CN115539239A - Split free piston Stirling engine with opposite common cavities - Google Patents

Split free piston Stirling engine with opposite common cavities Download PDF

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Publication number
CN115539239A
CN115539239A CN202110725938.XA CN202110725938A CN115539239A CN 115539239 A CN115539239 A CN 115539239A CN 202110725938 A CN202110725938 A CN 202110725938A CN 115539239 A CN115539239 A CN 115539239A
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China
Prior art keywords
piston
cavity
power
cold
pistons
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CN202110725938.XA
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Chinese (zh)
Inventor
焦珂欣
洪国同
牟健
林明嫱
池春云
向方园
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Technical Institute of Physics and Chemistry of CAS
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Technical Institute of Physics and Chemistry of CAS
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Priority to CN202110725938.XA priority Critical patent/CN115539239A/en
Publication of CN115539239A publication Critical patent/CN115539239A/en
Pending legal-status Critical Current

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/044—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines having at least two working members, e.g. pistons, delivering power output
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1869—Linear generators; sectional generators
    • H02K7/1876—Linear generators; sectional generators with reciprocating, linearly oscillating or vibrating parts
    • H02K7/1884—Linear generators; sectional generators with reciprocating, linearly oscillating or vibrating parts structurally associated with free piston engines

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

Abstract

The invention provides a split free piston Stirling engine with a common cavity arranged oppositely, which comprises at least one group of hot cylinders and at least one group of cold cylinders, wherein a plurality of gas distribution pistons arranged oppositely in pairs are arranged in the at least one group of hot cylinders; the cold air cylinder group is internally provided with a plurality of power pistons which are arranged oppositely in pairs; a single distribution piston or a plurality of groups of distribution pistons are surrounded by a hot cavity, and one side of the distribution piston, which is far away from the hot cavity, is provided with a first back pressure cavity; a first cold cavity is formed by enclosing a single power piston or multiple groups of power pistons, and a second back pressure cavity communicated with the first back pressure cavity is formed in one side, far away from the first cold cavity, of each power piston. Through the mode, the vibration intensity of the running of the engine is reduced, the running frequency of the engine can be improved, and the engine can realize higher output under a more compact structure.

Description

Split free piston Stirling engine with opposite common cavities
Technical Field
The invention relates to the technical field of engines, in particular to a split free piston Stirling engine with opposite common cavities.
Background
With the continuous increase of population and the improvement of living standard of people, the demand of energy is increasing day by day, and fossil energy is gradually exhausted; meanwhile, the use of fossil energy also causes problems of global warming and climate change. The above contradiction has prompted the search for new alternative energy sources, which requires more efficient energy utilization. The Stirling engine as an external combustion engine can convert any form of heat source into mechanical energy, and in addition, the Stirling engine works based on the closed cycle principle, so that the Stirling engine has the advantages of low noise, no influence of air pressure and the like, and the theoretical efficiency of the Stirling cycle is equal to the Carnot efficiency.
Stirling engines can be classified into two types, kinematic and kinetic, depending on the presence or absence of a transmission. The free piston Stirling engine is taken as a most main structure type in a dynamic Stirling engine, a moving part used for connecting two pistons in the traditional kinematic Stirling engine is omitted, the two pistons move independently, the pistons are coupled dynamically by gas pressure, and the free piston Stirling engine has the advantages of being free of maintenance, self-starting, long in service life and the like, so that the free piston Stirling engine has wide application prospects in aspects of deep space detector isotope power supplies, space large-scale nuclear power plants, ground solar power generation, industrial waste heat recovery, household combined heat and power generation and the like.
The free piston Stirling engine is a vibration system and mainly comprises a power piston vibration system, a gas distribution piston vibration system and a whole engine vibration system, wherein the vibration of the power piston vibration system and the gas distribution piston vibration system can cause the vibration of the whole engine. Vibration of the engine system not only affects the performance and useful life of the overall engine, but also reduces the reliability of engine operation. The simple vibration reduction measure is that two independent free piston Stirling generators are oppositely arranged, the arrangement theoretically can achieve the purpose of reducing vibration, but the premise is that thermodynamic parameters of the two generators are required to be completely consistent, complex mutual coupling and influence can be generated after the thermodynamic parameters are inconsistent, and the vibration reduction effect is reduced.
Disclosure of Invention
The embodiment of the invention provides a split type free piston Stirling engine with opposite common cavities, which is used for solving the technical problem that the generator in the prior art is greatly influenced by vibration.
The embodiment of the invention provides a split type free piston Stirling engine with opposite common cavities, which comprises: the at least one group of hot cylinders are internally provided with a plurality of gas distribution pistons which are arranged in pairs;
the cold air cylinder group is internally provided with a plurality of power pistons which are arranged in pairs;
a plurality of groups of air distribution pistons are enclosed to form a hot cavity, and a first back pressure cavity is arranged on one side of each air distribution piston, which is far away from the hot cavity; the multiple groups of power pistons are enclosed to form a first cold cavity, and one side, far away from the first cold cavity, of each power piston is a second back pressure cavity communicated with the first back pressure cavity.
According to the split free piston Stirling engine with the same cavity body and opposite, one end, far away from the other valve piston arranged opposite, of the valve piston is provided with a partition plate and a valve piston plate spring;
the partition board is connected with the hot cylinder, the distribution piston is provided with a distribution piston rod, and the distribution piston plate spring is connected with the distribution piston rod and the hot cylinder.
According to the co-cavity opposed split free-piston Stirling engine disclosed by the embodiment of the invention, one end of one power piston, which is far away from the other power piston which is oppositely arranged, is provided with a power piston plate spring;
and a power piston rod is arranged on the power piston, and the power piston plate spring is connected with the power piston rod and the cold air cylinder.
According to the split free piston Stirling engine with the same cavity body and opposite, a second cold cavity is arranged between the gas distribution piston and the partition plate;
and a connecting pipe is arranged between the hot air cylinder and the cold air cylinder, one end of the connecting pipe is communicated with the second cold cavity, and the other end of the connecting pipe is communicated with the first cold cavity.
According to the split free piston Stirling engine with the same cavity body opposite, a heater is further arranged on the outer side of the hot cylinder, one end of the heater is communicated with the hot cavity, the other end of the heater is connected with a heat regenerator and a cooler, one end of the cooler is connected with the heat regenerator, and the other end of the cooler is communicated with the second cold cavity.
According to the split free piston Stirling engine with the same cavity and the opposite cavities, pressure stabilizing pipelines are arranged outside the hot air cylinder and the cold air cylinder and are respectively connected with the first back pressure cavity and the second back pressure cavity, so that all the first back pressure cavity and the second back pressure cavity are in a communicated state.
According to the split free piston Stirling engine with the same cavity body opposite, the cold air cylinder is externally provided with the linear motor, and the linear motor is driven to generate electricity through the reciprocating movement of the power piston.
According to the split free piston stirling engine with the same cavity body opposite, the gas distribution piston and the power piston respectively reciprocate in the hot cylinder and the cold cylinder with preset phase difference.
According to the split free piston stirling engine with the same cavity body arranged oppositely, the preset ideal value of the phase difference is 90 degrees.
According to the split free piston Stirling engine with the common cavities arranged oppositely, the first backpressure cavity on the side, away from the hot cavity, of the gas distribution piston and the second backpressure cavity on the side, away from the first cold cavity, of the power piston are communicated with each other, so that the gas force applied to each power piston or each gas distribution piston in the motion process is the same, the vibration effects generated by each gas distribution piston and each power piston in the motion process are mutually offset, the vibration in the operation process of the engine is reduced, the gas distribution pistons and the power pistons arranged oppositely in pairs act simultaneously, when the total output power is the same, the displacement of the power piston and the gas distribution pistons is obviously reduced compared with that of the engine with a single piston, the vibration force generated by the power piston and the gas distribution pistons is also greatly reduced, and the structural size of the engine is reduced due to the reduction of the motion strokes of the power piston and the gas distribution pistons, so that the service life and the reliability of elastic parts of the power piston and the gas distribution pistons can be improved, the operation frequency of the engine can be improved, and the higher output of the engine can be realized under a more compact structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the construction of one embodiment of the co-cavity opposed split free piston Stirling engine of the present invention;
FIG. 2 is a schematic structural view of another embodiment of the co-cavity opposed split free piston Stirling engine of the present invention;
FIG. 3 is a schematic structural view of a third embodiment of the co-cavity opposed split free-piston Stirling engine of the present invention;
FIG. 4 is a schematic structural view of a fourth embodiment of the co-cavity opposed split free piston Stirling engine of the present invention;
FIG. 5 is a schematic structural view of a fifth embodiment of the co-cavity opposed split free piston Stirling engine of the present invention;
reference numerals are as follows:
10. a hot cylinder; 110. a gas distribution piston; 1110. a thermal chamber; 1120. a first back pressure chamber; 1130. a gas distribution piston rod; 120. a partition plate; 130. a distribution piston leaf spring; 140. a second cold chamber; 150. a heater; 160. a heat regenerator; 170. a cooler;
20. an air cooling cylinder; 210. a power piston; 2110. a first cold chamber; 2120. a second back pressure chamber; 2130. a power piston rod; 220. a power piston plate spring; 230. a linear motor;
30. a connecting pipe;
40. a pressure stabilizing pipeline.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention provides a common-cavity-opposed split-type free piston stirling engine, which is combined with fig. 1 to fig. 5, and comprises at least one group of hot cylinders 10 and at least one group of cold cylinders 20, wherein a plurality of gas distribution pistons 110 which are arranged in pairs in the at least one group of hot cylinders 10, a plurality of power pistons 210 which are arranged in pairs in the at least one group of cold cylinders 20, a hot cavity 1110 is enclosed by a single gas distribution piston 110 or a plurality of groups of gas distribution pistons 110, and a first back pressure cavity 1120 is arranged on one side of the gas distribution piston 110 away from the hot cavity 1110; a single power piston 210 or multiple sets of power pistons 210 enclose a first cold chamber 2110, and the side of the power piston 210 remote from the first cold chamber 2110 is a second back-pressure chamber 2120 in communication with the first back-pressure chamber 1120.
Specifically, the number of the displacer 110 and the power piston 210 is not limited herein, and may be, for example, two opposed displacer 110 and two opposed power pistons 210, four opposed displacer 110 corresponding to four opposed power pistons 210, four opposed displacer 110 corresponding to two opposed power pistons 210, or four opposed power pistons 210 corresponding to four opposed displacer 110.
In one embodiment of the present invention, for the displacer 110, one end of one of the displacer 110 remote from the other displacer 110 is provided with a spacer 120 and a displacer plate spring 130. The partition 120 is connected to the hot cylinder 10, the air distribution piston 110 is provided with an air distribution piston rod 1130, and the air distribution piston 110 is connected to the air distribution piston rod 1130 and the hot cylinder 10. The displacer rod 1130 drives the displacer leaf spring 130 to deform as the displacer 110 reciprocates in the hot cylinder 10. It should be noted that the "plate spring" in the above embodiments may be a combination of other types of springs (e.g., column spring, magnetic spring) and other supports (e.g., gas bearing, magnetic bearing), and is not limited herein.
For the power pistons 210, one end of one of the power pistons 210, which is far away from the other power piston 210, is provided with a power piston plate spring 220, the power piston 210 is provided with a power piston rod 2130, and the power piston plate spring 220 is connected with the power piston rod 2130 and the cold air cylinder 20. That is, when the power piston 210 reciprocates in the air conditioning cylinder 20, the power piston rod 2130 drives the power piston plate spring 220 to deform.
A second cold chamber 140 is arranged between the air distribution piston 110 and the partition 120, a connecting pipe 30 is arranged between the hot cylinder 10 and the cold cylinder 20, one end of the connecting pipe 30 is communicated with the second cold chamber 140, and the other end of the connecting pipe 30 is communicated with the first cold chamber 2110, that is, the first cold chamber 2110 and the second cold chamber 140 are in a communication state. Whereby gas in the second cold chamber 140 can move toward the first cold chamber 2110 as the opposing displacer 110 compresses the hot chamber 1110.
The outside of the hot cylinder 10 is further provided with a heater 150, one end of the heater 150 is communicated with the hot chamber 1110, the other end of the heater 150 is connected with a regenerator 160 and a cooler 170, one end of the cooler 170 is connected with the regenerator 160, and the other end is communicated with the second cold chamber 140. The heater 150 is used to deliver heat to the thermal chamber 1110 to create gas pressure to move the displacer 110 and the power piston 210. The regenerator 160 is used for isochoric heat absorption and isochoric heat release.
The outside of the hot cylinder 10 and the cold cylinder 20 is provided with a pressure stabilizing pipeline 40, and the pressure stabilizing pipeline 40 is respectively connected with the first back pressure cavity 1120 and the second back pressure cavity 2120. The provision of the pressure stabilizing duct 40 serves to equalize the gas forces experienced by each of the opposed power pistons 210 or the displacer 110 during movement, helping to ensure consistency in the state of movement of each of the power pistons 210 or the displacer 110. The pressure stabilizing conduit 40 serves to connect all of the first back-pressure chambers 1120 or the second back-pressure chambers 2120 together, or to connect all of the first back-pressure chambers 1120 and the second back-pressure chambers 2120 together at the same time, so that the gas forces to which each of the opposing power pistons 210 or displacer pistons 110 are subjected during their movements are the same.
Further, a linear motor 230 is disposed outside the air conditioner 20. During the reciprocating motion of the power piston 210, the linear motor 230 and the power piston 210 move relatively, thereby generating a change of magnetic flux and outputting electric energy.
The displacer 110 and the power piston 210 reciprocate within the hot cylinder 10 and the cold cylinder 20, respectively, with a predetermined phase difference.
Referring to fig. 1, in an embodiment of the present invention, the working principle of two air distribution pistons 110 corresponding to two power pistons 210 is described as follows:
it should be noted that the two displacer pistons 110 and the two power pistons 210 are coupled by gas force, and the two displacer pistons 110 and the two power pistons 210 are respectively located in the hot cylinder 10 and the cold cylinder 20. The furthest of the relative distance of the two displacer pistons 110 corresponds to the far dead center of the two displacer pistons 110 and the closest of the relative distance of the two displacer pistons 110 corresponds to the near dead center of the two displacer pistons 110. Similarly, the relative distance between the two power pistons 210 corresponds to the farthest dead point of the two power pistons 210, and the relative distance between the two power pistons 210 corresponds to the nearest dead point of the two power pistons 210.
In the initial state, the two displacer pistons 110 are located near the far dead center and the two power pistons 210 are located near the near dead center. The thermal chamber 1110 receives the external heat from the heater 150, and the high-pressure gas expands due to heat, pushing the power piston 210 to move toward the far dead center until it approaches the far dead center. When the power piston 210 moves towards the far dead center, the air pressure in the working chamber decreases, the pressure difference between the working chamber and the back pressure chamber decreases, the gas force applied to the gas distribution piston 110 decreases, and the elastic force of the gas distribution piston plate spring 130 pushes the gas distribution piston 110 to move towards the near dead center. During the process that the two gas distribution pistons 110 move towards the near dead center, the gas in the hot chamber 1110 is pushed to be sequentially conveyed to the first cold chamber 2110 through the regenerator 160, the cooler 170 and the second cold chamber 140, the hot gas completes the equal-volume heat release in the regenerator 160, and the heat is transferred to the metal filler in the regenerator 160. The two distribution pistons 110 move to the near dead center and start to move to the far dead center in a reversing way, meanwhile, the two power pistons 210 move to the near dead center, the gas is compressed in the first cold cavity 2110, and the compression heat is dissipated outwards through the cooler 170, so that the isothermal compression process is realized. Finally, when the power pistons 210 reach the near dead center and start to move towards the far dead center, the two distribution pistons 110 continue to move from the near dead center to the far dead center, the working medium gas is pushed to enter the hot chamber 1110 from the first cold chamber 2110 through the heat regenerators 160 on the two sides respectively, the gas completes the constant volume heat absorption process in the heat regenerator 160, the temperature rises after the metal filler in the heat regenerator 160 absorbs heat, and then the two power pistons 210 can continue to move towards the far dead center to perform the isothermal expansion process, so that the gas in the engine can start the cycle of the next round, and the process is repeated. During the cycle, the motion of the two displacer pistons 110 always leads the two power pistons 210 by approximately 90 degrees.
That is, in the process of engine operation, the moving parts move approximately in a sine shape when in operation, and the back pressure chambers of the engine are communicated with each other, so that in the process of engine operation, the gas force applied to each pair of power pistons 210 or gas distribution pistons 110 is the same, the motion states are also completely the same, the power pistons 210 and the gas distribution pistons 110 are arranged in pairs in opposite, so that the output result after the two sine waves with the same amplitude and opposite phases are mutually superposed is 0, the vibration generated by the motion of each pair of power pistons 210 or gas distribution pistons 110 is mutually offset, the vibration force of the whole engine system is 0, and the low-vibration and high-reliability operation of the whole system is realized.
Referring to FIG. 2, in another embodiment of the present invention, the first cold chamber 2110 may not be shared by two oppositely disposed power pistons 210. For example, in a state where the first cold chamber 2110 is not shared between the two power pistons 210, the connection pipe 30 is provided between the second cold chamber 140 and the first cold chamber 2110 for connection. Alternatively, referring to fig. 3, it is possible to have no common thermal cavity between two displacer pistons 110.
Referring to fig. 4 and 5, in other embodiments of the present invention, four displacer pistons 110 and two power pistons 210 may be provided. For example, four displacer 110 are disposed opposite to each other, and each displacer 110 is externally provided with a heater 150, a regenerator 160, and a cooler 170. Alternatively, in other embodiments, four displacer pistons 110 and two power pistons 210 or four power pistons 210 may be provided. The four power pistons 210 are arranged opposite to each other in pairs. For a specific operation principle, reference may be made to the above description, which is not repeated herein.
In summary, the split free-piston stirling engine with the opposite common cavities provided by the present invention makes the two displacer pistons 110 share one hot cavity 1110 through the gas coupling effect, and makes the two power pistons 210 share one first cold cavity 2110, so that the number of the hot cavities 1110 and the first cold cavities 2110 in the engine is reduced, the structure is more compact, and at the same time, the heat loss during the engine operation process is reduced, and the thermal efficiency of the engine is improved, and the power pistons 210 and the displacer pistons 110 of the engine are separately arranged in two cylinders, that is, the hot cylinder 10 and the cold cylinder 20, so that the interference between two vibration systems is reduced. And two gas distribution pistons 110 and two power pistons 210 are symmetrically arranged in pairs, and in the running process of the engine, the vibration directions of each pair of power pistons 210 and gas distribution pistons 110 are opposite, and the vibration is mutually counteracted, so that the vibration of the whole engine system is effectively reduced, and the back pressure cavities in the engine are mutually communicated, so that the consistency of the gas force and the motion state borne by each pair of power pistons 210 and gas distribution pistons 110 is more effectively ensured. Meanwhile, as the two pairs of gas distribution pistons 110 and the power piston 210 act simultaneously in the engine, when the total output power is the same, the displacement of the gas distribution pistons 110 and the power piston 210 is obviously reduced compared with that of the traditional free piston stirling engine, so that the vibration force of the power piston 210 and the gas distribution pistons 110 is also obviously reduced, in addition, as the motion stroke of the pistons is reduced, the service life and reliability of the power piston plate spring 220 supporting the power piston 210 and the gas distribution piston plate spring 130 supporting the gas distribution pistons 110 can also be obviously improved, the structural size of the engine is reduced, the operating frequency is improved, and higher output can be realized under a more compact structure.
In embodiments of the invention, unless expressly stated or limited otherwise, a first feature may be "on" or "under" a second feature such that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediary. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
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 (9)

1. A co-cavity opposed, split free-piston stirling engine, comprising:
the at least one group of hot cylinders are internally provided with a plurality of gas distribution pistons which are arranged in pairs;
the cold air cylinder group is internally provided with a plurality of power pistons which are arranged oppositely in pairs;
a single air distribution piston or a plurality of groups of air distribution pistons are surrounded with a hot cavity, and one side of the air distribution piston, which is far away from the hot cavity, is provided with a first back pressure cavity; the single power piston or the multiple groups of power pistons are provided with a first cold cavity in a surrounding mode, and one side, far away from the first cold cavity, of the power piston is a second back pressure cavity communicated with the first back pressure cavity.
2. A co-chamber opposed, split free piston stirling engine according to claim 1 wherein a partition and a displacer plate spring are provided at one end of the displacer remote from the other displacer disposed in opposition;
the partition board is connected with the hot cylinder, the distribution piston is provided with a distribution piston rod, and the distribution piston plate spring is connected with the distribution piston rod and the hot cylinder.
3. A co-chamber opposed, split free piston stirling engine in accordance with claim 1 wherein one end of said power piston remote from the other of said oppositely disposed power pistons is provided with a power piston plate spring;
and the power piston is provided with a power piston rod, and the power piston plate spring is connected with the power piston rod and the cold air cylinder.
4. A co-chamber opposed split free piston stirling engine according to claim 2 wherein a second cold chamber is provided between the displacer and the diaphragm;
and a connecting pipe is arranged between the hot air cylinder and the cold air cylinder, one end of the connecting pipe is communicated with the second cold cavity, and the other end of the connecting pipe is communicated with the first cold cavity.
5. A co-chamber opposed split free piston Stirling engine according to claim 4, wherein a heater is further provided outside the hot cylinder, one end of the heater is in communication with the hot chamber, the other end of the heater is connected to a regenerator and a cooler, one end of the cooler is connected to the regenerator, and the other end of the cooler is in communication with the second cold chamber.
6. A co-chamber opposed split free piston Stirling engine according to claim 5, wherein the hot cylinder and the cold cylinder are externally provided with pressure stabilizing pipes respectively connecting the first back pressure chamber and the second back pressure chamber to put all of the first back pressure chamber and the second back pressure chamber in communication.
7. A co-chamber opposed, split free-piston stirling engine in accordance with claim 1 wherein a linear motor is provided in addition to the cold cylinder for generating electricity from the linear motor by the reciprocating motion of the power piston.
8. A co-chamber opposed, split free piston stirling engine in accordance with claim 1 wherein said displacer piston and said power piston reciprocate within said hot cylinder and said cold cylinder respectively with a predetermined phase difference.
9. A co-cavity opposed, split free piston stirling engine in accordance with claim 8 wherein the desired value of the predetermined phase difference is 90 degrees.
CN202110725938.XA 2021-06-29 2021-06-29 Split free piston Stirling engine with opposite common cavities Pending CN115539239A (en)

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