Dual-opposed piston free piston generator with dual moving coil linear motors

Abstract

The present invention discloses a double-opposed piston free piston generator with a double moving coil linear motor, which includes an outer movable frame, an inner fixed container, a linear motor, a left combustion chamber and a right combustion chamber. The linear motor includes an outer mover, an inner mover and a linear motor stator. The double-opposed piston free piston generator with a double moving coil linear motor disclosed by the present invention adopts a hollow coil winding structure with a single permanent magnet stator and double movers. The moving directions of the outer movable frame and the piston assembly are always one to the right and the other to the left, and the working processes of the two combustion chambers are always complementary, one being in the expansion process and the other being in the compression process. It combines the advantages of opposed pistons and double piston free piston engines, having high power density, stable operation and being easy to control.

Description

Technical Field

[0001] The present invention relates to the technical field of range extenders for extended-range electric vehicles, and in particular to a double-opposed-piston free-piston generator with a double-moving-coil linear motor. Background Art

[0002] Extended-range electric vehicles (ERVs) also align with my country's all-electric drive development strategy for the automotive sector. The National Development and Reform Commission strongly encourages their development in its "Regulations on Investment Management in the Automotive Industry." Free-piston generators are a type of range extender that has recently emerged. Based on their structure, free-piston generators can be categorized into three types: single-piston, dual-piston, and opposed-piston. The single-piston type consists of a single combustion chamber and a linear motor, offering a simpler structure and easier control. However, due to the reciprocating motion of this type of structure, mechanical springs or air springs are required as restoring devices to provide a restoring force during compression. This leads to poor balance and accuracy. The dual-piston type does not require a restoring device, resulting in higher efficiency than the single-piston type, but also suffers from poor balance and, consequently, poor accuracy. The opposed-piston type consists of a single combustion chamber and two piston assemblies. The two piston assemblies move in opposite directions, resulting in optimal overall balance and reduced vibration and noise. However, the need for two linear motors makes the system more bulky. Furthermore, maintaining the synchronization of the two piston assemblies makes coordinated control difficult, requiring additional mechanical synchronization devices and resulting in poor real-time control accuracy. In summary, both the single-piston and double-piston types currently on the market have the problem of poor accuracy. Summary of the Invention

[0003] The purpose of the present invention is to provide a double-opposed-piston free-piston generator with a double-moving-coil linear motor, so as to solve the problem of poor accuracy of both single-piston and double-piston types currently on the market.

[0004] The present invention provides a double-opposed-piston free-piston generator with a double-moving-coil linear motor, comprising: an outer movable frame; an inner fixed container, arranged inside the outer movable frame; a linear motor, comprising an outer mover, an inner mover and a stator, wherein the inner mover is arranged inside the inner fixed container; the outer mover is fixed on the outer movable frame; the stator is fixed on the inner fixed container; and the inner mover is suspended inside the outer mover, and the stator is located in the annular space between the inner mover and the outer mover.

[0005] Preferably, it further includes: a left combustion chamber and a right combustion chamber, the left combustion chamber and the right combustion chamber are respectively arranged at both ends of the inner fixed container, and the inner mover is located between the left combustion chamber and the right combustion chamber; a piston assembly, including a left piston on the left side of the left combustion chamber, a right piston on the right side of the left combustion chamber, a left piston on the left side of the right combustion chamber, a right piston on the right side of the right combustion chamber, a left connecting rod, an intermediate connecting rod and a right connecting rod, the left piston on the left side of the left combustion chamber and the right piston on the right side of the left combustion chamber are respectively arranged on both sides inside the left combustion chamber, the left piston on the left side of the right combustion chamber and the right piston on the right side of the right combustion chamber are respectively arranged on both sides inside the right combustion chamber; the left end of the left connecting rod passes through the left end of the inner fixed container, and the left piston on the left side of the left combustion chamber is fixedly connected to the left end of the outer movable frame through the left connecting rod; the right end of the right connecting rod passes through the right end of the inner fixed container, and the right piston on the right side of the right combustion chamber is fixedly connected to the right end of the outer movable frame through the right connecting rod; the intermediate connecting rod is arranged inside the inner fixed container, and the inner mover is fixedly sleeved on the intermediate connecting rod, and the right piston on the right side of the left combustion chamber is fixedly connected to the left piston on the left side of the right combustion chamber through the intermediate connecting rod;

[0006] When the outer movable frame moves to the rightmost position, the right piston on the right side of the right combustion chamber approaches the right end of the inner fixed container, and at the same time the left end of the outer movable frame approaches the left end of the inner fixed container, the piston in the right combustion chamber reaches the farthest bottom dead center and the piston in the left combustion chamber reaches the farthest top dead center; when the outer movable frame moves to the leftmost position, the left piston on the left side of the left combustion chamber approaches the left end of the inner fixed container, and at the same time the right end of the outer movable frame approaches the right end of the inner fixed container, the piston in the left combustion chamber reaches the farthest bottom dead center and the piston in the right combustion chamber reaches the farthest top dead center.

[0007] Preferably, both the outer mover and the inner mover are cylindrical, and three-phase coil windings are arranged on them. The stator is cylindrical and is composed of a permanent magnet material and a magnetic conductive support structure. The outer mover, the stator and the inner mover form a hollow coil winding structure of a single permanent magnet stator and double movers from outside to inside.

[0008] Preferably, the outer movable frame includes a left fixed frame, a right fixed frame, at least two left rigid connecting rods and at least two right rigid connecting rods. The left fixed frame and the right fixed frame are arranged outside both ends of the inner fixed container, and the left end of the outer mover is fixedly connected to the left fixed frame through at least two left rigid connecting rods, and the right end of the outer mover is fixedly connected to the right fixed frame through at least two right rigid connecting rods, thus forming a whole to form the outer movable frame; the left piston on the left side of the left combustion chamber is fixedly connected to the left fixed frame through a left connecting rod, and the right piston on the right side of the right combustion chamber is fixedly connected to the right fixed frame through a right connecting rod.

[0009] Preferably, the left combustion chamber and the right combustion chamber are respectively fixedly connected to both ends of the stator. Among them, the left combustion chamber is located between the stator and the left fixing bracket, and the right combustion chamber is located between the stator and the right fixing bracket.

[0010] Preferably, the stator is arranged in the middle of the inner fixed container, and both ends of the area of the inner fixed container where the stator is located are respectively fixedly connected to the left combustion chamber and the right combustion chamber.

[0011] Preferably, at least a left support and a right support are configured at the bottom end of the inner fixed container. The lower left rigid connecting rod and the lower right rigid connecting rod should avoid the left support and the right support; or left rigid connecting rod movement spaces and right rigid connecting rod movement spaces are respectively opened in the left support and the right support, and the lower left rigid connecting rod and the lower right rigid connecting rod respectively pass through the left rigid connecting rod movement space and the right rigid connecting rod movement space.

[0012] Preferably, the three-phase coil windings of the inner mover and the outer mover are respectively electrically connected to a power converter, and the power converter is configured with a battery pack.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The present invention discloses a double-opposed piston free piston generator with a double moving coil linear motor. The generator has two combustion chambers, can simultaneously realize double-cylinder combustion operation, and at the same time, the overall volume and mass have no obvious increase compared with the double-piston free piston generator, and has the characteristics of high power density; the left piston on the left side of the left combustion chamber and the right piston on the right side of the left combustion chamber, as well as the left piston on the left side of the right combustion chamber and the right piston on the right side of the right combustion chamber are respectively arranged in an opposed manner, so the balance of the whole system is extremely good, and the vibration and noise can be well reduced. When applied as a range extender to an electric vehicle, the vehicle noise can be significantly reduced; the linear motor part adopts a cylindrical structure, which can well solve the problem of many leakage magnetic paths of the flat linear motor; the inner mover and the outer mover respectively use the inner and outer coil windings as the mover of the linear motor, and the permanent magnet stator as the stator of the linear motor. This hollow coil winding structure can not only reduce the mass of the piston assembly, but also reduce the material mass of the permanent magnet and lower the manufacturing cost; increase the operating range of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a double-opposed piston free piston generator with a double moving coil linear motor provided by Embodiment 1 of the present invention;

[0016] Figures 2 to 7Schematic diagram of the working state of a double-opposed piston free-piston generator with a double moving coil linear motor provided in Embodiment 1 of the present invention, where the arrow direction indicates the movement direction of the gas or piston assembly;

[0017] In Figure 2 , the left combustion chamber intakes air and expands, while the right combustion chamber undergoes a compression process;

[0018] In Figure 3 , the piston in the left combustion chamber reaches the bottom dead center and the volume reaches the maximum, while the piston in the right combustion chamber reaches the top dead center and the volume is the smallest;

[0019] In Figure 4 , fuel is injected and ignited in the right combustion chamber, and the combustion expansion pushes the piston assembly to move, causing the three-phase coil windings of the outer mover and the inner mover to cut the magnetic force lines in the magnetic field formed by the stator permanent magnet to generate electric energy, while compressing the working medium in the left combustion chamber;

[0020] In Figure 5 , the piston in the left combustion chamber reaches the top dead center and the piston in the right combustion chamber reaches the bottom dead center;

[0021] In Figure 6 , fuel is injected and ignited in the left combustion chamber, and the expansion pushes the piston assembly to move, causing the three-phase coil windings of the outer mover and the inner mover to cut the magnetic force lines in the magnetic field formed by the stator permanent magnet to generate electric energy, while exhausting the waste gas in the right combustion chamber;

[0022] In Figure 7 , the right combustion chamber intakes air and expands, while compressing the waste gas discharged from the left combustion chamber.

[0023] Explanation of reference numerals: 1 - outer movable frame; 2 - inner fixed container; 21 - left combustion chamber; 22 - right combustion chamber; 3 - linear motor; 31 - outer mover; 32 - inner mover; 3 – stator; 11 - left fixed frame; 12 - right fixed frame; 13 - left rigid connecting rod; 14 - right rigid connecting rod; 51 - left connecting rod; 52 - intermediate connecting rod; 53 - right connecting rod; 41 - left piston on the left side of the left combustion chamber; 42 - right piston on the left side of the left combustion chamber; 43 - left piston on the right side of the right combustion chamber; 44 - right piston on the right side of the right combustion chamber; 210 - left support; 220 - right support. Detailed implementation mode

[0024] Embodiment 1

[0025] Embodiment 1 provides a double-opposed piston free-piston generator with a double moving coil linear motor, where the linear motor is a double moving coil cylindrical linear motor, and the generator is a double-opposed piston free-piston generator. Its structure will be described in detail below.

[0026] Refer to Figure 1, the double-opposed piston free piston generator with a double moving coil linear motor includes an outer movable frame 1, an inner fixed container 2, a linear motor 3, a left combustion chamber 21, a right combustion chamber 22, and a piston assembly.

[0027] The inner fixed container 2 is arranged inside the outer movable frame 1.

[0028] The linear motor 3 includes an outer mover 31, an inner mover 32, and a stator 33. Among them, the inner mover 32 is cylindrical and is provided with a three-phase coil winding. The inner mover 32 is arranged inside the inner fixed container 2; the outer mover 31 is cylindrical and is provided with a three-phase coil winding. The outer mover 31 is fixed in the middle of the outer movable frame 1; the stator 33 is cylindrical and is composed of a permanent magnet material and a magnetic-conducting support structure. The stator 33 is fixed in the middle of the inner fixed container 2; and the inner mover 32 is suspended inside the outer mover 31. The stator 33 is located in the annular space between the inner mover 32 and the outer mover 31. The outer mover 31, the stator 33, and the inner mover 32 form a hollow coil winding structure with a single permanent magnet stator and double movers from outside to inside.

[0029] The left combustion chamber 21 and the right combustion chamber 22 are respectively arranged at both ends of the inner fixed container 2. Among them, the left combustion chamber 21 is located between the stator 33 and the left fixed frame 11, and the right combustion chamber 22 is located between the stator 33 and the right fixed frame 12. The inner mover 32 is located between the left combustion chamber 21 and the right combustion chamber 22.

[0030] There are two groups of piston assemblies. One group includes a left piston 41 on the left side of the left combustion chamber, a left connecting rod 51, the outer movable frame 1, the outer mover 31 of the linear motor, a right connecting rod 53, and a right piston 44 on the right side of the right combustion chamber. The other group of piston assemblies includes a right piston 42 on the right side of the left combustion chamber, a left piston 43 on the left side of the right combustion chamber, an intermediate connecting rod 52, and the inner mover 32 of the linear motor.

[0031] On both sides inside the left combustion chamber 21, there are respectively a left piston 41 on the left side of the left combustion chamber and a right piston 42 on the right side of the left combustion chamber. On both sides inside the right combustion chamber 22, there are respectively a left piston 43 on the left side of the right combustion chamber and a right piston 44 on the right side of the right combustion chamber.

[0032] The left end of the left connecting rod 51 passes through the left end of the inner fixed container 2. The left piston 41 on the left side of the left combustion chamber is fixedly connected to the left end of the outer movable frame 1 through the left connecting rod 51.

[0033] The right end of the right connecting rod 53 passes through the right end of the inner fixed container 2. The right piston 44 on the right side of the right combustion chamber is fixedly connected to the right end of the outer movable frame 1 through the right connecting rod 53.

[0034] The intermediate connecting rod 52 is arranged inside the inner fixed container 2, and the inner mover 32 is fixedly sleeved on the intermediate connecting rod 52. The right piston 42 on the right side of the left combustion chamber is fixedly connected to the left piston 43 on the left side of the right combustion chamber through the intermediate connecting rod 52.

[0035] As a free piston generator, during the working cycle, for different combustion working fluids, in order to fully optimize the combustion process of the working fluid and improve the work efficiency, this device has different piston strokes, top dead centers and bottom dead centers.

[0036] When the outer movable frame 1 moves to the right, the piston 44 on the right side of the right combustion chamber approaches the right end of the inner fixed container 2, and at the same time the left end of the outer movable frame 1 approaches the left end of the inner fixed container 2. When the piston in the right combustion chamber 22 reaches the farthest bottom dead center and the piston in the left combustion chamber 21 reaches the farthest top dead center, at this time, the outer movable frame 1 is in the rightmost position, the volume of the left combustion chamber 21 is compressed to the smallest, and the volume of the right combustion chamber 22 expands to the largest, as Figure 1 shown; when the outer movable frame 1 moves to the left, the piston 41 on the left side of the left combustion chamber approaches the left end of the inner fixed container 2, and at the same time the right end of the outer movable frame 1 approaches the right end of the inner fixed container 2. When the piston in the left combustion chamber 21 reaches the farthest bottom dead center and the piston in the right combustion chamber 22 reaches the farthest top dead center, at this time, the outer movable frame 1 is in the leftmost position, the volume of the right combustion chamber 22 is compressed to the smallest, and the volume of the left combustion chamber 21 expands to the largest, as Figure 3 shown.

[0037] Specifically, the outer movable frame 1 is composed of a left fixed frame 11, a right fixed frame 12, at least two left rigid connecting rods 13 and at least two right rigid connecting rods 14. Among them, the left fixed frame 11 and the right fixed frame 12 are arranged outside both ends of the inner fixed container 2, and the left end of the outer rotor 31 is fixedly connected to the left fixed frame 11 through the left rigid connecting rod 13, and the right end of the outer rotor 31 is fixedly connected to the right fixed frame 12 through the right rigid connecting rod 14, thus forming a whole to form the outer movable frame 1.

[0038] Further, the left piston 41 on the left side of the left combustion chamber is fixedly connected to the left fixed frame 11 through a left connecting rod 51, and the right piston 44 on the right side of the right combustion chamber is fixedly connected to the right fixed frame 12 through a right connecting rod 53.

[0039] Specifically, the stator 33 is arranged in the middle of the inner fixed container 2, and both ends of the area of the inner fixed container 2 where the stator 33 is located are fixedly connected to the left combustion chamber 21 and the right combustion chamber 22 respectively.

[0040] In order to support the entire housing, at least a left support 210 and a right support 220 are arranged at the bottom ends of the left combustion chamber 21 and the right combustion chamber 22. The left rigid connecting rod 13 and the right rigid connecting rod 14 should pass through or avoid the left support 210 and the right support 220 so as to be able to move.

[0041] Specifically, the lower left rigid link 13 and the lower right rigid link 14 should avoid the left support 210 and the right support 220; alternatively, a left rigid link movement space and a right rigid link movement space are respectively formed in the left support 210 and the right support 220, and the lower left rigid link 13 and the lower right rigid link 14 respectively pass through the left rigid link movement space and the right rigid link movement space.

[0042] More specifically, the left rigid link movement space or the right rigid link movement space can be a through hole for the left rigid link or the right rigid link to move, or can be a grid hole on the grid.

[0043] In order to store and supply electric energy, the linear motor generator integrated machine is configured with a power converter 6 and a battery pack 7. The three-phase coil windings of the inner mover 32 and the outer mover 31 are respectively connected to the power converter 6 by wire, and the power converter 6 stores the alternating current generated by the linear motor in the battery pack 7 through PWM rectification.

[0044] Embodiment 2

[0045] Embodiment 2 provides a working method of a double-opposed piston free piston generator with a double moving coil linear motor, adopting the double-opposed piston free piston generator with a double moving coil linear motor provided in Embodiment 1, which specifically includes the following steps:

[0046] When the piston in the left combustion chamber 21 reaches near the top dead center, the left combustion chamber 21 is ignited, and the high-temperature and high-pressure gas expands. The expansion force respectively pushes the left piston 41 on the left side of the left combustion chamber to move leftward and the right piston 42 on the right side of the left combustion chamber to move rightward. The working medium volume of the left combustion chamber 21 increases, as Figure 2 shown; the intake port of the left combustion chamber 21 is closed;

[0047] During the rightward movement of the right piston 42 in the left combustion chamber, it pushes the intermediate connecting rod 52 to move rightward, and the intermediate connecting rod 52 drives the inner mover 32 to move rightward; at the same time, during the leftward movement of the left piston 41 in the left combustion chamber, it pushes the outer movable frame 1 to move leftward through the left connecting rod 51. During the leftward movement of the entire outer movable frame 1, the outer movable frame 1 drives the outer mover 31 to move leftward. At this time, the three-phase coil windings in the inner mover 32 and the outer mover 31 cut the magnetic force lines in the magnetic field formed by the permanent magnets of the stator 33, generating induced electromotive force and current, and the generated electric energy is stored in the battery pack 7 through the power converter 6;

[0048] Meanwhile, the middle connecting rod 52 pushes the piston 43 on the left side of the right combustion chamber to move to the right, causing the piston 43 on the left side of the right combustion chamber to compress the gas in the right combustion chamber 22 to the right. At the same time, as the entire outer movable frame 1 moves to the left, the right fixed frame 12 pushes the right connecting rod 53 to move to the left during the movement process, and then pushes the piston 44 on the right side of the right combustion chamber to move to the left to compress the gas in the right combustion chamber 22. The gas on both the left and right sides of the right combustion chamber 22 is under pressure, and the entire right combustion chamber 22 is in the compression process.

[0049] The gas in the left combustion chamber 21 continues to expand until the piston reaches the bottom dead center, and the volume of the combustion chamber reaches the maximum. At the same time, the piston in the right combustion chamber 22 reaches the top dead center, and the gas is compressed to the minimum volume, as Figure 3 shown, completing the first stroke; the exhaust port and scavenging port of the left combustion chamber 21 are opened in sequence to start exhaust and scavenging;

[0050] After that, the fuel in the right combustion chamber 22 is injected, ignited, burned and expanded. The expansion force pushes the piston 43 on the left side of the right combustion chamber to move to the left and the piston 44 on the right side of the right combustion chamber to move to the right respectively, and the working medium volume in the right combustion chamber 22 increases;

[0051] During the process of the piston 43 on the left side of the right combustion chamber moving to the left, it pushes the middle connecting rod 52 to move to the left, and the middle connecting rod 52 drives the inner mover 32 to move to the left; at the same time, during the process of the piston 44 on the right side of the right combustion chamber moving to the right, it pushes the outer movable frame 1 to move to the right through the right connecting rod 53. During the process of the entire outer movable frame 1 moving to the right, the outer movable frame 1 drives the outer mover 31 to move to the right. At this time, the three-phase coil windings in the inner mover 32 and the outer mover 31 cut the magnetic force lines in the magnetic field formed by the permanent magnet of the stator 33, generating induced electromotive force and current. The generated electric energy is processed by the power converter 6 and then stored in the battery pack 7;

[0052] Meanwhile, the middle connecting rod 52 pushes the piston 42 on the right side of the left combustion chamber to move to the left, causing the piston 42 on the right side of the left combustion chamber to compress the gas in the left combustion chamber 21 to the left. At the same time, as the entire outer movable frame 1 moves to the right, the left fixed frame 11 pushes the left connecting rod 51 to move to the right during the movement process, and then pushes the piston 41 on the left side of the left combustion chamber to move to the right to compress the gas in the left combustion chamber 21. The gas on both the left and right sides of the left combustion chamber 21 is under pressure, and the entire left combustion chamber 21 is in the compression process. During this period, the exhaust ends and the intake starts, as Figure 4 shown;

[0053] Until the piston in the left combustion chamber 21 is compressed to the top dead center and the piston in the right combustion chamber 22 reaches the bottom dead center, as Figure 5 shown, completing the second stroke;

[0054] The intake of the left combustion chamber 21 ends.

[0055] Open the exhaust port and scavenging port of the right combustion chamber 22 successively for exhaust and scavenging;

[0056] Fuel is injected and ignited in the left combustion chamber 21, and combustion expansion occurs. The expansion force drives the left piston 41 on the left side of the left combustion chamber to move leftward and the right piston 42 on the right side of the left combustion chamber to move rightward respectively;

[0057] During the process of the right piston 42 on the right side of the left combustion chamber moving rightward, it drives the intermediate connecting rod 52 to move rightward, and the intermediate connecting rod 52 drives the inner mover 32 to move rightward; at the same time, during the process of the left piston 41 on the left side of the left combustion chamber moving leftward, it drives the outer movable frame 1 to move leftward through the left connecting rod 51. During the process of the entire outer movable frame 1 moving leftward, the outer movable frame 1 drives the outer mover 31 to move leftward. At this time, the three-phase coil windings in the inner mover 32 and the outer mover 31 cut the magnetic force lines in the magnetic field formed by the permanent magnets of the stator 33, generating induced electromotive force and current. The generated electric energy is stored in the battery pack 7 after being converted by the power converter 6;

[0058] Meanwhile, the intermediate connecting rod 52 drives the left piston 43 on the left side of the right combustion chamber to move rightward, causing the left piston 43 on the left side of the right combustion chamber to compress the gas in the right combustion chamber 22 to the right. At the same time, as the entire outer movable frame 1 moves leftward, the right fixed frame 12 pushes the right connecting rod 53 to move leftward, thereby driving the right piston 44 on the right side of the right combustion chamber to move leftward to compress the gas in the right combustion chamber 22. The gas in the right combustion chamber 22 is compressed on both the left and right sides, and the entire right combustion chamber 22 is in the compression process. The exhaust gas in the right combustion chamber 22 is discharged through the exhaust port, as Figure 6 [[ID=ll]]shown;

[0059] Open the intake port of the right combustion chamber 22 for intake and open the exhaust port of the left combustion chamber 21 for exhaust;

[0060] Ignition and expansion occur in the right combustion chamber 22, repeating the steps of the left combustion chamber 21 in the first stroke, and at the same time compressing the exhaust gas discharged from the left combustion chamber 21, as Figure 7 shown;

[0061] Figures 2 to 7 After the process of

[0062] ends, one cycle is completed and it enters the next cycle from the beginning.

[0063] Whether in the first stroke or the second stroke, the operations of the left combustion chamber 21 and the right combustion chamber 22 are always complementary, with one expanding and the other compressing.

[0064] Although the present invention has been described in detail above with general descriptions and specific embodiments, on the basis of the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of the present invention claimed.

Claims

1. A double-opposed piston free piston generator with a double moving coil linear motor, characterized in that, Comprising: An outer movable frame (1); An inner fixed container (2), disposed inside the outer movable frame (1); A linear motor (3), including an outer mover (31), an inner mover (32) and a stator (33), the inner mover (32) being disposed inside the inner fixed container (2); the outer mover (31) being fixed to the outer movable frame (1); the stator (33) being fixed to the inner fixed container (2); and the inner mover (32) being suspended inside the outer mover (31), the stator (33) being located in the annular space between the inner mover (32) and the outer mover (31); wherein, both the outer mover (31) and the inner mover (32) are cylindrical, and three-phase coil windings are provided thereon, the stator (33) is cylindrical and composed of a permanent magnet material and a magnetic conductive support structure, and the outer mover (31), the stator (33) and the inner mover (32) form a hollow coil winding structure of a single permanent magnet stator and double movers from outside to inside; A left combustion chamber (21) and a right combustion chamber (22), the left combustion chamber (21) and the right combustion chamber (22) being respectively disposed at both ends of the inner fixed container (2), and the inner mover (32) being located between the left combustion chamber (21) and the right combustion chamber (22); A piston assembly, including a left piston on the left side of the left combustion chamber (41), a right piston on the left side of the left combustion chamber (42), a left piston on the right side of the right combustion chamber (43), a right piston on the right side of the right combustion chamber (44), a left connecting rod (51), an intermediate connecting rod (52) and a right connecting rod (53), The left piston on the left side of the left combustion chamber (41) and the right piston on the left side of the left combustion chamber (42) are respectively disposed on both sides inside the left combustion chamber (21), and the left piston on the right side of the right combustion chamber (43) and the right piston on the right side of the right combustion chamber (44) are respectively disposed on both sides inside the right combustion chamber (22); The left end of the left connecting rod (51) passes through the left end of the inner fixed container (2), and the left piston on the left side of the left combustion chamber (41) is fixedly connected to the left end of the outer movable frame (1) through the left connecting rod (51); The right end of the right connecting rod (53) passes through the right end of the inner fixed container (2), and the right piston on the right side of the right combustion chamber (44) is fixedly connected to the right end of the outer movable frame (1) through the right connecting rod (53); The intermediate connecting rod (52) is disposed inside the inner fixed container (2), and the inner mover (32) is fixedly sleeved on the intermediate connecting rod (52), and the right piston on the left side of the left combustion chamber (42) and the left piston on the right side of the right combustion chamber (43) are fixedly connected through the intermediate connecting rod (52); When the outer movable frame (1) moves to the rightmost position, the piston (44) on the right side of the right combustion chamber approaches the right end of the inner fixed container (2). At the same time, the left end of the outer movable frame (1) approaches the left end of the inner fixed container (2). The piston of the right combustion chamber (22) reaches the farthest bottom dead center and the piston of the left combustion chamber (21) reaches the farthest top dead center. When the outer movable frame (1) moves to the leftmost position, the piston (41) on the left side of the left combustion chamber approaches the left end of the inner fixed container (2). At the same time, the right end of the outer movable frame (1) approaches the right end of the inner fixed container (2). The piston of the left combustion chamber (21) reaches the farthest bottom dead center and the piston of the right combustion chamber (22) reaches the farthest top dead center.

2. The double-opposed piston type free piston generator with a double moving coil linear motor according to claim 1, characterized in that the outer movable frame (1) includes a left fixed frame (11), a right fixed frame (12), at least two left rigid connecting rods (13) and at least two right rigid connecting rods (14), the left fixed frame (11) and the right fixed frame (12) are arranged outside both ends of the inner fixed container (2), and the left end of the mover (31) is fixedly connected to the left fixed frame (11) through at least two of the left rigid connecting rods (13). The right end of the mover (31) is fixedly connected to the right fixed frame (12) through at least two of the right rigid connecting rods (14), thus forming a whole to form the outer movable frame (1); the left connecting rod (51) is fixedly connected between the left combustion chamber left piston (41) and the left fixed frame (11), and the right connecting rod (53) is fixedly connected between the right combustion chamber right piston (44) and the right fixed frame (12).

3. The double-opposed piston type free piston generator with a double moving coil linear motor according to claim 2, characterized in that the left combustion chamber (21) and the right combustion chamber (22) are respectively fixedly connected to both ends of the stator (33). Among them, the left combustion chamber (21) is located between the stator (33) and the left fixed frame (11), and the right combustion chamber (22) is located between the stator (33) and the right fixed frame (12).

4. The double-opposed piston type free piston generator with a double moving coil linear motor as claimed in claim 3, wherein, The stator (33) is arranged in the middle of the inner fixed container (2), and both ends of the area of the inner fixed container (2) where the stator (33) is located are respectively fixedly connected to the left combustion chamber (21) and the right combustion chamber (22).

5. The double-opposed piston type free piston generator with a double moving coil linear motor according to claim 4, characterized in that at least a left support (210) and a right support (220) are arranged at the bottom end of the inner fixed container (2), and the lower left rigid connecting rods (13) and the right rigid connecting rods (14) should avoid the left support (210) and the right support (220); Alternatively, a left rigid link movement space and a right rigid link movement space are respectively formed in the left support (210) and the right support (220), and the lower left rigid link (13) and the right rigid link (14) respectively pass through the left rigid link movement space and the right rigid link movement space.

6. The double-opposed piston free-piston generator with a double moving coil linear motor according to claim 1, characterized in that, The three-phase coil windings of the inner mover (32) and the outer mover (31) are respectively electrically connected to a power converter (6), and the power converter (6) is configured with a battery pack (7).

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