TWI499718B - Free-piston stirling engine - Google Patents

Description

Free piston Stirling engine

The invention relates to a free piston Stirling engine, in particular to a function of releasing kinetic energy, which can synchronously start the gas mover and the power piston, and reduce the overall volume without lateral stress and lateral direction. Vibration, and the working fluid will not leak out, to achieve the complete airtight Sterling engine construction.

Because the global environment warming and pollution problems are endless, it is an important goal to seek renewable energy to generate power output. The Stirling engine is different from the internal combustion engine, which requires fuel to enter the engine to explode and burn. Noise, but belongs to the external combustion engine, the internal working fluid has no mass exchange with the outside world, and through the external heat source, the working fluid in the closed system has the behavior of heat expansion and contraction to drive the power piston and then work externally, so Stirling The engine is a high-efficiency external combustion engine that uses hot end heating to convert into mechanical energy.

The structure of the Sterling engine, which is generally common, is mainly shown in the ninth figure. It mainly has an engine cavity (A), and the inside of the engine cavity (A) is divided into an expansion chamber (A1) and a compression chamber. (A2) for accumulating a working fluid, and one end of the expansion chamber (A1) is located outside the engine cavity (A) as a heating end (A3), and the heating end (A3) is compatible with a heater a connection (not shown) for heating the heating end (A3), and the other end of the expansion chamber (A1) is located outside the engine cavity (A) as a cooling end (A4), the cooling The end (A4) is connectable to a cooler (not shown) for cooling the cooling end (A4); and a gas mover (B) is provided in the expansion chamber (A1) and the compression chamber ( A2) moves back and forth, and another power piston (C) is reciprocated in the compression chamber (A2), and the air mover (B) is provided with a central shaft (B1) through the power a shaft hole (C1) of the piston (C), wherein the central shaft (B1) is connected with a first round spring (B2), and the power piston (C) is connected with a second round spring (C2), The other ends of the first round spring (B2) and the second round spring (C2) are fixed to the inner wall of the other end of the compression chamber (A2), and the diameter of the air mover (B) is Slightly smaller than the diameter of the expansion chamber (A1), a regeneration passage (B3) is separated from the gap between the air mover (B) and the inner wall of the expansion chamber (A1), and the regeneration passage (B3) can be connected. The expansion chamber (A1) and the compression chamber (A2). When the Stirling engine is actuated, the heating end (A3) is heated by a heater to raise the temperature, and the working fluid in the expansion chamber (A1) starts to expand after being heated, and the pressure becomes large, which pushes the The air mover (B) moves toward the compression chamber (A2), and the central shaft (B1) presses against the first round spring (B2), and also gradually pushes the power piston (C) to move, and presses the a second round wire spring (C2); when the cooler is started, cooling the working fluid in the cooling end (A4), causing the working fluid in the compression chamber (A2) and the expansion chamber (A1) to contract, and the pressure It will become smaller, so that the air mover (B) and the power piston (C) cooperate with the elastic recovery force of the first round spring (B2) and the second round spring (C2), and return to the original In this way, the interaction between heating and cooling is utilized, and the reciprocating cycle outputs power for operation.

However, in this configuration, since the air mover (B) and the power piston (C) are not directly coupled, they are respectively connected to the first round spring (B2) and the second round spring. (C2), therefore, there is a disadvantage that the time difference between starting and then starting separately when the movement starts, and the first round spring (B2) and the second round spring (C2) have a certain length, so The length of the engine cavity (A) is lengthened, so that the overall volume becomes large, and the strokes of the first round spring (B2) and the second round spring (C2) are large, and it is easy to move. The lateral stress and the lateral vibration are generated so as to affect the actuation, and the working fluid in the compression chamber (A2) is also easily leaked out from the gap between the central shaft (B1) and the shaft hole (C1). The air tightness is not good.

There is also a new patent No. M336994, "The Thermal Power Unit Combined with Stirling Engine", which was announced on July 21, 1997. It is revealed that it contains a Stirling engine and a cylinder; the Stirling engine The utility model comprises a linkage assembly and a pneumatic cylinder, the linkage assembly comprises a reciprocating component, and the gas The pressure cylinder has a cylinder, a piston accommodated in the cylinder, and a connecting rod connecting the piston and the reciprocating member, the cylinder having a cooling end and a heat formed on the other side of the cooling end The cylinder includes a bottom plate and a cover body coupled to the bottom plate, and a cavity is formed between the bottom plate and the cover body, and an air inlet and an air outlet of the chamber are connected to the chamber. The pneumatic cylinder and the reciprocating component are accommodated, and the heated end is connected to the bottom plate; thereby, the heat dissipation effect of the cooling end is increased, thereby improving the output performance of the thermodynamic device.

However, in the above-mentioned patent, the connection between the piston and the reciprocating member is combined by a connecting rod to achieve the function of synchronously interlocking the piston with the reciprocating member, however, since it assists the reciprocating member The lower moving elastic element is still a round wire spring structure, so there is still a long length, resulting in a larger cylinder volume, and a larger stroke, which tends to generate lateral stress and lateral vibration during movement, and affects actuation, etc. The shortcomings exist, so it is still not ideal in use.

Therefore, in view of the above-mentioned shortcomings of the free piston Stirling engine, the present invention provides a free piston Stirling engine, which is provided with an engine cavity, and one of the internal connections is provided. a compression chamber and an expansion chamber, a regeneration passage is disposed between the compression chamber and the expansion chamber, and a heating end and a cooling end are respectively disposed at two ends of the expansion chamber; and a power piston is disposed in the engine cavity In the compression chamber, the power piston is provided with a connecting rod, one end of the connecting rod is coupled with at least one first planar spring, the first planar spring is fixed in the engine cavity; and a gas transmitter is hollowed out And is disposed in the expansion chamber of the engine cavity; an energy storage unit is connected between the power piston and the air mover, and the energy storage unit is provided with a central shaft, and one end of the central shaft is connected On the power piston.

The engine cavity system is composed of a heating head, a cylinder and a base. The expansion chamber is disposed in the heating head, and the compression chamber is disposed in the cylinder, and the periphery of the cylinder is provided with a plurality of a heat sink fin is disposed around the outer edge of the cylinder, and an engine water jacket is disposed on the outer edge of the cylinder. The water jacket of the engine is respectively provided with a water inlet hole and a water outlet hole, and a first fixing seat is disposed between one end of the base and the cylinder. The other end of the base is provided with a second fixing seat.

The first planar spring is fixed to the first fixing seat and/or the second fixing seat of the engine cavity by using a plurality of first screwing elements, and the first planar spring is provided with a plurality of first fixing holes, The first fixing hole is provided for the first screwing element to pass through.

The first planar spring is arranged in a circular shape, and a first coupling hole is connected to the connecting rod at a center position thereof, and a plurality of spirals are firstly arranged around the first coupling hole. Groove.

The other end of the central shaft is coupled to a second planar spring that is fixed to the interior of the air mover.

The inside of the air mover is provided with a third fixing base, and the second planar spring is fixed to the third fixing seat by using a plurality of second screwing elements, and the second planar spring is provided with a plurality of The second fixing hole is provided for the second screwing element to pass through.

The second planar spring is arranged in a circular shape, and a second coupling hole is connected to the central shaft at a center position thereof, and a plurality of spirals are arranged around the second coupling hole. Groove.

The other end of the central shaft is coupled to a gas spring that is telescopically movable within the gas spring.

The other end of the central shaft is connected to a magnetic spring. The central shaft is provided with a first polarity and a second polarity. The internal portions of the magnetic spring are respectively opposite to the first polarity. a third polarity of the same polarity, and a fourth polarity opposite to the second polarity and having the same polarity, the first polarity and the third polarity being an N pole, and the second polarity and the fourth polarity It is an S pole.

The diameter of the air mover is smaller than the diameter of the expansion chamber, so that the gap between the air mover and the inner wall of the expansion chamber is separated from the regeneration passage, or the regeneration passage is connected to the expansion chamber by an external flow passage. The compression chamber.

The invention has the following advantages:

1. The present invention utilizes the first planar spring and the energy storage unit to have the function of releasing kinetic energy to synchronize the starter and the power piston and provide the kinetic energy required for its movement.

2. The first planar spring and the second planar spring of the present invention are arranged in a circular shape, so that no excessive space is occupied in the engine cavity, and the overall volume of the Stirling engine can be made. Zoom out.

3. The present invention utilizes the first planar spring and the second planar spring to release kinetic energy, so that the first planar spring and the energy storage unit do not generate lateral stress and lateral vibration when moving, and do not affect the actuation.

4. According to the present invention, since the power piston and the air mover are directly connected by the energy storage unit, there is no problem of energy loss due to the friction between the central shaft of the air mover and the power piston, and the gas mover The central shaft does not extend through the power piston, so the working fluid in the compression chamber does not leak out from the position of the power piston, and complete airtightness can be achieved.

(1)‧‧‧Engine cavity

(11) ‧‧‧Compression chamber

(12)‧‧‧Expansion room

(13) ‧‧‧heating end

(14) ‧‧‧cooling end

(15) ‧ ‧ heating head

(16) ‧‧ ‧ cylinder

(161)‧‧‧Heat fins

(17)‧‧‧Base

(171)‧‧‧First mount

(172)‧‧‧Second mount

(18)‧‧‧Engine water jacket

(181)‧‧‧Water inlet

(182)‧‧‧Water outlet

(2) ‧‧‧Power Piston

(21)‧‧‧ Connecting rod

(22)‧‧‧First planar spring

(221)‧‧‧First junction hole

(222)‧‧‧First trench

(223)‧‧‧First fixed hole

(224)‧‧‧First screwing element

(3) ‧‧‧Diver

(31) ‧‧‧Regeneration channels

(32) ‧‧‧ third mount

(4) ‧‧‧ energy storage unit

(41)‧‧‧Central axis

(42)‧‧‧Second plane spring

(421)‧‧‧Second junction hole

(422)‧‧‧Second trench

(423)‧‧‧Second fixing hole

(424)‧‧‧Second screw components

(1A)‧‧‧Engine cavity

(11A) ‧ ‧ compression room

(12A)‧‧‧Expansion room

(13A) ‧‧‧Heating end

(14A) ‧‧‧cooling end

(2A)‧‧‧Power Piston

(21A)‧‧‧ Connecting rod

(22A)‧‧‧First planar spring

(3A)‧‧‧Vehicles

(4A) ‧ ‧ energy storage unit

(41A)‧‧‧Central axis

(42A) ‧‧‧ gas spring

(1B)‧‧‧Engine cavity

(11B) ‧ ‧ compression room

(12B)‧‧‧Expansion room

(13B) ‧‧‧heating end

(14B) ‧‧‧cooling end

(2B)‧‧‧Power Piston

(21B)‧‧‧ Connecting rod

(22B)‧‧‧First Plane Spring

(3B)‧‧‧Vehicles

(31B) ‧‧‧Regeneration channels

(4B) ‧ ‧ energy storage unit

(41B)‧‧‧Central axis

(42B)‧‧‧Magnetic spring

(411B)‧‧‧First polarity

(412B)‧‧‧Second polarity

(421B)‧‧‧ Third polarity

(422B) ‧ ‧ fourth polarity

(1C)‧‧‧Engine cavity

(11C) ‧ ‧ compression room

(12C)‧‧‧Expansion room

(31A) ‧‧‧Regeneration channels

(A) ‧‧‧ engine cavity

(A1)‧‧‧Expansion room

(A2) ‧ ‧ compression room

(A3) ‧ ‧ heating end

(A4) ‧‧‧cooling end

(B) ‧‧‧Vehicles

(B1)‧‧‧Central axis

(B2)‧‧‧First round spring

(B3)‧‧‧Regeneration channel

(C) ‧‧‧Power Piston

(C1)‧‧‧ shaft hole

(C2)‧‧‧Second round spring

[First Figure] is an exploded perspective view of a first embodiment of the present invention.

[Second figure] is a sectional view of a combination of the first embodiment of the present invention.

[Third view] is a sectional view of a first planar spring according to a first embodiment of the present invention.

[Fourth figure] is a sectional view of a second planar spring according to a first embodiment of the present invention.

[Fifth Figure] is a schematic view of the actuation of the first embodiment of the present invention.

[Sixth Diagram] is a simplified schematic diagram of a second embodiment of the present invention.

[Seventh Figure] is a simplified schematic view of a third embodiment of the present invention.

[Eighth image] is a simple schematic diagram of the configuration of the fourth embodiment of the present invention.

[Ninth] is a simple schematic diagram of the structure of the conventional Stirling engine.

Referring to the first and second figures, the first embodiment of the present invention includes an engine cavity (1), a power piston (2), a gas mover (3), and an energy storage unit (4), wherein:

The engine cavity (1) is internally provided with a compression chamber (11) and an expansion chamber (12) connected to each other, and accumulates a working fluid, which may be a gas or a liquid, and the expansion chamber ( 12) The two ends are respectively provided with a heating end (13) and a cooling end (14), wherein the engine cavity (1) is formed by a combination of a heating head (15), a cylinder (16) and a base (17). The expansion chamber (12) is disposed in the heating head (15), and the compression chamber (11) is disposed in the cylinder (16), and the periphery of the cylinder (16) is provided with a plurality of fins (161) And an engine water jacket (18) is disposed around the outer edge of the cylinder (16), and the water jacket (18) is respectively provided with a water inlet hole (181) and a water outlet hole (182), and the base ( A first fixing seat (171) is disposed at one end of the 17) and the gap of the cylinder (16), and a second fixing seat (172) is disposed at the other end of the base (17).

a power piston (2) disposed in a compression chamber (11) of a cylinder (16) of the engine cavity (1) for reciprocating motion in the compression chamber (11), the power piston (2) A connecting rod (21) is provided, and one end of the connecting rod (21) is combined with at least one first planar spring (22) (as shown in the third figure), and the first embodiment is provided with two first planar springs (22). The first planar spring (22) is fixed in the first fixing seat (171) and the second fixing seat (172) of the engine cavity (1) by using a plurality of first screwing elements (224), The first planar spring (22) is formed in a circular sheet shape, and a first coupling hole (221) and the connecting rod (21) are disposed at a center position thereof. Connecting, the first bonding hole (221) is provided with a plurality of spiral first grooves (222) and a plurality of first fixing holes (223), wherein the first fixing holes (223) are for the first A threaded component (224) is threaded.

The air mover (3) is configured to be hollow and disposed in the expansion chamber (12) of the engine cavity (1) for the expansion chamber (12) and the compression chamber (11) Between the back and forth movement, the diameter of the gas remover (3) is slightly smaller than the diameter of the expansion chamber (11), so that a gap between the gas mover (3) and the inner wall of the expansion chamber (12) is separated by a regeneration passage. (31) Further, a third fixing seat (32) is disposed inside the air mover (3).

An energy storage unit (4) is connected between the power piston (2) and the gas mover (3), and the energy storage unit (4) is provided with a central shaft (41), the central shaft (41) One end is connected to the power piston (2), and the other end is connected to a second planar spring (42) (as shown in the fourth figure), and the second planar spring (42) utilizes the second screwing element (424) a third fixing seat (32) fixed to the inside of the air mover (3), the second planar spring (42) is arranged in a circular shape, and is provided at a center position thereof. The second coupling hole (421) is connected to the central shaft (41), and the second coupling hole (421) is provided with a plurality of spiral second grooves (422) and a plurality of second fixing holes (423). The second fixing hole (423) is for the second screwing member (424) to pass through.

In use, as shown in the first, second and fifth figures, the heating end (13) of the engine cavity (1) is heated to raise the temperature, and the cooling end (14) is cooled. When the pressure is reduced, the working fluid in the expansion chamber (12) starts to expand after being heated, and the pressure becomes large. At this time, the first stage is an isothermal expansion process, and the heating end (13) is heated. The gas mover (3) moves to the bottom dead center. At this time, the power piston (2) expands due to the heating of the working fluid, causing the internal pressure of the engine cavity (1) to decrease, and the temperature of the working fluid remains unchanged, which will push the shift. The gas device (3) moves toward the compression chamber (11), thereby pushing the power piston (2) to move in the compression chamber (11), and the central shaft (41) is also the first for the energy storage unit (4) The two planar springs (42) generate a pulling force to pull or press the second planar spring (42), and deform the second planar spring (42) to accumulate a kinetic energy, and the dynamic piston (2) The connecting rod (21) also generates a pressure or thrust for the first planar spring (22) to press or pull the first planar spring (22) and make the first flat The surface spring (22) deforms to accumulate a kinetic energy; the second stage is an isovolumic regeneration exothermic process that causes the mover (3) to move to the top dead center, causing the working fluid to be pushed back to the compression chamber (11). The power piston (2) is located at the bottom dead center, and the volume of the overall working fluid remains unchanged. The working fluid passes through the regeneration passage (31) and heats up first, and the gas mover (3) returns to the top dead center. The power piston (2) returns to the bottom dead center; the third stage is the isothermal compression process, the gas mover (3) is at the top dead center, and the power piston (2) moves to the upper dead center, thereby compressing the working fluid, resulting in The internal pressure of the engine cavity (1) is increased, so that the working fluid moves to the cooling end (14) to release heat, while the working fluid temperature remains unchanged, while the second planar spring (41) releases its accumulated kinetic energy. The central shaft (41) synchronously pulls the power piston (2) back to the top dead center, and the first planar spring (22) simultaneously releases its accumulated kinetic energy to help the power piston (2) move; the fourth stage The isovolumic regenerative endothermic process, which drives the mover (3) to gradually move to the bottom dead center. The working fluid is pushed to the expansion chamber (12), and the power piston (2) is at the top dead center, so that the volume of the overall working fluid does not change, and the working fluid can pass from the regeneration channel when passing through the regeneration passage (31) ( 31) preheating in the middle, such four processes complete a Stirling cycle; therefore, the heating end (13) is used to heat the heating and the cooling end (14) cools and cools the interaction, and the power piston (2) can output power. For use, together with the release kinetic energy of the first planar spring (22) and the second planar spring (42), the gas mover (3) and the power piston (2) can be synchronously started, and the first plane The spring (22) and the second planar spring (42) are arranged in a circular shape, so that the engine cavity (1) is not occupied by an excessive space, and the engine cavity (1) can be The overall volume is reduced, and the first planar spring (22) and the second planar spring (42) do not generate lateral stress and lateral vibration when moving, thereby affecting the actuation, and the compression chamber (11) The working fluid inside will not leak out from the position of the power piston (2) to achieve complete Tightness.

According to a second embodiment of the present invention, as shown in the sixth figure, the engine cavity (1A) is internally provided with a compression chamber (11A) and an expansion chamber (12A), and the expansion chamber (12A) The ends are respectively provided with a heating end (13A) and a cooling end (14A).

a power piston (2A) is disposed in the compression chamber (11A) of the engine cavity (1A), and the power piston (2A) is provided with a connecting rod (21A), and one end of the connecting rod (21A) is coupled A first planar spring (22A) is secured within the compression chamber (11A).

The air mover (3A) is configured to be hollow and disposed in the expansion chamber (12A) of the engine cavity (1A), and the diameter of the air mover (3A) is slightly smaller than the expansion chamber (11A) The diameter of the gap between the gas trap (3A) and the inner wall of the expansion chamber (12A) is separated from a regeneration passage (31A).

An energy storage unit (4A) is connected between the power piston (2A) and the gas mover (3A), and the energy storage unit (4A) is provided with a central shaft (41A), the central shaft (41A) One end is connected to the power piston (2A), and the other end is connected to a gas spring (42A), and the center shaft (41A) is telescopically movable in the gas spring (42A) to accumulate kinetic energy.

In use, as shown in the sixth figure, the first planar spring (22A) and the gas spring (42A) of the energy storage unit (4A) are used to make the gas mover (3A) and the power piston (2A) Synchronous start, and provide the kinetic energy required for its movement, and it does not occupy too much space in the engine cavity (1A), so that the overall volume of the engine cavity (1A) can be reduced, especially The first planar spring (22A) and the gas spring (42A) also do not generate lateral stress and lateral vibration when moving, so as not to affect the actuation, and the working fluid in the compression chamber (11A) is not The position of the power piston (2A) leaks out to achieve complete airtightness.

According to a third embodiment of the present invention, as shown in the seventh figure, the engine cavity (1B) is internally provided with a compression chamber (11B) and an expansion chamber (12B), and the expansion chamber (12B) The ends are respectively provided with a heating end (13B) and a cooling end (14B).

a power piston (2B) is disposed in the compression chamber (11B) of the engine cavity (1B), and the power piston (2B) is provided with a connecting rod (21B), and one end of the connecting rod (21B) is coupled A first planar spring (22B) is secured within the compression chamber (11B).

The air mover (3B) is configured to be hollow and disposed in the expansion chamber (12B) of the engine cavity (1B), and the diameter of the air mover (3B) is slightly smaller than the expansion chamber (11B) The diameter of the gap between the gas trap (3B) and the inner wall of the expansion chamber (12B) is separated from a regeneration passage (31B).

An energy storage unit (4B) is connected between the power piston (2B) and the gas mover (3B), and the energy storage unit (4B) is provided with a central shaft (41B), the central shaft (41B) One end is connected to the power piston (2B), and the other end is connected to a magnetic spring (42B). The central shaft (41B) is provided with a reverse first polarity (411B) and a second polarity. (412B), wherein the first polarity (411B) can be an N pole, and the second polarity (412B) can be an S pole, and the two ends of the magnetic spring (42B) are respectively provided with an The first polarity (411B) is opposite and the third polarity of the same polarity (421B), and a fourth polarity (422B) opposite to the second polarity (412B) and of the same polarity is used, thereby utilizing the first polarity ( 411B) repelling the same polarity as the third polarity (421B), and the principle that the second polarity (412B) and the fourth polarity (422B) are repelled by the same polarity enables the central axis (41B) to be The magnetic spring (42B) moves telescopically to accumulate kinetic energy.

In use, as shown in the seventh figure, the first planar spring (22B) and the magnetic spring (42B) of the energy storage unit (4B) are used to make the gas mover (3B) and the power piston (2B) Synchronous start, and provide the kinetic energy required for its movement, and it does not occupy too much space in the engine cavity (1B), so that the overall volume of the engine cavity (1B) can be reduced, especially The first planar spring (22B) and the magnetic spring (42B) do not generate lateral stress and lateral vibration when moving, so as not to affect the actuation, and the working fluid in the compression chamber (11B) is not The position of the power piston (2B) leaks out to achieve complete airtightness.

A fourth embodiment of the present invention, as shown in the eighth figure, wherein the engine cavity (1C) is internally provided with a compression chamber (11C) and an expansion chamber (12C), and the regeneration passage (31C) The expansion chamber (12C) and the compression chamber (11C) may be coupled to the working fluid to pass the regeneration passage (31C).

However, the above description is only the fourth embodiment of the present invention, and the scope of the patent application and the simple equivalent changes and replacements of the contents of the specification according to the present invention are not limited thereto. It is still within the scope of the protection covered by the scope of the invention.

(1)‧‧‧Engine cavity

(15) ‧ ‧ heating head

(16) ‧‧ ‧ cylinder

(161)‧‧‧Heat fins

(17)‧‧‧Base

(171)‧‧‧First mount

(172)‧‧‧Second mount

(18)‧‧‧Engine water jacket

(181)‧‧‧Water inlet

(182)‧‧‧Water outlet

(2) ‧‧‧Power Piston

(21)‧‧‧ Connecting rod

(22)‧‧‧First planar spring

(221)‧‧‧First junction hole

(222)‧‧‧First trench

(223)‧‧‧First fixed hole

(224)‧‧‧First screwing element

(3) ‧‧‧Diver

(32) ‧‧‧ third mount

(4) ‧‧‧ energy storage unit

(41)‧‧‧Central axis

(42)‧‧‧Second plane spring

(421)‧‧‧Second junction hole

(422)‧‧‧Second trench

(423)‧‧‧Second fixing hole

(424)‧‧‧Second screw components

Claims (6)

A free piston Stirling engine includes: an engine cavity having a compression chamber and an expansion chamber connected therein, and a regeneration passage between the compression chamber and the expansion chamber, the expansion chamber The second end is respectively provided with a heating end and a cooling end; a power piston is disposed in the compression chamber of the engine cavity, and the power piston is provided with a connecting rod, and one end of the connecting rod is combined with at least one first plane a spring, the first planar spring is fixed in the engine cavity; a gas mover is arranged in a hollow shape and is disposed in the expansion chamber of the engine cavity; an energy storage unit is connected to the power Between the piston and the air mover, the energy storage unit is provided with a central shaft, one end of the central shaft is connected to the power piston, and the other end of the central shaft is connected to a magnetic spring, and the central shaft is fastened. Having one of a first polarity and a second polarity, and the inner portion of the magnetic spring is respectively provided with a third polarity opposite to the first polarity and of the same polarity, and is disposed opposite to the second polarity One of the same polarity Using the first and the third polar polarity repel the same polarity, and the second polarity and the fourth polarity of the same polarity repel, so that the central axis of telescopic movement within the magnetic spring, whereby kinetic energy is accumulated. The free piston Stirling engine of claim 1, wherein the engine cavity system is formed by a heating head, a cylinder and a base, and the expansion chamber is disposed in the heating head, and the The compression chamber is disposed in the cylinder, the periphery of the cylinder is provided with a plurality of heat dissipation fins, and an engine water jacket is arranged around the outer edge of the cylinder, and the water jacket of the engine is respectively provided with a water inlet hole and a water outlet hole. A first fixing seat is disposed between one end of the base and the cylinder, and a second fixing seat is disposed at the other end of the base. The free piston Stirling engine of claim 2, wherein the first planar spring is fixed to the first mount and/or the second of the engine cavity by using a plurality of first screwing elements The first planar spring is provided with a plurality of first fixing holes, and the first fixing holes are provided for a first screwing element. The free piston Stirling engine according to claim 1, wherein the first planar spring is formed in a circular shape, and a first coupling hole is connected to the connecting rod at a center position thereof. And surrounding the first bonding hole is provided with a plurality of spiral first grooves. The free piston Stirling engine of claim 1, wherein the first polarity and the third polarity are an N pole, and the second polarity and the fourth polarity are an S pole. The free-piston Stirling engine according to claim 1, wherein the diameter of the air mover is smaller than the diameter of the expansion chamber, so that the gap between the air mover and the inner wall of the expansion chamber is separated from the regeneration. The passage, or the regeneration passage, connects the expansion chamber to the compression chamber in an external flow passage.