CN107762660B - Heat returning structure and Stirling engine comprising same - Google Patents
Heat returning structure and Stirling engine comprising same Download PDFInfo
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- CN107762660B CN107762660B CN201711203293.3A CN201711203293A CN107762660B CN 107762660 B CN107762660 B CN 107762660B CN 201711203293 A CN201711203293 A CN 201711203293A CN 107762660 B CN107762660 B CN 107762660B
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- 238000010438 heat treatment Methods 0.000 claims abstract description 50
- 238000001816 cooling Methods 0.000 claims description 28
- 239000000498 cooling water Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 9
- 230000001172 regenerating effect Effects 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000000034 method Methods 0.000 description 7
- 210000005239 tubule Anatomy 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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
- F02G1/053—Component parts or details
- F02G1/057—Regenerators
-
- 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
- F02G1/055—Heaters or coolers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a heat recovery structure and a Stirling engine comprising the heat recovery structure, wherein the heat recovery structure comprises: the air distribution cylinder is characterized in that one end of the air distribution cylinder is provided with a plurality of parallel heating pipes, the heating pipes are perpendicular to the end face of the air distribution cylinder, one end of each heating pipe is sealed, the other end of each heating pipe is communicated with the air distribution cylinder, and an air distribution piston capable of reciprocating is arranged in the air distribution cylinder; the heat regenerator is fixedly connected to the end face, facing the heating pipe, of the air distribution piston, a plurality of cylinders matched with the inner cavity of the heating pipe are arranged at one end of the heat regenerator, and the cylinders are inserted into the heating pipe when the heat regenerator moves along with the air distribution piston to the end, connected with the heating pipe, of the air distribution cylinder. The movable heat regenerator disclosed by the invention not only simplifies the complex structure of the original Stirling engine, reduces the manufacturing cost, but also reasonably eliminates the dead space gas in the heat regenerator, thereby achieving the purpose of high-efficiency heat exchange output and work application.
Description
Technical Field
The present invention relates to the field of engines. More particularly, the present invention relates to a regenerative structure and a stirling engine incorporating the same.
Background
The Stirling engine is an externally heated engine invented by Mr. Stirling in the United kingdom in 1816, and converts heat energy into mechanical energy through the action of isobaric expansion to do work externally. The working principle is as follows: the gas in the cylinder is expanded by external heat supply (or combustion), the expanded gas can push the piston to move, and the expanded gas is contracted after cooling and is matched with the reverse movement of the piston. The repeated expansion and cooling of the gas makes the piston reciprocate under the cooperation of the flywheel to do work.
In order to increase efficiency, it is necessary to rapidly heat and cool the gas inside the cylinder. In order to achieve the purpose, the modern Stirling engine has a structure which is different from that of a traditional engine, a heating unit at the top end of a cylinder is composed of a plurality of thin tubes, when a gas distribution piston moves towards the top end of the cylinder, gas can be pushed into the thin tubes, because of a large enough area, the gas can be rapidly heated, meanwhile, hot gas in the thin tubes can be pushed into a cavity called a regenerator, the cavity is filled with a wire mesh component, the hot gas heats the wire mesh, the hot gas is cooled by the hot gas, the original gas in the regenerator is pushed into a cooler, all the gas is in a cold state at the moment, the power piston moves towards the top end of the cylinder under the drive of a flywheel, and the gas is compressed. Then the gas distribution piston firstly moves reversely, the gas in the cooler enters the heat regenerator, the heat regenerator is heated in the previous step, at this time, the heat on the high-temperature wire mesh assembly can be transferred to the cool air from the cooler to enable the cool air to be heated and expanded, meanwhile, the gas in the heat regenerator which is originally cooled by the wire mesh is returned to the tubule of the heater to be heated by the tubule to generate expansion, and the expanded gas pushes the power piston to move reversely to output power to drive the flywheel to rotate. The rotating flywheel drives the air distribution piston to move forward, so that the air enters the cooling process again.
It can be seen that the regenerator is very important in function, and is a porous material, which can exchange heat with the gas flowing through the regenerator rapidly, so that the high efficiency of heat exchange is ensured. However, this brings about the problem that the overall system is very complex: firstly, one end of a plurality of tubules is welded to the top of the cylinder, and the other end of the tubules is welded to the inlet of the regenerator, so that the formed tubules are uniformly distributed to be beneficial to heat absorption in order to ensure the heating efficiency of an external heat source. The result of this is that the heater and regenerator sections are expensive to manufacture, affecting the overall manufacturing cost of the engine. Part of dead space gas is always arranged in the heat regenerator (a space without porous metal materials is arranged between the heat regenerator and the heater, and the gas in the space cannot be cooled by the heat regenerator and cannot do work).
Disclosure of Invention
It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.
It is still another object of the present invention to provide a regenerator structure and a stirling engine incorporating the same that employs a movable regenerator that simplifies the complex structure of the original stirling engine, reduces manufacturing costs, and reasonably eliminates dead space gas within the regenerator.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a regenerative structure including:
The heating pipe is arranged at the heating end of the air distribution cylinder and is communicated with the air distribution cylinder;
the heat regenerator is fixedly connected to the end face, facing the heating pipe, of the air distribution piston, a cylinder matched with the inner cavity of the heating pipe is arranged on the heat regenerator, and when the air distribution piston moves to one end, connected with the heating pipe, of the air distribution cylinder, the cylinder is inserted into the heating pipe.
Preferably, the cylinder body of the gas distribution cylinder includes:
The cylinder liner is cylindrical, the inner diameter of the cylinder liner is the same as the diameter of the distribution piston, and a cooling water pipe is arranged in the middle part of the outer wall of the cylinder liner in a surrounding manner;
The cylinder shell is also cylindrical, annular sealing pieces are coaxially arranged at two ends of the cylinder shell, the inner diameter of each annular sealing piece is identical to the outer diameter of the cylinder liner, and the cylinder shell is sleeved outside the cylinder liner to form a closed cooling cavity with the cylinder liner, wherein the closed cooling cavity comprises a cooling water pipe;
The air cylinder inner container is further provided with an annular gap, the annular gap is arranged on one side, close to the heating pipe, of the cooling water pipe, and the whole stroke of the heat regenerator moving along with the air distribution piston is kept in contact with the annular gap, so that working medium gas flows between the heat regenerator and the cooling cavity.
Preferably, the cylinder is made of a rigid wire sintered mesh and the cylinder surface is covered with a hard outer shell.
Preferably, the plurality of heating pipes are distributed in a multi-layer annular array around the axis of the air distribution cylinder.
The present invention also provides a Stirling engine comprising:
The heat return structure;
The power cylinder is internally provided with a power piston capable of reciprocating, and the inner cavity of the power cylinder is communicated with the closed cooling cavity so that working medium gas flows among the inner cavity of the power cylinder, the cooling cavity and the heat regenerator;
The rotation track of the flywheel is in the same plane with the motion track of the power piston and the motion track of the gas distribution piston, and the gas distribution piston and the power piston are connected with the flywheel through connecting rods so as to convert the self linear motion into the rotation of the flywheel.
Preferably, the motion track of the air distribution piston is perpendicular to the motion track of the power piston, the circle center of the flywheel is located at the intersection point of the motion track of the air distribution piston and the motion track of the power piston, a first connecting rod is hinged to the air distribution piston, the other end of the first connecting rod is hinged to the edge of the flywheel, a second connecting rod is hinged to the power piston, and the hinge point of the second connecting rod and the flywheel is the same as the hinge point of the first connecting rod and the flywheel.
Preferably, when the gas distribution piston starts to move from one end of the gas distribution cylinder, which is close to the heating pipe, to the other end of the gas distribution cylinder, the power piston moves in the direction of compressing working medium gas.
Preferably, the cylinder shell is provided with a water inlet hole and a water outlet hole, the water inlet pipe of the cooling water pipe is communicated with the water inlet hole, and the water outlet pipe of the cooling water pipe is communicated with the water outlet hole.
Preferably, the connection part of the heat regenerator and the air distribution piston is cylindrical, and the diameter of the heat regenerator is the same as the inner diameter of the cylinder liner.
The invention also provides a swash plate type four-cylinder Stirling engine comprising the regenerative structure.
The invention at least comprises the following beneficial effects:
1. simple structure, convenient manufacture, low processing cost and extremely high economical practicability.
2. The regenerator is designed to be movable so as to substantially reduce the dead volume in the Stirling engine.
3. The top end of the cylinder body is designed into a plurality of groups of tubule heating ends, so that the heat exchange area can be fully increased, and the efficiency is improved.
4. The cooling cavity is designed into a tube type structure around the cylinder body, and the method can improve the efficiency of cooling and heat exchange and ensure that the whole structure is compact.
5. The movable heat regenerator can be applied to Stirling engines in various structural forms, such as the existing swash plate type four-cylinder Stirling engine, a typical single-cylinder engine and the like.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic side view of the present invention;
FIG. 2 is a schematic view of a heating tube according to the present invention;
FIG. 3 is a schematic view of a regenerator according to the present invention;
fig. 4 is a schematic structural view of a cylinder liner of the air distribution cylinder according to the present invention.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that, in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1-3, the present invention provides a regenerative structure comprising:
One end of the air distribution cylinder 1 is provided with a plurality of parallel heating pipes 2, the heating pipes 2 are perpendicular to the end face of the air distribution cylinder 1, one end of each heating pipe 2 is sealed, the other end of each heating pipe is communicated with the air distribution cylinder 1, and an air distribution piston 3 capable of reciprocating is further arranged in the air distribution cylinder 1;
The heat regenerator 4 is fixedly connected to the end face of the air distribution piston 3, which faces the heating pipe 2, a plurality of cylinders matched with the inner cavity of the heating pipe 2 are arranged at one end of the heat regenerator 4, and when the heat regenerator 4 moves to one end, connected with the heating pipe 2, of the air distribution cylinder 1 along with the air distribution piston 3, the cylinders are inserted into the heating pipe 2.
In the use process of the embodiment, the heating pipes 2 are used for heating the heating pipes 2 to replace the original Stirling engine to directly heat the cylinder body of the air distribution cylinder 1, so that the area of a heated part can be fully increased, working medium gas in the heating pipes 2 is rapidly heated, the time required for preheating is reduced, and the air distribution cylinder is simple in structure and convenient to manufacture.
In another embodiment, as shown in fig. 1 and 4, the block of the distribution cylinder 1 includes:
the cylinder liner 5 is cylindrical, the inner diameter of the cylinder liner is the same as the diameter of the air distribution piston 3, and a cooling water pipe 6 is arranged in a ring at the middle part of the outer wall of the cylinder liner 5;
The cylinder shell 7 is also cylindrical, annular sealing pieces 8 are coaxially arranged at two ends of the cylinder shell, the inner diameter of each annular sealing piece 8 is the same as the outer diameter of the cylinder liner 5, and the cylinder shell 7 is sleeved outside the cylinder liner 5 to form a closed cooling cavity with the cylinder liner 5, wherein the closed cooling cavity comprises a cooling water pipe 6;
The cylinder liner 5 is further provided with an annular gap 9, the annular gap 9 is arranged on one side, close to the heating pipe 2, of the cooling water pipe 6, and the whole travel of the heat regenerator 4 along with the movement of the distribution piston 3 is kept in contact with the annular gap 9, so that working medium gas flows between the heat regenerator 4 and the cooling cavity.
In the use process of the embodiment, the cooling cavity is directly arranged outside the cylinder body of the distribution cylinder 1, the structure is simple and compact, the cooling cavity is suitable for Stirling engines which are required to be used in a narrow space, meanwhile, the cooling cavity is communicated with the regenerator 4 through the annular gap 9, no redundant pipelines exist, firstly, the flow path of working medium gas is shortened, thus the flow time of the working medium gas is shortened, secondly, the heat loss caused by the flow of the working medium gas in the redundant pipelines is avoided, the heat efficiency of the Stirling engines is further improved, and the cooling structure is simple and convenient to manufacture.
In another embodiment, the cylinder is made of a rigid wire sintering net, the design is stronger than the traditional design, the heat exchange efficiency is higher, the surface of the cylinder is coated with a hard shell, and the ideal material of the hard shell is hard alloy with higher melting point.
In another embodiment, the heating pipes 2 have the same shape and size, the plurality of heating pipes 2 are distributed in a multi-layer annular array around the axis of the air distribution cylinder 1, so that each part in each heating pipe 2 is heated uniformly, the temperature rising speeds of working medium gas in each heating pipe 2 are not greatly different, when the working medium gas expands to apply work to the air distribution piston 3, the end face of the air distribution piston 3 is stressed uniformly, no bending moment is generated, and the friction resistance of the inner wall of the cylinder to the air distribution piston 3 is reduced.
The present invention also provides a Stirling engine comprising:
The heat return structure;
The power cylinder 10 is internally provided with a power piston 11 capable of reciprocating, and the inner cavity of the power cylinder 10 is communicated with the closed cooling cavity so that working medium gas flows between the inner cavity of the power cylinder 10 and the cooling cavity as well as the heat regenerator 4;
The rotation track of the flywheel 12 is in the same plane with the motion track of the power piston 11 and the gas distribution piston 3, and the gas distribution piston 3 and the power piston 11 are connected with the flywheel 12 through connecting rods so as to convert the self linear motion into the rotation of the flywheel 12.
In the use process of the embodiment, the double-cylinder structure of the power cylinder 10 and the air distribution cylinder 1 is adopted, compared with a Stirling engine with a single-cylinder structure, the strokes of the power piston 11 and the air distribution piston 3 can be shortened, and the length of a connecting rod and the volume of the flywheel 12 are further reduced, so that the volume of the Stirling engine can be smaller, the power cannot be influenced, and meanwhile, the Stirling engine can be driven to continuously run by using the inertia of the flywheel 12.
In another embodiment, the motion track of the air distribution piston 3 is perpendicular to the motion track of the power piston 11, the center of the flywheel 12 is located at the intersection point of the motion track of the air distribution piston 3 and the motion track of the power piston 11, a first connecting rod 13 is hinged on the air distribution piston 3, the other end of the first connecting rod 13 is hinged at the edge of the flywheel 12, a second connecting rod 14 is hinged on the power piston 11, the hinge point of the second connecting rod 14 and the flywheel 12 is the same as the hinge point of the first connecting rod 13 and the flywheel 12, so that the motion process of the air distribution piston 3 and the motion process of the power piston 11 always differ by oneAnd then the four steps of constant volume heating, isothermal expansion, constant volume cooling and isothermal compression of working medium gas in the Stirling engine can better accord with thermodynamic cycle curves, thereby obtaining high-efficiency heat exchange acting efficiency.
In another embodiment, when the gas distribution piston 3 starts to move from one end of the gas distribution cylinder 1, which is close to the heating pipe 2, to the other end of the gas distribution cylinder 1, the power piston 11 moves in the direction of compressing the working medium gas, so that the stirling engine operates in the forward direction, and heat energy is continuously converted into mechanical work.
In another embodiment, the cylinder housing 7 is provided with a water inlet hole and a water outlet hole, the water inlet pipe of the cooling water pipe 6 is communicated with the water inlet hole, the water outlet pipe of the cooling water pipe 6 is communicated with the water outlet hole, and the circulating water is used for cooling the working medium gas, so that the heat of the working medium gas can be quickly absorbed, and the purpose of quick cooling is achieved.
In another embodiment, the portion, connected to the valve piston 3, of the regenerator 4 is cylindrical, and the diameter of the portion, connected to the valve piston 3, of the regenerator 4 is the same as the inner diameter of the cylinder liner 5, so that when the regenerator 4 moves along with the valve piston 3 to one end, connected to the heating pipe 2, of the valve cylinder 1, the regenerator 4 completely fills a space between the end face of the valve piston 3 and the end face of the valve cylinder 1, and working medium gas can directly enter the regenerator 4 from a cooling cavity to heat, so that the working efficiency is higher.
In another embodiment, the annular sealing member 8 comprises an annular baffle plate and a sleeve coaxially connected with the annular baffle plate, the annular baffle plate is coaxially connected with the end face of the cylinder shell 7, the outer diameter of the annular baffle plate is the same as the outer diameter of the cylinder shell 7, the inner diameter of the sleeve is the same as the outer diameter of the cylinder liner 5, and thus the contact area between the annular sealing member 8 and the cylinder liner 5 is larger, and the sealing effect is better than that of only one annular baffle plate.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (7)
1. A regenerative structure, comprising:
The heating pipe is arranged at the heating end of the air distribution cylinder and is communicated with the air distribution cylinder;
the heat regenerator is fixedly connected to the end face, facing the heating pipe, of the air distribution piston, a cylinder matched with the inner cavity of the heating pipe is arranged on the heat regenerator, and when the air distribution piston moves to one end, connected with the heating pipe, of the air distribution cylinder, the cylinder is inserted into the heating pipe;
The cylinder body of the distribution cylinder comprises:
The cylinder liner is cylindrical, the inner diameter of the cylinder liner is the same as the diameter of the distribution piston, and a cooling water pipe is arranged in the middle part of the outer wall of the cylinder liner in a surrounding manner;
The cylinder shell is also cylindrical, annular sealing pieces are coaxially arranged at two ends of the cylinder shell, the inner diameter of each annular sealing piece is identical to the outer diameter of the cylinder liner, and the cylinder shell is sleeved outside the cylinder liner to form a closed cooling cavity with the cylinder liner, wherein the closed cooling cavity comprises a cooling water pipe;
The air cylinder liner is also provided with an annular gap, the annular gap is arranged on one side of the cooling water pipe, which is close to the heating pipe, and the whole travel of the heat regenerator along with the movement of the air distribution piston is kept in contact with the annular gap, so that working medium gas flows between the heat regenerator and the cooling cavity;
The cylinder is made of a rigid metal wire sintering net, and the surface of the cylinder is coated with a hard shell;
The heating pipes are distributed in a multi-layer annular array around the axis of the air distribution cylinder.
2.A stirling engine comprising:
The regenerative structure of claim 1;
The power cylinder is internally provided with a power piston capable of reciprocating, and the inner cavity of the power cylinder is communicated with the closed cooling cavity so that working medium gas flows among the inner cavity of the power cylinder, the cooling cavity and the heat regenerator;
The rotation track of the flywheel is in the same plane with the motion track of the power piston and the motion track of the gas distribution piston, and the gas distribution piston and the power piston are connected with the flywheel through connecting rods so as to convert the self linear motion into the rotation of the flywheel.
3. The stirling engine of claim 2, wherein the motion of the displacer is perpendicular to the motion of the power piston, the center of the flywheel is at the intersection of the motion of the displacer and the motion of the power piston, a first link is hinged to the displacer, the other end of the first link is hinged to the flywheel edge, a second link is hinged to the power piston, and the hinge points of the second link and the flywheel are the same as the hinge points of the first link and the flywheel.
4. A stirling engine in accordance with claim 3 wherein the power piston moves in a direction to compress the working fluid gas as the displacer moves from one end of the displacer adjacent the heating tube to the other end of the displacer.
5. The stirling engine of claim 2, wherein said cylinder housing is provided with an inlet opening and an outlet opening, wherein an inlet pipe of said cooling water pipe is in communication with said inlet opening, and wherein an outlet pipe of said cooling water pipe is in communication with said outlet opening.
6. The stirling engine of claim 2, wherein the portion of the regenerator to which the displacer is connected is cylindrical and has the same diameter as the cylinder liner inner diameter.
7. A swash plate type four-cylinder stirling engine incorporating the regenerative structure of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711203293.3A CN107762660B (en) | 2017-11-27 | 2017-11-27 | Heat returning structure and Stirling engine comprising same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711203293.3A CN107762660B (en) | 2017-11-27 | 2017-11-27 | Heat returning structure and Stirling engine comprising same |
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| Publication Number | Publication Date |
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| CN107762660A CN107762660A (en) | 2018-03-06 |
| CN107762660B true CN107762660B (en) | 2024-05-14 |
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| CN108518434A (en) * | 2018-03-30 | 2018-09-11 | 重庆绿陶摩擦材料有限公司 | Canescence environmentally friendly vehicle friction plate |
| CN109915279A (en) * | 2019-04-13 | 2019-06-21 | 天津启星动力科技有限公司 | Star-like semi-free piston revolving cylinder engine magnetic linkage combining form |
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