CN109882310B - Stirling heat engine - Google Patents
Stirling heat engine Download PDFInfo
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- CN109882310B CN109882310B CN201910166999.XA CN201910166999A CN109882310B CN 109882310 B CN109882310 B CN 109882310B CN 201910166999 A CN201910166999 A CN 201910166999A CN 109882310 B CN109882310 B CN 109882310B
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Abstract
The invention relates to the technical field of thermoacoustic equipment, in particular to a Stirling heat engine. This stirling heat engine includes the gas spring phase modifier at least, the gas spring phase modifier includes cylinder and flange, the flange will the cylinder is separated for first cylinder and second cylinder, be equipped with first piston in the first cylinder, be equipped with the second piston in the second cylinder, first piston with the second piston passes through piston bearing and links to each other, the flange is equipped with the confession the shaft hole that piston bearing passed, form first gas chamber between first cylinder, first piston and the flange, form second gas chamber between second cylinder, second piston and the flange. According to the Stirling heat engine provided by the invention, the traditional plate spring structure phase modulator is replaced by the gas spring phase modulator, so that the gas spring phase modulator can obtain enough rigidity and deformation during phase modulation, and the phase modulation requirement of a high-power Stirling heat engine is further met.
Description
Technical Field
The invention relates to the technical field of thermoacoustic equipment, in particular to a Stirling heat engine.
Background
Thermoacoustic systems are a technology for achieving energy conversion between thermal energy and sound waves. In order to achieve a desired conversion efficiency, critical components in a thermoacoustic system must achieve a specific sound field phase relationship, and therefore the phase modulator is an essential component in a thermoacoustic system. Two ends of the phase modulator are respectively connected with different thermo-acoustic system components, and different acoustic impedances are realized at two ends of the phase modulator. The general acoustic phase modulator mainly uses sound volume, sound inductance, resonance tube to modulate phase, while the mechanical phase modulator mainly uses the resonance system composed of spring piston to modulate phase. Mechanical phase modulators are more compact and have less flow losses than acoustic phase modulators.
The traditional free piston Stirling heat engine is mainly divided into an integral type and a separated type according to the structure. The integral piston Stirling heat engine is mainly divided into two structural forms. One form of construction is: a condenser rod passes through the compressor piston and a condenser support leaf spring is located in the compressor back cavity. The advantage of this structure is that the leaf spring has large radial dimension and small stress, and the disadvantage is that the flexible phase modulator rod is slender and is easy to lose efficiency due to long-time bearing of alternating load or radial force caused by assembly problem, so the phase modulator usually adopts radial gas bearing for auxiliary support. The other structure form is as follows: the compressor piston is completely independent of the phase modulator. The structure greatly reduces the length-diameter ratio of the phase modulator rod, thereby eliminating the defect that the phase modulator rod is easy to deform and destabilize, but the size of the plate spring is limited by the size of the phase modulator, and the difficulty of design, materials and processing technology is increased.
In stirling heat engine systems, the phase modulator is primarily used to adjust the phase of the sound field within the regenerator. Therefore, in order to meet the phasing requirements, the mass of the phase modulator and the axial stiffness of the spring supporting the phase modulator must meet certain matching relationships. For a high-power Stirling heat engine, the mass and the displacement of a phase modulator are gradually increased along with the improvement of power, however, the plate spring of the phase modulator of the traditional Stirling heat engine cannot simultaneously meet the requirements of large deformation and large rigidity, so that the development of the high-power Stirling heat engine is greatly restricted.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a Stirling heat engine, which solves the problem that a phase modulator plate spring of the traditional high-power Stirling heat engine cannot meet the requirements of large deformation and large rigidity at the same time.
(II) technical scheme
In order to solve the technical problem, the invention provides a stirling heat engine, which at least comprises a heat engine shell and a gas spring phase modulator arranged in the heat engine shell, wherein the gas spring phase modulator comprises a cylinder, a flange, a first piston, a second piston and a piston bearing, the inner edge of the flange is arranged in the cylinder, the outer edge of the flange penetrates through the cylinder and is arranged outside the cylinder, and the flange divides the cylinder into the first cylinder and the second cylinder; the first piston is arranged in the first cylinder, the second piston is arranged in the second cylinder, the first piston and the second piston are connected through the piston bearing, and the flange is provided with a shaft hole for the piston bearing to pass through; a first gas cavity is formed among the first cylinder, the first piston and the flange, a second gas cavity is formed among the second cylinder, the second piston and the flange, and gas is respectively sealed in the first gas cavity and the second gas cavity to form a gas spring.
Furthermore, the flange is provided with an airflow channel which is through along the axial direction, and the airflow channel is arranged outside the air cylinder.
Further, the gas spring phase modulator also comprises an air floatation supporting structure, and the air floatation supporting structure is arranged at a gap between the shaft hole and the piston bearing.
Further, the flange include axle hole portion and with the epitaxial portion that axle hole portion is connected, axle hole portion set up in inside the cylinder, epitaxial portion passes the cylinder set up in the cylinder is outside, the shaft hole set up in axle hole portion.
Further, a first annular plate spring set is arranged in the first cylinder, an inner ring of the first annular plate spring set is connected with the shaft hole part, and an outer ring of the first annular plate spring set is connected with the first piston; and a second annular plate spring group is arranged in the second cylinder, the inner ring of the second annular plate spring group is connected with the shaft hole part, and the outer ring of the second annular plate spring group is connected with the second piston.
Furthermore, the piston bearing comprises a bearing body, the bearing body is provided with a through hole which is communicated along the axial direction, the side wall of the bearing body is provided with a throttling channel, and the throttling channel is respectively communicated with the through hole and the shaft hole; and the positions, corresponding to the through holes, of the first piston and/or the second piston are respectively provided with an opening, each opening is respectively communicated with the through holes, and a one-way valve is correspondingly arranged between each opening and the through holes.
Furthermore, the flange is provided with a high-pressure air source flow passage, the high-pressure air source flow passage is communicated with the shaft hole, and the high-pressure air source flow passage is not communicated with the airflow channel.
Furthermore, magnets are respectively arranged on the inner surface of the shaft hole and the outer surface of the piston bearing correspondingly.
Furthermore, the flange is provided with a first gas flow channel communicated with the first gas cavity, the first gas flow channel is provided with a first valve, the first gas flow channel is communicated with a first external air volume, and the first gas flow channel and the gas flow channel are not communicated with each other;
and/or the flange is provided with a second gas flow channel communicated with the second gas cavity, the second gas flow channel is provided with a second valve, the second gas flow channel is communicated with a second external empty volume, and the second gas flow channel is not communicated with the gas flow channel.
Furthermore, an expansion cavity and a back cavity are respectively arranged at the left end and the right end of the heat engine shell, a thin-walled cylinder is arranged in the heat engine shell and connected with the first piston, a radiation-proof screen is arranged inside the thin-walled cylinder, a hot end heat exchanger and a heat regenerator are respectively arranged outside the thin-walled cylinder, and a room temperature heat exchanger is arranged outside the first cylinder;
the heat engine shell is internally provided with a power rod, the left end of the power rod is in sealed sliding fit with the inner wall of the heat engine shell, a compression cavity is formed by surrounding the power rod, the heat engine shell, a second cylinder and a second piston, and the compression cavity, an airflow channel, a room temperature heat exchanger, a heat regenerator, a hot end heat exchanger and an expansion cavity are sequentially communicated;
the right end of the power rod penetrates through the power piston, and a permanent magnet is installed on the inner wall of the heat engine shell at a position corresponding to the power piston.
(III) advantageous effects
The technical scheme of the invention has the following advantages:
the Stirling heat engine provided by the invention has the advantages that the cylinder is divided into the first cylinder and the second cylinder through the flange, the first gas cavity is formed among the first cylinder, the first piston and the flange, the second gas cavity is formed among the second cylinder, the second piston and the flange, gas is respectively sealed in the first gas cavity and the second gas cavity to form the gas spring, and the restoring force of the reciprocating motion of the first piston and the second piston can be adjusted by changing the gas volume between the first gas cavity and the second gas cavity. Compared with the traditional Stirling heat engine, the Stirling heat engine provided by the invention has the advantages that the gas spring phase modulator is adopted to replace the traditional plate spring structure phase modulator, so that the gas spring phase modulator can obtain enough rigidity and deformation during phase modulation, and the phase modulation requirement of the high-power Stirling heat engine is further met.
Drawings
FIG. 1 is a schematic diagram of the construction of a Stirling heat engine according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a Stirling heat engine according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the construction of a three Stirling heat engine according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the construction of a fifth stirling heat engine according to a fourth and fifth embodiment of the present invention;
FIG. 5 is a schematic diagram of the construction of a six Stirling heat engine according to an embodiment of the present invention;
fig. 6 is a schematic structural view of a seven stirling system in accordance with an embodiment of the present invention.
In the figure: 1: an expansion chamber; 2: a hot end heat exchanger; 3: a heat regenerator; 4: a gas spring phase modulator; 5: a room temperature heat exchanger; 6: a compression chamber; 7: a permanent magnet; 8: a power piston; 9: opening a hole; 10: a back cavity; 13: a power rod; 14: a flange; 15A: a first cylinder; 15B: a second cylinder; 16A: a first piston; 16B: a second piston; 17: a piston bearing; 18: a shaft hole; 19: a thin-walled cylinder; 20: a radiation-proof screen; 21: an air flow channel; 22A: a first annular plate spring; 22B: a second annular plate spring; 23: a one-way valve; 24: a throttling channel; 25: a magnet; 26: an air source flow channel; 27: a first gas flow path; 28: a first ambient air volume; 29: a second gas flow channel; 30: a second ambient air volume.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1-5, the present invention provides a stirling heat engine comprising at least a heat engine housing and a gas spring phase modulator 4 disposed in the heat engine housing. The gas spring phaser 4 includes a cylinder, a flange 14, a first piston 16A, a second piston 16B, and a piston bearing 17.
The inner edge of the flange 14 is arranged inside the cylinder, the outer edge of the flange 14 penetrates through the cylinder and is arranged outside the cylinder, and the flange 14 divides the cylinder into a first cylinder 15A and a second cylinder 15B.
The first piston 16A is disposed in the first cylinder 15A, the second piston 16B is disposed in the second cylinder 15B, the first piston 16A and the second piston 16B are connected by a piston bearing 17, and the flange 14 is provided with a shaft hole 18 through which the piston bearing 17 passes.
A first gas chamber is formed among the first cylinder 15A, the first piston 16A and the flange 14, a second gas chamber is formed among the second cylinder 15B, the second piston 16B and the flange 14, and gas is sealed in the first gas chamber and the second gas chamber respectively, so that a gas spring is formed. Since the stiffness of the gas spring is mainly determined by the gas volume and the piston area, different spring rates can be obtained by appropriately designing these two parameters.
The application during stirling heat engine during operation, through changing the gas volume between first gas chamber and the second gas chamber, perhaps through changing first piston 16A and second piston 16B's area, can adjust first piston 16A and second piston 16B reciprocating motion's restoring force to make gas spring phase modulator 4 can obtain big enough rigidity and deformation when the phase modulation, and then satisfy the phase modulation demand of high-power stirling heat engine.
The stirling heat engine described herein is illustrated by the following specific examples.
Example one
As shown in fig. 1, the stirling heat engine according to this embodiment includes a heat engine casing, and an expansion cavity 1, a hot-end heat exchanger 2, a heat regenerator 3, a gas spring phase modulator 4, a room temperature heat exchanger 5, a compression cavity 6, a permanent magnet 7, a power piston 8, a back cavity 10, a power rod 13, a thin-walled cylinder 19, and a radiation-proof screen 20 are respectively disposed in the heat engine casing. The expansion chamber 1 and the back chamber 10 are respectively arranged at the left and right ends of the heat engine casing.
The gas spring phaser 4 includes a cylinder, a flange 14, a first piston 16A, a second piston 16B, and a piston bearing 17.
The inner edge of the flange 14 is arranged inside the cylinder, the outer edge of the flange 14 penetrates through the cylinder and is arranged outside the cylinder, and the flange 14 divides the cylinder into a first cylinder 15A and a second cylinder 15B.
The first piston 16A is disposed in the first cylinder 15A, the second piston 16B is disposed in the second cylinder 15B, the first piston 16A and the second piston 16B are connected by a piston bearing 17, and the flange 14 is provided with a shaft hole 18 through which the piston bearing 17 passes. A first gas chamber is formed among the first cylinder 15A, the first piston 16A and the flange 14, a second gas chamber is formed among the second cylinder 15B, the second piston 16B and the flange 14, and gas is sealed in the first gas chamber and the second gas chamber respectively, so that a gas spring is formed.
The first piston 16A and the first cylinder 15A, the second piston 16B and the second cylinder 15B, and the piston bearing 17 and the shaft hole 18 are disposed in a gap-sealed manner. That is, the first piston 16A is in sliding sealing engagement with the first cylinder 15A, the second piston 16B is in sliding sealing engagement with the second cylinder 15B, and the piston bearing 17 is in sliding sealing engagement with the shaft hole 18.
Specifically, the flange 14 is provided with an air flow channel 21 that passes through in the axial direction, the air flow channel 21 being provided outside the cylinder, and the air flow channel 21 being provided in the heat engine casing.
Specifically, the flange 14 includes a shaft hole portion provided inside the cylinder and an outer extension portion connected to the shaft hole portion, the outer extension portion being provided outside the cylinder through the cylinder wall, and the shaft hole 18 being provided in the shaft hole portion.
Specifically, the thin-walled cylinder 19 is connected to the first piston 16A, and the radiation shielding screen 20 is disposed inside the thin-walled cylinder 19. The thin-wall cylinder 19 plays a role in thermal buffering, and no-flow gas is arranged in the thin-wall cylinder 19, so that the heat conductivity coefficient is low. By arranging one or more layers of radiation-proof screens 20 in the thin-walled cylinder 19, the radiation heat transfer between the upper end face of the thin-walled cylinder 19 and the first piston 16A can be reduced, and the internal gas of the thin-walled cylinder 19 can be divided into a plurality of areas, so that the mixing of cold and hot air flows is reduced, and the loss is reduced.
Specifically, the hot-end heat exchanger 2 and the regenerator 3 are sequentially arranged outside the thin-walled cylinder 19 from left to right, and the room-temperature heat exchanger 5 is arranged outside the first cylinder 15A.
Specifically, the left end of the power rod 13 is in sealing sliding fit with the inner wall of the heat engine shell, the power rod 13, the heat engine shell, the second cylinder 15B and the second piston 16B are surrounded to form the compression cavity 6, and the compression cavity 6, the airflow channel 21, the room temperature heat exchanger 5, the heat regenerator 3, the hot end heat exchanger 2 and the expansion cavity 1 are sequentially communicated.
Specifically, the right end of the power rod 13 passes through the power piston 8, and the permanent magnet 7 is fixedly installed on the inner wall of the heat engine casing at a position corresponding to the power piston 8. When the power rod 13 moves, the power piston 8 can be driven to move along with the power rod, and then the coil is driven to cut the magnetic induction line.
Specifically, a wear-resistant material may be coated between the piston bearing 17 and the shaft hole 18, so that the piston bearing 17 and the shaft hole 18 are worn away when sliding, thereby prolonging the service life.
When the stirling heat engine described in this embodiment is charged, the working medium sequentially enters the room temperature heat exchanger 5, the heat regenerator 3, the hot end heat exchanger 2, and the expansion chamber 1 from the compression chamber 6 through the airflow channel 21.
When the stirling heat engine works, the gas volume or area between the first gas cavity and the second gas cavity is changed, so that the restoring force of the reciprocating motion of the first piston 16A and the second piston 16B can be adjusted, the power rod 13 is driven to reciprocate, the power rod 13 drives the power piston 8 to move along with the reciprocating motion, and then the coil is driven to cut the magnetic induction line.
The Stirling heat engine described in this embodiment adopts gas spring phase modulator 4 to replace traditional leaf spring structure phase modulator to make gas spring phase modulator 4 can obtain big enough rigidity and deformation when the phase modulation, and then satisfy the phase modulation demand of high-power Stirling heat engine.
Example two
As shown in fig. 2, the structure of the stirling heat engine according to the present embodiment is substantially the same as that of the first embodiment, and only the structure of the gas spring phase modulator is different.
In the present embodiment, the first cylinder 15A is provided with a first annular plate spring group 22A, an inner ring of the first annular plate spring group 22A is connected to the axial hole portion of the flange 14, and an outer ring of the first annular plate spring group 22A is connected to the first piston 16A. The second cylinder 15B is provided therein with a second annular plate spring group 22B, an inner ring of the second annular plate spring group 22B is connected to the shaft hole portion of the flange 14, and an outer ring of the second annular plate spring group 22B is connected to the second piston 16B.
The first annular plate spring group 22A and the second annular plate spring group 22B are formed by stacking one or more plate springs, and the number of the plate springs can be set according to actual use requirements.
By providing the first annular plate spring group 22A and the second annular plate spring group 22B, it is possible to provide axial restoring force to the piston bearing and radial support to the piston bearing, and it is possible to maintain the clearance between the piston bearing and the shaft hole on the order of 10 μm.
Since the stirling heat engine according to the present embodiment employs the gas spring phase modulator for phase modulation, the first and second annular leaf springs 22A and 22B do not act as a primary supplier of the restoring force, the first and second annular leaf springs 22A and 22B do not need to provide a large axial stiffness, and the thickness of the first and second annular leaf springs 22A and 22B can be greatly reduced.
The stirling heat engine of this embodiment through set up first annular leaf spring 22A and second annular leaf spring 22B in the gas spring phase modulation ware, compare with embodiment one the stirling heat engine, this embodiment can produce bigger axial deformation when the phase modulation, makes piston bearing can obtain bigger axial displacement when moving to satisfy the demand of phase modulation.
EXAMPLE III
As shown in fig. 3, the structure of the stirling heat engine according to the present embodiment is substantially the same as that of the first embodiment, and only the structure of the gas spring phase modulator is different.
In the present embodiment, the piston bearing 17 includes a bearing body provided with a through hole penetrating in the axial direction, that is, the piston bearing 17 adopts a hollow structure.
The side wall of the bearing body is provided with a throttling channel 24, and the throttling channel 24 is respectively communicated with the shaft hole 18 and the through hole.
Specifically, the first piston 16A and the second piston 16B may be provided with openings 9 at positions corresponding to the through holes, respectively, so that the openings 9 communicate with the through holes, respectively, and the check valves 23 may be provided between the openings 9 and the through holes, respectively.
The openings 9 may be provided only at positions corresponding to the through holes in the first piston 16A, the openings 9 may be communicated with the through holes, respectively, and the check valve 23 may be provided between the openings 9 and the through holes.
It is also possible to provide the openings 9 only at positions corresponding to the through holes on the second piston 16B, so that the openings 9 communicate with the through holes, respectively, and to provide the check valves 23 between the openings 9 and the through holes.
In this embodiment, the opening 9 is formed in the second piston 16B, and the check valve 23 is disposed between the opening 9 and the through hole, when the stirling heat engine described in this embodiment operates, the pressure of the gas on the surface sides of the first piston 16A and the second piston 16B may periodically change due to the action of the sound wave, when the pressure rises to a certain value, the check valve 23 is opened, the airflow in the compression cavity enters the through hole of the piston bearing 17 through the opening 9, an air source with higher pressure is formed in the through hole, and the air source enters the gap between the piston bearing 17 and the shaft hole 18 through the throttling channel 24, so as to form an air-floating support structure, and further achieve the effect of supporting the piston bearing 17.
Example four
As shown in fig. 4, the structure of the stirling heat engine according to the present embodiment is substantially the same as that of the first embodiment, and only the structure of the gas spring phase modulator is different.
In this embodiment, the flange 14 is provided with a gas supply passage 26, and the gas supply passage 26 is communicated with the shaft hole 18. The air supply passage 26 and the air flow passage 21 are not communicated with each other.
When the stirling heat engine described in this embodiment is in operation, the high-pressure air source can be generated in other manners, and the high-pressure air source is injected into the gap between the shaft hole 18 and the piston bearing 17 through the air source flow passage 26, so that an air-floating support structure is formed, and the effect of supporting the piston bearing 17 is achieved.
EXAMPLE five
As shown in fig. 4, the structure of the stirling heat engine according to this embodiment is substantially the same as that of the above embodiments, and only the structure of the gas spring phase modulator is different.
In this embodiment, the inner surface of the shaft hole 18 and the outer surface of the piston bearing 17 are respectively provided with a magnet 25, and the magnets 25 are attracted to each other to provide a restoring force for the piston bearing 17, so that the movement of the piston bearing 17 is always kept at a preset equilibrium position.
EXAMPLE six
As shown in fig. 5, the structure of the stirling heat engine according to the present embodiment is substantially the same as that of the first embodiment, and only the structure of the gas spring phase modulator is different.
In practical design, there is sometimes a problem of excessive phase modulation stiffness of the gas spring phase modulator, so in this embodiment, the first structural form of the gas spring phase modulator is that a first gas flow passage 27 communicating with the first gas chamber is provided on the flange 14, the first gas flow passage 27 is provided with a first valve (not shown), the first gas flow passage 27 communicates with the first external empty volume 28, and the first gas flow passage 27 does not communicate with the gas flow channel 21. Meanwhile, a second gas flow passage 29 communicating with the second gas chamber is provided on the flange 14, the second gas flow passage 29 is provided with a second valve (not shown), the second gas flow passage 29 communicates with the second outer empty volume 30, and the second gas flow passage 29 does not communicate with the gas flow passage 21.
When the gas spring phase modulator is used, the first gas cavity is communicated with the first external empty volume 28 and the second gas cavity is communicated with the second external empty volume 30 by respectively adjusting the opening degrees of the first valve and the second valve, so that the aim of adjusting the phase modulation rigidity of the gas spring phase modulator is fulfilled.
The second structure form of the gas spring phase adjuster in this embodiment is that only the flange 14 is provided with the first gas flow passage 27 communicated with the first gas chamber, the first gas flow passage 27 is provided with the first valve, so that the first gas flow passage 27 is communicated with the first external empty volume 28, and the first gas flow passage 27 is not communicated with the gas flow channel 21.
When in use, the first gas cavity is communicated with the first external empty volume 28 by adjusting the opening degree of the first valve, thereby achieving the purpose of adjusting the phase modulation rigidity of the gas spring phase modulator.
In the third structural form of the gas spring phase adjuster in this embodiment, a second gas flow passage 29 communicated with the second gas chamber is only arranged on the flange 14, and a second valve is arranged on the second gas flow passage 29, so that the second gas flow passage 29 is communicated with a second external empty volume 30, and the second gas flow passage 29 is not communicated with the gas flow channel 21.
When the gas spring phase modulator is used, the second gas cavity is communicated with the second outer empty volume 30 by adjusting the opening degree of the second valve, so that the aim of adjusting the phase modulation rigidity of the gas spring phase modulator is fulfilled.
EXAMPLE seven
The present embodiment provides a stirling system comprising one or more sets of thermo-acoustic phase modulating assemblies, each set of thermo-acoustic phase modulating assemblies comprising two thermo-acoustic sections and a first phase modulator 4A mounted between the two thermo-acoustic sections, and each thermo-acoustic section comprising a second phase modulator 4B.
As shown in fig. 6, the stirling system in this embodiment comprising a set of thermo-acoustic phase modulation assemblies will be described in detail below.
As for one first condenser 4A and two second condensers 4B in the present embodiment, the gas spring condensers described in any of the first to sixth embodiments may be employed for all of them. Or one of the three parts may adopt the gas spring phase modulator described in any one of the first to sixth embodiments, and the other two parts adopt the existing conventional phase modulators. One of the three can adopt the existing phase modulator with the conventional structure, and the other two adopt the gas spring phase modulators described in any one of the first to sixth embodiments. That is, in the same stirling system, the gas spring phase modulator described herein may be used in its entirety, or in combination with existing conventional configurations.
When the first phase modulator 4A and the two second phase modulators 4B in this embodiment both adopt the gas spring phase modulator described in any one of the first to sixth embodiments, when the stirling system is in operation, the thermo-acoustic member located on the left side serves as an engine, heat is input into the hot-end heat exchanger in the thermo-acoustic member located on the left side, and the acoustic work generated by the thermo-acoustic member located on the left side is transmitted to the thermo-acoustic member located on the right side through the first phase modulator 4A and is consumed in the thermo-acoustic member located on the right side, thereby generating the effect of pumping heat or cooling. The first phase modulator 4A can perform both a phase modulation function and an acoustic power matching function.
In summary, the stirling heat engine according to the embodiment of the present invention adopts the gas spring phase modulator to replace the conventional plate spring structure phase modulator, so that the gas spring phase modulator can obtain sufficient rigidity and deformation during phase modulation, and further meet the phase modulation requirement of the high-power stirling heat engine.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, unless otherwise specified, "a plurality" means one or more; "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A stirling heat engine, characterized by: the phase modulator at least comprises a heat engine shell and a gas spring phase modulator arranged in the heat engine shell, wherein the gas spring phase modulator comprises a cylinder, a flange, a first piston, a second piston and a piston bearing, the inner edge of the flange is arranged in the cylinder, the outer edge of the flange penetrates through the cylinder and is arranged outside the cylinder, and the flange divides the cylinder into a first cylinder and a second cylinder; the first piston is arranged in the first cylinder, the second piston is arranged in the second cylinder, the first piston and the second piston are connected through the piston bearing, and the flange is provided with a shaft hole for the piston bearing to pass through; a first gas cavity is formed among the first cylinder, the first piston and the flange, a second gas cavity is formed among the second cylinder, the second piston and the flange, and gas is respectively sealed in the first gas cavity and the second gas cavity to form a gas spring.
2. A stirling engine according to claim 1, wherein: the flange is provided with an airflow channel which is through along the axial direction, and the airflow channel is arranged outside the air cylinder.
3. A stirling engine according to claim 2, wherein: the gas spring phase modulator further comprises an air floatation supporting structure, and the air floatation supporting structure is arranged at a gap between the shaft hole and the piston bearing.
4. A stirling engine according to claim 1, wherein: the flange include axle hole portion and with the epitaxial portion that axle hole portion is connected, axle hole portion set up in inside the cylinder, epitaxial portion passes the cylinder set up in the cylinder is outside, the shaft hole set up in axle hole portion.
5. A Stirling heat engine according to claim 4, wherein: a first annular plate spring group is arranged in the first cylinder, an inner ring of the first annular plate spring group is connected with the shaft hole part, and an outer ring of the first annular plate spring group is connected with the first piston; and a second annular plate spring group is arranged in the second cylinder, the inner ring of the second annular plate spring group is connected with the shaft hole part, and the outer ring of the second annular plate spring group is connected with the second piston.
6. A stirling engine according to claim 1, wherein: the piston bearing comprises a bearing body, the bearing body is provided with a through hole which is communicated along the axial direction, the side wall of the bearing body is provided with a throttling channel, and the throttling channel is respectively communicated with the through hole and the shaft hole; and the positions, corresponding to the through holes, of the first piston and/or the second piston are respectively provided with an opening, each opening is respectively communicated with the through holes, and a one-way valve is correspondingly arranged between each opening and the through holes.
7. A stirling engine according to claim 3, wherein: the flange is provided with a high-pressure air source flow passage, the high-pressure air source flow passage is communicated with the shaft hole, and the high-pressure air source flow passage is not communicated with the airflow passage.
8. A stirling engine according to claim 1, wherein: and magnets are respectively and correspondingly arranged on the inner surface of the shaft hole and the outer surface of the piston bearing.
9. A stirling engine according to claim 3, wherein: the flange is provided with a first gas flow channel communicated with the first gas cavity, the first gas flow channel is provided with a first valve, the first gas flow channel is communicated with a first external air volume, and the first gas flow channel is not communicated with the gas flow channel;
and/or the flange is provided with a second gas flow channel communicated with the second gas cavity, the second gas flow channel is provided with a second valve, the second gas flow channel is communicated with a second external empty volume, and the second gas flow channel is not communicated with the gas flow channel.
10. A stirling engine according to claim 2, wherein: the heat engine comprises a heat engine shell, a first piston, a first air cylinder, a second air cylinder, a heat-end heat exchanger, a back cavity, a radiation-proof screen, a hot-end heat exchanger and a heat regenerator, wherein the left end and the right end of the heat engine shell are respectively provided with an expansion cavity and the back cavity;
the heat engine shell is internally provided with a power rod, the left end of the power rod is in sealed sliding fit with the inner wall of the heat engine shell, a compression cavity is formed by surrounding the power rod, the heat engine shell, a second cylinder and a second piston, and the compression cavity, an airflow channel, a room temperature heat exchanger, a heat regenerator, a hot end heat exchanger and an expansion cavity are sequentially communicated;
the right end of the power rod penetrates through the power piston, and a permanent magnet is installed on the inner wall of the heat engine shell at a position corresponding to the power piston.
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| CN201910166999.XA CN109882310B (en) | 2019-03-06 | 2019-03-06 | Stirling heat engine |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114688755B (en) * | 2020-12-28 | 2024-09-17 | 中国科学院理化技术研究所 | Thermally driven Stirling refrigeration system |
| CN114370352B (en) * | 2021-05-26 | 2024-03-26 | 中国科学院理化技术研究所 | Free piston Stirling heat engine air-float piston structure |
| CN114370353B (en) * | 2021-07-09 | 2023-10-24 | 中国科学院理化技术研究所 | Free piston Stirling heat engine phase modulator mechanism |
| CN114458472B (en) * | 2022-01-10 | 2024-04-05 | 中国科学院理化技术研究所 | Free piston Stirling generator |
| CN116753636B (en) * | 2023-08-18 | 2023-11-07 | 苏州华冷科技有限公司 | Integrated free piston Stirling refrigerator device |
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