Free piston stirling engine system with built-in gas compression device

Abstract

The application relates to the technical field of free piston Stirling generators, and provides a free piston Stirling power generation system with built-in air compression devices, which comprises a heat source, a Stirling generator, air compression devices and a helium heat transfer pipeline. The helium heat transfer pipeline sequentially passes through the heat source and the Stirling generator, so that heat transfer gas in the helium heat transfer pipeline is heated by the heat source and then supplied to the Stirling generator to generate heat and power. The air compression devices are arranged in the expansion cavity of the Stirling generator, and the kinetic energy of a phase adjuster in the Stirling generator is used to provide air compression driving force, so that the structure of the Stirling power generation system is simplified, and the air compression devices do not need to rely on other additional driving components. The helium heat transfer pipeline adopts a gas medium, high-pressure gas generated by the helium heat transfer pipeline is directly coupled with the heat source for heat exchange, and the corrosion of other heat transfer mediums (for example, molten salt, liquid metal and the like) to the heat head structure does not need to be considered. The free piston Stirling power generation system has the advantages of simple and compact structure, wide heat source adaptability and high thermoelectric efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of free piston Stirling generator, in particular to a free piston Stirling power generation system with built-in air compression device. BACKGROUND

[0002] The free piston Stirling generator is a new type of thermoelectric conversion device with high efficiency and long service life. It is coupled by a free piston Stirling engine and a linear oscillation motor. It converts heat energy into acoustic energy in the reciprocating oscillation of the compressible fluid through the thermoacoustic effect, thereby driving the power piston to reciprocate and cut the magnetic lines of force to generate alternating current. With the increasing demand for space exploration, the free piston Stirling generator has gradually attracted attention due to its high efficiency, high reliability, long service life and other advantages.

[0003] At present, in the free piston Stirling power generation system, in order to reduce the heat radiation of the heat source to the heat exchanger, two heat transfer circuits are arranged between the Stirling generator and the heat source to realize heat transfer, that is, the first circuit is first heat-exchanged with the heat source, and the second circuit is heat-exchanged with the first circuit and then heat-exchanged with the Stirling generator to generate power. At the same time, in order to increase the heat transfer efficiency, a high specific heat fluid (such as molten salt, liquid metal, etc.) is usually added as a circulating medium in the second circuit to absorb the heat of the external heat source.

[0004] However, the two-circuit heat transfer cycle increases the complexity of the system, and the molten salt, liquid metal and other circulating media have serious corrosiveness, which can cause serious damage to the generator hot head, reducing the working reliability and service life of the entire generator. SUMMARY

[0005] Therefore, the present application provides a free piston Stirling power generation system with built-in air compression device to solve or at least partially solve the technical defects in the prior art.

[0006] The present application provides a free piston Stirling power generation system with built-in air compression device, comprising:

[0007] a heat source;

[0008] a Stirling generator comprising a shell and a phase adjuster, the phase adjuster being arranged in the shell and being separated from the inner wall of the shell on one side of the shell to form an expansion chamber;

[0009] an air compression device comprising an air compression piston and an air compression chamber, the air compression chamber being arranged in the expansion chamber, the air compression piston being movably arranged in the air compression chamber, the air compression piston being connected with the phase adjuster so that the air compression piston can reciprocate along the axial direction of the air compression chamber, the air compression chamber being filled with the same helium gas as the interior of the Stirling generator (1), the air compression chamber having an outlet and an inlet;

[0010] A helium heat transfer pipeline is connected to the outlet at one end and to the inlet at the other end, and sequentially passes through the heat source and the Stirling generator, so that the heat transfer gas in the helium heat transfer pipeline is heated by the heat source and then supplied to the Stirling generator for heat transfer and power generation.

[0011] According to the free-piston Stirling power generation system with built-in air compression device, the outlet and the helium heat transfer pipeline are connected through a first one-way conducting member, and the conducting direction of the first one-way conducting member is from the outlet to one end of the helium heat transfer pipeline.

[0012] According to the free-piston Stirling power generation system with built-in air compression device, the inlet and the helium heat transfer pipeline are connected through a second one-way conducting member, and the conducting direction of the second one-way conducting member is from the other end of the helium heat transfer pipeline to the inlet.

[0013] According to the free-piston Stirling power generation system with built-in air compression device, the first one-way conducting member and the second one-way conducting member are both one-way valves.

[0014] According to the free-piston Stirling power generation system with built-in air compression device, the compression piston and the compression cavity are gap sealed, so that the average pressure between the expansion cavity and the compression cavity is consistent.

[0015] According to the free-piston Stirling power generation system with built-in air compression device, the heat source is one of nuclear heat, solar heat, industrial waste heat and fuel combustion heat.

[0016] According to the free-piston Stirling power generation system with built-in air compression device, the ratio of the volume of the compression cavity to the swept volume of the compression piston is 1.5-3.

[0017] According to the free-piston Stirling power generation system with built-in air compression device, the Stirling generator further comprises:

[0018] A thermoacoustic unit is arranged between the phase adjuster and the radial inner wall of the shell, and the thermoacoustic unit is used to generate acoustic power, and the phase adjuster can reciprocate along the thermoacoustic unit under the action of the acoustic power;

[0019] A power piston is arranged in the shell, and the power piston is arranged on the side of the phase adjuster away from the expansion cavity, and a compression cavity is separated between the power piston and the phase adjuster, and the power piston is connected to the phase adjuster through a connecting rod;

[0020] A linear motor is arranged between the power piston and the radial inner wall of the shell.

[0021] The elastic member is arranged in the other side of the shell opposite to the expansion cavity, and the connecting rod is connected with the elastic member.

[0022] According to the free-piston Stirling power generation system with built-in compression device provided by the application, the elastic member is a column spring or a plate spring.

[0023] According to the free-piston Stirling power generation system with built-in compression device provided by the application, the thermo-acoustic unit comprises a low-temperature heat exchanger, a regenerator and a high-temperature heat exchanger, and the low-temperature heat exchanger, the regenerator and the high-temperature heat exchanger are sequentially arranged from the compression cavity to the expansion cavity.

[0024] The free-piston Stirling power generation system with built-in compression device provided by the application comprises a heat source, a Stirling generator, a compression device and a helium heat transfer pipeline. The compression device comprises a compression piston and a compression cavity. One end of the helium heat transfer pipeline is connected with an outlet, and the other end is connected with an inlet. The helium heat transfer pipeline sequentially passes through the heat source and the Stirling generator, so that the heat transfer gas in the helium heat transfer pipeline is heated by the heat source and then supplied to the Stirling generator to generate heat and electricity. The helium heat transfer pipeline is directly communicated with the compression cavity, and the compression driving force is provided by the kinetic energy of the phase adjuster in the Stirling generator, without relying on other additional driving components. The structure of the Stirling power generation system is simplified, the helium heat transfer pipeline adopts a gas medium, the high-pressure gas generated is directly coupled with the heat source for heat exchange, the corrosion of other heat transfer mediums (such as molten salt and liquid metal) on the heat head structure does not need to be considered, and the structure is simple and compact, the heat source is widely adaptable, and the thermoelectric efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0026] Figure 1 FIG. 1 is a structural schematic diagram of the free-piston Stirling power generation system with built-in compression device in the embodiment of the application;

[0027] Figure 2 FIG. 2 is another structural schematic diagram of the free-piston Stirling power generation system with built-in compression device in the embodiment of the application;

[0028] Figure 3 FIG. 3 is another structural schematic diagram of the free-piston Stirling power generation system with built-in compression device in the embodiment of the application.

[0029] Reference signs:

[0030] 1. Stirling generator; 11. Housing; 12. Phase adjuster; 13. Expansion chamber; 14. Thermoacoustic unit; 141. Low-temperature heat exchanger; 142. Recuperator; 143. High-temperature heat exchanger; 15. Power piston; 16. Compression chamber; 17. Connecting rod; 18. Linear motor; 19. Elastic member;

[0031] 2. Compressor; 21. Compressor piston; 22. Compressor chamber; 23. Outlet; 24. Inlet;

[0032] 3. Helium heat transfer pipeline; 31. First one-way conducting member; 32. Second one-way conducting member;

[0033] 4. Core;

[0034] 5. Combustion chamber;

[0035] 6. Reflective concentrator. DETAILED DESCRIPTION

[0036] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] In the description of the present application, it should be understood that the terms "upper", "lower", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0038] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0039] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0040] The free piston Stirling generator is a new type of thermoelectric conversion device with high efficiency and long service life, which is coupled by a free piston Stirling engine and a linear oscillation motor, and converts heat energy into acoustic energy of the compressible fluid in reciprocating oscillation through the thermoacoustic effect, so as to drive the dynamic piston to drive the magnet to reciprocate to cut the magnetic force line to generate alternating current. With the increasing demand for space exploration, the free piston Stirling generator is gradually valued due to its high efficiency, high reliability and long service life.

[0041] At present, in the free piston Stirling generator system, in order to reduce the heat radiation of the heat source to the heat exchanger, the Stirling generator and the heat source are coupled by setting two heat transfer circuits, that is, the first circuit is coupled with the heat source for heat transfer, the second circuit is coupled with the first circuit for heat transfer, and then the second circuit is coupled with the Stirling generator for heat transfer to generate electricity. At the same time, in order to increase the heat transfer efficiency, a high specific heat fluid (such as molten salt, liquid metal, etc.) is usually added as a circulating medium in the second circuit to absorb the heat of the heat source.

[0042] However, the two-circuit heat transfer cycle increases the complexity of the system, and the molten salt, liquid metal and other circulating media have serious corrosiveness, which seriously damages the generator hot head, reduces the working reliability and service life of the entire generator.

[0043] In the embodiment of the present application, a compression chamber is additionally arranged in the expansion chamber of the Stirling generator, and the helium heat transfer pipeline is directly communicated with the compression chamber, and the driving force of the compression is provided by the kinetic energy of the phase adjuster in the Stirling generator, without relying on other additional driving components, so that the structure of the Stirling generator system is simplified, and the helium heat transfer pipeline adopts gas medium, the high-pressure gas generated is directly coupled with the heat source for heat exchange, without considering the corrosion of other heat transfer media (such as molten salt, liquid metal, etc.) to the structure of the hot head, and has the advantages of simple and compact structure, wide heat source adaptability and high thermoelectric efficiency.

[0044] As shown in Figure 1 The free piston Stirling generator system with the built-in compression device provided by the embodiment of the present application comprises a heat source, a Stirling generator 1, a compression device 2 and a helium heat transfer pipeline 3, and the available heat source includes any one of nuclear heat, solar heat, industrial waste heat and fuel combustion heat. The heat source in the embodiment adopts nuclear heat.

[0045] The stirling generator 1 comprises a casing 11 and a phase adjuster 12, the phase adjuster 12 is arranged in the casing 11 and is separated from the inner wall of the casing 11 on one side of the casing 11 to form an expansion cavity 13, the pressurizing device 2 comprises a pressurizing piston 21 and a pressurizing cavity 22, the pressurizing cavity 22 is arranged in the expansion cavity 13, the pressurizing piston 21 is movably arranged in the pressurizing cavity 22, the pressurizing piston 21 is connected with the phase adjuster 12, so that the pressurizing piston 21 can reciprocate along the axial direction of the pressurizing cavity 22, the pressurizing cavity 22 is filled with high-pressure helium, the pressure value of the high-pressure helium is 5-15 MPa, the pressurizing cavity 22 is provided with an outlet 23 and an inlet 24. Wherein, the internal working gas of the stirling generator 1 is also high-pressure helium, so as to ensure that the filling gas in the pressurizing cavity 22 is the same as the internal working gas of the stirling generator 1.

[0046] One end of the helium heat transfer pipeline 3 is connected with the outlet 23, and the other end is connected with the inlet 24, the helium heat transfer pipeline 3 sequentially passes through the core 4 and the stirling generator 1, so that the high-pressure helium in the helium heat transfer pipeline 3 is heated by the core 4 and then supplied to the stirling generator 1 to generate heat and electricity.

[0047] Specifically, when the free piston stirling generator system with the built-in pressurizing device is in normal operation, the phase adjuster 12 in the stirling generator 1 drives the pressurizing piston 21 to reciprocate in the pressurizing cavity 22, so as to form a sinusoidal pressure fluctuation in the pressurizing cavity 22, the pressure fluctuation enters the helium heat transfer pipeline 3 through the outlet 23 of the pressurizing cavity 22, so that the helium heat transfer pipeline 3 generates a stable high-pressure gas direct current, thereby entering the core 4 to absorb heat, the high-pressure gas transfers the heat to the stirling generator 1 through the helium heat transfer pipeline 3 to generate heat and electricity, the high-pressure gas after heat transfer returns to the pressurizing cavity 22 through the helium heat transfer pipeline 3 and the inlet 24, and finally completes a heat transfer loop, and the gas completes non-resonant self-circulation heat transfer between the pressurizing cavity 22, the helium heat transfer pipeline 3 and the heat source, without relying on other additional driving components.

[0048] In the embodiment, the pressurizing cavity 22 is additionally arranged in the expansion cavity 13 of the stirling generator 1, the helium heat transfer pipeline 3 is directly communicated with the pressurizing cavity 22, the pressurizing driving force is provided by the kinetic energy of the phase adjuster 12 in the stirling generator 1, without relying on other additional driving components, so as to simplify the structure of the stirling generator system, and the helium heat transfer pipeline 3 adopts gas medium, the generated high-pressure gas direct current is directly coupled with the heat source for heat exchange, without considering the corrosion of other heat transfer mediums (such as molten salt, liquid metal, etc.) to the heat head structure, so as to have the advantages of simple and compact structure, wide heat source adaptability and high thermoelectric efficiency.

[0049] In some embodiments of the present application, the outlet 23 and the helium heat transfer pipeline 3 are connected through a first one-way conducting member 31, and the conducting direction of the first one-way conducting member 31 is from the outlet 23 to one end of the helium heat transfer pipeline 3. The first one-way conducting member 31 is an element that only allows the gas medium in the pressurized cavity 22 to flow from the outlet 23 to one end of the helium heat transfer pipeline 3, and prevents the reverse direction flow, which can be a check valve or a one-way valve, and is not limited in the present embodiment. The purpose of arranging the first one-way conducting member 31 between the outlet 23 and the helium heat transfer pipeline 3 is to block the pressure fluctuation in the pressurized cavity 22 to prevent the gas in the helium heat transfer pipeline 3 from entering the helium heat transfer pipeline 3, so that the sound work loss in the helium heat transfer pipeline 3 is greatly reduced, and the introduction of the helium heat transfer pipeline 3 will not cause the invalid volume of the generator to increase and affect the power generation performance, further improving the working efficiency of the Stirling power generation system.

[0050] In some other embodiments of the present application, the inlet 24 and the helium heat transfer pipeline 3 are connected through a second one-way conducting member 32, and the conducting direction of the second one-way conducting member 32 is from the other end of the helium heat transfer pipeline 3 to the inlet 24. The second one-way conducting member 32 is an element that only allows the gas medium in the helium heat transfer pipeline 3 to flow from the other end of the helium heat transfer pipeline 3 to the inlet 24, and prevents the reverse direction flow, which can be a check valve or a one-way valve, and is not limited in the present embodiment. The purpose of arranging the second one-way conducting member 32 between the inlet 24 and the helium heat transfer pipeline 3 is also to block the pressure fluctuation in the pressurized cavity 22 to prevent it from entering the high-pressure helium heat transfer pipeline 3, so that the sound work loss in the helium heat transfer pipeline 3 is greatly reduced, and the introduction of the helium heat transfer pipeline 3 will not cause the invalid volume of the generator to increase and affect the power generation performance, further improving the working efficiency of the Stirling power generation system.

[0051] In some embodiments of the present application, the first one-way conducting member 31 and the second one-way conducting member are preferably one-way valves.

[0052] In order to reduce the aperture of the one-way valve for easier processing, the first one-way conducting member 31 can be arranged as a plurality of small-aperture one-way valves in parallel, that is, the outlet 23 of the pressurized cavity 22 is also arranged as a plurality of outlets, and a one-way valve is arranged between each outlet 23 and the helium heat transfer pipeline 3, and two one-way valves are preferably arranged in the present embodiment to simplify the system.

[0053] Similarly, the second one-way conducting member 32 can be arranged as a plurality of small-aperture one-way valves in parallel, that is, the inlet 24 of the pressurized cavity 22 is also arranged as a plurality of inlets, and a one-way valve is arranged between each inlet 24 and the helium heat transfer pipeline 3, and two one-way valves are preferably arranged in the present embodiment to simplify the system.

[0054] In some embodiments of the present application, the gap seal is provided between the compression piston 21 and the compression chamber 22, so that the average pressure between the expansion chamber 13 and the compression chamber 22 is kept consistent. The working gas of the Stirling generator 1 is circulated, which on one hand solves the problem of corrosion of the heat head structure by corrosive heat transfer medium such as molten salt and liquid metal, and on the other hand eliminates the need for external driving pump and other components, greatly reducing the complexity and operation cost of the system.

[0055] In some embodiments of the present application, the filling gas in the compression chamber 22 is preferably helium, and the working gas of the Stirling generator 1 is usually high-pressure helium. In this embodiment, the high-pressure helium of the Stirling generator 1 is circulated, and the kinetic energy of the phase adjuster 12 provides the compression driving force, without relying on other additional driving components, simplifying the structure of the Stirling power generation system. Moreover, the helium gas heat transfer pipeline 3 uses helium as the heat transfer medium, and the generated high-pressure helium is directly coupled with the heat source for heat exchange, without considering the corrosion of other heat transfer medium (such as molten salt, liquid metal, etc.) to the heat head structure. That is, the internal circulating working medium of the Stirling generator 1 is helium, and the working medium in the external helium heat transfer pipeline 3 is also helium. In addition, due to the one-way conduction of the one-way valve, there is no sound work loss caused by significant pressure fluctuation in the heat transfer loop. The whole machine has the advantages of simple and compact structure, wide heat source adaptability, and high thermoelectric efficiency.

[0056] As shown in Figure 2 , the heat source in the Stirling power generation system in this embodiment is the combustion biomass energy generated in the combustion chamber 5, and the other structures and working principles of the Stirling power generation system are the same as those in the above embodiments, which will not be described here. The helium in the helium heat transfer pipeline 3 is directly coupled with the combustion biomass energy generated in the combustion chamber 5 for heat transfer, which can obtain a larger combustion-flow coupling heat transfer area and has a higher heat transfer efficiency, further improving the working efficiency of the Stirling power generation system.

[0057] As shown in Figure 3 , the heat source in the Stirling power generation system in this embodiment is the solar energy collected in the reflecting concentrator 6, and the other structures and working principles of the Stirling power generation system are the same as those in the above embodiments, which will not be described here. The helium in the helium heat transfer pipeline 3 is directly coupled with the solar energy in the reflecting concentrator 6 for heat transfer, which can obtain a large enough solar heat transfer area, has a simple and compact structure, and has a high heat transfer efficiency, further improving the performance of the Stirling power generation system.

[0058] As shown in Figure 1As shown, in some embodiments of the present application, the ratio of the volume of the compression cavity 22 to the swept volume of the compression piston 21 is 1.5-3 times, wherein the swept volume of the compression piston 21 is the volume swept by the compression piston 21 from one dead center to the other, and in the present embodiment, the swept volume of the compression piston 21 is the product of the cross-sectional area of the compression piston 21 and the amplitude of the oscillation speed of the compression piston 21. The purpose of making the volume of the compression cavity 22 greater than the swept volume of the compression piston 21 is to prevent the compression piston 21 from colliding with the inner wall of the farthest end of the compression cavity 22, and to ensure the gas pressure in the compression cavity 22, so that the gas can complete the non-resonant self-circulating heat transfer between the compression cavity 22, the helium heat transfer pipeline 3 and the heat source, without relying on other additional driving components. In some embodiments of the present application, the Stirling generator 1 further comprises a thermoacoustic unit 14, a power piston 15, a linear motor 18 and an elastic member 19. The thermoacoustic unit 14 is arranged between the phase adjuster 12 and the radial inner wall of the housing 11, and the thermoacoustic unit 14 is used to generate acoustic power. Under the action of the acoustic power, the phase adjuster 12 can reciprocate along the thermoacoustic unit 14.

[0059] The power piston 15 is arranged in the housing 11, and the power piston 15 is arranged on the side of the phase adjuster 12 away from the expansion cavity 13. The power piston 15 and the phase adjuster 12 are separated by a compression cavity 16. The power piston 15 is connected to the phase adjuster 12 through a connecting rod 17. The linear motor 18 is arranged between the power piston 15 and the radial inner wall of the housing 11. The elastic member 19 is arranged in the housing 11 on the side opposite to the expansion cavity 13. The connecting rod 17 is connected to the elastic member 19.

[0060] Further, the thermoacoustic unit 14 comprises a low-temperature heat exchanger 141, a regenerator 142 and a high-temperature heat exchanger 143, which are arranged in sequence from the compression cavity 16 to the expansion cavity 13.

[0061] The working principle of the Stirling power generation system is as follows: the working medium filled in the Stirling generator 1 is helium, and the working medium in the compression chamber 22 is also helium. When the system works normally, the phase adjuster 12 drives the compression piston 21 to reciprocate, and a sinusoidal pressure fluctuation is formed in the compression chamber 22. Then, the one-way valve between the outlet 23 of the compression chamber 22 and the helium heat transfer pipeline 3 is used to make a stable high-pressure helium direct current flow in the helium heat transfer pipeline 3, so that the helium enters the heat source to absorb heat. The high-pressure helium after heat transfer exchanges heat with the medium in the high-temperature heat exchanger 143 in the Stirling generator 1, so that a higher temperature difference is formed between the high-temperature heat exchanger 143 and the low-temperature heat exchanger 141. The regenerator 142 converts the heat energy into the sound energy possessed by the compressible fluid in the reciprocating oscillation, so as to drive the phase adjuster 12 to reciprocate. The phase adjuster 12 drives the power piston 15 to reciprocate through the connecting rod 17. The power piston 15 reciprocally cuts the magnetic lines in the linear motor 18 to generate alternating current. The elastic member 19 provides power for the reciprocating movement of the power piston 15. The elastic member 19 can be a column spring or a plate spring. In the embodiment, the plate spring is preferred.

[0062] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A free-piston Stirling power generation system with a built-in compressor, characterized in that, include: Heat source; A Stirling generator (1) includes a housing (11) and a phase adjuster (12), wherein the phase adjuster (12) is disposed inside the housing (11) and is separated from the inner wall of the housing (11) on one axial side by an expansion chamber (13); The air compressor (2) includes an air compressor piston (21) and an air compressor chamber (22). The air compressor chamber (22) is located in the expansion chamber (13). The air compressor piston (21) is movably located in the air compressor chamber (22). The air compressor piston (21) is connected to the phase adjuster (12) so that the air compressor piston (21) can reciprocate along the axial direction of the air compressor chamber (22). The air compressor chamber (22) is filled with the same helium gas as the Stirling generator (1). The air compressor chamber (22) has an outlet (23) and an inlet (24). A helium heat transfer pipeline (3) is provided, with one end connected to the outlet (23) and the other end connected to the inlet (24). The helium heat transfer pipeline (3) passes through the heat source and the Stirling generator (1) in sequence, so that the helium in the helium heat transfer pipeline (3) is supplied to the Stirling generator (1) for heat transfer and power generation after heat transfer with the heat source. The air compressor piston (21) and the air compressor chamber (22) are sealed with a gap to keep the average pressure between the expansion chamber (13) and the air compressor chamber (22) consistent. The ratio of the volume of the compressed air chamber (22) to the scavenging volume of the compressed air piston (21) is 1.5 to 3.

2. The free piston Stirling power generation system with built-in compressor according to claim 1, characterized in that, The outlet (23) is connected to the helium heat transfer pipeline (3) via a first unidirectional conductor (31), the first unidirectional conductor (31) being directed from the outlet (23) to one end of the helium heat transfer pipeline (3).

3. The free piston Stirling power generation system with built-in compressor according to claim 2, characterized in that, The inlet (24) is connected to the helium heat transfer pipeline (3) via a second unidirectional conductor (32), the direction of which is from the other end of the helium heat transfer pipeline (3) toward the inlet (24).

4. The free piston Stirling power generation system with built-in compressor according to claim 3, characterized in that, Both the first unidirectional guide (31) and the second unidirectional guide are one-way valves.

5. The free piston Stirling power generation system with a built-in compressor according to any one of claims 1-4, characterized in that, The heat source is one of nuclear heat, solar heat, industrial waste heat, and fuel combustion heat.

6. The free piston Stirling power generation system with a built-in compressor according to any one of claims 1-4, characterized in that, The Stirling generator (1) also includes: Thermoacoustic unit (14) is disposed between the phase tuner (12) and the radial inner wall of the housing (11). The thermoacoustic unit (14) is used to generate acoustic power. The phase tuner (12) can reciprocate along the thermoacoustic unit (14) under the action of the acoustic power. A power piston (15) is disposed inside the housing (11). The power piston (15) is disposed on the side of the phase adjuster (12) away from the expansion chamber (13). A compression chamber (16) is separated between the power piston (15) and the phase adjuster (12). The power piston (15) is connected to the phase adjuster (12) through a connecting rod (17). A linear motor (18) is disposed between the power piston (15) and the radial inner wall of the housing (11); An elastic element (19) is disposed inside the housing (11) on the opposite side of the expansion cavity (13), and the connecting rod (17) is connected to the elastic element (19).

7. The free piston Stirling power generation system with built-in compressor according to claim 6, characterized in that, The elastic element is a column spring or a leaf spring.

8. The free piston Stirling power generation system with built-in compressor according to claim 6, characterized in that, The thermoacoustic unit (14) includes a low-temperature heat exchanger (141), a regenerator (142), and a high-temperature heat exchanger (143), which are arranged sequentially from the compression chamber (16) toward the expansion chamber (13).

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