A regenerative buffer tube type free piston stirling generator

Abstract

The application provides a regenerative buffer pipe type free piston Stirling generator, which comprises a cylinder body, a piston, an elastic member, a linear motor, a cylinder, a cooler, a regenerative buffer pipe bundle, a heater and a heat accumulator; the cylinder body comprises a first cylinder body and a second cylinder body; the elastic member, the linear motor, the piston, the cylinder and the cooler are installed in the first cylinder body, the elastic member is connected with a mover of the linear motor and one end of the piston respectively, the piston can slide in the cylinder to separate the first cylinder body into a compression chamber and a back pressure chamber, the compression chamber is formed between the other end of the piston and the cooler; the heater and the heat accumulator are installed in the second cylinder body, one end of the heater is connected with the heat accumulator, the other end of the heater is connected with the cooler and the regenerative buffer pipe bundle is arranged between the other end of the heater and the cooler. The application obviously improves the reciprocating motion of the gas between the cold end and the hot end, realizes certain isothermal expansion, isothermal compression and constant volume regenerative processes when the gas moves, and greatly improves the thermoelectric conversion efficiency of the generator.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of Stirling power generation devices, and in particular to a regenerative buffer tube type free piston Stirling engine. BACKGROUND

[0002] Energy and environmental problems have become the main problems restricting the development of countries in the world today. With the continuous development of society, traditional high-grade fossil fuels not only cannot meet the demand of mankind in quantity, but also cause environmental pollution problems that do not meet the new development concept of mankind. On the one hand, the society today is actively exploring new alternative energy sources such as solar energy and nuclear energy, and on the other hand, it is also developing and utilizing existing low-grade energy sources such as waste heat and ordinary fuel. However, only when the energy is successfully converted can it be effectively utilized by mankind. Therefore, one of the effective ways to actively solve the above problems is to develop a power mechanical device that can successfully convert various new alternative energy sources and low-grade energy sources.

[0003] The free piston Stirling engine is a high-efficiency external combustion heat-electricity conversion machine that can utilize almost all existing heat sources. Unlike other types of free piston Stirling engines, the single-piston type free piston Stirling engine has only one moving part, which can reciprocate at room temperature, and the piston is supported by a leaf spring, and the gap sealing technology is used between the piston and the cylinder. Compared with conventional free piston Stirling engines, it has a simpler structure, longer service life and higher reliability. Therefore, the single-piston type free piston Stirling engine has a relatively broad application prospect, and is mainly used for deep-sea long-life low-power detectors, spacecraft instruments and communication, planetary surface data measurement sensors, etc., and can also be used to establish a long-life power supply network composed of small distributed sites.

[0004] The single-piston free-piston Stirling generator in the prior art comprises a sealed cylinder and a piston, the piston separates the cylinder into a working chamber and a back pressure chamber. A linear motor and a plate spring are arranged in the back pressure chamber, the plate spring is connected with a mover of the linear motor and one end of the piston respectively. A cooler, a regenerator and a heater are arranged in the working chamber in sequence, the cooler is arranged close to the other end of the piston, a phase adjusting small hole is arranged in the middle of the cooler, one end of the cooler is connected with the regenerator, the other end of the regenerator is connected with the heater, and gas passages are arranged in the interiors of the cooler and the regenerator. In working, since the whole generator forms a cavity completely closed with the outside through the cylinder, the cavity is filled with high-pressure helium, when the heater of the generator is heated from the outside, the helium is heated and expanded, the pressure in the working chamber is increased, so that the piston is driven to move towards the back pressure chamber, since the piston moves, the volume of the working chamber is increased, part of the gas enters the regenerator from the heater, the temperature of the gas is reduced after the heat is left to the regenerator, and the gas is cooled when moving to the cooler, the pressure in the working chamber is reduced. When the pressure in the working chamber is less than the pressure in the back pressure chamber, the piston moves in the opposite direction, and drives the gas to enter the heater along the gas passages in the cooler and the regenerator in sequence, in this process, the gas absorbs the heat of the regenerator, is heated in the heater, and the pressure is increased. When the pressure in the working chamber is greater than the pressure in the back pressure chamber, the piston moves towards the back pressure chamber again, so as to perform the cyclic movement repeatedly. The coil of the linear motor is cut by the magnetic induction line in the movement of the piston, the linear motor outputs electricity to the outside, and realizes the thermoelectric conversion process of converting the heat energy of the outside into electricity.

[0005] However, it is found in actual use that, since the gas can only flow along the narrow gas passage in the regenerator when the piston moves towards the working chamber, the gas is transported from the cooler to the heater, and must also pass through the regenerator when returning from the heater to the cooler, in this process, the flow of the gas is subjected to great resistance, which affects the thermoelectric conversion efficiency of the Stirling generator. SUMMARY

[0006] The application provides a regenerative buffer pipe type free-piston Stirling generator, which is used to solve the problem of low thermoelectric conversion efficiency of the single-piston free-piston Stirling generator in the prior art due to great resistance of the flow of the gas.

[0007] The application provides a regenerative buffer pipe type free piston Stirling generator, which comprises a cylinder, a piston, an elastic element, a linear motor, a cylinder, a cooler, a regenerative buffer pipe bundle, a heater and a heat accumulator.

[0008] According to the application, the first cylinder and the second cylinder are coaxially arranged, and the open end of the first cylinder is arranged opposite to the open end of the second cylinder.

[0009] According to the application, the cooler and the heater each comprise a copper heat exchanger, and the heat accumulator comprises a filling body filled in the heat accumulation cavity, wherein the filling body is made of metal wire mesh material.

[0010] According to the application, the piston and the bottom end of the first cylinder form the back pressure cavity, the elastic element is a plate spring, the plate spring is arranged close to the bottom end of the first cylinder, the outer edge of the plate spring is connected with the back iron through the elastic element support, and the middle part of the plate spring is connected with a piston rod arranged at one end of the piston.

[0011] According to the application, the linear motor comprises a back iron and a moving support, the stator of the linear motor is arranged on the first cylinder through the back iron, the back iron is provided with an annular opening coaxially arranged with the piston, the opening end of the annular opening faces the bottom end of the first cylinder, one end of the moving support is connected with the middle part of the plate spring, and the other end of the moving support is connected with the mover and extends into the annular opening.

[0012] The regenerative buffer pipe type free piston Stirling generator provided by the application is characterized in that the regenerative buffer pipe type free piston Stirling generator further comprises an elastic element support arranged on the side of the first cylinder body close to the bottom end of the first cylinder body, and the elastic element support is connected with the outer edge of the leaf spring.

[0013] The regenerative buffer pipe type free piston Stirling generator provided by the application is characterized in that the stator of the linear motor is a permanent magnet, and the rotor of the linear motor is an excitation winding.

[0014] The regenerative buffer pipe type free piston Stirling generator provided by the application is characterized in that the gas medium filled in the cylinder body is helium or hydrogen.

[0015] The regenerative buffer pipe type free piston Stirling generator provided by the application is characterized in that the regenerative buffer pipe type free piston Stirling generator is arranged based on the cylinder body, the piston, the elastic element, the linear motor, the cylinder, the cooler, the regenerative buffer pipe bundle, the heater and the heat accumulator, so as to delay the phase of the gas pressure wave and the mass flow in the cylinder body, to make the engine realize the Stirling thermodynamic cycle, to convert heat into work, and to output the work in the form of electric energy through the linear motor. The heater is connected with the heat accumulator alone, and the regenerative buffer pipe bundle is arranged between the heater and the cooler. The regenerative buffer pipe bundle has a certain temperature gradient, can obviously improve the reciprocating motion of the gas between the cold end and the hot end of the generator, and makes the gas realize certain isothermal expansion, isothermal compression and constant volume heat recovery process when moving, so as to greatly improve the thermoelectric conversion efficiency of the generator. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the 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 on the basis of these drawings.

[0017] Figure 1 is a cross-sectional structure schematic view of the regenerative buffer pipe type free piston Stirling generator provided by the application;

[0018] Reference signs:

[0019] 1: cylinder body; 2: piston; 3: elastic element;

[0020] 4: linear motor; 5: cooler; 6: heater;

[0021] 7: heat accumulator; 8: annular opening; 41: stator;

[0022] 42: rotor; 43: regenerative iron; 44: moving support;

[0023] 10: Compression chamber; 11: Back pressure chamber; 12: Heat storage chamber;

[0024] 9: Heat recovery buffer tube bundle; 31: Elastic part support; 13: Cylinder. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0026] The following combination Figure 1 The present invention describes a regenerative buffer tube type free piston Stirling generator.

[0027] The present embodiment provides a regenerative buffer tube type free piston Stirling generator (hereinafter referred to as generator), which includes: a cylinder body 1, a piston 2, an elastic member 3, a linear motor 4, a cylinder 13, a cooler 5, a heater 6, a heat accumulator 7 and a regenerative buffer tube bundle 9; the cylinder body includes a first cylinder body and a second cylinder body; the elastic member 3, the linear motor 4, the piston 2, the cylinder 13 and the cooler 5 are installed in the first cylinder body, the elastic member 3 is respectively connected to the mover of the linear motor 4 and one end of the piston 2, and the piston 2 can slide in the cylinder 13 to move the first cylinder body. The cylinder body is divided into a compression chamber 10 and a back pressure chamber 11. The compression chamber 10 is formed between the other end of the piston 2 and the cooler 5, and the back pressure chamber 11 is formed between the end of the first cylinder body away from the cooler 5 and one end of the piston 2; the heater 6 and the heat accumulator 7 are installed in the second cylinder body, one end of the heater 6 is connected to the heat accumulator 7, and the other end of the heater 6 is connected to the cooler 5 through the heat recovery buffer tube bundle 9, so as to realize the communication between the compression chamber 10 and the internal cavity of the second cylinder body through the heat recovery buffer tube bundle 9, and constitute the working chamber of the generator.

[0028] The heat recovery buffer tube bundle 9 shown in this embodiment can be either a single heat recovery buffer tube or multiple heat recovery buffer tubes designed according to actual needs.

[0029] like Figure 1 As shown, the piston 2 shown in this embodiment can make reciprocating motion in the cylinder 13, and the position where the piston 2 moves to the rightmost end is set as the right dead center, and the position where the piston 2 moves to the leftmost end is set as the left dead center, wherein the left dead center and the right dead center are specifically the left and right extreme positions of the right end of the piston 2 when the piston 2 makes reciprocating motion in the cylinder 13. Obviously, the right dead center is close to the position where the cooler 5 is located.

[0030] When the piston 2 is at the right end, the pressure inside the working chamber is higher than the pressure of the back pressure chamber, the gas in the working chamber expands, the pressure of the gas in the working chamber and the elastic force of the elastic member 3 jointly act on the piston 2 to overcome the damping force, and push the piston 2 to move to the side of the back pressure chamber 11, i.e. the piston 2 moves to the left as shown. Figure 1 Due to the heating of the gas by the heater 6, the gas continuously absorbs external heat to realize the isothermal expansion process, and the pressure of the gas decreases. Due to the movement of the piston 2, the volume of the working chamber increases, and a part of the gas flows through the regenerative buffer tube bundle 9, moves to the cooler 5 after heat release, and then enters the compression chamber 10. The gas entering the compression chamber 10 is more to push the movement of the piston 2, so that the pressure of the working chamber continues to decrease until the pressure of the working chamber is equal to the pressure of the back pressure chamber 11. At this time, the piston 2 continues to move to the left due to inertia, overcomes the elastic force and the damping force, and the pressure of the working chamber continues to decrease until the piston 2 moves to the left end. In the time from the piston 2 approaching the left dead point to completing the reversing and then leaving the left dead point, the volume change caused by the movement of the piston 2 is approximately zero, but at this time the gas in the regenerative buffer tube bundle 9 still flows to the left under the action of inertia, realizes the isochoric heat release, and then enters the cooler 5.

[0031] When the piston 2 moves to the left end, the pressure of the gas in the back pressure chamber 11 is higher than the pressure of the gas in the working chamber, the pressure of the gas in the back pressure chamber 11 and the elastic force of the elastic member 3 jointly act on the piston 2 to overcome the damping force, and push the piston 2 to move to the right, the low-pressure gas is compressed in the compression chamber 10, the pressure of the gas in the working chamber gradually increases, and the pressure of the gas in the working chamber is equal to the pressure of the gas in the back pressure chamber 11. At this time, the piston 2 continues to move to the right due to inertia, overcomes the elastic force and the damping force, and the pressure of the working chamber continues to increase until the piston 2 moves to the right end. The compression heat generated in the compression process is taken away by the cooler 5 to realize the isothermal compression process. In the time from the piston 2 approaching the right dead point to reversing and then leaving the right dead point, the volume change caused by the movement of the piston 2 is approximately zero, but at this time the gas in the regenerative buffer tube bundle 9 still flows to the right under the action of inertia, realizes the isochoric heat absorption process, and then enters the heater 6 and the regenerator 7, and the pressure continues to increase. At this time, the generator completes a thermodynamic cycle, and then performs a second thermodynamic cycle, and so on.

[0032] Unlike the dual-piston Stirling engine, the generator shown in the embodiment does not have a porting piston for providing phase delay between pressure fluctuation and mass flow, but the gas dynamics and heat transfer conditions in the regenerator 7 and the regenerative buffer tube bundle 9 shown in the embodiment can produce a certain phase delay, realizing the processes of isothermal expansion, isothermal compression and isochoric regenerative heat exchange. Here, the regenerative buffer tube bundle 9 shown in the embodiment is equivalent to a regenerator, absorbing heat from the gas at the end of expansion and releasing heat to the gas at the end of compression. The processes before and after the reversal of the piston 2 at the left and right dead centers are approximately considered as isochoric processes, and the gas will continue to move left or right under the action of inertia (phase difference) for a short time after the reversal of the piston 2, thus completing the isochoric heat release or absorption process in the regenerative buffer tube bundle 9. In the process of compressing part of the gas to the hot end, the regenerator 7 shown in the embodiment absorbs heat from the working gas, and the heat capacity of the regenerator 7 is high enough not to have obvious temperature fluctuations. When the gas expands, the regenerator 7 sends the heat stored in the compression stage back to the gas, realizing sufficient heat exchange at the hot end. Since the piston 2 shown in the embodiment is connected with the mover 42 of the linear motor 4, the mover 42 of the linear motor 4 will move reciprocatingly with the piston 2, and through the reciprocating movement, the stator 41 and the mover 42 of the linear motor 4 will relatively move along the axial direction of the cylinder 1 and cut the magnetic induction lines to output electric energy. The whole process experiences the conversion of thermal energy-mechanical energy-electric energy, i.e., the generator continuously converts the external thermal energy into electric energy.

[0033] Based on the above description, the thermodynamic cycle of the generator shown in the embodiment mainly includes the following four stages:

[0034] Stage 1: Since the gas pressure in the back pressure chamber 11 is higher than the gas pressure in the working chamber of the engine, the gas pressure in the back pressure chamber 11 and the elastic force of the elastic member 3 jointly act to overcome the damping force on the piston 2, and push the piston 2 to move to the right dead center direction, and the working gas is isothermally compressed in the compression chamber 10, and the compression heat is taken away by the cooler 5. When the pressure of the gas in the back pressure chamber 11 is equal to the pressure of the gas in the working chamber, the piston 2 still moves to the right dead center direction under the action of inertia, overcoming the elastic force of the elastic member 3 and the damping force, and continues to complete the isothermal compression process until it reaches the right dead center.

[0035] Stage 2: In the period before and after the reversal of the piston 2 at the right dead center, the volume of the working chamber is approximately constant, but the gas in the regenerative buffer tube bundle 9 still flows from the cooler 5 to the heater 6, and after completing the constant-volume heat absorption, enters the heater 6 and the regenerator 7, and the gas pressure continues to rise.

[0036] Stage 3: When the gas pressure in the working chamber of the engine is higher than the gas pressure in the back pressure chamber 11, the gas pressure in the working chamber and the elastic force of the elastic member 3 jointly act to overcome the damping force on the piston 2, and push the piston 2 to move towards the left dead point, and the working gas is isothermally expanded in the heat storage chamber 12, and at the same time absorbs heat in the heater 6. When the pressure of the gas in the working chamber is the same as the pressure of the gas in the back pressure chamber 11, the piston 2 continues to move towards the left dead point under the action of inertia, overcomes the elastic force of the elastic member 3 and the damping force, and completes the isothermal expansion process, and until it reaches the left dead point, the gas pressure is reduced.

[0037] Stage 4: During the time when the piston 2 reaches the left dead point and before and after the reversing movement, the volume of the working chamber is approximately constant, but the gas in the regenerative buffer tube bundle 9 still flows from the heater 6 to the cooler 5, and after completing the constant-volume heat release, enters the cooler 5 and the compression chamber 10, and the gas pressure continues to decrease.

[0038] The four stages form a cycle, and the heat input from the heater 6 is converted into work, which is converted into electrical energy output by the linear motor 4, and the excess heat is taken away by the cooler 5. The heater 6 is connected to the heat accumulator 7 alone, and the regenerative buffer tube bundle 9 is arranged between the heater 6 and the cooler 5, the regenerative buffer tube bundle 9 has a certain temperature gradient, and significantly improves the reciprocating motion of the gas between the cold and hot ends of the generator, so that the gas motion realizes a certain isothermal expansion, isothermal compression and constant-volume heat recovery process, greatly improving the thermoelectric conversion efficiency of the generator.

[0039] It should be pointed out that the gas medium filled in the cylinder body 1 shown in the embodiment is preferably helium gas at a certain pressure. Obviously, the gas medium is distributed in the back pressure chamber 11 and the working chamber shown in the above embodiment.

[0040] At the same time, the cylinder body 1 shown in the embodiment can be designed as a U-shaped type or a linear type. As shown in the embodiment, the cylinder body 1 is designed as a linear type, and the cylinder body 1 comprises a first cylinder body and a second cylinder body. Figure 1 The open end of the first cylinder body is arranged opposite to the open end of the second cylinder body; the cooler 5 is installed at the open end of the first cylinder body; and the heater 6 is installed at the open end of the second cylinder body to form the heat storage chamber 12 for installing the heat accumulator 7 in the second cylinder body.

[0041] Among them, the first cylinder body and the second cylinder body shown in the embodiment are both arranged as single-end open, that is, one end of the first cylinder body is an open end, and the other end of the first cylinder body away from the open end is a bottom end; correspondingly, one end of the second cylinder body is an open end, and the other end of the second cylinder body away from the open end is a bottom end.

[0042] Specifically, in order to ensure that the gas in the working chamber effectively exchanges heat with the cooler 5 and the heater 6 respectively, so as to increase the gas-solid heat exchange area and immediately take away or absorb heat, the cooler 5 and heater 6 shown in this embodiment both use copper heat exchangers, and the copper heat exchanger is provided with a plurality of gas channels or air gaps for gas to pass through, so that the gas can exchange heat with the copper heat exchanger.

[0043] In order to allow the gas to absorb sufficient heat at the hot end, the heat accumulator 7 shown in this embodiment can be configured as a filling body filled in the heat storage cavity 12, and the filling body is made of a metal mesh material.

[0044] Further, if Figure 1 As shown, a back pressure chamber 11 is formed between the piston 2 and the second end of the cylinder body 1 shown in this embodiment, and the elastic member 3 is installed at the second end of the cylinder body 1. In order to save layout space and ensure that the elastic member 3 can stably control the reciprocating motion of the piston 2 in the cylinder 13, the elastic member 3 shown in this embodiment is preferably a leaf spring, which is arranged near the bottom end of the first cylinder body. The leaf spring can be specifically designed to have a spiral arm shape with evenly distributed vortex grooves. The outer edge of the leaf spring is connected to the return iron 43 through the elastic member support 31, and the middle part of the leaf spring is connected to the piston rod provided at one end of the piston 2.

[0045] Furthermore, the linear motor 4 shown in this embodiment includes a return iron 43, a stator 41, a movable bracket 44, and a mover 42; the stator 41 of the linear motor 4 is installed on the first cylinder body through the return iron 43, wherein the return iron 43 is installed between the inner wall surface of the first cylinder body and the outer surface surface of the cylinder 13; the return iron 43 is constructed with an annular opening 8 coaxially arranged with the piston 2, and the open end of the annular opening 8 faces the bottom end of the first cylinder body, one end of the movable bracket 44 is connected to the middle part of the leaf spring, and the other end of the movable bracket 44 is connected to the mover 42 and extends into the annular opening 8.

[0046] It should be noted that to ensure the compactness of the generator structure, this embodiment specifically provides an annular opening 8 coaxially disposed outside the cylinder 13 where the piston 2 resides. Furthermore, this embodiment also includes an elastic member support 31 on the side of the return iron 43 facing the bottom end of the first cylinder body. The elastic member support 31 is connected to the outer edge of the leaf spring.

[0047] Meanwhile, the stator 41 of the linear motor 4 shown in this embodiment is a permanent magnet, and the mover 42 of the linear motor 4 is an excitation winding, which is mounted on a movable bracket 44. Thus, as the excitation winding reciprocates with the movable bracket 44, it correspondingly cuts the magnetic flux lines of the magnetic field generated by the permanent magnet, thereby converting kinetic energy into electrical energy for external output.

[0048] In the embodiment, the excitation winding is fixedly installed on the cylinder body 1, and the permanent magnet is installed on the reciprocating movable moving support 44 shown in the above embodiment, so that kinetic energy is converted into electric energy based on the relative movement between the excitation winding and the permanent magnet, and the electric energy is output. The scheme shown in the embodiment can be achieved, and is not limited here.

[0049] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but 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 regenerative buffer tube free piston Stirling generator, characterized in that: include: Cylinder body, piston, elastic part, linear motor, cylinder, cooler, heat recovery buffer tube bundle, heater and heat accumulator; The cylinder body includes a first cylinder body and a second cylinder body which are coaxially and separately arranged; The elastic member, the linear motor, the piston, the cylinder, and the cooler are installed in the first cylinder body. The elastic member is connected to the mover of the linear motor and one end of the piston, respectively. The piston is slidable in the cylinder to separate the first cylinder body into a compression chamber and a back pressure chamber. The compression chamber is formed between the other end of the piston and the cooler. The heater and the heat accumulator are installed in the second cylinder body, one end of the heater is connected to the heat accumulator, and the other end of the heater is connected to the heat recovery buffer tube bundle between the cooler, so that the gas in the heat recovery buffer tube bundle has a temperature gradient when the gas moves.

2. The regenerative buffer tube free piston Stirling generator according to claim 1, characterized in that: The open end of the first cylinder body is arranged opposite to the open end of the second cylinder body; the cooler is installed at the open end of the first cylinder body; the heater is installed at the open end of the second cylinder body to form a heat storage chamber in the second cylinder body for installing the heat accumulator.

3. The regenerative buffer tube free piston Stirling generator according to claim 2, characterized in that: The cooler and the heater both include copper heat exchangers, and the heat accumulator includes a filling body filled in the heat storage cavity, and the filling body is made of a metal wire mesh material.

4. The regenerative buffer tube free piston Stirling generator according to claim 2, characterized in that: The back pressure chamber is formed between the piston and the bottom end of the first cylinder body. The elastic member is a leaf spring, which is arranged close to the bottom end of the first cylinder body. The middle part of the leaf spring is connected to the piston rod arranged at one end of the piston.

5. The regenerative buffer tube free piston Stirling generator according to claim 4, characterized in that: The linear motor includes a return iron and a movable bracket; The stator of the linear motor is mounted on the first cylinder through the return iron; The return iron is provided with an annular opening coaxially arranged with the piston, the opening end of the annular opening faces the bottom end of the first cylinder body, one end of the movable bracket is connected to the middle part of the leaf spring, and the other end of the movable bracket is connected to the mover and extends into the annular opening.

6. The regenerative buffer tube free piston Stirling generator according to claim 5, characterized in that: An elastic member support is further installed on one side of the return iron facing the bottom end of the first cylinder body, and the elastic member support is connected to the outer edge of the leaf spring.

7. The regenerative buffer tube free piston Stirling generator according to claim 1, characterized in that: The stator of the linear motor is a permanent magnet, and the mover of the linear motor is an excitation winding.

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