the first circuit board 31, thereby causing the mounting housing 41 to rotate. The rotation of the mounting housing 41 also causes the shaft core 55 of the bearing 50 to rotate relative to the base 51, thereby realizing that the stator 30 drives the rotor 40 to rotate relative to the stator 30 around the center line of the shaft core 55. At this time, the rotation of the mounting housing 41 also causes the fan blades 750 to rotate around the shaft core 55. The multiple blades 60 of the fan blades 750 rotate and drive the airflow, thereby forming an airflow direction from the air inlet 703, through the flow channel 61 of the fan blades 750, and out of the air outlet 705, thus achieving the effect of heat dissipation.

[0098] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments and equivalent variations made in accordance with the claims of this application are still within the scope of this application.

Claims

1. A cross-flow fan, characterized in that, The cross-flow fan includes: The housing mechanism has a receiving cavity, an air inlet and an air outlet. The air inlet and the air outlet are both located on the side of the housing mechanism and are connected to the receiving cavity, and are spaced apart from each other. A drive mechanism is installed in the receiving cavity. The drive mechanism includes a rotor and a stator. Along the thickness direction of the cross-flow fan, the rotor is installed on one side of the stator and can rotate relative to the stator under the drive of the stator. And fan blades, the fan blades being installed in the receiving cavity, the fan blades being disposed on the rotor component and located on the side of the rotor component opposite to the stator component.

2. The cross-flow fan according to claim 1, characterized in that, The stator component includes a first circuit board and a coil winding, and the rotor component includes a mounting shell and a magnet. Along the thickness direction of the cross-flow fan, the mounting shell is mounted on one side of the first circuit board, the coil winding is located on the side of the first circuit board facing the mounting shell, the magnet is located on the side of the mounting shell facing the first circuit board and is opposite to the coil winding, and the fan blades are located on the side of the mounting shell away from the magnet.

3. The cross-flow fan according to claim 1, characterized in that, The stator component includes a first circuit board and a magnet, and the rotor component includes a mounting shell and a coil winding. Along the thickness direction of the cross-flow fan, the mounting shell is mounted on one side of the first circuit board, the magnet is located on the side of the first circuit board facing the mounting shell, the coil winding is located on the side of the mounting shell facing the first circuit board and is arranged opposite to the magnet, and the fan blades are located on the side of the mounting shell away from the magnet. The driving mechanism further includes a conductive track, which is disposed on the first circuit board and protrudes toward the mounting housing, and is electrically connected between the first circuit board and the coil winding; or the conductive track is disposed on the mounting housing and protrudes toward the first circuit board, and is electrically connected between the first circuit board and the coil winding.

4. The cross-flow fan according to claim 2 or 3, characterized in that, There are multiple coil windings, which are spaced apart from each other. There are multiple magnets, which are also spaced apart from each other. Each magnet is positioned opposite to one of the coil windings.

5. The cross-flow fan according to claim 2 or 3, characterized in that, The first circuit board is provided with a mounting groove that extends through the first circuit board along its thickness direction. The mounting shell is provided with a receiving groove with an opening on the surface of the mounting shell facing the first circuit board. The driving mechanism further includes a bearing component that passes through the mounting groove and at least a portion of the bearing component is received within the receiving groove. The mounting shell is mounted on the bearing component and is rotatable relative to the first circuit board around the bearing component.

6. The cross-flow fan according to claim 5, characterized in that, The mounting housing includes a first housing portion and a second housing portion. The first housing portion is disposed around the second housing portion. The opening of the receiving groove is located on the surface of the second housing portion facing the first circuit board, and the bottom wall of the receiving groove protrudes relative to the first housing portion in a direction away from the first circuit board.

7. The cross-flow fan according to claim 2 or 3, characterized in that, The housing mechanism includes a first cover, a second cover, and a side wall. The first cover and the second cover are spaced apart and opposite to each other along the thickness direction of the cross-flow fan. The side wall is connected between the first cover and the second cover. The side wall is provided with the air inlet and the air outlet. The first cover is provided with a slot that penetrates the first cover along the thickness direction, and at least a portion of the first circuit board is exposed relative to the slot.

8. The cross-flow fan according to claim 2 or 3, characterized in that, The fan blade includes multiple blades, which are spaced apart along the circumferential direction of the mounting housing.

9. The cross-flow fan according to any one of claims 1 to 3, characterized in that, The drive mechanism further includes a bearing component, which includes a base, a bushing, and a shaft core. The bushing is mounted on the base, and the shaft core is located inside the bushing and can rotate relative to the bushing. The rotor component is fixedly connected to the shaft core and rotates relative to the stator component around the center line of the shaft core.

10. An electronic device, characterized in that, It includes a heat-generating device and a cross-flow fan as described in any one of claims 1 to 9, the cross-flow fan being used to dissipate heat from the heat-generating device.

11. The electronic device according to claim 10, characterized in that, The electronic device further includes a housing, which has an accommodating space, a first opening, and a second opening. The first opening and the second opening are both located on the side of the housing and are connected to the accommodating space. The heating device and the cross-flow fan are both installed in the accommodating space. The air inlet is opposite to the first opening, and the air outlet is opposite to the second opening.

12. The electronic device according to claim 11, characterized in that, The housing mechanism is also provided with a clearance opening, which communicates with the receiving cavity. The electronic device also includes an electrical connector and a second circuit board. The electrical connector and the second circuit board are both installed in the receiving space. The electrical connector passes through the clearance opening and is electrically connected between the stator and the second circuit board.

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