Heat dissipation device, centrifugal fan and vehicle

Abstract

The invention provides a heat dissipation device, a centrifugal fan and a vehicle. The heat dissipation device can be a vehicle-mounted wireless charging device for example. The heat dissipation device comprises a centrifugal fan (220) provided with a fan air outlet (223); the air guide pipeline (230) is provided with a pipeline air inlet (231) and a pipeline air outlet (232), the pipeline air inlet (231) is in butt joint with the fan air outlet (223), the air guide pipeline (230) is used for deflecting airflow from the fan air outlet (223) by an angle alpha and then discharging the airflow from the pipeline air outlet (232) so as to dissipate heat of a heating piece (240), and alpha is larger than 0 and smaller than or equal to 90 degrees. By improving the structure of the heat dissipation device, the problem that the use experience of consumers is affected due to the fact that the heat dissipation device cannot give consideration to heat dissipation efficiency and low-noise operation at the same time can be solved.

Description

Heat dissipation device, centrifugal fan and vehicle

[0001] The present application claims priority to the Chinese patent application No. 202421460349.9, filed on June 24, 2024, and entitled "Heat dissipation device, centrifugal fan and vehicle", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of ventilation and heat dissipation, in particular to a heat dissipation device, a centrifugal fan and a vehicle. BACKGROUND

[0003] With the gradual development of wireless charging technology, more and more electronic devices (such as mobile phones) have wireless charging function. As a daily charging scene, vehicles also begin to be equipped with vehicle-mounted wireless charging devices to meet the charging needs of users when riding vehicles.

[0004] In the process of wireless charging, a part of electric energy will be converted into heat, which will cause the temperature of the charged electronic device to rise, affecting the stability and safety of the electronic device. Therefore, a centrifugal fan is usually configured in a vehicle-mounted wireless charging device with large power to cool and heat the charged electronic device.

[0005] In order to meet the heat dissipation requirement, the centrifugal fan usually needs to run at a high speed, which will cause a large operating noise. For the above reasons, the vehicle-mounted wireless charging device in the prior art is difficult to balance high-efficiency heat dissipation and low-noise operation, affecting the user experience.

[0006] SUMMARY

[0007] The present application provides a heat dissipation device, a centrifugal fan and a vehicle. The heat dissipation device may be a vehicle-mounted wireless charging device. The present application improves the structure of the heat dissipation device, and solves the problem that the heat dissipation device cannot balance heat dissipation efficiency and low-noise operation, affecting the user experience.

[0008] In a first aspect, a heat dissipation device is provided, comprising: a centrifugal fan having a fan air outlet; and a guide duct having a duct air inlet and a duct air outlet, the duct air inlet being connected to the fan air outlet, the guide duct being configured to deflect an airflow from the fan air outlet by an angle α and discharge the airflow from the duct air outlet to dissipate heat from a heat generating component, wherein 0 < α ≤ 90°.

[0009] The heat dissipation device provided by the embodiments of the present application adjusts the layout position of the centrifugal fan and adaptively adjusts the structure of the air guide pipeline, so that the deflection angle of the airflow in the air guide pipeline is less than 90 degrees. Since the deflection angle of the airflow is small, the flow loss is also small. Therefore, the centrifugal fan does not need to run at a high speed to meet the heat dissipation requirement of the heat generating component, and the running noise of the centrifugal fan is also small. In addition, the reduction of the airflow deflection angle can also inhibit the generation of vortex, improve the uniformity of airflow flow, and reduce the airflow noise in the air duct. That is, the embodiments of the present application can balance the heat dissipation efficiency and the running noise, reduce the noise under the premise of ensuring the air volume, so that the heat dissipation device can realize high-efficiency heat dissipation and low-noise operation at the same time, and improve the user experience.

[0010] In some examples, the value of a can be 12°, 20°, 30°, 45°, 50°, 60°, 68°, 70°, 80°, or 87°, but is not limited thereto.

[0011] In some examples, the air guide pipeline can be any air guide structure capable of deflecting the airflow direction by an angle a, and the specific form of the air guide pipeline is not specially limited in the present application. For example, the air guide pipeline can be composed of one or more pipe segments, which can be straight pipes or curved pipes (for example, pipes with an arc). For example, the air guide pipeline can be a curved pipe segment with an arc, or the air guide segment can be sequentially connected by multiple pipe segments, at least one of which can be a straight pipe segment or a curved pipe segment, and the cross-sectional areas of different pipe segments can be the same or different.

[0012] In a possible implementation, the air guide pipeline includes a first straight pipe segment and a second straight pipe segment connected to each other, the first straight pipe segment constitutes the pipeline air inlet away from the port of the second straight pipe segment, the second straight pipe segment constitutes the pipeline air outlet away from the port of the first straight pipe segment, the center line of the first straight pipe segment is parallel to the air outlet direction of the centrifugal fan, and the included angle between the center line of the first straight pipe segment and the center line of the second straight pipe segment is β, β = 180°-a.

[0013] By setting the center line of the first straight pipe segment parallel to the air outlet direction of the centrifugal fan, the airflow from the centrifugal fan can smoothly enter the first straight pipe segment, the first straight pipe segment does not deflect the airflow flow direction, and thus does not additionally cause flow loss and vortex noise. The included angle between the center line of the first straight pipe segment and the center line of the second straight pipe segment is β, so that the airflow can be deflected by an angle a after a single deflection (turning).

[0014] Through the above setting, the degree of disorder in the flow channel can be weakened, the flow loss is reduced, the airflow flow uniformity is improved, the wind increasing and noise reducing effect is further realized, while ensuring the reliable heat dissipation effect on the heating element, the system noise can be maintained in a more reasonable (for example, not easy to be perceived by the user) range, and the user experience is further improved. In addition, under the premise that the position of the pipeline air outlet is relatively fixed (because the position of the heating element is relatively fixed), the above structure of the air guide pipeline is also beneficial to arranging the centrifugal fan at a suitable position without being easily interfered by other objects such as a small refrigerator, a storage cabinet and the like in the vehicle, thereby facilitating the layout design of the vehicle interior.

[0015] In some examples, the cross-sectional shape of the first straight pipe section and the second straight pipe section is rectangular, and the cross-sectional area of the first straight pipe section is smaller than that of the second straight pipe section. In other examples, the cross-sectional shape of the first straight pipe section and the second straight pipe section can also be circular or elliptical or other shapes, and the cross-sectional shape / area of the first straight pipe section and the second straight pipe section can be the same or different, which is not limited in the present application.

[0016] In a possible implementation, the first straight pipe section and the second straight pipe section are connected with an arc-shaped air guide plate.

[0017] By arranging the arc-shaped air guide plate, the first straight pipe section and the second straight pipe section can be smoothly connected, so that when the flow direction of the airflow is angularly deflected, the degree of disorder in the flow channel can be further weakened, the flow loss is reduced, the airflow flow uniformity is improved, the flow noise is reduced, the wind increasing and noise reducing effect is further realized, and the user experience is improved.

[0018] In a possible implementation, the area of the pipeline air outlet is smaller than that of the pipeline air inlet.

[0019] Through the above setting, the pressure difference between the flow channel background pressure and the external air pressure can be increased, and the air blowing capacity of the centrifugal fan is further enhanced, thereby facilitating to improve the heat dissipation performance of the heating element.

[0020] In a possible implementation, the fan air outlet and the pipeline air inlet are of the same shape and equal size.

[0021] Through the above setting, the fan air outlet and the pipeline air inlet can be smoothly connected, avoiding the flow loss and vortex noise caused by the sudden increase or decrease of the area of the airflow at the junction of the centrifugal fan and the air guide pipeline, and further realizing the wind increasing and noise reducing effect.

[0022] In a possible implementation, the centrifugal fan includes a volute, the fan air outlet is located on the volute, and the air guide pipeline and the volute form an integral structure through an integral molding process.

[0023] Through the above arrangement, the air guide pipe and the volute are connected as a whole without the need for additional physical connection means such as screwing or clamping, which not only improves the connection reliability of the air guide pipe and the volute, but also facilitates the simplification of the production process and the improvement of the production efficiency. In addition, by arranging the above two as an integrated structure, it is also beneficial to reduce vibration and noise, and further achieve the effect of increasing wind and reducing noise.

[0024] In some examples, the integrated structure can be a plastic part or a metal part, and the integrated forming process can be, for example, an injection molding process or 3D printing, and can also be casting or forging, etc. The present application does not make special limitations on this.

[0025] In a possible implementation, the heat dissipation device is a wireless charging device, and the heat generating part is an electronic device that is wirelessly charged by the wireless charging device. For example, the wireless charging device can be a vehicle-mounted wireless charging device, or a wireless charging device used in other scenarios (such as in a home), and the present application does not make special limitations on this.

[0026] In some examples, the wireless charging device can be a vehicle-mounted wireless charging device, which can be installed in a central storage box, an armrest box, or the like. The user can place the electronic device on the wireless charging device to charge the electronic device. For example, the wireless charging device can automatically sense the placement position of the electronic device, and can automatically trigger the charging coil to charge the electronic device when the placement position is correct.

[0027] In some examples, the wireless charging device has multiple charging gears. According to the different charging power of the electronic device, the wireless charging device can select a corresponding charging gear to wirelessly charge the electronic device. In addition, the wireless charging device can simultaneously wirelessly charge one, two, or more electronic devices.

[0028] In some examples, the electronic device can be a mobile terminal device with a wireless charging function, such as a mobile phone, a tablet computer, a smart watch, a smart bracelet, or the like.

[0029] In a possible implementation, the electronic device is carried on a carrying surface of the wireless charging device, a gap is formed between the carrying surface and the electronic device, and the pipe air outlet is in communication with the gap.

[0030] In some examples, the wireless charging device includes a housing, a charging module is installed in the housing, and one outer surface (for example, the top surface) of the housing constitutes the carrying surface.

[0031] The bearing surface is used for bearing or placing electronic devices. In a possible charging scenario, when a wireless charging device is needed to be used to wirelessly charge an electronic device, a user can place the electronic device on the bearing surface, the charging module automatically senses the placement position of the electronic device, and if the placement position is correct, the charging module can trigger to charge the electronic device.

[0032] In some examples, the specific structure of the charging module is not limited, for example, the charging module can include a circuit board, which can be a printed circuit board assembly (PCBA) board or the like, and a plurality of electronic elements are mounted on the circuit board. The types of electronic elements are not limited, for example, can include charging coils, capacitors, inductors, chips, drivers, voltage reduction circuits, shielding layers, etc. In addition to the charging module, the housing can also include a battery system, a support fixing member, and other components, which are not limited by the embodiments of the present application. For example, the air guide pipe is also located in the housing, which is used to guide the airflow from the centrifugal fan to the electronic device to achieve the heat dissipation and cooling of the electronic device.

[0033] In a possible implementation, the bearing surface is provided with a groove to form the gap, and a ventilation opening is formed in the groove wall of the groove, and the air outlet of the air guide pipe is connected with the gap through the ventilation opening.

[0034] In some examples, the groove has a U-shaped groove wall, and a ventilation opening is formed in the bottom wall opposite to the opening of the U-shaped groove wall, and the air guide pipe is connected with the ventilation opening, so that the airflow from the centrifugal fan can enter the gap through the air guide pipe and the ventilation opening in sequence. The airflow flows from the bottom wall of the U-shaped groove wall to the opening direction, which is also the length direction of the electronic device, and the airflow is discharged from the gap after completing the sufficient convection heat exchange with the back surface of the electronic device.

[0035] In some examples, the bearing surface is provided with two grooves, which can place two electronic devices, and each groove corresponds to one electronic device, that is, the wireless charging device can simultaneously wirelessly charge two electronic devices. At this time, each groove is respectively provided with a ventilation opening, and the centrifugal fan and the air guide pipe are also respectively provided with two. The two centrifugal fans are respectively connected with one groove (ventilation opening) through one air guide pipe, and can ventilate and cool the electronic device in the corresponding groove. In other examples, considering the space saving and other factors, the bearing surface can also have only one groove, and the bearing surface can only place one electronic device, that is, the wireless charging device can only wirelessly charge one electronic device at a certain moment. At this time, the centrifugal fan and the air guide pipe only need to be correspondingly provided with one.

[0036] In a possible implementation, 30°≤α≤60°. For example, the value of α can be 35°, 40°, 48°, 52°, 56°, or 58°, but is not limited thereto.

[0037] With the above arrangement, the balance between heat dissipation efficiency and operating noise can be further achieved. While ensuring reliable heat dissipation effect on the electronic device, the system noise can be maintained within a more reasonable range (e.g., not easily perceived by the user), further improving the user experience. In addition, under the premise that the position of the pipe air outlet is relatively fixed (because the position of the electronic device is relatively fixed), the above angle selection is also conducive to arranging the centrifugal fan at a suitable position without interfering with other items such as the in-vehicle refrigerator, storage cabinet, and the like, thereby facilitating the layout design of the vehicle interior.

[0038] In a possible implementation, the heat dissipation device comprises the heat generating component.

[0039] In some examples, the heat dissipation device can be any electronic device (e.g., a notebook computer) that is spatially limited and needs heat dissipation. The heat generating component may, for example, include various electronic devices such as a chip, a chip control board (e.g., a motherboard), a graphics card, a processor, a controller (control board), an integrated circuit, a transistor, or the like, but is not limited thereto.

[0040] In a possible implementation, the heat dissipation device further comprises a heat dissipation fin in thermal connection with the heat generating component, and the airflow discharged from the pipe air outlet is used to dissipate heat from the heat dissipation fin.

[0041] With the above arrangement, the airflow from the pipe air outlet can flow through the surface of the heat dissipation fin, and the heat dissipation fin is in thermal connection with the heat generating component, thereby indirectly achieving heat dissipation and cooling of the heat generating component. The above arrangement has the advantage that the positions of the centrifugal fan and the air guide pipe can be flexibly selected, thereby facilitating the layout design of the heat dissipation device and reducing the design difficulty of the heat dissipation device.

[0042] In some examples, the heat dissipation device further comprises a heat conducting component arranged between the heat generating component and the heat dissipation fin. The heat generated by the heat generating component can be conducted to the heat dissipation fin through the heat conducting component, i.e., the heat dissipation fin is in thermal connection with the heat generating component through the heat conducting component. For example, the heat conducting component comprises thermal grease.

[0043] In some examples, a packaging shell is further arranged between the heat dissipation fin and the heat conducting component. The packaging shell is arranged to package, fix, and protect the heat conducting component and the heat generating component. The packaging shell should not hinder the heat transfer between the heat dissipation fin and the heat conducting component, and therefore the packaging shell can be made of a high-thermal-conductivity material, e.g., the packaging shell can be a metal shell.

[0044] In a possible implementation, the centrifugal fan comprises: a hub; a plurality of blades distributed at intervals on the outer periphery of the hub; and a silencer ring surrounding the outer periphery of the hub and sequentially connected with the plurality of blades, wherein, in the radial direction of the hub, the blade length of the blade is L, the distance between the silencer ring and the hub is D, and 0 < D / L < 1. For example, 0.1, 0.2, 0.3, 0.4, 0.48, 0.50, 0.60, 0.8, or 0.9, but the present application is not limited thereto.

[0045] The present application offsets the silencer ring radially inward, that is, the silencer ring is designed to be radially inwardly retracted (the radius of the silencer ring is reduced), so that the silencer ring is connected with the blades at the radial middle position. In this way, the silencer ring can weaken the obstruction to the high-speed area of the blade trailing edge airflow (improve the air supply efficiency), and at the same time, the intensity of the sound source term of the blade gap is weakened, achieving the effect of increasing the wind and reducing the noise. In addition, the silencer ring can better support the blades, further improve the overall strength of the impeller, and avoid the phenomenon of blade shaking or blade collision during rotation of the impeller.

[0046] In a possible implementation, 0.3 ≤ D / L ≤ 0.7. For example, the value of D / L can be 0.35, 0.4, 0.48, 0.50, 0.53, 0.60, 0.63, or 0.67, but the present application is not limited thereto. Through the above selection, better wind increasing and noise reducing effects can be obtained, and the overall strength of the impeller can be further improved.

[0047] In a possible implementation, the centrifugal fan has a first fan air inlet opposite to the top end surface of the hub, and in the axial direction of the hub, the blade width of the blade is W, the distance between the silencer ring and the blade edge adjacent to the side of the blade near the first fan air inlet is d, and 0 < d / W ≤ 1. For example, the value of d / W can be 0.1, 0.2, 0.3, 0.35, 0.45, 0.5, 0.6, 0.73, 0.82, or 0.9, but the present application is not limited thereto.

[0048] The present application offsets the silencer ring axially away from the first fan air inlet (main air inlet), so that the silencer ring can weaken the obstruction to the high-speed area of the blade trailing edge airflow (improve the air supply efficiency), and at the same time, the intensity of the sound source term of the blade gap is weakened, achieving the effect of increasing the wind and reducing the noise.

[0049] In some examples, the value of d / W can be 1. At this time, the silencer ring is arranged on the outer wall (end surface) of the blade edge away from the first fan air inlet.

[0050] In a possible implementation, 0.3≤d / W≤0.7. For example, the value of d / W can be 0.35, 0.4, 0.45, 0.5, 0.55, or 0.65, etc.

[0051] The embodiment of the present application can reduce the hindering effect of the silence ring on the high-speed region of the airflow at the trailing edge of the blade (improve the air supply efficiency), and weaken the sound source term intensity of the blade gap, thereby achieving the effect of increasing the air flow and reducing the noise. In addition, the airflow from the first fan inlet and the second fan inlet (if any) is not easily hindered by the silence ring. In addition, the silence ring can better support the blade, further improve the overall strength of the impeller, and avoid the phenomenon of blade shaking or blade collision during rotation.

[0052] The embodiment of the present application can reduce the hindering effect of the silence ring on the high-speed region of the airflow at the trailing edge of the blade (improve the air supply efficiency), and weaken the sound source term intensity of the blade gap, thereby achieving the effect of increasing the air flow and reducing the noise. In addition, the airflow from the first fan inlet and the second fan inlet (if any) is not easily hindered by the silence ring. In addition, the silence ring can better support the blade, further improve the overall strength of the impeller, and avoid the phenomenon of blade shaking or blade collision during rotation.

[0053] In a possible implementation, the centrifugal fan further has a second fan inlet, and the first fan inlet is opposite to the second fan inlet and is distributed on both sides of the hub.

[0054] In some examples, when the centrifugal fan has the first fan inlet and the second fan inlet (i.e., double-sided air inlet), 0

[0055] In a second aspect, a centrifugal fan is provided, including: a hub; a plurality of blades, which are distributed on the outer periphery of the hub; and a silence ring, which surrounds the outer periphery of the hub and is sequentially connected with the plurality of blades, wherein, in the radial direction of the hub, the blade length of the blade is L, the distance between the silence ring and the hub is D, and 0

[0056] In a possible implementation, 0.3≤D / L≤0.7.

[0057] In a possible implementation, the centrifugal fan has a first fan air inlet opposite to a top end surface of the hub, a blade width of the blade is W in an axial direction of the hub, and a distance between the silent ring and a blade edge of the blade adjacent to a side of the first fan air inlet is d, 0 < d / W ≤ 1.

[0058] In a possible implementation, 0.3 ≤ d / W ≤ 0.7.

[0059] In a possible implementation, the centrifugal fan further has a second fan air inlet, the first fan air inlet is opposite to the second fan air inlet and is distributed on two sides of the hub.

[0060] In a third aspect, a vehicle is provided, which includes the heat dissipation device provided in any possible implementation of the first aspect, or includes the centrifugal fan provided in any possible implementation of the second aspect.

[0061] In some examples, the vehicle can be any vehicle such as a car, a train, a bullet train, a high-speed rail, a ship or an airplane, and the like, and the type or form of the vehicle is not limited in the present application.

[0062] In some examples, the vehicle can be a car, for example, the vehicle can be a sedan, a van, a truck, an engineering vehicle, a passenger bus, a pickup truck, a multi-purpose vehicle (MPV) or a sport utility vehicle (SUV), and the like, in addition, the vehicle can be a fuel car, and can also be an electric car or a hydrogen-powered car.

[0063] In some examples, the vehicle can be various types of cars that can be driven to travel by electric power, for example, can be a battery electric vehicle (BEV), a range extended electric vehicle (REEV), a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV), and the like, but is not limited thereto. At this time, the vehicle can be charged in a wired manner (for example, through a charging pile) or in a wireless manner (for example, through a charging / discharging coil).

[0064] In some examples, the vehicle can be a vehicle with partial or full automatic driving function. For example, the vehicle can be of Level 0 (L0) automation, Level 1 (L1) automation, Level 2 (L2) automation, Level 3 (L3) automation, Level 4 (L4) automation, or Level 5 (L5) automation according to the classification standard of the Society of Automotive Engineers (SAE). BRIEF DESCRIPTION OF DRAWINGS

[0065] FIG. 1 is a structural schematic diagram of a vehicle wireless charging device in the prior art.

[0066] FIG. 2 is a schematic diagram of the overall structure of a vehicle according to an embodiment of the present application.

[0067] FIG. 3 is a structural schematic diagram of a wireless charging device according to an embodiment of the present application.

[0068] FIG. 4 is an exploded view of a wireless charging device according to an embodiment of the present application.

[0069] FIG. 5 is a connection structure diagram of a wind guide pipe and a centrifugal fan.

[0070] FIG. 6 is a schematic diagram of the principle of angle deflection of air flow by a wind guide pipe.

[0071] FIG. 7 is a connection structure diagram of a wind guide pipe and a volute.

[0072] FIG. 8 is a structural schematic diagram of an impeller.

[0073] FIG. 9 is a schematic diagram of the setting position of a sound muffling ring.

[0074] FIG. 10 is a schematic diagram of the setting position of a sound muffling ring.

[0075] FIG. 11 is a structural schematic diagram of a heat dissipation device according to an embodiment of the present application.

[0076] 10, on-vehicle wireless charging device; 11, housing; 12, centrifugal fan; 13, air guide duct; 14, charging coil; 15, bearing surface; 20, electronic device; 21, power receiving coil; 100, vehicle; 110, vehicle body; 111, chassis; 120, battery pack; 130, wheel; 200, wireless charging device; 210, housing; 211, top cover; 212, base; 213, bearing surface; 214, groove; 215, ventilation opening; 220, centrifugal fan; 221, first fan air inlet; 222, second fan air inlet; 223, fan air outlet; 224, fan housing; 225, volute; 226, hub; 227, blade; 228, soundproof ring; 230, air guide duct; 231, duct air inlet; 232, duct air outlet; 233, first straight pipe section; 234, arc-shaped air guide plate; 235, second straight pipe section; 240, heat generating member; 250, heat dissipation fin; 260, heat conducting member; 270, encapsulation housing; 300, electronic device. DETAILED DESCRIPTION

[0077] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are for the purpose of explanation only, and should not be understood as limiting the present application.

[0078] In the description of the present application, it should be noted that unless explicitly defined and limited otherwise, the terms "mounting", "connecting" should be interpreted broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected or can communicate with each other; can be directly connected, or indirectly connected through an intermediate medium, or 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 present application can be understood according to the specific circumstances.

[0079] In the description of the present application, it should be understood that the terms "first", "second", etc. are only for the purpose of description, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0080] In the description of the present application, it should be understood that the terms "upper", "lower", "side", "front", "back" and the like indicate the orientation or positional relationship based on the installed orientation or positional relationship, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0081] With the gradual development of wireless charging technology, more and more electronic devices (such as mobile phones) have wireless charging function, and vehicles as daily charging scenes also begin to be equipped with vehicle-mounted wireless charging devices to meet the charging needs of users when riding vehicles. The vehicle-mounted wireless charging device needs to be combined with the whole vehicle scene, and at the same time needs to consider many requirements such as installation position, appearance, noise, vibration and harshness (NVH) parameters, heat dissipation performance, user charging experience and use scene, in order to find the best balance point.

[0082] The principle of the vehicle-mounted wireless charging device capable of realizing wireless charging is mainly to utilize the principle of electromagnetic induction. A charging coil (also called a power transmitting coil) is arranged in the charging device, and a power receiving coil (also called a power receiving coil) is arranged in the electronic device such as a mobile phone. The wireless charging process is that the charging coil generates an alternating current after being connected to electricity, and then generates an alternating magnetic field. The alternating magnetic field acts on the power receiving coil to generate an induced electromotive force in the power receiving coil. The induced electromotive force is converted into direct current that can be used for charging the battery through a power converter.

[0083] During charging, part of the electric energy will be converted into heat. If this heat is not dissipated in time, it will cause the temperature of the electronic device to rise, affecting the stability and safety of the electronic device. Therefore, a centrifugal fan is usually configured in a vehicle-mounted wireless charging device with large power. The centrifugal fan sucks in the external cold air, and then guides the cold air into the gap between the electronic device and the vehicle-mounted wireless charging device through the air guide pipe. The cold air is discharged from the gap after completing the convective heat exchange with the back of the electronic device, thereby achieving the purpose of cooling and heat dissipation of the electronic device.

[0084] In recent years, in order to shorten the charging time, the charging power of the electronic device becomes higher and higher, and the heat generated by the electronic device during charging also becomes more and more. This requires the centrifugal fan of the charging device to always maintain a high speed. However, with the increase of the fan speed, the noise generated by the whole charging device also gradually increases. It becomes the key demand of the structure design of the vehicle-mounted wireless charging device to realize efficient heat dissipation and low noise operation.

[0085] Fig. 1 is a structural schematic diagram of a vehicle-mounted wireless charging device in the prior art. As shown in Fig. 1, the vehicle-mounted wireless charging device 10 includes a housing 11, a centrifugal fan 12, and a wind guide duct 13, the housing 11 is internally provided with a charging coil 14 and other charging components, one side (for example, the top surface) of the housing 11 constitutes a bearing surface 15 for bearing an electronic device 20, when the electronic device 20 is placed on the bearing surface 15, the charging coil 14 can be energized, the alternating magnetic field generated by the charging coil 14 acts on a power receiving coil 21 in the electronic device 20, thereby realizing wireless charging of the electronic device 20.

[0086] A gap can be formed between the electronic device 20 and the bearing surface 15 (for example, by providing a plurality of support protrusions on the bearing surface 15), which is used for heat dissipation of the back of the electronic device 20. Specifically, during charging, the power receiving coil 21 will generate heat to cause the back of the electronic device 20 to heat up, the centrifugal fan 12 can suck in external cold air and guide the cold air into the gap through the wind guide duct 13, and the cold air is discharged from the gap after completing the heat exchange with the back of the electronic device 20, thereby achieving the purpose of heat dissipation and cooling of the electronic device 20.

[0087] As shown in Fig. 1, during the process of guiding the cold air from the air outlet of the centrifugal fan 12 to the gap by the wind guide duct 13, the airflow is turned at least twice, and the flow loss is serious. In order to meet the heat dissipation requirement, the centrifugal fan 12 has to run at a higher speed, which will result in greater system noise. In addition, the airflow turning in the wind guide duct 13 is easy to produce vortex, which will further increase the system noise.

[0088] It can be seen that the vehicle-mounted wireless charging device in the prior art is difficult to balance high efficiency heat dissipation and low noise operation, which affects the user experience.

[0089] Therefore, the inventor has analyzed the working principle of the heat dissipation structure of the vehicle-mounted wireless charging device through simulation test, flow field sound field calculation, model correction, experimental comparison and other methods, and found that the deflection angle of the airflow in the wind guide duct has a considerable influence on the heat dissipation efficiency and operating noise of the centrifugal fan, that is, the greater the deflection angle of the airflow, the more serious the flow loss, resulting in the faster speed of the centrifugal fan required, which will produce greater operating noise.

[0090] The vehicle wireless charging device provided in the embodiments of the present application can be applied to a vehicle. First, the vehicle provided in the embodiments of the present application is introduced, that is, the application scenario of the vehicle wireless charging device is introduced.

[0091] The vehicle wireless charging device provided in the embodiments of the present application can be applied to a vehicle. First, the vehicle provided in the embodiments of the present application is introduced, that is, the application scenario of the vehicle wireless charging device is introduced.

[0092] FIG. 2 is a schematic diagram of the overall structure of the vehicle 100 provided in the embodiments of the present application. As shown in FIG. 2, the vehicle 100 provided in the embodiments of the present application can be any vehicle such as a car, a train, a bullet train, a high-speed rail, a ship or an airplane, and the type or form of the vehicle 100 is not limited in the present application.

[0093] In some examples, the vehicle 100 can be a car, for example, the vehicle 100 can be a sedan, a van, a truck, an engineering vehicle, a passenger bus, a pickup truck, a multi-purpose vehicle (MPV) or a sport utility vehicle (SUV), etc. In addition, the vehicle 100 can be a fuel car, an electric car or a hydrogen-powered car.

[0094] In some examples, the vehicle 100 can be various types of cars that can be driven to travel by electric power, for example, can be a battery electric vehicle (BEV), a range extended electric vehicle (REEV), a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV), etc., but is not limited thereto. At this time, the vehicle 100 can be charged in a wired manner (for example, through a charging pile) or in a wireless manner (for example, through a charging / discharging coil).

[0095] In some examples, the vehicle 100 can be a vehicle with partial or full automatic driving function. For example, the vehicle 100 can have a driving automation level of Level 0 (L0), Level 1 (L1), Level 2 (L2), Level 3 (L3), Level 4 (L4), or Level 5 (L5) according to the classification standard of the Society of Automotive Engineers (SAE).

[0096] The vehicle 100 is taken as an electric vehicle as an example below. As shown in FIG. 2, the vehicle 100 provided by the embodiment of the present application includes a vehicle body 110, a battery pack 120, and a plurality of vehicle wheels 130.

[0097] The vehicle body 110 is a main part of the vehicle 100, and includes doors, windows, seats, a chassis 111, and basic components such as a powertrain system inside the vehicle body 110. The battery pack 120 is detachably suspended below the chassis 111, and the plurality of vehicle wheels 130 (for example, four) are rotatably arranged on the chassis 111. The battery pack 120 serves as a power source of the vehicle 100, and provides electric energy for the powertrain system. The powertrain system is connected with the vehicle wheels 130, and is used to convert the electric energy of the battery pack 120 into driving force and transmit the driving force to the vehicle wheels 130, so as to drive the vehicle 100 to travel.

[0098] In some examples, the powertrain system includes an electric motor and a transmission. The battery pack 120 supplies power to the electric motor, an output shaft of the electric motor is connected with the vehicle wheels 130 through the transmission, the electric motor drives the vehicle wheels 130 to rotate, and the vehicle 100 can be driven to travel.

[0099] In some examples, the battery pack 120 is suspended below the chassis 111. The battery pack 120 includes a battery pack lower box and a battery module. The battery module is used to store electric energy and is fixedly installed in an installation cavity of the battery pack lower box. The battery pack lower box provides bearing and protection for the battery module, and suspends and installs the battery module below the chassis 111.

[0100] In some examples, the battery pack 120 can further include a heat dissipation assembly for dissipating heat of the battery module, and an electrical assembly for realizing various functions, but is not limited thereto. The heat dissipation assembly includes a liquid cooling plate, for example, and the electrical assembly includes a battery management system (BMS) and a battery measurement system (BMU), for example.

[0101] In addition to driving the vehicle 100 as a power source, the battery pack 120 can also power other electrical equipment of the vehicle 100 to achieve corresponding functions. For example, the battery pack 120 can also power the wireless charging device 200.

[0102] As shown in FIG. 2, the vehicle 100 provided by the embodiments of the present application further includes a wireless charging device 200, which is electrically connected with the battery pack 120, for inputting the electric energy in the battery pack 120 to the electronic device 300, realizing wireless charging of the electronic device 300, so as to meet the charging demand of the electronic device 300 of the user when riding the vehicle.

[0103] In some examples, the wireless charging device 200 can be installed at a central storage box, an armrest box or the like, and the user can place the electronic device 300 on the wireless charging device 200 to charge the electronic device 300. For example, the wireless charging device 200 can automatically sense the placement position of the electronic device 300, and can automatically trigger the charging coil to charge the electronic device 300 when the placement position is correct.

[0104] In some examples, the wireless charging device 200 has multiple charging gears, and according to the different charging power of the electronic device 300, the wireless charging device 200 can select a corresponding charging gear to wirelessly charge the electronic device 300. In addition, the wireless charging device 200 can simultaneously wirelessly charge one, two or more electronic devices 300.

[0105] In some examples, the electronic device 300 can be a mobile terminal device with wireless charging function, such as a mobile phone, a tablet computer, a smart watch, a smart bracelet or the like.

[0106] The embodiments of the present application mainly relate to the structural improvement of the vehicle-mounted wireless charging device, and the structural details of the wireless charging device 200 will be further introduced below in combination with the drawings. FIG. 3 is a structural schematic diagram of the wireless charging device 200 provided by the embodiments of the present application. FIG. 4 is an exploded view of the wireless charging device 200 provided by the embodiments of the present application. As shown in FIG. 3 and FIG. 4, the wireless charging device 200 provided by the embodiments of the present application includes a shell 210, a centrifugal fan 220 and a wind guide pipe 230.

[0107] The shell 210 has a receiving cavity in which a charging module (not shown in the figure) is installed. The shell 210 includes a bearing surface 213 for bearing or placing the electronic device 300. In a possible charging scenario, when the electronic device 300 needs to be wirelessly charged using the wireless charging device 200, the user can place the electronic device 300 on the bearing surface 213. The charging module automatically senses the placement position of the electronic device 300, and if the placement position is correct, the charging module triggers to charge the electronic device 300.

[0108] The specific structure of the charging module is not limited. In some examples, the charging module can include a circuit board, which can be a printed circuit board assembly (PCBA) board or the like, and a plurality of electronic elements are installed on the circuit board. The types of electronic elements are not limited, and for example, can include a charging coil, a capacitor, an inductor, a chip, a driver, a voltage reduction circuit, a shielding layer, and the like. In addition to the charging module, the inside of the receiving cavity can also include a battery system, a support fixing member, and the like, which are not limited by the embodiments of the present application. For example, the air guide pipe 230 is also located in the receiving cavity, and is used to guide the airflow from the centrifugal fan 220 to the electronic device 300 to achieve heat dissipation and cooling of the electronic device 300.

[0109] In some examples, when the electronic device 300 is placed on the bearing surface 213, a gap is formed between the bearing surface 213 and the electronic device 300. The airflow blown out of the air outlet of the air guide pipe 230 (i.e., the pipe air outlet 232) can flow along the outer surface of the electronic device 300 in the gap to dissipate heat for the entire electronic device 300. The formation of the gap is not limited, for example, as shown in FIGS. 3 and 4, a groove 214 can be provided on the bearing surface 213, and the electronic device 300 is attached to the groove 214 to form the gap. Alternatively, some protrusions can be provided on the bearing surface 213, and the electronic device 300 is placed on the protrusions when charging, and the gap is formed between the electronic device 300 and the bearing surface 213.

[0110] In some examples, the gap extends in the length direction of the electronic device 300 (the left-right direction in FIG. 3 can be the length direction of the electronic device 300) to increase the contact area of the airflow with the electronic device 300 and improve the heat dissipation effect. In other examples, the gap can also extend in the width direction of the electronic device 300, which is not limited by the present application.

[0111] As shown in FIG. 3 and FIG. 4, the recess 214 is arranged on the bearing surface 213, so that when the electronic device 300 is placed on the bearing surface 213, a gap can be formed between the bearing surface 213 and the electronic device 300. The recess 214 has a U-shaped groove wall, and a ventilation opening 215 is arranged on the bottom wall opposite to the opening of the U-shaped groove wall. The air duct 230 is connected to the ventilation opening 215, so that the airflow from the centrifugal fan 220 can sequentially pass through the air duct 230 and the ventilation opening 215 into the gap. The airflow flows from the bottom wall of the U-shaped groove wall to the opening direction, which is also the length direction of the electronic device 300. After the airflow completes sufficient convection heat exchange with the back surface of the electronic device 300, the airflow is discharged from the gap.

[0112] In some examples, two recesses 214 are arranged on the bearing surface 213, and two electronic devices 300 can be placed, that is, the wireless charging device 200 can simultaneously wirelessly charge two electronic devices 300. At this time, one ventilation opening 215 is arranged on each recess 214, and two centrifugal fans 220 and two air ducts 230 are correspondingly arranged. The two centrifugal fans 220 are connected to one recess 214 (ventilation opening 215) through one air duct 230, and can ventilate and cool the electronic device 300 in the corresponding recess 214. In other examples, considering the space saving and other factors, the bearing surface 213 can only have one recess 214, and the bearing surface 213 can only place one electronic device 300, that is, the wireless charging device 200 can only wirelessly charge one electronic device 300 at a time. At this time, only one centrifugal fan 220 and one air duct 230 need to be correspondingly arranged.

[0113] It should be noted that the structure shown in the embodiments of the present application does not constitute a specific limitation on the wireless charging device 200. In other examples, the wireless charging device 200 can further include more or fewer components than shown, such as an interface, a transformer, a control panel, a chip, an indicator light, and the like.

[0114] FIG. 5 is a connection structure diagram of the air duct 230 and the centrifugal fan 220. FIG. 6 is a schematic diagram of the principle of the air duct 230 deflecting the airflow by an angle. As shown in FIG. 5 and FIG. 6, the centrifugal fan 220 has a fan air outlet 223; the air duct 230 has a duct air inlet 231 and a duct air outlet 232, the duct air inlet 231 is connected to the fan air outlet 223, and the air duct 230 is used to deflect the airflow from the fan air outlet 223 by an angle α and discharge the airflow from the duct air outlet 232, and the airflow enters the gap between the electronic device 300 and the bearing surface 213 through the ventilation opening 215 to cool the electronic device 300 by convection, wherein 0 < α ≤ 90°.

[0115] The wireless charging device 200 provided by the embodiment of the present application adjusts the layout position of the centrifugal fan 220 and adaptively adjusts the structure of the air guide pipe 230, so that the deflection angle of the airflow in the air guide pipe 230 is less than 90 degrees. Since the deflection angle of the airflow is small, the flow loss is also small, so the centrifugal fan 220 does not need to run at a high speed to meet the heat dissipation demand of the electronic device 300, and the running noise of the centrifugal fan 220 is also small. In addition, the reduction of the airflow deflection angle can also inhibit the generation of vortex, improve the uniformity of airflow flow, and reduce the airflow noise in the air duct. That is, the embodiment of the present application can balance the heat dissipation efficiency and the running noise, reduce the noise under the premise of ensuring the air volume, so that the vehicle-mounted wireless charging device 200 can realize high-efficiency heat dissipation and low-noise operation at the same time, and improve the user experience.

[0116] In some examples, the value of a can be 12°, 20°, 30°, 45°, 50°, 60°, 68°, 70°, 80°, or 87°, but is not limited thereto.

[0117] In some examples, 30°≤a≤60°. For example, the value of a can be 35°, 40°, 48°, 52°, 56°, or 58°, but is not limited thereto.

[0118] Through the above settings, the balance between heat dissipation efficiency and running noise can be further achieved, the system noise can be maintained within a more reasonable range (e.g., not easily perceived by the user) while ensuring reliable heat dissipation effect on the electronic device 300, and the user experience is further improved. In addition, under the premise that the position of the pipe air outlet 232 is relatively fixed (because the position of the electronic device 300 is relatively fixed), the above angle selection is also beneficial to arranging the centrifugal fan 220 at a suitable position without being easily interfered by other objects such as a small refrigerator, a storage cabinet, and the like in the vehicle, thereby facilitating the layout design of the vehicle interior.

[0119] The air guide pipe 230 in the embodiment of the present application can be any air guide structure capable of deflecting the airflow direction by an angle a, and the present application does not specially limit the specific form of the air guide pipe 230. For example, the air guide pipe 230 can be composed of one or more pipe segments, which can be straight pipes or curved pipes (e.g., pipes with an arc) for example. For example, the air guide pipe 230 can be a curved pipe segment with a certain arc, or the air guide pipe segment can be sequentially connected by a plurality of pipe segments, at least one of which can be a straight pipe segment or a curved pipe segment, and the cross-sectional areas of different pipe segments can be the same or different.

[0120] As shown in FIG. 5 and FIG. 6, the air guide pipe 230 has an L-shaped structure, including a first straight pipe section 233 and a second straight pipe section 235 connected to each other, a port of the first straight pipe section 233 away from the second straight pipe section 235 constituting a pipe air inlet 231, a port of the second straight pipe section 235 away from the first straight pipe section 233 constituting a pipe air outlet 232, a center line of the first straight pipe section 233 being parallel to the air outlet direction of the centrifugal fan 220, and an included angle between the center line of the first straight pipe section 233 and the center line of the second straight pipe section 235 being β, β = 180° - a.

[0121] By setting the center line of the first straight pipe section 233 parallel to the air outlet direction of the centrifugal fan 220, the airflow from the centrifugal fan 220 can smoothly enter the first straight pipe section 233, the first straight pipe section 233 does not deflect the airflow direction, and thus does not cause additional flow loss and vortex noise. The included angle between the center line of the first straight pipe section 233 and the center line of the second straight pipe section 235 is β, so that the airflow can be deflected by a angle through a single deflection (turning).

[0122] Through the above settings, the degree of disorder in the flow channel can be weakened, the flow loss can be reduced, the airflow uniformity can be improved, and the wind increasing and noise reducing effects can be further achieved. While ensuring reliable heat dissipation effect on the electronic device 300, the system noise can be maintained within a more reasonable range (e.g., not easily perceived by the user), and the user experience can be further improved. In addition, under the premise that the position of the pipe air outlet 232 is relatively fixed (because the position of the electronic device 300 is relatively fixed), the air guide pipe 230 with the above structure is also beneficial to arranging the centrifugal fan 220 at a suitable position without being easily interfered by other objects such as a small refrigerator, a storage cabinet, etc. in the vehicle, thereby facilitating the layout design of the vehicle interior.

[0123] In some examples, the specific structure of the air guide pipe 230 can be designed by various methods such as flow field calculation and experimental comparison. For example, the boundary vorticity flow and flow loss rate in the flow channel can be calculated according to the Navier-Stokes equation of turbulent flow. The boundary vorticity flow is used to qualitatively represent the degree of airflow disorder, and the flow loss rate is used to quantitatively represent the loss degree of airflow due to the flow channel structure. The boundary vorticity flow is calculated according to the following formula:

[0124] wherein, represents the boundary vorticity flow, represents the normal vector, represents the gradient, μ represents the fluid viscosity, represents the angular velocity.

[0125] The flow loss rate calculation formula is:

[0126] wherein, δ represents the flow loss rate, Q 出风口 represents the flow rate of the air outlet of the pipeline 232, and Q represents the air outlet flow rate of the centrifugal fan 220 when the air guide pipeline 230 is not installed (zero background pressure).

[0127] Table 1 is a table of the corresponding relationship between the flow loss rate and the airflow deflection angle calculated in the case of single deflection (turning). As shown in Table 1, the greater the deflection angle of the airflow in the air guide pipeline 230, the greater the flow loss rate. When the deflection angle of the airflow in the air guide pipeline 230 is less than or equal to 90°, the flow loss rate is relatively small, and when the deflection angle of the airflow in the air guide pipeline 230 is greater than 90° (for example, 120°), the flow loss rate is relatively large. In combination with the calculation results of the boundary vorticity flow described above, the L-shaped air guide pipeline 230 is finally selected in the embodiments of the present application, that is, the air guide pipeline 230 deflects (turns or deflects) the airflow direction once, and the deflection angle is not more than 90°. The above design can effectively reduce the flow loss rate and the vortex noise, and improve the user experience. And it is beneficial to arrange the centrifugal fan 220 at a suitable position, which facilitates the layout design of the vehicle interior.

[0128] Table 1: Table of corresponding relationship between flow loss rate and airflow deflection angle of single deflection.

[0129] In some examples, as shown in FIGS. 5 and 6, the first straight pipe section 233 and the second straight pipe section 235 are connected with the arc-shaped air guide plate 234, that is, the first straight pipe section 233 is connected with the second straight pipe section 235 through the arc-shaped air guide plate 234, or in other words, the first straight pipe section 233 is connected with the second straight pipe section 235 through the elbow pipe section including the arc-shaped air guide plate 234.

[0130] By arranging the arc-shaped air guide plate 234, the first straight pipe section 233 and the second straight pipe section 235 can be smoothly connected, so that when the flow direction of the airflow is deflected by an angle, the degree of disorder in the flow channel can be further weakened, the flow loss can be reduced, the airflow flow uniformity can be improved, the flow noise can be reduced, the effect of increasing the air flow and reducing the noise can be further achieved, and the user experience can be improved.

[0131] In some examples, in combination with FIGS. 5 and 6, the cross-sectional shape of the first straight pipe section 233 and the second straight pipe section 235 is rectangular, and the cross-sectional area of the first straight pipe section 233 is smaller than that of the second straight pipe section 235. In other examples, the cross-sectional shape of the first straight pipe section 233 and the second straight pipe section 235 can also be circular or elliptical or other shapes, and the cross-sectional shape / area of the first straight pipe section 233 and the second straight pipe section 235 can be the same or different, which is not limited in the present application.

[0132] In some examples, as shown in FIGS. 5 and 6, the area of the duct air outlet 232 is smaller than the area of the duct air inlet 231. With the above arrangement, the pressure difference between the flow channel background pressure and the external air pressure can be increased, further enhancing the air blowing capacity of the centrifugal fan 220, thereby facilitating the improvement of the heat dissipation performance of the electronic device 300.

[0133] In some examples, in combination with FIGS. 5-7, the fan air outlet 223 and the duct air inlet 231 are mutually interfaced, and the fan air outlet 223 and the duct air inlet 231 are identical in shape and equal in size. With the above arrangement, the fan air outlet 223 and the duct air inlet 231 can be smoothly connected, avoiding the flow loss and vortex noise caused by the sudden increase or decrease in the area of the airflow at the junction of the centrifugal fan 220 and the air guide duct 230, further achieving the effect of increasing the air flow and reducing the noise.

[0134] As shown in FIG. 7, the centrifugal fan 220 includes a volute 225 and an impeller rotatably arranged in the volute 225. The volute 225 is provided with at least one fan air inlet, for example, a first fan air inlet 221. Under the action of rotation of the impeller, ambient air from the outside can enter the inside of the volute 225 via the first fan air inlet 221, and then be discharged to the air guide duct 230 by the fan air outlet 223.

[0135] FIG. 7 is a connection structure diagram of the air guide duct 230 and the volute 225. As shown in FIG. 7, the fan air outlet 223 is located on the volute 225, and the air guide duct 230 and the volute 225 form an integrated structure through an integral molding process. At this time, the fan air outlet 223 and the duct air inlet 231 are located in the middle of the integrated structure, i.e., at the junction of the air guide duct 230 and the volute 225. The fan air outlet 223 and the duct air inlet 231 can overlap each other, or in other words, the fan air outlet 223 is the duct air inlet 231, and the duct air inlet 231 is the fan air outlet 223.

[0136] With the above arrangement, the air guide duct 230 and the volute 225 do not need to be connected as an integrated structure through additional physical connection means such as screwing or clamping, which not only can improve the connection reliability of the air guide duct 230 and the volute 225, but also is conducive to simplifying the production process and improving the production efficiency. In addition, by arranging the above two as an integrated structure, it is also conducive to reducing the vibration noise, further achieving the effect of increasing the air flow and reducing the noise.

[0137] In some examples, the integrated structure can be a plastic or metal piece, and the integral molding process can be, for example, an injection molding process or 3D printing, and in addition, can be casting or forging, etc., which is not specially limited in the present application.

[0138] In some examples, as shown in FIGS. 5-7, the centrifugal fan 220 further has a second fan air inlet 222 located on the volute 225, and the first fan air inlet 221 is opposite to the second fan air inlet 222 and is distributed on both sides of the impeller.

[0139] In some examples, the first fan air inlet 221 and the second fan air inlet 222 are respectively located on the left and right sides of the volute 225, so that the air inlet direction and the air outlet direction of the fan are perpendicular to each other. The first fan air inlet 221 is a main air inlet for providing a main air flow, and the second fan air inlet 222 is a secondary air inlet for providing an additional air function. The second fan air inlet 222 is provided with a mounting plate fixedly connected with the volute 225 and designed as a hollow structure. The mounting plate is connected with the impeller and is used to rotatably arrange the impeller in the volute 225.

[0140] In some examples, the mounting plate can not be hollow, and the centrifugal fan 220 only has one air inlet (i.e., the first fan air inlet 221) without the second fan air inlet 222.

[0141] In some examples, as shown in FIG. 5, the centrifugal fan 220 further includes a fan shell 224 sleeved on the outer periphery of the volute 225. The fan shell 224 is designed as a hollow structure at the corresponding positions of the first fan air inlet 221 and the second fan air inlet 222, so that the ambient air can enter the inside of the fan through the hollow part. By arranging the centrifugal fan 220, the structural strength of the centrifugal fan 220 can be improved, and the centrifugal fan 220 is convenient to install and fix.

[0142] FIG. 8 is a structural schematic diagram of the impeller. FIG. 9 is a schematic diagram of the setting position of the noise ring 228. As shown in FIGS. 7-9, the impeller in the volute 225 includes a hub 226, a plurality of blades 227, and a noise ring 228.

[0143] In some examples, the hub 226 is used to wrap the rotating motor structure and serves as a connecting base of the blades 227. The blades 227 are used to blow air to provide a source of air flow power. The blades 227 can be C-shaped blades (such as forward-inclined blades, radial blades, or backward-inclined blades) or S-shaped blades, etc. The noise ring 228 is used to improve the overall strength of the impeller and to avoid the blades 227 from colliding with other blades due to insufficient material rigidity, thereby causing additional noise.

[0144] The hub 226 is configured to rotate around a rotation axis (e.g., an output shaft of a motor) so that the entire impeller is rotatably arranged in the volute 225. A plurality of blades 227 are radially and spacedly arranged at the outer periphery of the hub 226. A silence ring 228 is arranged around (e.g., sleeved on) the outer periphery of the hub 226 and sequentially connected with the plurality of blades 227, e.g., the silence ring 228 sequentially penetrates the plurality of blades 227 to form a closed circular ring structure, and the center of the silence ring 228 is the center of the hub 226 / rotation axis.

[0145] As shown in FIG. 9, in the radial direction of the hub 226 (i.e., in the radial direction of the rotation axis), the blade length of the blade 227 is L, where L is the distance between the outermost edge and the innermost edge of the blade 227 in the radial direction, and the distance between the silence ring 228 and the hub 226 is D, where D is the distance between the inner wall of the silence ring 228 and the outer wall of the hub 226 in the radial direction, and 0 < D / L < 1. For example, 0.1, 0.2, 0.3, 0.4, 0.48, 0.50, 0.60, 0.8, or 0.9, etc., but not limited thereto.

[0146] The embodiment of the present application offsets the silence ring 228 radially inward, i.e., radially shrinks the silence ring 228 (reduces the radius of the silence ring 228), so that the silence ring 228 is connected to the radially middle position of the blade 227. In this way, the blocking effect of the silence ring 228 on the high-speed region of the blade trailing edge airflow (the air supply efficiency is improved) is weakened, and the sound source term intensity of the blade gap is also weakened, achieving the effect of increasing wind and reducing noise. In addition, the silence ring 228 can better support the blade 227, further improve the overall strength of the impeller, and avoid the phenomenon of blade 227 shaking or colliding during rotation.

[0147] In some examples, 0.3 ≤ D / L ≤ 0.7. For example, the value of D / L can be 0.35, 0.4, 0.48, 0.50, 0.53, 0.60, 0.63, or 0.67, etc., but not limited thereto. Through the above selection, better wind increasing and noise reducing effects can be obtained, and the overall strength of the impeller can be further improved.

[0148] Fig. 10 is a schematic diagram of the setting position of the silence ring 228. As shown in Figs. 7-10, the centrifugal fan 220 has a first fan air inlet 221 opposite to the top end surface of the hub 226, in the axial direction of the hub 226 (i.e. in the axial direction of the rotating shaft), the blade width of the blade 227 is W, the distance between the silence ring 228 and the blade edge adjacent to the blade 227 on the side of the first fan air inlet 221 is d, and 0 < d / W ≤ 1. For example, the value of d / W can be 0.1, 0.2, 0.3, 0.35, 0.45, 0.5, 0.6, 0.73, 0.82, or 0.9, etc., but is not limited thereto.

[0149] The embodiment of the present application can weaken the hindering effect of the silence ring 228 on the high-speed area of the blade trailing edge airflow (improve the air supply efficiency), and weaken the sound source term intensity of the blade gap, thereby achieving the effect of increasing the air volume and reducing the noise.

[0150] In some examples, the value of d / W can be 1. At this time, the silence ring 228 is arranged on the outer wall (end surface) of the blade edge of the blade 227 away from the first fan air inlet 221.

[0151] In some examples, 0.3 ≤ d / W ≤ 0.7. For example, the value of d / W can be 0.35, 0.4, 0.45, 0.5, 0.55, or 0.65, etc.

[0152] The embodiment of the present application can weaken the hindering effect of the silence ring 228 on the high-speed area of the blade trailing edge airflow (improve the air supply efficiency), and weaken the sound source term intensity of the blade gap, thereby achieving the effect of increasing the air volume and reducing the noise.

[0153] The embodiment of the present application can also be designed by simultaneously radially shrinking and axially shrinking the silence ring 228, i.e. reducing the radius of the silence ring 228 and arranging the silence ring 228 at the middle position of the blade in the axial direction, that is, arranging the silence ring 228 at the middle position of the blade 227 in the radial and axial directions, thereby achieving good effects of increasing the air volume and reducing the noise, and effectively improving the overall strength of the impeller.

[0154] In some examples, when the centrifugal fan 220 has the first fan air inlet 221 and the second fan air inlet 222 at the same time (i.e., double-sided air inlet), 0 < d / W < 1 (i.e., excluding the case where d / W is equal to 1). At this time, the noise ring 228 is designed to be axially inwardly offset, without being arranged on the side wall (end face) of any one side. In this way, the airflow from the first fan air inlet 221 or the second fan air inlet 222 is not easily hindered by the noise ring 228, achieving better wind increasing and noise reducing effects. In addition, the noise ring 228 can better support the blades 227, further improving the overall strength of the impeller, and avoiding the phenomenon of blade 227 shaking or blade collision when the impeller rotates.

[0155] In some examples, the specific position of the noise ring 228 can be designed by various methods such as flow field calculation and experimental comparison. For example, the centrifugal fan 220 can be designed based on the coupling of aerodynamic acoustics and structural mechanics. Without reducing the strength of the impeller structure, the right end sound source dipole term of the low Mach number Powell vortex sound equation is used as follows:

[0156] Where c represents the speed of sound of air, p represents the instantaneous sound pressure, t is time, and p represents the air density, and are the speed and angular velocity of the airflow, respectively.

[0157] By increasing or decreasing the design to obtain the optimal fan impeller structure, the noise ring 228 is designed to be inwardly and centrally offset in the radial and axial directions. Finally, the position of the noise ring 228 is calculated to be 0.3 ≤ D / L ≤ 0.7 and 0.3 ≤ d / W ≤ 0.7.

[0158] On the basis of the centrifugal fan 220 and the air guide pipeline 230 provided in the embodiments of the present application, experimental verification is performed. The experimental results show that, under the same system air volume, 10 dB of noise reduction can be achieved; under the same noise, the system air volume is increased by 60%; under the same fan speed, the noise is reduced by 4-5 dB, and the air volume is increased by 27%. That is, the wireless charging device 200 provided in the embodiments of the present application can simultaneously achieve high-efficiency heat dissipation and low-noise operation, and improve the user experience.

[0159] On the basis of the centrifugal fan 220 and the air guide pipeline 230 provided in the foregoing embodiments, the present application further provides a heat dissipation device for dissipating heat of a heat generating component. The heat dissipation device may, for example, be the wireless charging device 200 described above, and the heat generating component may, for example, be the electronic device 300 described above, but is not limited thereto. The heat dissipation device provided in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0160] Fig. 11 is a structural schematic diagram of a heat dissipation device according to an embodiment of the present application. As shown in Fig. 11, the heat dissipation device according to an embodiment of the present application comprises a centrifugal fan 220, an air guide duct 230, and a heat generating component 240.

[0161] The centrifugal fan 220 has a fan air outlet 223, and the air guide duct 230 has a duct air inlet 231 and a duct air outlet 232. The duct air inlet 231 is connected to the fan air outlet 223. The air guide duct 230 is used to deflect the airflow from the fan air outlet 223 by an angle a and then discharge the airflow from the duct air outlet 232 to dissipate heat from the heat generating component 240, where 0 < a ≤ 90°.

[0162] The heat dissipation device according to an embodiment of the present application adjusts the layout position of the centrifugal fan 220 and adaptively adjusts the structure of the air guide duct 230, so that the deflection angle of the airflow in the air guide duct 230 is less than 90 degrees. Since the deflection angle of the airflow is small, the flow loss is also small. Therefore, the centrifugal fan 220 does not need to run at a high speed to meet the heat dissipation requirement of the heat generating component 240, and the operating noise of the centrifugal fan 220 is also small. In addition, the reduction of the airflow deflection angle can also inhibit the generation of vortex, improve the uniformity of airflow flow, and reduce the airflow noise in the air duct. That is, the embodiment of the present application can balance the heat dissipation efficiency and the operating noise, reduce the noise under the premise of ensuring the air volume, so that the heat dissipation device can realize high-efficiency heat dissipation and low-noise operation at the same time, and improve the user experience.

[0163] The structure details of the centrifugal fan 220 and the air guide duct 230, and the connection relationship therebetween, can refer to the related descriptions in the foregoing embodiments, which will not be described herein again.

[0164] In some examples, the heat dissipation device can be any electronic device (such as a notebook computer) that is space-limited and needs heat dissipation. The heat generating component 240 can include various electronic devices such as chips, chip control boards (such as motherboards), graphics cards, processors, controllers (control boards), integrated circuits, transistors, etc., but is not limited thereto.

[0165] In some examples, as shown in FIG. 11, the heat dissipation device further comprises a heat dissipation fin 250 in thermal connection with the heat generating component 240, and the airflow discharged from the air outlet 232 of the air duct is used to dissipate heat from the heat dissipation fin 250. Through the above arrangement, the airflow from the air outlet 232 of the air duct can flow through the surface of the heat dissipation fin 250 to perform forced convection heat exchange with the heat dissipation fin 250, and the heat dissipation fin 250 is in thermal connection with the heat generating component 240, thereby indirectly achieving heat dissipation and cooling of the heat generating component 240. The advantage of the above arrangement is that the positions of the centrifugal fan 220 and the air duct 230 can be flexibly selected, thereby facilitating the layout design of the heat dissipation device and reducing the design difficulty of the heat dissipation device.

[0166] In some examples, as shown in FIG. 11, the heat dissipation device further comprises a heat conducting component 260 arranged between the heat generating component 240 and the heat dissipation fin 250, and the heat generated by the heat generating component 240 can be conducted to the heat dissipation fin 250 through the heat conducting component 260, i.e. the heat dissipation fin 250 is in thermal connection with the heat generating component 240 through the heat conducting component 260. For example, the heat conducting component 260 comprises heat dissipation silicone grease.

[0167] In some examples, as shown in FIG. 11, a packaging shell 270 is further arranged between the heat dissipation fin 250 and the heat conducting component 260. The packaging shell 270 is arranged to package, fix and protect the heat conducting component 260 and the heat generating component 240. The arrangement of the packaging shell 270 should not hinder the heat transfer between the heat dissipation fin 250 and the heat conducting component 260, and therefore the packaging shell 270 can be made of high thermal conductivity material, for example, the packaging shell 270 can be a metal shell.

[0168] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A heat dissipation device, characterized in that, include: Centrifugal fan (220) with fan outlet (223); The air duct (230) has an air inlet (231) and an air outlet (232). The air inlet (231) is connected to the fan outlet (223). The air duct (230) is used to deflect the airflow from the fan outlet (223) by an angle α and discharge it from the air outlet (232) to dissipate heat from the heat-generating component (240), wherein 0 < α ≤ 90°. The cross-sectional area of ​​the air inlet (231) is different from that of the air outlet (232).

2. The heat dissipation device according to claim 1, characterized in that, The air duct (230) includes a first straight pipe section (233) and a second straight pipe section (235) connected to each other. The port of the first straight pipe section (233) away from the second straight pipe section (235) constitutes the air inlet (231) of the duct, and the port of the second straight pipe section (235) away from the first straight pipe section (233) constitutes the air outlet (232) of the duct. The centerline of the first straight pipe section (233) is parallel to the air outlet direction of the centrifugal fan (220), and the angle between the centerline of the first straight pipe section (233) and the centerline of the second straight pipe section (235) is β, where β = 180° - α.

3. The heat dissipation device according to claim 2, characterized in that, The connection between the first straight pipe section (233) and the second straight pipe section (235) has an arc-shaped air guide plate (234).

4. The heat dissipation device according to any one of claims 1-3, characterized in that, The area of ​​the air outlet (232) of the duct is smaller than the area of ​​the air inlet (231) of the duct.

5. The heat dissipation device according to any one of claims 1-4, characterized in that, The fan outlet (223) and the duct inlet (231) have the same shape and are equal in size.

6. The heat dissipation device according to claim 5, characterized in that, The centrifugal fan (220) includes a volute (225), the fan outlet (223) is located on the volute (225), and the air guide duct (230) and the volute (225) are formed into an integral structure by an integral molding process.

7. The heat dissipation device according to any one of claims 1-6, characterized in that, The heat dissipation device is a wireless charging device, and the heat-generating element (240) is an electronic device (300) that is wirelessly charged through the wireless charging device.

8. The heat dissipation device according to claim 7, characterized in that, The electronic device (300) is carried on the support surface (213) of the wireless charging device, and a gap is formed between the support surface (213) and the electronic device (300). The duct outlet (232) is connected to the gap.

9. The heat dissipation device according to claim 8, characterized in that, The bearing surface (213) is provided with a groove (214) to form the gap. A vent (215) is provided on the groove wall of the groove (214). The air outlet (232) of the pipe is connected to the gap through the vent (215).

10. The heat dissipation device according to claim 8 or 9, characterized in that, 30°≤α≤60°。 11. The heat dissipation device according to any one of claims 1-6, characterized in that, The heat dissipation device includes the heat-generating element (240).

12. The heat dissipation device according to claim 11, characterized in that, The heat dissipation device also includes heat dissipation fins (250) that are thermally connected to the heat-generating element (240), and the airflow discharged from the duct outlet (232) is used to dissipate heat from the heat dissipation fins (250).

13. The heat dissipation device according to any one of claims 1-12, characterized in that, The centrifugal fan (220) includes: Wheel hub (226); Multiple blades (227) are spaced apart on the outer periphery of the hub (226); A silencing ring (228) surrounds the outer periphery of the hub (226) and is sequentially connected to the plurality of blades (227). In the radial direction of the hub (226), the blade length of the blade (227) is L, and the distance between the silencing ring (228) and the hub (226) is D, where 0 < D / L < 1.

14. The heat dissipation device according to claim 13, characterized in that, 0.3≤D / L≤0.

7.

15. The heat dissipation device according to claim 13 or 14, characterized in that, The centrifugal fan (220) has a first fan inlet (221) opposite to the top end face of the hub (226). In the axial direction of the hub (226), the blade width of the blade (227) is W. The distance between the silent ring (228) and the blade edge of the blade (227) adjacent to the first fan inlet (221) is d, where 0 < d / W ≤ 1.

16. The heat dissipation device according to claim 15, characterized in that, 0.3≤d / W≤0.

7.

17. The heat dissipation device according to claim 15 or 16, characterized in that, The centrifugal fan (220) also has a second fan inlet (222), and the first fan inlet (221) is opposite to the second fan inlet (222) and distributed on both sides of the hub (226).

18. A centrifugal fan, characterized in that, include: Wheel hub (226); Multiple blades (227) are spaced apart on the outer periphery of the hub (226); A silencing ring (228) surrounds the outer periphery of the hub (226) and is sequentially connected to the plurality of blades (227). In the radial direction of the hub (226), the blade length of the blade (227) is L, and the distance between the silencing ring (228) and the hub (226) is D, where 0 < D / L < 1.

19. The centrifugal fan according to claim 18, characterized in that, 0.3≤D / L≤0.

7.

20. The centrifugal fan according to claim 18 or 19, characterized in that, The centrifugal fan (220) has a first fan inlet (221) opposite to the top end face of the hub (226). In the axial direction of the hub (226), the blade width of the blade (227) is W. The distance between the silent ring (228) and the blade edge of the blade (227) adjacent to the first fan inlet (221) is d, where 0 < d / W ≤ 1.

21. The centrifugal fan according to claim 20, characterized in that, 0.3≤d / W≤0.

7.

22. The centrifugal fan according to claim 20 or 21, characterized in that, The centrifugal fan (220) also has a second fan inlet (222), and the first fan inlet (221) is opposite to the second fan inlet (222) and distributed on both sides of the hub (226).

23. The centrifugal fan according to claim 18, characterized in that, The silencing ring (228) surrounds the outer periphery of the hub (226) and is sequentially connected to the plurality of blades (227), including: The silencing ring (228) surrounds the outer periphery of the hub (226) and passes through the plurality of blades (227).

24. The centrifugal fan according to claim 18 or 23, characterized in that, The silencing ring (228) is a closed circular ring structure.

25. A vehicle, characterized in that, It includes the heat dissipation device as described in any one of claims 1-17, or it includes the centrifugal fan as described in any one of claims 18-24.

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