Miniature turbine generator

Abstract

The embodiment of the invention provides a miniature turbine generator. The miniature turbine generator comprises a gas compressor, a starter / generator and a turbine which are coaxially connected in sequence; the heat regenerator is provided with an air inlet, an air outlet, a fuel gas inlet and a fuel gas outlet; the heat regenerator is communicated with a gas nozzle of the turbine through a gas inlet; one end of the single-barrel type combustion chamber assembly communicates with an air outlet of the heat regenerator, and the other end of the single-barrel type combustion chamber assembly communicates with an air inlet of the turbine. One end of the cold air pipe is connected with a high-pressure exhaust port of the air compressor, and the other end of the cold air pipe is connected with an air inlet of the heat regenerator. One effect of the invention lies in that the starter / generator is arranged between the gas compressor and the turbine, thereby facilitating the installation of the bearing and reducing vibration and noise.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the field of micro gas turbine generator technology, specifically relating to a micro turbine generator. Background Technology

[0002] A micro turbine generator is a small power generation device that works by burning fuels such as natural gas, diesel, gasoline, and propane, or by using waste heat to generate high-temperature, high-pressure gas, which drives a turbine to rotate, thereby converting mechanical energy into electrical energy. The power range of micro turbine generators typically ranges from 25 kW to 500 kW, depending on the design and application, such as distributed generation, combined heat and power (CHP), and backup power.

[0003] As a highly efficient energy conversion device integrating turbomachinery and power generation, the micro turbine generator has significant application value in UAV power systems, portable power generation equipment, and distributed energy fields. With the development of miniaturization technology, existing micro turbine generators have gradually revealed the following bottlenecks in terms of structural design, thermal efficiency, and operational stability: First, their complex structure makes processing and assembly difficult, resulting in low production efficiency; second, their low thermal efficiency necessitates the addition of a regenerator, which further increases the system's complexity, hindering the application and promotion of micro turbine generators.

[0004] Therefore, how to solve the above problems has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The embodiments disclosed herein are intended to at least address one of the technical problems existing in the prior art, and to provide a micro turbine generator.

[0006] One aspect of the embodiments of this disclosure provides a micro turbine generator, comprising: a compressor, a starter / generator, and a turbine connected coaxially in sequence; and a regenerator, a single-barrel combustion chamber assembly, and a cold air pipe having an air inlet, an air outlet, a gas inlet, and a gas outlet. The regenerator is connected to the gas nozzle of the turbine via a gas inlet; One end of the single-barrel combustion chamber assembly is connected to the air outlet of the regenerator, and the other end is connected to the air inlet of the turbine. One end of the cold air pipe is connected to the high-pressure exhaust port of the compressor, and the other end is connected to the air inlet of the regenerator.

[0007] Optionally, the single-barrel combustion chamber assembly includes a hot gas pipe connected at one end to the air outlet of the regenerator, a single-barrel combustion chamber connected at the other end of the hot gas pipe, and a turbine intake pipe connected between the single-barrel combustion chamber and the turbine intake.

[0008] Optionally, the regenerator includes a regenerator housing having an air inlet, an air outlet, a gas inlet, and a gas outlet; an air flow channel disposed within the regenerator housing and having communication with the air inlet and the air outlet; and a diaphragm laminate having communication with the gas flow channel having communication with the gas inlet and the gas outlet.

[0009] Optionally, the diaphragm stack includes multiple alternating layers of first and second diaphragms, the first and second diaphragms together constituting the airflow channel and the gas flow channel that are alternately stacked and isolated from each other.

[0010] Optionally, both the first diaphragm and the second diaphragm are formed to extend in a wavy shape along the x-axis and y-axis directions, and the first diaphragm and the second diaphragm together form the wavy-extending gas flow channel and the air flow channel.

[0011] Optionally, both the first diaphragm and the second diaphragm are configured to extend along a sinusoidal bending curve in both the x-axis and y-axis directions.

[0012] Optionally, the starter / generator includes: Motor housing; The motor stator is fixedly installed inside the motor housing; The motor includes a rotor and a shaft, as well as a first bearing and a second bearing spaced apart at both ends of the motor housing. The motor rotor is coaxially sleeved on the shaft and electromagnetically coupled to the motor stator. The shaft passes through the motor rotor, and its two ends are rotatably connected to the first bearing and the second bearing for support. A first bearing housing and a second bearing housing are disposed at opposite intervals at both ends of the motor housing. The first bearing housing is adapted to be installed with the first bearing, and the second bearing housing is adapted to be installed with the second bearing.

[0013] Optionally, both the first bearing and the second bearing are provided with outer cantilever arms; wherein, the compressor impeller of the compressor is adapted to be connected to the outer cantilever arm of one of the first bearing and the second bearing, and the turbine blades of the turbine are adapted to be connected to the outer cantilever arm of the other of the first bearing and the second bearing.

[0014] Optionally, the starter / generator may include a switched reluctance motor.

[0015] Optionally, the surface of the motor rotor facing the motor stator is provided with a slanted groove structure extending along the axial direction of the motor rotor.

[0016] The beneficial effects of the embodiments of this disclosure include: One advantage of this invention is that it adopts an external single-barrel combustion chamber assembly design. The single-barrel combustion chamber assembly has the characteristics of simple structure and easy processing, as well as high combustion efficiency, easy maintenance, and can be disassembled and replaced separately, making it suitable for space-constrained application scenarios.

[0017] One advantage of this invention is that the regenerator is made by welding a sinusoidally curved diaphragm, which has the characteristics of simple structure and large heat exchange area. Moreover, the regenerator can effectively improve system efficiency and will not affect engine operation.

[0018] In addition, placing the starter / generator between the compressor and turbine facilitates bearing installation and reduces vibration and noise.

[0019] One advantage of this invention is that the starter / generator is installed between the compressor and the turbine, and uses a switched reluctance motor, which is resistant to high temperatures, suitable for high speeds, and also has high reliability.

[0020] One advantage of this invention is that the rotor of the switched reluctance motor adopts a skewed slot structure design, which can reduce motor torque pulsation and act as a fan to accelerate the axial cooling airflow, thereby reducing the system temperature, including the stator and bearing temperatures. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a micro turbine generator according to an embodiment of the present disclosure; Figure 2 This is a cross-sectional view of a micro turbine generator according to an embodiment of the present disclosure; Figure 3 This is a schematic diagram of the cross-section of a compressor according to an embodiment of the present disclosure; Figure 4 This is a schematic diagram of the cross-section of a motor according to an embodiment of the present disclosure; Figure 5 This is a schematic diagram of the cross-section of a turbine according to an embodiment of the present disclosure; Figure 6 This is a top view of a compressor according to an embodiment of the present disclosure; Figure 7 This is a schematic diagram of the structure of a regenerator according to an embodiment of the present disclosure; Figure 8 This is a schematic diagram of the structure of a regenerator according to another embodiment of the present disclosure; Figure 9 This is a schematic diagram of the structure of a membrane laminate according to an embodiment of the present disclosure; Figure 10 This is a schematic diagram of the regenerator duct structure according to an embodiment of the present disclosure; Figure 11 This is a schematic diagram of the structure of a motor according to an embodiment of the present disclosure; Figure 12 This is a schematic diagram of the structure of a switched reluctance motor according to an embodiment of the present disclosure; Figure 13 This is a schematic diagram of the structure of a motor inclined slot according to an embodiment of the present disclosure.

[0022] In the diagram, 1. Compressor; 2. Starter / generator; 3. Turbine; 4. Combustion chamber; 5. Regenerator; 6. Cold air pipe; 7. Hot air pipe; 8. Turbine inlet pipe; 101. Compressor impeller; 201. Motor housing; 202. Motor stator; 203. Motor rotor; 204. Shaft; 205. First bearing; 206. Second bearing; 207. First bearing housing; 208. Second bearing housing; 209. First end cover; 210. Second end cover; 301. Turbine impeller; 501. Regenerator housing; 502. First diaphragm; 503. Second diaphragm; 504. Air flow channel; 505. Gas flow channel; 506. Air inlet; 507. Air outlet; 508. Gas inlet; 509. Gas outlet; 510. First weld; 511. Second weld. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0026] like Figure 1-13 As shown, a micro turbine generator includes: a compressor 1, a starter / generator 2 and a turbine 3 connected coaxially in sequence, as well as a regenerator 5 having an air inlet 506, an air outlet 507, a gas inlet 508 and a gas outlet 509, a single-barrel combustion chamber assembly and a cold air pipe 6.

[0027] The regenerator 5 is connected to the gas nozzle of the turbine 3 via the gas inlet 508. One end of the single-barrel combustion chamber assembly is connected to the air outlet 507 of the regenerator 5, and the other end is connected to the air inlet of the turbine 3. One end of the cold air pipe 6 is connected to the high-pressure exhaust port of the compressor 1, and the other end is connected to the air inlet 506 of the regenerator 5.

[0028] This application employs an external single-barrel combustion chamber assembly design. This single-barrel combustion chamber assembly features a simple structure and ease of fabrication, high combustion efficiency, ease of maintenance, and the ability to be disassembled and replaced independently, making it suitable for space-constrained applications. Furthermore, the regenerator in this application effectively improves system efficiency without affecting engine operation.

[0029] In addition, placing the motor between the compressor and the turbine facilitates bearing installation and reduces vibration and noise.

[0030] In some embodiments, the single-barrel combustion chamber assembly includes a hot gas pipe 7 connected at one end to the air outlet 507 of the regenerator 5, a single-barrel combustion chamber 4 connected at the other end of the hot gas pipe 7, and a turbine 3 intake pipe connected between the single-barrel combustion chamber 4 and the air inlet of the turbine 3.

[0031] In some embodiments, the regenerator 5 includes a regenerator housing 501 having an air inlet 506, an air outlet 507, a gas inlet 508, and a gas outlet 509; an air flow channel 504 disposed within the regenerator housing 501 and having communication with the air inlet 506 and the air outlet 507; and a diaphragm laminate having communication with the gas inlet 508 and the gas outlet 509.

[0032] In some embodiments, the diaphragm stack includes multiple alternating layers of first diaphragm 502 and second diaphragm 503, the first diaphragm 502 and the second diaphragm 503 together forming the alternating and isolated airflow channel 504 and the gas flow channel 505.

[0033] In some embodiments, the first diaphragm 502 and the second diaphragm 503 are both formed to extend in a wavy shape along the x-axis and y-axis directions, and the first diaphragm 502 and the second diaphragm 503 together form the wavy-extending gas flow channel 505 and the air flow channel 504.

[0034] In some embodiments, the first diaphragm 502 and the second diaphragm 503 are both configured to extend along a sinusoidal bending curve in both the x-axis and y-axis directions.

[0035] In some embodiments, the starter / generator 2 includes: a motor housing 201, a motor stator 202, a motor rotor 203, a shaft 204, a first bearing 205 and a second bearing 206 disposed at opposite intervals at both ends of the motor housing 201, and a first bearing seat 207 and a second bearing seat 208 disposed at opposite intervals at both ends of the motor housing 201.

[0036] The motor stator 202 is fixedly installed inside the motor housing 201, and the motor rotor 203 is coaxially sleeved on the rotating shaft 204 and electromagnetically coupled to the motor stator 202. The rotating shaft 204 is configured to pass through the motor rotor 203, and the two ends of the rotating shaft 204 are respectively rotatably connected to the first bearing 205 and the second bearing 206 for support.

[0037] The first bearing housing 207 is adapted to be installed with the first bearing 205, and the second bearing housing 208 is adapted to be installed with the second bearing 206.

[0038] In some embodiments, both the first bearing 205 and the second bearing 206 are provided with outer cantilever arms, wherein the compressor impeller 101 of the compressor 1 is adapted to be connected to the outer cantilever arm of one of the first bearing 205 and the second bearing 206, and the turbine blade 301 of the turbine 3 is adapted to be connected to the outer cantilever arm of the other of the first bearing 205 and the second bearing 206.

[0039] In some embodiments, the starter / generator 2 includes a switched reluctance motor.

[0040] In some embodiments, the surface of the motor rotor 203 facing the motor stator 202 is provided with a slanted groove structure extending along the axial direction of the motor rotor.

[0041] One advantage of this invention is that it adopts an external single-barrel combustion chamber assembly design. The single-barrel combustion chamber assembly has the characteristics of simple structure and easy processing, as well as high combustion efficiency, easy maintenance, and can be disassembled and replaced separately, making it suitable for space-constrained application scenarios.

[0042] One advantage of this invention is that the regenerator is constructed by welding a sinusoidally curved diaphragm, which has the characteristics of simple structure and large heat exchange area.

[0043] One advantage of this invention is that the motor is installed between the compressor and the turbine, and it is a switched reluctance motor, which has the characteristics of high temperature resistance, suitability for high speed, and high reliability.

[0044] One advantage of this invention is that the rotor of the switched reluctance motor adopts a skewed slot structure design, which can reduce motor torque pulsation and act as a fan to accelerate the axial cooling airflow, thereby reducing the system temperature, including the stator and bearing temperatures.

[0045] Specifically, such as Figure 1-2 Figures 8 and 11 show schematic diagrams of a micro turbine generator disclosed in an embodiment of this application. The micro turbine generator includes: a compressor 1, a starter / generator 2, a turbine 3, a single-barrel combustion chamber 4, a regenerator 5, a cold air pipe 6, a hot air pipe 7, and a turbine inlet pipe 8. The starter / generator 2 is installed between the compressor 1 and the turbine 3, and the motor rotor 202 of the starter / generator 2 is coaxially connected to the compressor impeller 101 and the turbine impeller 301, without the need for a coupling, resulting in low vibration and suitability for high-speed operation.

[0046] The high-pressure exhaust port of the compressor 1 is connected to the cold air pipe 6, and one end of the cold air pipe 6 is connected to the air inlet 506 of the regenerator 5. After being heated by the regenerator 5, the high-pressure cold air rises in temperature and enters the air inlet of the single-barrel combustion chamber 4 through the hot air pipe 7 from the air outlet 507 of the regenerator 5. The high-pressure air mixes and burns with fuel in the single-barrel combustion chamber 4 to form high-temperature and high-pressure gas. This gas then passes through the outlet of the single-barrel combustion chamber 4 and is connected to the air inlet of the turbine 3 through the turbine inlet pipe 8, driving the turbine impeller 301 to rotate at high speed. Since the compressor 1 is coaxially connected to the starter / generator 2 and the turbine 3 in sequence, the turbine impeller 301 drives the compressor impeller 101 to compress air and drives the motor rotor 202 to rotate and generate electricity.

[0047] Figure 2This is a cross-sectional view of a micro turbine generator. The dashed lines with arrows indicate the gas flow path. First, external air is drawn into compressor 1 through its inlet. The high-speed rotating compressor impeller 101 compresses the inhaled low-temperature gas. The compressed high-pressure air then flows into the regenerator 5 through the cooling pipe 6. Inside the regenerator 5, it exchanges energy with the high-temperature gas discharged from the turbine 3, raising the temperature of the high-pressure gas to approximately 500°C. This high-pressure air then enters the single-barrel combustion chamber 4 through the hot gas pipe 7. The high-temperature, high-pressure gas, after mixing and combustion in the combustion chamber, flows into the turbine 3 through the turbine inlet pipe 8, driving the turbine impeller 301 to rotate at high speed. Then, the high-temperature gas (above 600°C) enters the regenerator 5 for heat exchange, lowering its temperature before being discharged.

[0048] Figure 3 This is a cross-sectional view of the compressor. Figure 4 This is a cross-sectional view of the starter / generator. Figure 5 This is a cross-sectional view of the turbine. Figure 6 This is a top view of the compressor. Figure 7 The gas outlet of the regenerator is shown in the cross-sectional and top views, which better illustrate the structural composition and assembly relationship of the entire micro turbine generator.

[0049] like Figure 1 and Figure 2 As shown, the micro turbine generator employs a single-barrel external single-barrel combustion chamber 4, installed between the regenerator 5 and the turbine 3. Traditional annular combustion chambers are typically installed between the compressor and the turbine. The single-barrel combustion chamber 4 has a simple structure, is easy to maintain, and can be disassembled and replaced independently, offering a compact design suitable for space-constrained applications. Compared to traditional annular combustion chambers, the single-barrel combustion chamber design of this invention is simpler, eliminating the need for complex flame tube connections, making manufacturing and maintenance easier. Secondly, it offers good structural strength; the cylindrical outer shell of the single-barrel combustion chamber provides excellent mechanical strength, making it suitable for high-temperature and high-pressure environments. Thirdly, it is easy to maintain; the single-barrel combustion chamber can be disassembled and replaced independently without removing the entire annular combustion section, significantly reducing maintenance complexity and cost. Fourthly, it offers reliable ignition; the single-barrel combustion chamber boasts high ignition reliability. Fifthly, the single-barrel combustion chamber exhibits lower aerodynamic losses, contributing to improved combustion efficiency and engine performance.

[0050] Figure 8 This is a schematic diagram of the regenerator 5. Figure 9This is a schematic diagram of the heat exchange membrane stack inside the regenerator. The heat exchange membrane stack inside the regenerator 5 consists of two types: a first membrane 502 and a second membrane 503. These two types of membranes are alternately stacked and welded together to form a single membrane stack, constituting the heat exchange section of the regenerator. The bending curves of the first membrane 502 and the second membrane 503 in both the x-axis and y-axis directions are sinusoidal waves, forming a three-dimensional spatial surface. Because the curves in both the x and y directions are sinusoidal, the air resistance is very small, while the contact area between the hot and cold gases is greatly increased, thereby improving the heat exchange efficiency.

[0051] Figure 10 The diagram shows the air duct structure of the regenerator 5. A first diaphragm 502 and a second diaphragm 503 are alternately stacked. In the x-direction, the first diaphragm 502 and the second diaphragm 503 are welded alternately to form a first weld 510, and an airflow channel 504 is formed between the two welds. After being staggered by one layer in the y-direction, the first diaphragm 502 and the second diaphragm 503 are welded alternately to form a second weld 511, and a gas flow channel 505 is formed between the two welds. High-pressure air from the compressor 1 passes through the airflow channel 504, and high-pressure, high-temperature gas from the turbine 3 passes through the gas flow channel 505, resulting in heat exchange and thus improving the efficiency of the micro-turbine generator.

[0052] Figure 11 This is a schematic diagram of the starter / generator 2 for starting / generating power. The starter / generator 2 can typically be a permanent magnet synchronous motor or a brushless DC motor. This embodiment uses a switched reluctance motor as the starter / generator 2. Since the rotor of a switched reluctance motor has no permanent magnets, it features simple structure, low cost, high temperature resistance, high reliability, suitability for high-speed operation, high efficiency, flexible control, and the ability to quickly switch between motoring and generating states. It is very suitable for use as the starter / generator 2 in a micro-turbine generator. Due to its lack of permanent magnets and high temperature resistance, it can be installed between the compressor 1 and the turbine 3, resulting in a more compact structure and further reduction in size and weight. In contrast, traditional permanent magnet starter generators, due to their poor high-temperature resistance, need to be installed before the air inlet of the compressor 1. This not only complicates the structure and makes installation inconvenient but also affects intake efficiency. Furthermore, due to the long shaft, it can generate vibration, affecting the system's lifespan.

[0053] This embodiment is provided by Figure 11As can be seen, the starter / generator 2 includes: a motor housing 201, a motor stator 202, a motor rotor 203, a rotating shaft 204, a first bearing 205, a second bearing 206, a first bearing housing 207, a second bearing housing 208, a first end cover 209, and a second end cover 210. The motor stator 202 is installed inside the motor housing 201, the motor rotor 203 is installed on the rotating shaft 204, the first bearing 205 and the second bearing 206 are installed at both ends of the rotating shaft 204 and on the first bearing housing 207 and the second bearing housing 208, respectively. The first bearing housing 207 and the second bearing housing 208 are respectively installed at both ends of the motor housing 201, and the first end cover 209 and the second end cover 210 are respectively installed on the first bearing housing 207 and the second bearing housing 208.

[0054] The first bearing 205 and the second bearing 206 can be either air bearings or oil bearings. Using a dynamic pressure air bearing simplifies the structure, eliminates the need for an additional air supply circuit, and only requires reaching the takeoff speed to form a dynamic pressure air film, allowing the rotor to rotate at high speed under extremely low air friction conditions. This improves system lifespan and increases system efficiency.

[0055] In this embodiment, the switched reluctance starter / generator 2 is as follows: Figure 12 The image shows the motor stator 202 and the motor rotor 203. Specifically, it is a 6 / 4 structure switched reluctance motor, meaning the motor stator 202 has 6 teeth, each tooth is divided into three phases by concentrated windings, and the windings on two opposite stator teeth are connected in series to form one phase. The motor rotor 203 has only 4 teeth, no windings or permanent magnets, thus its structure is simple and its reliability is high.

[0056] The motor rotor 203 has an inclined slot structure protruding towards the motor stator 202, see Figure 13 When the motor rotor 203 with its skewed slot structure rotates at high speed, it acts like a fan, blowing cool air onto the motor stator 202 and the second bearing 206. Since the second bearing 206 is close to the turbine 3 and has a higher temperature, the cool airflow generated by the rotating motor rotor 203 blows onto the second bearing 206, thereby reducing its temperature and extending its service life. This also helps to lower the temperature of the motor stator 202.

[0057] In one embodiment, the starter / generator 2 is initially used as an electric motor, and during startup, the speed is increased to the takeoff speed of the air bearing within 1-2 seconds. The above process causes the compressor 1, starter / generator 2, and turbine 3, all mounted on the same shaft in the micro turbine generator, to enter a suspended state. Then, the starter / generator 2 continues to accelerate until it reaches the engine ignition speed. At this point, the fuel supply system injects fuel into the single-barrel combustion chamber 4 and ignition begins. After successful ignition, the high-temperature, high-pressure gas generated in the single-barrel combustion chamber 4 drives the turbine impeller 301 in the turbine 3 to rotate, further increasing the speed. When the engine speed reaches the rated speed... At this time, the starter / generator 2 switches to the power generation state and supplies power to the load.

[0058] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A micro turbine generator, characterized in that, include: The compressor, starter / generator, and turbine are connected coaxially in sequence. As well as a regenerator with an air inlet, an air outlet, a gas inlet, and a gas outlet, a single-barrel combustion chamber assembly, and a cold air pipe; The regenerator is connected to the gas nozzle of the turbine via a gas inlet; One end of the single-barrel combustion chamber assembly is connected to the air outlet of the regenerator, and the other end is connected to the air inlet of the turbine. One end of the cold air pipe is connected to the high-pressure exhaust port of the compressor, and the other end is connected to the air inlet of the regenerator.

2. The micro turbine generator according to claim 1, characterized in that, The single-barrel combustion chamber assembly includes a hot gas pipe connected at one end to the air outlet of the regenerator, a single-barrel combustion chamber connected at the other end of the hot gas pipe, and a turbine intake pipe connected between the single-barrel combustion chamber and the turbine intake.

3. The micro turbine generator according to claim 1, characterized in that, The regenerator includes a regenerator housing with an air inlet, an air outlet, a gas inlet, and a gas outlet; an air flow channel disposed inside the regenerator housing and having communication with the air inlet and the air outlet; and a diaphragm laminate having communication with the gas flow channel and the gas inlet and the gas outlet.

4. The micro turbine generator according to claim 3, characterized in that, The diaphragm stack comprises multiple alternating layers of first and second diaphragms, the first and second diaphragms together constituting the alternating and isolated airflow channel and the gas flow channel.

5. The micro turbine generator according to claim 4, characterized in that, The first diaphragm and the second diaphragm are both formed to extend in a wavy shape along the x-axis and y-axis directions, and the first diaphragm and the second diaphragm together form the wavy-extending gas flow channel and the air flow channel.

6. The micro turbine generator according to claim 5, characterized in that, Both the first diaphragm and the second diaphragm are configured to extend along a sinusoidal bending curve in both the x-axis and y-axis directions.

7. The micro turbine generator according to claim 1, characterized in that, The starter / generator includes: Motor housing; The motor stator is fixedly installed inside the motor housing; The motor includes a rotor and a shaft, as well as a first bearing and a second bearing spaced apart at both ends of the motor housing. The motor rotor is coaxially sleeved on the shaft and electromagnetically coupled to the motor stator. The shaft passes through the motor rotor, and its two ends are rotatably connected to the first bearing and the second bearing for support. A first bearing housing and a second bearing housing are disposed at opposite intervals at both ends of the motor housing. The first bearing housing is adapted to be installed with the first bearing, and the second bearing housing is adapted to be installed with the second bearing.

8. The micro turbine generator according to claim 7, characterized in that, Both the first bearing and the second bearing are provided with outer cantilever arms; wherein, the compressor impeller of the compressor is adapted to be connected to the outer cantilever arm of one of the first bearing and the second bearing, and the turbine blades of the turbine are adapted to be connected to the outer cantilever arm of the other of the first bearing and the second bearing.

9. The micro turbine generator according to claim 1, characterized in that, The starter / generator includes a switched reluctance motor.

10. The micro turbine generator according to claim 1, characterized in that, The surface of the motor rotor facing the motor stator is provided with a slanted groove structure extending along the axial direction of the motor rotor.

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