CN117662321A - Free piston thermoacoustic Stirling generator - Google Patents

Free piston thermoacoustic Stirling generator Download PDF

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Publication number
CN117662321A
CN117662321A CN202211048892.3A CN202211048892A CN117662321A CN 117662321 A CN117662321 A CN 117662321A CN 202211048892 A CN202211048892 A CN 202211048892A CN 117662321 A CN117662321 A CN 117662321A
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CN
China
Prior art keywords
piston
power converter
heat
power
stirling generator
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Pending
Application number
CN202211048892.3A
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Chinese (zh)
Inventor
张丽敏
胡剑英
罗二仓
陈燕燕
孙岩雷
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Technical Institute of Physics and Chemistry of CAS
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Technical Institute of Physics and Chemistry of CAS
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Application filed by Technical Institute of Physics and Chemistry of CAS filed Critical Technical Institute of Physics and Chemistry of CAS
Priority to CN202211048892.3A priority Critical patent/CN117662321A/en
Publication of CN117662321A publication Critical patent/CN117662321A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/0435—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines the engine being of the free piston type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/044—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines having at least two working members, e.g. pistons, delivering power output
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)

Abstract

The invention provides a free piston thermoacoustic Stirling generator, which comprises a shell, and a linear motor, a first thermal power converter and a second thermal power converter which are positioned in the shell; the linear motor comprises a power piston, the power piston can move along the length direction of the power piston, and the first heat-power converter and the second heat-power converter are oppositely arranged at two ends of the power piston in the length direction; the first thermal power converter and the first end of the power piston are constructed to form a first compression cavity, and the second thermal power converter and the second end of the linear motor are constructed to form a second compression cavity. According to the free piston thermoacoustic Stirling generator provided by the invention, the first compression cavity and the second compression cavity with high gas fluctuation pressure can simultaneously apply enough driving force to the power piston, so that the resonance movement of the power piston in a high-power application occasion and the high-efficiency working effect of the free piston thermoacoustic Stirling generator are ensured.

Description

Free piston thermoacoustic Stirling generator
Technical Field
The invention relates to the technical field of generators, in particular to a free piston thermoacoustic Stirling generator.
Background
The thermo-acoustic Stirling technology is a technology for realizing mutual conversion between acoustic energy and thermal energy based on a thermo-acoustic effect, and the thermo-acoustic Stirling generator mainly comprises a linear motor and a thermal power converter, wherein the thermal power converter can work as an engine in a positive cycle or as a refrigerator or a heat pump in a reverse cycle. In actual operation, when the system is in a generator working mode, the heat energy can be converted into mechanical energy in the form of sound waves by the heat-power converter through inputting high-temperature heat to the heat exchanger of the heat-power converter, and the linear motor further converts the mechanical energy into electric energy for output; when the system is in a refrigerating machine or heat pump working mode, electric energy is input, the linear motor converts the electric energy into mechanical energy in the form of sound waves, the sound waves are further consumed in the heat-power converter, heat is carried between the two heat exchangers, and the refrigerating or heat pumping effect is obtained.
In a free piston thermoacoustic Stirling generator, the power piston requires sufficient driving force to meet mechanical resonance conditions, thereby achieving overall high efficiency energy conversion. In the prior art, the two ends of the power piston are respectively a compression cavity and a back cavity, the back cavity has small gas fluctuation pressure, the driving force provided for the power piston is limited, and the power piston is difficult to provide enough power for the movement of the power piston in the high-power application occasion, so that the working effect of the free piston thermoacoustic Stirling generator is influenced.
Disclosure of Invention
The invention provides a free piston thermo-acoustic Stirling generator, which is used for solving the technical problem that the free piston thermo-acoustic Stirling generator in the prior art is difficult to provide enough driving force for a power piston in a high-power application occasion.
The invention provides a free piston thermoacoustic Stirling generator, which comprises a shell, and a linear motor, a first thermal power converter and a second thermal power converter which are positioned in the shell;
the linear motor comprises a power piston, the power piston can move along the length direction of the power piston, and the first heat-power converter and the second heat-power converter are oppositely arranged at two ends of the power piston in the length direction;
the first thermal power converter and the first end of the power piston are constructed to form a first compression cavity, and the second thermal power converter and the second end of the linear motor are constructed to form a second compression cavity.
According to the free piston thermoacoustic Stirling generator provided by the invention, the first thermal power converter comprises a first phase modulator, the second thermal power converter comprises a second phase modulator, and the first phase modulator and the second phase modulator are coaxially arranged.
According to the free piston thermoacoustic Stirling generator provided by the invention, the first thermal power converter further comprises a first expansion cavity, and the first expansion cavity is positioned at one side of the first phase modulator, which is away from the first compression cavity;
the second heat-power converter further comprises a second expansion cavity, wherein the second expansion cavity is positioned at one side of the second phase modulator, which is away from the second compression cavity.
According to the free piston thermoacoustic Stirling generator provided by the invention, the free piston thermoacoustic Stirling generator further comprises a connecting rod, one end of the connecting rod is connected with the first phase modulator, the other end of the connecting rod is connected with the second phase modulator so as to realize synchronous movement of the first phase modulator and the second phase modulator, and the connecting rod is movably arranged on the power piston in a penetrating way.
According to the free piston thermoacoustic Stirling generator provided by the invention, the first heat-power converter further comprises a first heat exchanger, a first heat regenerator and a second heat exchanger which are sequentially and coaxially connected, wherein the first heat exchanger, the first heat regenerator and the second heat exchanger are constructed to form a first movable channel, and the first phase modulator can move in the first movable channel;
the second heat-power converter further comprises a third heat exchanger, a second heat regenerator and a fourth heat exchanger which are sequentially and coaxially connected, wherein the third heat exchanger, the second heat regenerator and the fourth heat exchanger form a second movable channel, and the second phase modulator can move in the second movable channel.
According to the invention, the free piston thermoacoustic Stirling generator further comprises a cylinder barrel, and the power piston is at least partially positioned in the cylinder barrel and can move in the cylinder barrel.
According to the free piston thermoacoustic Stirling generator provided by the invention, the linear motor further comprises a back cavity, and the back cavity is formed by the space between the outer wall surface of the cylinder barrel and/or the power piston and the inner wall surface of the shell.
According to the free piston thermoacoustic Stirling generator provided by the invention, the linear motor further comprises a permanent magnet, a coil and an outer stator which are arranged in the back cavity;
the permanent magnet is connected with the power piston, the outer stator is fixed on the shell, and the coil is arranged in the outer stator.
According to the free piston thermoacoustic Stirling generator provided by the invention, the linear motor further comprises a bracket and an inner stator, wherein the inner stator is fixed on the outer wall surface of the cylinder barrel, and a first gap is arranged between the inner stator and the outer stator;
one end of the support is fixed on the power piston, the other end of the support is connected with the permanent magnet, and the permanent magnet movably penetrates through the first gap.
According to the free piston thermoacoustic Stirling generator provided by the invention, the linear motor further comprises an inner magnetizer, the inner magnetizer is fixed on the outer wall surface of the power piston, the permanent magnet is arranged on the inner magnetizer, and a second gap is arranged between the permanent magnet and the outer stator.
According to the free piston thermoacoustic Stirling generator, the first thermal power converter and the second thermal power converter are arranged at two ends of the power piston in the length direction relatively to form the first compression cavity and the second compression cavity, so that the first compression cavity and the second compression cavity with high gas fluctuation pressure can apply enough driving force to the power piston at the same time, and the resonant movement of the power piston and the working effect of the free piston thermoacoustic Stirling generator in high-power application occasions are guaranteed; in the engine mode, the first thermal power converter and the second thermal power converter can do work on the power piston, so that the linear motor outputs electric energy, and the working efficiency and the maximum output power of the free piston thermoacoustic Stirling generator are improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a free piston thermo-acoustic Stirling generator according to one embodiment of the invention;
fig. 2 is a schematic structural view of a free piston thermoacoustic stirling generator according to another embodiment of the present invention.
Reference numerals:
100: a housing; 1: a linear motor; 10: a power piston; 11: a cylinder; 12: a back cavity; 13: a permanent magnet; 14: a coil; 15: an outer stator; 16: a bracket; 17: an inner stator; 18: an inner magnetizer; 2: a first heat-power converter; 21: a first phase modulator; 22: a first expansion chamber; 23: a first heat exchanger; 24: a first regenerator; 25: a second heat exchanger; 3: a second heat-power converter; 31: a second phase modulator; 32: a second expansion chamber; 33: a third heat exchanger; 34: a second regenerator; 35: a fourth heat exchanger; 4: a first compression chamber; 5: a second compression chamber; 6: and a connecting rod.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The prior art free piston thermoacoustic stirling generators typically include a linear motor and a thermal power converter located on one side of the linear motor. A compression cavity is arranged between a power piston of the linear motor and the heat-power converter, a back cavity is arranged in a space formed between one end, far away from the heat-power converter, of the power piston and the inner wall surface of the shell, and the power piston linearly reciprocates between the compression cavity and the back cavity.
In general, since the average gas fluctuation pressure of the compression chamber is greater than that of the back chamber, the pressure fluctuation at two ends of the power piston is different, the back chamber provides a smaller driving force for the power piston, and the axial rigidity of the power piston can be affected in high-power application occasions. The larger the maximum output power of the free piston thermoacoustic Stirling generator is, the larger the moving mass of the power piston is correspondingly increased, and the required axial rigidity of the power piston is also increased along with the multiple of the product of the moving mass and the square of the angular frequency, so that the axial rigidity of the power piston is a main factor for limiting the maximum output power of the free piston thermoacoustic Stirling generator. In order to improve the maximum output power, the free piston thermoacoustic Stirling generator in the prior art needs to increase the diameter of the power piston, but the length of the power piston is basically unchanged, so that the structural stress problem of a thermal power converter can be brought, and the service life and the reliability of the free piston thermoacoustic Stirling generator are affected.
As shown in fig. 1 or 2, the free piston thermoacoustic stirling generator provided by the present invention includes a housing 100, and a linear motor 1, a first thermal power converter 2, and a second thermal power converter 3 located within the housing 100.
The linear motor 1 comprises a power piston 10, the power piston 10 can move along the length direction of the power piston, and the first heat-power converter 2 and the second heat-power converter 3 are oppositely arranged at two ends of the power piston 10 in the length direction.
The first thermal power converter 2 and the first end of the power piston 10 are constructed to form a first compression chamber 4, and the second thermal power converter 3 and the second end of the linear motor 1 are constructed to form a second compression chamber 5.
The housing 100 has a cavity in which the linear motor 1, the first heat-power converter 2 and the second heat-power converter 3 are all located, and the power piston 10 of the linear motor 1 reciprocates along its own central axis within the cavity. Wherein the first heat-power converter 2 and the second heat-power converter 3 may have the same structure and size or may have different structures and sizes. For example, in one embodiment, as shown in fig. 1, the first and second heat-power converters 2 and 3 are identical in structure and size, and the first and second heat-power converters 2 and 3 are symmetrically disposed about a center line of the linear motor 1 perpendicular to the central axis.
Because the gas fluctuation pressure of the first compression chamber 4 and the second compression chamber 5 is higher, the first compression chamber 4 and the second compression chamber 5 can provide enough driving force for the power piston 10, and the axial rigidity of the power piston 10 is ensured. On the basis of not changing the diameter of the power piston 10, the free piston thermoacoustic Stirling generator provided by the invention can improve the maximum output power; on the basis of the same maximum output power, the power piston 10 of the free piston thermoacoustic Stirling generator provided by the invention has smaller diameter, can effectively reduce structural stress and improves the reliability of the whole system.
When the free piston thermoacoustic Stirling generator is in a generator mode, the first and second heat-power converters 2 and 3 are both engines, convert heat energy into mechanical energy in the form of sound waves, and drive the power piston 10 to reciprocate along the central axis of the power piston, so that the mechanical energy is converted into electric energy to be output.
When the free piston thermoacoustic Stirling generator is in a refrigerator or heat pump mode, the linear motor 1 converts electric energy into mechanical energy in the form of sound waves, the sound waves are further consumed in the first and second heat-power converters 2 and 3, and the first and second heat-power converters 2 and 3 carry out heat, so that the refrigerating or pumping effect is achieved.
The free piston thermoacoustic Stirling generator provided by the invention can further comprise a heat driving cold electric mode, one of the first thermal power converter 2 and the second thermal power converter 3 operates in an engine mode, the other operates in a refrigerator or a heat pump mode, the thermal power converter operating in the engine mode absorbs heat energy and converts the heat energy into mechanical energy, a part of the mechanical energy is transferred to the thermal power converter at the other side to realize pump heat, the other part of the mechanical energy is transferred to the power piston 10, the power piston 10 is driven to reciprocate along the central shaft of the power piston, and the mechanical energy is converted into electric energy to be output.
According to the free piston thermoacoustic Stirling generator provided by the invention, the first thermal power converter 2 and the second thermal power converter 3 are arranged at two ends of the power piston 10 in the length direction relatively, so that the first compression cavity 4 and the second compression cavity 5 are formed, the first compression cavity 4 and the second compression cavity 5 with higher gas fluctuation pressure can apply enough driving force to the power piston 10 at the same time, and the resonance movement of the power piston 10 and the working effect of the free piston thermoacoustic Stirling generator in high-power application occasions are ensured; in the engine mode, the first thermal power converter 2 and the second thermal power converter 3 can both apply work to the power piston 10, so that the linear motor 1 outputs electric energy, and the working efficiency and the maximum output power of the free piston thermoacoustic Stirling generator are improved.
Further, the first thermal power converter 2 includes a first phase modulator 21, the second thermal power converter 3 includes a second phase modulator 31, and the first phase modulator 21 and the second phase modulator 31 are coaxially arranged.
The first and second phase modulators 21 and 31 are used to adjust the system sound field distribution of the free piston thermo-acoustic stirling generator and to transmit expansion work such that the gas micro-clusters inside the first and second thermal power converters 2 and 3 undergo a traveling wave thermo-acoustic conversion cycle to achieve higher thermo-acoustic conversion efficiency.
The first phase modulator 21 and the second phase modulator 31 are distributed on two sides of the power piston 10, the first phase modulator 21 and the second phase modulator 31 are both coaxially arranged with the power piston 10, and the first phase modulator 21 and the second phase modulator 31 can both reciprocate along the straight line where the central axis of the first phase modulator and the second phase modulator 31 is located. The positions of the first and second phase modulators 21 and 31 in the stopped state may be symmetrical or asymmetrical with respect to the center line of the linear motor 1 perpendicular to the center axis, and the present invention is not particularly limited.
The first heat-power converter 2 further comprises a first expansion chamber 22, the first expansion chamber 22 being located on the side of the first phase modulator 21 facing away from the first compression chamber 4; the second heat-power converter 3 further comprises a second expansion chamber 32, the second expansion chamber 32 being located on the side of the second phase modulator 31 facing away from the second compression chamber 5. The phase modulator recovers the acoustic work at the expansion chamber and transmits it to the compression chamber, driving the power piston 10 to move, thereby outputting electric energy to the outside.
In an alternative embodiment, the first heat-power converter 2 comprises a first leaf spring, the first leaf spring is arranged on the end surface of the first heat-power converter 2 near the linear motor 1, and the first leaf spring is connected with the first phase modulator 21; the second heat-power converter comprises a second plate spring, the second plate spring is arranged on the end face of the second heat-power converter 3, which is close to the linear motor 1, and the second plate spring is connected with the second phase modulator 31.
The first and second leaf springs can provide axial rigidity to the first and second phase modulators 21 and 31, causing the first and second phase modulators 21 and 31 to reciprocate linearly in the axial direction thereof. The first leaf spring and the second leaf spring can also provide a larger radial stiffness for the first phase modulator 21 and the second phase modulator 31, so that the first phase modulator 21 and the second phase modulator 31 do not generate radial movement in the movement process. The first and second leaf springs also ensure the supporting and centering effects of the first and second phase modulators 21 and 31.
In this embodiment, the first plate spring is hermetically connected to the inner wall of the first heat-power converter 2, and the first expansion chamber 22 and the first compression chamber 4 are partitioned from each other on both sides of the first plate spring; the second leaf spring is connected to the inner wall of the second heat-power converter 3 in a sealing manner, and the second expansion chamber 32 and the second compression chamber 5 are separated from each other on both sides of the two leaf springs.
In another alternative embodiment, the free piston thermoacoustic Stirling generator further comprises a connecting rod 6, one end of the connecting rod 6 is connected to the first phase modulator 21, and the other end is connected to the second phase modulator 31, so as to realize synchronous movement of the first phase modulator 21 and the second phase modulator 31, and the connecting rod 6 is movably arranged through the power piston 10.
In this embodiment, the power piston 10 is provided with a through hole along its central axis, and the connecting rod 6 is provided in the through hole in a penetrating manner and has a gap with the through hole, so as to ensure that the power piston 10 and the connecting rod 6 do not affect each other and move freely.
The first phase modulator 21 and the second phase modulator 31 are rigidly connected through the connecting rod 6, the first phase modulator 21 and the second phase modulator 31 synchronously move, the phase relation between the expansion of expansion cavities at two sides and the compression of compression cavities at two sides of the power piston 10 is locked, the phase modulation effect of the first phase modulator 21 and the second phase modulator 31 is balanced, and the adjustment difficulty of the first phase modulator 21 and the second phase modulator 31 is reduced.
The first heat-power converter 2 further comprises a first heat exchanger 23, a first heat regenerator 24 and a second heat exchanger 25 which are sequentially and coaxially connected, wherein the first heat exchanger 23, the first heat regenerator 24 and the second heat exchanger 25 form a first movable channel, and the first phase modulator 21 can move in the first movable channel.
The second heat-power converter further comprises a third heat exchanger 33, a second heat regenerator 34 and a fourth heat exchanger 35 which are sequentially and coaxially connected, wherein the third heat exchanger 33, the second heat regenerator 34 and the fourth heat exchanger 35 form a second movable channel, and the second phase modulator 31 can move in the second movable channel.
In the first heat-power converter 2, the first heat exchanger 23, the first regenerator 24 and the second heat exchanger 25 are installed in the housing 100 in an annular shape in order along the axial direction of the first phase modulator 21, the first heat exchanger 23 is located at one side close to the first expansion chamber 22, and the central axes of the first heat exchanger 23, the first regenerator 24, the second heat exchanger 25 and the first phase modulator 21 are located on the same straight line. The hollow areas of the first heat exchanger 23, the first regenerator 24 and the second heat exchanger 25 form a first movable passage in which the first phase modulator 21 linearly reciprocates along its own central axis. The first heat exchanger 23, the first regenerator 24 and the second heat exchanger 25 form a temperature gradient. Wherein, the first phase modulator 21 is in clearance seal fit with the inner wall of the first movable channel. The structure of the second heat-power converter 3 is substantially the same as that of the first heat-power converter 2, and will not be described here again.
When the free piston thermoacoustic stirling generator is in generator mode, the first and second heat-to-power converters 2 and 3 are both engines, the first and third heat exchangers 23 and 33 absorb thermal energy as heaters, the second and fourth heat exchangers 25 and 35 are coolers, and the first and second heat exchangers 23, 24 and 25 form a decreasing temperature gradient. The first and second heat power converters 2 and 3 convert the absorbed heat energy into mechanical energy in the form of sound waves, and drive the power piston 10 to reciprocate along its own central axis, thereby converting the mechanical energy into electric energy for output.
When the free piston thermoacoustic stirling generator is in a refrigerator or heat pump mode, the linear motor 1 converts electrical energy into mechanical energy in the form of sound waves, which are further consumed in the first and second heat-power converters 2, 3, the first and third heat exchangers 23, 33 operate as low temperature heat exchangers, the second and fourth heat exchangers 25, 35 are high temperature heat exchangers, and the first, second and third heat exchangers 23, 24, 25 form an increasing temperature gradient. Heat is transferred from the first heat exchanger 23 to the second heat exchanger 25 in the first heat-power converter 2, and heat is transferred from the third heat exchanger 33 to the fourth heat exchanger 35 in the second heat-power converter 3, whereby a cooling effect is achieved by the first heat exchanger 23 and the third heat exchanger 33, or an effect of a heat pump is achieved by the second heat exchanger 25 and the fourth heat exchanger 35.
The linear motor 1 further comprises a cylinder 11, the power piston 10 being at least partially located within the cylinder 11 and being movable within the cylinder 11. The cylinder 11 is fixed in the housing 100, and the power piston 10 is in clearance seal fit with the inner wall of the cylinder 11.
The linear motor 1 further includes a back chamber 12, and a space between the outer wall surface of the cylinder tube 11 and/or the power piston 10 and the inner wall surface of the housing 100 forms the back chamber 12.
The linear motor 1 further comprises a permanent magnet 13, a coil 14 and an outer stator 15 arranged in the back chamber 12. The permanent magnet 13 is connected to the power piston 10, the outer stator 15 is fixed to the housing 100, and the coil 14 is disposed in the outer stator 15. When the free piston thermoacoustic Stirling generator is in generator mode, the gas pressure in the first compression chamber 4 and the second compression chamber 5 pushes the power piston 10 and drives the permanent magnet 13 to reciprocate. When the free piston thermoacoustic Stirling generator is in a refrigerator or heat pump mode, the linear motor 1 is a motor, the coil 14 generates a magnetic field after alternating current is introduced, and the permanent magnet 13 receives the action of ampere force in the magnetic field to drive the power piston 10 to linearly reciprocate.
In an alternative embodiment, as shown in fig. 1, the linear motor 1 further includes a bracket 16 and an inner stator 17, the inner stator 17 is fixed to an outer wall surface of the cylinder 11, and a first gap is provided between the inner stator 17 and the outer stator 15. One end of the bracket 16 is fixed on the power piston 10, the other end of the bracket 16 is connected with the permanent magnet 13, and the permanent magnet 13 is movably arranged in the first gap in a penetrating way.
In this embodiment, the permanent magnet 13 is rigidly connected to the power piston 10 through the bracket 16, the permanent magnet 13 and the power piston 10 move synchronously, the cylinder 11 is fixed in the housing 100, the outer wall surface is provided with a avoiding hole for avoiding the bracket 16, and the inner stator 17 and the outer stator 15 are arranged on a central line of the linear motor 1 perpendicular to the central shaft. The permanent magnet 13 linearly reciprocates in the axial direction of the power piston 10 in the first gap between the inner stator 17 and the outer stator 15.
In another alternative embodiment, as shown in fig. 2, the linear motor 1 further includes an inner magnetizer 18, the inner magnetizer 18 is fixed to an outer wall surface of the power piston 10, and the permanent magnet 13 is mounted on the inner magnetizer 18, with a second gap between the permanent magnet 13 and the outer stator 15.
In this embodiment, the linear motor 1 is not provided with an inner stator, but the inner magnetizer 18 is mounted on the outer wall surface of the power piston 10, so that the permanent magnet 13, the inner magnetizer 18 and the power piston 10 are rigidly connected, and the three synchronously move. Wherein, the outer wall surface of cylinder 11 has offered the hole of dodging that is used for dodging interior magnetizer 18.
According to the free piston thermoacoustic Stirling generator provided by the invention, the first thermal power converter 2 and the second thermal power converter 3 are arranged at two ends of the power piston 10 in the length direction relatively, so that the first compression cavity 4 and the second compression cavity 5 are formed, the first compression cavity 4 and the second compression cavity 5 with higher gas fluctuation pressure can apply enough driving force to the power piston 10 at the same time, and the resonance movement of the power piston 10 and the working effect of the free piston thermoacoustic Stirling generator in high-power application occasions are ensured; in the engine mode, the first thermal power converter 2 and the second thermal power converter 3 can both apply work to the power piston 10, so that the linear motor 1 outputs electric energy, and the working efficiency and the maximum output power of the free piston thermoacoustic Stirling generator are improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A free piston thermoacoustic stirling generator comprising a housing, and a linear motor, a first thermal power converter and a second thermal power converter located within the housing;
the linear motor comprises a power piston, the power piston can move along the length direction of the power piston, and the first heat-power converter and the second heat-power converter are oppositely arranged at two ends of the power piston in the length direction;
the first thermal power converter and the first end of the power piston are constructed to form a first compression cavity, and the second thermal power converter and the second end of the linear motor are constructed to form a second compression cavity.
2. The free-piston thermoacoustic stirling generator of claim 1 wherein the first thermal power converter comprises a first phase modulator and the second thermal power converter comprises a second phase modulator, the first and second phase modulators being coaxially disposed.
3. The free piston thermoacoustic stirling generator of claim 2 wherein the first thermal power converter further comprises a first expansion chamber, the first expansion chamber being located on a side of the first phase modulator facing away from the first compression chamber;
the second heat-power converter further comprises a second expansion cavity, wherein the second expansion cavity is positioned at one side of the second phase modulator, which is away from the second compression cavity.
4. A free-piston thermo-acoustic stirling generator in accordance with claim 3 further comprising a connecting rod having one end connected to the first phase modulator and the other end connected to the second phase modulator to achieve synchronous movement of the first and second phase modulators, the connecting rod movably disposed through the power piston.
5. The free-piston thermoacoustic stirling generator of claim 3 or 4 wherein the first thermal power converter further comprises a first heat exchanger, a first regenerator, and a second heat exchanger coaxially connected in sequence, the first heat exchanger, the first regenerator, and the second heat exchanger being configured to form a first active channel, the first phase modulator being movable in the first active channel;
the second heat-power converter further comprises a third heat exchanger, a second heat regenerator and a fourth heat exchanger which are sequentially and coaxially connected, wherein the third heat exchanger, the second heat regenerator and the fourth heat exchanger form a second movable channel, and the second phase modulator can move in the second movable channel.
6. The free piston thermoacoustic stirling generator of claim 1 wherein the linear motor further comprises a cylinder, the power piston being at least partially located within the cylinder and movable within the cylinder.
7. A free piston thermoacoustic stirling generator according to claim 6 wherein the linear motor further comprises a back chamber, the back chamber being formed by a space between the outer wall surface of the cylinder and/or the power piston and the inner wall surface of the housing.
8. The free piston thermoacoustic stirling generator of claim 7 wherein the linear motor further comprises a permanent magnet, a coil, and an outer stator disposed in the back cavity;
the permanent magnet is connected with the power piston, the outer stator is fixed on the shell, and the coil is arranged in the outer stator.
9. The free piston thermo-acoustic stirling generator of claim 8 wherein the linear motor further comprises a bracket and an inner stator, the inner stator being secured to an outer wall of the cylinder with a first gap therebetween;
one end of the support is fixed on the power piston, the other end of the support is connected with the permanent magnet, and the permanent magnet movably penetrates through the first gap.
10. The free piston thermoacoustic stirling generator of claim 8 wherein the linear motor further comprises an inner magnetizer secured to an outer wall surface of the power piston, the permanent magnet being mounted to the inner magnetizer with a second gap between the permanent magnet and the outer stator.
CN202211048892.3A 2022-08-30 2022-08-30 Free piston thermoacoustic Stirling generator Pending CN117662321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211048892.3A CN117662321A (en) 2022-08-30 2022-08-30 Free piston thermoacoustic Stirling generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211048892.3A CN117662321A (en) 2022-08-30 2022-08-30 Free piston thermoacoustic Stirling generator

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Publication Number Publication Date
CN117662321A true CN117662321A (en) 2024-03-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211048892.3A Pending CN117662321A (en) 2022-08-30 2022-08-30 Free piston thermoacoustic Stirling generator

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Country Link
CN (1) CN117662321A (en)

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