Liquid nitrogen engine

Abstract

We provide liquid nitrogen engines with higher efficiency and longer lifespan. [Solution] The present invention relates to a liquid nitrogen engine comprising a cylindrical cylinder body 10 having a ring groove 104, a shaft hole 103, an explosion chamber 100, a nitrogen gas chamber 101 and a spark plug 102, and a cylindrical flywheel 11 pivotally attached to the cylinder body 10 and located on one side of the cylinder body 10 that does not have the ring groove 104, and having a ring-shaped recess 111, a rotating shaft 110, an internal guide hole 112 and an external guide rail 113. Because the present invention uses liquid nitrogen, it has a very low carbon dioxide emission problem, and because nitrogen gas is non-flammable, it can be stored as a safe fuel for carriers (vehicles or aircraft). The present invention can operate at lower controlled temperatures (below 100°C), thus having higher efficiency and a longer lifespan.

Description

Technical Field

[0001] The present invention relates to a liquid nitrogen engine, and particularly to a liquid nitrogen engine with low cost, high efficiency, simple structure and environmental friendliness. Background Literature

[0002] Since the invention of the internal combustion engine in the 18th century, many aspects of human life have changed. The internal combustion engine has evolved over a long period, and what it was in the 18th century is far from what it is now.

[0003] The types of internal combustion engines can be divided into two categories: cyclic combustion and continuous combustion. Cyclic combustion includes reciprocating piston internal combustion engines and rotary engines, and continuous combustion includes gas turbine engines and jet engines.

[0004] Reciprocating piston internal combustion engines are widely used in automotive vehicles such as automobiles and motorcycles, and can use fuels such as gasoline, diesel, renewable fuel, biomass diesel, fossil fuel or natural gas. In the flow of intake, compression, explosion, and exhaust between each cylinder, the piston located inside the cylinder is propelled, and kinetic energy is generated by the reciprocating motion. When used in an automobile, this kinetic energy drives the tires of the automobile. Reciprocating piston internal combustion engines adopt designs such as cylinders, crankshafts, and pistons. However, in such designs, fuel is released into the atmosphere without complete combustion, resulting in air and environmental pollution. Therefore, reciprocating piston internal combustion engines are one of the main causes of urban air pollution.

[0005] A rotor engine is an eccentric mechanism driven by a rotor piston instead of a crankshaft. Rotor engines are currently used in aircraft and automobiles, but in small numbers. As the rotor rotates, its three vertices form three separate combustion chambers along the cylinder wall, and the eccentric mechanism constantly changes the volume of each combustion chamber. This is similar to the effect of the up-and-down motion of a piston in a reciprocating piston internal combustion engine. With each rotation of the rotor, each combustion chamber can complete one combustion cycle. Because the operating principle of a rotor engine is similar to that of a reciprocating piston internal combustion engine, all the drawbacks of a reciprocating piston internal combustion engine also apply to a rotor engine.

[0006] Gas turbine engines, which are continuous combustion internal combustion engines, are widely used in ships. Each state of their circulation occurs within spatially separated components connected to each other through flow guides, and processes such as fuel supply, combustion, and exchange are continuous. However, because gas turbine engines are internal combustion engines that use fossil fuels, they also have the drawback of incomplete fuel combustion, and when this incompletely burned fuel is released into the atmosphere, it causes a considerable amount of air and environmental pollution.

[0007] Jet engines are widely used in aircraft, and their combustion process is continuous, generating thrust by expelling a high-pressure airflow created by combustion. The exhaust gases emitted from jet engines create contrails and airborne particles in the upper atmosphere, and some scientists believe that contrails and airborne particles are one of the factors contributing to current climate change.

[0008] Although internal combustion engines have advanced rapidly over more than 200 years of development, their shortcomings, such as air pollution and environmental pollution caused by incomplete combustion, and low utilization rates of combustion efficiency, have become targets of criticism as environmental awareness grows.

[0009] In summary, conventional internal combustion engines have problems such as being unenvironmentally unfriendly and inefficient. Therefore, the current industry urgently needs to consider how to provide environmentally friendly and highly efficient internal combustion engines with new ideas for improvement and innovation. [Overview of the project]

[0010] In light of the shortcomings of the aforementioned prior art, we urgently considered improvements and innovations, and after many years of research and experimentation, we finally succeeded in the research and development of the liquid nitrogen engine according to the present invention.

[0011] The present invention relates to a liquid nitrogen engine comprising a cylinder body and a flywheel, wherein the cylinder body is cylindrical and has a ring groove located on one side of the cylinder body, a shaft hole located in the center of the cylinder body, multiple explosion chambers provided inside the cylinder body and surrounded by the periphery of the cylinder body and adjacent to the ring groove, a plurality of nitrogen gas chambers provided inside the cylinder body and adjacent to the ring groove, adjacent to each other from the explosion chambers and spaced apart on the periphery of the cylinder body, and a plurality of spark plugs provided in each explosion chamber, and the flywheel is cylindrical and has a cylinder The present invention provides a liquid nitrogen engine comprising: a ring-shaped groove pivotally attached to a davit and located on one side of the cylinder body that does not have a ring groove, provided at one end of the flywheel and facing the nitrogen gas chamber and the explosion chamber; a rotating shaft located on one side of the flywheel and drilled in the shaft hole, with an axial bearing, gasket and locking member provided at the end of the rotating shaft protruding from the shaft hole; a plurality of internal guide holes provided inside the flywheel and inclined at a specific angle by the ring-shaped groove and penetrating the flywheel; and a plurality of external guide rails provided on the outer surface of the flywheel and parallel to the internal guide holes.

[0012] In one embodiment, the liquid nitrogen engine further includes a cover that is a hollow cylindrical body with openings at both ends, connected to the cylinder body and covered outside the flywheel.

[0013] In one embodiment, each explosion chamber has a gas inlet, an exhaust gas outlet facing the link-shaped groove, an ignition port for installing the spark plug, an intake valve provided at the gas inlet, and an exhaust valve provided at the exhaust gas outlet.

[0014] In one embodiment, each nitrogen gas chamber has an intake port, an exhaust port facing a ring-shaped groove, and a nozzle provided in the intake port.

[0015] In one embodiment, the specific angle is between 30 and 60 degrees.

[0016] In one embodiment, there are bearings at both ends of the shaft hole, and the rotating shaft passes through the bearings and the shaft hole so as to pivotally attach the flywheel to the cylinder body.

[0017] In one embodiment, the other side of the flywheel further has a rotation axis.

[0018] As described above, because the present invention uses liquid nitrogen, it can operate under controlled conditions at relatively low temperatures (below 100°C). Furthermore, the present invention does not require the use of a piston and crankshaft, nor does it require the use of lubricating oil, thus eliminating the need for an oil reservoir (or oil sump). Consequently, the mechanical design of the present invention is simple and has a low coefficient of friction, resulting in fewer problems, lower operating temperatures, higher efficiency, and a longer lifespan.

[0019] The advantages of using liquid nitrogen include significantly reduced carbon dioxide emissions, and in terms of safety, nitrogen gas is non-flammable, making it a safe fuel to store for carriers (vehicles and aircraft). Because liquid nitrogen is stored at low temperatures, it does not require expensive high-pressure tanks and only requires thermal protection, making it convenient as it can utilize existing refueling infrastructure and convert gas stations.

[0020] The present invention can lower the temperature of a liquid nitrogen engine by absorbing heat when liquid nitrogen evaporates, that is, when it is converted from a liquid to a gas, so the present invention does not require the design of a heat dissipation mechanism such as a fan, a pump of a tank, or a tank.

[0021] Since the dimensions of the liquid nitrogen engine according to the present invention can be changed according to requirements, the dimensions can be large or small. According to actual requirements, the diameter of each explosion chamber and each nitrogen gas chamber can also be limited to about 2 cm or less. Also, if the number of cylinder bodies is acceptable, the number of each explosion chamber and each nitrogen gas chamber can be changed according to actual requirements.

Brief Description of the Drawings

[0022] [Figure 1] It is a perspective exploded view of the liquid nitrogen engine according to the present invention. [Figure 2] It is a schematic cross-sectional view of the liquid nitrogen engine according to the present invention. [Figure 3] It is a perspective external view of the cylinder body according to the present invention. [Figure 4] It is a schematic diagram of a fuel supply system. [Figure 5] It is a perspective external view of the flywheel according to the present invention. [Figure 6] It is a schematic partial cross-sectional view of the flywheel according to the present invention.

Embodiments for Carrying Out the Invention

[0023] Refer to FIGS. 1 and 2. FIG. 1 is a perspective exploded view of the liquid nitrogen engine according to the present invention. FIG. 2 is a schematic cross-sectional view of the liquid nitrogen engine according to the present invention. As shown in FIGS. 1 and 2, the liquid nitrogen engine according to the present invention includes a cylinder body 10, a flywheel 11, and a cover 12.

[0024] Figure 3 is a perspective external view of the cylinder body according to the present invention. As shown in Figure 3, the cylinder body 10 is cylindrical and has a plurality of explosion chambers 100, a plurality of nitrogen gas chambers 101, and a plurality of spark plugs 102. The explosion chambers 100 are provided inside the cylinder body 10 and are located at the periphery of the cylinder body 10. The nitrogen gas chambers 101 are provided inside the cylinder body 10, and the explosion chambers 100 and the nitrogen gas chambers 101 are adjacent to each other and are installed at intervals at the periphery of the cylinder body 10.

[0025] The explosion chamber 100 includes a gas inlet 1000, an exhaust gas outlet 1001, an ignition port 1002 provided with a spark plug 102, an intake valve 1003 which is a one-way valve provided at the gas inlet 1000, and an exhaust valve 1004 which is a pressure valve provided at the exhaust gas outlet 1001. In one embodiment, the gas inlet 1000 is coupled to a fuel supply system (not shown) that supplies fuel such as gasoline, ethanol, gas (liquefied petroleum gas), alcohol, and combustible gas (hydrogen) to the explosion chamber 100.

[0026] The figure is a schematic diagram of the fuel supply system. As shown in Figure 4, the fuel supply system includes a blower 20 coupled to a venturi tube 21, a venturi tube 21 coupled to the gas inlet 1000 and the fuel tank 22 respectively, and the fuel tank 22. The venturi tube 21 and the fuel tank 22 are designed as a conventional carburetor.

[0027] The nitrogen gas chamber 101 has an intake port 1010, an exhaust port 1011, and a nozzle 1012 provided at the intake port 1010 and coupled to a liquid nitrogen supply system. The design of the liquid nitrogen supply system may be similar to that of the fuel supply system, or the liquid nitrogen supply system may be in the form of a combination of a supercharger and a liquid nitrogen tank.

[0028] To further describe the liquid nitrogen supply system, the present invention generates high pressure (minimum 150 psi) and pumps liquid nitrogen using a small-volume gear pump. Because the liquid nitrogen engine uses a small amount of liquid nitrogen in any given time, a small-diameter pipeline (e.g., a 1-weight pipe) is required to connect the gear pump and the cylinder body 10, but backflow is unnecessary because the gear pump has a function to shut off reverse pressure.

[0029] The cylinder body 10 is further provided with a shaft hole 103 in the center, each having a bearing 1030 at both ends.

[0030] One side of the cylinder body 10 is further provided with a ring groove 104, for the purpose of reducing the weight and volume of the cylinder body 10 so that the cylinder body 10 can be heated more easily. The ring groove 104 is adjacent to the explosion chamber 100 and the nitrogen gas chamber 101.

[0031] Refer to Figures 5 and 6. Figure 5 is a perspective view of the flywheel according to the present invention. Figure 6 is a schematic partial cross-sectional view of the flywheel according to the present invention. As shown in Figures 5 and 6, the flywheel 11 is cylindrical and comprises at least one rotating shaft 110, one ring-shaped groove 111, a plurality of internal guide holes 112, and a plurality of external guide rails 113. The rotating shaft 110 passes through a bearing 1030 and a shaft hole 103 so as to pivotally attach the flywheel 11 to the cylinder body 10. The rotating shaft 110 has an axial bearing 114 at its protruding end from the shaft hole 103, and this end further has a screw thread 116 and a locking member 115. The protruding end of the rotating shaft 110 passes through the axial bearing 114, and the locking member 115 engages with the screw thread 116 so as to pivotally attach the flywheel 11 to the cylinder body 10. Gaskets 117, which are consumables made of cemented carbide, are provided on both sides of the axial bearing 114. For the axial bearings 114 and 1030, in order to support the rotating shaft 110 while maintaining its central position, a ring-shaped groove 111 is provided at one end of the flywheel 11, facing the exhaust gas outlet 1001 and exhaust port 1011 of the cylinder body 10. An inner guide hole 112 is provided inside the flywheel 11, and penetrates the flywheel 11 at a specific angle by the ring-shaped groove 111. An outer guide rail 113 is provided on the outer surface of the flywheel 11 and runs parallel to the inner guide hole 112, or the outer guide rail 113 is inclined at the aforementioned specific angle from one end to the other of the flywheel 11. The specific angle is between 30 and 60 degrees, preferably 45 degrees.

[0032] In one embodiment, one side of the flywheel 11 has a rotating shaft 110, which can be linked to a reduction gearbox to further output power from the liquid nitrogen engine according to the present invention. In another embodiment, both sides of the flywheel 11 each have a rotating shaft 110, which can be linked to a reduction gearbox to increase the output power.

[0033] The cover 12 is a hollow cylindrical body that is mounted on the outside of the flywheel 11 and has openings at both ends. The cover 12 improves engine efficiency and provides protection for the flywheel 11.

[0034] The blower 20 delivers supercharged air to the venturi tube 21. As the supercharged air passes through a region where it is constricted by the diameter of the venturi tube 21, its velocity increases due to the constriction of the venturi tube 21's diameter, generating a vacuum suction force. This vacuum suction force draws fuel out of the fuel tank 22, mixes it with the air to form an oil-gas mixture, which enters the explosion chamber 100 through the gas inlet 1000. This mixture is mixed in a specific ratio, a preferred ratio being 1 (fuel):14.5 (air). Since the intake valve 1003 is a one-way valve, the oil-gas mixture does not flow back from the explosion chamber 100 into the venturi 21.

[0035] The spark plug 102 ignites the oil-gas mixture in the explosion chamber 100, causing the mixture to explode and creating a high-temperature, high-pressure environment that heats the cylinder body 10. The exhaust valve 1004 is a pressure valve, and the high pressure pushes out the exhaust valve 1004, opening the exhaust gas outlet 1001, and the exhaust gas is discharged through the exhaust gas outlet 1001 into the link-shaped groove 111.

[0036] The exhaust gas enters the inner guide hole 112 through the ring-shaped groove 111 and flows along the angle of the inner guide hole 112. This pushes the flywheel 11, and the exhaust gas is dissipated to the outside through the gap between the flywheel 11 and the cylinder body 10, but the cover 12 prevents the dissipated exhaust gas from flowing to the outside. The push on the flywheel 11 is strengthened by pushing the dissipated exhaust gas against the outer guide rail 113 so that it flows along the inclination angle of the outer guide rail.

[0037] Once the exhaust gas is discharged from the explosion chamber 100, the pressure in the explosion chamber 100 returns to normal, and the exhaust valve 1004 closes the exhaust gas outlet 1001. The intake, explosion, and exhaust operations described above are then repeated in the explosion chamber 100.

[0038] A temperature sensor (not shown) located inside the cylinder body 10 detects the temperature of the cylinder body 10. When the temperature of the cylinder body 10 is heated to a temperature sufficient for the conversion of nitrogen from liquid to gas, the liquid nitrogen supply system supplies liquid nitrogen to the nitrogen gas chamber 101, and the liquid nitrogen enters the nitrogen gas chamber 101 through the nozzle 1012. As a result, the liquid nitrogen is affected by the high temperature and converts from liquid to gas, and the nitrogen gas is discharged from the nitrogen gas chamber 101 through the exhaust port 1011. Since nitrogen, upon conversion from liquid to gas, possesses a considerable amount of pressure, the high-pressure nitrogen gas enters the inner guide hole 112 through the ring-shaped groove 111 and flows along the inclination angle of the inner guide hole 112, pushing the flywheel 11.

[0039] As described above, the temperature sensor may be configured to control the gear pump. Therefore, when the temperature of the cylinder body 10 rises above a set value, liquid nitrogen is pumped into the cylinder body 10.

[0040] When nitrogen gas dissipates to the outside through the gap between the flywheel 11 and the cylinder body 10, the cover 12 prevents the nitrogen gas from flowing out, pushing the nitrogen gas against the external guide rail 113 and causing it to flow along the inclination angle of the external guide rail, thereby strengthening the pressure on the flywheel 11.

[0041] In the extremely hot nitrogen gas chamber 101, when the aforementioned liquid nitrogen enters, it undergoes a continuous process of conversion from liquid to gaseous state and subsequent exhaust.

[0042] The gearbox / reduction gearbox is driven by the high-speed rotating flywheel 11. In one embodiment, when the present invention is applied to an automobile, the rotating shaft 110 can be linked with the reduction gearbox (or turbine box) to reduce the rotational speed. In another embodiment, when the present invention is applied to an aircraft, there is no need to use a reduction gearbox because the aircraft engine rotates at high speeds.

[0043] The reduction gearbox or high-speed turbine described above can be connected to a speed sensor (magnet or optical deflector) to monitor the liquid nitrogen engine of the present invention.

[0044] The liquid nitrogen engine of the present invention comprises a cylinder body 10 pivotally connected to a flywheel 11, a flywheel 11, and a cover 12 connected to the cylinder body 10 and covering the outside of the flywheel 11. Gas flows through a pipeline to push open the intake valve 1003, entering the explosion chamber 100 of the cylinder body 10 from the gas inlet 1000. The gas in the explosion chamber 100 is ignited by a spark plug 102, and the explosion pushes out the exhaust valve 1004, which is then discharged from the exhaust gas outlet 1001. The exhaust gas enters the inner guide hole 112 through a ring-shaped groove 111 and flows along the angle of the inner guide hole 112, pushing the flywheel 11. As the exhaust gas dissipates to the outside through the gap between the flywheel 11 and the cylinder body 10, the cover 12 pushes the dissipated exhaust gas, which flows along the inclination angle of the flywheel 11, into the outer guide rail 113, thereby reinforcing the push on the flywheel 11. Once the exhaust gas is discharged from the explosion chamber 100, the pressure in the explosion chamber 100 returns to normal, and the exhaust valve 1004 closes the exhaust gas outlet 1001. The gas explosion is used to heat the cylinder body 10.

[0045] All or both ends of the cylinder body 10 must be ignited simultaneously to prevent unbalanced vibrations of the flywheel 11 in the symmetrical explosion chamber 100. All nozzles 1012 are connected via pipelines, and the ignition frequency to the spark plugs 102 determines the rotational speed of the flywheel 11.

[0046] The temperature sensor detects the temperature of the cylinder body 10, and if the temperature of the cylinder body 10 is not sufficient to change the nitrogen from liquid to gas, the cylinder body 10 is continued to be heated until the temperature of the cylinder body 10 is sufficient to change the nitrogen from liquid to gas.

[0047] When the temperature sensor detects that the temperature of the cylinder body 10 is sufficient to change nitrogen from liquid to gas, the liquid nitrogen supply system supplies liquid nitrogen to the nitrogen gas chamber 101, which enters the nitrogen gas chamber 101 via the nozzle 1012. The liquid nitrogen is affected by the high temperature and changes from liquid to gas, becoming nitrogen gas which is then discharged from the nitrogen gas chamber 101 via the exhaust port 1011. Once nitrogen changes from liquid to gas, the nitrogen gas itself has considerable pressure, so it enters the inner guide hole 112 via the ring-shaped groove 111 and flows along the inclination angle of the inner guide hole 112, pushing the flywheel 11. When the nitrogen gas dissipates to the outside through the gap between the flywheel 11 and the cylinder body 10, the cover 12 prevents the nitrogen gas from flowing out, pushing the nitrogen gas onto the outer guide rail 113 and increasing the pressure on the flywheel 11 by causing the nitrogen gas to flow along the inclination angle of the outer guide rail.

[0048] The liquid nitrogen engine of the present invention has a cylindrical flywheel 11 and a cylindrical cylinder 10 pivotally connected to each other, and converts nitrogen from liquid to gas by increasing the temperature of the cylinder body 10. Since the flywheel 11 can be pushed by either the nitrogen gas or the exhaust gas, the gearbox / reduction gearbox is moved by the rotating flywheel 11. This type of gearbox / reduction gearbox can be used in automobiles, aircraft, etc. In one embodiment, a rotating shaft 110 may be provided on both sides of the flywheel 11, allowing the flywheel 11 to be pivotally connected to the cylinder body 10, and the other rotating shaft 110 to be linked to the gearbox / reduction gearbox or other transmission device. In one embodiment, a rotating shaft 110 is provided on only one side of the flywheel 11, which can pivotally connect the flywheel 11 to the cylinder body 10 and further link the gearbox / reduction gearbox or other transmission device. As mentioned above, the liquid nitrogen engine of the present invention can be designed in various ways according to actual demand, and the dimensions of the liquid nitrogen engine of the present invention can also be increased or decreased according to demand. The diameter and number of each explosion chamber 100 and each nitrogen gas chamber 101 can also be increased or decreased according to actual demand.

[0049] The internal guide hole 112 or the external guide rail 113 is inclined at a specific angle, between 30 and 60 degrees, designed to allow the flywheel 11 to be pushed by exhaust gas or nitrogen gas with maximum efficiency.

[0050] Since nitrogen absorbs a large amount of heat when it changes from liquid to gas, the heat in the cylinder body 10 is absorbed during the nitrogen's transformation, and therefore, the present invention does not require the use of cooling equipment such as a fan, a tank pump, or a tank.

[0051] As described above, the liquid nitrogen engine according to the present invention can be made to function similarly to some internal combustion engines by using a wide variety of fuels such as gasoline, ethanol, liquefied petroleum gas, alcohol, and hydrogen. The cylinder body 10 is heated with the fuel, and when the cylinder body 10 reaches a certain temperature, liquid nitrogen enters the nitrogen gas chamber 101 at an appropriate time.

[0052] Furthermore, by adjusting the locking member 115, the gap between the flywheel 11 and the cylinder body 10 can be reduced to less than 1 mm, resulting in extremely low mechanical friction. Even dissipated gases (nitrogen gas or exhaust gas) are recaptured by the cover 12.

[0053] Because this invention can operate at lower, controlled temperatures (below 100°C), it has higher efficiency and a longer lifespan, and its mechanical design is simple and less prone to problems. Since this invention does not use a piston or crankshaft, there is no need for lubricating oil, and there is no oil reservoir (or oil sump) configuration.

[0054] The manufacturing cost of the present invention is low, and the dimensions of the present invention can be made larger or smaller according to demand. The diameter of each explosion chamber 100 and each nitrogen gas chamber 101 may be limited to about 2 centimeters or less, and the number of explosion chambers 100 and each nitrogen gas chamber 101 may be as many as the cylinder body 10 can accommodate.

[0055] In this invention, because liquid nitrogen is used, carbon dioxide emissions are very low, and since nitrogen gas is non-flammable, it can be stored as a safe fuel for carriers (vehicles and aircraft). Liquid nitrogen is convenient because it does not require expensive high-pressure tanks, and with thermal protection, it can be used to convert gas stations using existing refueling infrastructure. Liquid nitrogen is a byproduct of the oxygen production industry, and since one unit of oxygen obtained from air contains four units of nitrogen gas, nitrogen gas is a low-cost fuel commodity.

[0056] This invention enables a liquid nitrogen engine to automatically adjust the supply of liquid nitrogen and internal combustion fuel once it reaches a certain temperature, in order to achieve better fuel economy.

[0057] In this invention, liquid nitrogen absorbs heat during evaporation, thereby lowering the temperature of the liquid nitrogen engine. Therefore, the ignition system of this invention does not require a fan, a tank pump, or a tank. The ignition frequency can be varied to change the horsepower output. [Explanation of symbols]

[0058] 10 Cylinder Body 100 Explosion Chamber 1000 Gas Inlet 1001 Exhaust gas outlet 1002 Ignition nozzle 1003 Intake valve 1004 Exhaust valve 101 Nitrogen Gas Chamber 1010 Air intake 1011 Exhaust vent 1012 Nozzle 102 Spark plugs 103 Shaft hole 1030 bearing 104 Ring groove 11 Flywheel 110 Rotary shaft 111 Ring-shaped groove 112 Internal guide hole 113 External guide rail 114 Axial bearing 115 Locking member 116 threads 117 Gasket 12 Covers 20 blowers 21 Venturi tube 22 Fuel Tank

Claims

1. It is a liquid nitrogen engine, A cylindrical body, A ring groove located on one side of the cylinder body, The axial hole located in the center of the cylinder body, A plurality of explosion chambers are provided inside the cylinder body, surrounded by the periphery of the cylinder body, and adjacent to the ring groove, A plurality of nitrogen gas chambers are provided inside the cylinder body and adjacent to the ring groove, and the nitrogen gas chamber and the explosion chamber are adjacent to each other and spaced apart on the periphery of the cylinder body, A cylinder body having a plurality of spark plugs provided in each of the plurality of explosion chambers, A cylindrical flywheel pivotally attached to the cylinder body and positioned on one side of the cylinder body that does not have a ring groove, At least one rotating shaft is located on one side of the flywheel and drilled into the shaft hole, with an axial bearing, a gasket, and a locking member provided at the end of the rotating shaft protruding from the shaft hole, A ring-shaped groove is provided at one end of the flywheel, facing the plurality of nitrogen gas chambers and the plurality of explosion chambers, A plurality of internal guide holes are provided inside the flywheel, which are inclined at a specific angle by the ring-shaped groove and penetrate the flywheel, A liquid nitrogen engine comprising a flywheel having a plurality of external guide rails provided on the outer surface of the flywheel and parallel to the plurality of internal guide holes.

2. Furthermore, the liquid nitrogen engine according to claim 1, comprising a cover which is a hollow cylindrical body connected to the cylinder body and provided as a cover on the outside of the flywheel, and having openings at both ends.

3. The liquid nitrogen engine according to claim 1, wherein each of the plurality of explosion chambers has a gas inlet, an exhaust gas outlet facing the link-shaped groove, an ignition port for installing the spark plug, an intake valve provided at the gas inlet, and an exhaust valve provided at the exhaust gas outlet.

4. The liquid nitrogen engine according to claim 1, wherein each of the plurality of nitrogen gas chambers has an intake port, an exhaust port facing the ring-shaped groove, and a nozzle provided in the intake port.

5. The liquid nitrogen engine according to claim 1, wherein the specified angle is between 30 and 60 degrees.

6. The liquid nitrogen engine according to claim 1, wherein there are bearings at both ends of the shaft hole, and the rotating shaft passes through the plurality of bearings and the shaft hole so as to pivotally attach the flywheel to the cylinder body.

7. The liquid nitrogen engine according to claim 1, wherein the other side of the flywheel further has a rotating shaft.

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