CN116591854A - Free piston linear generator for coupling Stirling heat engine - Google Patents
Free piston linear generator for coupling Stirling heat engine Download PDFInfo
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- CN116591854A CN116591854A CN202310635904.0A CN202310635904A CN116591854A CN 116591854 A CN116591854 A CN 116591854A CN 202310635904 A CN202310635904 A CN 202310635904A CN 116591854 A CN116591854 A CN 116591854A
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- 230000008878 coupling Effects 0.000 title claims abstract description 28
- 238000010168 coupling process Methods 0.000 title claims abstract description 28
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 28
- 238000007906 compression Methods 0.000 claims abstract description 17
- 230000006835 compression Effects 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 31
- 229910052802 copper Inorganic materials 0.000 claims description 22
- 239000010949 copper Substances 0.000 claims description 22
- 230000006698 induction Effects 0.000 claims description 6
- 229910001004 magnetic alloy Inorganic materials 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 4
- 239000000696 magnetic material Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 7
- 230000005674 electromagnetic induction Effects 0.000 abstract description 3
- 230000005415 magnetization Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
Classifications
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- 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
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- 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
- F02G2280/00—Output delivery
- F02G2280/10—Linear generators
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The application relates to the technical field of linear generators, in particular to a free piston linear generator for coupling a Stirling heat engine, which comprises a cylinder body, a power piston, a rotor assembly, a stator assembly and a flat plate spring, wherein: the power piston is arranged in the middle of the cylinder body and divides the inner area of the cylinder body into a compression cavity and a back pressure cavity; two groups of flat plate springs are arranged; the rotor assembly and the stator assembly are arranged between the two groups of flat plate springs, and the stator assembly is arranged on the outer side of the rotor assembly; the rotor assembly is arranged in the back pressure cavity and is connected with the rod part of the power piston through the support frame, and the stator assembly is arranged between the inner wall and the outer wall of the cylinder body and is separated from the back pressure cavity. The application adopts the arrangement mode of double coils and double permanent magnets, has high electromechanical conversion efficiency, greatly reduces or even zero radial resultant force of electromagnetic force generated by electromagnetic induction on the rotor assembly in the running process of the rotor assembly, and improves the reliability and service life of the gap seal between the power piston and the cylinder body.
Description
Technical Field
The application relates to the technical field of linear generators, in particular to a free piston linear generator for coupling a Stirling heat engine.
Background
The free piston Stirling heat engine as an external combustion type thermoelectric conversion device has the following advantages: the heat efficiency of Stirling cycle is close to the Carnot efficiency in working, and the conversion efficiency from heat energy to mechanical energy is high; the external combustion type heat engine can adapt to the diversity supply of heat sources and has the characteristic of a heat source; the internal working medium is hydrogen or helium, so that the method is environment-friendly and pollution-free; the free piston type structure has the advantages that the moving piston is in pneumatic coupling, the structure is simple and compact, and the reliability is high. Therefore, the free piston Stirling generator coupled by the linear generator and the Stirling heat engine is used as an optional power supply technical scheme, and has wide application prospect in the technical field of thermoelectric conversion by using isotopes and nuclear energy as heat sources, such as deep space exploration, mars landing, interstar navigation and the like.
The linear generator for coupling the Stirling heat engine mainly has a moving iron type, a moving coil type and a moving magnetic type. The moving iron type linear generator is less in use because of the heavy weight of the rotor and low electromechanical conversion efficiency; the coil of the moving coil type linear generator is used as a moving part and is positioned in the machine, and the coil outgoing line is led out of the machine, so that the manufacturing process is complex, and the fatigue problem exists in the coil, thereby the reliability is poor and the service life is short; the moving-magnet linear generator is a preferred linear generator for coupling the Stirling heat engine because of the characteristics of high electromechanical conversion efficiency, light mover weight and the like.
At present, a moving-magnet linear generator for Stirling heat engine coupling is mostly of a single-group coil type and a single-group permanent magnet type, and has low electromechanical conversion efficiency; the permanent magnet is a moving part and is formed by splicing a plurality of tiles into a ring shape, and the manufacturing process is complex and has poor reliability; the radial force unbalance is remarkable due to the inconsistency of tile magnetism and the difference of assembly precision, the technical requirement on gap seal support of a piston is high, and the service life is short. Thus limiting the technical advantages of high efficiency, reliability, long life of the spatial free piston Stirling generator.
Disclosure of Invention
The application provides a free piston linear generator for coupling a Stirling heat engine, which adopts a double-permanent magnet and double-coil moving magnetic structure and solves the problems of low power density, poor reliability, short service life and complex manufacturing process of the linear generator for coupling the Stirling heat engine.
In order to achieve the above object, the present application provides a free piston linear generator for coupling a stirling heat engine, comprising a cylinder, a power piston, a mover assembly, a stator assembly and a flat plate spring, wherein: the power piston is arranged in the middle of the cylinder body and divides the inner area of the cylinder body into a compression cavity and a back pressure cavity; the head of the power piston is positioned in the compression cavity and seals the compression cavity from the back pressure cavity, and the rod part of the power piston is positioned in the back pressure cavity; the flat plate springs are arranged in two groups, one group is arranged between the top end of the power piston rod part and the inner wall of the cylinder body, and the other group is arranged between the tail end of the power piston rod part and the inner wall of the cylinder body; the rotor assembly and the stator assembly are arranged between the two groups of flat plate springs, and the stator assembly is arranged on the outer side of the rotor assembly; the rotor assembly is arranged in the back pressure cavity and is connected with the rod part of the power piston through the support frame, and the stator assembly is arranged between the inner wall and the outer wall of the cylinder body and is separated from the back pressure cavity.
Further, the mover assembly includes an inner yoke, a first permanent magnet, and a second permanent magnet, wherein: the first permanent magnet and the second permanent magnet are arranged on the outer circle of the inner yoke; the inner yoke is of a ring structure, and the material is a soft magnetic alloy with high saturation magnetic induction intensity; the first permanent magnet and the second permanent magnet are of circular ring structures, and the materials are soft magnetic materials.
Further, the first permanent magnet and the second permanent magnet are magnetized by annular radiation, and the magnetization directions are opposite.
Further, the stator assembly includes a first coil slot, a first coil, a second coil slot, a second coil, an outer yoke, and an outgoing line port, wherein: the first coil groove and the second coil groove are of annular structures and are arranged between the inner wall and the outer wall of the cylinder body; the first coil is arranged in the first coil groove, and the second coil is arranged in the second coil groove; the outer yoke is arranged on the outer sides of the first coil and the second coil, and is made of high-saturation magnetic induction intensity soft magnetic alloy; the lead-out wire mouth is arranged at the joint of the first coil groove and the cylinder body.
Further, the first coil and the second coil are wound by the same round enamelled copper wire or flat enamelled copper wire.
Further, the number of layers of the first coil and the second coil is the same as the number of turns of each layer, and the number of layers is an even number more than or equal to 2.
Further, when the odd layers of coils are wound, copper wires are led in from the lead-out wire ports, are closely arranged in the same direction along the circumference in the first coil groove and are wound neatly, and after the copper wires are wound on the first coil groove, the copper wires are led into the second coil groove and are wound along the opposite circumferential direction of the first coil groove until the copper wires are wound neatly.
Further, when the even number of the coils is wound, the copper wires are tightly arranged in the second coil groove along the same circumferential direction and wound neatly, after the second coil groove is fully wound by the copper wires, the copper wires are led into the first coil groove and wound along the circumferential direction opposite to the circumferential direction of the second coil groove until the copper wires are fully wound neatly, and then the copper wires are led out from the lead-out wire opening.
Further, the first coil is arranged opposite to the first permanent magnet, and the second coil is arranged opposite to the second permanent magnet.
Further, the rotor component and the stator component are both provided with two groups, and the power pistons along the axial direction are in symmetrical structures.
The free piston linear generator for coupling the Stirling heat engine has the following beneficial effects:
1. the application adopts the arrangement mode of double coils and double permanent magnets, has high electromechanical conversion efficiency, greatly reduces or even zero radial resultant force of electromagnetic force generated by electromagnetic induction on the rotor assembly in the running process of the rotor assembly, and improves the reliability and service life of the gap seal between the power piston and the cylinder body.
2. The rotor assembly is positioned at the center of the flat spring, so that the mass center of the rotor assembly is close to the center of the axial position of the flat spring, and the rotor assembly is stably supported and stably operated by the free piston configuration.
3. The permanent magnet in the rotor component adopts annular radiation for magnetizing, so that the processing difficulty is reduced, the assembly precision is improved, the consistency of the magnetic performance in the circumferential direction is ensured, and the problem of lateral force caused by nonuniform magnetizing is reduced.
4. The coil in the stator assembly is completely outside the back pressure cavity, so that the problems of insulation and high-pressure sealing when the coil outgoing line leads to the outer wall from the back pressure cavity are solved, the complexity of the manufacturing process is reduced, and the reliability is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application. In the drawings:
FIG. 1 is a schematic structural view of a free piston linear generator for coupling a Stirling heat engine provided in accordance with an embodiment of the application;
FIG. 2 is a schematic diagram of the magnetization direction of a free piston linear generator permanent magnet for coupling a Stirling heat engine provided in accordance with an embodiment of the application;
FIG. 3 is a schematic diagram of an odd-layer coil winding scheme for a free-piston linear generator for coupling a Stirling heat engine, according to an embodiment of the application;
FIG. 4 is a schematic illustration of an even-layered coil winding for a free-piston linear generator for coupling a Stirling heat engine, according to an embodiment of the application;
FIG. 5 is a schematic diagram of the stresses during operation of a free piston linear generator for coupling a Stirling heat engine (the power piston to the right of the equilibrium position) provided in accordance with an embodiment of the application;
in the figure: 1-cylinder body, 11-compression chamber, 12-back pressure chamber, 2-power piston, 3-rotor subassembly, 31-inner yoke, 32-first permanent magnet, 33-second permanent magnet, 4-stator subassembly, 41-first coil groove, 42-first coil, 43-second coil groove, 44-second coil, 45-outer yoke, 46-lead-out wire mouth, 5-flat spring, 6-support frame.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the present application provides a free piston linear generator for coupling a stirling heat engine comprising a cylinder 1, a power piston 2, a mover assembly 3, a stator assembly 4 and a flat plate spring 5, wherein: the power piston 2 is arranged in the middle of the cylinder body 1 and divides the inner area of the cylinder body 1 into a compression cavity 11 and a back pressure cavity 12; the head of the power piston 2 is positioned in the compression chamber 11 and seals the compression chamber 11 from the back pressure chamber 12, and the rod part of the power piston 2 is positioned in the back pressure chamber 12; the flat plate springs 5 are arranged in two groups, one group is arranged between the top end of the rod part of the power piston 2 and the inner wall of the cylinder body 1, and the other group is arranged between the tail end of the rod part of the power piston 2 and the inner wall of the cylinder body 1; the rotor assembly 3 and the stator assembly 4 are arranged between the two groups of flat plate springs 5, and the stator assembly 4 is arranged on the outer side of the rotor assembly 3; the rotor assembly 3 is arranged in the back pressure cavity 12, is connected with the rod part of the power piston 2 through the support frame 6, and the stator assembly 4 is arranged between the inner wall and the outer wall of the cylinder body 1 and is separated from the back pressure cavity 12.
Specifically, the free piston linear generator for coupling the Stirling heat engine provided by the embodiment of the application adopts the double-permanent-magnet rotor assembly 3 and the double-coil stator assembly 4 to work in a matched manner, is arranged between the plane plate springs 5, and forms the free piston linear generator together with the cylinder body 1 and the power piston 2, so that the free piston linear generator has the advantages of simple structure, easiness in manufacturing, stable operation, high thermoelectric conversion efficiency, and great improvement on the reliability and service life of the generator. The power piston 2 is arranged in the middle of the cylinder body 1, the inner area of the cylinder body 1 is divided into a compression cavity 11 and a back pressure cavity 12, a joint annular gap between the power piston 2 and the cylinder body 1 is a dynamic gap sealing surface, the compression cavity 11 and the back pressure cavity 12 can be sealed and separated by the head of the power piston 2, and when the power piston 2 works, the power piston 2 is pneumatically coupled with the Stirling heat engine through the compression cavity 11, so that linear motion can be performed in the cylinder body 1; the rotor assembly 3 is connected with the power piston 2 through a support frame 6 and can move along with the power piston 2; the stator assembly 4 is fixedly arranged between the inner wall and the outer wall of the cylinder body 1, and when in operation, the stator assembly 4 can generate induced electromotive force along with the relative movement of the rotor assembly 3, so that the conversion from mechanical energy to electric energy is realized; the flat plate spring 5 is mainly used for providing proper radial supporting force and axial restoring force for the power piston 2, so that the joint annular clearance surface of the head of the power piston 2 and the cylinder body 1 is dynamic clearance seal, and restoring force for driving the mover assembly 3 to axially reciprocate in a linear manner can be provided for the power piston 2.
Further, the mover assembly 3 includes an inner yoke 31, a first permanent magnet 32, and a second permanent magnet 33, wherein: the first permanent magnet 32 and the second permanent magnet 33 are mounted on the outer circle of the inner yoke 31; the inner yoke 31 is of a ring structure, and is made of soft magnetic alloy with high saturation induction intensity; the first permanent magnet 32 and the second permanent magnet 33 are both in a circular ring structure, and the materials are all soft magnetic materials. The inner yoke 31 is connected with the power piston 2 through the support frame 6, two permanent magnets are arranged on the outer circle of the inner yoke 31, and the permanent magnets adopt a circular ring structure, so that the processing difficulty is reduced, the assembly precision is improved, and the lateral force caused by the dimensional precision is reduced. The first permanent magnet 32 and the second permanent magnet 33 are mainly used for providing two permanent magnetic fields with opposite polarities, and the inner yoke 31 is arranged so that the two magnetic fields with opposite polarities flow through the inner yoke 31 inside the permanent magnets to form a closed magnetic circuit, thereby reducing magnetic gap magnetic circuit loss. In operation, with the movement of the power piston 2, the first permanent magnet 32 and the second permanent magnet 33 will also move, so as to cut magnetic lines of force.
Further, as shown in fig. 2, the magnetization modes of the first permanent magnet 32 and the second permanent magnet 33 are annular radiation magnetization, and the magnetization directions are opposite, so that consistency of magnetic properties in the circumferential direction is ensured, and the problem of lateral force caused by uneven magnetization is reduced.
Further, the stator assembly 4 includes a first coil groove 41, a first coil 42, a second coil groove 43, a second coil 44, an outer yoke 45, and an outgoing line port 46, wherein: the first coil groove 41 and the second coil groove 43 are both annular structures and are arranged between the inner wall and the outer wall of the cylinder body 1; the first coil 42 is disposed in the first coil groove 41, and the second coil 44 is disposed in the second coil groove 43; the outer yoke 45 is arranged outside the first coil 42 and the second coil 44, and is made of high-saturation magnetic induction soft magnetic alloy; the lead-out wire port 46 is provided at the junction of the first coil groove 41 and the cylinder 1. The stator assembly 4 is arranged between the inner wall and the outer wall of the cylinder body 1, is integrally positioned between the two groups of flat plate springs 5 and is arranged on the outer side of the rotor assembly 3, the coil is wound and fixed through the coil groove, and is completely positioned outside the back pressure cavity 12, so that the problems of insulation, high-pressure sealing and the like when the coil outgoing line is led out from the back pressure cavity 12 to the outer wall are solved. The outer yoke 45 functions similarly to the inner yoke 31 so that two magnetic fields of opposite polarities flow through the outer yoke 45 outside the permanent magnets to form a closed magnetic circuit to reduce the magnetic gap loss. When the rotor assembly 3 works, the rotor assembly 3 moves along with the power piston 2 in an axial reciprocating mode, so that the rotor assembly 3 and the stator assembly 4 move relatively, induced electromotive force is generated in the first coil 42 and the second coil 44, and because the winding directions of the same layer of coils of the first coil 42 and the second coil 44 are opposite, and the polarities of the first permanent magnet 32 and the second permanent magnet 33 are opposite, the current directions in the first coil 43 and the second coil 44 are the same, electric energy is output, and conversion from mechanical energy to electric energy is achieved.
Further, the first coil 42 and the second coil 44 are wound from the same round enameled copper wire or flat enameled copper wire.
Further, the number of layers of the first coil 42 and the second coil 44 is the same as the number of turns per layer, and the number of layers is an even number of not less than 2.
Further, as shown in fig. 3, when winding the odd layers of coils, copper wires are led from the lead-out wire ports 46, are closely arranged in the same circumferential direction in the first coil grooves 41 and are wound in order, and after the copper wires are wound in the first coil grooves 41, the copper wires are led into the second coil grooves 43 and are wound in the opposite circumferential direction to the first coil grooves 41 until the copper wires are wound in order. When the first layer coil is wound, copper wires are led in from the lead-out wire port 46, are closely arranged and wound in the same direction along the circumference in the first coil groove 41, are led into the second coil groove 43 after the copper wires are fully wound in the first coil groove 4141, are wound in the opposite circumferential direction to the first coil groove 41, and are used for the subsequent odd layer coil winding until the copper wires are fully wound in order.
Further, as shown in fig. 4, when the even number of coils are wound, copper wires are closely aligned and wound in the same circumferential direction in the second coil groove 43, and after the copper wires are wound in the second coil groove 43, the copper wires are led into the first coil groove 4141, wound in the circumferential direction opposite to the circumferential direction in the second coil groove 43 until the copper wires are wound in order, and then the copper wires are led out from the lead-out port 46.
Further, the first coil 42 is disposed opposite to the first permanent magnet 32, and the second coil 44 is disposed opposite to the second permanent magnet 33.
Further, the rotor component 3 and the stator component 4 are provided with two groups, and the power piston 2 along the axial direction is in a symmetrical structure. The symmetrical free piston configuration is adopted, so that the support of the rotor assembly 3 is more stable and the operation is more stable, and in the embodiment of the application, the rotor assembly 3 is positioned at the center of the plane spring 5, so that the mass center of the rotor assembly 3 is close to the axial center of the plane spring 5, and the operation stability of the rotor assembly is ensured.
More specifically, the working principle of the free piston linear generator for coupling the Stirling heat engine provided by the embodiment of the application is that a power piston 2 is pneumatically coupled with the Stirling heat engine through a compression cavity 11, so that the linear generator is in a free piston type configuration; in the working process, a sine pressure wave in the compression cavity 11 acts on the end face of the power piston 2 to form an axial resultant force F1 pointing to the back pressure cavity 12, working medium pressure in the back pressure cavity 12 acts on the other end of the power piston 2 to form an axial resultant force F2 pointing to the compression cavity 11, when the rotor assembly 3 deviates from the balance position, the plane plate spring 5 generates an axial resultant force F3 pointing to the balance position, and electromagnetic force generated by the rotor assembly 3 points to the axial resultant force F4 of the balance position; under the combined action of the resultant force F1, the resultant force F2, the resultant force F3 and the resultant force F4, the power piston 2 and the mover assembly 3 can take the balance position as a symmetrical center and perform simple harmonic motion along the axial direction; wherein the directions of the resultant forces F3 and F4 are related to the position of the power piston 2, when the power piston 2 is at the right side of the balance position, the directions of the resultant forces F3 and F4 are all horizontal to the left, as shown in fig. 5, when the power piston 2 is at the left side of the balance position, the directions of the resultant forces F3 and F4 are all horizontal to the right; in the moving process, the power piston 2 drives the first permanent magnet 32 and the second permanent magnet 33 in the rotor assembly 3 to move relative to the first coil 42 and the second coil 44 in the stator assembly 4, and the magnetic force lines are cut to generate induced electromotive force on the enamelled copper wire, so that the conversion from mechanical energy to electric energy is realized. According to the application, by adopting the arrangement mode of the double coils and the double permanent magnets, the electromechanical conversion efficiency is high, and the radial resultant force of electromagnetic force generated by electromagnetic induction acting on the rotor assembly is greatly reduced or even zero in the running process of the rotor assembly, so that the reliability and the service life of the gap sealing between the power piston and the cylinder body are improved.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A free piston linear generator for coupling a stirling heat engine comprising a cylinder, a power piston, a mover assembly, a stator assembly and a flat plate spring wherein:
the power piston is arranged in the middle of the cylinder body and divides the inner area of the cylinder body into a compression cavity and a back pressure cavity;
the head part of the power piston is positioned in the compression cavity and seals the compression cavity from the back pressure cavity, and the rod part of the power piston is positioned in the back pressure cavity;
the plane plate springs are arranged in two groups, one group is arranged between the top end of the power piston rod part and the inner wall of the cylinder body, and the other group is arranged between the tail end of the power piston rod part and the inner wall of the cylinder body;
the rotor assembly and the stator assembly are arranged between the two groups of flat plate springs, and the stator assembly is arranged on the outer side of the rotor assembly;
the rotor assembly is arranged in the back pressure cavity and is connected with the rod part of the power piston through the support frame, and the stator assembly is arranged between the inner wall and the outer wall of the cylinder body and is separated from the back pressure cavity.
2. The free-piston linear generator for coupling a stirling heat engine of claim 1 wherein the mover assembly comprises an inner yoke, a first permanent magnet and a second permanent magnet, wherein:
the first permanent magnet and the second permanent magnet are mounted on the outer circle of the inner yoke;
the inner yoke is of a ring structure, and is made of soft magnetic alloy with high saturation magnetic induction intensity;
the first permanent magnet and the second permanent magnet are of circular ring structures, and the materials are soft magnetic materials.
3. The free piston linear generator for coupling a stirling heat engine of claim 2 wherein the first and second permanent magnets are both magnetically charged with annular radiation and are magnetized in opposite directions.
4. A free-piston linear generator for coupling a stirling heat engine in accordance with claim 3 wherein the stator assembly comprises a first coil slot, a first coil, a second coil slot, a second coil, an outer yoke, and an outlet wherein:
the first coil groove and the second coil groove are of annular structures and are arranged between the inner wall and the outer wall of the cylinder body;
the first coil is arranged in the first coil groove, and the second coil is arranged in the second coil groove;
the outer yoke is arranged on the outer sides of the first coil and the second coil, and is made of high-saturation magnetic induction intensity soft magnetic alloy;
the outgoing line port is arranged at the joint of the first coil groove and the cylinder body.
5. The free-piston linear generator for coupling a stirling heat engine of claim 4 wherein the first coil and the second coil are wound from the same round or flat wire of enameled copper.
6. The free-piston linear generator for coupling a stirling heat engine of claim 5 wherein the number of layers of the first and second coils and the number of turns per layer are the same and the number of layers is an even number of equal to or greater than 2.
7. A free piston linear generator for a coupled stirling heat engine in accordance with claim 6 wherein copper wire is introduced from the lead out port during odd layers of winding, closely aligned circumferentially in the first coil slot, and after the copper wire is fully wound in the first coil slot, introduced into the second coil slot, and wound in a circumferential direction opposite the first coil slot until fully wound.
8. The free piston linear generator of claim 6, wherein the even number of layers of coils are wound in a close array around the second coil slot in the same circumferential direction, and after the second coil slot is fully wound, the copper wire is led into the first coil slot, wound in the opposite circumferential direction to the second coil slot until the copper wire is fully wound, and then led out of the outlet.
9. The free-piston linear generator for coupling a stirling heat engine of claim 4 wherein the first coil is disposed opposite the first permanent magnet and the second coil is disposed opposite the second permanent magnet.
10. A free piston linear generator for coupling a stirling heat engine in accordance with claim 1 wherein the mover assembly and the stator assembly are each provided in two sets, the power pistons in the axial direction being of symmetrical configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310635904.0A CN116591854A (en) | 2023-05-31 | 2023-05-31 | Free piston linear generator for coupling Stirling heat engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310635904.0A CN116591854A (en) | 2023-05-31 | 2023-05-31 | Free piston linear generator for coupling Stirling heat engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116591854A true CN116591854A (en) | 2023-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310635904.0A Pending CN116591854A (en) | 2023-05-31 | 2023-05-31 | Free piston linear generator for coupling Stirling heat engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116591854A (en) |
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2023
- 2023-05-31 CN CN202310635904.0A patent/CN116591854A/en active Pending
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