CN115355086A - 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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- CN115355086A CN115355086A CN202211029006.2A CN202211029006A CN115355086A CN 115355086 A CN115355086 A CN 115355086A CN 202211029006 A CN202211029006 A CN 202211029006A CN 115355086 A CN115355086 A CN 115355086A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010248 power generation Methods 0.000 title claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 75
- 230000005540 biological transmission Effects 0.000 claims abstract description 29
- 230000033001 locomotion Effects 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 98
- 230000006872 improvement Effects 0.000 description 9
- 230000002000 scavenging effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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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- 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 thereof, wherein a free piston engine comprises a cylinder and a piston reciprocating in the cylinder, the piston divides the cylinder into a high-pressure air source cylinder and a combustion cylinder which are separated from each other, and the cylinder wall of the combustion cylinder is provided with an air valve air inlet mechanism, a spark plug and an air valve exhaust mechanism; 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 transmission 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 that the free piston internal combustion power generation system gives consideration to two-stroke and four-stroke combustion modes, and the high-pressure air source assists in starting, thereby improving the stable operation capability of the system.
Description
Technical Field
The invention belongs to the technical field of energy power, and relates to a single-cylinder free piston internal combustion power generation system, in particular 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 and the linear motor are directly coupled to form a free piston linear internal combustion power generation system, the system is simple in structure and compact in structure, and the system is taken as a novel energy conversion system capable of replacing a traditional internal combustion engine in the future. In the operation process of the system, the motion assembly makes linear reciprocating motion, and the rotor and the stator of the linear motor move mutually to generate electric energy.
The working process of the internal combustion engine generally comprises four working processes of air inlet, compression, work application and air exhaust; when the working mode of the engine is two strokes, the engine does work once after two strokes; when the working mode is four strokes, the engine works once after four strokes. The free piston engine generally adopts a two-stroke combustion mode, and has the defects of low scavenging efficiency and poor air exchange effect generally; meanwhile, due to the free movement of the moving assembly, the control difficulty is increased, 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 system 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 reciprocating in the cylinder, the piston divides the cylinder into a high-pressure air source cylinder and a combustion cylinder which are separated from each other, 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, the high-pressure gas storage tank is connected with the high-pressure gas source cylinder through a high-pressure gas transmission pipeline, the low-pressure gas storage tank is connected with the high-pressure gas source cylinder through a low-pressure gas transmission pipeline, and control valves are arranged on the high-pressure gas transmission pipeline and the low-pressure gas 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 to 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 cylinder head of the cylinder is mounted on the combustion cylinder, and the valve intake mechanism, the ignition plug, and the valve exhaust mechanism are mounted on the cylinder 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 joint of the piston and the 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 joint of the piston and the cylinder, which is close to the combustion cylinder.
As a further improvement of the invention, the control valve arranged on the high-pressure gas transmission pipeline comprises a high-pressure one-way valve and a high-pressure regulating valve, and the control valve arranged on the low-pressure gas transmission 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, the return spring and the mechanical connecting mechanism are coaxially arranged and jointly form a motion assembly which linearly reciprocates along the motion direction of the piston.
As a further improvement of the present invention, in the initial state of the return spring, the piston is located between a bottom dead center and a top dead center of the free piston engine.
As a further improvement of the invention, the valve air inlet mechanism and the valve exhaust mechanism are both electromagnetic valves, and two-stroke and four-stroke working modes can be realized according to the operation requirement of the system; and the high-pressure air source mechanism selects a two-stroke mode or a four-stroke mode corresponding to motion 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: high-pressure gas in the high-pressure gas storage tank enters a high-pressure gas source cylinder through a high-pressure gas transmission pipeline, a piston is pushed to move towards the combustion cylinder side to compress combustible mixed gas, and after the combustible mixed gas reaches an ignition position, a spark plug works to realize an ignition process;
and (3) a stable power generation stage: after finishing working, the high-pressure gas in the high-pressure gas source cylinder is discharged into a low-pressure gas storage tank through a 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 after combustion in the combustion cylinder pushes the piston to move towards the high-pressure gas source cylinder, the return spring and the gas in the high-pressure gas source cylinder have certain resilience through compression, 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 invention, the method also comprises the following steps:
after the system meets with catching fire, the motion subassembly that constitutes such as connecting rod, piston is difficult to reach next ignition position because the compression is not enough, and high-pressure air supply mechanism starts the plan of catching fire, improves the gas pressure that gets into in the high-pressure air supply jar, promotes the resilience of piston for the motion subassembly can reach the ignition position, reduces the frequency that the system stopped down on catching fire, improves the steady operation ability of system.
As a further improvement of the invention, the method also comprises the following steps:
when the combustion pressure is insufficient or too high due to air intake or oil injection fluctuation, the position of a piston operation stop point can be stabilized by adjusting the gas pressure in the high-pressure gas source mechanism, and the operation stability of the system is improved to a certain extent.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize that the free piston internal combustion power generation system can work in a two-stroke combustion mode and a four-stroke combustion mode by using the assistance of the high-pressure air source, has the advantages of quick start and stable operation, and has important significance for the popularization and the application of the free piston internal combustion power generation system.
Drawings
Fig. 1 is a schematic structural diagram of a single-cylinder free-piston internal combustion power generation system with variable stroke and stable operation, which is disclosed by an embodiment of the invention.
In the figure:
1. a recovery cylinder; 2. a return spring; 3. a mechanical connecting 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 transmission pipeline; 10. a high pressure gas storage tank; 11. a cylinder; 12. a cylinder cover; 13. a valve intake 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 gas source cylinder gas ring; 20. a second high pressure gas source cylinder gas ring; 21. a low pressure gas reservoir; 22. a low pressure regulating valve; 23. a low pressure check valve; 24. low-pressure gas transmission pipelines.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
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 system 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 reciprocating in the cylinder, and the piston divides the cylinder into a high-pressure air source cylinder and a combustion cylinder which are separated from each other; the high-pressure gas source pushes the piston to compress the combustible mixed gas to achieve ignition conditions, so that the system starting process can be realized, and the dependence on a linear motor when a free piston is started can be avoided; the two-stroke and four-stroke combustion modes can be realized by adjusting the distribution phases of the high-pressure air source and the air inlet and outlet valves, and the switching is free; when the system is in a fire catching state, the high-pressure air source intervenes to push the piston to reach the ignition position, so that the fire catching rate of the system is reduced, and the stable operation of the system is assisted.
Specifically, the method comprises the following steps:
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 system 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 comprises: the device comprises a cylinder 11, a cylinder cover 12, a valve inlet mechanism 13, a valve exhaust mechanism 15, a spark plug 14, a piston 16, a first combustion cylinder air ring 17, a second combustion cylinder air ring 18, a first high-pressure air source cylinder air ring 19 and a second high-pressure air source cylinder air ring 20; the piston 16 linearly reciprocates in the cylinder 11, the piston 16 divides the cylinder 11 into a high-pressure air source cylinder and a combustion cylinder which are separated, the cylinder cover 12 is mounted on the combustion cylinder, and the valve air inlet mechanism 13, the valve exhaust mechanism 15 and the spark plug 14 are mounted on the cylinder cover 12 and used for air inlet, air exhaust and ignition in the combustion cylinder. In order to ensure the sealing 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, which is close to 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, which is close to the combustion cylinder. When the system moves, the piston 16 moves towards the right (combustion cylinder side) to compress the gas in the combustion cylinder, and the piston 16 moves towards the left (high-pressure gas source cylinder side) to compress the gas in the high-pressure gas source cylinder.
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; wherein, 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; control valves are arranged on the high-pressure gas transmission pipeline 9 and the low-pressure gas transmission pipeline 24, namely, a high-pressure check valve 7 and a high-pressure regulating valve 8 are arranged on the high-pressure gas transmission pipeline 9, and a low-pressure check valve 23 and a low-pressure regulating valve 22 are arranged on the low-pressure gas transmission pipeline 24. When the high-pressure air source cylinder is used, the high-pressure air is controlled to be fed into the high-pressure air source cylinder and the high-pressure air which does work in the high-pressure air source cylinder is discharged through the pressure one-way valve 7 and the low-pressure one-way valve 23, and the air pressure in the high-pressure air source cylinder is ensured to be the atmospheric pressure. Meanwhile, the pressure of the high-pressure air entering the high-pressure air source cylinder can be controlled by adjusting the pressure adjusting valve 8 and the low-pressure adjusting 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 to 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 to the return cylinder 1; the piston 16, the connecting rod 6, the linear motor rotor 5, the return spring 2 and the mechanical connecting mechanism 3 are coaxially arranged, and jointly form a motion assembly which linearly reciprocates along the motion direction of the piston 16. Further, when the return spring 2 is in the 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 extreme right (top dead centre), the return spring 2 is extended; when the piston 16 is at the leftmost side (bottom dead center), the return spring 2 is compressed.
Furthermore, the valve air inlet mechanism 13 and the valve exhaust mechanism 15 are both electromagnetic valves, and can realize two-stroke and four-stroke working modes according to the system operation requirement; when the valve intake mechanism 13 and the valve exhaust mechanism 15 are in the two-stroke operating mode, the high-pressure air source mechanism also needs to operate in the two-stroke operating mode, and when the valve intake mechanism 13 and the valve exhaust mechanism 15 are in the four-stroke operating mode, the high-pressure air source mechanism also needs to operate in the four-stroke operating mode.
The invention provides a working method of a single-cylinder free piston internal combustion power generation system, which comprises the following steps:
a starting stage: high-pressure gas in the high-pressure gas storage tank 10 enters a high-pressure gas source cylinder (a high-pressure one-way valve 7 is opened, a low-pressure one-way valve 23 is closed) through a high-pressure gas transmission pipeline 9, a piston 16 is pushed to move towards the side (the right side) of a combustion cylinder to compress combustible mixed gas, and after the combustible mixed gas reaches an ignition position, a spark plug 14 works to realize an ignition process;
and (3) a stable power generation stage: after the high-pressure gas in the high-pressure gas source cylinder finishes working, the high-pressure gas is discharged into a low-pressure gas storage tank 21 through a low-pressure gas pipeline 24 (the high-pressure one-way valve 7 is closed, and the low-pressure one-way valve 23 is opened), so that the pressure of the gas in the high-pressure gas source cylinder is ensured to be atmospheric pressure; at the moment, the high-temperature and high-pressure gas after combustion 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 resilience through compression, and under the auxiliary action that 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, the piston is pushed back to the right ignition position again, so that the stable operation of the system is realized;
after the system encounters fire, the motion assembly composed of 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 a fire-catching plan, the gas pressure entering a high-pressure air source cylinder is improved by adjusting the high-pressure regulating valve 8, the recovery capacity of the piston 16 is improved, the motion assembly can reach the ignition position, the frequency of the system when the system is on fire and stops is reduced, and the stable operation capacity of the system is improved.
When the combustion pressure is insufficient or too high due to air intake or oil injection fluctuation, the position of a piston operation stop point can be stabilized by adjusting the gas pressure in the high-pressure gas source mechanism, and the operation stability of the system is improved to a certain extent.
Example 1
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 and high-pressure gas in the cylinder pushes the piston 16 to move to perform the working process; when the exhaust phase (close to the top dead center) is reached, the valve exhaust mechanism 15 works to exhaust combustion waste gas in the cylinder, after the exhaust phase (close to the bottom dead center) is reached, the valve intake mechanism 13 works, fresh air enters the combustion cylinder, the scavenging process is realized, in the leftward operation process of the piston 16, the high-pressure air source mechanism ensures that the gas pressure in the high-pressure air source cylinder is atmospheric pressure, and after the left-most side (bottom dead center) is reached, the high-pressure air source mechanism works, the auxiliary motion assembly moves rightwards to compress combustible mixed gas. After the exhaust and intake processes are realized, the valve intake mechanism 13 and the valve exhaust mechanism 15 close the intake valve and the exhaust valve, the compression process is carried out, after the ignition position is reached, the spark plug 14 works to realize the ignition process, so that after the piston 16 returns to the top dead center from the top dead center to the bottom dead center, the free piston internal combustion engine does work once outwards to realize the two-stroke combustion working mode.
Example 2
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 runs from the top dead center to the left side, at the moment, high-temperature high-pressure gas in the cylinder pushes the piston 16 to move to perform a work doing process, in the process that the piston 16 runs leftwards, the high-pressure gas source mechanism ensures that the gas pressure in the high-pressure gas source cylinder is atmospheric pressure, after the piston reaches the bottom dead center, the high-pressure gas source mechanism works, the auxiliary motion assembly runs rightwards, when the exhaust phase is reached, the valve exhaust mechanism 15 works, the exhaust valve is opened, after the upper dead center is reached again, the return spring 2 is stretched, the motion assembly has the capability of running leftwards, after the intake phase is reached, the valve intake mechanism 13 works, after the exhaust and intake processes are realized, the valve intake mechanism 13 and the valve exhaust mechanism 15 are closed, the exhaust valve and the piston 16 runs leftwards, at the moment, the high-pressure gas source mechanism ensures that the gas pressure in the high-pressure gas source cylinder is atmospheric pressure, after the left-most side (bottom dead center) is reached, the high-pressure gas source mechanism works again, the piston 16 is pushed to run rightwards to perform a compression process, after the ignition position is reached, the spark plug 14 works, and the ignition process is realized. Therefore, when the piston passes through four strokes of top dead center-bottom dead center-top dead center, the free piston internal combustion engine applies work to the outside once, and the four-stroke combustion working mode is realized.
The invention has the advantages that:
the invention can realize that the free piston internal combustion power generation system can work in a two-stroke combustion mode and a four-stroke combustion mode by using the assistance of the high-pressure air source, has the advantages of quick start and stable operation, and has important significance for the popularization and the application of the free piston internal combustion power generation system.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement 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 system 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 separated, and a valve air inlet mechanism, a spark plug and a valve exhaust mechanism are arranged on the cylinder 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, the high-pressure gas storage tank is connected with the high-pressure gas source cylinder through a high-pressure gas transmission pipeline, the low-pressure gas storage tank is connected with the high-pressure gas source cylinder through a low-pressure gas transmission pipeline, and control valves are arranged on the high-pressure gas transmission pipeline and the low-pressure gas 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 to 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. A single cylinder, free piston, internal combustion power generating system as recited in claim 1 wherein said cylinder head is mounted to said combustion cylinder, and said valve inlet mechanism, spark plug and valve outlet mechanism are mounted to said cylinder head.
3. The single cylinder free-piston internal combustion power generating system of claim 1, wherein the piston and the cylinder have first and second high pressure air supply cylinder rings adjacent the high pressure air supply cylinder connection, and the piston and the cylinder have first and second combustion cylinder rings adjacent the combustion cylinder connection.
4. The single cylinder free piston internal combustion power generation system of claim 1, wherein the control valve disposed on the high pressure gas line includes a high pressure check valve and a high pressure regulating valve, and the control valve disposed on the low pressure gas line includes 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, the connecting rod, the linear motor mover, the return spring and the mechanical linkage are coaxially disposed and together form a moving assembly that reciprocates linearly in a direction of movement of the piston.
6. The single cylinder free piston internal combustion power generation system of claim 1, wherein the return spring is in an initial state with the piston between bottom dead center and top dead center of the 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 that can achieve two-stroke and four-stroke modes of operation depending on system operating requirements; and the high-pressure air source mechanism selects a two-stroke mode or a four-stroke mode of corresponding motion according to the working modes of the valve air inlet mechanism and the valve exhaust mechanism.
8. A method of operating a single cylinder free piston internal combustion power generation system in accordance with any one of claims 1 to 7, comprising:
a starting stage: high-pressure gas in the high-pressure gas storage tank enters a high-pressure gas source cylinder through a high-pressure gas transmission pipeline, a piston is pushed to move towards the combustion cylinder side to compress combustible mixed gas, and after the combustible mixed gas reaches an ignition position, a spark plug works to realize an ignition process;
and (3) a stable power generation stage: after the high-pressure gas in the high-pressure gas source cylinder finishes working, the high-pressure gas is discharged into a low-pressure gas storage tank through a 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 after combustion in the combustion cylinder pushes the piston to move towards the high-pressure gas source cylinder, the return spring and the gas in the high-pressure gas source cylinder have certain resilience through compression, 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 fire, the high-pressure air source mechanism starts a fire-firing plan, the pressure of air entering a high-pressure air source cylinder is improved, the recovery capacity of the piston is improved, and the movement assembly can reach an ignition position.
10. The method of operation of claim 8, further comprising:
when the combustion pressure is insufficient or too high due to air intake or oil injection fluctuation, the position of the operation stop 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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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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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 |
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| CN102425499A (en) * | 2011-12-19 | 2012-04-25 | 北京理工大学 | Dead point controlled free piston internal combustion linear generator |
| CN109854367A (en) * | 2019-01-22 | 2019-06-07 | 宁波吉利罗佑发动机零部件有限公司 | Single cylinder free piston engine and its working method |
| CN111322155A (en) * | 2020-03-06 | 2020-06-23 | 山西成功汽车制造有限公司 | Free piston type linear power generation device and power generation method thereof |
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