Air-free hybrid power propulsion system based on closed argon circulation piston engine

Abstract

The invention discloses an airless hybrid power propulsion system based on a closed argon circulation piston engine, and relates to the technical field of internal combustion engines. According to the closed argon circulation free piston engine hybrid power propelling system, hydrogen serves as main fuel, zero emission is achieved, detonation control is more stable, the closed argon circulation free piston engine hybrid power propelling system is more suitable for an underwater carrying tool propelling system, a novel horizontally-opposed two-stroke internal combustion engine is applied, the efficient zero-emission function is achieved, and the energy-saving and environment-friendly effects are achieved. A set of argon closed cycle and hybrid power system is established outside the internal combustion engine, the heat efficiency of a combustion system is improved, energy consumption is reduced, recycling of energy is achieved, several detonation restraining methods are provided for a propelling system, the stability of the internal combustion engine in the working process can be effectively improved, and the working efficiency of the internal combustion engine is improved. And the design targets of zero emission, high efficiency and high stability of the internal combustion engine in the future can be met, and argon is used as an acting working medium.

Description

Technical Field

[0001] The present invention relates to the technical field of internal combustion engines, in particular to an airless hybrid propulsion system based on a closed argon cycle piston engine. Background Art

[0002] With the development of society, the country has clearly proposed to actively and steadily promote various low-carbon measures such as carbon neutrality. In order to increase the efforts to promote energy conservation and carbon reduction, pragmatic and effective measures should be taken to make every effort to complete the "binding indicators of energy conservation and carbon reduction." We should improve the regulation of total energy consumption and intensity, focus on controlling fossil energy consumption, strengthen the management of carbon emission intensity, implement special actions for energy conservation and carbon reduction in different fields and industries, do a good job in energy conservation and carbon reduction at a higher level and higher quality, better play the economic, social and ecological benefits of energy conservation and carbon reduction, and lay a solid foundation for achieving the goals of carbon peak and carbon neutrality.

[0003] Under the promotion of national energy conservation and emission reduction policies, traditional internal combustion engines use air as the working fluid. During the combustion process, nitrogen will inevitably react with oxygen to produce nitrogen oxides. Whether nitrogen oxides are treated in the cylinder or outside the cylinder, they will lead to many problems such as reduced efficiency, increased costs, and complex systems.

[0004] Therefore, a new solution to the above problems needs to be proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an airless hybrid propulsion system based on a closed argon cycle piston engine. On the basis of zero emissions of a hydrogen fuel internal combustion engine, the argon closed cycle technology is used to improve the thermal efficiency and stability of the system to solve the technical problems raised in the background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an airless hybrid propulsion system based on a closed argon cycle piston engine, comprising a novel horizontally opposed two-stroke internal combustion engine, a hybrid power assembly and a closed argon cycle assembly;

[0007] The closed argon circulation assembly is equipped with a new horizontally opposed two-stroke internal combustion engine, which realizes the closed circulation of argon, can achieve efficient use of fuel and save resources;

[0008] The new horizontally opposed two-stroke internal combustion engine is connected to a hybrid power component, which is used to convert the output of the new horizontally opposed two-stroke internal combustion engine into a driving force to generate electrical energy, thereby realizing the function of hybrid power. At the same time, by effectively controlling direct current, the system operation is made more stable, saving fuel consumption while also saving electrical energy consumption.

[0009] Preferably, the novel horizontally opposed two-stroke internal combustion engine comprises a housing, the inner side of which is provided with a piston-cylinder assembly, an output shaft and a crank-connecting rod mechanism;

[0010] The piston-cylinder assembly drives the output shaft to rotate through the crank-connecting rod mechanism;

[0011] The housing is provided with.

[0012] Preferably, the piston-cylinder assembly includes a first piston, a first cylinder, a first air intake hole, a first air intake passage, a second cylinder, a second piston, a third piston, a third cylinder, a second air intake passage, a second air intake hole, a fourth cylinder, a fourth piston, a first exhaust port, a spark plug, a first air intake plate, a second exhaust port, a third exhaust port, a second air intake plate, and a fourth exhaust port;

[0013] A first piston and a second piston are provided in the first cylinder and the second cylinder, and the first piston and the second piston respectively reciprocate in the same direction in the first cylinder and the second cylinder; a third piston and a fourth piston are provided in the third cylinder and the fourth cylinder, and the third piston and the fourth piston respectively reciprocate in the same direction in the third cylinder and the fourth cylinder; the reciprocating direction of the first piston and the second piston is opposite to that of the third piston and the fourth piston;

[0014] A first air intake passage is provided above the second cylinder, a first air intake plate is provided below the second cylinder, a first air intake hole is provided at the connection between the second piston and the first piston, a first exhaust port is provided at the first cylinder, and a second exhaust port is provided at the second cylinder;

[0015] A second air intake passage is provided above the fourth cylinder, a second air intake plate is provided below the fourth cylinder, a second air intake hole is provided at the connection between the third piston and the fourth piston, a third exhaust port is provided at the third cylinder, and a fourth exhaust port is provided at the fourth cylinder;

[0016] Spark plugs are provided between the second piston and the first air intake plate and between the third piston and the second air intake plate.

[0017] Preferably, the crank-connecting rod mechanism comprises a first crank, a first connecting rod, a second crank and a second connecting rod;

[0018] The first piston and the second piston are connected by a first connecting rod, and the third piston and the fourth piston are connected by a second connecting rod. The first connecting rod and the second connecting rod convert reciprocating motion into rotation of the output shaft through a first crank and a second crank respectively.

[0019] When the first piston is at the bottom dead center, the second piston is at the top dead center, the first intake port in the combustion chamber is close to the top dead center, and the exhaust valve is close to the bottom dead center. The same applies to the third cylinder and the fourth cylinder.

[0020] Preferably, the hybrid power assembly includes a propulsion device, a drive motor, a generator, a controller and a battery;

[0021] The output shaft is connected to a generator, and the energy generated by combustion is used by the generator to generate electrical energy. At the same time, the controller distributes current to the drive motor and the battery, thereby enabling the drive motor to drive the propulsion device to operate.

[0022] Preferably, the closed argon circulation assembly includes a hydrogen supply pipe, an exhaust manifold and an intake manifold;

[0023] An intake manifold is provided at one end of the hydrogen supply pipe, and an exhaust manifold is provided at the other end of the hydrogen supply pipe. The intake manifold is connected to the first intake duct and the second intake duct, and the exhaust manifold is connected to the first exhaust port, the second exhaust port, the third exhaust port and the fourth exhaust port, thereby forming a closed system.

[0024] Preferably, the hydrogen supply pipe is provided with a hydrogen cylinder, an oxygen cylinder, an argon cylinder, a closed-loop pipeline, a gas-liquid separator, a condenser, oxygen and argon supply pipes and a CO2 capture device;

[0025] The hydrogen cylinder is connected to the hydrogen supply pipe through a pressure regulating valve and a mass flow meter;

[0026] The oxygen cylinder is connected to the oxygen and argon supply pipes through a pressure regulating valve and a mass flow meter;

[0027] The pressure regulating valve and mass flow meter are used to constantly control the flow rates of hydrogen and oxygen, and suppress detonation by changing the equivalence ratio;

[0028] The argon cylinder is connected to the oxygen and argon supply pipes through a pressure regulating valve and a mass flow meter;

[0029] The hydrogen cylinder supplies hydrogen to the new horizontally opposed two-stroke internal combustion engine through the hydrogen supply pipe. At the same time, argon is sealed into the entire cycle in advance. The oxygen cylinder and the argon cylinder supply oxygen and argon to the new horizontally opposed two-stroke internal combustion engine through the oxygen and argon supply pipes. The oxygen, argon and hydrogen form a mixed gas and enter the intake manifold, and then enter the new horizontally opposed two-stroke internal combustion engine together for combustion.

[0030] The exhaust gas is discharged through the exhaust manifold and cooled by the condenser to separate the moisture in the exhaust gas. The moisture can be directly discharged out of the system through the gas-liquid separator.

[0031] The separated argon, incompletely burned hydrogen, and incompletely used oxygen are used as circulating gases. After being replenished with new working fluids through hydrogen cylinders, oxygen cylinders, and argon cylinders, they re-enter the new horizontally opposed two-stroke internal combustion engine for combustion, realizing a closed cycle of argon and enabling effective use of fuel.

[0032] Preferably, a gas analyzer is also included, which is used to detect the proportion of gas components in the pipeline, effectively monitor the mixing degree of the mixed gas and the effect of gas-liquid separation, and facilitate timely replenishment of the gas. During the argon closed circulation process, due to the presence of the gas analyzer, continuous sampling will be performed, thereby consuming part of the working fluid. The argon consumed by the argon cylinder due to sampling is used to ensure that the working fluid is sufficient during the closed circulation process at all times.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention proposes a closed argon cycle free piston engine hybrid propulsion system with hydrogen as the main fuel, which has zero emissions, more stable detonation control, and is more suitable for underwater vehicle propulsion systems. It not only uses a new type of horizontally opposed two-stroke internal combustion engine to achieve high efficiency and zero emissions, but also establishes a set of argon closed cycle and hybrid power system outside the internal combustion engine, which improves the thermal efficiency of the combustion system, reduces energy consumption, and realizes energy recycling. In addition, several methods for suppressing detonation are proposed for the propulsion system, which can effectively improve the stability of the internal combustion engine working process and meet the future design goals of zero emissions, high efficiency and high stability of internal combustion engines. Using argon as the working fluid and adopting an argon closed cycle to solve the argon supply problem can significantly improve the adiabatic index of the working fluid in the thermodynamic cycle and greatly improve the cycle thermal efficiency. At the same time, using hydrogen as the main fuel can achieve zero emissions of CO2, effectively meet the requirements of energy conservation and carbon reduction, and at the same time realize the reuse of resources and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 This is a structural diagram of a novel horizontally opposed two-stroke internal combustion engine of the present invention;

[0037] Figure 2 1 is a structural diagram of the system of the present invention.

[0038] In the figure: 1, first piston; 2, first cylinder; 3, first intake hole; 4, first intake duct; 5, second cylinder; 6, second piston; 7, third piston; 8, third cylinder; 9, second intake duct; 10, second intake hole; 11, fourth cylinder; 12, fourth piston; 13, first exhaust port; 14, spark plug; 15, first intake plate; 16, second exhaust port; 17, third exhaust port; 18, second intake plate; 19, fourth exhaust port; 20, Output shaft; 21. First crank; 22. First connecting rod; 23. Second crank; 24. Second connecting rod; 25. Hydrogen cylinder; 26. Hydrogen supply pipe; 27. Oxygen cylinder; 28. Pressure regulating valve; 29. ​​Mass flow meter; 30. Pressure regulating valve and mass flow meter; 31. Argon cylinder; 32. Closed-loop pipeline; 33. Gas-liquid separator; 34. Condenser; 35. Exhaust manifold; 36. Intake manifold; 37. Oxygen and argon supply pipes; 38. CO2 capture device DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] See also Figure 1 and Figure 2 , based on a closed argon cycle piston engine airless hybrid propulsion system, including a new horizontally opposed two-stroke internal combustion engine, a hybrid power component and a closed argon cycle component;

[0041] The closed argon circulation component is equipped with a new horizontally opposed two-stroke internal combustion engine, which realizes the closed circulation of argon, can achieve efficient use of fuel and save resources;

[0042] The new horizontally opposed two-stroke internal combustion engine is an Ar closed-cycle hydrogen engine. Controlling moisture in the working fluid in an Ar closed-cycle hydrogen engine is simple: simply controlling the condenser temperature to achieve varying saturated vapor pressures. Water vapor in the working fluid is then used to control knock. Increasing the water vapor partial pressure in an Ar closed-cycle hydrogen engine reduces knock due to the increased average specific heat of the working fluid and lower combustion temperatures, effectively creating exhaust gas recirculation in an air engine.

[0043] The new horizontally opposed two-stroke internal combustion engine is connected to a hybrid power assembly to convert the output of the new horizontally opposed two-stroke internal combustion engine into a driving force to generate electrical energy, thereby realizing the function of hybrid power. At the same time, by effectively controlling the direct current, the system operation is made more stable, saving fuel consumption while also saving electrical energy consumption.

[0044] The novel horizontally opposed two-stroke internal combustion engine comprises a housing, inside which are arranged a piston-cylinder assembly, an output shaft 20 and a crank-connecting rod mechanism;

[0045] The piston-cylinder assembly drives the output shaft 20 to rotate through the crank-connecting rod mechanism;

[0046] The shell is provided with.

[0047] The piston-cylinder assembly includes a first piston 1, a first cylinder 2, a first air intake hole 3, a first air intake passage 4, a second cylinder 5, a second piston 6, a third piston 7, a third cylinder 8, a second air intake passage 9, a second air intake hole 10, a fourth cylinder 11, a fourth piston 12, a first exhaust port 13, a spark plug 14, a first air intake plate 15, a second exhaust port 16, a third exhaust port 17, a second air intake plate 18, and a fourth exhaust port 19;

[0048] A first piston 1 and a second piston 6 are provided in the first cylinder 2 and the second cylinder 5, and the first piston 1 and the second piston 6 reciprocate in the same direction in the first cylinder 2 and the second cylinder 5 respectively. A third piston 7 and a fourth piston 12 are provided in the third cylinder 8 and the fourth cylinder 11, and the third piston 7 and the fourth piston 12 reciprocate in the same direction in the third cylinder 8 and the fourth cylinder 11 respectively. The reciprocating direction of the first piston 1 and the second piston 6 is opposite to that of the third piston 7 and the fourth piston 12;

[0049] A first air intake duct 4 is provided above the second cylinder 5, a first air intake plate 15 is provided below the second cylinder 5, a first air intake hole 3 is provided at the connection between the second piston 6 and the first piston 1, a first exhaust port 13 is provided at the first cylinder 2, and a second exhaust port 16 is provided at the second cylinder 5;

[0050] A second air intake duct 9 is provided above the fourth cylinder 11, a second air intake plate 18 is provided below the fourth cylinder 11, a second air intake hole 10 is provided at the connection between the third piston 7 and the fourth piston 12, a third exhaust port 17 is provided at the third cylinder 8, and a fourth exhaust port 19 is provided at the fourth cylinder 11;

[0051] Spark plugs 14 are provided between the second piston 6 and the first air intake plate 15 and between the third piston 7 and the second air intake plate 18;

[0052] The load of the new horizontally opposed two-stroke internal combustion engine is controlled by the overlap range between the intake duct and the intake port, eliminating the throttle valve and other structures of the traditional internal combustion engine, making the internal combustion engine structure simpler;

[0053] In the internal combustion engine working chamber, when the first piston 1 is at the bottom dead center, the second piston 6 is at the top dead center, and the first intake passage 4 in the combustion chamber is close to the top dead center, and the exhaust valve is close to the bottom dead center. The same applies to the third cylinder 8 and the fourth cylinder 11.

[0054] The crank-connecting rod mechanism includes a first crank 21, a first connecting rod 22, a second crank 23 and a second connecting rod 24;

[0055] The first piston 1 and the second piston 6 are connected by a first connecting rod 22, and the third piston 7 and the fourth piston 12 are connected by a second connecting rod 24. The first connecting rod 22 and the second connecting rod 24 convert the reciprocating motion into the rotation of the output shaft 20 through the first crank 21 and the second crank 23 respectively.

[0056] When the first piston 1 is at the bottom dead center, the second piston 6 is at the top dead center, the first intake passage 4 in the combustion chamber is close to the top dead center, and the exhaust valve is close to the bottom dead center. The same applies to the third cylinder 8 and the fourth cylinder 11.

[0057] The hybrid power package includes the propulsion unit, drive motor, generator, controller, and battery;

[0058] The output shaft 20 is connected to the generator, and the energy generated by combustion is used by the generator to generate electrical energy. At the same time, the controller distributes current to the drive motor and the battery, so that the drive motor drives the propulsion device to operate.

[0059] The closed argon circulation assembly includes a hydrogen supply pipe 26, an exhaust manifold 35, and an intake manifold 36;

[0060] An intake manifold 36 is provided at one end of the hydrogen supply pipe 26, and an exhaust manifold 35 is provided at the other end of the hydrogen supply pipe 26. The intake manifold 36 is connected to the first intake duct 4 and the second intake duct 9, and the exhaust manifold 35 is connected to the first exhaust port 13, the second exhaust port 16, the third exhaust port 17 and the fourth exhaust port 19, thereby forming a closed system.

[0061] The hydrogen supply pipe 26 is provided with a hydrogen cylinder 25, an oxygen cylinder 27, an argon cylinder 31, a closed-circuit pipeline 32, a gas-liquid separator 33, a condenser 34, oxygen and argon supply pipes 37 and a CO2 capture device 38;

[0062] The hydrogen cylinder 25 is connected to the hydrogen supply pipe 26 through a pressure regulating valve 28 and a mass flow meter 29;

[0063] The oxygen cylinder 27 is connected to the oxygen and argon supply pipe 37 through the pressure regulating valve 28 and the mass flow meter 29;

[0064] The pressure regulating valve 28 and the mass flow meter 29 are used to constantly control the flow of hydrogen and oxygen, and suppress detonation by changing the equivalence ratio;

[0065] The argon cylinder 31 is connected to the oxygen and argon supply pipe 37 through a pressure regulating valve and a mass flow meter 30;

[0066] The hydrogen cylinder 25 supplies hydrogen to the new horizontally opposed two-stroke internal combustion engine through the hydrogen supply pipe 26. At the same time, argon is sealed into the entire cycle in advance. The oxygen cylinder 27 and the argon cylinder 31 supply oxygen and argon to the new horizontally opposed two-stroke internal combustion engine through the oxygen and argon supply pipes 37. The oxygen, argon and hydrogen form a mixed gas and enter the intake manifold 36. Then, they enter the new horizontally opposed two-stroke internal combustion engine together for combustion.

[0067] The exhaust gas is discharged through the exhaust manifold 35 and after cooling through the condenser 34, the water in the exhaust gas is separated and the water can be directly discharged outside the system through the gas-liquid separator 33;

[0068] This system is used for the propulsion system of underwater vehicles and operates underwater. Therefore, the exhaust gas after combustion can be discharged directly underwater after the water in the gas is separated by the gas-liquid separator 33 and the condenser 34. No additional water storage device is required, which realizes convenient water discharge. At the same time, the water in the exhaust gas can also participate in the cooling water circulation in the condenser 34, reducing the need for additional cooling water replenishment.

[0069] The separated argon, incompletely burned hydrogen, and incompletely used oxygen are used as circulating gases. After being replenished with new working fluids through the hydrogen cylinder 25, oxygen cylinder 27, and argon cylinder 31, they re-enter the new horizontally opposed two-stroke internal combustion engine for combustion, realizing a closed cycle of argon, enabling effective use of fuel, and greatly saving resources.

[0070] It also includes a gas analyzer, which is used to detect the proportion of gas components in the pipeline, effectively monitor the mixing degree of the mixed gas and the effect of gas-liquid separation, and facilitate timely replenishment of the gas. During the argon closed circulation process, due to the presence of the gas analyzer, continuous sampling will be carried out, thereby consuming part of the working fluid. The argon consumed by sampling in the argon cylinder 31 is used to ensure that the working fluid is sufficient during the closed circulation process.

[0071] The experimental device includes a working fluid circulation pipeline and a test system. Since the gas composition analyzer continuously samples and consumes some of the working fluid, Ar needs to be continuously replenished. In addition, the trace CO2 produced by the combustion of the lubricating oil will gradually accumulate, so the working fluid in the closed-loop pipeline needs to be replaced at a certain flow rate. The sampling flow rate of the gas composition analyzer is 4L / min, and the flow rate of CO2 replacing Ar is about 4L / min, so 8L / min of Ar needs to be continuously replenished to the pipeline. In order to discharge the replaced Ar, an overflow port open to the outside world is set in the closed-loop pipeline of the propulsion system.

[0072] The argon closed cycle has unique advantages in thermal efficiency. To test the thermal efficiency improvement effect of the argon closed cycle, the effective thermal efficiency was tested during gasoline operation with a compression ratio of 8.7, an ignition timing of 23°CA BTDC, and a speed of 3000r / min. After the argon closed cycle modification, the compression ratio was reduced to 5.75, the ignition timing was 10.5°CA BTDC, and the operation was changed from air to argon and hydrogen. At an effective power of 425W, the effective thermal efficiency increased by 41.7%.

[0073] During the closed-cycle process, unburned hydrogen and oxygen continue to accumulate, reaching very high concentrations. By varying the equivalence ratio, the experimental range was set within 0.09 to 7.96 (oxygen concentrations of 60.9% to 5.7%), with a compression ratio of 5.75, a speed of 3000 rpm, and an ignition timing of 14°. Maximum knock occurred at an equivalence ratio of 1.23, an effective thermal power of 432 W, an Ar concentration of 76.81%, and a high in-cylinder pressure of 2.70 MPa. Minimum knock occurred, achieving the best knock suppression effect, at an equivalence ratio of 0.30, an effective thermal power of 354 W, a maximum in-cylinder pressure of 1.97 MPa, and an Ar concentration of 66.65%. This experimental condition resulted in excess oxygen at maximum in-cylinder pressure. Through the above experiments, it was found that under the condition of excess oxygen at the maximum in-cylinder pressure, maintaining a higher Ar concentration can effectively suppress knock, and the thermal efficiency is less reduced. Therefore, it can be determined that under the condition of fixed ignition period, excess oxygen is an effective method for knock suppression.

[0074] Using water vapor in the working fluid to control knock. Increasing the water vapor partial pressure in the working fluid of an Ar closed-cycle hydrogen engine reduces knock due to the increase in the working fluid's average specific heat and a decrease in combustion temperature, effectively mitigating knock. This is equivalent to exhaust gas recirculation in an air engine. Controlling the water content in the working fluid in an Ar closed-cycle hydrogen engine is simple: simply control the condenser temperature to achieve different saturated vapor pressures. The experiment first maintained the circulating Ar temperature at 25°C and gradually increased the hydrogen supply. When knock was detected based on noise, the hydrogen supply at 25°C was determined to be the knock-initiating hydrogen supply. This hydrogen supply was then maintained at other temperatures. In this experiment, any cycle in which the knock intensity exceeded 25 kPa was considered to have experienced knock, and the knock rate was defined as the ratio of cycles in which knock occurred to 100 cycles. When the circulating Ar water vapor partial pressure was 3.0 Pa, knock occurred in approximately half (49) of the cycles. This number decreased to 4 at a circulating Ar water vapor partial pressure of 15.2 kPa and to 1 at 30 kPa. This shows that increasing the water vapor partial pressure will significantly reduce the knock effect.

[0075] Under closed-cycle conditions, since the exhaust pipe is connected to the intake manifold, exhaust pressure may affect intake pressure, causing fluctuations in intake pressure and, in turn, affecting the occurrence of knock. After compression top dead center (ATDC), in the first half of the exhaust stroke, in-cylinder pressure in both the closed and open cycles increases, reaching a peak around 300° ATDC before declining. This increase and decrease are caused by the positive pressure generated by piston thrust in the first half of the exhaust stroke and the negative pressure generated by exhaust inertia in the second half. Between 200° and 300° ATDC, in-cylinder pressure in the open cycle is slightly higher than that in the closed cycle. After 300° ATDC, in-cylinder pressure in the closed cycle gradually exceeds that in the open cycle. This is because exhaust gases in the closed cycle are trapped in the exhaust pipe, while those in the open cycle are discharged directly into the atmosphere. In the second half of the intake stroke, starting at 450° ATDC, as the piston's downward velocity decreases, the inertia of the intake air becomes apparent, causing the closed-cycle and open-cycle in-cylinder pressures to reverse, with the open-cycle pressure being higher than the closed-cycle pressure. This is due to a reversal in the intake manifold pressures between the closed and open cycles. The reason for this reversal is that in the closed-cycle, since the closed-cycle piping volume remains constant, the intake manifold pressure decreases proportionally to the amount of intake air flowing into the cylinder. In the open-cycle, however, since the closed-cycle piping is connected to the atmosphere, the intake manifold pressure does not decrease. Therefore, it can be assumed that the intake air volume in the closed-cycle is less than that in the open-cycle in the second half of the intake stroke. From the above analysis, it can be seen that the closed-cycle intake volume is greater in the first half of the intake stroke and less in the second half, while the reverse is true for the open-cycle. Therefore, it can be assumed that the overall intake volume is essentially the same for the closed and open cycles. Therefore, at the end of the intake stroke, the in-cylinder pressures in the closed and open cycles remain essentially unchanged. From the above analysis, it can be seen that although the exhaust pressure in the closed-circuit pipeline affects the intake pressure in the closed-circuit pipeline, it does not affect the in-cylinder pressure of the final intake stroke, so it can be considered that it has no effect on knock.

[0076] This invention proposes an airless hybrid propulsion system based on a closed argon cycle free-piston engine. This system utilizes a novel horizontally opposed two-stroke internal combustion engine structure. Within the engine's combustion chamber, a combustible mixture of hydrogen fueled by argon and oxygen is generated. The engine is connected to a generator, and a controller distributes current to the drive motor and battery, reducing fuel consumption. This device is primarily used in underwater vehicle propulsion systems. During engine operation, hydrogen, oxygen, and argon combust to produce water and argon. This combustion process produces no pollutants, and the generated water can be quickly and efficiently discharged underwater. The generated argon can also be recycled and reused in the hydrogen combustion process.

[0077] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. Airless hybrid propulsion system based on closed argon cycle piston engine, characterized by: Includes a new horizontally opposed two-stroke internal combustion engine, hybrid power components and closed argon cycle components; The closed argon circulation assembly is equipped with a new horizontally opposed two-stroke internal combustion engine, which realizes the closed circulation of argon, can achieve efficient use of fuel and save resources; The new horizontally opposed two-stroke internal combustion engine is connected to a hybrid power component, which is used to convert the output of the new horizontally opposed two-stroke internal combustion engine into a driving force to generate electrical energy, thereby realizing the function of hybrid power. At the same time, by effectively controlling direct current, the system operation is made more stable, saving fuel consumption while also saving electrical energy consumption.

2. The airless hybrid propulsion system based on a closed argon cycle piston engine according to claim 1 is characterized in that: The novel horizontally opposed two-stroke internal combustion engine comprises a housing, the inner side of which is provided with a piston-cylinder assembly, an output shaft (20) and a crank-connecting rod mechanism; The piston-cylinder assembly drives the output shaft (20) to rotate through a crank-connecting rod mechanism; The housing is provided with.

3. The airless hybrid propulsion system based on a closed argon cycle piston engine according to claim 2, characterized in that: The piston-cylinder assembly comprises a first piston (1), a first cylinder (2), a first air intake hole (3), a first air intake passage (4), a second cylinder (5), a second piston (6), a third piston (7), a third cylinder (8), a second air intake passage (9), a second air intake hole (10), a fourth cylinder (11), a fourth piston (12), a first exhaust port (13), a spark plug (14), a first air intake plate (15), a second exhaust port (16), a third exhaust port (17), a second air intake plate (18) and a fourth exhaust port (19); A first piston (1) and a second piston (6) are provided in the first cylinder (2) and the second cylinder (5), and the first piston (1) and the second piston (6) respectively perform reciprocating motion in the same direction in the first cylinder (2) and the second cylinder (5); a third piston (7) and a fourth piston (12) are provided in the third cylinder (8) and the fourth cylinder (11), and the third piston (7) and the fourth piston (12) respectively perform reciprocating motion in the same direction in the third cylinder (8) and the fourth cylinder (11); the reciprocating motion directions of the first piston (1) and the second piston (6) are opposite to those of the third piston (7) and the fourth piston (12); A first air inlet (4) is provided above the second cylinder (5), a first air inlet plate (15) is provided below the second cylinder (5), a first air inlet hole (3) is provided at the connection between the second piston (6) and the first piston (1), a first exhaust port (13) is provided at the first cylinder (2), and a second exhaust port (16) is provided at the second cylinder (5); A second air intake passage (9) is provided above the fourth cylinder (11), a second air intake plate (18) is provided below the fourth cylinder (11), a second air intake hole (10) is provided at the connection between the third piston (7) and the fourth piston (12), a third exhaust port (17) is provided at the third cylinder (8), and a fourth exhaust port (19) is provided at the fourth cylinder (11); Spark plugs (14) are provided between the second piston (6) and the first air intake plate (15) and between the third piston (7) and the second air intake plate (18).

4. The airless hybrid propulsion system based on a closed argon cycle piston engine according to claim 2, characterized in that: The crank-connecting rod mechanism comprises a first crank (21), a first connecting rod (22), a second crank (23) and a second connecting rod (24); The first piston (1) and the second piston (6) are connected by a first connecting rod (22), and the third piston (7) and the fourth piston (12) are connected by a second connecting rod (24). The first connecting rod (22) and the second connecting rod (24) convert reciprocating motion into rotation of the output shaft (20) through a first crank (21) and a second crank (23) respectively. When the first piston (1) is at the bottom dead center, the second piston (6) is at the top dead center, the first intake passage (4) in the combustion chamber is close to the top dead center, and the exhaust valve is close to the bottom dead center. The same applies to the third cylinder (8) and the fourth cylinder (11).

5. The airless hybrid propulsion system based on a closed argon cycle piston engine according to claim 2, characterized in that: The hybrid power assembly includes a propulsion device, a drive motor, a generator, a controller and a battery; The output shaft (20) is connected to a generator, and the energy generated by combustion is used by the generator to generate electrical energy. At the same time, the controller distributes current to the drive motor and the battery, thereby enabling the drive motor to drive the propulsion device to operate.

6. The airless hybrid propulsion system based on a closed argon cycle piston engine according to claim 3, characterized in that: The closed argon circulation assembly includes a hydrogen supply pipe (26), an exhaust manifold (35) and an intake manifold (36); An intake manifold (36) is provided at one end of the hydrogen supply pipe (26), and an exhaust manifold (35) is provided at the other end of the hydrogen supply pipe (26). The intake manifold (36) is connected to the first intake duct (4) and the second intake duct (9), and the exhaust manifold (35) is connected to the first exhaust port (13), the second exhaust port (16), the third exhaust port (17) and the fourth exhaust port (19), thereby forming a closed system.

7. The airless hybrid propulsion system based on a closed argon cycle piston engine according to claim 6, characterized in that: The hydrogen supply pipe (26) is provided with a hydrogen cylinder (25), an oxygen cylinder (27), an argon cylinder (31), a closed circulation pipeline (32), a gas-liquid separator (33), a condenser (34), oxygen and argon supply pipes (37) and a CO2 capture device (38); The hydrogen cylinder (25) is connected to the hydrogen supply pipe (26) via a pressure regulating valve (28) and a mass flow meter (29); The oxygen cylinder (27) is connected to the oxygen and argon supply pipe (37) through a pressure regulating valve (28) and a mass flow meter (29); The pressure regulating valve (28) and the mass flow meter (29) are used to constantly control the flow of hydrogen and oxygen, and suppress detonation by changing the equivalence ratio; The argon gas cylinder (31) is connected to the oxygen and argon gas supply pipe (37) via a pressure regulating valve and a mass flow meter (30); The hydrogen cylinder (25) supplies hydrogen to the new horizontally opposed two-stroke internal combustion engine through the hydrogen supply pipe (26). At the same time, argon is sealed in advance for the entire cycle. The oxygen cylinder (27) and the argon cylinder (31) supply oxygen and argon to the new horizontally opposed two-stroke internal combustion engine through the oxygen and argon supply pipes (37). The oxygen, argon and hydrogen form a mixed gas and enter the intake manifold (36). Then, they enter the new horizontally opposed two-stroke internal combustion engine together for combustion. The exhaust gas is discharged through the exhaust manifold (35), and after cooling through the condenser (34), the water in the exhaust gas is separated and the water can be directly discharged outside the system through the gas-liquid separator (33); The separated argon, incompletely burned hydrogen and incompletely used oxygen are used as circulating gas, and after being replenished with new working fluids from the hydrogen cylinder (25), oxygen cylinder (27) and argon cylinder (31), they are again entered into the new horizontally opposed two-stroke internal combustion engine for combustion, thereby realizing a closed cycle of argon and enabling efficient use of fuel.

8. The airless hybrid propulsion system based on a closed argon cycle piston engine according to claim 7, characterized in that: The apparatus also includes a gas analyzer, which is used to detect the ratio of gas components in the pipeline, effectively monitor the mixing degree of the mixed gas and the effect of gas-liquid separation, and facilitate timely replenishment of the gas. During the argon closed circulation process, due to the presence of the gas analyzer, continuous sampling will be performed, thereby consuming part of the working fluid. The argon consumed by the argon cylinder (31) due to sampling is used to ensure that the working fluid is sufficient during the closed circulation process.

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