An active air-floating electromagnetic spring Stirling generator

Abstract

An active air-floating electromagnetic spring Stirling generator comprises a Stirling generator body and an air pump, a first air cavity structure is provided in a gas distribution piston connecting rod, a first air-floating gap is provided between the gas distribution piston connecting rod and a second linear motor, the first air cavity structure sprays air to form an air film at the first air-floating gap, and the action force of the air film is used to make the gas distribution piston connecting rod and the gas distribution piston float at the center position; a second air cavity structure is provided in the power piston, a second air-floating gap is provided between the outer wall of the power piston and the inner wall of the cylinder, a third air-floating gap is provided between the inner wall of the power piston and the gas distribution piston connecting rod, the second air cavity structure sprays air to form an air film at the second air-floating gap and the third air-floating gap, and the action force of the air film is used to make the power piston, the gas distribution piston connecting rod and the gas distribution piston float at the center position; the air pump is connected to the first air cavity structure and the second air cavity structure. The present invention provides radial constraints for the power piston and the gas distribution piston, and can effectively reduce friction.

Description

Technical Field

[0001] The invention relates to a Stirling generator, in particular to an active air-floating electromagnetic spring Stirling generator. Background Art

[0002] With the continuous development of social science and technology, energy issues have increasingly become an important factor restricting the rapid development of countries around the world. The amount of traditional high-quality fossil energy has been decreasing and can no longer meet the needs of human long-term development. In addition, the environmental pollution caused by fossil energy is not conducive to reducing global carbon emissions. For this reason, countries around the world are actively developing and exploring new clean energy, such as nuclear energy and solar energy. On the other hand, countries are also studying ways to improve energy utilization, such as the secondary utilization of low-grade energy such as waste heat and waste heat. The Stirling engine is a device that converts thermal energy into mechanical energy. It is a closed external combustion engine that can utilize almost all forms of thermal energy and has low requirements on the quality of the heat source. Combining it with a linear motor can realize the conversion of thermal energy into electrical energy, and no pollutants are generated during the energy conversion process. Therefore, the Stirling generator has a high research and application value.

[0003] According to its structure, Stirling generators can be divided into three types: crankshaft connecting rod type, diamond transmission type and free piston type. Among them, the free piston Stirling generator is widely studied because its piston only moves linearly without lateral force when working, and it has high reliability and low noise. The traditional free piston Stirling generator uses a piston and a leaf spring to form a vibration system to achieve power output. However, due to the limitation of its material, the leaf spring often suffers from mechanical fatigue and fracture as the vibration frequency and movement stroke increase, which affects the operating life of the Stirling generator. Therefore, the electromagnetic spring type Stirling generator structure is proposed, which uses electromagnetic springs to replace traditional leaf springs, completely overcomes the influence of mechanical fatigue on spring fracture, and greatly improves the life of the Stirling generator. However, the electromagnetic spring structure usually uses a linear motor to generate electromagnetic force when powered on to simulate the action of the spring, so there is only an axial spring elastic force and a lack of radial constraints perpendicular to the direction of piston movement, which causes axial displacement during piston movement, resulting in leakage and wear problems, and eventually causes the Stirling generator to shut down or even fail to start.

[0004] At present, there is no clear solution to the problem of lack of radial constraint on the piston of electromagnetic spring Stirling generator. The Institute of Physical and Chemical Technology of the Chinese Academy of Sciences proposed a passive gas bearing technology to overcome the friction between the power piston and the cylinder for the free piston Stirling generator with traditional leaf spring structure. The principle is to add a one-way valve in the direction of the working chamber of the power piston, so that it opens to achieve inflation when the pressure difference between the inside and outside of the power piston air bearing system is greater than the design threshold, and closes otherwise. When the pressure difference between the inside and outside is positive, an air film is formed in the gap to overcome friction. Although this method has a simple structure, the pressure change in the working chamber of the Stirling generator is determined by many factors such as the Stirling structure, the inflation pressure, and the temperature of the cold and hot ends. It is very difficult to select the threshold pressure for the opening of the one-way valve, and it often requires multiple tests to obtain the optimal threshold pressure, which is not universal. This passive air flotation structure cannot be directly applied to the electromagnetic spring Stirling generator. When the Stirling is started, the power piston lacks the initial pressure difference inside and outside, and the air film cannot be formed in the gap. The friction between the power piston and the cylinder is large, which easily leads to the failure of the Stirling generator to start. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned background technology and provide an active air-floating electromagnetic spring Stirling generator, which provides radial constraints for the power piston and the valve piston, can effectively reduce friction, and promote the starting and stable operation of the Stirling generator.

[0006] The technical solution adopted by the present invention to solve its technical problem is an active air-floating electromagnetic spring Stirling generator, including a Stirling generator body and an air pump. The Stirling generator body includes a gas distribution piston, a power piston, a cylinder, a first linear motor, and a second linear motor. The gas distribution piston and the power piston are arranged in the cylinder from top to bottom. A gas distribution piston connecting rod is provided at the lower end of the gas distribution piston. The power piston is sleeved in the gas distribution piston connecting rod. The gas distribution piston connecting rod passes through the second linear motor. The first linear motor is connected to the power piston, and the second linear motor is connected to the gas distribution piston; the gas distribution piston connecting rod is provided with a first air cavity structure, and the gas distribution piston connecting rod is provided with a first air cavity structure. A first air flotation gap is provided between the first linear motor and the second linear motor, and the first air cavity structure sprays air to form an air film at the first air flotation gap, and the force of the air film is used to make the gas piston connecting rod and the gas piston float at the center position; a second air cavity structure is provided in the power piston, a second air flotation gap is provided between the outer wall of the power piston and the inner wall of the cylinder, and a third air flotation gap is provided between the inner wall of the power piston and the gas piston connecting rod, and the second air cavity structure sprays air to form an air film at the second air flotation gap and the third air flotation gap, and the force of the air film is used to make the power piston, the gas piston connecting rod and the gas piston float at the center position; the air pump is connected to the first air cavity structure and the second air cavity structure.

[0007] Furthermore, the first air cavity structure is as follows: a hollow air cavity is provided in the air distribution piston connecting rod, a connecting rod air outlet hole is provided on the side wall of the air distribution piston connecting rod, the connecting rod air outlet hole is provided on the side wall where the air distribution piston connecting rod contacts the second linear motor, an inflation hole is provided at the bottom of the air distribution piston connecting rod, the inflation hole and the connecting rod air outlet hole are both connected to the air cavity; the air pump is connected to the inflation hole.

[0008] Furthermore, the second air cavity structure is as follows: a hollow air cavity is provided in the power piston, an outgoing air hole is provided on the outer wall of the power piston, an inner air outlet hole is provided on the inner wall of the power piston, and an inflation hole is provided at the bottom of the power piston; the outgoing air hole, the inner air outlet hole and the inflation hole are all connected to the air cavity; and the air pump is connected to the inflation hole.

[0009] Furthermore, the connecting rod air outlet hole of the valve piston connecting rod includes an injection hole and a throttling hole. The injection hole is connected to the throttling hole. The injection hole is bowl-shaped, and the throttling hole is straight. The aperture of the throttling hole is smaller than the aperture of the injection hole. The throttling hole is close to the air cavity of the valve piston connecting rod, and the injection hole is close to the air floating gap between the valve piston connecting rod and the second linear motor.

[0010] Further, the outgoing air hole and the inner air hole of the power piston include a first transition hole, an inner hole and a second transition hole. The first transition hole is connected to the inner hole, and the inner hole is connected to the second transition hole. The first transition hole is located on the inner side of the wall, and the second transition hole is located on the outer side of the wall. A fixing bolt with an air hole is provided in the inner hole. The air hole of the fixing bolt includes an air jet hole and a throttling air hole. The air jet hole is funnel-shaped, and the throttling air hole is straight-line-shaped. The aperture of the throttling air hole is smaller than the aperture of the air jet hole. The throttling air hole is connected to the first transition hole, and the air jet hole is connected to the second transition hole. The aperture of the first transition hole is larger than the aperture of the throttling air hole. The second transition hole is trumpet-shaped, and the aperture of the second transition hole is larger than the aperture of the air jet hole. For the outer wall of the power piston, the first transition hole is close to the air cavity of the power piston, and the second transition hole is close to the air floating gap between the cylinder and the power piston. For the inner wall of the power piston, the first transition hole is close to the air cavity of the power piston, and the second transition hole is close to the air floating gap between the power piston and the valve piston connecting rod.

[0011] Furthermore, it also includes an air pump power supply circuit, which includes a bidirectional inverter, an energy storage device and a DC-DC converter. The energy storage device is connected to the first linear motor through the bidirectional inverter, and the energy storage device is connected to the air pump through the DC-DC converter.

[0012] Furthermore, the size of the first air floating gap is set to be at most 35 um; the sizes of the second air floating gap and the third air floating gap are set to be at most 40 um.

[0013] Furthermore, the Stirling generator body also includes a heater, a regenerator, a cooler and an outer shell. The cylinder is arranged in the outer shell. The outer shell includes an upper shell and a bottom shell. The heater, the regenerator and the cooler are arranged from top to bottom between the cylinder and the upper shell. The space formed between the gas distribution piston and the upper shell is an expansion chamber, the space formed between the gas distribution piston and the power piston is a compression chamber, and the space formed between the power piston and the bottom shell is a back pressure chamber.

[0014] Furthermore, the first air floating structure composed of the first air cavity structure and the first air floating gap is located in the back pressure cavity.

[0015] Further, the first linear motor includes a first linear motor stator and a first linear motor mover, the first linear motor stator is installed on the outer shell through a fixing frame, and the first linear motor mover is sleeved on the outside of the power piston; the second linear motor includes a second linear motor stator and a second linear motor mover, the second linear motor stator is installed on the outer shell through a fixing frame, the second linear motor mover is fixed to the valve piston connecting rod, and the second linear motor mover and the second linear motor stator are sleeved on the lower part of the valve piston connecting rod.

[0016] Compared with the prior art, the advantages of the present invention are as follows:

[0017] By using the double air-floating bearing technology, the air cavity structure of the power piston and the air cavity structure of the gas distribution piston connecting rod are inflated to form an internal and external pressure difference to produce an air-floating effect, so that the power piston and the gas distribution piston are radially constrained, effectively reducing friction and promoting the starting and stable operation of the Stirling generator, greatly improving the reliability and service life of the double electromagnetic spring Stirling generator, and having extremely high application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an active air-floating electromagnetic spring Stirling generator according to an embodiment of the present invention.

[0019] Figure 2 yes Figure 1 A schematic structural diagram of the air outlet of the connecting rod of the illustrated embodiment.

[0020] Figure 3 yes Figure 1 A schematic diagram of the structure of the inner air outlet and the outer air outlet of the embodiment shown.

[0021] In the figure, 1 is a heater, 2 is a regenerator, 3 is a cooler, 4 is a gas distribution piston, 5 is a power piston, 6 is a first linear motor stator, 7 is a first linear motor mover, 8 is a second linear motor stator, 9 is a second linear motor mover, 10 is an expansion chamber, 11 is a compression chamber, 12 is a back pressure chamber, 13 is a cylinder, 14 is a connecting rod air outlet, 15 is an outgoing air hole, 16 is an inner air outlet, 17 is a second air cavity structure, 18 is an air pump, 19 is an energy storage device, 20 is a circuit, 21 is a bidirectional converter, 22 is a DC-DC converter, 23 is a first air path, 24 is a second air path, 25 is a first air cavity structure, 141 is an injection hole, 142 is a throttling hole, 151 is a fastening bolt with an air hole, 152 is a second transition hole, 153 is a first transition hole, and 154 is an inner hole. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figure 1 This embodiment includes a Stirling generator body, an air pump 18 and an air pump power supply circuit. The Stirling generator body is connected to the air pump 18, and the air pump 18 is connected to the air pump power supply circuit.

[0024] The Stirling generator body includes a heater 1, a regenerator 2, a cooler 3, a gas distribution piston 4, a power piston 5, a first linear motor, a second linear motor, a cylinder 13 and a shell. The cylinder 13 is arranged in the shell. The shell includes an upper shell and a bottom shell. The heater 1, the heater 2 and the cooler 3 are arranged between the cylinder 13 and the upper shell from top to bottom. The gas distribution piston 4 and the power piston 5 are arranged in the cylinder 13 from top to bottom. The lower end of the gas distribution piston 4 is provided with a gas distribution piston connecting rod. The power piston 5 is sleeved in the gas distribution piston connecting rod. The space formed between the gas distribution piston 4 and the upper shell is an expansion chamber 10, the space formed between the gas distribution piston 4 and the power piston 5 is a compression chamber 11, and the space formed between the power piston 5 and the bottom shell is a back pressure chamber 12. The gas distribution piston connecting rod passes through the second linear motor, the first linear motor is connected to the power piston 5, and the second linear motor is connected to the gas distribution piston 4. The air pump 18 is located in the back pressure chamber 12 and is fixed on the bottom shell.

[0025] A first air cavity structure 25 is provided in the gas distribution piston connecting rod, and a first air floating gap is provided between the gas distribution piston connecting rod and the inner wall of the second linear motor stator 8. The first air cavity structure 25 sprays air to form an air film at the first air floating gap, and the force of the air film is used to make the gas distribution piston connecting rod and the gas distribution piston 4 float at the center position; the first air cavity structure 25 and the first air floating gap The first air floating structure composed of the first air cavity structure 25 and the first air floating gap is located in the back pressure cavity 12; a second air cavity structure 17 is provided in the power piston 5, a second air floating gap is provided between the outer wall of the power piston 5 and the inner wall of the cylinder 13, and a third air floating gap is provided between the inner wall of the power piston 5 and the gas distribution piston connecting rod. The second air cavity structure 17 sprays air to form an air film at the second air floating gap and the third air floating gap, and the force of the air film is used to make the power piston 5, the gas distribution piston connecting rod, and the gas distribution piston 4 float at the center position, the air pump 18 is connected to the first air cavity structure 25 of the gas distribution piston connecting rod through the first air path 23, and the air pump 18 is connected to the second air cavity structure 17 of the power piston 5 through the second air path 24.

[0026] Both the first linear motor and the second linear motor are cylindrical moving magnet permanent magnet motors. The first linear motor includes a first linear motor stator 6 and a first linear motor mover 7. The first linear motor stator 6 is installed on the outer shell through a fixed frame, and the first linear motor mover 7 is sleeved on the outside of the power piston 5; the second linear motor includes a second linear motor stator 8 and a second linear motor mover 9. The second linear motor stator 8 is installed on the outer shell through a fixed frame, and the second linear motor mover 9 is fixed to the valve piston connecting rod. The second linear motor mover 9 and the second linear motor stator 8 are sleeved on the lower part of the valve piston connecting rod.

[0027] The first air cavity structure 25 of the gas distribution piston connecting rod is: a hollow air cavity is provided in the gas distribution piston connecting rod, and a plurality of connecting rod air outlet holes 14 are provided at intervals on the side walls of the gas distribution piston connecting rod. The plurality of connecting rod air outlet holes 14 are provided at intervals on the side walls where the gas distribution piston connecting rod contacts the stator 8 of the second linear motor. An inflation hole is provided at the bottom of the gas distribution piston connecting rod, and the inflation hole and the connecting rod air outlet hole 14 are both connected to the air cavity, and the first air path 23 is connected to the air cavity through the inflation hole.

[0028] The connecting rod air outlet 14 of the gas distribution piston connecting rod emits air to form an air film at the first air floating gap between the connecting rod of the gas distribution piston and the inner wall of the second linear motor stator 8. When the gas distribution piston 4 deviates to one side, the air floating gap on the deviated side will become smaller, and the reaction force formed by the gas ejected from the air outlet on this side acting on the second linear motor stator 8 will increase. On the other side, due to the increase in the air floating gap, the reaction force formed by the gas ejected from the air outlet on this side acting on the second linear motor stator 8 will decrease, so that the gas distribution piston connecting rod drives the gas distribution piston 4 to move in the direction of the larger air floating gap, realizing the air floating effect of the gas distribution piston 4, and finally making the gas distribution piston connecting rod and the gas distribution piston 4 float at the center position, that is, the center line of the gas distribution piston connecting rod, the center line of the gas distribution piston 4 and the center line of the cylinder 13 coincide. The structure of the connecting rod air outlet 14 of the gas distribution piston connecting rod is as follows: Figure 2 As shown, it includes an air jet hole 141 and a throttle air hole 142, the air jet hole 141 is connected with the throttle air hole 142, the air jet hole 141 is bowl-shaped, the throttle air hole 142 is linear, the aperture of the throttle air hole 142 is smaller than the aperture of the air jet hole 141, the throttle air hole 142 is close to the air cavity of the gas distribution piston connecting rod, and the air jet hole 141 is close to the air floating gap between the gas distribution piston connecting rod and the inner wall of the second linear motor stator 8. The air jet hole 141 is designed to be bowl-shaped in order to increase the air floating area and improve the air floating performance, and the size of the first air floating gap is set to be at most 35um.

[0029] The second air cavity structure 17 of the power piston 5 is as follows: a hollow air cavity is provided in the power piston 5, a plurality of outgoing air holes 15 are provided on the outer wall of the power piston 5 at intervals along the circumferential direction, a plurality of internal air outlet holes 16 are provided on the inner wall of the power piston 5 at intervals along the circumferential direction, an inflation hole is provided at the bottom of the power piston 5, the internal air outlet holes 16, the inflation hole and the outgoing air holes 15 are all connected to the air cavity, and the second air path 24 is connected to the air cavity through the inflation hole.

[0030] The structures of the inner air outlet 16 and the outer air outlet 15 of the power piston 5 are as follows: Figure 3 As shown, it includes a first transition hole 153, an inner hole 154, and a second transition hole 152. The first transition hole 153 is connected to the inner hole 154, and the inner hole 154 is connected to the second transition hole 152. The first transition hole 153 is located on the inner side of the wall, and the second transition hole 152 is located on the outer side of the wall. A fixing bolt 151 with an air hole is provided in the inner hole 154. The air hole of the fixing bolt includes an air jet hole and a throttling air hole. The air jet hole is funnel-shaped, and the throttling air hole is linear. The aperture of the throttling air hole is smaller than the aperture of the air jet hole. The throttling air hole is connected to the first transition hole 153, and the air jet hole is connected to the second transition hole 152. The aperture of the first transition hole 153 is larger than the aperture of the throttling air hole of the fixing bolt. The second transition hole 152 is trumpet-shaped, and the aperture of the second transition hole 152 is larger than the aperture of the air jet hole.

[0031] The first transition hole 153 and the second transition hole 152 are designed to improve the air intake efficiency and increase the air film area formed by the air outlet, thereby improving the performance of the air bearing. Figure 3 For example, for the outer wall of the power piston 5, the first transition hole 153 is close to the air cavity of the power piston 5, and the second transition hole 152 is close to the air floating gap between the cylinder 13 and the power piston 5; for the inner wall of the power piston 5, the first transition hole 153 is close to the air cavity of the power piston 5, and the second transition hole 152 is close to the air floating gap between the power piston 5 and the gas distribution piston connecting rod. The size of the second air floating gap and the third air floating gap is set to be at most 40um.

[0032] The outgoing air hole 15 on the outer wall of the power piston 5 ejects air to form an air film at the second air flotation gap between the outer wall of the power piston 5 and the inner wall of the cylinder 13. The inner air outlet 16 on the inner wall of the power piston 5 ejects air to form an air film at the third air flotation gap between the inner wall of the power piston 5 and the gas piston connecting rod. When the power piston 5 deviates to one side, the gap between the cylinder 13 and the outer wall of the power piston 5 in the deviating direction will be reduced, resulting in increased pressure, while the pressure on the other side will decrease due to the increased gap, which will eventually cause the power piston 5 to float in the center position, that is, the center line of the power piston 5 coincides with the center line of the cylinder 13. Similarly, it can be concluded that the air flotation effect between the inner wall of the power piston 5 and the gas piston connecting rod will cause the gas piston connecting rod and the gas piston 4 to float in the center position, that is, the center line of the gas piston connecting rod and the gas piston 4 coincide with the center line of the cylinder 13.

[0033] The present invention enables the first air cavity structure 25 on the gas distribution piston connecting rod and the second air cavity structure 17 on the power piston 5 to simultaneously act on the gas distribution piston connecting rod, so that the gas distribution piston connecting rod floats better at the center position, thereby enabling the gas distribution piston 4 to float better at the center position.

[0034] The air pump power supply circuit includes a bidirectional converter 21, an energy storage device 19 and a DC-DC converter 22, and the structure is as follows: Figure 1As shown. The energy storage device 19 can be a lead-acid battery or a lithium-ion battery. The energy storage device 19 is connected to the first linear motor through a bidirectional converter 21, which is responsible for starting the Stirling generator and powering the air pump 18, and storing the electrical energy generated by the Stirling generator when it is working. The energy storage device 19 is connected to the air pump 18 through a DC-DC converter 22. The DC-DC converter 22 generally uses a Buck circuit topology to provide the air pump 18 with direct current of the required voltage. The components of the air pump power supply circuit are connected through a line 20. When the electromagnetic spring Stirling generator is initially started, on the one hand, the bidirectional converter 21 inverts the electrical energy in the energy storage device 19 to obtain single-phase alternating current and connects it to the first linear motor, drives the power piston 5 to move up and down to form a pressure wave, drives the valve piston 4 to move to the minimum valve stroke, and the Stirling generator is successfully started. On the other hand, the DC-DC converter 22 converts the high-voltage DC in the energy storage device 19 into a suitable low-voltage DC through PWM modulation to drive the air pump 18 to work, inflate the air cavity structure of the power piston 5 and the air cavity structure of the distribution piston connecting rod to form an internal and external pressure difference to produce an air flotation effect, provide radial support for the distribution piston 4 and the power piston 5, and at the same time greatly reduce friction to promote the starting and stable operation of the Stirling generator.

[0035] The present invention uses dual-piston air flotation active air flotation to solve the problems of lack of radial support and high friction of the electromagnetic spring Stirling generator gas piston 4 and power piston 5, and the gas piston connecting rod air flotation is designed in the back pressure chamber to prevent the pressure wave change in the working chamber from being changed due to the air flotation effect, thereby affecting the working state of the Stirling generator and causing shutdown. At the same time, the present invention uses the dual electromagnetic spring Stirling generator to output electrical energy to drive the air pump 18 to work via the converter, which makes it unnecessary to install an additional power supply to the air pump 18 for the shock absorber, and at the same time uses the energy storage device 19 to provide the air pump 18 with initial power supply energy, which significantly improves the working life of the Stirling generator and reduces the difficulty of starting.

[0036] Those skilled in the art may make various modifications and variations to the present invention. If these modifications and variations are within the scope of the claims of the present invention and their equivalents, then these modifications and variations are also within the protection scope of the present invention.

[0037] The contents not described in detail in the specification are prior art known to those skilled in the art.

Claims

1. An active air-floating electromagnetic spring Stirling generator, characterized in that: The invention comprises a Stirling generator body and an air pump. The Stirling generator body comprises a gas distribution piston, a power piston, a cylinder, a first linear motor and a second linear motor. The gas distribution piston and the power piston are arranged in the cylinder from top to bottom in sequence. A gas distribution piston connecting rod is arranged at the lower end of the gas distribution piston. The power piston is sleeved in the gas distribution piston connecting rod. The gas distribution piston connecting rod passes through the second linear motor. The first linear motor is connected to the power piston, and the second linear motor is connected to the gas distribution piston. A first air cavity structure is arranged in the gas distribution piston connecting rod. A first air floating gap is arranged between the gas distribution piston connecting rod and the second linear motor. The first air cavity structure sprays air to form an air film at the first air flotation gap, and the force of the air film is used to make the gas piston connecting rod and the gas piston float at the center position; a second air cavity structure is provided in the power piston, a second air flotation gap is provided between the outer wall of the power piston and the inner wall of the cylinder, and a third air flotation gap is provided between the inner wall of the power piston and the gas piston connecting rod. The second air cavity structure sprays air to form an air film at the second air flotation gap and the third air flotation gap, and the force of the air film is used to make the power piston, the gas piston connecting rod and the gas piston float at the center position; the air pump is connected to the first air cavity structure and the second air cavity structure; The first air cavity structure is as follows: a hollow air cavity is provided in the gas distribution piston connecting rod, a connecting rod air outlet hole is provided on the side wall of the gas distribution piston connecting rod, the connecting rod air outlet hole is provided on the side wall where the gas distribution piston connecting rod contacts the second linear motor, an inflation hole is provided at the bottom of the gas distribution piston connecting rod, the inflation hole and the connecting rod air outlet hole are both connected to the air cavity; the air pump is connected to the inflation hole; the connecting rod air outlet hole of the gas distribution piston connecting rod includes an air jet hole and a throttling air hole, the air jet hole is connected to the throttling air hole, the air jet hole is bowl-shaped, the throttling air hole is linear, the aperture of the throttling air hole is smaller than the aperture of the air jet hole, the throttling air hole is close to the gas distribution piston connecting rod air cavity, and the air jet hole is close to the air floating gap between the gas distribution piston connecting rod and the second linear motor; The second air cavity structure is as follows: a hollow air cavity is provided in the power piston, an outgoing air hole is provided on the outer wall of the power piston, an inner air outlet hole is provided on the inner wall of the power piston, and an inflation hole is provided at the bottom of the power piston, and the outgoing air hole, the inner air outlet hole and the inflation hole are all connected to the air cavity; the air pump is connected to the inflation hole; the outgoing air hole and the inner air outlet hole of the power piston include a first transition hole, an inner hole and a second transition hole, the first transition hole is connected to the inner hole, the inner hole is connected to the second transition hole, the first transition hole is located on the inner side of the wall, the second transition hole is located on the outer side of the wall, a fixing bolt with an air hole is provided in the inner hole, and the air hole of the fixing bolt includes an air jet hole and a throttling hole The air hole and the jet hole are funnel-shaped, the throttling air hole is straight-line-shaped, the aperture of the throttling air hole is smaller than that of the jet hole, the throttling air hole is connected to the first transition hole, the jet hole is connected to the second transition hole, the aperture of the first transition hole is larger than that of the throttling air hole, the second transition hole is trumpet-shaped, and the aperture of the second transition hole is larger than that of the jet hole; for the outer wall of the power piston, the first transition hole is close to the air cavity of the power piston, and the second transition hole is close to the air floating gap between the cylinder and the power piston; for the inner wall of the power piston, the first transition hole is close to the air cavity of the power piston, and the second transition hole is close to the air floating gap between the power piston and the gas distribution piston connecting rod.

2. The active air-floating electromagnetic spring Stirling generator according to claim 1, characterized in that: It also includes an air pump power supply circuit, which includes a bidirectional inverter, an energy storage device and a DC-DC converter. The energy storage device is connected to the first linear motor through the bidirectional inverter, and the energy storage device is connected to the air pump through the DC-DC converter.

3. The active air-floating electromagnetic spring Stirling generator according to claim 1, characterized in that: The size of the first air floating gap is set to be at most 35 um; the sizes of the second air floating gap and the third air floating gap are set to be at most 40 um.

4. The active air-floating electromagnetic spring Stirling generator according to claim 1, characterized in that: The Stirling generator body also includes a heater, a regenerator, a cooler and an outer shell. The cylinder is arranged in the outer shell. The outer shell includes an upper shell and a bottom shell. The heater, the regenerator and the cooler are arranged from top to bottom between the cylinder and the upper shell. The space formed between the gas distribution piston and the upper shell is an expansion chamber, the space formed between the gas distribution piston and the power piston is a compression chamber, and the space formed between the power piston and the bottom shell is a back pressure chamber.

5. The active air-floating electromagnetic spring Stirling generator according to claim 4, characterized in that: The first air floating structure composed of the first air cavity structure and the first air floating gap is located in the back pressure cavity.

6. The active air-floating electromagnetic spring Stirling generator according to claim 4, characterized in that: The first linear motor includes a first linear motor stator and a first linear motor mover, the first linear motor stator is installed on the outer shell through a fixing frame, and the first linear motor mover is sleeved on the outside of the power piston; the second linear motor includes a second linear motor stator and a second linear motor mover, the second linear motor stator is installed on the outer shell through a fixing frame, the second linear motor mover is fixed to the valve piston connecting rod, and the second linear motor mover and the second linear motor stator are sleeved on the lower part of the valve piston connecting rod.

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