Free piston Stirling generator with coaxial debugging device and debugging method thereof

Abstract

The invention discloses a free piston Stirling generator with a coaxial debugging device and a debugging method of the free piston Stirling generator. The debugging method comprises the steps that N spaced power piston plate spring fixing screws are adjusted to a specific tightness degree; a first linear motor rotor is excited to enable a power piston to vibrate up and down; a power piston plate spring adjusting screw is adjusted, so that a power piston plate spring generates transverse fine movement; the remaining N power piston plate springs are used for completely fixing the power piston plate springs; n spaced air distribution piston plate spring fixing screws are adjusted to a specific tightness degree; a second linear motor rotor is excited, so that the gas distribution piston vibrates up and down; an air distribution piston plate spring adjusting screw is adjusted, so that an air distribution piston plate spring generates transverse fine movement; and completely fixing the gas distribution piston plate springs by using the remaining N gas distribution piston plate springs. The axial deviation of the piston and the air cylinder can be dynamically compensated in the debugging process, and friction-free coaxial debugging is achieved.

Description

Technical Field

[0001] The present invention relates to a free piston Stirling generator, and more particularly to a free piston Stirling generator with a coaxial debugging device and a debugging method thereof. Background Art

[0002] As an efficient thermal-electric conversion device, the Stirling generator is widely used in spacecraft power systems, military equipment, industrial waste heat recovery and other fields due to its high reliability, low noise and adaptability to various heat sources (such as solar energy, biomass energy, geothermal energy, nuclear energy, etc.). Its core performance depends on the precise coaxial movement of the power piston and the gas distribution piston in the cylinder. Any minor assembly deviation will lead to increased frictional losses, seal failure and efficiency reduction, and in severe cases, even mechanical jamming. The gaps between the power piston and the gas distribution piston and the cylinder are usually dozens of micrometers or even a few micrometers, making the assembly difficult.

[0003] Currently, the assembly and debugging of traditional Stirling generators generally adopt a combination of mechanical positioning and manual adjustment: the cylinder and the support frame are fixed by welding or bolts, the end face runout value of the piston is measured by a dial indicator, and rough coaxial correction is achieved by tapping with a copper rod or adjusting with gaskets. However, limited by the rigid constraints of the mechanical structure and the dependence on manual experience, it cannot dynamically compensate for minor deviations after assembly and debugging, resulting in the following problems: (1) extremely high requirements for the machining accuracy of parts, and a high assembly failure rate, increasing production costs. (2) Manual calibration takes a long time, lacks real-time feedback means, and it is difficult to quickly judge whether the coaxiality meets the standard; moreover, the debugging process depends on imported high-precision laser alignment instruments, resulting in high debugging costs. Specifically, to ensure the coaxiality of the piston and the cylinder, ultra-high-precision machine tools are required to machine parts, resulting in high manufacturing costs and difficult-to-fully-eliminate machining errors, and the assembly failure rate remains high; the manual calibration process depends on experienced technicians to achieve rough positioning by tapping or adjusting gaskets, which takes up to several hours, and lacks a real-time feedback mechanism, unable to quickly verify whether the coaxiality meets the standard. The debugging process also depends on imported high-precision laser alignment instruments, further driving up the equipment investment and usage costs. In addition, the existing process relies on off-line detection or manual visual inspection, and cannot monitor the friction state in real time during the assembly and debugging process. The quality of assembly and debugging highly depends on the skill level of the operator, and the consistency is difficult to guarantee. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above deficiencies in the background art and provide a free piston Stirling generator with a coaxial debugging device. Through the pre-tightening force balance design of the leaf spring adjusting screw and the rubber ring, combined with double electromagnetic drive and real-time monitoring of the acceleration waveform, the axial deviation between the piston and the cylinder can be dynamically compensated during the debugging process, realizing frictionless coaxial debugging.

[0005] The technical solution adopted by the present invention to solve its technical problems is a free piston Stirling generator with a coaxial debugging device, which includes a Stirling generator body and a coaxial debugging device. The Stirling generator body includes a gas distribution piston, a power piston, a cylinder, a gas distribution piston leaf spring, a power piston leaf spring, a first linear motor, and a second linear motor. The first linear motor includes a first linear motor stator and a first linear motor mover, and the second linear motor includes a second linear motor stator and a second linear motor mover. The coaxial debugging device includes a first support frame, a second support frame, a power piston acceleration sensor, a gas distribution piston acceleration sensor, a power piston leaf spring adjusting device, a gas distribution piston leaf spring adjusting device, and an oscilloscope. The power piston acceleration sensor and the gas distribution piston acceleration sensor are connected to the oscilloscope. The first support frame covers the Stirling generator body, the second support frame covers the top of the first support frame, the cylinder and the first linear motor stator are fixed to the first support frame, the gas distribution piston is placed at the bottom of the cylinder, the power piston and the first linear motor mover are fixed on the power piston leaf spring, the power piston leaf spring is horizontally fixed on the first support frame, the gas distribution piston leaf spring is horizontally fixed on the second support frame, the gas distribution piston rod passes through the power piston, the power piston leaf spring, and the gas distribution piston leaf spring, one end of the gas distribution piston rod is connected to the gas distribution piston, and the other end is connected to the second linear motor mover. The second linear motor stator is nested on the second linear motor mover and fixed to the second support frame. The power piston acceleration sensor is fixed on the power piston leaf spring, and the gas distribution piston acceleration sensor is fixed on the gas distribution piston leaf spring.

[0006] Further, the first support frame is a hollow cylindrical structure with openings at both ends. The bottom of the first support frame expands outwards in a circle and is connected to the cylinder. The middle of the first support frame expands outwards in a circle to form a first platform, and the top of the first support frame expands outwards in a circle to form a second platform. The power piston leaf spring is located on the first platform, and the gas distribution piston leaf spring is located on the second platform. The second support frame is a cover body structure with an opening at one end, and the opening end of the second support frame is connected to the second platform.

[0007] Further, the power piston leaf spring adjusting device includes a power piston leaf spring adjusting rubber ring, a power piston leaf spring adjusting screw, and a power piston leaf spring fixing screw. Longitudinal 2 N through holes are evenly distributed on the peripheral edge of the power piston leaf spring. The number of power piston leaf spring fixing screws corresponds to the number of through holes. Each power piston leaf spring fixing screw passes through the through hole and is fixed on the first platform. 2 N threaded holes are evenly distributed on the first platform. Each power piston leaf spring fixing screw is connected to the corresponding threaded hole on the first platform. A power piston leaf spring adjusting rubber ring is provided between the power piston leaf spring and the power piston leaf spring fixing screw. Horizontally 2 nAdjusting threaded holes, the number of power piston plate spring adjusting screws corresponds to the number of adjusting threaded holes. Each power piston plate spring adjusting screw passes through the first support frame and is screwed into the adjusting threaded hole of the power piston plate spring. The power piston plate spring can be slightly moved by adjusting the power piston plate spring adjusting screw; 2 are evenly distributed on the side wall of the first support frame n threaded holes, and each power piston plate spring adjusting screw passes through the corresponding threaded hole on the side wall of the first support frame.

[0008] Furthermore, the gas distribution piston plate spring adjusting device includes a gas distribution piston plate spring adjusting rubber ring, a gas distribution piston plate spring adjusting screw, and a gas distribution piston plate spring fixing screw. 2 longitudinal N through holes are evenly distributed on the periphery of the gas distribution piston plate spring. The number of gas distribution piston plate spring fixing screws corresponds to the number of through holes. Each gas distribution piston plate spring fixing screw passes through the through hole and is fixed on the second platform. 2 are evenly distributed on the second platform N threaded holes, and each gas distribution piston plate spring fixing screw is connected to the corresponding threaded hole on the second platform. A gas distribution piston plate spring adjusting rubber ring is provided between the gas distribution piston plate spring and the gas distribution piston plate spring fixing screw; 2 transverse n adjusting threaded holes are evenly distributed on the circumferential end face of the gas distribution piston plate spring. The number of gas distribution piston plate spring adjusting screws corresponds to the number of adjusting threaded holes. Each gas distribution piston plate spring adjusting screw passes through the second support frame and is screwed into the adjusting threaded hole of the gas distribution piston plate spring. The gas distribution piston plate spring can be slightly moved by adjusting the gas distribution piston plate spring adjusting screw; 2 are evenly distributed on the side wall of the second support frame n threaded holes, and each gas distribution piston plate spring adjusting screw passes through the corresponding threaded hole on the side wall of the second support frame.

[0009] Furthermore, the N is an integer greater than or equal to 2, and the n is an integer greater than or equal to 2.

[0010] A debugging method for a free piston Stirling generator with a coaxial debugging device includes the following steps: Step S1: Adjust the N power piston plate spring fixing screws at intervals to a specific tightness; Step S2: Excite the mover of the first linear motor to make the power piston vibrate up and down; Step S3: Adjust the power piston plate spring adjusting screw to make the power piston plate spring move slightly laterally; Step S4: Use the remaining N power piston plate springs to completely fix the power piston plate spring; Step S5: Adjust the N gas distribution piston plate spring fixing screws at intervals to a specific tightness; Step S6: Actuate the mover of the second linear motor to vibrate the gas distribution piston up and down; Step S7: Adjust the spring adjusting screw of the gas distribution piston plate to cause a slight lateral movement of the spring of the gas distribution piston plate; Step S8: Use the remaining N gas distribution piston plate springs to completely fix the gas distribution piston plate spring.

[0011] Furthermore, the specific tightness in Step S1 means that when the power piston vibrates up and down, the spring of the power piston plate remains fixed, and when adjusting the spring adjusting screw of the power piston plate, the spring of the power piston plate can produce a lateral movement; the specific tightness in Step S5 means that when the gas distribution piston vibrates up and down, the spring of the gas distribution piston plate remains fixed, and when adjusting the spring adjusting screw of the gas distribution piston plate, the spring of the gas distribution piston plate can produce a lateral movement.

[0012] Furthermore, in Step S3, the specific method is as follows: First, adjust a set of spring adjusting screws of the power piston plate on the same axis. Push the spring of the power piston plate back and forth along the axis to drive the slight movement of the power piston. Observe the oscilloscope waveform during the adjustment process. When the distortion rate of the acceleration waveform of the power piston < 10%, adjust another set of spring adjusting screws of the power piston plate on the same axis. Push the spring of the power piston plate back and forth along the axis to cause the slight movement of the spring of the power piston plate. Observe the oscilloscope waveform during the adjustment process. When the distortion rate of the acceleration waveform of the power piston < 1%, stop the adjustment.

[0013] Furthermore, in Step S6, the specific method is as follows: First, adjust a set of spring adjusting screws of the gas distribution piston plate on the same axis. Push the spring of the gas distribution piston plate back and forth along the axis to drive the slight movement of the gas distribution piston. Observe the oscilloscope waveform during the adjustment process. When the distortion rate of the acceleration waveform of the gas distribution piston < 10%, adjust another set of spring adjusting screws of the gas distribution piston plate on the same axis. Push the spring of the gas distribution piston plate back and forth along the axis to cause the slight movement of the spring of the gas distribution piston plate. Observe the oscilloscope waveform during the adjustment process. When the distortion rate of the acceleration waveform of the gas distribution piston < 1%, stop the adjustment.

[0014] Furthermore, the complete fixation in Step S4 means that when adjusting the spring adjusting screw of the power piston plate, the spring of the power piston plate cannot produce a lateral movement; the complete fixation in Step S8 means that when adjusting the spring adjusting screw of the gas distribution piston plate, the spring of the gas distribution piston plate cannot produce a lateral movement.

[0015] Compared with the prior art, the advantages of the present invention are as follows: In view of the problems in the existing assembly and commissioning process of Stirling generators, such as relying on high-precision machining, insufficient adjustment flexibility, and lack of real-time calibration means, the present invention proposes a coaxial commissioning device and a commissioning method for a free-piston Stirling generator. Through the leaf spring adjustment device (the power piston leaf spring adjustment device and the gas distribution piston leaf spring adjustment device), the dynamic balance of lateral displacement compensation and vertical direction rigid constraint during the assembly process is realized, replacing the traditional fixed limit structure. Through the pre-tightening force balance design of the leaf spring adjustment device, combined with double electromagnetic drive and real-time monitoring of the acceleration waveform, the axis deviation between the piston and the cylinder can be dynamically compensated during the commissioning process, realizing frictionless coaxial commissioning. This method significantly reduces the dependence on the machining accuracy of parts, improves the commissioning efficiency, and at the same time, through the elastic constraint and real-time feedback mechanism, ensures the stability and long life of the generator during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a schematic structural diagram of a free-piston Stirling generator with a coaxial commissioning device according to an embodiment of the present invention.

[0017] Figure 2 is Figure 1 a schematic structural diagram of the first support frame of the embodiment shown.

[0018] Figure 3 is Figure 1 a schematic structural diagram of the second support frame of the embodiment shown.

[0019] Figure 4 is Figure 1 a partial enlarged view of A of the embodiment shown.

[0020] Figure 5 is Figure 1 a partial enlarged view of B of the embodiment shown.

[0021] Figure 6 is Figure 1 a schematic diagram of adjusting the gas distribution piston leaf spring adjustment screw of the embodiment shown.

[0022] Figure 7 is the waveform of the gas distribution piston acceleration sensor before commissioning in the commissioning method of the free-piston Stirling generator with a coaxial commissioning device according to an embodiment of the present invention.

[0023] Figure 8 is the waveform of the gas distribution piston acceleration sensor after commissioning in the commissioning method of the free-piston Stirling generator with a coaxial commissioning device according to an embodiment of the present invention.

[0024] 1 - Gas distribution piston, 2 - Gas distribution piston rod, 3 - Power piston, 4 - Cylinder, 5 - First linear motor stator, 6 - First linear motor mover, 7 - Gas distribution piston leaf spring, 8 - Power piston leaf spring, 9 - Power piston acceleration sensor, 10 - Gas distribution piston acceleration sensor, 11 - First support frame, 12 - Gas distribution piston leaf spring adjustment screw, 13 - Second linear motor stator, 14 - Second linear motor mover, 15 - Second support frame, 16 - Gas distribution piston leaf spring fixing screw, 17 - Gas distribution piston leaf spring adjustment rubber ring, 18 - Power piston leaf spring adjustment screw, 19 - Power piston leaf spring fixing screw, 20 - Power piston leaf spring adjustment rubber ring, 21 - First platform, 22 - Second platform. Detailed implementation mode

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Refer to Figure 1 , the free piston Stirling generator with a coaxial debugging device in this embodiment includes a Stirling generator body and a coaxial debugging device. The Stirling generator body includes a gas distribution piston 1, a power piston 3, a cylinder 4, a gas distribution piston leaf spring 7, a power piston leaf spring 8, a first linear motor, and a second linear motor. The first linear motor includes a first linear motor stator 5 and a first linear motor mover 6, and the second linear motor includes a second linear motor stator 13 and a second linear motor mover 14. The coaxial debugging device includes a first support frame 11, a second support frame 15, a power piston acceleration sensor 9, a gas distribution piston acceleration sensor 10, a power piston leaf spring adjustment device, a gas distribution piston leaf spring adjustment device, and an oscilloscope. The power piston acceleration sensor 9 and the gas distribution piston acceleration sensor 10 are connected to the oscilloscope.

[0027] The first support frame 11 covers the Stirling generator body, the second support frame 15 covers the top of the first support frame 11, the cylinder 4, the first linear motor stator 5 are fixed to the first support frame 11, the gas distribution piston 1 is placed at the bottom of the cylinder 4, the power piston 3 and the first linear motor mover 6 are fixed on the power piston leaf spring 8, the power piston leaf spring 8 is horizontally fixed to the first support frame 11 by screws, the gas distribution piston leaf spring 7 is horizontally fixed to the second support frame 15 by screws, the gas distribution piston rod 2 passes through the power piston 3, the power piston leaf spring 8, and the gas distribution piston leaf spring 7. One end of the gas distribution piston rod 2 is connected to the gas distribution piston 1, and the other end is connected to the second linear motor mover 14. The second linear motor stator 13 is nested on the second linear motor mover 14 and is fixed to the second support frame 15 by screws. The power piston acceleration sensor 9 is fixed near the center of the power piston leaf spring, and the gas distribution piston acceleration sensor 10 is fixed near the center of the gas distribution piston leaf spring 7.

[0028] Refer toFigure 2 , Figure 3 , the first support frame 11 is a hollow cylindrical structure with openings at both ends. The bottom of the first support frame 11 expands outwards in a circle and is connected to the cylinder 4. The middle of the first support frame 11 expands outwards in a circle to form the first platform 21, and the top of the first support frame 11 expands outwards in a circle to form the second platform 22. The power piston plate spring 8 is located on the first platform 21, and the air distribution piston plate spring 7 is located on the second platform 22. The second support frame 15 is a cover structure with an opening at one end, and the opening end of the second support frame 15 is connected to the second platform 22.

[0029] Refer to Figure 5 , the power piston plate spring adjusting device includes a power piston plate spring adjusting rubber ring 20, a power piston plate spring adjusting screw 18, and a power piston plate spring fixing screw 19. Twelve longitudinal through holes are evenly distributed on the circumferential edge of the power piston plate spring 8. The number of power piston plate spring fixing screws 19 corresponds to the number of through holes. Each power piston plate spring fixing screw 19 passes through the through hole and is fixed on the first platform 21. Twelve threaded holes are evenly distributed on the first platform 21. Each power piston plate spring fixing screw 19 is connected to the corresponding threaded hole on the first platform 21. A power piston plate spring adjusting rubber ring 20 is provided between the power piston plate spring 8 and the power piston plate spring fixing screw 19. Four transverse adjusting threaded holes are evenly distributed on the circumferential end face of the power piston plate spring 8. The number of power piston plate spring adjusting screws 18 corresponds to the number of adjusting threaded holes. Each power piston plate spring adjusting screw 18 passes through the first support frame 11 and is screwed into the adjusting threaded hole of the power piston plate spring 8. The power piston plate spring 8 can be slightly moved by adjusting the power piston plate spring adjusting screw 18. Four threaded holes are evenly distributed on the side wall of the first support frame 11. Each power piston plate spring adjusting screw 18 passes through the corresponding threaded hole on the side wall of the first support frame 11. The threaded holes on the side wall of the first support frame 11 can be used to place the power piston plate spring adjusting screw 18.

[0030] Refer to Figure 4, the valve piston plate spring adjusting device includes a valve piston plate spring adjusting rubber ring 17, a valve piston plate spring adjusting screw 12, and a valve piston plate spring fixing screw 16. Twelve longitudinal through holes are evenly distributed on the peripheral edge of the valve piston plate spring 7. The number of valve piston plate spring fixing screws 16 corresponds to the number of through holes. Each valve piston plate spring fixing screw 16 passes through the through hole and is fixed on the second platform 22. Twelve threaded holes are evenly distributed on the second platform 22. Each valve piston plate spring fixing screw 16 is connected to the corresponding threaded hole on the second platform 22. An adjusting rubber ring 17 is provided between the valve piston plate spring 7 and the valve piston plate spring fixing screw 16. Four transverse adjusting threaded holes are evenly distributed on the circumferential end face of the valve piston plate spring 7. The number of valve piston plate spring adjusting screws 12 corresponds to the number of adjusting threaded holes. Each valve piston plate spring adjusting screw 12 passes through the second support frame 15 and is screwed into the adjusting threaded hole of the valve piston plate spring 7. The valve piston plate spring 7 can be slightly moved by adjusting the valve piston plate spring adjusting screw 12. Four threaded holes are evenly distributed on the side wall of the second support frame 15. Each valve piston plate spring adjusting screw 12 passes through the corresponding threaded hole on the side wall of the second support frame 15. The threaded holes on the side wall of the second support frame 15 can be used to place the valve piston plate spring adjusting screw 12.

[0031] The debugging method of the free piston Stirling generator in this embodiment includes the following steps: Step S1: Adjust six power piston plate spring fixing screws at intervals to a specific tightness. The specific tightness means that when the power piston 3 vibrates up and down, the power piston plate spring 8 remains fixed, and when adjusting the power piston plate spring adjusting screw, the power piston plate spring 8 can move horizontally. In this embodiment, the specific tightness is specifically reflected as: adjusting six power piston plate spring fixing screws at intervals, and the height of the power piston plate spring adjusting rubber ring under extrusion becomes half of the initial value.

[0032] Step S2: Use the alternating current generated by the AC power supply to excite the first linear motor mover 6 to make the power piston 3 vibrate up and down; Step S3: Adjust the power piston plate spring adjusting screw to make the power piston plate spring 8 move slightly horizontally. The specific method is: first adjust a set of power piston plate spring adjusting screws on the same axis. Push the power piston plate spring 8 back and forth in the axial direction to drive the power piston 3 to move slightly. Observe the oscilloscope waveform during the adjustment process. When the distortion rate (THD) of the power piston acceleration waveform < 10%, adjust another set of power piston plate spring adjusting screws on the same axis. Push the power piston plate spring 8 back and forth in the axial direction to make the power piston plate spring 8 move slightly. Observe the oscilloscope waveform during the adjustment process. When the distortion rate (THD) of the power piston acceleration waveform < 1%, stop the adjustment; Step S4: Use the remaining 6 power piston plate springs to completely fix the power piston plate spring 8. By "completely fix", it means that when adjusting the power piston plate spring adjusting screw, the power piston plate spring 8 cannot move laterally. Step S5: Adjust the 6 spaced valve piston plate spring fixing screws to a specific tightness. By "specific tightness", it means that when the valve piston 1 vibrates up and down, the valve piston plate spring 7 remains fixed, and when adjusting the valve piston plate spring adjusting screw, the valve piston plate spring 7 can move laterally. In this embodiment, the specific tightness is specifically embodied as follows: Adjust the 6 spaced valve piston plate spring fixing screws, and the height of the valve piston plate spring adjusting rubber ring being squeezed becomes half of the initial value.

[0033] Step S6: Use the alternating current generated by the AC power supply to excite the second linear motor mover 14 to make the valve piston 1 vibrate up and down. Step S7: Adjust the valve piston plate spring adjusting screw to make the valve piston plate spring 7 move slightly laterally; refer to Figure 6 , Figure 6 in which the arrow indicates the slight movement. The specific method is as follows: First, adjust a set of valve piston plate spring adjusting screws on the same axis. Push the valve piston plate spring 7 back and forth in the axial direction to drive the valve piston 1 to move slightly. Observe the oscilloscope waveform during the adjustment process. When the distortion rate (THD) of the valve piston acceleration waveform < 10%, adjust another set of valve piston plate spring adjusting screws on the same axis. Push the valve piston plate spring 7 back and forth in the axial direction to make the valve piston plate spring 7 move slightly. Observe the oscilloscope waveform during the adjustment process. When the distortion rate (THD) of the valve piston acceleration waveform < 1%, stop the adjustment. Step S8: Use the remaining 6 valve piston plate springs to completely fix the valve piston plate spring 7. By "completely fix", it means that when adjusting the valve piston plate spring adjusting screw, the valve piston plate spring 7 cannot move laterally.

[0034] Before debugging, the waveform of the valve piston acceleration sensor of the free piston Stirling generator is as shown in Figure 7 ; after debugging, the waveform of the valve piston acceleration sensor of the free piston Stirling generator is as shown in Figure 8 . At the specific tightness, the leaf spring fixing screw provides sufficient pre-tightening force to fix the vertical direction, so that the leaf spring remains fixed when the piston vibrates up and down; and due to the existence of the rubber ring, it provides compression resistance (enhanced constraint) in the vertical direction, while allowing shear deformation in the lateral direction. Its elastic characteristics can absorb vibration and reduce the frictional resistance of lateral movement, further promoting the lateral freedom. Therefore, when adjusting the leaf spring adjusting screw, the leaf spring adjusting screw makes a small movement, enabling the leaf spring to perform high-precision lateral movement.

[0035] Figure 1 The figure shows the placement state during the debugging of the free-piston Stirling generator. When in use, Figure 1 invert the shown placement state. After the debugging of the free-piston Stirling generator is completed, disconnect the oscilloscope, remove the second bracket 15 and the second linear motor, install the outer shell, and use the free-piston Stirling generator normally.

[0036] Through the cooperation of the leaf spring adjusting screw, the leaf spring fixing screw and the rubber ring, the present invention realizes dynamic fine adjustment, without relying on high-precision machining or complex tooling, significantly reducing the assembly difficulty and cost. Through the lateral fine adjustment of the leaf spring adjusting screw and the real-time monitoring of the acceleration sensor waveform, the high-precision coaxial assembly of the power piston and the gas distribution piston is realized, avoiding the errors of traditional manual calibration and ensuring frictionless operation after assembly. Based on the real-time feedback mechanism of the acceleration waveform characteristics, the assembly time of the Stirling generator is greatly shortened, and the assembly consistency is significantly improved. The closed-loop control with dual linear motor drive and dual acceleration sensor real-time feedback is adopted to replace the single sensor or off-line detection method, significantly improving the assembly accuracy and efficiency.

[0037] Those skilled in the art can make various modifications and variations to the present invention. If these modifications and variations are within the scope of the claims of the present invention and their equivalent technologies, then these modifications and variations are also within the protection scope of the present invention.

[0038] The content not described in detail in the specification is the prior art well known to those skilled in the art.

Claims

1. A free piston Stirling generator with a coaxial debugging device, characterized in that: It includes a Stirling generator body and a coaxial debugging device. The Stirling generator body includes a gas distribution piston, a power piston, a cylinder, a gas distribution piston leaf spring, a power piston leaf spring, a first linear motor, and a second linear motor. The first linear motor includes a first linear motor stator and a first linear motor mover. The second linear motor includes a second linear motor stator and a second linear motor mover. The coaxial debugging device includes a first support frame, a second support frame, a power piston acceleration sensor, a gas distribution piston acceleration sensor, a power piston leaf spring adjusting device, a gas distribution piston leaf spring adjusting device, and an oscilloscope. The power piston acceleration sensor and the gas distribution piston acceleration sensor are connected to the oscilloscope. The first support frame covers the Stirling generator body. The second support frame covers the top of the first support frame. The cylinder and the first linear motor stator are fixed to the first support frame. The gas distribution piston is placed at the bottom of the cylinder. The power piston and the first linear motor mover are fixed on the power piston leaf spring. The power piston leaf spring is horizontally fixed on the first support frame. The gas distribution piston leaf spring is horizontally fixed on the second support frame. The gas distribution piston rod passes through the power piston, the power piston leaf spring, and the gas distribution piston leaf spring. One end of the gas distribution piston rod is connected to the gas distribution piston, and the other end is connected to the second linear motor mover. The second linear motor stator is nested on the second linear motor mover and fixed to the second support frame. The power piston acceleration sensor is fixed on the power piston leaf spring. The gas distribution piston acceleration sensor is fixed on the gas distribution piston leaf spring.

2. The free-piston Stirling generator with a coaxial debugging device according to claim 1, characterized in that: The first support frame is a hollow cylindrical structure with openings at both ends. The bottom of the first support frame expands outwards in a circle and is connected to the cylinder. The middle of the first support frame expands outwards in a circle to form a first platform. The top of the first support frame expands outwards in a circle to form a second platform. The power piston leaf spring is located on the first platform. The gas distribution piston leaf spring is located on the second platform. The second support frame is a cover structure with an opening at one end. The opening end of the second support frame is connected to the second platform.

3. The free piston Stirling generator with a coaxial debugging device according to claim 2, characterized in that: The power piston plate spring adjusting device includes a power piston plate spring adjusting rubber ring, a power piston plate spring adjusting screw, and a power piston plate spring fixing screw. Longitudinal 2 N through holes are evenly distributed on the circumferential edge of the power piston plate spring. The number of power piston plate spring fixing screws corresponds to the number of through holes. Each power piston plate spring fixing screw passes through the through hole and is fixed on the first platform. 2 N threaded holes are evenly distributed on the first platform. Each power piston plate spring fixing screw is connected to the corresponding threaded hole on the first platform. A power piston plate spring adjusting rubber ring is provided between the power piston plate spring and the power piston plate spring fixing screw; 2 n transverse adjusting threaded holes are evenly distributed on the circumferential end face of the power piston plate spring. The number of power piston plate spring adjusting screws corresponds to the number of adjusting threaded holes. Each power piston plate spring adjusting screw passes through the first support frame and is screwed into the adjusting threaded hole of the power piston plate spring. The power piston plate spring can be finely moved by adjusting the power piston plate spring adjusting screw; 2 n threaded holes are evenly distributed on the side wall of the first support frame. Each power piston plate spring adjusting screw passes through the corresponding threaded hole on the side wall of the first support frame.

4. The free piston Stirling generator with a coaxial debugging device according to claim 3, characterized in that: The gas distribution piston plate spring adjusting device includes a gas distribution piston plate spring adjusting rubber ring, a gas distribution piston plate spring adjusting screw, and a gas distribution piston plate spring fixing screw. Longitudinal 2 N through holes are evenly distributed on the circumferential edge of the gas distribution piston plate spring. The number of gas distribution piston plate spring fixing screws corresponds to the number of through holes. Each gas distribution piston plate spring fixing screw passes through the through hole and is fixed on the second platform. 2 N threaded holes are evenly distributed on the second platform. Each gas distribution piston plate spring fixing screw is connected to the corresponding threaded hole on the second platform. A gas distribution piston plate spring adjusting rubber ring is provided between the gas distribution piston plate spring and the gas distribution piston plate spring fixing screw; 2 n transverse adjusting threaded holes are evenly distributed on the circumferential end face of the gas distribution piston plate spring. The number of gas distribution piston plate spring adjusting screws corresponds to the number of adjusting threaded holes. Each gas distribution piston plate spring adjusting screw passes through the second support frame and is screwed into the adjusting threaded hole of the gas distribution piston plate spring. The gas distribution piston plate spring can be slightly moved by adjusting the gas distribution piston plate spring adjusting screw; 2 n threaded holes are evenly distributed on the side wall of the second support frame. Each gas distribution piston plate spring adjusting screw passes through the corresponding threaded hole on the side wall of the second support frame.

5. The free piston Stirling generator with a coaxial debugging device according to claim 4, characterized in that: The N is an integer greater than or equal to 2, and the n is an integer greater than or equal to 2.

6. A debugging method for a free-piston Stirling generator with a coaxial debugging device, which is applied to the free-piston Stirling generator with a coaxial debugging device described in claim 5, and is characterized in that: It includes the following steps: Step S1: Adjust the N power piston plate spring fixing screws to a specific tightness; Step S2: Excite the first linear motor mover to make the power piston vibrate up and down. Step S3: Adjust the power piston leaf spring adjustment screw to make the power piston leaf spring produce a slight lateral movement. Step S4: Use the remaining N power piston plate springs to completely fix the power piston plate springs; Step S5: Adjust the N valve piston plate spring fixing screws to a specific tightness; Step S6: Excite the second linear motor mover to make the gas distribution piston vibrate up and down. Step S7: Adjust the gas distribution piston leaf spring adjustment screw to make the gas distribution piston leaf spring produce a slight lateral movement. Step S8: Use the remaining N valve piston plate springs to completely fix the valve piston plate springs.

7. The debugging method of the free piston Stirling generator with a coaxial debugging device as described in claim 6, characterized in that: the specific tightness in step S1 means that when the power piston vibrates up and down, the power piston leaf spring remains fixed, and when adjusting the power piston leaf spring adjustment screw, the power piston leaf spring can produce a lateral movement; the specific tightness in step S5 means that when the gas distribution piston vibrates up and down, the gas distribution piston leaf spring remains fixed, and when adjusting the gas distribution piston leaf spring adjustment screw, the gas distribution piston leaf spring can produce a lateral movement.

8. The debugging method of the free-piston Stirling generator with a coaxial debugging device according to claim 6, characterized in that: In step S3, the specific method is as follows: First, adjust a set of power piston plate spring adjusting screws on the same axis. Push the power piston plate spring back and forth along this axis to cause slight movement of the power piston. Observe the oscilloscope waveform during the adjustment process. When the distortion rate of the power piston acceleration waveform < 10%, adjust another set of power piston plate spring adjusting screws on the same axis. Push the power piston plate spring back and forth along this axis to cause slight movement of the power piston plate spring. Observe the oscilloscope waveform during the adjustment process. When the distortion rate of the power piston acceleration waveform < 1%, stop the adjustment.

9. The debugging method of the free-piston Stirling generator with a coaxial debugging device according to claim 6, characterized in that: In step S6, the specific method is as follows: First, adjust a set of valve piston plate spring adjusting screws on the same axis. Push the valve piston plate spring back and forth along this axis to cause slight movement of the valve piston. Observe the oscilloscope waveform during the adjustment process. When the distortion rate of the valve piston acceleration waveform < 10%, adjust another set of valve piston plate spring adjusting screws on the same axis. Push the valve piston plate spring back and forth along this axis to cause slight movement of the valve piston plate spring. Observe the oscilloscope waveform during the adjustment process. When the distortion rate of the valve piston acceleration waveform < 1%, stop the adjustment.

10. The debugging method of the free-piston Stirling generator with a coaxial debugging device according to claim 6, characterized in that: The complete fixation in step S4 means that when adjusting the power piston plate spring adjusting screws, the power piston plate spring cannot move laterally; the complete fixation in step S8 means that when adjusting the valve piston plate spring adjusting screws, the valve piston plate spring cannot move laterally.

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