Free piston stirling engine and its exhaust balancer

Abstract

The present application relates to the technical field of stirling engine, especially to a free piston stirling engine and its expeller balancing device. The expeller balancing device of the free piston stirling engine is arranged on the gas spring assembly of the free piston stirling engine, and comprises: a moving magnetic assembly arranged on the spring piston; a fixed magnetic assembly arranged on the spring piston cylinder; wherein the moving magnetic assembly and the fixed magnetic assembly interact, and are suitable for forming a vertical force acting on the spring piston, the vertical force is the same as the direction of gravity of the expeller; and when the spring piston deviates from the initial position along the axial direction, the moving magnetic assembly and the fixed magnetic assembly interact, and are suitable for forming an axial force acting on the spring piston, under the axial force, the spring piston has a tendency to move to the initial position. In this way, the problem of the expeller tilting during reciprocating motion of the expeller can be avoided, and the problem of friction and wear between the expeller and the cylinder can be avoided.

Description

Technical Field

[0001] This invention relates to the field of Stirling engine technology, and more particularly to a free piston Stirling engine and its exhaust balancing device. Background Technology

[0002] A free-piston Stirling engine is a mechanical power device that utilizes the effect of heat generating self-excited oscillations in pressurized gas to convert heat into pressure fluctuations. To achieve ideal thermoacoustic conversion performance, an exhaust system is typically used to ensure that the pressure fluctuations and volumetric flow rate in the regenerator are in a specific acoustic field phase relationship. Most existing exhaust systems are supported by leaf springs and bolted to the exhaust piston. The leaf springs in the exhaust system serve two purposes: firstly, they provide radial support to ensure the gap seal is not compromised; secondly, they provide restoring force for the reciprocating motion of the exhaust system. With increasing single-unit power demands and the need for high reliability in engineering applications, mechanical spring structures struggle to provide sufficient stiffness and operating displacement. Furthermore, in specific high-temperature operating environments, the application of mechanical springs is further limited due to fatigue failure modes. Therefore, for high-power free-piston Stirling technology, gas springs can be used to achieve the appropriate stiffness matching.

[0003] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a free piston Stirling generator using a gas spring in the prior art.

[0004] The free-piston Stirling generator comprises an engine section consisting of an expansion chamber 1, a heater 2, a regenerator 3, a cooler 4, a compression chamber 5, an exhaust manifold 10, and a gas spring chamber 11, and a linear motor section consisting of a main piston 6, an inner stator 7, a coil 8, and an outer stator 9. The gas spring chamber 11 houses a spring piston cylinder and a spring piston 13, which cooperate to form a gas spring. The spring piston 13 is located at the end of the exhaust manifold 10. Opposed-type generators typically operate horizontally. In this horizontal configuration, the exhaust manifold 10 lacks radial constraint, and the significant weight difference between the dome cylinder 12 side and the spring piston 13 side causes the center of gravity of the exhaust manifold 10 to shift towards the dome cylinder side. During the reciprocating motion of the exhaust manifold, its tilt inevitably leads to friction and wear between the exhaust manifold and the cylinder, reducing its lifespan and reliability. Summary of the Invention

[0005] This invention provides a free piston Stirling engine and its exhaust balancing device, which can avoid the problem of exhaust tilting during the reciprocating motion of the exhaust, thereby avoiding the problem of friction and wear between the exhaust and the cylinder.

[0006] A first aspect of the present invention provides an exhaust balancing device for a free-piston Stirling engine, disposed on a gas spring assembly of the free-piston Stirling engine, wherein the gas spring assembly includes a spring piston and a spring piston cylinder, the spring piston being axially reciprocatingly slidable within the spring piston cylinder, and the exhaust balancing device includes:

[0007] The moving magnet assembly is mounted on the spring piston;

[0008] A fixed magnet assembly is mounted on the spring piston cylinder; wherein...

[0009] The moving magnetic component and the fixed magnetic component interact to generate a vertical force acting on the spring piston, the vertical force being in the same direction as the gravity of the discharger; and when the spring piston deviates axially from its initial position, the moving magnetic component and the fixed magnetic component interact to generate an axial force acting on the spring piston, under which the spring piston tends to move back to the initial position.

[0010] According to the exhaust balancing device for a free-piston Stirling engine provided by the present invention, the moving magnetic assembly includes a return-center magnet mover assembly, and the stationary magnetic assembly includes a return-center magnet stator assembly; wherein...

[0011] The centering magnet actuator assembly includes:

[0012] The first moving magnet and the second moving magnet are arranged sequentially along the axial direction of the spring piston;

[0013] The centering magnet stator assembly includes:

[0014] The first fixed magnet and the second fixed magnet are arranged sequentially along the axial direction of the spring piston cylinder;

[0015] The first moving magnet and the first fixed magnet correspond to each other and are magnetized in the same direction; the second moving magnet and the second fixed magnet correspond to each other and are magnetized in the same direction; the first moving magnet and the second moving magnet are magnetized in opposite directions, so that when the spring piston deviates axially from its initial position, the centering magnet moving part assembly and the centering magnet stator assembly interact to form the axial force.

[0016] According to the exhaust balancing device of the free piston Stirling engine provided by the present invention, the moving magnetic assembly further includes a balancing magnet mover assembly, and the stationary magnetic assembly includes a balancing magnet stator assembly. The balancing magnet mover assembly and the balancing magnet stator assembly interact to generate the vertical force.

[0017] According to the exhaust balancing device of the free piston Stirling engine provided by the present invention, the balancing magnet mover assembly is disposed at the radial top end and / or bottom end of the spring piston, and the balancing magnet stator assembly corresponds to the balancing magnet mover assembly.

[0018] According to the exhaust balancing device for a free-piston Stirling engine provided by the present invention, the return-center magnet mover assembly is configured in multiple groups and distributed circumferentially; the return-center magnet stator assembly is configured in multiple groups and is arranged in a one-to-one correspondence with the return-center magnet mover assembly; wherein,

[0019] The resultant force of the radial forces formed between the multiple sets of return magnet mover assemblies and the multiple sets of return magnet stator assemblies is zero; or, the direction of the resultant force of the radial forces is the same as the direction of gravity of the discharger.

[0020] The exhaust balancing device for a free-piston Stirling engine provided by the present invention further includes, in the case of the centering magnet mover assembly:

[0021] The first moving silicon steel component is provided with a first groove, and the first moving magnet and the second moving magnet are disposed in the first groove;

[0022] The centering magnet stator assembly also includes:

[0023] The first silicon steel component has a second groove, and the first fixed magnet and the second fixed magnet are disposed in the second groove.

[0024] According to the exhaust balancing device of the free piston Stirling engine provided by the present invention, the balancing magnet mover assembly includes a third moving magnet, and the balancing magnet stator assembly includes a third stator magnet or a second stator silicon steel component.

[0025] The exhaust balancing device for a free-piston Stirling engine provided by the present invention further includes, in the case of the balancing magnet mover assembly:

[0026] The second moving silicon steel component is provided with a third groove, and the third moving magnet is disposed in the third groove.

[0027] According to the exhaust balancing device for a free-piston Stirling engine provided by the present invention, the balancing magnet mover assembly includes:

[0028] The third moving magnet and the second moving silicon steel component, the second moving silicon steel component is provided with a third groove, and the third moving magnet is disposed in the third groove;

[0029] The balance magnet stator assembly includes:

[0030] The third fixed magnet and the second fixed silicon steel component, the second fixed silicon steel component is provided with a fourth groove, and the third fixed magnet is disposed in the fourth groove.

[0031] A second aspect of the present invention provides a free-piston Stirling engine, comprising:

[0032] A main piston and an exhaust device, the exhaust device passing through the main piston axially, the main piston being provided with a high-pressure gas chamber, the high-pressure gas chamber being used to exhaust high-pressure gas between the main piston and the exhaust device to form a gas bearing;

[0033] The end of the discharger is provided with a discharger balancing device as described in any of the preceding claims.

[0034] In the technical solution provided by this invention, a moving magnetic component and a fixed magnetic component are respectively provided on the spring piston and spring piston cylinder of the gas spring assembly. As the names suggest, the moving magnetic component is a magnetic component that can move with the spring piston, while the fixed magnetic component is fixed on the spring piston cylinder and has magnetism. Under the action of the magnetic force between the moving magnetic component and the fixed magnetic component, when the spring piston deviates axially from its initial position, an axial force is generated acting on the spring piston. Under the axial force, the spring piston tends to move back to its initial position, thereby providing axial stiffness to the spring piston and ensuring that the discharger is in an axially balanced position. Based on ensuring that the exhaust device is always in an axially balanced position, there is a magnetic field force between the moving magnetic assembly and the fixed magnetic assembly. This magnetic field force acts on the spring piston to form a vertical force. With this configuration, even if the weight of the dome cylinder side of the exhaust device is significantly greater than that of the gas spring piston side, the force on the exhaust device at both ends of the gas bearing can be kept basically balanced due to the aforementioned vertical force acting on the spring piston (the dome cylinder side and the gas spring piston side are located on opposite sides of the gas bearing). This avoids the exhaust device tilting towards the dome cylinder side due to the greater weight on the dome cylinder side, which would cause friction and wear between the exhaust device and the cylinder. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of a free piston Stirling generator using a gas spring in the prior art;

[0037] Figure 2This is a schematic diagram of the exhaust and main piston sections of the free piston Stirling engine in an embodiment of the present invention;

[0038] Figure 3a This is a schematic diagram of the centering magnet mover assembly and the centering magnet stator assembly in their initial positions according to an embodiment of the present invention;

[0039] Figure 3b This is a schematic diagram illustrating the interaction between the centering magnet mover assembly and the centering magnet stator assembly when they move relative to each other along the first direction in an embodiment of the present invention.

[0040] Figure 3c This is a schematic diagram illustrating the interaction between the centering magnet mover assembly and the centering magnet stator assembly when they move relative to each other along the second direction in an embodiment of the present invention.

[0041] Figure 4 This is a schematic diagram illustrating the interaction between the balance magnet mover assembly and the balance magnet stator assembly in an embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the moving magnet assembly and the stationary magnet assembly in the first embodiment of the present invention;

[0043] Figure 6 yes Figure 5 Schematic diagram of section AA;

[0044] Figure 7 yes Figure 5 Schematic diagram of the BB section;

[0045] Figure 8 This is a schematic diagram of the force applied to the discharge device in an embodiment of the present invention;

[0046] Figure 9 This is a schematic diagram of the moving magnet component and the stationary magnet component in the second embodiment of the present invention;

[0047] Figure 10 yes Figure 9 Schematic diagram of section AA;

[0048] Figure 11 This is a schematic diagram of the moving magnet assembly and the stationary magnet assembly in the third embodiment of the present invention;

[0049] Figure 12 yes Figure 11 Schematic diagram of section AA;

[0050] Figure 13 yes Figure 11 Schematic diagram of the BB section;

[0051] Figure 14 This is a schematic diagram of the moving magnet assembly and the stationary magnet assembly in the fourth embodiment of the present invention;

[0052] Figure 15 yes Figure 14 Schematic diagram of section AA;

[0053] Figure 16 yes Figure 14 Schematic diagram of the BB section;

[0054] Figure 17 This is a schematic diagram showing the damping test results of the discharger under different structures in the embodiments of the present invention.

[0055] Figure 1 middle:

[0056] 1. Expansion chamber; 2. Heater; 3. Regenerator; 4. Cooler; 5. Compression chamber; 6. Main piston; 7. Inner stator; 8. Coil; 9. Outer stator; 10. Discharge device; 11. Gas spring chamber; 12. Discharge device dome cylinder; 13. Spring piston;

[0057] Figures 2-16 middle:

[0058] 101. Spring piston; 102. Spring piston cylinder; 103. High-pressure air chamber; 110. Returning magnet mover assembly; 111. First moving magnet; 112. Second moving magnet; 113. First moving silicon steel component; 120. Returning magnet stator assembly; 121. First fixed magnet; 122. Second fixed magnet; 123. First fixed silicon steel component; 130. Balance magnet mover assembly; 131. Second moving silicon steel component; 132. Third moving magnet; 140. Balance magnet stator assembly; 141. Second fixed silicon steel component; 142. Third fixed magnet. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] In the description of this invention, it should be understood that the terms "upper", "lower", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0062] Please refer to Figures 2-16 This invention provides an exhaust balancing device for a free-piston Stirling engine, used to maintain the exhaust in a balanced state. It should be noted that the free-piston Stirling engine includes components such as a main piston, a cylinder, and an exhaust. The outer periphery of the exhaust fits with the inner wall of the cylinder, and the exhaust passes through the central hole of the main piston. The gap between the exhaust and the central hole of the main piston is sealed. A high-pressure gas chamber 103 is provided inside the main piston, supplying high-pressure gas between the exhaust and the main piston to form a gas bearing. Therefore, the main piston has a gas bearing bearing section for supporting the exhaust.

[0063] When a free-piston Stirling engine is placed horizontally, meaning its axis is on a horizontal plane, the heavier weight of the exhaust mandrel causes the exhaust mandrel's center of gravity to tilt towards that end, leading to increased friction and wear between the exhaust mandrel and the cylinder.

[0064] Therefore, the gas spring assembly of the free piston Stirling engine provided in this embodiment is equipped with an exhaust balancing device to balance the center of gravity of the exhaust and prevent the exhaust from tilting.

[0065] It should be noted that the gas spring assembly and the dome cylinder are located at the two ends of the discharger, respectively. The spring piston 101 of the gas spring assembly is located at the end of the discharger, and the spring piston 101 is axially reciprocatingly slidably within the spring piston cylinder 102.

[0066] The discharge balancing device provided in this embodiment includes a moving magnetic component and a fixed magnetic component. The moving magnetic component is mounted on the spring piston 101, moves synchronously with the spring piston 101, and is magnetic. The fixed magnetic component is fixedly mounted on the spring piston cylinder 102.

[0067] The moving magnetic component and the fixed magnetic component interact to generate a vertical force acting on the spring piston 101, which is in the same direction as the gravity of the discharger. Furthermore, when the spring piston 101 deviates from its initial position axially, the moving magnetic component and the fixed magnetic component interact to generate an axial force acting on the spring piston 101. Under the axial force, the spring piston 101 tends to move back to its initial position.

[0068] With this configuration, under the magnetic force between the moving and fixed magnetic components, when the spring piston 101 deviates axially from its initial position, an axial force is generated on the spring piston 101. Under this axial force, the spring piston 101 tends to move back to its initial position, thus providing axial stiffness and ensuring that the discharger is in an axially balanced position. While ensuring the discharger remains in an axially balanced position, the magnetic force between the moving and fixed magnetic components acts on the spring piston 101, forming a vertical force. Even if the weight of the dome cylinder side of the discharger is significantly greater than that of the gas spring piston 101 side, the vertical force acting on the spring piston 101 keeps the forces on both ends of the gas bearing essentially balanced (the dome cylinder side and the gas spring piston 101 side are located on opposite sides of the gas bearing). This prevents the discharger from tilting towards the dome cylinder side due to its greater weight, thus avoiding frictional wear between the discharger and the cylinder.

[0069] In some embodiments, such as Figure 3a As shown, the moving magnet assembly includes a centering magnet mover assembly 110, and the stationary magnet assembly includes a centering magnet stator assembly 120. The centering magnet mover assembly 110 includes a first moving magnet 111 and a second moving magnet 112, which are sequentially arranged along the axial direction of the spring piston 101. The centering magnet stator assembly 120 includes a first stationary magnet 121 and a second stationary magnet 122, which are sequentially arranged along the axial direction of the spring piston cylinder 102.

[0070] The first moving magnet 111 and the first fixed magnet 121 correspond to each other and are magnetized in the same direction; the second moving magnet 112 and the second fixed magnet 122 correspond to each other and are magnetized in the same direction; the first moving magnet 111 and the second moving magnet 112 are magnetized in opposite directions, so that when the spring piston 101 deviates from the initial position axially, the centering magnet moving part assembly 110 and the centering magnet stator assembly 120 interact to form an axial force.

[0071] With this configuration, in the initial position, the first movable magnet 111 and the first fixed magnet 121 correspond to each other, and their corresponding magnetic poles are opposite, meaning they attract each other; similarly, the second movable magnet 112 and the second fixed magnet 122 correspond to each other, and their corresponding magnetic poles are also opposite, meaning they attract each other. The axial displacement of the spring piston 101 is limited by the mutual attraction between the first movable magnet 111 and the first fixed magnet 121, and between the second movable magnet 112 and the second fixed magnet 122.

[0072] When the spring piston 101 deviates from its initial position along the first axis, or has a tendency to deviate from its initial position along the first axis, such as Figure 3b As shown, the combined effect of the attraction between the first moving magnet 111 and the first fixed magnet 121, the attraction between the second moving magnet 112 and the second fixed magnet 122, and the repulsive force between the second fixed magnet 122 and the first moving magnet 111 can effectively prevent the spring piston 101 from deviating from its initial position along the first axis.

[0073] Similarly, when the spring piston 101 deviates from its initial position along a second axis opposite to the first axis, or has a tendency to deviate from its initial position along the second axis, such as Figure 3c As shown, the combined effect of the attraction between the first moving magnet 111 and the first fixed magnet 121, the attraction between the second moving magnet 112 and the second fixed magnet 122, and the repulsive force between the second moving magnet 112 and the first fixed magnet 121 can effectively prevent the spring piston 101 from deviating from its initial position along the second axis.

[0074] This configuration ensures that the spring piston 101 has sufficient axial stiffness, guaranteeing good axial stability of the discharger.

[0075] In a further embodiment, such as Figure 4 As shown, the moving magnet assembly also includes a balancing magnet mover assembly 130, and the stationary magnet assembly includes a balancing magnet stator assembly 140. The balancing magnet mover assembly 130 and the balancing magnet stator assembly 140 interact to form a vertical force.

[0076] This configuration, under the action of the return magnet mover assembly 110 and the return magnet stator assembly 120, enables the spring piston 101 to maintain axial stability. While ensuring axial stability, the interaction of the balance magnet mover assembly 130 and the balance magnet stator assembly 140 allows the spring piston 101 to generate a vertical force that balances its center of gravity, thereby preventing the discharger from tilting and causing frictional wear.

[0077] In a further embodiment, such as Figure 5 As shown, the balancing magnet mover assembly 130 is disposed at the radial top end and / or bottom end of the spring piston 101, and the balancing magnet stator assembly 140 corresponds to the balancing magnet mover assembly 130. With this arrangement, when the balancing magnet mover assembly 130 and the balancing magnet stator assembly 140 are aligned, they generate a vertical force, which passes through the axis of the spring piston 101 and the spring piston cylinder 102, thereby balancing the center of gravity of the discharger.

[0078] In some embodiments, the centering magnet actuator assembly 110 is configured in multiple groups and distributed circumferentially. Specifically, the multiple groups of centering magnet actuator assemblies 110 are centrally symmetrically distributed, with the center of symmetry being the axis of the spring piston 101. For example, as... Figure 5 As shown, six centering magnet mover assemblies 110 are provided, with three on the left and three on the right. The centering magnet mover assemblies 110 on the left and right are centrally symmetrically distributed. In this embodiment, multiple sets of centering magnet stator assemblies 120 are provided, each corresponding to one of the centering magnet mover assemblies 110. This arrangement ensures that the radial magnetic forces acting on the symmetrically distributed centering magnet mover assemblies 110 can cancel each other out. Consequently, the resultant radial force between the multiple sets of centering magnet mover assemblies 110 and the multiple sets of centering magnet stator assemblies 120 is zero.

[0079] Of course, in another embodiment, the positions of the return magnet stator assembly 120 and the return magnet mover assembly 110 are set, such as... Figure 14 As shown, the radial resultant force between the two can also be aligned with the direction of the gravity of the discharger, thus achieving the effect of balancing the center of gravity.

[0080] In some embodiments, the centering magnet mover assembly 110 further includes a first moving silicon steel member 113, which has a first groove, and the first moving magnet 111 and the second moving magnet 112 are disposed in the first groove. The centering magnet stator assembly 120 further includes a first fixed silicon steel member 123, which has a second groove, and the first fixed magnet 121 and the second fixed magnet 122 are disposed in the second groove.

[0081] The balance magnet mover assembly 130 provided in this embodiment may include a third moving magnet 132, or it may include a third moving magnet 132 and a second moving silicon steel member 131, wherein the second moving silicon steel member 131 is provided with a third groove, and the third moving magnet 132 is disposed in the third groove.

[0082] The balancing magnet stator assembly 140 includes either a third fixed magnet 142 or a second fixed silicon steel member 141. That is, the balancing magnet stator assembly 140 may consist only of the third fixed magnet 142 or only of the second fixed silicon steel member 141. Alternatively, in another embodiment, the balancing magnet stator assembly 140 includes a third fixed magnet 142 and a second fixed silicon steel member 141, the second fixed silicon steel member 141 being provided with a fourth groove, and the third fixed magnet 142 being disposed within the fourth groove.

[0083] It should be noted that the magnets and silicon steel parts mentioned above can adopt a plate-like structure. The silicon steel parts are made of silicon steel, which has magnetic conductivity. When the magnets are installed in the grooves of the silicon steel parts, the magnets are in a state of being semi-enclosed by the silicon steel parts, which can effectively enhance the magnetic field.

[0084] In addition, the fixed magnet assembly is mounted on the spring piston cylinder 102, and the moving magnet assembly is mounted on the spring piston 101. Specifically, a mounting groove can be formed on the spring piston cylinder 102, and the fixed magnet assembly can be placed in the mounting groove. A mounting groove can also be formed on the spring piston 101, and the moving magnet assembly can be placed in the mounting groove of the spring piston 101.

[0085] This invention also provides a free-piston Stirling engine, including a main piston and an exhaust manifold, wherein the exhaust manifold passes axially through the main piston. The main piston is provided with a high-pressure gas chamber 103, which is used to discharge high-pressure gas between the main piston and the exhaust manifold to form a gas bearing. The end of the exhaust manifold is provided with an exhaust manifold balancing device as described in any of the above embodiments. The exhaust manifold with the above-mentioned balancing device can prevent its center of gravity from moving away from the bearing section of the gas bearing, thus avoiding the problem of exhaust manifold tilting and resulting frictional wear.

[0086] The following detailed and complete description of this solution is provided in conjunction with specific embodiments.

[0087] Example 1

[0088] like Figures 5-7 As shown, in this embodiment, a balance magnet mover assembly 130 and a balance magnet stator assembly 140 are respectively installed on the radial top of the spring piston 101 and the spring piston cylinder 102. The balance magnet mover assembly 130 includes a third moving magnet 132 and a second moving silicon steel member 131. The second moving silicon steel member 131 has a third groove, and the third moving magnet 132 is disposed within the third groove. The balance magnet stator assembly 140 includes a second fixed silicon steel member 141. The axial length of the second fixed silicon steel member 141 is greater than the axial length of the balance magnet mover assembly 130, so that during the reciprocating process, the balance magnet mover assembly 130 is subjected to a balance magnet stator assembly 140 of sufficient length to maintain the magnitude and point of application of the force without change. During the reciprocating motion of the discharger, the spring piston 101 will be subjected to a stable unidirectional force that is vertically downward and whose magnitude and point of application do not change, thus balancing the center of gravity of the discharger and preventing the discharger from tilting.

[0089] In addition, in this embodiment, six return magnet mover assemblies 110 and six return magnet stator assemblies 120 are provided respectively, and the return magnet mover assemblies 110 and six return magnet stator assemblies 120 are provided in a one-to-one correspondence, and the return magnet mover assemblies 110 and six return magnet stator assemblies 120 are symmetrically arranged on the left and right sides respectively.

[0090] Example 2

[0091] like Figures 9-10 As shown, in this embodiment, the arrangement of the centering magnet mover assembly 110 and the centering magnet stator assembly 120 is the same as in Embodiment 1. Furthermore, similar to Embodiment 1, a balance magnet mover assembly 130 and a balance magnet stator assembly 140 are respectively installed on the radial top of the spring piston 101 and the spring piston cylinder 102. The balance magnet mover assembly 130 includes a third moving magnet 132 and a second moving silicon steel member 131. The second moving silicon steel member 131 has a third groove, and the third moving magnet 132 is disposed within the third groove. The difference is that in this embodiment, the balance magnet stator assembly 140 includes a third fixed magnet 142 and a second fixed silicon steel member 141. The second fixed silicon steel member 141 has a fourth groove, and the third fixed magnet 142 is disposed within the fourth groove. Therefore, compared to the balance magnet stator assembly 140 in Embodiment 1, this embodiment can effectively enhance the magnetic force. When size is limited but the force requirement is large, a larger force can be obtained through this second embodiment.

[0092] Example 3

[0093] like Figures 11-13 As shown, unlike Embodiment 2, this embodiment can install a balancing magnet mover assembly 130 and a balancing magnet stator assembly 140 at the radial top and bottom of the spring piston 101 and the spring piston cylinder 102, respectively. The arrangement of the centering magnet mover assembly 110 and the centering magnet stator assembly 120 is the same as in Embodiments 1 and 2. With this arrangement, the radial top and bottom of the spring piston 101 are subjected to the magnetic force between the balancing magnet mover assembly 130 and the balancing magnet stator assembly 140, which can further increase the magnitude of the balancing force used to balance the center of gravity of the discharger.

[0094] Example 4

[0095] like Figures 14-16 As shown, this embodiment differs from Embodiments 1, 2, and 3 above. This embodiment does not include the balancing magnet mover assembly 130 and the balancing magnet stator assembly 140, but only includes the centering magnet mover assembly 110 and the centering magnet stator assembly 120. By adjusting the position of the centering magnet mover assembly 110 and the centering magnet stator assembly 120, the magnetic force between them is deviated from the center of the spring piston 101, and the resultant magnetic force formed between the multiple centering magnet mover assemblies 110 and the centering magnet stator assembly 120 is vertically downward, thereby balancing the center of gravity of the discharge device.

[0096] Please refer to Figure 17 , Figure 17This diagram illustrates the damping test results of the exhaust system under different structural conditions. The gap ∞ in the diagram represents the test results without magnetic silicon steel installed on the stator assembly. The results show that as the gap of the balance magnet decreases, the operating damping decreases from 4.53 Ns / m to 4.30 Ns / m under unbalanced conditions by arranging the balance magnet. The balance magnet refers to a heavy block fixed to the dome side of the exhaust system, simulating different distances of the exhaust system's center of gravity from the gas bearing bearing section. This verifies that the proposed balance magnet structure can effectively improve the gas support effect when the eccentric force deviates significantly from the gas bearing bearing center, ensuring frictionless system operation. For example, with a balance magnet of 0.88 kg, the operating damping can be reduced from 13.4 Ns / m to 5.9 Ns / m; with a balance magnet of 1.23 kg, the operating damping can be reduced from 47.0 Ns / m to 8.8 Ns / m.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A balancing device for the exhaust manifold of a free-piston Stirling engine, characterized in that, The gas spring assembly is mounted on a free-piston Stirling engine, wherein the gas spring assembly includes a spring piston (101) and a spring piston cylinder (102), the spring piston (101) being axially reciprocatingly slidable within the spring piston cylinder (102), and the exhaust balancing device includes: A moving magnetic assembly is disposed on the spring piston (101); A fixed magnet assembly is disposed on the spring piston cylinder (102); wherein, The moving magnetic component and the fixed magnetic component interact to generate a vertical force acting on the spring piston (101), the vertical force being in the same direction as the gravity of the discharger; and when the spring piston (101) deviates axially from its initial position, the moving magnetic component and the fixed magnetic component interact to generate an axial force acting on the spring piston (101), under which the spring piston (101) tends to move back to the initial position; The moving magnetic assembly includes a centering magnet mover assembly (110), and the stationary magnetic assembly includes a centering magnet stator assembly (120); wherein, The centering magnet actuator assembly (110) includes: The first moving magnet (111) and the second moving magnet (112) are arranged sequentially along the axial direction of the spring piston (101); The centering magnet stator assembly (120) includes: The first fixed magnet (121) and the second fixed magnet (122) are arranged sequentially along the axial direction of the spring piston cylinder (102); The first moving magnet (111) and the first fixed magnet (121) correspond to each other and are magnetized in the same direction; the second moving magnet (112) and the second fixed magnet (122) correspond to each other and are magnetized in the same direction; the first moving magnet (111) and the second moving magnet (112) are magnetized in opposite directions so that when the spring piston (101) deviates from its initial position axially, the centering magnet moving part assembly (110) and the centering magnet stator assembly (120) interact to form the axial force; The moving magnetic assembly further includes a balancing magnet mover assembly (130), and the stationary magnetic assembly includes a balancing magnet stator assembly (140). The balancing magnet mover assembly (130) and the balancing magnet stator assembly (140) interact to generate the vertical force.

2. The exhaust balancing device for a free-piston Stirling engine according to claim 1, characterized in that, The balance magnet mover assembly (130) is disposed at the radial top and / or bottom of the spring piston (101), and the balance magnet stator assembly (140) corresponds to the balance magnet mover assembly (130).

3. The exhaust balancing device for a free-piston Stirling engine according to claim 1, characterized in that, The return magnet mover assembly (110) is configured in multiple groups and distributed circumferentially; the return magnet stator assembly (120) is configured in multiple groups and is arranged in a one-to-one correspondence with the return magnet mover assembly (110); wherein, The resultant force of the radial forces formed between the multiple sets of the return magnet mover assembly (110) and the multiple sets of the return magnet stator assembly (120) is zero; or, the direction of the resultant force of the radial forces is the same as the direction of gravity of the discharger.

4. The exhaust balancing device for a free-piston Stirling engine according to claim 1, characterized in that, The centering magnet mover assembly (110) also includes: The first moving silicon steel part (113) is provided with a first groove, and the first moving magnet (111) and the second moving magnet (112) are disposed in the first groove; The centering magnet stator assembly (120) also includes: The first silicon steel part (123) is provided with a second groove, and the first fixed magnet (121) and the second fixed magnet (122) are disposed in the second groove.

5. The exhaust balancing device for a free-piston Stirling engine according to claim 1, characterized in that, The balance magnet mover assembly (130) includes a third moving magnet (132), and the balance magnet stator assembly (140) includes a third fixed magnet (142) or a second fixed silicon steel component (141).

6. The exhaust balancing device for a free-piston Stirling engine according to claim 5, characterized in that, The balancing magnet mover assembly (130) also includes: The second moving silicon steel part (131) is provided with a third groove, and the third moving magnet (132) is disposed in the third groove.

7. The exhaust balancing device for a free-piston Stirling engine according to claim 1, characterized in that, The balancing magnet mover assembly (130) includes: The third moving magnet (132) and the second moving silicon steel part (131) are provided with a third groove, and the third moving magnet (132) is disposed in the third groove; The balance magnet stator assembly (140) includes: The third fixed magnet (142) and the second fixed silicon steel part (141) are provided with a fourth groove, and the third fixed magnet (142) is disposed in the fourth groove.

8. A free-piston Stirling engine, characterized in that, include: A main piston and an exhaust device, the exhaust device passing through the main piston axially, the main piston being provided with a high-pressure gas chamber (103), the high-pressure gas chamber (103) being used to exhaust high-pressure gas between the main piston and the exhaust device to form a gas bearing; The end of the discharger is provided with a discharger balancing device as described in any one of claims 1-7.

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