Liquid cooling heat dissipation ducted fan

Abstract

The invention discloses a liquid cooling heat dissipation ducted fan which comprises a duct, a propeller, a motor, a supporting rib plate, a propeller hub shell and a liquid cooling mechanism. The propeller hub shell is fixed in the duct through the supporting rib plates; a motor and a liquid cooling mechanism are arranged in the propeller hub shell; a rotor output shaft of the motor is connected with a propeller and a fairing through a coupler. The fairing is arranged on the propeller in a sleeving mode, and an opening is formed in the fairing so that blades of the propeller can stretch out. The liquid cooling mechanism is at least partially formed in the propeller hub shell and the supporting rib plate, and the propeller hub shell and the supporting rib plate are of a sandwich structure to form a cooling liquid circulation channel of the liquid cooling mechanism. According to the liquid cooling heat dissipation ducted fan, the cooling liquid flow channels are arranged in the propeller hub shell and the supporting rib plates, the cooling liquid is cooled through the structure of the cooling liquid while the cooling liquid dissipates heat of the motor, the cooling liquid circulates in the propeller hub shell and the supporting rib plates, the motor is continuously cooled, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric aviation ducted fan electric propulsion, and in particular relates to a liquid-cooled heat dissipation ducted fan. Background Art

[0002] As a cutting-edge power technology in the field of electric aviation, ducted fan electric propulsion technology has received extensive attention and application in recent years. Compared with traditional propeller technology, it has significant advantages: external ducting improves flight safety and avoids accidents; precise clearance control improves aerodynamic efficiency; suction effect optimizes airflow and increases lift, improving flight performance; at the same time, it reduces noise and enhances environmental competitiveness. However, the application of ducted fan electric propulsion technology faces a series of technical challenges, especially the problem of motor heat dissipation. Electric propulsion aircraft, especially vertical take-off and landing aircraft, have extremely high requirements for motor power density. During the operation of the ducted fan motor, the efficiency of converting electrical energy into mechanical energy has reached about 90%, but the remaining 10% of energy is converted into heat energy. If it cannot be discharged in time and effectively, it will cause heat accumulation inside the motor and temperature rise. In severe cases, it may even cause failures such as demagnetization of permanent magnet materials or motor burning. Especially when the motor is running at high power, the heat dissipation problem is particularly prominent. The mechanical structure of the ducted fan consists of rotatable blades, annular ducts, drive motors and motor controllers, support ribs and hubs. Among them, the motor usually adopts an inner rotor brushless motor. The stator core is made of stacked sheet materials, and the coil is wound in the stator slot, which becomes the main heat source when the motor is working.

[0003] At present, the cooling method for ducted fan motors mainly relies on air cooling. The traditional air cooling method arranges the motor stator close to the inner surface of the hub, and uses the airflow accelerated by the blades in the duct to blow the outer surface of the hub to remove heat. In order to enhance the heat dissipation effect, some designs add heat dissipation fins to the outer surface of the hub to increase the heat dissipation area, or install a fan inside the hub to introduce the airflow in the duct into the hub to dissipate heat for the motor. However, these heat dissipation methods have many limitations: the heat dissipation area is limited, and the heat dissipation effect is poor for motors with medium and high power densities; the heat dissipation of the motor is uneven, and there is a positive temperature gradient on the outer surface of the hub along the airflow direction; the addition of heat dissipation fins not only increases the structural weight, but also brings additional air resistance, reducing the thrust-to-weight ratio of the ducted fan; and the heat dissipation method of introducing the ducted airflow into the hub requires the design of a complex cooling airflow route inside the hub, which increases the difficulty of internal device arrangement. At the same time, the direct air blowing of the heat-generating components also increases the air resistance, further reducing the thrust-to-weight ratio of the ducted fan.

[0004] In view of the heat dissipation problem of ducted fan motors, it is urgent to improve the existing ducted fans to meet the current and future needs and applications of ducted fans. In this context, the present invention proposes a liquid-cooled ducted fan to solve the heat dissipation problem of existing ducted fans and ensure the stability and reliability of ducted fan motors under high power density operation. Summary of the invention

[0005] The purpose of the present invention is to provide a liquid-cooled ducted fan to address the above shortcomings, solve the problem of low heat dissipation efficiency of the ducted fan using air cooling, avoid adding fins to enhance air cooling, and use liquid cooling circulation to improve heat dissipation efficiency. To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A liquid-cooled heat dissipation ducted fan comprises a duct, a propeller, a motor, a supporting rib, a hub shell and a liquid cooling mechanism; the hub shell is fixed in the duct by the supporting ribs; the hub shell is provided with a motor and a liquid cooling mechanism; the rotor output shaft of the motor is connected to the propeller and the fairing by a coupling; the fairing is sleeved on the propeller and is provided with an opening to allow the propeller blades to extend out; the liquid cooling mechanism is at least partially formed inside the hub shell and the supporting ribs, wherein the hub shell and the supporting ribs are a sandwich structure to form a coolant circulation channel for the liquid cooling mechanism.

[0007] Furthermore, the liquid cooling mechanism includes a liquid storage tank and a coolant flow channel; a liquid storage tank is provided on one side of the motor in the hub shell; a coolant outlet and a coolant inlet are respectively provided on the liquid storage tank; the inside of the hub shell and the supporting ribs are both provided with connected coolant flow channels; the coolant outlet and the coolant inlet are respectively connected to the coolant flow channel in the hub shell through pipelines.

[0008] Furthermore, the coolant flow channel includes a first coolant flow channel unit and a second coolant flow channel unit; the first coolant flow channel unit is arranged in the hub shell; the coolant outlet and the coolant inlet are respectively connected to the first coolant flow channel unit; the second coolant flow channel unit is arranged in the supporting rib; the second coolant flow channel unit is connected to the first coolant flow channel unit.

[0009] Furthermore, the first coolant flow channel unit includes an annular diverter flow channel, a radial diverter flow channel, an axial converging cavity and an axial diverter flow channel; the annular diverter flow channel is connected to the coolant outlet; after the coolant in the liquid storage tank flows into the annular diverter flow channel from the coolant outlet, it passes through the radial diverter flow channel, the axial converging cavity and the axial diverter flow channel in turn, and finally dispersed in the hub shell corresponding to the motor through the axial diverter flow channel to cool the motor.

[0010] Furthermore, the first coolant flow channel unit also includes a return flow channel; one end of the second coolant flow channel unit is connected to the axial diversion flow channel, and the other end is connected to the return flow channel; the coolant in the axial diversion flow channel flows out and enters the second coolant flow channel unit for self-heat dissipation, and then flows back to the liquid storage tank from the return flow channel.

[0011] Furthermore, the second coolant flow channel unit includes a vertical radial flow channel and a transverse converging flow channel; radial flow channels symmetrical about the central axis of the support rib are respectively provided on both sides of the support rib, the radial flow channel on one side is connected with the axial diversion flow channel, and the radial flow channel on the other side is connected with the return flow channel; a converging flow channel is provided at one end of the support rib away from the hub shell, and the radial flow channels on both sides of the support rib are connected through the converging flow channel.

[0012] Furthermore, the liquid cooling mechanism also includes a circulating pump; a circulating pump is provided at the bottom of the liquid storage tank; the outlet of the circulating pump is connected to the coolant outlet through a pipeline to drive the coolant in the liquid storage tank to circulate in the coolant flow channel in the hub shell and the supporting ribs.

[0013] Furthermore, a sealing groove is provided on the contact surface between the supporting rib plate and the hub shell; the sealing groove is arranged around the radial flow channel; and a sealing ring is provided in the sealing groove.

[0014] Furthermore, the supporting rib is a hollow sandwich structure with a through-hole for passing the wires opened inside.

[0015] Furthermore, a heat-conducting layer is provided on the contact surface between the stator of the motor and the hub shell.

[0016] The beneficial effects of the present invention are:

[0017] The present invention discloses a liquid-cooled heat dissipation ducted fan, comprising a duct, a propeller, a motor, a supporting rib, a hub shell and a liquid cooling mechanism; the hub shell is fixed in the duct through the supporting rib; the hub shell is provided with a motor and a liquid cooling mechanism; the rotor output shaft of the motor is connected to the propeller and the fairing through a coupling; the fairing is sleeved on the propeller, and an opening is provided on it to allow the propeller blades to extend; the liquid cooling mechanism is at least partially formed inside the hub shell and the supporting rib, wherein the hub shell and the supporting rib are sandwich structures to form a coolant flow channel of the liquid cooling mechanism. The liquid-cooled heat dissipation ducted fan of the present invention adopts a coolant flow channel arranged in the hub shell and the supporting rib, so that the coolant dissipates heat to the motor while using its own structure to cool the coolant, so that the coolant circulates in the hub shell and the supporting rib, continuously cools the motor, improves the heat dissipation efficiency, and avoids adding fins to strengthen air cooling and heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the liquid cooling heat dissipation duct fan of the present invention;

[0020] Figure 3 It is a schematic diagram of the structure of the outer shell of the hub shell of the present invention;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the intermediate interlayer of the hub shell and the first coolant flow channel unit of the present invention;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the intermediate interlayer of the hub shell and the first coolant flow channel unit from another perspective of the present invention;

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the inner shell of the hub shell of the present invention;

[0024] Figure 7 It is a schematic structural diagram of the contact surface between the supporting rib plate and the hub shell of the present invention;

[0025] Figure 8 It is a schematic diagram of the cross-sectional structure of the supporting rib plate of the present invention;

[0026] Fig. 9 This is a schematic diagram of the structure of the coolant of the present invention dissipating heat for other concentrated heating devices.

[0027] In the attached drawings: 1-duct, 2-blade, 3-motor, 4-coupling, 5-fairing, 6-support rib, 7-hub shell, 8-liquid cooling mechanism, 9-liquid storage tank, 10-coolant outlet, 11-coolant inlet, 12-circulating pump, 13-coolant flow channel, 14-first coolant flow channel unit, 15-annular diversion flow channel, 16-radial diversion flow channel, 17-axial confluence cavity, 18-axial diversion flow channel, 19-return flow channel, 20-second coolant flow channel unit, 21-radial flow channel, 22-converging flow channel, 23-first opening, 24-second opening, 25-third opening, 26-sealing groove, 27-wire opening, 28-inner shell, 29-outer shell, 30-middle interlayer, 31-rotor, 32-stator, 33-connecting pipeline, 34-centralized heating device. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0029] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0030] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0031] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, the element described as "below other elements or features" or "below other elements or features" will then be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0032] A duct refers to a channel through which gas flows. It is essentially a pipe structure, and its main function is to guide the airflow. A ducted fan is a mechanical structure consisting of several rotatable blades surrounded by an annular external duct. It is mainly composed of a drive motor and motor controller, blades, ducts, support ribs, and a hub. The ducted fan motor generally uses an inner rotor brushless motor. The stator core is made of stacked sheet materials, and the coil is wound in the stator slot, which is the main heat source when the motor is working. In a ducted fan or aircraft, the duct guides the external airflow into the ducted fan in an orderly manner through its specific shape and size. This guiding effect helps to reduce flow separation and turbulence losses, thereby improving aerodynamic efficiency.

[0033] Embodiment 1

[0034] See attached Figures 1 to 8 The present invention discloses a liquid-cooled heat dissipation ducted fan including a duct 1, a propeller, a motor 3, a support rib 6, a hub shell 7 and a liquid cooling mechanism 8. The structure of the duct 1 is mainly composed of a duct body and a duct wall. The duct body is used as a channel for gas to flow through. The duct wall supports and protects the structure arranged in the duct body and is usually made of lightweight, high-strength and wear-resistant materials to ensure the stability and service life of the duct 1. A hub shell 7 is provided in the duct 1, and the hub shell 7 is fixed in the duct 1 by the support rib 6, such as Figure 1 As shown, four support ribs 6 can be evenly arranged on the duct wall, one end of the support rib 6 is fixed to the duct wall, and the other end is connected to the hub shell 7 to fix the hub shell 7 in the duct 1. The motor 3 and the liquid cooling mechanism 8 are arranged in the hub shell 7. Figure 1 and 2As shown, the shape of the hub shell 7 can be set to be composed of a cylinder and a semi-spherical shape. It should be understood that the semi-spherical shape can also be a semi-ellipsoidal shape, wherein the motor 3 is arranged at the corresponding position of the cylinder inside the hub shell 7, the motor 3 is an inner rotor brushless motor, and the stator core of the motor 3 is formed by stacking sheet metal. The outer annular surface of the core of the stator 32 is arranged close to the inner wall of the hub shell 7 so that heat is directly conducted from the core to the hub shell 7. A heat conductive layer can be provided on the contact surface between the core of the stator 32 and the hub shell 7, and a heat conductive material is applied to the core of the stator 32 as a heat conductive layer, such as insulating heat conductive silicone grease, to expel the air between the contact surfaces to enhance the heat conduction effect. The rotor 31 of the motor 3 passes through the hub housing 7 and is connected to the propeller through a coupling 4. A fairing 5 is provided on the outside of the propeller. The fairing 5 is used for fairing and reducing resistance. The fairing 5 is provided with a plurality of openings corresponding to the propeller blades 2 for the propeller blades 2 to extend. Since the gap between the blades 2 and the duct wall needs to be controlled more precisely, the coupling 4 is used to eliminate certain installation errors, which is beneficial to the overall assembly of the duct 1 fan. A liquid cooling mechanism 8 is also provided in the hub shell 7. The liquid cooling mechanism 8 is located on a side away from the rotor 31 of the motor 3, wherein at least a part of the liquid cooling mechanism 8 is formed inside the hub shell 7 and the support rib 6. The hub shell 7 and the support rib 6 are a sandwich structure to form a coolant flow channel of the liquid cooling mechanism 8. When the coolant flows into the hub shell 7, the motor 3 in contact with the hub shell 7 is cooled and dissipated; when the coolant flows into the support rib 6, since the support rib 6 is completely under the impact of the airflow in the duct 1, its surface area is the contact area with the airflow, and the airflow can cool the coolant flowing into it. It should be understood that the coolant flowing into the hub shell 7 not only cools and dissipates the motor 3, but also partially dissipates the heat of the coolant after heat exchange with the motor 3 through the combined effect of heat radiation from the outer surface of the hub shell 7 and its contact with the airflow in the duct 1, and then the coolant is further dissipated by the support rib 6, which has a positive effect on strengthening the heat dissipation of the fan motor 3 of the duct 1 and avoiding additional structural heat dissipation. The liquid-cooled heat dissipation ducted fan of the present invention utilizes the hub shell 7 and the supporting ribs 6 of the duct 1 fan itself as part of the liquid cooling mechanism 8, thereby achieving the goal of cooling the motor 3 while cooling the coolant after heat exchange, so that the coolant can be recycled and the additional resistance surface is avoided.

[0035] Specifically, the liquid cooling mechanism 8 includes a liquid storage tank 9, a circulating pump 12 and a coolant flow channel 13. The liquid storage tank 9 is provided in the hub housing 7 for storing coolant. Figure 2As shown, the liquid storage tank 9 can be set at the corresponding position of the semi-spherical shape in the hub shell 7, and the liquid storage tank 9 is respectively provided with a coolant outlet 10 and a coolant inlet 11. The inside of the hub shell 7 and the supporting ribs 6 are both provided with connected coolant channels 13 for the circulation of coolant. The number of coolant channels 13 and the number of supporting ribs 6 correspond one to one. The coolant channels 13 include a first coolant channel unit 14 and a second coolant channel unit 20. The hub shell 7 is provided with a first coolant channel unit 14, and the supporting ribs 6 are provided with a second coolant channel unit 20. The second coolant channel unit 20 is connected to the first coolant channel unit 14. The coolant outlet 10 and the coolant inlet 11 on the liquid storage tank 9 are respectively connected to the first coolant channel unit 14. The coolant flows from the coolant outlet 10 into the first coolant channel unit in the hub shell 7. 14 cools and dissipates the heat of the motor 3, and at the same time, the coolant dissipates the heat itself under the action of the airflow. The coolant then enters the second coolant channel unit 20 in the support rib 6 to further dissipate the heat itself under the action of the airflow, and then flows into the corresponding first coolant channel unit 14, and finally flows back to the liquid storage tank 9 through the coolant inlet 11 connected to the first coolant channel unit 14, and then repeats the above process to cool the motor 3 again, making full use of the hub shell 7 and the support rib 6 structural surface in the high-speed airflow as a heat dissipation surface, so that the coolant is circulated and continuously dissipates the heat of the motor 3, improving the heat dissipation efficiency, and reducing the cost of the coolant heat dissipation without adding additional mechanisms. A circulating pump 12 is also provided at the bottom of the liquid storage tank 9 to provide coolant circulation power in the entire coolant circulation loop, so that the coolant circulates in the first coolant channel unit 14 and the second coolant channel unit 20, wherein the outlet of the circulating pump 12 is connected to the coolant outlet 10 through a pipeline.

[0036] Specifically, Figures 3 to 6 As shown, the hub shell 7 can be set as a sandwich structure, with a total of three layers, consisting of an inner shell 28, an outer shell 29 and an intermediate sandwich 30. The first coolant flow channel unit 14 is designed on the intermediate sandwich 30, and the inner shell 28 and the outer shell 29 play a supporting and sealing role. Figure 4 and 5As shown, the first coolant flow channel unit 14 includes an annular diverter flow channel 15, a radial diverter flow channel 16, an axial converging cavity 17, an axial diverter flow channel 18 and a return flow channel 19. The annular diverter flow channel 15, the radial diverter flow channel 16, the axial converging cavity 17 and the axial diverter flow channel 18 are arranged on the hub shell 7 from right to left and are connected in sequence. The annular diverter flow channel 15 and the radial diverter flow channel 16 are located in the semi-spherical part of the hub shell 7, the axial diverter flow channel 18 and the return flow channel 19 are located in the cylindrical part of the hub shell 7, and the axial converging cavity 17 is located at the junction of the semi-spherical part and the cylindrical part of the hub shell 7. A first opening 23 is provided at the center of the inner shell 28 corresponding to the annular shunt flow channel 15, which is connected to the coolant outlet 10 on the liquid storage tank 9 through a pipeline. The coolant flows through the first opening 23 through the annular shunt flow channel 15 and the radial shunt flow channel 16 to the axial confluence cavity 17, and then dispersed in the cylindrical area of ​​the hub shell 7 through the axial shunt flow channel 18 to increase the heat dissipation area. The other end of the axial shunt flow channel 18 and one end of the return flow channel 19 are respectively connected to the second coolant flow channel unit 20, and a second opening 24 is provided on the inner shell 28 corresponding to the other end of the return flow channel 19, and the second opening 24 is connected to the coolant inlet 11 on the liquid storage tank 9, so that the coolant flows from the axial shunt flow channel 18 into the second coolant flow channel unit 20, and finally flows back to the liquid storage tank 9 through the return flow channel 19. It can be seen that the flow direction of the coolant in the hub housing 7 is from the end away from the motor 3 to the end of the motor 3. This direction is opposite to the air flow direction in the duct 1. This is conducive to eliminating the temperature gradient of the hub housing 7 and making the temperature of the motor 3 more uniform after heat dissipation.

[0037] Specifically, the support rib 6 is streamlined to reduce wind resistance and is a hollow sandwich structure, wherein a through-hole 27 is provided in the hollow part for arranging power cables and control cables, etc., and a through-hole 27 is also provided in the corresponding place on the hub shell 7. A second coolant flow channel unit 20 is provided in the sandwich part, and the second coolant flow channel unit 20 includes a vertical radial flow channel 21 and a horizontal converging flow channel 22. Figure 7 and 8 As shown, radial channels 21 symmetrical about the central axis of the support rib 6 are provided on both sides of the support rib 6, and the radial channels 21 are provided along the length direction of the support rib 6. The radial channels 21 on one side are connected with the axial flow channel 18, and the radial channels 21 on the other side are connected with the return channel 19. A third opening 25 is provided at the connection between the radial channels 21 and the axial flow channel 18 and the return channel 19 on the support rib 6. A converging channel 22 is provided at one end of the support rib 6 away from the hub housing 7, and the radial channels 21 on both sides of the support rib 6 are connected with the converging channel 22, so that the coolant flows out of the axial flow channel 18 and enters the radial channel 21 connected thereto, and flows into the radial channel 21 on the other side after passing through the converging channel 22.

[0038] Specifically, in order to strengthen the seal between the support rib 6 and the hub shell 7, a sealing groove 26 can be set on the contact surface between the support rib 6 and the hub. The sealing groove 26 is set along the edge of the cross section of the support rib 6 and is designed around the periphery of the radial flow channel 21 to wrap the radial flow channel 21 within the contour line of the sealing groove 26.

[0039] Embodiment 2

[0040] See attached Fig. 9 The coolant of the liquid cooling mechanism 8 of the present invention can also cool down and dissipate heat for the concentrated heating device 34 disposed inside the hub. In this case, it is only necessary to lead a connecting pipe 33 from the coolant outlet 10 or the outlet of the circulating pump 12, and guide the coolant to the concentrated heating device 34 through the connecting pipe 33 to dissipate heat for the device. Fig. 9 shown.

[0041] All technical features in this embodiment can be freely combined according to actual needs. The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be covered by the scope of the claims of the present invention. The technology, shape, and structural parts not described in detail in the present invention are all well-known technologies.

[0042] The above embodiments are preferred implementation schemes of the present invention. In addition, other implementation schemes are also included. Any obvious replacement without departing from the concept of the present technical scheme is within the protection scope of the present invention.

Claims

1. A liquid cooling duct fan, characterized in that: The invention comprises a duct (1), a propeller, a motor (3), a supporting rib (6), a hub shell (7) and a liquid cooling mechanism (8); the hub shell (7) is fixed in the duct (1) through the supporting rib (6); the hub shell (7) is provided with a motor (3) and a liquid cooling mechanism (8); the rotor output shaft of the motor (3) is connected to the propeller and a fairing (5) through a coupling (4); the fairing (5) is sleeved on the propeller and is provided with an opening to allow the blades (2) of the propeller to extend out; the liquid cooling mechanism (8) is at least partially formed inside the hub shell (7) and the supporting rib (6), wherein the hub shell (7) and the supporting rib (6) are a sandwich structure to form a cooling liquid circulation channel of the liquid cooling mechanism (8).

2. The liquid cooling duct fan according to claim 1, characterized in that: The liquid cooling mechanism (8) comprises a liquid storage tank (9) and a cooling liquid flow channel (13); a liquid storage tank (9) is provided on one side of the motor (3) in the hub shell (7); a cooling liquid outlet (10) and a cooling liquid inlet (11) are respectively provided on the liquid storage tank (9); the hub shell (7) and the supporting ribs (6) are both provided with a communicating cooling liquid flow channel (13); the cooling liquid outlet (10) and the cooling liquid inlet (11) are respectively connected to the cooling liquid flow channel (13) in the hub shell (7) through pipelines.

3. The liquid cooling duct fan according to claim 2, characterized in that: The coolant flow channel (13) comprises a first coolant flow channel unit (14) and a second coolant flow channel unit (20); the first coolant flow channel unit (14) is arranged in the hub shell (7); the coolant outlet (10) and the coolant inlet (11) are respectively connected to the first coolant flow channel unit (14); the second coolant flow channel unit (20) is arranged in the supporting rib (6); the second coolant flow channel unit (20) is connected to the first coolant flow channel unit (14).

4. The liquid cooling duct fan according to claim 3, characterized in that: The first coolant flow channel unit (14) comprises an annular branch flow channel (15), a radial branch flow channel (16), an axial converging cavity (17) and an axial branch flow channel (18); the annular branch flow channel (15) is connected to the coolant outlet (10); the coolant in the liquid storage tank (9) flows from the coolant outlet (10) into the annular branch flow channel (15), and then passes through the radial branch flow channel (16), the axial converging cavity (17) and the axial branch flow channel (18) in sequence, and finally dispersed into the hub shell (7) corresponding to the motor (3) through the axial branch flow channel (18), so as to cool the motor (3).

5. The liquid cooling duct fan according to claim 4, characterized in that: The first coolant flow channel unit (14) further comprises a return flow channel (19); one end of the second coolant flow channel unit (20) is connected to the axial branch flow channel (18), and the other end is connected to the return flow channel (19); the coolant in the axial branch flow channel (18) flows out and enters the second coolant flow channel unit (20) for self-heat dissipation, and then flows back to the liquid storage tank (9) from the return flow channel (19).

6. The liquid cooling duct fan according to claim 5, characterized in that: The second coolant flow channel unit (20) comprises a vertical radial flow channel (21) and a transverse converging flow channel (22); radial flow channels (21) symmetrical about the central axis of the support rib (6) are respectively provided on both sides of the support rib (6), the radial flow channel (21) on one side is connected to the axial branch flow channel (18), and the radial flow channel (21) on the other side is connected to the return flow channel (19); a converging flow channel (22) is provided at one end of the support rib (6) away from the hub shell (7), and the radial flow channels (21) on both sides of the support rib (6) are connected via the converging flow channel (22).

7. The liquid cooling duct fan according to claim 3, characterized in that: The liquid cooling mechanism (8) further comprises a circulation pump (12); a circulation pump (12) is provided at the bottom of the liquid storage tank (9); an outlet of the circulation pump (12) is connected to a coolant outlet (10) via a pipeline to drive the coolant in the liquid storage tank (9) to circulate in a coolant flow channel (13) in the hub shell (7) and the supporting rib plate (6).

8. The liquid cooling duct fan according to claim 6, characterized in that: A sealing groove (26) is provided on the contact surface between the supporting rib (6) and the hub shell (7); the sealing groove (26) is arranged around the radial flow channel (21); and a sealing ring is provided in the sealing groove (26).

9. The liquid cooling duct fan according to claim 1, characterized in that: The supporting rib plate (6) is a hollow sandwich structure, and a through-hole (27) is provided inside.

10. The liquid cooling duct fan according to claim 1, characterized in that: A heat-conducting layer is provided on the contact surface between the stator of the motor (3) and the hub housing (7).

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