High-temperature heat dissipation structure of motor

Abstract

According to the motor high-temperature heat dissipation structure provided by the invention, lubricating oil is conveyed and jetted into the bearing cavity through the first bearing jet hole to cool the bearing, and the lubricating oil is jetted to cool the bearing; a second bearing spraying hole sprays lubricating oil to the coaxial shaft, and oil spraying cooling is conducted on the coaxial shaft; the rotating shaft cavity oil inlet and the stator cavity oil inlet flow into the motor cavity to respectively spray oil to cool the iron cores of the motor winding and the stator; each air channel is formed between every two adjacent lubricating oil outflow channels, and heat in the motor shell is rapidly dissipated to the external environment through the air channels and the heat dissipation fins on the motor shell or through the design of the air channels and the heat dissipation fins on the motor shell according to the air convection principle. A comprehensive and efficient heat dissipation system is constructed, the lubricating efficiency is improved, consumption and waste of lubricating oil are reduced, and the heat dissipation problem of the aviation high-speed motor in the high-rotating-speed and high-temperature environment is effectively solved.

Description

Technical Field

[0001] The invention relates to a high-temperature heat dissipation structure of a motor. Background Art

[0002] High-speed motors usually refer to motors with speeds exceeding 10,000 r / min. In aviation turbine high-speed motors, high-speed motors are the core power source, and their performance stability and efficiency are directly related to the operating quality of the overall equipment. However, under high-intensity and high-load conditions, the motor shaft often faces the challenge of a sharp rise in temperature due to the huge mechanical stress and internal friction heat.

[0003] In some scenarios, the motor shaft needs to rotate together with other equipment (such as a gas turbine), and one end needs to be thickened and extended as a coaxial shaft. Since this section is connected to other equipment, it is often exposed to high temperature environments. If it is not cooled, it will be transmitted to the motor end, causing the shaft temperature at the motor end to rise to over 700°C, which not only seriously affects the service life and operating efficiency of the motor, but may also cause safety hazards.

[0004] Therefore, in order to solve the high temperature problem of the high-speed motor shaft that needs to share the same rotating shaft with other equipment and the coaxial part is located in a high-temperature environment, traditional heat dissipation methods can no longer meet the requirements of high efficiency and reliability.

[0005] Therefore, an innovative integrated heat dissipation design that directly targets the high temperature pain point of the high-speed motor shaft to achieve efficient and uniform heat dissipation has become a key issue that urgently needs to be broken through in the current field of motor technology. Summary of the invention

[0006] The object of the present invention is to provide a high-temperature heat dissipation structure for a motor.

[0007] In order to solve the above problems, the present invention provides a motor high-temperature heat dissipation structure, comprising: a bearing chamber 4, a motor shaft and a motor housing 1, wherein:

[0008] A lubricating oil cooling bearing 14 is arranged in the bearing chamber 4, and a first spray hole 2 and a second spray hole 3 which are respectively connected to the lubricating oil heat exchange box are arranged on the bearing chamber 4, and the first spray hole 2 sprays lubricating oil to cool the bearing;

[0009] The motor shaft comprises: a coaxial shaft 12 and an inner shaft 13, wherein one end of the coaxial shaft 12 of the motor shaft is passed through an oil cooling bearing 14 in a bearing chamber 4, and one end of the coaxial shaft 12 passes through the bearing chamber for connection with the shaft of other external equipment, and the second injection hole 3 injects oil to cool the coaxial shaft 12 in the bearing chamber;

[0010] The motor housing 1 is provided with: a motor chamber; the inner shaft, the motor winding 9, and the stator core are arranged in sequence from the inside to the outside in the motor chamber; the other end of the coaxial shaft is connected to one end of the inner shaft 13 through the inlet end of the bearing chamber 4 and the outlet end of the motor chamber, and the other end of the inner shaft is passed through the lubricating bearing 8.

[0011] Furthermore, in the above-mentioned high-temperature heat dissipation structure of the motor, a plurality of lubricating oil outflow channels 5 connected to the circumference of the motor chamber are arranged between the motor housing 1 and the motor chamber, an annular oil collecting channel 6 connected to each lubricating oil outflow channel 5 is arranged on the outer ring of the motor housing away from the motor chamber, and a lubricating oil outlet 7 connected to the annular oil collecting channel 6 is arranged on the motor housing; wherein the lubricating oil outlet 7 extends out of the motor housing.

[0012] Furthermore, in the above-mentioned high-temperature heat dissipation structure of the motor, a shaft cavity extending axially is arranged at the center of the inner shaft 13, and a shaft cavity oil inlet 10 connected to an external lubricating oil heat exchange box is arranged at one end of the shaft cavity away from the bearing cavity, and a shaft cavity oil outlet 26 connected to the shaft cavity is axially arranged with multiple circles between the two ends of the inner shaft.

[0013] Furthermore, in the above-mentioned high-temperature heat dissipation structure of the motor, the center of the stator core is axially penetrated, and the end of the lubricating oil cooling outflow channel 28 away from the bearing chamber is provided with a stator cavity oil inlet 11 connected to the external lubricating oil heat exchange box, and the end of the lubricating oil cooling outflow channel 28 close to the bearing chamber is provided with a stator cavity oil outlet, that is, the port of the lubricating oil cooling outflow channel 28.

[0014] Furthermore, in the above-mentioned high-temperature heat dissipation structure of the motor, the inlet end of the bearing chamber 4 is connected to the outlet end of the motor chamber, so that the lubricating oil sprayed and cooled in the bearing chamber 4 can enter the motor chamber, flow out through the lubricating oil outflow channel 5, and then gather to the lubricating oil outlet 7 after passing through the annular oil collecting channel 6.

[0015] Furthermore, in the above-mentioned motor high-temperature heat dissipation structure, each of the air ducts 15 located between the motor housing and the motor chamber is formed between two adjacent lubricating oil outflow channels 6;

[0016] The end shells at both ends of the motor housing are respectively provided with an air inlet 18 and an air outlet 16 connected to the air duct;

[0017] Furthermore, an exhaust fan 17 connected to each of the air outlets 16 is provided on the inner side of the end shell provided with the air outlets.

[0018] Furthermore, in the above motor high temperature heat dissipation structure, the diameter of the coaxial shaft 12 is larger than the diameter of the inner shaft 13; and / or

[0019] Controllers for various devices are also provided in the air duct 15;

[0020] Preferably, an adjustment spring 23 is also sleeved on the coaxial shaft 12 .

[0021] Furthermore, in the above-mentioned motor high-temperature heat dissipation structure, the inlet end of the bearing chamber 4 is connected to the outlet end of the motor chamber through a seal 19.

[0022] Furthermore, in the above-mentioned motor high-temperature heat dissipation structure, the bearing chamber is provided with:

[0023] From the outlet end to the inlet end of the bearing chamber 4, a locking nut 20, a first wall tooth 21, a first oil-slinging plate 22 and a lubricating oil cooling bearing 14 are sequentially arranged, wherein:

[0024] The first oil-slinging plate 22 seals the bearing chamber 4 by cooperating with the first wall teeth 21; the locking nut 20 limits and fixes the first wall teeth 21; preferably, when the coaxial 12 is connected to the shaft of other external equipment, the locking nut 20 can be replaced by a connecting piece to connect the coaxial 12 to the shaft of other external equipment through the connecting piece.

[0025] One end of the coaxial shaft 12 passes through the bearing and is sequentially sleeved in the lubricating oil cooling bearing 14, the first oil-slinging plate 22, the first wall tooth 21 and the locking nut 20;

[0026] And / or, the lubricating bearing 8 is arranged outside the motor chamber, and the motor chamber is provided with a second wall tooth 24 and a second oil-slinging plate 25 in sequence, the second wall tooth 24 is adjacent to the lubricating bearing, and the second oil-slinging plate 25 seals the motor chamber through the cooperation of the second wall tooth 24;

[0027] Preferably, the lubricating bearing 8 is lubricated by grease.

[0028] Furthermore, in the above-mentioned motor high temperature heat dissipation structure, the aperture of each shaft cavity oil outlet 26 is between 0.5-1 mm, and the shaft wall thickness of the inner shaft 13 is 3-5 mm in diameter; and / or

[0029] The motor housing 1 is also provided with heat dissipation fins 29 .

[0030] Compared with the prior art, the present invention delivers and sprays the lubricating oil to the bearing cooling bearing in the bearing chamber through the first bearing spray hole to spray the lubricating oil to cool the lubricating oil cooling bearing; the second bearing spray hole sprays the lubricating oil to the coaxial shaft to spray the coaxial shaft to cool the coaxial shaft; the oil inlet of the shaft cavity and the oil inlet of the stator cavity flow into the motor cavity, and the motor winding and the stator core are sprayed with oil to cool down respectively; each air duct is formed between two adjacent lubricating oil outflow channels to perform air-cooled convection heat dissipation on the components in the motor housing, and the heat in the motor housing is quickly dissipated to the external environment through the air duct and the heat dissipation fins or design on the motor housing and the principle of air convection.

[0031] The present invention constructs a comprehensive and efficient heat dissipation system, which not only solves the heat dissipation problem of high-speed motors in high-temperature environments, but also improves the overall performance and reliability of the motors, laying a solid foundation for the performance improvement of 150KG-class aviation high-speed motors. The present invention also designs an efficient oil return system to collect and return the used lubricating oil to the lubricating oil heat exchange box for recycling. This system not only improves the lubrication efficiency, but also reduces the consumption and waste of lubricating oil, effectively solving the heat dissipation problem of aviation high-speed motors in high-speed and high-temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is an axial cross-sectional view of a high-temperature heat dissipation structure of a motor according to an embodiment of the present invention;

[0033] Figure 2 is a schematic diagram of a motor housing and its internal structure according to an embodiment of the present invention;

[0034] Figure 3 is a schematic diagram of a motor shaft according to an embodiment of the present invention;

[0035] Figure 4 Schematic diagram of a high-temperature heat dissipation structure of a motor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] like Figures 1 to 4 As shown, the present invention provides a motor high temperature heat dissipation structure, comprising: a bearing chamber 4, a motor housing 1 and a motor shaft, wherein:

[0038] A lubricating oil cooling bearing 14 is arranged in the bearing chamber 4, and a first spray hole 2 and a second spray hole 3 which are respectively connected to the lubricating oil heat exchange box are arranged on the bearing chamber 4, and the first spray hole 2 sprays lubricating oil to cool the bearing;

[0039] The motor shaft comprises: a coaxial shaft 12 and an inner shaft 13, wherein one end of the coaxial shaft 12 of the motor shaft is passed through an oil cooling bearing 14 in a bearing chamber 4, and one end of the coaxial shaft 12 passes through the bearing chamber for connection with the shaft of other external equipment, and the second injection hole 3 injects oil to cool the coaxial shaft 12 in the bearing chamber;

[0040] The motor housing 1 is provided with: a motor chamber; the inner shaft, the motor winding 9, and the stator core are arranged in sequence from the inside to the outside in the motor chamber; the other end of the coaxial shaft is connected to one end of the inner shaft 13 through the inlet end of the bearing chamber 4 and the outlet end of the motor chamber, and the other end of the inner shaft is passed through the lubricating bearing 8.

[0041] Specifically, the inlet end of the bearing chamber 4 is connected to the outlet end of the motor housing 1; the shell of the bearing chamber 4 is provided with a first bearing injection hole 2 and a second bearing injection hole 3 connected to the external lubricating oil heat exchange box for inputting lubricating oil; an oil-lubricating oil cooling bearing 14 is arranged in the bearing chamber 4.

[0042] A plurality of lubricating oil outflow channels 5 connected to the circumference of the motor chamber are arranged between the motor housing and the motor chamber, an annular oil collecting channel 6 connected to each lubricating oil outflow channel 5 is arranged on the outer ring of the motor housing away from the motor chamber, and a lubricating oil outlet 7 connected to the annular oil collecting channel 6 is arranged on the motor housing; wherein the lubricating oil outlet 7 extends out of the motor housing.

[0043] Here, the motor housing 1 is provided with: a motor chamber, various lubricating oil outflow channels 5 connected to the circumference of the motor chamber, an annular oil collecting channel 6 connected to each lubricating oil outflow channel 5, a lubricating oil outlet 7 connected to the bottom of the annular oil collecting channel 6, and a grease lubricated bearing 8 arranged outside the motor chamber; wherein the lubricating oil outlet 7 extends out of the motor housing; the motor chamber is provided with a motor winding 9, a stator core, a shaft chamber oil inlet 10 and a stator chamber oil inlet 11 connected to an external lubricating oil heat exchange box, and the shaft chamber oil inlet 10 and the stator chamber oil inlet 11 are used to input lubricating oil;

[0044] like Figure 1 and 3 As shown, the motor shaft comprises two sections: a coaxial shaft 12 and an inner shaft 13. Figure 3In the figure, the part framed by the dotted line on the left is the coaxial shaft 12, and the rest of the part on the right is the inner shaft 13, wherein the coaxial shaft 12 of the motor shaft is passed through the lubricating oil cooling bearing 14 in the bearing chamber 4; the inner shaft 13 of the motor shaft is arranged in the motor chamber, and one end of the coaxial shaft 12 is connected to the shaft of other external equipment as a whole, such as being connected to the shaft of the power turbine of the gas turbine engine as a whole; the other end of the coaxial shaft is connected to one end of the inner shaft 13 through the outlet end of the motor chamber and the inlet end of the bearing chamber 4; the shaft chamber oil inlet 10 is arranged on the inner shaft 13 of the motor shaft;

[0045] Here, if Figure 1 As shown, the portion of the bearing chamber 4 far from the motor chamber is referred to as the outlet end of the bearing chamber 4; the portion of the bearing chamber 4 close to the motor chamber is referred to as the inlet end of the bearing chamber 4;

[0046] like Figure 1 As shown, one end of the motor chamber away from the bearing chamber 2 is called the inlet end of the motor chamber, and one end of the motor chamber close to the bearing chamber 2 is called the outlet end of the motor chamber.

[0047] On the one hand, the lubricating oil flows into the bearing chamber 4 from the first bearing injection hole 2 and the second bearing injection hole 3 respectively, and after the lubricating oil cooling bearing 14 and the coaxial shaft 12 are cooled by oil spraying, the lubricating oil flows into the lubricating oil outflow channel 5 from the inlet end of the bearing chamber 4 and the outlet end of the motor chamber in sequence, and the lubricating oil passes through the lubricating oil outflow channel 5, the annular oil collecting channel 6 and the lubricating oil outlet 7 in sequence, and then returns to the lubricating oil heat exchange box;

[0048] On the other hand, the lubricating oil flows into the motor chamber from the oil inlet 10 of the shaft cavity and the oil inlet 11 of the stator cavity respectively. After the motor winding 9 and the iron core of the stator are cooled by spraying oil respectively, the lubricating oil passes through the lubricating oil outflow channel 5, the annular oil collecting channel 6 and the lubricating oil outlet 7 in turn, and then returns to the lubricating oil heat exchange box.

[0049] Here, some motor shafts, in special scenarios, need to be coaxial with other equipment, such as being coaxial with the power turbine of a gas turbine engine. In this case, the coaxial diameter of one end of the shaft connected to the other equipment can be enlarged to enhance strength. When this section of the coaxial shaft with increased strength is shared with other equipment, it is sometimes used in high-temperature scenarios. If the temperature is not reduced, heat conduction will be transferred to the entire shaft, affecting the use of the shaft, and the heat will also be transferred to other parts of the motor through the shaft, affecting the use of the entire motor. For this reason, the present invention has carried out a cooling design for this type of motor, wherein the coaxial shaft is disposed in the bearing chamber and the inner shaft is disposed in the motor chamber.

[0050] Optionally, the diameter of the coaxial shaft 12 is larger than the diameter of the inner shaft 13. The diameter of the coaxial shaft may be, for example, in the range of 35-50 mm.

[0051] Specifically, the lubricating oil returned to the lubricating oil heat exchange box can be cooled to facilitate the recycling of the lubricating oil in the lubricating oil heat exchange box, which not only improves the lubrication efficiency but also reduces the consumption and waste of lubricating oil.

[0052] The first bearing injection hole 2 and the second bearing injection hole 3 can spray the lubricating oil directly onto the lubricating oil cooling bearing and the coaxial surface. The centrifugal force of the coaxial operation is used to throw the lubricating oil out of the coaxial surface, and the coaxial surface 12 and the lubricating oil cooling bearing are sprayed for lubrication, forming a continuous and uniform oil film, which effectively reduces friction and wear.

[0053] Preferably, Figure 1 and 2 As shown, air ducts 15 located between the motor housing and the motor chamber are formed between two adjacent lubricating oil outflow channels 6; an air inlet 18 and an air outlet 16 connected to the air duct are respectively provided on the end shells at both ends of the motor housing; further, an exhaust fan 17 connected to each of the air outlets 16 is provided on the inner side of the end shell provided with the air outlet.

[0054] Specifically, the motor chamber is provided with a plurality of lubricating oil outflow channels 5 at intervals in the circumferential direction, and the inlet end of each lubricating oil outflow channel 5 is connected to the circumferential side wall of the motor chamber; the interval channels between two adjacent lubricating oil outflow channels 6 form respective air ducts 15, and more preferably, Figure 2 As shown, the lubricating oil outflow channel 5 and the air duct 15 are alternately spaced along the circumference of the motor chamber; preferably, an air outlet 16 is provided on the motor housing 1 at one end of each air duct 15, and an exhaust fan 17 is provided in the motor housing near the air outlet 16, and optionally, the air outlet 16 and the exhaust fan 17 are arranged near the inlet end of the motor chamber; an air inlet 18 is provided on the motor housing at the other end of each air duct, and optionally, the air inlet 18 is arranged near the outlet end of the motor chamber; the air duct is exhausted and cooled by the exhaust fan.

[0055] Optionally, controllers of various devices may be provided in the air duct 15; specifically, the control panels of various devices may include any combination of: an induction motor drive controller, a fuel oil cooling medium pump motor drive controller, an electric energy output motor drive controller, an engine controller, an AC-DC inverter controller, and a power management controller.

[0056] Induction motor drive controller: This controller is mainly responsible for starting, running and monitoring the status of the induction motor of the gas turbine engine. It controls the drive system of the induction motor and adjusts the output voltage, frequency and other parameters of the generator to ensure that the generator can generate electricity stably and efficiently;

[0057] Gas motor bearing cooling medium pump motor drive controller: This controller is specifically used to drive the pump motor that delivers the cooling medium (usually lubricating oil) from the lubricating oil heat exchange box to the bearing. Its main function is to ensure that the bearing is properly cooled and lubricated to prevent overheating and wear. This controller is also responsible for monitoring the operating status of the pump motor to ensure the effective operation of the cooling system;

[0058] Electric energy output motor drive controller: in this example, it is the controller of the motor in the integrated system 1 of the control system and the motor. This controller is used to drive and control the operation of the motor. It may involve the operation of starting, accelerating, decelerating, stopping, etc. of the motor, and may include precise control of parameters such as motor speed, torque, position, etc. The corresponding motor is a motor driven by the gas turbine engine to output electric energy. Preferably, the motor is a high-speed motor;

[0059] The engine control unit (ECU) reads data from various sensors (such as MAP sensor, throttle position sensor, air temperature sensor, etc.) and adjusts the engine's operating parameters (such as fuel injection amount, ignition timing, etc.) in real time to optimize the engine's performance, fuel economy, and emission levels;

[0060] AC-DC inverter controller: This controller is responsible for converting alternating current (AC) into direct current (DC). It is widely used in situations where AC needs to be converted into DC suitable for use by electronic equipment. The controller also includes functions such as voltage regulation and overload protection to ensure the safety and stability of the conversion process;

[0061] Power management controller: The power management controller is responsible for managing and allocating power resources throughout the system. It may include functions such as monitoring power status (such as voltage, current, power, etc.), controlling the switching and switching of power supplies, and optimizing power distribution to improve energy efficiency. In addition, the power management controller also has fault detection and alarm functions to ensure the stability and reliability of the system power supply. In the system, the power management controller also communicates with other systems (such as engine controllers, battery management systems, etc.) to achieve more sophisticated power management and optimization.

[0062] Preferably, Figure 2 As shown, the outlet end of each lubricating oil outflow channel 5 is communicated with the annular oil collecting channel 6, and the bottom of the annular oil collecting channel 6 is connected with a lubricating oil outlet 7; the lubricating oil outlet 7 is communicated with the lubricating oil heat exchange box.

[0063] Preferably, the inlet end of the bearing chamber 4 is connected to the outlet end of the motor chamber, so that the lubricating oil sprayed and cooled in the bearing chamber 4 can enter the motor chamber, flow out through the lubricating oil outflow channel 5, and then gather at the lubricating oil outlet 7 after passing through the annular oil collecting channel 6.

[0064] Preferably, Figure 1 and 4 As shown, the connection between the inlet end of the bearing chamber 4 and the outlet end of the motor chamber is sealed by a seal 19 .

[0065] Preferably, the bearing chamber is provided with:

[0066] like Figure 1 As shown, from the outlet end to the inlet end of the bearing chamber 4, a locking nut 20, a first wall tooth 21, a first oil-slinging plate 22 and a lubricating oil cooling bearing 14 are sequentially arranged, wherein:

[0067] The first oil-slinging plate 22 seals the bearing chamber 4 by cooperating with the first wall teeth 21; the locking nut 20 limits and fixes the first wall teeth 21; preferably, when the coaxial 12 is connected to the shaft of other external equipment, the locking nut 20 can be replaced by a connecting piece to connect the coaxial 12 to the shaft of other external equipment through the connecting piece.

[0068] The coaxial shaft 12 is sequentially sleeved in the lubricating oil cooling bearing 14, the first oil-slinging plate 22, the first wall tooth 21 and the locking nut 20;

[0069] The bearing chamber 4 is provided with a first bearing injection hole 2 and a second bearing injection hole 3, which are respectively connected to the lubricating oil heat exchange box. On the one hand, the lubricating oil is sequentially transported from the lubricating oil heat exchange box and the first bearing injection hole 2 and injected to the lubricating oil cooling bearing 14 in the bearing chamber 4 to spray the lubricating oil cooling bearing for cooling; on the other hand, the lubricating oil is sequentially injected from the lubricating oil heat exchange box and the second bearing injection hole 3 to the coaxial shaft 12 to spray the coaxial shaft 12 for cooling; during the lubricating oil injection process, the first oil-spinning plate 22 cooperates to allow the injected oil to be better distributed to the cooling components, and the lubricating oil after heat dissipation flows from the inlet end of the bearing chamber 4 through the outlet end of the motor chamber under the action of gravity, and the lubricating oil returns to the lubricating oil heat exchange box after passing through the lubricating oil outflow channel 5, the annular oil collecting channel 6 and the lubricating oil outlet 7 in turn.

[0070] More preferably, Figure 1 As shown, the coaxial shaft 12 is also provided with an adjustment spring 23 to cushion the impact force caused by the rotation of other equipment. For example, the adjustment spring 23 can be provided on the part of the coaxial shaft 12 where the lubricating oil cooling bearing 14, the first oil throwing plate 22, the first wall tooth 21 and the locking nut 20 are not provided.

[0071] Preferably, the motor chamber is provided with: a second wall tooth 24 and a second oil-slinging plate 25 in sequence from the inlet end to the outlet end, and the second oil-slinging plate 25 seals the motor chamber by cooperating with the second wall tooth 24;

[0072] A grease-lubricated bearing 8 is arranged outside the second wall teeth, and the grease-lubricated bearing 8 is separately arranged in the motor housing outside the motor chamber, and the grease-lubricated bearing is lubricated by grease, which is different from the components in the motor chamber being lubricated by lubricating oil;

[0073] The other end of the inner shaft 13 of the motor shaft, namely the end close to the entrance of the motor chamber, is sequentially passed through the second oil-slinging plate 25, the second wall teeth 24 and the grease-lubricated bearing 8 from inside the motor chamber to outside.

[0074] Preferably, a shaft cavity extending axially is provided at the center of the inner shaft 13, and a shaft cavity oil inlet 10 connected to an external lubricating oil heat exchange box is provided at one end of the shaft cavity away from the bearing cavity, and a shaft cavity oil outlet 26 connected to the shaft cavity is axially provided with multiple circles of intervals between the two ends of the inner shaft.

[0075] Specifically, the inner shaft 13 is an integrated shaft, the inner shaft 13 is provided with motor windings around it, a shaft cavity is provided in the inner shaft, a shaft cavity oil inlet 10 is provided at one end of the shaft cavity, and the shaft cavity oil inlet 10 is connected to the lubricating oil heat exchange box; a plurality of shaft cavity oil outlets 26 are provided in the radial direction of the shaft cavity, which is one circle, and a plurality of such shaft cavity oil outlets 26 are provided in the axial direction of the shaft cavity, and each shaft cavity oil outlet 26 is connected to each corresponding rotor lubricating oil cooling inner flow distributed around it. The lubricating oil flows from the shaft cavity oil inlet 10 through the shaft cavity, each shaft cavity oil outlet 26, each rotor lubricating oil cooling inner flow channel 27 to the motor winding 9 in sequence, and through the cooperation of the second oil-slinging plate 25, during the rotation of the inner shaft 13, the motor winding 9 is cooled and cooled. The lubricating oil on the motor winding 9 passes through the gap and side wall in the motor cavity, and passes through the lubricating oil outflow channel 5, the annular oil collecting channel 6 and the lubricating oil outlet 7 in sequence, and then returns to the lubricating oil heat exchange box.

[0076] Specifically, the diameter of each oil outlet of the rotating shaft cavity may be between 0.5 and 1 mm, and the wall thickness of the inner shaft may be between 3 and 5 mm in diameter.

[0077] Preferably, a lubricating oil cooling outflow channel 28 is axially penetrated through the center of the stator core, and a stator cavity oil inlet 11 connected to an external lubricating oil heat exchange box is provided at one end of the lubricating oil cooling outflow channel 28 away from the bearing chamber, and a stator cavity oil outlet, i.e., a port of the lubricating oil cooling outflow channel 28, is provided at one end of the lubricating oil cooling outflow channel 28 close to the bearing chamber.

[0078] Specifically, a lubricating oil cooling outflow channel 28 is provided on the iron core of the stator arranged in the motor chamber, and a stator cavity oil inlet 11 is provided at one end of the lubricating oil cooling outflow channel 28, and the stator cavity oil inlet 11 is connected to the lubricating oil heat exchange box; the lubricating oil flows through the lubricating oil cooling outflow channel from the stator cavity oil inlet 11 to cool the iron core of the stator, and then the lubricating oil in the lubricating oil cooling outflow channel 28 passes through the gap and side walls in the motor chamber, and passes through the stator cavity oil outlet, the lubricating oil outflow channel 5, the annular oil collecting channel 6 and the lubricating oil outlet 7 in sequence, and then returns to the lubricating oil heat exchange box.

[0079] Better, such as Figure 2 and 4 As shown, heat dissipation fins 29 are also provided on the outer surface of the motor housing 1 .

[0080] The present invention delivers and sprays lubricating oil to the bearing cooling bearing in the bearing chamber through the first bearing spray hole to spray the lubricating oil to cool the bearing; the second bearing spray hole sprays lubricating oil to the coaxial shaft to spray the coaxial shaft to cool the coaxial shaft; the oil inlet of the shaft cavity and the oil inlet of the stator cavity flow into the motor cavity, and spray the motor winding and the stator iron core to cool them respectively; each air duct is formed between two adjacent lubricating oil outflow channels to perform air-cooled convection heat dissipation on the components in the motor housing, and the heat in the motor housing is quickly dissipated to the external environment through the air duct and the heat dissipation fins or designs on the motor housing and the principle of air convection.

[0081] The present invention constructs a comprehensive and efficient heat dissipation system, which not only solves the heat dissipation problem of high-speed motors in high-temperature environments, but also improves the overall performance and reliability of the motors, laying a solid foundation for the performance improvement of 150KG-class aviation high-speed motors. The present invention also designs an efficient oil return system to collect and return the used lubricating oil to the lubricating oil heat exchange box for recycling. This system not only improves the lubrication efficiency, but also reduces the consumption and waste of lubricating oil, effectively solving the heat dissipation problem of aviation high-speed motors in high-speed and high-temperature environments when the rotating shaft is shared as one.

[0082] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0083] Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A high temperature heat dissipation structure of a motor, characterized in that: include: A bearing chamber (4), a motor shaft and a motor housing (1), wherein: A lubricating oil cooling bearing (14) is arranged in the bearing chamber (4), and a first spray hole (2) and a second spray hole (3) are arranged on the bearing chamber (4), respectively connected to the lubricating oil heat exchange box, and the first spray hole (2) sprays lubricating oil to cool the bearing; The motor shaft comprises: a coaxial shaft (12) and an inner shaft (13) in two sections, wherein one end of the coaxial shaft (12) of the motor shaft is passed through an oil cooling bearing (14) in a bearing chamber (4), and one end of the coaxial shaft (12) passes through the bearing chamber to be connected to the shaft of other external equipment, and the second spray hole (3) sprays oil to cool the coaxial shaft (12) in the bearing chamber; The motor housing (1) is provided with: a motor chamber; the inner shaft, the motor winding (9), and the stator iron core are arranged in sequence from the inside to the outside of the motor chamber; the other end of the coaxial shaft is connected to one end of the inner shaft (13) through the inlet end of the bearing chamber (4) and the outlet end of the motor chamber, and the other end of the inner shaft is passed through the lubricating bearing (8).

2. The motor high temperature heat dissipation structure according to claim 1, characterized in that: A shaft cavity extending in the axial direction is arranged at the center of the inner shaft (13); a shaft cavity oil inlet (10) connected to the lubricating oil heat exchange box is arranged at one end of the shaft cavity away from the bearing cavity (4); and shaft cavity oil outlets (26) connected to the shaft cavity are arranged in a plurality of circles between the two ends of the inner shaft in the axial direction.

3. The motor high temperature heat dissipation structure according to claim 1 or 2, characterized in that: An oil cooling outflow channel (28) is axially penetrated through the center of the stator core, and a stator cavity oil inlet (11) connected to the lubricating oil heat exchange box is provided at one end of the oil cooling outflow channel (28) away from the bearing cavity (4), and a stator cavity oil outlet is provided at one end of the oil cooling outflow channel (28) close to the bearing cavity (4).

4. The motor high temperature heat dissipation structure according to any one of claims 1 to 3, characterized in that: A plurality of lubricating oil outflow channels (5) connected to the circumference of the motor chamber are arranged between the motor housing (1) and the motor chamber, an annular oil collecting channel (6) connected to each of the lubricating oil outflow channels (5) is arranged on the outer ring of the motor housing away from the motor chamber, and a lubricating oil outlet (7) connected to the annular oil collecting channel (6) is arranged on the motor housing; wherein the lubricating oil outlet (7) extends out of the motor housing.

5. The motor high temperature heat dissipation structure according to claim 4, characterized in that: The inlet end of the bearing chamber (4) is connected to the outlet end of the motor chamber, so that the lubricating oil sprayed into the bearing chamber (4) after cooling enters the motor chamber, flows out through the lubricating oil outflow channel (5), and is collected to the lubricating oil outlet (7) through the annular oil collecting channel (6).

6. The motor high temperature heat dissipation structure according to claim 4 or 5, characterized in that: Each of the two adjacent lubricating oil outflow channels (6) forms an air duct (15) located between the motor housing and the motor chamber; An air inlet (18) and an air outlet (16) communicating with the air duct are respectively arranged on the end shells at both ends of the motor housing; Furthermore, an exhaust fan (17) connected to each of the air outlets (16) is provided on the inner side of the end shell provided with the air outlets.

7. The motor high temperature heat dissipation structure according to any one of claims 1 to 6, characterized in that: The diameter of the coaxial shaft (12) is larger than the diameter of the inner shaft (13); and / or The air duct (15) is also provided with controllers for various devices; Preferably, an adjustment spring (23) is also sleeved on the coaxial shaft (12).

8. The motor high temperature heat dissipation structure according to any one of claims 1 to 7, characterized in that: The inlet end of the bearing chamber (4) is connected to the outlet end of the motor chamber via a seal (19).

9. The motor high temperature heat dissipation structure according to any one of claims 1 to 8, characterized in that: The bearing chamber is provided with: From the outlet end to the inlet end of the bearing chamber (4), a locking nut (20), a first wall tooth (21), a first oil-slinging plate (22) and a lubricating oil cooling bearing (14) are sequentially arranged, wherein: The first oil-slinging plate (22) seals the bearing chamber (4) by cooperating with the first wall teeth (21); the locking nut (20) limits and fixes the first wall teeth (21); or, when the coaxial shaft (12) is connected to the shaft of other external equipment, the locking nut (20) is replaced by a connecting piece, so as to connect the coaxial shaft (12) to the shaft of other external equipment through the connecting piece; One end of the coaxial shaft (12) passes through the lubricating oil cooling bearing (14) and is sequentially sleeved in the lubricating oil cooling bearing (14), the first oil-slinging plate (22), the first wall tooth (21) and the locking nut (20); And / or, the lubricating bearing (8) is arranged outside the motor chamber, and the motor chamber is provided with a second wall tooth (24) and a second oil-slinging plate (25) in sequence, the second wall tooth (24) is adjacent to the lubricating bearing, and the second oil-slinging plate (25) seals the motor chamber by cooperating with the second wall tooth (24); Preferably, the lubricating bearing (8) is lubricated by grease.

10. The motor high temperature heat dissipation structure according to claim 1, characterized in that: The diameter of each shaft cavity oil outlet (26) is in the range of 0.5-1 mm, and the wall thickness of the inner shaft (13) is in the range of 3-5 mm in diameter; and / or Heat dissipation fins (29) are also provided on the outer surface of the motor housing (1).

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