Spiral-conflux structure combined duct motor cooling device

Abstract

The invention belongs to the technical field of electric propulsion technology and motor design, and particularly relates to a spiral-conflux structure combined ducted motor cooling device which comprises a rotor wing, a shaft, a motor, a cycloid rotor pump, a conflux structure, a first spiral pipeline and a second spiral pipeline. The flow gathering structure is axially arranged on the motor shell, the motor body is cooled, heat exchange is conducted on circulating oil liquid, the slip flow speed of the surface of the motor can be increased through the arrangement of the flow gathering structure, and the heat dissipation and heat exchange efficiency is improved. The flow gathering structure is composed of the cooling fins and the flow gathering shell, the flow gathering shell is similar to a duct, and the flow gathering effect can be well achieved. A spiral structure is designed between the motor and the propeller, a circulating oil way is prolonged, slip flow behind the propeller can be directly utilized for sufficient heat exchange, and the additionally arranged structure is simple and small in size.

Description

Technical Field

[0001] The present invention belongs to the field of electric propulsion technology and motor design technology, and specifically relates to a ducted motor cooling device combining a spiral-convergent structure. Background Art

[0002] With the accelerated development of urban multi-dimensional transportation and the low-altitude economy, flying cars that combine ground travel with vertical takeoff and landing capabilities have become a key technological direction for resolving traffic congestion and expanding mobility. These land-to-air mobility platforms rely on high-power-density propulsion motors to implement compact electric ducted propulsion systems. However, high-current operation leads to a surge in winding copper loss, resulting in significant temperature rise. In high-load scenarios with frequent takeoffs and landings, traditional heat dissipation technologies struggle to balance the dual demands of increased power density and optimized thermal management, becoming a core technical bottleneck hindering the commercialization of flying cars.

[0003] Chinese invention patents CN117639360A and CH117318382A respectively provide a composite heat dissipation device and method, a ducted fan, and integrated air cooling of a ducted fan electric propulsion system. By installing the liquid storage part in the duct body, the motor heat dissipation problem is solved by air cooling. However, this method cannot effectively bring out the temperature of the motor winding, and cannot solve the problems of the highest local temperature point of the winding and uneven heat.

[0004] Chinese invention patents CN119408718A and CN119324600A propose a high-heat dissipation, integrated ducted fan electric propulsion system and a highly integrated, efficient cooling outer rotor motor ducted fan. This system cools the motor via a water cooling circuit placed within the motor housing. The motor can also be cooled by an air-cooled radiator consisting of a ducted nacelle and ducted stators. However, the separately installed water-cooling chamber is located behind the motor, resulting in poor heat transfer. Furthermore, the combined air and water cooling method cannot effectively dissipate heat from the motor, and the radiator has low heat transfer efficiency.

[0005] Chinese invention patent CN117833559A proposes an integrated propeller-generator-heat sink electric propulsion system. This system circulates the coolant via an external electromagnetic pump. Placing heat sinks on multiple arms would significantly increase weight and severely impact the aerodynamic characteristics of the duct. Furthermore, an electromagnetic pump, which directs the flow of current through a magnetic field under the influence of electromagnetic force, requires a separate electromagnetic component. The motor cooling circuit requires equipment considerations, resulting in limited versatility. Furthermore, the cooling circuit interface between the motor and the duct arm is complex to install. Summary of the Invention

[0006] (1) Technical issues to be solved

[0007] The technical problem to be solved by the present invention is: how to improve the cooling efficiency of the motor, reduce the weight of the motor, and try not to add additional electromagnetic drive components, while at the same time achieving a motor structure that has little impact on the aerodynamic performance of the duct / propeller.

[0008] (2) Technical solution

[0009] In order to solve the above technical problems, the present invention provides a ducted motor cooling device combining a spiral-flow converging structure, such as Figure 1-Figure 2 As shown, the ducted motor cooling device includes: a rotor 1, a shaft 2, a motor 3, a cycloid rotor pump 4, a flow concentrating structure 5, a first spiral pipe 6, and a second spiral pipe 7; wherein the rotor 1, the motor 3 and the cycloid rotor pump 4 are coaxially fixed on the shaft 2;

[0010] like Figure 5 As shown, a flow converging structure 5 is fixed to the outside of the motor 3 housing. The flow converging structure 5 includes a heat sink 51 and a flow converging structure housing 52. The inner and outer sides of the heat sink 51 are fixedly connected to the outer side of the motor 3 housing and the inner side of the flow converging structure housing 52, respectively. The flow converging structure housing 52 is an annular duct structure. In the direction from the rotor 1 toward the motor 3 along the axis of the shaft 2, the flow converging structure housing 52 is configured to have a radial dimension that gradually narrows from wide to narrow, thereby better converging the flow.

[0011] The first spiral pipe 6 is arranged on a side of the motor 3 housing close to the rotor 1 and is coaxially fixed with the motor 3. The first spiral pipe 6 includes a first spiral pipe oil inlet 61 and a first spiral pipe oil outlet 62. The first spiral pipe oil outlet 62 communicates with the inner cavity of the motor 3 and is used to guide the cooling oil in the first spiral pipe 6 into the inner cavity of the motor 3.

[0012] The second spiral pipe 7 is arranged inside the housing wall of the motor 3, with one end being a second spiral pipe oil inlet 71, which communicates with the inner cavity of the motor 3 and is used to suck out the cooling oil from the inner cavity of the motor 3, and the other end being a second spiral pipe oil outlet 72 connected to the first spiral pipe oil inlet 61 of the first spiral pipe 6, so that the second spiral pipe 7 is in communication with the first spiral pipe 6;

[0013] The cycloid rotor pump 4 is fixed on the shaft 2 and rotates together with the shaft 2. Figure 3As shown; the cycloid rotor pump 4 includes an inner rotor 41, an outer rotor 42, a rotor pump housing 43, a rotor pump oil inlet 44, and a rotor pump oil outlet 45; the inner rotor 41 is coaxially fixed to the shaft 2; the outer rotor 42 and the rotor pump housing 43 are coaxial and are eccentrically fixed to the shaft 2; the rotor pump oil inlet 44 and the rotor pump oil outlet 45 are symmetrically arranged on the rotor pump housing 43 and are connected to the external first spiral pipe 6, so that the hydraulic negative pressure generated when the cycloid rotor pump 4 is working acts on the first spiral pipe 6 through the rotor pump oil inlet 44, and then through the communication relationship between the first spiral pipe 6 and the second spiral pipe 7, the negative pressure continues to act on the second spiral pipe 7, and the second spiral pipe 7 then realizes the suction of cooling oil into the inner cavity of the motor 3 through the second spiral pipe oil inlet 71.

[0014] During operation, the motor 3 is powered on and the shaft 2 rotates, driving the rotor 1 and the cycloid rotor pump 4 to rotate together; the cycloid rotor pump 4 sucks the cooling oil in the inner cavity of the motor 3 out of the second spiral pipe oil inlet 71, passes through the second spiral pipe 7, flows out from the second spiral pipe oil outlet 72, and enters the first spiral pipe 6 from the first spiral pipe oil inlet 61, and then enters the cycloid rotor pump 4 through the rotor pump oil inlet 44;

[0015] Then, the cooling oil is pumped out from the cycloid rotor pump 4, enters the first spiral pipe 6 through the rotor pump oil outlet 45, and enters the inner cavity of the motor 3 from the first spiral pipe oil outlet 62 to complete the entire oil circuit circulation, realizing the circulation of the internal oil circuit of the motor by utilizing the rotation of the motor rotor.

[0016] The rotor 1 rotates to generate high-speed, low-temperature airflow;

[0017] Part of the airflow flows through the first spiral pipe 6 to take away the heat in the first spiral pipe 6;

[0018] Part of the airflow flows through the flow-converging structure 5 and takes away the heat in the second spiral pipe 7, thereby achieving double cooling of the cooling oil.

[0019] The motor 3 includes a rotor 31 and a stator 32. Figure 5 As shown;

[0020] The rotor 31 is coaxially mounted with a rotor housing 311 on the outside thereof, which is dynamically sealed with the shaft 2 to isolate the rotor 31 from the inner cavity of the motor 3;

[0021] A plurality of rotor housing protrusion structures 312 are evenly arranged on the circumferential edge of the rotor housing 311 , and the rotor housing protrusion structures 312 match the recessed portions of the inner wall of the motor 3 housing to achieve a fixed connection with each other.

[0022] The rotor housing 311 is a hollow cylindrical sleeve.

[0023] There are four protruding structures 312 on the rotor housing.

[0024] There are a number of heat sinks 51 arranged in a circumferential array outside the housing of the motor 3 , and together with the housing 52 of the flow converging structure, they form a flow converging structure 5 .

[0025] There are 180 heat sinks 51 .

[0026] (3) Beneficial effects

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] (1) The present invention dissipates heat from the motor body and exchanges heat with the circulating oil by arranging a flow-gathering structure in the axial direction of the motor housing. The arrangement of the flow-gathering structure can increase the slip flow velocity on the motor surface and improve the heat dissipation and heat exchange efficiency.

[0029] (2) The flow-gathering structure of the present invention is composed of heat dissipation fins and a flow-gathering shell. The flow-gathering shell is similar to a duct and can well achieve the flow-gathering effect.

[0030] (3) The present invention designs a spiral structure between the motor and the propeller to extend the circulating oil circuit and can directly utilize the slipstream behind the propeller for sufficient heat exchange. In addition, the additional structure is simple and small in size.

[0031] (4) The present invention designs a rotor pump and utilizes the rotation of the motor rotor to realize the circulation of the oil circuit inside the motor, eliminating complex oil pumping devices such as oil pumps and electromagnetic pumps, and can automatically adjust the oil circuit circulation speed according to the rotation speed of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of a ducted motor cooling device combining a spiral-flow converging structure according to the present invention;

[0033] Figure 2 This is a schematic diagram of a cycloid rotor pump, motor and flow-converging structure of a ducted motor cooling device combining a spiral-flow-converging structure according to the present invention;

[0034] Figure 3 A schematic diagram of a cycloid rotor pump in a ducted motor cooling device combining a spiral-flow converging structure according to the present invention;

[0035] Figure 4 A schematic diagram of a rotor of a ducted motor cooling device combining a spiral-convergent structure according to the present invention;

[0036] Figure 5 A cross-sectional view of a ducted motor cooling device combining a spiral and converging flow structure according to the present invention;

[0037] In the picture:

[0038] 1 Rotor, 2 Shaft, 3 Motor, 31 Rotor, 311 Rotor Housing, 312 Rotor Housing Protrusion Structure, 32 Stator, 4 Cycloid Rotor Pump, 41 Inner Rotor, 42 Outer Rotor, 43 Rotor Pump Housing, 44 Rotor Pump Oil Inlet, 45 Rotor Pump Oil Outlet, 5 Converging Structure, 51 Heat Sink, 52 Converging Structure Housing, 6 First Spiral Pipe, 61 First Spiral Pipe Oil Inlet, 62 First Spiral Pipe Oil Outlet, 7 First Spiral Pipe, 71 Second Spiral Pipe Oil Inlet, 72 Second Spiral Pipe Oil Outlet. DETAILED DESCRIPTION

[0039] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings and examples.

[0040] To improve motor cooling efficiency, reduce motor weight, minimize the addition of additional electromagnetic drive components, and minimize the impact of the motor structure on the aerodynamic performance of the duct / propeller, this invention proposes a ducted motor cooling device that combines a spiral and converging flow structure. By arranging a converging flow structure around the motor's circumference, it utilizes the high-speed slipstream of the ducted propeller to dissipate heat from the motor body and exchange heat with the circulating oil. By designing a spiral structure between the motor and propeller, the circulating oil path is lengthened, and the heat exchange area is increased, rapidly cooling the high-temperature oil output from the motor.

[0041] In order to solve the above technical problems, the present invention provides a ducted motor cooling device combining a spiral-flow converging structure, such as Figure 1-Figure 2 As shown, the ducted motor cooling device includes: a rotor 1, a shaft 2, a motor 3, a cycloid rotor pump 4, a flow concentrating structure 5, a first spiral pipe 6, and a second spiral pipe 7; wherein the rotor 1, the motor 3 and the cycloid rotor pump 4 are coaxially fixed on the shaft 2;

[0042] like Figure 5 As shown, a flow converging structure 5 is fixed to the outside of the motor 3 housing. The flow converging structure 5 includes a heat sink 51 and a flow converging structure housing 52. The inner and outer sides of the heat sink 51 are fixedly connected to the outer side of the motor 3 housing and the inner side of the flow converging structure housing 52, respectively. The flow converging structure housing 52 is an annular duct structure. In the direction from the rotor 1 toward the motor 3 along the axis of the shaft 2, the flow converging structure housing 52 is configured to have a radial dimension that gradually narrows from wide to narrow, thereby better converging the flow.

[0043] The first spiral pipe 6 is arranged on a side of the motor 3 housing close to the rotor 1 and is coaxially fixed with the motor 3. The first spiral pipe 6 includes a first spiral pipe oil inlet 61 and a first spiral pipe oil outlet 62. The first spiral pipe oil outlet 62 communicates with the inner cavity of the motor 3 and is used to guide the cooling oil in the first spiral pipe 6 into the inner cavity of the motor 3.

[0044] The second spiral pipe 7 is arranged inside the housing wall of the motor 3, with one end being a second spiral pipe oil inlet 71, which communicates with the inner cavity of the motor 3 and is used to suck out the cooling oil from the inner cavity of the motor 3, and the other end being a second spiral pipe oil outlet 72 connected to the first spiral pipe oil inlet 61 of the first spiral pipe 6, so that the second spiral pipe 7 is in communication with the first spiral pipe 6;

[0045] The cycloid rotor pump 4 is fixed on the shaft 2 and rotates together with the shaft 2. Figure 3 As shown; the cycloid rotor pump 4 includes an inner rotor 41, an outer rotor 42, a rotor pump housing 43, a rotor pump oil inlet 44, and a rotor pump oil outlet 45; the inner rotor 41 is coaxially fixed to the shaft 2; the outer rotor 42 and the rotor pump housing 43 are coaxial and are eccentrically fixed to the shaft 2; the rotor pump oil inlet 44 and the rotor pump oil outlet 45 are symmetrically arranged on the rotor pump housing 43 and are connected to the external first spiral pipe 6, so that the hydraulic negative pressure generated when the cycloid rotor pump 4 is working acts on the first spiral pipe 6 through the rotor pump oil inlet 44, and then through the communication relationship between the first spiral pipe 6 and the second spiral pipe 7, the negative pressure continues to act on the second spiral pipe 7, and the second spiral pipe 7 then realizes the suction of cooling oil into the inner cavity of the motor 3 through the second spiral pipe oil inlet 71.

[0046] During operation, the motor 3 is powered on and the shaft 2 rotates, driving the rotor 1 and the cycloid rotor pump 4 to rotate together; the cycloid rotor pump 4 sucks the cooling oil in the inner cavity of the motor 3 out of the second spiral pipe oil inlet 71, passes through the second spiral pipe 7, flows out from the second spiral pipe oil outlet 72, and enters the first spiral pipe 6 from the first spiral pipe oil inlet 61, and then enters the cycloid rotor pump 4 through the rotor pump oil inlet 44;

[0047] Then, the cooling oil is pumped out from the cycloid rotor pump 4, enters the first spiral pipe 6 through the rotor pump oil outlet 45, and enters the inner cavity of the motor 3 from the first spiral pipe oil outlet 62 to complete the entire oil circuit circulation, realizing the circulation of the internal oil circuit of the motor by utilizing the rotation of the motor rotor.

[0048] The rotor 1 rotates to generate high-speed, low-temperature airflow;

[0049] Part of the airflow flows through the first spiral pipe 6 to take away the heat in the first spiral pipe 6;

[0050] Part of the airflow flows through the flow-converging structure 5 and takes away the heat in the second spiral pipe 7, thereby achieving double cooling of the cooling oil.

[0051] The motor 3 includes a rotor 31 and a stator 32. Figure 5 As shown;

[0052] The rotor 31 is coaxially mounted with a rotor housing 311 on the outside thereof, which is dynamically sealed with the shaft 2 to isolate the rotor 31 from the inner cavity of the motor 3;

[0053] A plurality of rotor housing protrusion structures 312 are evenly arranged on the circumferential edge of the rotor housing 311 , and the rotor housing protrusion structures 312 match the recessed portions of the inner wall of the motor 3 housing to achieve a fixed connection with each other.

[0054] The rotor housing 311 is a hollow cylindrical sleeve.

[0055] There are four protruding structures 312 on the rotor housing.

[0056] There are a number of heat sinks 51 arranged in a circumferential array outside the housing of the motor 3 , and together with the housing 52 of the flow converging structure, they form a flow converging structure 5 .

[0057] There are 180 heat sinks 51 .

[0058] The heat dissipation structure of the motor housing provided by the present invention is within the protection scope of the present invention.

[0059] The structure and method of the present invention for driving the stator oil circulation by the rotor pump are both within the protection scope of the present invention.

[0060] The cooling structure of the present invention that improves the heat exchange efficiency by adopting external spiral oil channels is within the protection scope of the present invention.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A ducted motor cooling device combining a spiral and converging flow structure, characterized in that: The ducted motor cooling device comprises: a rotor (1), a shaft (2), a motor (3), a cycloid rotor pump (4), a flow converging structure (5), a first spiral pipe (6), and a second spiral pipe (7); wherein the rotor (1), the motor (3), and the cycloid rotor pump (4) are coaxially fixed on the shaft (2); A flow-gathering structure (5) is fixed on the outer side of the motor (3) housing, and the flow-gathering structure (5) comprises: a heat sink (51) and a flow-gathering structure housing (52); the inner side and the outer side of the heat sink (51) are fixedly connected to the outer side of the motor (3) housing and the inner side of the flow-gathering structure housing (52) respectively; the flow-gathering structure housing (52) is a circular duct structure, and in the direction from the rotor (1) toward the motor (3) along the axis of the shaft (2), the flow-gathering structure housing (52) is configured such that the radial dimension thereof becomes narrower from wide to narrow, so as to better achieve flow gathering; The first spiral pipe (6) is arranged on a side of the motor (3) housing close to the rotor (1) and is coaxially fixed with the motor (3); the first spiral pipe (6) comprises: a first spiral pipe oil inlet (61) and a first spiral pipe oil outlet (62); the first spiral pipe oil outlet (62) is in communication with the inner cavity of the motor (3) and is used to guide the cooling oil in the first spiral pipe (6) into the inner cavity of the motor (3); The second spiral pipe (7) is arranged inside the outer shell wall of the motor (3), one end of which is a second spiral pipe oil inlet (71) communicating with the inner cavity of the motor (3) and used to suck out the cooling oil from the inner cavity of the motor (3), and the other end of which is a second spiral pipe oil outlet (72) connected to the first spiral pipe oil inlet (61) of the first spiral pipe (6), so that the second spiral pipe (7) is in communication with the first spiral pipe (6); The cycloid rotor pump (4) is fixed on the shaft (2) and rotates together with the shaft (2); the cycloid rotor pump (4) includes an inner rotor (41), an outer rotor (42), a rotor pump housing (43), a rotor pump oil inlet (44), and a rotor pump oil outlet (45); the inner rotor (41) is fixed coaxially with the shaft (2); the outer rotor (42) and the rotor pump housing (43) are coaxial and fixed eccentrically to the shaft (2); the rotor pump oil inlet (44) and the rotor pump oil outlet (45) are symmetrically arranged on the rotor The pump housing (43) is connected to the external first spiral pipe (6), so that the hydraulic negative pressure generated by the cycloid rotor pump (4) when working acts on the first spiral pipe (6) through the rotor pump oil inlet (44), and then through the communication relationship between the first spiral pipe (6) and the second spiral pipe (7), the negative pressure continues to act on the second spiral pipe (7), and the second spiral pipe (7) then sucks the cooling oil into the inner cavity of the motor (3) through the second spiral pipe oil inlet (71).

2. The ducted motor cooling device with a spiral-flow converging structure as claimed in claim 1, characterized in that: During operation, the motor (3) is powered on and the shaft (2) rotates, driving the rotor (1) and the cycloid rotor pump (4) to rotate together; the cycloid rotor pump (4) sucks the cooling oil in the inner cavity of the motor (3) out of the second spiral pipe oil inlet (71), passes through the second spiral pipe (7), flows out from the second spiral pipe oil outlet (72), and enters the first spiral pipe (6) from the first spiral pipe oil inlet (61), and then enters the cycloid rotor pump (4) through the rotor pump oil inlet (44); Then, the cooling oil is pumped out from the cycloid rotor pump (4), enters the first spiral pipe (6) through the rotor pump oil outlet (45), and enters the inner cavity of the motor (3) from the first spiral pipe oil outlet (62) to complete the entire oil circuit circulation, thereby realizing the completion of the oil circuit circulation inside the motor by utilizing the rotation of the motor rotor.

3. The ducted motor cooling device with a spiral-flow converging structure as claimed in claim 1, characterized in that: The rotor (1) rotates to generate a high-speed, low-temperature airflow; Part of the airflow flows through the first spiral pipe (6) to take away the heat in the first spiral pipe (6); Part of the airflow flows through the converging structure (5) and takes away the heat in the second spiral pipe (7), thereby achieving double cooling of the cooling oil.

4. The ducted motor cooling device with a spiral-flow converging structure as claimed in claim 1, characterized in that: The motor (3) includes a rotor (31) and a stator (32); A rotor housing (311) is coaxially mounted on the outside of the rotor (31) and is dynamically sealed with the shaft (2) to isolate the rotor (31) from the inner cavity of the motor (3); A plurality of rotor housing protrusion structures (312) are evenly arranged on the circumferential edge of the rotor housing (311), and the rotor housing protrusion structures (312) match the recessed portions of the inner wall of the motor (3) housing to achieve a fixed connection with each other.

5. The ducted motor cooling device with a spiral-flow converging structure as claimed in claim 4, characterized in that: The rotor housing (311) is a hollow cylindrical sleeve with a hollow interior.

6. The ducted motor cooling device with a spiral-flow converging structure as claimed in claim 4, characterized in that: The number of the rotor housing protrusion structures (312) is four.

7. The ducted motor cooling device with a spiral-flow converging structure as claimed in claim 1, characterized in that: A plurality of heat sinks (51) are arranged in a circumferential array outside the motor (3) housing, and together with the flow converging structure housing (52) form a flow converging structure (5).

8. The ducted motor cooling device with a spiral-flow converging structure as claimed in claim 7, characterized in that: There are 180 heat sinks (51).

9. The ducted motor cooling device with a spiral-flow converging structure as claimed in claim 1, characterized in that: The cooling device dissipates heat from the motor body and exchanges heat with the circulating oil by arranging a flow-converging structure in the axial direction of the motor housing. The arrangement of the flow-converging structure can increase the slip flow velocity on the motor surface and improve the heat dissipation and heat exchange efficiency.

10. The ducted motor cooling device with a spiral-flow converging structure as claimed in claim 1, characterized in that: The cooling device is designed with a spiral structure between the motor and the propeller, which extends the circulating oil path and can directly utilize the slipstream behind the propeller for sufficient heat exchange. The additional structure is simple and small in size.

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