Air cooling structure of high-speed motor

Abstract

This utility model relates to an air cooling structure for a high-speed motor, which is applied in the field of high-speed motors. It includes a central shaft running through the motor body and a double-layered outer shell fitted over the central shaft. The double-layered outer shell includes an inner cover and an outer cover fixedly fitted over the inner cover. A gap is left between the inner and outer covers, and the inner wall of the inner cover has ventilation holes. Hot end caps and cold end caps are respectively fixedly connected to both ends of the double-layered outer shell by bolts. Cold air is introduced into the bearing of the hot end cap through the hollow central shaft and enters the hollow heat dissipation ring. Through a turbulence-inducing component, the airflow path and residence time of the cold air inside the hollow heat dissipation ring are increased, thereby allowing for sufficient heat exchange with the heated bearing. The air is then discharged into the double-layered outer shell through the vent holes, effectively preventing the bearing from operating at high temperatures for extended periods, thus effectively improving the stability of the motor during operation.

Description

Technical Field

[0001] This utility model relates to an air cooling structure, and more particularly to an air cooling structure for a high-speed motor applied in the field of high-speed motors. Background Technology

[0002] The integrated compressor-expander unit combines the compressor and expander onto a single rotor, eliminating the need for couplings, gearboxes, and other transmission mechanisms. This simplifies the main unit configuration and improves transmission efficiency. Furthermore, since the rotating parts are integrated within the same main unit housing, there is only a static seal, eliminating dynamic seals and enhancing the overall sealing reliability. Compared to traditional centrifugal compressors or turbine expanders, it offers significant advantages in terms of increased power density and operational reliability.

[0003] Because the compressor and expander are integrated on the same rotor, the operating conditions at both ends of the motor rotor are extremely cold at one end and extremely hot at the other. This results in an extremely uneven heat distribution at both ends of the motor, causing the bearing at the hot end to operate at high temperatures for a long time. Overheating of the bearing is one of the main causes of motor failure, which leads to increased wear and tear on the motor, increased frequency of damage, and serious impact on the stable operation of the motor.

[0004] The specification of Chinese Patent No. CN119393196A discloses a compression-expansion integrated machine, which has a sandwich layer designed on the outside of the motor section housing 12, and a cooling fluid is introduced into the sandwich layer to cool the motor section housing and the motor stator. However, this cooling fluid requires additional refrigeration costs, resulting in high cooling costs. Utility Model Content

[0005] The technical problem that this utility model aims to solve in view of the above-mentioned prior art is that because the compressor and expander are integrated on the same rotor, the temperature at the bearing of the hot end cover of the rotor is high, and the bearing operates at a high temperature for a long time, which seriously affects the stable operation of the motor.

[0006] To address the aforementioned problems, this utility model provides an air cooling structure for a high-speed motor, comprising a central shaft penetrating the motor body and a double-layered outer shell sleeved around the central shaft. The double-layered outer shell includes an inner cover and an outer cover fixedly sleeved outside the inner cover, with a gap between the inner and outer covers. Ventilation holes are formed in the inner wall of the inner cover. A hot end cap and a cold end cap are respectively bolted to both ends of the double-layered outer shell, and both are mounted on the outer surface of the central shaft via bearings. The central shaft is a hollow structure, and a shaft hole is formed at the outer end of the central shaft near the hot end cap. The inner ring of the hot end cap is provided with a hollow heat dissipation ring, which is sleeved on the outside of the bearing. The outer wall of the hollow heat dissipation ring is chiseled with multiple air guide holes, and the hollow heat dissipation ring is provided with a turbulence component. The turbulence component includes an inner tube fixedly connected to the circular inner wall of the hollow heat dissipation ring, which is movably sleeved on the outside of the central shaft. An outer tube is fixedly sleeved on the outer surface of the inner tube. Multiple air outlet grooves are chiseled on the outer surfaces of both the inner and outer tubes. A spiral blade is fixedly sleeved on the outer surface of the inner tube. A baffle is fixedly connected to the end of the inner tube away from the circular inner wall of the hollow heat dissipation ring, and multiple turbulence bands are fixedly connected to the end of the baffle close to the outer tube.

[0007] In the air cooling structure of the high-speed motor described above, cold air is introduced into the bearing of the hot end cover through the central shaft of the hollow structure and enters the hollow heat dissipation ring. Through the turbulence component, the airflow path of the cold air inside the hollow heat dissipation ring is increased and the residence time is extended, so that it can fully exchange heat with the heated bearing. The air is then discharged into the double-layer shell through the air guide hole, which effectively avoids the bearing from operating at high temperature for a long time, thereby effectively improving the stability of the motor during operation.

[0008] As a further improvement of this application, the shaft hole, air guide hole, air dissipation hole and air outlet groove are interconnected, the shaft hole is located inside the inner tube, and the air guide hole is located between the baffle and the circular inner wall of the hollow heat dissipation ring.

[0009] As a further improvement to this application, the longitudinal section of the outer tube is an isosceles trapezoid, and the outer ring surface of the baffle fits against the arc-shaped inner wall of the hollow heat dissipation ring.

[0010] As a further improvement of this application, multiple shaft holes, air guide holes, air dissipation holes, air outlet grooves and turbulence bands are all arranged in a ring array around the central shaft, and the air outlet grooves located on the inner tube and the air outlet grooves located on the outer tube are interleaved.

[0011] As another improvement of this application, the turbulence zone is located between the baffle and the outer tube, and the turbulence zone is S-shaped.

[0012] As another improvement of this application, the inner cavity of the central shaft is fixedly connected to two positioning rods, and a spiral plate is fixedly connected between the two positioning rods.

[0013] In summary, in practical applications, cold air enters the central shaft, exits through the shaft hole into the inner tube, and then enters the outer tube through the air outlet grooves on the surface of the inner tube. The spiral blades cause the airflow to rotate along the spiral path, forming a vortex, which prolongs the residence time of the airflow in the hollow heat dissipation ring, thereby improving the heat exchange efficiency. The airflow after heat exchange is discharged through the air outlet grooves on the outer tube. The staggered air outlet grooves can form a multi-layer diffusion airflow, which effectively avoids cooling dead zones and allows heat to be evenly discharged. Then, it comes into contact with the S-shaped turbulence zone, which disturbs the airflow and breaks the laminar boundary layer. The gas is then discharged from the air guide hole, enters the air dissipation hole on the double-layer shell, and finally exits from the double-layer shell. This effectively prevents the bearing from operating at high temperatures for a long time, thereby effectively improving the stability of the motor during operation. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the motor body according to the first embodiment of this application;

[0015] Figure 2 This is an exploded schematic diagram of the motor body according to the first embodiment of this application;

[0016] Figure 3 This is a three-dimensional structural diagram of the central shaft according to the first embodiment of this application;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of the central shaft according to the first embodiment of this application;

[0018] Figure 5 This is a schematic diagram of the hollow heat dissipation ring structure according to the first embodiment of this application;

[0019] Figure 6 This is a schematic cross-sectional view of the hollow heat dissipation ring structure according to the first embodiment of this application;

[0020] Figure 7 This is an exploded view of the turbulence component structure according to the first embodiment of this application;

[0021] Figure 8 This is a cross-sectional view of the central shaft structure according to the second embodiment of this application.

[0022] Explanation of the labels in the diagram:

[0023] 1. Central shaft, 2. Double-layer outer shell, 201. Inner shell, 202. Outer shell, 203. Vent hole, 3. Hot end cap, 4. Cold end cap, 5. Shaft hole, 6. Hollow heat dissipation ring, 7. Vent hole, 8. Inner tube, 9. Outer tube, 10. Vent groove, 11. Spiral blade, 12. Baffle, 13. Baffle strip, 14. Positioning rod, 15. Spiral plate. Detailed Implementation

[0024] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0025] First implementation method:

[0026] Figure 1 , Figure 2 , Figure 3 and Figure 4 The diagram illustrates an air-cooling structure for a high-speed motor, comprising a central shaft 1 penetrating the motor body and a double-layered outer shell 2 sleeved around the central shaft 1. The double-layered outer shell 2 includes an inner cover 201 and an outer cover 202 fixedly sleeved around the inner cover 201. A gap is left between the inner cover 201 and the outer cover 202, and the inner wall of the inner cover 201 has ventilation holes 203. After the gas in the hollow heat dissipation ring 6 is discharged, it enters the space between the inner cover 201 and the outer cover 202 through the ventilation holes 203, and then is discharged through the outer cover 202. The two ends of the double-layered outer shell 2 are respectively fixedly connected to a hot end cap 3 and a cold end cap 4 by bolts, and both are open to airflow. The bearing is mounted on the outer surface of the central shaft 1. The hot end cover 3 integrates a hollow heat dissipation ring 6 and a turbulence component to centrally treat the high-temperature area at the bearing and winding ends. The cold end cover 4 serves as a cold air inlet to prevent the intake of heated airflow and the formation of a thermal cycle. The central shaft 1 has a hollow structure, and a shaft hole 5 is drilled at the outer end of the central shaft 1 near the hot end cover 3. The inner ring of the hot end cover 3 is provided with a hollow heat dissipation ring 6, which is fitted around the bearing. Multiple air guide holes 7 are drilled on the outer wall of the hollow heat dissipation ring 6 to guide the cooling airflow from the shaft into the inner cavity of the hollow heat dissipation ring 6, directly flushing the bearing area and dissipating heat from the bearing area. A turbulence component is also provided inside the hollow heat dissipation ring 6.

[0027] Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7The diagram shows that the turbulence assembly includes an inner tube 8 fixedly connected to the circular inner wall of the hollow heat dissipation ring 6. The inner tube 8 is movably sleeved outside the central shaft 1. An outer tube 9 is fixedly sleeved on the outer surface of the inner tube 8. The longitudinal section of the outer tube 9 is an isosceles trapezoid. Multiple air outlet grooves 10 are carved on the outer surfaces of both the inner tube 8 and the outer tube 9. A spiral blade 11 is fixedly sleeved on the outer surface of the inner tube 8, which can force the airflow to rotate along the spiral path, forming a vortex, effectively prolonging the residence time of the airflow in the hollow heat dissipation ring 6 and improving the heat exchange efficiency. A baffle 12 is fixedly connected to the end of the inner tube 8 away from the circular inner wall of the hollow heat dissipation ring 6. The outer ring surface of the baffle 12 fits against the arc-shaped inner wall of the hollow heat dissipation ring 6. Multiple turbulence bands 13 are fixedly connected to the end of the baffle 12 near the outer tube 9, which can turbulent the airflow. The flow disrupts the laminar boundary layer, allowing the high-temperature wall surface to directly contact the low-temperature airflow, effectively improving heat dissipation. The shaft hole 5, air guide hole 7, air diffuser hole 203, and air outlet groove 10 are interconnected. The shaft hole 5 is located inside the inner tube 8, and the air guide hole 7 is located between the baffle 12 and the circular inner wall of the hollow heat dissipation ring 6. Multiple shaft holes 5, air guide holes 7, air diffuser holes 203, air outlet grooves 10, and turbulence bands 13 are all arranged in a ring array around the central shaft 1. The air outlet grooves 10 on the inner tube 8 and the air outlet grooves 10 on the outer tube 9 are staggered to form a multi-stage diffusion airflow, effectively avoiding cooling dead zones and ensuring uniform heat dissipation. The turbulence band 13 is located between the baffle 12 and the outer tube 9, and the turbulence band 13 is S-shaped, thereby creating turbulence and causing the airflow to be discharged in a staggered manner.

[0028] During motor operation, cool air enters the central shaft 1, exits through the shaft hole 5 into the inner tube 8, and then enters the outer tube 9 through the air outlet groove 10 on the surface of the inner tube 8. The spiral blades 11 cause the airflow to rotate along the spiral path, forming a vortex, thereby prolonging the residence time of the airflow in the hollow heat dissipation ring 6, thus improving the heat exchange efficiency. The airflow after heat exchange is discharged through the air outlet groove 10 on the outer tube 9. The staggered air outlet grooves 10 can form a multi-layer diffusion airflow, thereby effectively avoiding cooling dead zones and allowing heat to be evenly discharged. Then, it comes into contact with the S-shaped turbulence zone 13, thereby disturbing the airflow, destroying the laminar boundary layer, and creating turbulence, causing the airflow to be discharged in a staggered manner. The gas is then discharged from the air guide hole 7, enters the air dissipation hole 203 on the double-layer outer shell 2, and finally exits from the double-layer outer shell 2. This increases the residence time of the airflow inside the hollow heat dissipation ring, achieving efficient heat exchange, effectively changing the extremely uneven heat distribution at both ends of the motor, effectively preventing the bearings from operating at high temperatures for a long time, and thus effectively improving the stability of the motor during operation.

[0029] Second implementation method:

[0030] This embodiment adds a positioning rod 14 and a spiral plate 15 to the first embodiment, while the rest remains the same as the first embodiment.

[0031] Figure 8As shown: Two positioning rods 14 are fixedly connected to the inner cavity of the central shaft rod 1, which can support the spiral plate 15. The spiral plate 15 is fixedly connected between the two positioning rods 14.

[0032] After the cold air enters the interior of the central shaft 1, it is pressurized and accelerated by the spiral plate 15, which effectively increases the airflow speed and pressure into the hollow heat dissipation ring 6.

[0033] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.

Claims

1. An air cooling structure of a high-speed motor, comprising a central shaft (1) penetrating in a motor body and a double-layered shell (2) sleeved outside the central shaft (1), characterized in that: The double-layer shell (2) comprises an inner cover (201) and an outer cover (202) fixedly sleeved outside the inner cover (201), a gap is left between the inner cover (201) and the outer cover (202), and the inner wall of the inner cover (201) is drilled with air dispersing holes (203), the two ends of the double-layer shell (2) are fixedly connected with a hot end cover (3) and a cold end cover (4) through bolts respectively, and both are mounted on the outer surface of the central shaft (1) through bearings, the central shaft (1) is a hollow structure, the outer end of the central shaft (1) close to the hot end cover (3) is drilled with a shaft hole (5), the inner ring of the hot end cover (3) is internally provided with a hollow heat dissipation ring (6), the hollow heat dissipation ring (6) is sleeved outside the bearing, the outer wall of the hollow heat dissipation ring (6) is drilled with a plurality of air guide holes (7), and the hollow heat dissipation ring (6) is internally provided with a turbulence component; The turbulence component comprises an inner tube (8) fixedly connected to the circular inner wall of the hollow heat dissipation ring (6), the inner tube (8) is movably sleeved outside the central shaft (1), the outer surface of the inner tube (8) is fixedly sleeved with an outer tube (9), the outer surfaces of the inner tube (8) and the outer tube (9) are drilled with a plurality of air outlet grooves (10), the outer surface of the inner tube (8) is fixedly sleeved with a spiral fin (11), one end of the inner tube (8) away from the circular inner wall of the hollow heat dissipation ring (6) is fixedly connected with a baffle (12), and one end of the baffle (12) close to the outer tube (9) is fixedly connected with a plurality of turbulence belts (13).

2. The air cooling structure of a high-speed motor according to claim 1, characterized by: The shaft hole (5), the air guide hole (7), the air dispersing hole (203) and the air outlet groove (10) are in communication with each other, the shaft hole (5) is located in the inner tube (8), and the air guide hole (7) is located between the baffle (12) and the circular inner wall of the hollow heat dissipation ring (6).

3. The air cooling structure of a high-speed motor according to claim 1, characterized in that: The longitudinal section of the outer tube (9) is isosceles trapezoidal, and the outer annular surface of the baffle (12) is attached to the arc-shaped inner wall of the hollow heat dissipation ring (6).

4. The air cooling structure of a high-speed motor according to claim 1, characterized by: A plurality of shaft holes (5), air guide holes (7), air dispersing holes (203), air outlet grooves (10) and turbulence belts (13) are arranged in a ring array around the central shaft (1), the air outlet grooves (10) located on the inner tube (8) and the air outlet grooves (10) located on the outer tube (9) are arranged in a staggered manner.

5. The air cooling structure of a high-speed motor according to claim 1, characterized in that: The turbulence belt (13) is located between the baffle (12) and the outer tube (9), and the turbulence belt (13) is S-shaped.

6. The air cooling structure of a high-speed motor according to claim 1, characterized by: Two positioning rods (14) are fixedly connected in the inner cavity of the central shaft (1), and a spiral plate (15) is fixedly connected between the two positioning rods (14).

Images