Stirling generator static pressure gas bearing with online threshold adjustment and adjustment method thereof

Abstract

A static pressure gas bearing of a Stirling generator with online threshold adjustment and an adjustment method thereof, the bearing comprises a static pressure gas bearing cylinder, a static pressure gas bearing round cover, a one-way valve, and a stepper motor, wherein the one-way valve and the stepper motor are arranged in the static pressure gas bearing cylinder, the stepper motor is connected to the one-way valve, and the static pressure gas bearing round cover is located at the bottom of the static pressure gas bearing cylinder; a piston rod through hole is opened in the center of the gas bearing cylinder, a pressure storage chamber around the piston rod through hole is arranged in the gas bearing cylinder, a throttle hole is arranged on the wall of the gas bearing cylinder, the throttle hole is connected to the pressure storage chamber, and the stepper motor and the one-way valve are arranged in the pressure storage chamber. Also included is a static pressure gas bearing adjustment method of a Stirling generator with online threshold adjustment. The present invention can realize online adjustment of the one-way valve threshold, without repeatedly disassembling and assembling the Stirling generator, increasing the convenience of adjusting the one-way valve opening threshold, improving the adjustment accuracy of the one-way valve threshold, and reducing the debugging time of the one-way valve threshold.

Description

Technical Field

[0001] The invention relates to a static pressure gas bearing of a Stirling generator, and in particular to a static pressure gas bearing of a Stirling generator with online threshold adjustment and an adjustment method thereof. Background Art

[0002] The hydrostatic gas bearing in the Stirling generator is a high-performance bearing technology that uses compressed gas to form a supporting force. Compared with traditional mechanical bearings, the hydrostatic gas bearing has the advantages of non-contact, no lubrication, high precision and low vibration, which is very suitable for the high-efficiency energy conversion needs of the Stirling generator. Stirling generators usually work under high temperature and high pressure conditions. The operating stability of its key components is crucial to the overall efficiency and life. The non-contact design of the hydrostatic gas bearing not only reduces friction loss, but also significantly improves the reliability and life of the system. The hydrostatic gas bearing technology is gradually becoming the core solution for Stirling generators to improve performance and adapt to harsh working conditions.

[0003] The structure of the static pressure gas bearing in the Stirling generator mainly includes a one-way valve and a throttle hole. The one-way valve is used to intercept the high-pressure gas in the compression chamber of the Stirling generator and enter the pressure storage chamber in the gas bearing. The high-pressure gas in the pressure storage chamber is blown into the gap between the outer surface of the static pressure gas bearing and the inner wall of the cylinder through the throttle hole to form an air film to achieve a gas lubrication effect. Among them, the threshold of the opening of the one-way valve has an important influence on the performance of the static pressure gas bearing and the useless volume of the static pressure gas bearing on the Stirling generator. Adjusting the threshold of the one-way valve is a challenge in actual design. The traditional adjustment method repeatedly disassembles and assembles the Stirling generator, and can only reassemble the Stirling generator by setting a threshold each time. Affected by multiple factors such as pressure waves, damping, pressure storage chamber size, coaxial assembly, and processing errors in the Stirling generator, it takes multiple repeated adjustments to get a suitable threshold. The adjustment process is complicated and cumbersome, the adjustment accuracy is low, and it consumes a lot of manpower and material costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a Stirling generator static pressure gas bearing with online threshold adjustment and an adjustment method thereof, which can realize online adjustment of the one-way valve threshold without the need for repeated disassembly and assembly of the Stirling generator, effectively increasing the convenience of adjusting the opening threshold of the static pressure gas bearing one-way valve, improving the adjustment accuracy of the one-way valve threshold, effectively reducing the debugging time of the one-way valve threshold, and reducing labor and material costs.

[0005] The technical solution adopted by the present invention to solve its technical problems is a Stirling generator static pressure gas bearing with online threshold adjustment, including a static pressure gas bearing cylinder, a static pressure gas bearing round cover, a one-way valve and a stepper motor, the one-way valve and the stepper motor are arranged in the static pressure gas bearing cylinder, the stepper motor is connected to the one-way valve, and the static pressure gas bearing round cover is located at the bottom of the static pressure gas bearing cylinder; a piston rod through hole is opened in the center of the gas bearing cylinder, a pressure storage chamber is arranged in the gas bearing cylinder around the piston rod through hole, a throttling hole is arranged on the wall of the gas bearing cylinder, the throttling hole is connected to the pressure storage chamber, and the stepper motor and the one-way valve are arranged in the pressure storage chamber.

[0006] Furthermore, the one-way valve comprises a valve body, a valve core and a valve cover. The valve body comprises a fixed screw and a valve barrel. The interior of the valve barrel is a hollow valve cavity. The valve barrel is provided with an exhaust hole. The fixed screw is a hollow structure. The fixed screw is connected to the bottom of the valve barrel. The cavity of the fixed screw is communicated with the valve cavity. An air inlet hole is provided on the static pressure gas bearing round cover. The air inlet hole is communicated with the cavity of the fixed screw. The valve core is located at the bottom of the valve barrel. A spring is provided in the valve cavity. The valve cover is located at the upper part of the valve cavity. The valve cover is connected to the valve cavity and can rotate in the valve cavity. One end of the spring contacts the valve core and the other end contacts the valve cover. A spring limiting groove is provided at the bottom of the valve cover. One end of the spring is placed in the spring limiting groove. The driving screw of the stepping motor passes through the valve cover and extends into the spring. The spring can be compressed by the stepping motor to make the valve core press against the end of the cavity of the fixed screw, thereby cutting off the air flow path between the cavity of the fixed screw and the valve cavity.

[0007] A method for adjusting a static pressure gas bearing of a Stirling generator with online threshold adjustment comprises the following steps:

[0008] Step S1: measuring the displacement of the power piston of the Stirling generator, the air pressure amplitude of the compression chamber of the Stirling generator, and the output power of the Stirling generator;

[0009] Step S2: for the working condition where the temperature and load at the hot end of the Stirling generator are constant, the optimal opening threshold of the one-way valve is obtained according to the displacement of the power piston and the output power of the Stirling generator; for the working condition where the temperature at the hot end of the Stirling generator changes and the load fluctuates, the optimal opening threshold of the one-way valve is obtained according to the air pressure amplitude of the compression chamber of the Stirling generator and the output power of the Stirling generator;

[0010] Step S3: The host computer sends a control signal according to the optimal opening threshold of the one-way valve to drive the stepper motor to move;

[0011] Step S4: The stepper motor rotates counterclockwise or clockwise, and the transmission screw drives the rotatable valve cover to move the controlled step amount, thereby adjusting the deformation of the spring in the one-way valve. The spring contacts the valve core. When the gas pressure in the compression chamber of the Stirling generator is greater than the spring force, the valve core is lifted and the one-way valve opens. When the gas pressure in the compression chamber of the Stirling generator is less than the spring force, the valve core presses against the valve body and the one-way valve closes.

[0012] Further, in step S1, the displacement of the power piston of the Stirling generator is collected by a displacement sensor; the air pressure amplitude of the compression chamber of the Stirling generator is collected by a pressure sensor; and the output power of the Stirling generator is collected by a programmable power supply.

[0013] Further, in step S2, for the working condition where the hot end temperature and load of the Stirling generator are constant, the one-way valve opening threshold under the conditions that the Stirling generator can start normally, the displacement sensor waveform is not distorted, the displacement sensor waveform is stable, and the Stirling generator output power is maximum is the optimal opening threshold.

[0014] Further, in step S2, for the working condition where the temperature and load of the hot end of the Stirling generator are constant, the start threshold is first obtained under the condition that the Stirling generator can start normally, the displacement sensor waveform is not distorted, and the displacement sensor waveform is stable. ,by is the optimal opening threshold interval; then the optimal opening threshold interval The optimal threshold value is the threshold value when the output power of the Trin generator is the maximum. .

[0015] Furthermore, the displacement sensor waveform refers to a curve of the displacement of the power piston measured by the displacement sensor changing with time.

[0016] Furthermore, the stable waveform of the displacement sensor refers to the stable displacement amplitude of the power piston of the Stirling generator.

[0017] Further, in step S2, for the working conditions of temperature change and load fluctuation at the hot end of the Stirling generator, the output power of multiple groups of Stirling generators and the corresponding air pressure amplitude of the compression chamber of the Stirling generator and the corresponding one-way valve opening threshold are measured, and based on the multiple groups of measured data, a change curve of the one-way valve opening threshold with respect to the air pressure amplitude of the compression chamber of the Stirling generator and the output frequency of the Stirling generator is fitted, and the optimal opening threshold of the one-way valve is obtained based on the change curve.

[0018] Further, in step S4, the deformation of the spring and the opening threshold of the one-way valve satisfy the following formula:

[0019] in, is the opening threshold of the one-way valve, i.e. the opening pressure. is the area of ​​the compression chamber air inlet, is the elastic constant of the spring;

[0020] The relationship between the control quantity of a given stepper motor and the spring deformation satisfies the following formula:

[0021] in, is the number of input pulses, is the step size per rotation, is the basic step angle.

[0022] Compared with the prior art, the advantages of the present invention are as follows:

[0023] The present invention can realize online adjustment of the one-way valve threshold value without repeatedly disassembling and assembling the Stirling generator, effectively increases the convenience of adjusting the opening threshold value of the static pressure gas bearing one-way valve, improves the adjustment accuracy of the one-way valve threshold value, effectively reduces the debugging time of the one-way valve threshold value, and reduces labor and material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of a static pressure gas bearing of a Stirling generator (the static pressure gas bearing cylinder faces forward) according to an embodiment of the present invention.

[0025] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of a static pressure gas bearing of a Stirling generator (with the static pressure gas bearing circular cover facing forward) in the illustrated embodiment.

[0026] Figure 3 yes Figure 1 A schematic side view of a static pressure gas bearing for a Stirling generator of the illustrated embodiment.

[0027] Figure 4 yes Figure 1 A perspective cross-sectional view of a Stirling generator static pressure gas bearing of the illustrated embodiment.

[0028] Figure 5 yes Figure 1 A plan cross-sectional view of a Stirling generator static pressure gas bearing of the illustrated embodiment.

[0029] Figure 6 yes Figure 1 A schematic structural diagram of a one-way valve of the illustrated embodiment.

[0030] Figure 7 It is a structural schematic diagram of a static pressure gas bearing adjustment system for a Stirling generator according to an embodiment of the present invention.

[0031] Figure 8 It is a flow chart of obtaining the optimal opening threshold of the one-way valve under the condition that the hot end temperature and load of the Stirling generator of the embodiment of the invention are constant.

[0032] 1—static pressure gas bearing cylinder, 2—static pressure gas bearing round cover, 3—check valve, 4—stepping motor, 5—pressure sensor, 6—displacement sensor, 1-1—piston rod through hole, 1-2—pressure storage chamber, 1-3—throttle hole, 2-1—air inlet hole, 3-1—valve body, 3-2—valve core, 3-3—valve cover, 3-1-1—fixed screw, 3-1-2—valve cylinder, 3-1-3—spring, 3-1-4—exhaust hole, 4-1—transmission screw. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figures 1 to 5 The static pressure gas bearing of the Stirling generator with online threshold adjustment in this embodiment includes a static pressure gas bearing cylinder 1, a static pressure gas bearing round cover 2, a one-way valve 3, and a stepper motor 4. The one-way valve 3 and the stepper motor 4 are arranged in the static pressure gas bearing cylinder 1, the stepper motor 4 is connected to the one-way valve 3, and the static pressure gas bearing round cover 2 is located at the bottom of the static pressure gas bearing cylinder 1.

[0035] A piston rod through hole 1-1 is opened in the center of the gas bearing cylinder 1, and a pressure storage chamber 1-2 is arranged around the piston rod through hole in the gas bearing cylinder 1. A throttle hole 1-3 is arranged on the wall of the gas bearing cylinder, and the throttle hole 1-3 is connected with the pressure storage chamber 1-2. A stepper motor 4 and a one-way valve 3 are arranged in the pressure storage chamber 1-2.

[0036] Reference Figure 6 The one-way valve 3 includes a valve body 3-1, a valve core 3-2, and a valve cover 3-3. The valve body 3-1 includes a fixed screw 3-1-1 and a valve cylinder 3-1-2. The interior of the valve cylinder 3-1-2 is a hollow valve cavity. The valve cylinder 3-1-2 is provided with an exhaust hole 3-1-3. The fixed screw 3-1-1 is a hollow structure. The fixed screw is connected to the bottom of the valve cylinder 3-1-2. The cavity of the fixed screw 3-1-1 is connected to the valve cavity. The static pressure gas bearing round cover 2 is provided with an air inlet 2-1. The air inlet 2-1 is connected to the cavity of the fixed screw 3-1-1. The valve core 3-2 is located at the bottom of the valve cylinder 3-1-2; a spring 3-1-3 is arranged in the valve cavity, a valve cover 3-3 is located at the upper part of the valve cavity, the valve cover 3-3 is threadedly connected to the valve cavity and can rotate in the valve cavity, one end of the spring 3-1-3 contacts the valve core 3-2, and the other end contacts the valve cover 3-3, a spring limiting groove is arranged at the bottom of the valve cover 3-3, one end of the spring 3-1-3 is placed in the spring limiting groove, a driving screw 4-1 of the stepper motor 4 passes through the valve cover 3-3 and extends into the spring 3-1-3, the spring 3-1-3 can be compressed by the stepper motor 4 to make the valve core 3-2 press against the end of the fixed screw 3-1-1 cavity, thereby cutting off the air flow path between the fixed screw 3-1-1 cavity and the valve cavity.

[0037] Reference Figure 7The static pressure gas bearing adjustment system of the Stirling generator with online threshold adjustment in this embodiment includes a pressure sensor 5, a displacement sensor 6, a stepper motor driver, a first data collector, a second data collector, a host computer, a USB to serial port, and a programmable power supply. The pressure sensor 5 is connected to the first data collector, the first data collector is connected to the host computer, the displacement sensor 6 is connected to the second data collector, the second data collector is connected to the host computer, the host computer is connected to the USB to serial port, the USB to serial port is connected to the stepper motor driver, the stepper motor driver is connected to the stepper motor, the programmable power supply is connected to the Stirling generator, the pressure sensor 5 is used to collect the gas pressure of the compression chamber of the Stirling generator, the displacement sensor 6 is used to collect the displacement of the power piston of the Stirling generator, and the programmable power supply is used to collect the output voltage of the Stirling generator.

[0038] The method for adjusting the static pressure gas bearing of a Stirling generator with online threshold adjustment in this embodiment comprises the following steps:

[0039] Step S1: measuring the displacement of the power piston of the Stirling generator, the air pressure amplitude of the compression chamber of the Stirling generator, and the output power of the Stirling generator;

[0040] Step S2: for the working condition where the temperature and load at the hot end of the Stirling generator are constant, the optimal opening threshold of the one-way valve is obtained according to the displacement of the power piston and the output power of the Stirling generator; for the working condition where the temperature at the hot end of the Stirling generator changes and the load fluctuates, the optimal opening threshold of the one-way valve is obtained according to the air pressure amplitude of the compression chamber of the Stirling generator and the output power of the Stirling generator;

[0041] For the working condition of constant temperature and load at the hot end of the Stirling generator, the optimal opening threshold is the one-way valve opening threshold under the condition that the Stirling generator can start normally, the displacement sensor waveform is not distorted, the displacement sensor waveform is stable, and the output power of the Stirling generator is maximum. The displacement sensor waveform refers to the curve of the power piston displacement measured by the displacement sensor over time, and the stable displacement sensor waveform refers to the stable displacement amplitude of the power piston of the Stirling generator.

[0042] First, the start threshold is obtained under the condition that the Stirling generator can start normally, the displacement sensor waveform is not distorted, and the displacement sensor waveform is stable. ,by is the optimal opening threshold interval; then the optimal opening threshold interval The optimal threshold value is the threshold value when the output power of the Trin generator is the maximum. . Reference Figure 8 , the specific process is:

[0043] S01: Set the hot end temperature and load of the Stirling generator to be constant;

[0044] S02: Settings Thresholds: ;

[0045] S03: Order , ;

[0046] S04: Move the excitation power piston a certain distance;

[0047] S05: Determine whether the Stirling generator is started, if so, go to step S06, if not, , go to step S02;

[0048] S06: Determine whether the displacement sensor waveform is distorted. If not, proceed to step S07. If so, , go to step S02;

[0049] S07: Determine whether the displacement sensor waveform is stable. If so, proceed to step S08. If not, , go to step S02;

[0050] S08: Obtain the optimal opening threshold interval ;

[0051] S09: Order , , ;

[0052] S10: Set the opening threshold of the one-way valve to ;

[0053] S11: Determine the output power of the Trane generator Is it greater than If yes, go to step S12, if no, go to step S13;

[0054] S12: Order , ;

[0055] S13: Order ;

[0056] S14: Determine whether it is equal to 0, if so, obtain the optimal opening zone threshold ; If not, return to step S10.

[0057] For the working conditions of Stirling generator hot end temperature change and load fluctuation, the output power of multiple groups of Stirling generators and the corresponding air pressure amplitude of the Stirling generator compression chamber and the corresponding one-way valve opening threshold are measured. Based on the multiple groups of measured data, the change curve of the one-way valve opening threshold with respect to the Stirling generator compression chamber air pressure amplitude and the Stirling generator output frequency is fitted, and the optimal opening threshold of the one-way valve is obtained according to the change curve.

[0058] Step S3: The host computer sends a control signal according to the optimal opening threshold of the one-way valve to drive the stepper motor to move; specifically: the control signal is input into the stepper motor driver through USB to serial port processing to drive the stepper motor to move, and the control signal includes pulse control and direction control;

[0059] Step S4: The stepper motor rotates counterclockwise or clockwise, and the transmission screw drives the rotatable valve cover to move the controlled step amount, thereby adjusting the deformation of the spring in the one-way valve. The spring contacts the valve core. When the gas pressure in the compression chamber of the Stirling generator is greater than the spring force, the valve core is lifted and the one-way valve opens. When the gas pressure in the compression chamber of the Stirling generator is less than the spring force, the valve core presses against the valve body and the one-way valve closes.

[0060] Deformation of the spring The opening threshold of the one-way valve satisfies the following formula:

[0061] in, is the opening threshold of the one-way valve, i.e. the opening pressure. is the area of ​​the compression chamber air inlet, is the elastic constant of the spring.

[0062] The relationship between the control quantity of a given stepper motor and the spring deformation satisfies the following formula:

[0063] in, is the number of input pulses, is the step size per rotation, The basic step angle refers to the fixed angle that the rotor rotates when the stepper motor receives an electrical pulse signal.

[0064] In practical applications, the specified one-way valve opening threshold can also be input into the host computer. The control signal output by the host computer is converted from USB to serial port to obtain the pulse control signal and direction control signal, which are input into the stepper motor driver. The stepper motor driver gives the step amount of the stepper motor.

[0065] In view of the problems of low adjustment accuracy and high labor / material cost in the threshold adjustment of the check valve of the static pressure gas bearing of the existing Stirling generator, the present invention innovatively designs a Stirling generator static pressure gas bearing with online threshold adjustment, which mainly includes a check valve, a stepper motor, and a throttle hole. The stepper motor in the pressure storage chamber is connected to the check valve cover, the programmable power supply collects the output voltage of the Stirling generator and sends it to the host computer, the displacement sensor collects the displacement of the power piston of the Stirling generator and sends it to the host computer, and the pressure sensor collects the gas pressure of the compression chamber of the Stirling generator and sends it to the host computer. The host computer controls the stepping amount of the stepper motor according to the displacement of the power piston, the gas pressure in the compression chamber, and the output threshold of the output voltage of the Stirling generator, so as to realize online adjustment of the check valve threshold without repeatedly disassembling and assembling the Stirling generator, effectively increasing the convenience of adjusting the opening threshold of the check valve of the static pressure gas bearing, improving the adjustment accuracy of the check valve threshold, effectively reducing the debugging time of the check valve threshold, and reducing labor and material costs.

[0066] Those skilled in the art may 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 equivalents, then these modifications and variations are also within the protection scope of the present invention.

[0067] The contents not described in detail in the specification are prior art known to those skilled in the art.

Claims

1. A method for adjusting a static pressure gas bearing of a Stirling generator with online threshold adjustment, characterized in that: The following steps are involved: Step S1: measuring the displacement of the power piston of the Stirling generator, the air pressure amplitude of the compression chamber of the Stirling generator, and the output power of the Stirling generator; Step S2: for the working condition where the temperature and load at the hot end of the Stirling generator are constant, the optimal opening threshold of the one-way valve is obtained according to the displacement of the power piston and the output power of the Stirling generator; for the working condition where the temperature at the hot end of the Stirling generator changes and the load fluctuates, the optimal opening threshold of the one-way valve is obtained according to the air pressure amplitude of the compression chamber of the Stirling generator and the output power of the Stirling generator; Step S3: The host computer sends a control signal according to the optimal opening threshold of the one-way valve to drive the stepper motor to move; Step S4: the stepper motor rotates counterclockwise or clockwise, and the transmission screw drives the rotatable valve cover to move the controlled step amount, so as to adjust the deformation of the spring in the one-way valve, and the spring contacts the valve core. When the gas pressure in the compression chamber of the Stirling generator is greater than the spring force, the valve core is lifted up and the one-way valve is opened. When the gas pressure in the compression chamber of the Stirling generator is less than the spring force, the valve core is pressed against the valve body and the one-way valve is closed. The static pressure gas bearing of the Stirling generator includes a static pressure gas bearing cylinder, a static pressure gas bearing round cover, a one-way valve and a stepper motor. The static pressure gas bearing round cover is located at the bottom of the static pressure gas bearing cylinder; the one-way valve includes a valve body, a valve core, and a valve cover. The valve body includes a fixed screw and a valve barrel. The interior of the valve barrel is a hollow valve cavity. The valve barrel is provided with an exhaust hole. The fixed screw is a hollow structure. The fixed screw is connected to the bottom of the valve barrel. The cavity of the fixed screw is connected to the valve cavity. The static pressure gas bearing round cover is provided with an air inlet hole. The air hole is connected with the cavity of the fixed screw, and the valve core is located at the bottom of the valve cylinder; a spring is arranged in the valve cavity, and the valve cover is located at the upper part of the valve cavity. The valve cover is connected to the valve cavity and can rotate in the valve cavity. One end of the spring contacts the valve core, and the other end contacts the valve cover. A spring limiting groove is arranged at the bottom of the valve cover, and one end of the spring is placed in the spring limiting groove. The driving screw of the stepper motor passes through the valve cover and extends into the spring. The spring can be compressed by the stepper motor to make the valve core press against the end of the fixed screw cavity, thereby cutting off the airflow path between the fixed screw cavity and the valve cavity.

2. The method for adjusting the static pressure gas bearing of a Stirling generator with online threshold adjustment according to claim 1, characterized in that: In step S1, the displacement of the power piston of the Stirling generator is collected by a displacement sensor; the air pressure amplitude of the compression chamber of the Stirling generator is collected by a pressure sensor; and the output power of the Stirling generator is collected by a programmable power supply.

3. The method for adjusting the static pressure gas bearing of a Stirling generator with online threshold adjustment according to claim 1, characterized in that: In step S2, for the working condition where the hot end temperature and load of the Stirling generator are constant, the one-way valve opening threshold under the conditions that the Stirling generator can start normally, the displacement sensor waveform is not distorted, the displacement sensor waveform is stable, and the Stirling generator output power is maximum is the optimal opening threshold.

4. The method for adjusting the static pressure gas bearing of a Stirling generator with online threshold adjustment as claimed in claim 3, characterized in that: In step S2, for the working condition where the temperature and load of the hot end of the Stirling generator are constant, the start threshold is first obtained under the condition that the Stirling generator can start normally, the displacement sensor waveform is not distorted, and the displacement sensor waveform is stable. ,by is the optimal opening zone threshold interval; Then take the optimal opening threshold interval The optimal threshold value is the threshold value when the output power of the Trin generator is the maximum. .

5. The method for adjusting the static pressure gas bearing of a Stirling generator with online threshold adjustment according to claim 3 or 4, characterized in that: The displacement sensor waveform refers to a curve of the displacement of the power piston measured by the displacement sensor changing with time.

6. The method for adjusting the static pressure gas bearing of a Stirling generator with online threshold adjustment as claimed in claim 5, characterized in that: The stable waveform of the displacement sensor refers to the stable displacement amplitude of the power piston of the Stirling generator.

7. The method for adjusting the static pressure gas bearing of a Stirling generator with online threshold adjustment according to claim 1, characterized in that: In step S2, for the working conditions of temperature change and load fluctuation at the hot end of the Stirling generator, the output power of multiple groups of Stirling generators and the corresponding air pressure amplitude of the compression chamber of the Stirling generator and the corresponding one-way valve opening threshold are measured. Based on the multiple groups of measured data, a change curve of the one-way valve opening threshold with respect to the air pressure amplitude of the compression chamber of the Stirling generator and the output frequency of the Stirling generator is fitted, and the optimal opening threshold of the one-way valve is obtained according to the change curve.

8. The method for adjusting the static pressure gas bearing of a Stirling generator with online threshold adjustment according to claim 1, characterized in that: In step S4, the deformation of the spring The opening threshold of the one-way valve satisfies the following formula: ， in, p is the opening threshold of the one-way valve, i.e. the opening pressure. s is the area of ​​the compression chamber air inlet, k is the elastic constant of the spring; The relationship between the control quantity of a given stepper motor and the spring deformation satisfies the following formula: ， in, is the number of input pulses, is the step size per rotation, is the basic step angle.

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