An experimental device integrating a Stirling engine gas spring and a self-pumping aerostatic bearing

Abstract

The present invention discloses an integrated experimental device for a Stirling engine gas spring and a self-pumping aerostatic bearing, which relates to the technical field of Stirling engines. The device includes a cylinder block and a gas distribution piston. The gas distribution piston reciprocates left and right inside the cylinder block. A simulated expansion chamber is formed between the front end of the cylinder block and the front end of the gas distribution piston, and a simulated compression chamber is formed between the rear end of the cylinder block and the rear end of the gas distribution piston. The simulated expansion chamber and the simulated compression chamber are connected through a gas passage. The central axis of the cylinder block extends into the interior of the rear end of the gas distribution piston, and a front gas spring chamber and a rear gas spring chamber are respectively formed by the central axis of the cylinder block and the rear end of the gas distribution piston. A static pressure gas bearing pump hole is provided on the central axis of the cylinder block, and a static pressure bearing high-pressure chamber is arranged inside the central axis of the cylinder block. The static pressure gas bearing pump hole is connected to the static pressure bearing high-pressure chamber. The present invention realizes the decoupling of the gas support system and the working cycle of the heat engine, and can study the influence of various design parameters on the performance of the gas support system.

Description

Technical Field

[0001] The present invention relates to the technical field of Stirling engines, and particularly relates to an integrated experimental device for a Stirling engine gas spring and a self-pumping aerostatic bearing. Background Art

[0002] Free piston Stirling generators are widely used due to their high efficiency, long life, and rich heat source types. Currently, the mainstream moving element system of free piston Stirling generators uses leaf springs for support. With the increase in the power of the generator, the leaf springs restrict the further improvement of the power density of the generator due to their large unit stiffness mass and easy fatigue characteristics. The gas support system based on gas springs and self-pumping aerostatic bearings can further improve the power density of the heat engine and reduce vibration and noise while providing axial and radial support stiffness. The working characteristics of gas springs and self-pumping aerostatic bearings are highly coupled, and the design parameters and operating mechanisms are complex. In order to decouple the gas support system from the working cycle of the heat engine, study the influence of various design parameters on the performance of the gas support system, an integrated experimental device for a Stirling engine gas spring and a self-pumping aerostatic bearing is proposed. Summary of the Invention

[0003] The purpose of the present invention is to provide an integrated experimental device for a Stirling engine gas spring and a self-pumping aerostatic bearing, to achieve the decoupling of the gas support system from the working cycle of the heat engine, and to study the influence of various design parameters on the performance of the gas support system.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An integrated experimental device for a Stirling engine gas spring and a self-pumping aerostatic bearing of the present invention includes a cylinder block and a gas distribution piston. The gas distribution piston reciprocates left and right inside the cylinder block. A simulated expansion chamber is formed between the front end of the cylinder block and the front end of the gas distribution piston, and a simulated compression chamber is formed between the rear end of the cylinder block and the rear end of the gas distribution piston. The simulated expansion chamber and the simulated compression chamber are connected through a gas passage; the central axis of the cylinder block extends into the inside of the rear end of the gas distribution piston, and a front gas spring chamber and a rear gas spring chamber are respectively formed by the central axis of the cylinder block and the rear end of the gas distribution piston. A static pressure gas bearing pump hole is provided on the central axis of the cylinder block, and a static pressure bearing high-pressure chamber is arranged inside the central axis of the cylinder block. The static pressure gas bearing pump hole is communicated with the static pressure bearing high-pressure chamber.

[0006] Preferably, the simulated expansion chamber is connected to an external linear compressor.

[0007] Preferably, an optical observation window and a laser displacement sensor are provided at one end of the cylinder block close to the simulated expansion chamber. The optical observation window is installed in the middle of the front end of the cylinder block, and the laser displacement sensor is located on the optical observation window and the laser displacement sensor faces the gas distribution piston directly.

[0008] Preferably, a first pressure sensor is connected to the rear gas spring chamber, a second pressure sensor is connected to the high-pressure chamber of the hydrostatic bearing, a third pressure sensor is connected to the front gas spring chamber, and a fourth pressure sensor is connected to the simulated expansion chamber.

[0009] Preferably, a first temperature sensor is connected to the rear gas spring chamber, a second temperature sensor is connected to the front gas spring chamber, and a plurality of temperature sensors are evenly connected to the inner wall of the cylinder block.

[0010] Preferably, eddy current sensors are respectively connected to the gaps between the gas distribution piston and the cylinder block, between the front gas spring chamber and the rear gas spring chamber, and between the rear gas spring chamber and the simulated compression chamber.

[0011] Preferably, the data of all sensors are synchronously processed by a high-speed multi-channel data acquisition device to analyze the phase relationship between various parameters under the operating state.

[0012] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0013] The present invention relates to an integrated experimental device for a Stirling engine gas spring and a self-pumping hydrostatic bearing. In this application, the gas spring and the hydrostatic bearing support system are separated from the complex generator and analyzed separately, making the research on design parameters and operating mechanisms simpler; the pressure fluctuation is precisely provided externally, eliminating the complex pneumatic coupling relationship between the gas distribution piston - working chamber - power piston; there are no heater, regenerator, and cooler components outside the gas distribution piston in this application, eliminating the coupling relationship between the thermodynamics and dynamics processes in the generator, so that the "dual-gas" support system can be designed and optimized independently of the generator; an optical observation window is provided at the front end of the gas distribution piston in this application, pressure and temperature sensors are provided at different cavity positions, and eddy current sensors are installed at the gap positions, so that parameters such as piston displacement, cavity pressure, working medium temperature, and piston eccentricity and the phase relationship between the parameters can be obtained in real time during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the drawings.

[0015] Figure 1 It is a sectional view of the overall structure of an integrated experimental device for a Stirling engine gas spring and a self-pumping hydrostatic bearing of the present invention.

[0016] Explanation of the accompanying symbols: 1. Simulated expansion chamber; 2. Eddy current sensor; 3. First temperature sensor; 4. Second temperature sensor; 5. Simulated compression chamber; 6. Hydrostatic bearing high-pressure chamber; 7. First pressure sensor; 8. Second pressure sensor; 9. Rear gas spring chamber; 10. Third pressure sensor; 11. Front gas spring chamber; 12. Fourth pressure sensor; 13. Linear compressor; 14. Laser displacement sensor; 15. Optical observation window; 16. Cylinder body; 17. Gas distribution piston; 18. Gas channel; 19. Hydrostatic gas bearing pump air hole. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] like Figure 1 As shown, a Stirling machine gas spring and self-pumping gas hydrostatic bearing integrated experimental device includes a cylinder body 16 and a gas distribution piston 17, the gas distribution piston 17 reciprocates left and right inside the cylinder body 16, the front end of the cylinder body 16 and the front end of the gas distribution piston 17 form a simulated expansion chamber 1, the rear end of the cylinder body 16 and the rear end of the gas distribution piston 17 form a simulated compression chamber 5, and the simulated expansion chamber 1 and the simulated compression chamber 5 are connected through a gas channel 18; the central axis of the cylinder body 16 extends into the interior of the rear end of the gas distribution piston 17, and the central axis of the cylinder body 16 and the rear end of the gas distribution piston 17 respectively form a front gas spring chamber 11 and a rear gas spring chamber 9, a hydrostatic gas bearing pump air hole 19 is provided on the central axis of the cylinder body 16, a hydrostatic bearing high-pressure chamber 6 is provided in the central axis of the cylinder body 16, and the hydrostatic gas bearing pump air hole 19 is connected to the hydrostatic bearing high-pressure chamber 6.

[0019] An air film will be generated in the gap between the outer side of the high-pressure chamber 6 of the hydrostatic bearing and the gas distribution piston 17 to support the gas distribution piston 17 without contact with the central axis of the cylinder body 16, providing radial force for the gas distribution piston 17. The front gas spring chamber 11 and the rear gas spring chamber 9 provide rebound force for the gas distribution piston 17 during reciprocating motion.

[0020] The simulated expansion chamber 1 is connected to an external linear compressor 13 , and the simulated expansion chamber 1 is provided with fluctuating periodic pressure by the linear compressor.

[0021] An optical observation window 15 and a laser displacement sensor 14 are provided at one end of the cylinder block 16 close to the simulated expansion chamber 1. The optical observation window 15 is installed in the middle of the front end of the cylinder block 16. The laser displacement sensor 14 is located on the optical observation window 15 and the laser displacement sensor 14 is directly opposite to the gas distribution piston 17. The laser displacement sensor 14 acquires displacement signals in real time during the operation of the gas distribution piston 17.

[0022] A first pressure sensor 7 is connected in the rear gas spring chamber 9, a second pressure sensor 8 is connected in the static pressure bearing high-pressure chamber 6, a third pressure sensor 10 is connected in the front gas spring chamber 11, and a fourth pressure sensor 12 is connected in the simulated expansion chamber 1. Highly sensitive pressure sensors capture the pressure fluctuations of the working medium gas in each chamber.

[0023] A first temperature sensor 3 is connected in the rear gas spring chamber 9, a second temperature sensor 4 is connected in the front gas spring chamber 11, and a plurality of temperature sensors are evenly connected to the inner wall of the cylinder block 16. Temperature parameters of the working medium gas at various positions are obtained during the experiment.

[0024] Eddy current sensors 2 are respectively connected to the gaps between the gas distribution piston 17 and the cylinder block 16, between the front gas spring chamber 11 and the rear gas spring chamber 9, and between the rear gas spring chamber 9 and the simulated compression chamber 5 to obtain the operating characteristics of the static pressure bearing and the dynamic information of the gap thickness.

[0025] Data of all sensors are synchronously processed by a high-speed multi-channel data acquisition device to analyze the phase relationship between various parameters in the operating state.

[0026] The use process of the present invention is as follows:

[0027] 1) The linear compressor 13 pressurizes the simulated expansion chamber 1. Due to the area difference at both ends of the gas distribution piston 17, the gas distribution piston 17 moves to the right. At this time, the gas in the front gas spring chamber 11 is compressed, the temperature rises and the pressure increases, and the gas in the rear gas spring chamber 9 expands, the temperature drops and the pressure decreases.

[0028] 2) When the movement of the gas distribution piston 17 reaches the critical point, as the pressure provided by the linear compressor 13 decreases, at this time, the gas distribution piston 17 moves to the left. The gas in the rear gas spring chamber 9 is compressed, the temperature rises and the pressure increases, and the gas in the front gas spring chamber 11 expands, the temperature drops and the pressure decreases.

[0029] 3) The pressure sensors and temperature sensors monitor the changes in gas pressure and temperature in the front gas spring chamber 11 and the rear gas spring chamber 9 in real time. Combining numerical analysis to study the heat transfer of the gas spring and the gas relaxation mechanism, the change of the gap eccentricity is observed through the eddy current sensor 2 during the movement process.

[0030] 4) Finally, the obtained periodic data can be used to analyze the gas relaxation characteristics in the spring and the characteristics of the hydrostatic gas bearing.

[0031] In one specific embodiment, a set of typical experimental data is as follows:

[0032]

[0033]

[0034] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0035] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A Stirling engine gas spring and self-pumping aerostatic bearing integrated experimental device, characterized in that: It includes a cylinder block (16) and a gas distribution piston (17). The gas distribution piston (17) reciprocates left and right inside the cylinder block (16). The front end of the cylinder block (16) and the front end of the gas distribution piston (17) form an analog expansion chamber (1). The rear end of the cylinder block (16) and the rear end of the gas distribution piston (17) form an analog compression chamber (5). The analog expansion chamber (1) and the analog compression chamber (5) are connected through a gas passage (18). The central axis of the cylinder block (16) extends into the inside of the rear end of the gas distribution piston (17), and the central axis of the cylinder block (16) and the rear end of the gas distribution piston (17) respectively form a front gas spring chamber (11) and a rear gas spring chamber (9). A static pressure gas bearing pumping hole (19) is provided on the central axis of the cylinder block (16). A static pressure bearing high-pressure chamber (6) is provided inside the central axis of the cylinder block (16). The static pressure gas bearing pumping hole (19) and the static pressure bearing high-pressure chamber (6) are connected. A first pressure sensor (7) is connected inside the rear gas spring chamber (9). A second pressure sensor (8) is connected inside the static pressure bearing high-pressure chamber (6). A third pressure sensor (10) is connected inside the front gas spring chamber (11). A fourth pressure sensor (12) is connected inside the analog expansion chamber (1). A first temperature sensor (3) is connected inside the rear gas spring chamber (9). A second temperature sensor (4) is connected inside the front gas spring chamber (11). A plurality of temperature sensors are evenly connected to the inner wall of the cylinder block (16). The gaps between the gas distribution piston (17) and the cylinder block (16), between the front gas spring chamber (11) and the rear gas spring chamber (9), and between the rear gas spring chamber (9) and the analog compression chamber (5) are respectively connected with eddy current sensors (2).

2. The Stirling engine gas spring and self-pumping aerostatic bearing integrated experimental device according to claim 1, characterized in that: The analog expansion chamber (1) is connected to an external linear compressor (13).

3. The Stirling engine gas spring and self-pumping aerostatic bearing integrated experimental device according to claim 2, characterized in that: An optical observation window (15) and a laser displacement sensor (14) are provided at one end of the cylinder block (16) close to the analog expansion chamber (1). The optical observation window (15) is installed in the middle of the front end of the cylinder block (16). The laser displacement sensor (14) is located on the optical observation window (15) and the laser displacement sensor (14) faces the gas distribution piston (17).

4. The Stirling engine gas spring and self-pumping aerostatic bearing integrated experimental device according to claim 3, characterized in that: Data of all sensors are synchronously processed by a high-speed multi-channel data acquisition device to analyze the phase relationship between various parameters under the operating state.

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