Spiral-polyflow combined ducted motor cooling device

Abstract

The present application belongs to the technical field of electric propulsion and motor design, and particularly relates to a ducted motor cooling device combined with spiral-polyflow structure, comprising: a rotor, a shaft, a motor, a cycloidal rotor pump, a polyflow structure, a first spiral pipeline and a second spiral pipeline; the polyflow structure is arranged axially on the motor shell to cool the motor body and heat-exchange the circulating oil, and the polyflow structure can increase the slip flow speed on the surface of the motor to improve the cooling and heat-exchange efficiency. The polyflow structure of the present application is composed of a cooling fin and a polyflow shell, and the polyflow shell is similar to a duct, which can well realize the polyflow effect. The present application designs a spiral structure between the motor and the propeller, prolongs the circulating oil path, directly utilizes the slip flow behind the propeller for heat exchange, and the added structure is simple and small in size.

Description

Technical Field

[0001] This invention belongs to the field of electric propulsion technology and motor design technology, specifically relating to a ducted motor cooling device combining a spiral-converging structure. Background Technology

[0002] With the rapid development of urban three-dimensional transportation and the low-altitude economy, flying cars that integrate ground driving and vertical takeoff and landing capabilities have become a key technological direction for solving traffic congestion and expanding travel options. These land-air mobility platforms rely on high-power-density propulsion motors to achieve compact electric ducted motor power systems. However, under high-current conditions, the copper losses in the windings surge, leading to significant temperature rise issues. 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 one of the core technological bottlenecks restricting 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 an integrated air-cooling system for ducted fan electric propulsion. By installing the liquid storage part in the duct body, the heat dissipation problem of the motor is solved by air cooling. However, this method cannot effectively remove the temperature of the motor windings and cannot solve the problems of local highest temperature points and uneven heat distribution in the windings.

[0004] Chinese invention patents CN119408718A and CN119324600A propose a high-heat-dissipation, integrated ducted fan electric propulsion system and a highly integrated, efficient cooling external rotor motor ducted fan. The ducted fan is placed inside the motor housing via a water-cooling circuit to cool the motor. The motor can also be cooled by an air-cooled radiator composed of a duct nacelle and duct stator blades. However, the separately installed water-cooling chamber is located at the rear of the motor, resulting in poor heat exchange. Furthermore, the mixed air-water cooling method cannot effectively dissipate heat from the motor, and the radiator has low heat exchange efficiency.

[0005] Chinese invention patent CN117833559A proposes an integrated propeller-generator-cooling electric propulsion system. While this system uses an external electromagnetic pump to circulate the coolant, arranging heat sinks on multiple arms significantly increases weight and severely impacts the duct's aerodynamic characteristics. Furthermore, the electromagnetic pump, being a pump that directs current-carrying fluid in a magnetic field under electromagnetic force, requires a separate electromagnetic component. The motor's cooling pipe fabrication also presents challenges due to equipment limitations, poor versatility, and complex interface installation between the motor and the duct arm's cooling circuit. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] The technical problem to be solved by this invention is: how to improve the cooling efficiency of the motor, reduce the weight of the motor, and minimize the addition of extra electromagnetic drive components, while ensuring that the structure of the motor has little impact on the aerodynamic performance of the duct / propeller.

[0008] (II) Technical Solution

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

[0010] like Figure 5 As shown, a current-concentrating structure 5 is fixed to the outer side of the motor 3 housing. The current-concentrating structure 5 includes: a heat sink 51 and a current-concentrating structure housing 52. The inner and outer sides of the heat sink 51 are respectively fixedly connected to the outer side of the motor 3 housing and the inner side of the current-concentrating structure housing 52. The current-concentrating structure housing 52 is a circular duct structure. In the direction from the rotor 1 to the motor 3 along the axis of the shaft 2, the current-concentrating structure housing 52 is set to have a radial dimension that gradually narrows to better concentrate current.

[0011] The first spiral pipe 6 is arranged on the side of the motor 3 housing near the rotor 1 and is fixedly arranged coaxially 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 introduce 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 outer wall of the motor 3. One end is the oil inlet 71 of the second spiral pipe, which communicates with the inner cavity of the motor 3 and is used to draw out the cooling oil from the inner cavity of the motor 3. The other end is the oil outlet 72 of the second spiral pipe, which is connected to the oil inlet 61 of the first spiral pipe 6, so that the second spiral pipe 7 is connected to the first spiral pipe 6.

[0013] The cycloidal rotor pump 4 is fixed on the shaft 2 and rotates together with the shaft 2, such as Figure 3As shown; the cycloidal rotor pump 4 includes an inner rotor 41, an outer rotor 42, a rotor pump housing 43, a rotor pump inlet 44, and a rotor pump outlet 45; the inner rotor 41 is coaxially fixed with the shaft 2; the outer rotor 42 and the rotor pump housing 43 are coaxial and are eccentrically fixed with the shaft 2; the rotor pump inlet 44 and the rotor pump outlet 45 are symmetrically arranged on the rotor pump housing 43 and connected to the external first spiral pipe 6, so that the hydraulic negative pressure generated when the cycloidal rotor pump 4 is working is applied to the first spiral pipe 6 through the rotor pump inlet 44, and then through the connection 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 draws in the cooling oil of the inner cavity of the motor 3 through the second spiral pipe inlet 71.

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

[0015] Then, the cooling oil is pumped out from the cycloidal rotor pump 4, enters the first spiral pipe 6 through the rotor pump outlet 45, and enters the inner cavity of the motor 3 from the first spiral pipe 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 generates a high-speed, low-temperature airflow during rotation;

[0017] Part of the airflow passes through the first spiral pipe 6, carrying away the heat in the first spiral pipe 6;

[0018] Part of the airflow flows through the converging structure 5, carrying away the heat in the second spiral pipe 7, thus achieving dual cooling of the cooling oil.

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

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

[0021] The rotor housing 311 has a plurality of rotor housing protrusions 312 evenly arranged on its circumferential edge. The rotor housing protrusions 312 match the recesses on the inner wall of the motor housing 3, so as to achieve mutual fixed connection.

[0022] Among them, the rotor outer shell 311 is a hollow cylindrical sleeve with an internal hollowing out.

[0023] Among them, there are 4 protruding structures 312 on the rotor housing.

[0024] Among them, several heat sinks 51 are arranged in a circumferential array on the outer side of the motor 3 housing, which together with the converging structure housing 52 form the converging structure 5.

[0025] The heat sink 51 has 180 units.

[0026] (III) Beneficial Effects

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

[0028] (1) The present invention provides a flow-concentrating structure in the axial direction of the motor housing to dissipate heat from the motor body and exchange heat with the circulating oil. The flow-concentrating structure can increase the sliding velocity on the surface of the motor, thereby improving the heat dissipation and heat exchange efficiency.

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

[0030] (3) The present invention designs a spiral structure between the motor and the propeller, which extends the circulating oil path and can directly utilize the slip flow behind the propeller for sufficient heat exchange. The added structure is simple and small in size.

[0031] (4) This invention designs a rotor pump, which uses the rotation of the motor rotor to realize the circulation of oil in the motor internal circuit, eliminating the need for complex oil pumping devices such as oil pumps and electromagnetic pumps, and can automatically adjust the oil circulation speed according to the rotation speed of the rotor. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a ducted motor cooling device combining a spiral-converging structure according to the present invention.

[0033] Figure 2 This is a schematic diagram of a cycloidal rotor pump, a motor, and a flow-concentrating structure combined with a spiral-flow-concentrating structure, which is a cooling device for a ducted motor according to the present invention.

[0034] Figure 3 This is a schematic diagram of a cycloidal rotor pump for a ducted motor cooling device combining a spiral-converging structure according to the present invention.

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

[0036] Figure 5 This is a cross-sectional view of a ducted motor cooling device combining a spiral-converging 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. Cycloidal rotor pump, 41. Inner rotor, 42. Outer rotor, 43. Rotor pump housing, 44. Rotor pump inlet, 45. Rotor pump outlet, 5. Converging structure, 51. Heat sink, 52. Converging structure housing, 6. First spiral pipe, 61. First spiral pipe inlet, 62. First spiral pipe outlet, 7. First spiral pipe, 71. Second spiral pipe inlet, 72. Second spiral pipe outlet. Detailed Implementation

[0039] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0040] To improve motor cooling efficiency, reduce motor weight, and minimize the addition of extra electromagnetic drive components, while also minimizing the impact of the motor structure on the aerodynamic performance of the duct / propeller, this invention proposes a ducted motor cooling device combining a spiral-converging structure. By arranging a converging structure around the motor circumferentially, the high-speed slipflow of the ducted propeller is utilized to dissipate heat from the motor body and exchange heat with the circulating oil. A spiral structure is designed between the motor and propeller to increase the circulation oil path and heat exchange area, rapidly cooling the high-temperature oil output from the motor.

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

[0042] like Figure 5 As shown, a current-concentrating structure 5 is fixed to the outer side of the motor 3 housing. The current-concentrating structure 5 includes: a heat sink 51 and a current-concentrating structure housing 52. The inner and outer sides of the heat sink 51 are respectively fixedly connected to the outer side of the motor 3 housing and the inner side of the current-concentrating structure housing 52. The current-concentrating structure housing 52 is a circular duct structure. In the direction from the rotor 1 to the motor 3 along the axis of the shaft 2, the current-concentrating structure housing 52 is set to have a radial dimension that gradually narrows to better concentrate current.

[0043] The first spiral pipe 6 is arranged on the side of the motor 3 housing near the rotor 1 and is fixedly arranged coaxially 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 introduce 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 outer wall of the motor 3. One end is the oil inlet 71 of the second spiral pipe, which communicates with the inner cavity of the motor 3 and is used to draw out the cooling oil from the inner cavity of the motor 3. The other end is the oil outlet 72 of the second spiral pipe, which is connected to the oil inlet 61 of the first spiral pipe 6, so that the second spiral pipe 7 is connected to the first spiral pipe 6.

[0045] The cycloidal rotor pump 4 is fixed on the shaft 2 and rotates together with the shaft 2, such as Figure 3 As shown; the cycloidal rotor pump 4 includes an inner rotor 41, an outer rotor 42, a rotor pump housing 43, a rotor pump inlet 44, and a rotor pump outlet 45; the inner rotor 41 is coaxially fixed with the shaft 2; the outer rotor 42 and the rotor pump housing 43 are coaxial and are eccentrically fixed with the shaft 2; the rotor pump inlet 44 and the rotor pump outlet 45 are symmetrically arranged on the rotor pump housing 43 and connected to the external first spiral pipe 6, so that the hydraulic negative pressure generated when the cycloidal rotor pump 4 is working is applied to the first spiral pipe 6 through the rotor pump inlet 44, and then through the connection 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 draws in the cooling oil of the inner cavity of the motor 3 through the second spiral pipe inlet 71.

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

[0047] Then, the cooling oil is pumped out from the cycloidal rotor pump 4, enters the first spiral pipe 6 through the rotor pump outlet 45, and enters the inner cavity of the motor 3 from the first spiral pipe 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 generates a high-speed, low-temperature airflow during rotation;

[0049] Part of the airflow passes through the first spiral pipe 6, carrying away the heat in the first spiral pipe 6;

[0050] Part of the airflow flows through the converging structure 5, carrying away the heat in the second spiral pipe 7, thus achieving dual cooling of the cooling oil.

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

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

[0053] The rotor housing 311 has a plurality of rotor housing protrusions 312 evenly arranged on its circumferential edge. The rotor housing protrusions 312 match the recesses on the inner wall of the motor housing 3, so as to achieve mutual fixed connection.

[0054] Among them, the rotor outer shell 311 is a hollow cylindrical sleeve with an internal hollowing out.

[0055] Among them, there are 4 protruding structures 312 on the rotor housing.

[0056] Among them, several heat sinks 51 are arranged in a circumferential array on the outer side of the motor 3 housing, which together with the converging structure housing 52 form the converging structure 5.

[0057] The heat sink 51 has 180 units.

[0058] The heat dissipation structure, which involves adding a current-concentrating structure to the motor housing, is within the scope of protection of this invention.

[0059] The structure and method of using a rotor pump to drive the circulation of stator oil are both within the scope of protection of this invention.

[0060] The cooling structure that improves heat exchange efficiency by using an external spiral oil channel is within the protection scope of this invention.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A ducted motor cooling device combining a spiral-converging structure, characterized in that, The ducted motor cooling device includes: a rotor (1), a shaft (2), a motor (3), a cycloidal 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 cycloidal rotor pump (4) are coaxially fixed on the shaft (2); A current-gathering structure (5) is fixed on the outer side of the motor (3) housing. The current-gathering structure (5) includes: a heat sink (51) and a current-gathering structure housing (52). The inner and outer sides of the heat sink (51) are respectively fixedly connected to the outer side of the motor (3) housing and the inner side of the current-gathering structure housing (52). The current-gathering structure housing (52) is a circular duct structure. Along the axis of the shaft (2) from the rotor (1) toward the motor (3), the current-gathering structure housing (52) is set to have a radial dimension that changes from wide to narrow to better gather current. The first spiral pipe (6) is arranged on the side of the motor (3) housing near the rotor (1) and is fixedly arranged coaxially 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 introduce 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 wall of the motor (3). One end is the oil inlet (71) of the second spiral pipe, which communicates with the inner cavity of the motor (3) and is used to draw out the cooling oil from the inner cavity of the motor (3). The other end is the oil outlet (72) of the second spiral pipe, which is connected to the oil inlet (61) of the first spiral pipe (6), so that the second spiral pipe (7) and the first spiral pipe (6) are connected. The cycloidal rotor pump (4) is fixed on the shaft (2) and rotates together with the shaft (2); the cycloidal rotor pump (4) includes an inner rotor (41), an outer rotor (42), a rotor pump housing (43), a rotor pump inlet (44), and a rotor pump 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 are eccentrically fixed together with the shaft (2); the rotor pump inlet (44) and the rotor pump 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 when the cycloidal rotor pump (4) is working is applied to the first spiral pipe (6) through the rotor pump inlet (44), and then through the connection 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 draws in the cooling oil of the motor (3) cavity through the second spiral pipe inlet (71).

2. The ducted motor cooling device with a spiral-converging structure as described in claim 1, characterized in that, When working, the motor (3) is powered on and the shaft (2) rotates, driving the rotor (1) and the cycloidal rotor pump (4) to rotate together; the cycloidal rotor pump (4) draws the cooling oil in the inner cavity of the motor (3) out from the oil inlet (71) of the second spiral pipe, through the second spiral pipe (7), out from the oil outlet (72) of the second spiral pipe and into the first spiral pipe (6) through the oil inlet (61) of the first spiral pipe, and then into the cycloidal rotor pump (4) through the oil inlet (44) of the rotor pump; Then, the cooling oil is pumped out from the cycloidal rotor pump (4), enters the first spiral pipe (6) through the rotor pump outlet (45), and enters the motor (3) cavity from the first spiral pipe 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.

3. The ducted motor cooling device with a spiral-converging structure as described in claim 1, characterized in that, The rotor (1) rotates to generate a high-speed, low-temperature airflow; Part of the airflow passes through the first spiral pipe (6), carrying away the heat in the first spiral pipe (6); Part of the airflow flows through the converging structure (5), carrying away the heat in the second spiral pipe (7) to achieve dual cooling of the cooling oil.

4. The ducted motor cooling device with a spiral-converging structure as described in claim 1, characterized in that, The motor (3) includes a rotor (31) and a stator (32); The rotor (31) is coaxially mounted with a rotor housing (311) on the outside, which is dynamically sealed with the shaft (2) to isolate the rotor (31) from the inner cavity of the motor (3); The rotor housing (311) has a plurality of rotor housing protrusions (312) evenly arranged on its circumferential edge. The rotor housing protrusions (312) match the recesses on the inner wall of the motor housing (3) to achieve mutual fixed connection.

5. The ducted motor cooling device with a spiral-converging structure as described in claim 4, characterized in that, The rotor housing (311) is a hollow cylindrical sleeve with an internal hollowing out.

6. The ducted motor cooling device with a spiral-converging structure as described in claim 4, characterized in that, The rotor housing has four protruding structures (312).

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

8. The ducted motor cooling device with a spiral-converging structure as described in claim 7, characterized in that, The heat sink (51) is provided with 180 units.

9. The ducted motor cooling device with a spiral-converging structure as described in claim 1, characterized in that, The cooling device dissipates heat from the motor body and exchanges heat with the circulating oil by setting a flow-concentrating structure in the axial direction of the motor housing. The flow-concentrating structure can increase the sliding velocity on the motor surface, thereby improving the heat dissipation and heat exchange efficiency.

10. The ducted motor cooling device with a spiral-converging structure as described in claim 1, characterized in that, The cooling device features a spiral structure between the motor and the propeller, which extends the circulating oil path and allows for efficient heat exchange by directly utilizing the slip flow behind the propeller. The added structure is simple and compact.

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