CN115355086B - Single-cylinder free-piston internal combustion power generation system and working method - Google Patents
Single-cylinder free-piston internal combustion power generation system and working method Download PDFInfo
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- CN115355086B CN115355086B CN202211029006.2A CN202211029006A CN115355086B CN 115355086 B CN115355086 B CN 115355086B CN 202211029006 A CN202211029006 A CN 202211029006A CN 115355086 B CN115355086 B CN 115355086B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 83
- 238000010248 power generation Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000007246 mechanism Effects 0.000 claims abstract description 74
- 230000005540 biological transmission Effects 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 18
- 230000033001 locomotion Effects 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims 1
- 230000006872 improvement Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 230000002000 scavenging effect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B71/00—Free-piston engines; Engines without rotary main shaft
- F02B71/04—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
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- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/026—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle three
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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)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a single-cylinder free piston internal combustion power generation system and a working method, wherein a free piston engine comprises a cylinder and a piston which reciprocates in the cylinder, the piston divides the cylinder into a high-pressure air source cylinder and a combustion cylinder which are separated, and a valve air inlet mechanism, a spark plug and a valve exhaust mechanism are arranged on the wall of the combustion cylinder; the high-pressure gas source mechanism comprises a high-pressure gas storage tank and a low-pressure gas storage tank, and the high-pressure gas storage tank and the low-pressure gas storage tank are connected with the high-pressure gas source cylinder through corresponding gas pipelines; the linear generator comprises a linear motor stator and a linear motor rotor which are matched, the linear motor rotor is fixedly arranged on a connecting rod, and one end of the connecting rod is fixedly connected with the piston; the spring return mechanism comprises a return cylinder and a return spring, one end of the return spring is fixedly connected to the other end of the connecting rod, and the other end of the return spring is fixedly connected to the return cylinder. The invention realizes the two-stroke and four-stroke combustion mode of the free piston internal combustion power generation system, and the high-pressure air source assists in starting, so that the stable operation capability of the system is improved.
Description
Technical Field
The invention belongs to the technical field of energy power, relates to a single-cylinder free piston internal combustion power generation system, and in particular relates to a single-cylinder free piston internal combustion power generation system with variable stroke and stable operation and a working method.
Background
The free piston internal combustion engine is directly coupled with the linear motor to form a free piston linear internal combustion power generation system, and the system has simple structure and compact structure and is regarded as a novel energy conversion system capable of replacing the traditional internal combustion engine in the future. In the running process of the system, the motion assembly makes linear reciprocating motion, and the linear motor rotor and the stator move mutually to generate electric energy.
The working process of the internal combustion engine generally comprises four working processes of air intake, compression, work doing and exhaust; when the working mode of the engine is two strokes, the engine works once through two strokes; when the working mode is four strokes, the engine performs work once to the outside through four strokes. The free piston engine generally adopts a two-stroke combustion mode, and the defects of low scavenging efficiency and poor scavenging effect are generally existed; meanwhile, the control difficulty is increased due to free movement of the movement assembly, and the overall operation stability of the system is poor.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a single-cylinder free piston internal combustion power generation system with variable stroke and stable operation.
The invention discloses a single-cylinder free piston internal combustion power generation system, which comprises: the device comprises a free piston engine, a high-pressure air source mechanism, a linear generator and a spring return mechanism;
the free piston engine comprises a cylinder and a piston which reciprocates in the cylinder, the piston divides the cylinder into a high-pressure air source cylinder and a combustion cylinder which are isolated, and a valve air inlet mechanism, a spark plug and a valve exhaust mechanism are arranged on the wall of the combustion cylinder;
the high-pressure air source mechanism comprises a high-pressure air storage tank and a low-pressure air storage tank, the high-pressure air storage tank is connected with the high-pressure air source cylinder through a high-pressure air transmission pipeline, the low-pressure air storage tank is connected with the high-pressure air source cylinder through a low-pressure air transmission pipeline, and control valves are arranged on the high-pressure air transmission pipeline and the low-pressure air transmission pipeline;
the linear generator comprises a linear motor stator and a linear motor rotor which are matched, the linear motor rotor is fixedly arranged on a connecting rod, and one end of the connecting rod is fixedly connected with the piston;
the spring return mechanism comprises a return cylinder and a return spring, one end of the return spring is fixedly connected with the other end of the connecting rod through a mechanical connecting mechanism, and the other end of the return spring is fixedly connected to the return cylinder.
As a further improvement of the present invention, a head of the cylinder is mounted on the combustion cylinder, and the valve intake mechanism, the spark plug, and the valve exhaust mechanism are mounted on the head.
As a further improvement of the invention, a first high-pressure air source cylinder air ring and a second high-pressure air source cylinder air ring are arranged at the connection part of the piston and the air cylinder, which is close to the high-pressure air source cylinder, and a first combustion cylinder air ring and a second combustion cylinder air ring are arranged at the connection part of the piston and the air cylinder, which is close to the combustion cylinder.
As a further improvement of the invention, the control valve arranged on the high-pressure gas pipeline comprises a high-pressure one-way valve and a high-pressure regulating valve, and the control valve arranged on the low-pressure gas pipeline comprises a low-pressure one-way valve and a low-pressure regulating valve.
As a further improvement of the invention, the piston, the connecting rod, the linear motor rotor and the return spring are coaxially arranged with the mechanical connecting mechanism and jointly form a motion assembly which reciprocates linearly along the motion direction of the piston.
As a further development of the invention, the return spring is in an initial state with the piston between the bottom dead center and the top dead center of the free-piston engine.
As a further improvement of the invention, the valve air inlet mechanism and the valve air outlet mechanism are electromagnetic valves, and can realize two-stroke and four-stroke working modes according to the system operation requirement; the high-pressure air source mechanism selects a two-stroke mode or a four-stroke mode corresponding to movement according to the working modes of the valve air inlet mechanism and the valve air outlet mechanism.
The invention also discloses a working method based on the single-cylinder free piston internal combustion power generation system, which comprises the following steps:
a starting stage: the high-pressure gas in the high-pressure gas storage tank enters the high-pressure gas source cylinder through the high-pressure gas transmission pipeline to push the piston to move towards the combustion cylinder side to compress the combustible mixed gas, and the spark plug works after the combustible mixed gas reaches the ignition position to realize the ignition process;
stable power generation phase: after the high-pressure gas in the high-pressure gas source cylinder finishes working, the high-pressure gas is discharged into the low-pressure gas storage tank through the low-pressure gas transmission pipeline, so that the gas pressure in the high-pressure gas source cylinder is ensured to be atmospheric pressure; at the moment, the high-temperature high-pressure gas combusted in the combustion cylinder pushes the piston to move to the high-pressure gas source cylinder side, the return spring and the gas in the high-pressure gas source cylinder have certain rebound capability after being compressed, and the piston is pushed back to the ignition position again under the auxiliary action that the high-pressure gas in the high-pressure gas storage tank enters the high-pressure gas source cylinder through the high-pressure gas transmission pipeline, so that the stable operation of the system is realized.
As a further improvement of the present invention, there is also included:
after the system encounters fire, a motion assembly formed by a connecting rod, a piston and the like is difficult to reach the next ignition position due to insufficient compression, a high-pressure air source mechanism starts a fire plan, the air pressure entering a high-pressure air source cylinder is improved, the restoring capacity of the piston is improved, the motion assembly can reach the ignition position, the frequency of system fire shutdown is reduced, and the stable operation capacity of the system is improved.
As a further improvement of the present invention, there is also included:
when the combustion pressure is insufficient or is too high due to fluctuation of air intake or oil injection, the position of a piston operation dead center can be stabilized by adjusting the gas pressure in the high-pressure gas source mechanism, and the system operation stability is improved to a certain extent.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize the free piston internal combustion power generation system to work in a two-stroke combustion mode and a four-stroke combustion mode by utilizing the assistance of a high-pressure air source, has the advantages of quick start and stable operation, and has important significance for popularization and application of the free piston internal combustion power generation system.
Drawings
FIG. 1 is a schematic diagram of a single cylinder free piston internal combustion power generation system with variable stroke and stable operation according to one embodiment of the present invention.
In the figure:
1. a return cylinder; 2. a return spring; 3. a mechanical connection member; 4. a linear motor stator; 5. a linear motor mover; 6. a connecting rod; 7. a high pressure check valve; 8. a high pressure regulating valve; 9. a high pressure gas line; 10. a high pressure gas storage tank; 11. a cylinder; 12. a cylinder cover; 13. a valve air inlet mechanism; 14. a spark plug; 15. a valve exhaust mechanism; 16. a piston; 17. a first combustion cylinder gas ring; 18. a second combustion cylinder gas ring; 19. a first high-pressure air source cylinder air ring; 20. a second high-pressure air source cylinder air ring; 21. a low pressure gas storage tank; 22. a low pressure regulating valve; 23. a low pressure check valve; 24. low pressure gas pipeline.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is described in further detail below with reference to the attached drawing figures:
the invention provides a single-cylinder free piston internal combustion power generation system with variable stroke and stable operation, which comprises the following components: the device comprises a free piston engine, a high-pressure air source mechanism, a linear generator and a spring return mechanism; the free piston engine comprises a cylinder and a piston which reciprocates in the cylinder, and the piston divides the cylinder into a high-pressure air source cylinder and a combustion cylinder which are isolated; the high-pressure gas source pushes the piston to compress the combustible mixed gas to achieve the ignition condition, so that the system starting process can be realized, and the dependence on a linear motor during free piston starting can be avoided; the two-stroke and four-stroke combustion modes can be realized by means of the high-pressure air source and the adjustment of the air distribution phase of the air inlet valve and the air outlet valve, and the switching is free; when the system is in a fire state, the high-pressure air source intervenes to push the piston to reach the ignition position, so that the fire rate of the system is reduced, and the stable operation of the system is assisted.
Specific:
as shown in fig. 1, the present invention provides a single cylinder free piston internal combustion power generation system with variable stroke and stable operation, comprising: the device comprises a free piston engine, a high-pressure air source mechanism, a linear generator and a spring return mechanism; wherein,,
the free piston engine of the present invention includes: the cylinder 11, the cylinder cover 12, the valve air inlet mechanism 13, the valve exhaust mechanism 15, the spark plug 14, the piston 16, the first combustion cylinder air ring 17, the second combustion cylinder air ring 18, the first high-pressure air source cylinder air ring 19 and the second high-pressure air source cylinder air ring 20; wherein, the piston 16 moves linearly and reciprocally in the cylinder 11, and the piston 16 divides the cylinder 11 into a high-pressure air source cylinder and a combustion cylinder which are isolated, the cylinder cover 12 is mounted on the combustion cylinder, and the valve air inlet mechanism 13, the valve air exhaust mechanism 15 and the spark plug 14 are mounted on the cylinder cover 12 for air inlet, air exhaust and ignition into the combustion cylinder. In order to ensure the sealing performance between the high-pressure air source cylinder and the combustion cylinder, a first high-pressure air source cylinder air ring 19 and a second high-pressure air source cylinder air ring 20 are arranged at the joint of the piston 16 and the cylinder 11 near the high-pressure air source cylinder, and a first combustion cylinder air ring 17 and a second combustion cylinder air ring 18 are arranged at the joint of the piston 16 and the cylinder 11 near the combustion cylinder. When the system moves, the piston 16 moves rightward (combustion cylinder side) to compress the combustion cylinder interior gas, and the piston 16 moves leftward (high-pressure gas source cylinder side) to compress the high-pressure gas source cylinder interior gas.
The high-pressure air source mechanism comprises a high-pressure one-way valve 7, a high-pressure regulating valve 8, a high-pressure air transmission pipeline 9, a high-pressure air storage tank 10, a low-pressure air storage tank 21, a low-pressure regulating valve 22, a low-pressure one-way valve 23 and a low-pressure air transmission pipeline 24; the high-pressure gas storage tank 10 is connected with the high-pressure gas source cylinder through a high-pressure gas transmission pipeline 9, and the low-pressure gas storage tank 21 is connected with the high-pressure gas source cylinder through a low-pressure gas transmission pipeline 24; the high-pressure gas pipeline 9 and the low-pressure gas pipeline 24 are respectively provided with a control valve, namely, the high-pressure gas pipeline 9 is provided with a high-pressure one-way valve 7 and a high-pressure regulating valve 8, and the low-pressure gas pipeline 24 is provided with a low-pressure one-way valve 23 and a low-pressure regulating valve 22. When the hydraulic cylinder is used, the high-pressure air is controlled to enter the high-pressure air source cylinder through the pressure check valve 7 and the low-pressure check valve 23, the high-pressure air after acting in the high-pressure air source cylinder is discharged, and the air pressure in the high-pressure air source cylinder is ensured to be atmospheric pressure. Meanwhile, the high-pressure gas pressure entering the high-pressure gas source cylinder can be controlled by adjusting the pressure regulating valve 8 and the low-pressure regulating valve 22.
The linear generator comprises a linear motor stator 4 and a linear motor rotor 5 which are matched, wherein the linear motor rotor 5 is fixedly arranged on a connecting rod 6, and one end of the connecting rod 6 is fixedly connected with a piston 16. The spring return mechanism comprises a return cylinder 1 and a return spring 2, wherein one end of the return spring 2 is fixedly connected with the other end of a connecting rod 6 through a mechanical connecting mechanism 3, and the other end of the return spring 2 is fixedly connected with the return cylinder 1; the piston 16, the connecting rod 6, the linear motor rotor 5 and the return spring 2 are coaxially arranged with the mechanical connecting mechanism 3, and form a motion assembly which reciprocates linearly along the motion direction of the piston 16. Further, the return spring 2 is in an initial state, the piston 16 is located between the bottom dead center and the top dead center of the free piston engine; when the piston 16 is at the far right (top dead center), the return spring 2 is stretched; when the piston 16 is at the leftmost side (bottom dead center), the return spring 2 is compressed.
Furthermore, the air valve air inlet mechanism 13 and the air valve air outlet mechanism 15 are all electromagnetic air valves, and can realize two-stroke and four-stroke working modes according to the running requirements of the system; the high-pressure air source mechanism also needs to operate in the two-stroke mode when the valve intake mechanism 13 and the valve exhaust mechanism 15 are in the two-stroke mode, and the four-stroke mode when the valve intake mechanism 13 and the valve exhaust mechanism 15 are in the four-stroke mode.
The invention provides a working method based on the single-cylinder free-piston internal combustion power generation system, which comprises the following steps:
a starting stage: the high-pressure gas in the high-pressure gas storage tank 10 enters a high-pressure gas source cylinder (the high-pressure one-way valve 7 is opened, the low-pressure one-way valve 23 is closed) through the high-pressure gas transmission pipeline 9, the piston 16 is pushed to move towards the combustion cylinder side (right side) to compress the combustible mixed gas, and after the combustible mixed gas reaches an ignition position, the spark plug 14 works to realize an ignition process;
stable power generation phase: after the high-pressure gas in the high-pressure gas source cylinder finishes working, the high-pressure gas is discharged into the low-pressure gas storage tank 21 through the low-pressure gas transmission pipeline 24 (the high-pressure check valve 7 is closed and the low-pressure check valve 23 is opened), so that the gas pressure in the high-pressure gas source cylinder is ensured to be atmospheric pressure; at this time, the high-temperature and high-pressure gas combusted in the combustion cylinder pushes the piston 16 to move to the side (left side) of the high-pressure gas source cylinder, the return spring 2 and the gas in the high-pressure gas source cylinder have certain rebound capability after compression, and the high-pressure gas in the high-pressure gas storage tank 10 enters the high-pressure gas source cylinder through the high-pressure gas transmission pipeline 9 to assist, so that the piston is pushed back to the right ignition position again, and stable operation of the system is realized;
after the system encounters fire, the motion assembly formed by the connecting rod 6, the piston 16 and the like is difficult to reach the next ignition position due to insufficient compression, the high-pressure air source mechanism starts the fire plan, the gas pressure entering the high-pressure air source cylinder is improved by adjusting the high-pressure regulating valve 8, the restoring capacity of the piston 16 is improved, the motion assembly can reach the ignition position, the frequency of system fire shutdown is reduced, and the stable operation capacity of the system is improved.
When the combustion pressure is insufficient or is too high due to fluctuation of air intake or oil injection, the position of a piston operation dead center can be stabilized by adjusting the gas pressure in the high-pressure gas source mechanism, and the system operation stability is improved to a certain extent.
Example 1
When the single-cylinder free piston internal combustion power generation system works in a two-stroke combustion mode:
after the ignition process is finished, the system runs from the rightmost side (top dead center) to the left side, and at the moment, high-temperature high-pressure gas in the cylinder pushes the piston 16 to move to perform a working process; when the exhaust phase (near the top dead center) is reached, the valve exhaust mechanism 15 works to exhaust the combustion exhaust gas in the cylinder, after the intake phase (near the bottom dead center) is reached, the valve intake mechanism 13 works, fresh air enters the combustion cylinder and the scavenging process is realized, in the process that the piston 16 runs leftwards, the high-pressure air source mechanism ensures that the air pressure in the high-pressure air source cylinder is atmospheric pressure, and after the air pressure reaches the leftmost side (near the bottom dead center), the high-pressure air source mechanism works, the auxiliary movement component runs rightwards and compresses the combustible mixture. After the exhaust and air intake processes are realized, the air inlet valve mechanism 13 and the air outlet valve mechanism 15 are closed to the air inlet valve and the air outlet valve, the compression process is carried out, the spark plug 14 works after the ignition position is reached, and the ignition process is realized, so that after the piston 16 returns to the upper dead center from the upper dead center to the lower dead center, the free piston internal combustion engine works once outwards, and the two-stroke combustion working mode is realized.
Example 2
When the single-cylinder free piston internal combustion power generation system works in a four-stroke combustion mode:
after the ignition process is finished, the system moves from the top dead center to the left side, high-temperature high-pressure gas in the cylinder pushes the piston 16 to move at the moment, the working process is carried out, in the process of moving the piston 16 leftwards, the high-pressure gas source mechanism guarantees that the gas pressure in the high-pressure gas source cylinder is atmospheric pressure, after reaching the bottom dead center, the high-pressure gas source mechanism works, the auxiliary moving component moves rightwards, when reaching the exhaust phase, the valve exhaust mechanism 15 works, the exhaust valve is opened, after reaching the top dead center again, the return spring 2 stretches, the moving component has the capability of moving leftwards, after reaching the air inlet phase, the valve air inlet mechanism 13 works, after the exhaust and air inlet processes are realized, the valve air inlet mechanism 13 and the valve exhaust mechanism 15 are closed, the piston 16 moves leftwards, at the moment, the high-pressure gas source mechanism guarantees that the gas pressure in the high-pressure gas source cylinder is atmospheric pressure, after reaching the leftmost side (bottom dead center), the high-pressure gas source mechanism works again, the piston 16 is pushed to move rightwards, the compression process is carried out, after reaching the ignition position, the spark plug 14 works, and the ignition process is realized. Therefore, the free piston internal combustion engine does work once outwards through four strokes of top dead center-bottom dead center-top dead center, so that a four-stroke combustion working mode is realized.
The invention has the advantages that:
the invention can realize the free piston internal combustion power generation system to work in a two-stroke combustion mode and a four-stroke combustion mode by utilizing the assistance of a high-pressure air source, has the advantages of quick start and stable operation, and has important significance for popularization and application of the free piston internal combustion power generation system.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A single cylinder free piston internal combustion power generation system comprising: the device comprises a free piston engine, a high-pressure air source mechanism, a linear generator and a spring return mechanism;
the free piston engine comprises a cylinder and a piston which reciprocates in the cylinder, the piston divides the cylinder into a high-pressure air source cylinder and a combustion cylinder which are isolated, and a valve air inlet mechanism, a spark plug and a valve exhaust mechanism are arranged on the wall of the combustion cylinder;
the high-pressure air source mechanism comprises a high-pressure air storage tank and a low-pressure air storage tank, the high-pressure air storage tank is connected with the high-pressure air source cylinder through a high-pressure air transmission pipeline, the low-pressure air storage tank is connected with the high-pressure air source cylinder through a low-pressure air transmission pipeline, and control valves are arranged on the high-pressure air transmission pipeline and the low-pressure air transmission pipeline;
the linear generator comprises a linear motor stator and a linear motor rotor which are matched, the linear motor rotor is fixedly arranged on a connecting rod, and one end of the connecting rod is fixedly connected with the piston;
the spring return mechanism comprises a return cylinder and a return spring, one end of the return spring is fixedly connected with the other end of the connecting rod through a mechanical connecting mechanism, and the other end of the return spring is fixedly connected to the return cylinder.
2. The single cylinder free piston internal combustion power generation system of claim 1 wherein the cylinder head of said cylinder is mounted to said combustion cylinder and said valve inlet mechanism, spark plug and valve exhaust mechanism are mounted to said cylinder head.
3. The single cylinder, free piston internal combustion power generation system of claim 1 wherein said piston and said cylinder are provided with a first high pressure source cylinder gas ring and a second high pressure source cylinder gas ring at a junction proximate to the high pressure source cylinder, said piston and said cylinder being provided with a first combustion cylinder gas ring and a second combustion cylinder gas ring at a junction proximate to the combustion cylinder.
4. The single cylinder free piston internal combustion power generation system of claim 1, wherein the control valve provided on the high pressure gas line comprises a high pressure check valve and a high pressure regulating valve, and the control valve provided on the low pressure gas line comprises a low pressure check valve and a low pressure regulating valve.
5. The single cylinder free piston internal combustion power generation system of claim 1 wherein the piston, connecting rod, linear motor mover, return spring are coaxially disposed with the mechanical linkage and together form a moving assembly that reciprocates linearly in the direction of piston movement.
6. The single cylinder free piston internal combustion power generation system of claim 1 wherein said return spring is in an initial state with said piston between bottom dead center and top dead center of said free piston engine.
7. The single cylinder free piston internal combustion power generation system of claim 1 wherein the valve intake mechanism and the valve exhaust mechanism are both electromagnetic valves, and two-stroke and four-stroke modes of operation can be achieved according to system operating requirements; the high-pressure air source mechanism selects a two-stroke mode or a four-stroke mode corresponding to movement according to the working modes of the valve air inlet mechanism and the valve air outlet mechanism.
8. A method of operating a single cylinder free piston internal combustion power generation system based on any one of claims 1 to 7, comprising:
a starting stage: the high-pressure gas in the high-pressure gas storage tank enters the high-pressure gas source cylinder through the high-pressure gas transmission pipeline to push the piston to move towards the combustion cylinder side to compress the combustible mixed gas, and the spark plug works after the combustible mixed gas reaches the ignition position to realize the ignition process;
stable power generation phase: after the high-pressure gas in the high-pressure gas source cylinder finishes working, the high-pressure gas is discharged into the low-pressure gas storage tank through the low-pressure gas transmission pipeline, so that the gas pressure in the high-pressure gas source cylinder is ensured to be atmospheric pressure; at the moment, the high-temperature high-pressure gas combusted in the combustion cylinder pushes the piston to move to the high-pressure gas source cylinder side, the return spring and the gas in the high-pressure gas source cylinder have certain rebound capability after being compressed, and the piston is pushed back to the ignition position again under the auxiliary action that the high-pressure gas in the high-pressure gas storage tank enters the high-pressure gas source cylinder through the high-pressure gas transmission pipeline, so that the stable operation of the system is realized.
9. The method of operation of claim 8, further comprising:
after the system encounters a fire, the high-pressure air source mechanism starts a fire plan, improves the pressure of air entering the high-pressure air source cylinder, and improves the restoring capability of the piston, so that the moving assembly can reach the ignition position.
10. The method of operation of claim 8, further comprising:
when the combustion pressure is insufficient or too high due to fluctuation of intake air or fuel injection, the position of the operation dead point of the piston is stabilized by adjusting the gas pressure in the high-pressure gas source mechanism.
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| CN202211029006.2A CN115355086B (en) | 2022-08-25 | 2022-08-25 | Single-cylinder free-piston internal combustion power generation system and working method |
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| CN202211029006.2A CN115355086B (en) | 2022-08-25 | 2022-08-25 | Single-cylinder free-piston internal combustion power generation system and working method |
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| CN115355086B true CN115355086B (en) | 2023-09-29 |
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| FR1075224A (en) * | 1951-12-28 | 1954-10-14 | Alan Muntz & Co Ltd | Improvements made to the start-up of free-piston machines powered by internal combustion |
| CN1261944A (en) * | 1997-07-01 | 2000-08-02 | 圣波尔股份有限公司 | Free piston IC engine |
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