Spark ignition type two-stroke air-entrapped injection aviation kerosene engine

Abstract

The invention discloses a spark ignition type two-stroke air-entrapped injection aviation kerosene engine which comprises an engine body and an air-entrapped injection device, a combustion chamber and a crankshaft chamber are arranged in the engine body, two spark plugs are installed on the wall of the combustion chamber, and an air pump chamber used for providing compressed air for the air-entrapped injection device is arranged on the engine body. And the air pump chamber is communicated with the crankshaft chamber. According to the spark ignition type two-stroke air-entrained injection aviation kerosene engine, spark ignition type in-cylinder direct injection driving and double spark plug ignition are adopted, so that mixed fuel gas can be fully combusted, the engine performance is improved, emission is reduced, power is improved, and fuel oil loss is reduced; by the adoption of the air pump pressurization and air-entrained injection technology and perfect combination of pressurized gas and mixed oil atomization particles, the mixed particles of fuel oil are atomized more thoroughly, the diameter of the mixed particles can reach 5-8 micrometers, sufficient combustion under different oil product environments is achieved, direct injection in a cylinder is achieved, and spark ignition type pressurization work is achieved; and air inlet pressurization is achieved through the air pump, and the engine performance can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of engines, and in particular to a spark-ignited two-stroke air-injected jet kerosene engine. Background Art

[0002] Existing two-stroke jet fuel engines generally include an engine body, which is divided into a combustion chamber and a crank chamber. A piston is coaxially installed in the combustion chamber for sliding movement, a crankshaft is rotatably installed in the crank chamber, a crankshaft wheel is fixedly installed on the crankshaft, and the crankshaft wheel is connected to the piston through a connecting rod. A double spark plug is installed on the combustion chamber wall, and an oil-gas mixing injection valve is installed on the combustion chamber wall. The oil-gas mixing injection valve is connected to the oil-gas mixing chamber. When working, the fuel injector sprays oil into the oil-gas mixing chamber, and at the same time, the air pump chamber introduces air into the oil-gas mixing chamber. After the oil and air are mixed in the oil-gas mixing chamber, they are sprayed into the combustion chamber through the oil-gas mixing injection valve and ignited by the double spark plugs, thereby pushing the piston to move, and then the crankshaft is driven, and the motion state is transmitted outward through the crankshaft. The wall of the combustion chamber is also provided with an exhaust port, and the exhaust gas generated during the combustion of oil and gas is discharged outward through the exhaust port.

[0003] The two-stroke air injection engine of the prior art has the following problems:

[0004] 1. Air is usually supplied by an external air pump, which increases the overall weight of the engine and cannot meet the purpose of reducing fuel consumption.

[0005] 2. Jet fuel has a high ignition point and is difficult to ignite. Moreover, the oil and gas cannot be fully mixed, resulting in high fuel consumption and large losses.

[0006] Chinese patent application number 202110259019.8 discloses a spark-ignition supercharged two-stroke direct injection multi-combustion engine, comprising an engine body, a combustion chamber and a crank chamber within the engine body, a piston within the combustion chamber, a crankshaft within the crank chamber, a crankshaft wheel connected to the piston via a connecting rod, a spark plug, a fuel injector, and an air intake nozzle mounted on the combustion chamber wall, one end of the crankshaft extending from the crank chamber and connected to a starter by transmission, an air entrainment injection device, and an air compressor, the outlet end of the air entrainment injection device being connected to the fuel injector, one inlet end of the air entrainment injection device being connected to an oil pipe, the power shaft of the air compressor being connected to the crankshaft by transmission, the inlet end of the air compressor being in communication with the external environment, one air path at the outlet end of the air compressor being connected to the air intake nozzle, and another air path being connected to the air entrainment injection device. The present invention can improve engine performance, reduce losses, and achieve sufficient combustion in different oil environments.

[0007] It is desirable to provide an improved spark-ignition two-stroke air-injection jet kerosene engine, particularly with regard to reducing fuel consumption. Summary of the Invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a spark-ignition two-stroke air-injection jet kerosene engine, the purpose of which is to reduce the weight of the engine and reduce fuel consumption.

[0009] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an ignition-type two-stroke air-injection jet kerosene engine, comprising an engine body and an air-injection device, wherein a combustion chamber, an air pump chamber and a crankshaft chamber are provided in the engine body, two spark plugs are installed on the wall of the combustion chamber, the air pump chamber is configured to provide compressed gas to the air-injection device, and the air pump chamber is connected to the crankshaft chamber.

[0010] The air-entrained injection device includes a fuel injector, an oil-gas mixing chamber, a valve cap, a pressure regulating valve, an oil cap and an oil-gas mixing injection valve. The air pump chamber is connected to the pressure regulating valve, the pressure regulating valve is connected to the oil-gas mixing chamber, the fuel injector is arranged on the oil-gas mixing chamber, and the oil cap is connected to the end of the fuel injector that does not enter the combustion chamber as an inlet end.

[0011] The engine body includes a crankcase body, and the air pump chamber is integrated on the crankcase body.

[0012] The air pump chamber has two air outlets, which are respectively connected to the inlet ends of the two pressure regulating valves. The outlet ends of the two pressure regulating valves are connected to the inlet ends of the two oil-gas mixing chambers that do not enter the combustion chamber through two air outlet pipelines.

[0013] An explosion pressure sensor is installed on the combustion chamber wall.

[0014] An air intake device is arranged on the top of the crankcase body.

[0015] The air intake device includes a reed valve and a throttle valve. The inlet end of the reed valve is connected to the throttle valve and then communicated with the external environment. The outlet end of the throttle valve is connected to the inlet end of the crankcase through the reed valve.

[0016] An air pump piston is arranged in the air pump chamber, and the air pump piston is connected to a crank on the crankshaft through an air pump connecting rod.

[0017] One end of the crankshaft passes through the crankshaft chamber, and a starter is installed on the crankshaft chamber wall corresponding to the crankshaft passing through position, and the passing through end of the crankshaft is transmission connected to the starter.

[0018] The spark-ignition two-stroke air-injection jet kerosene engine of the present invention has the following beneficial effects:

[0019] 1. Spark-ignition direct injection drive and dual spark plug ignition ensure that the mixed gas can be fully burned, improving engine performance, reducing emissions, increasing power and reducing fuel consumption.

[0020] 2. The air pump boosting and air entrainment injection technology, the perfect combination of boosted gas and mixed oil atomized particles, makes the fuel mixed particles atomized more thoroughly, which can reach a diameter of 5-8 microns, realizes full combustion under different oil environments, achieves direct injection in the cylinder, and realizes ignition-type boosting work.

[0021] 3. Achieve intake pressure boost through the air pump to improve engine performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] This manual includes the following drawings, which show the following contents:

[0023] Figure 1 This is a top view of the spark-ignition two-stroke air-injection jet kerosene engine of the utility model;

[0024] Figure 2 1. It is a structural diagram of an air-entrained injection device;

[0025] Figure 3 Schematic diagram of the internal structure of the air pump chamber;

[0026] The markings in the figure are: 1. Crankcase; 2. Cylinder liner; 3. Spark plug; 4. Air-entrained injection device; 5. Valve bonnet; 6. Pressure regulating valve; 7. Air pump chamber; 8. Intake device; 9. Left air pipeline; 10. Right air pipeline; 11. Right air outlet pipeline; 12. Left air outlet pipeline; 13. Oil inlet; 14. Oil return port; 15. Left oil inlet pipeline; 16. Right oil inlet pipeline; 17. Fuel injector; 18. Oil cap; 19. Oil-gas mixing chamber; 20. Oil-gas mixing injection valve; 21. Air intake; 22. Air pump cover assembly; 23. Air pump piston; 24. Air pump connecting rod; 25. Crankshaft; 26. Air pump cam. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the specific implementation methods of the present invention through the description of embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and to facilitate its implementation.

[0028] like Figures 1 to 3As shown, the present invention provides a spark-ignition two-stroke air-injection jet fuel engine, comprising an engine body and an air-injection device 4. The engine body is provided with a combustion chamber, an air pump chamber, and a crank chamber. There are two combustion chambers, each with two spark plugs 3 mounted on its wall. The engine body is provided with an air pump chamber 7 for supplying compressed gas to the air-injection device 4, which is connected to the crank chamber. A piston is coaxially mounted for sliding movement in the combustion chamber, and a crankshaft 25 is rotatably mounted in the crank chamber. A crankshaft 25 has a crank connected to the piston via a connecting rod, with one end of the crankshaft extending from the crank chamber. An air pump piston 23 is disposed within the air pump chamber 7, connected to the crank on the crankshaft 25 via an air pump connecting rod 24. When the crankshaft 25 rotates, the air pump piston 23 is driven by the air pump connecting rod 24 to perform reciprocating linear motion within the inner cavity of the air pump chamber 7. One end of the crankshaft 25 passes through the crankshaft chamber. A starter is installed on the wall of the crankshaft chamber corresponding to the position where the crankshaft passes through. The passing end of the crankshaft 25 is transmission-connected to the starter.

[0029] like Figures 1 to 3 As shown, the air-entrained injection device 4 includes a fuel injector 17, an oil-gas mixing chamber 19, a valve cap 5, a pressure regulating valve 6, an oil cap 18 and an oil-gas mixing injection valve 20. The air pump chamber 7 is connected to the pressure regulating valve 6, the pressure regulating valve 6 is connected to the oil-gas mixing chamber 19, the fuel injector 17 is arranged on the oil-gas mixing chamber 19, and the oil cap 18 is connected to the end of the fuel injector 17 that does not enter the combustion chamber as an inlet end.

[0030] Two pressure regulating valves 6 and two oil-gas mixing chambers 19 are provided, and each oil-gas mixing chamber 19 is provided with a fuel injector 17. Each fuel injector 17 is used to inject fuel, which is aviation kerosene, into a combustion chamber. The air pump chamber 7 has two air outlets. The two air outlets of the air pump chamber 7 are respectively connected to the inlet ends of the two pressure regulating valves 6 through two air pipelines. The outlet ends of the two pressure regulating valves 6 are connected to the inlet ends of the two oil-gas mixing chambers 19 that do not lead into the combustion chambers through two air outlet pipelines. The inlet end of the air pump chamber 7 is connected to the crank chamber. The movement of the crankshaft drives the piston in the air pump chamber 7 to move up and down, pressing the air in the crankcase into the air pump chamber 7. The two air outlets of the air pump chamber 7 are respectively connected to the air inlet ends of the left air pipeline 9 and the right air pipeline 10.

[0031] The engine body comprises a left cylinder block and a right cylinder block, which are fixedly connected. The crankcase is a combined upper and lower structure, with a cylinder bore on each side of the crankcase, which communicates with the combustion chamber. A pressure regulating valve 6 is located on each side of the upper crankcase. A valve cap 5, located above the left regulating valve, forms a cavity with the pressure regulating valve 6, which serves as a backpressure compensation chamber for air pressure compensation. The two outlets of the valve cap 5 are connected to two oil caps 18 via left and right oil inlet lines 15 and 16, respectively. One outlet of the air pump chamber 7 is connected to the valve cap 5 via a left air line 9. The other outlet of the air pump chamber 7 is connected to the air inlet on the right cylinder block via a right air line 10. A chamber for mounting the pressure regulating valve 6 is located within the right side of the upper crankcase, and the air inlet communicates with the chamber. The air inlet ends of the right air outlet pipeline 11 and the left air outlet pipeline 12 are respectively connected to the outlet end of the pressure regulating valve 6 on the right cylinder body, and the air outlet ends of the right air outlet pipeline 11 and the left air outlet pipeline 12 are respectively connected to the inlet ends of the two oil-gas mixing chambers 19.

[0032] Both sides of the oil-gas mixing chamber 19 are opened as two inlet ends, one of which is for the fuel injector 17 to access, and the other is for the other air pipeline of the air pump chamber 7 to access.

[0033] The movement of the crankshaft drives the air pump piston 23 in the air pump chamber 7 to move up and down. The air pump piston 23 presses the air in the air pump chamber 7 into the oil cap 18. The upper end of the fuel injector 17 and the outlet end of the oil cap 18 form a cavity. The compressed gas entering the cavity breaks up the fuel, making it fully atomized, and finally enters the combustion chamber through the oil-gas mixing injection valve 20.

[0034] like Figures 1 to 3 As shown, the engine body includes a crankcase body 1, which is fixedly connected to the upper crankcase body and the lower crankcase body by bolts. The air pump chamber 7 is integrated on the crankcase body 1, and the crank chamber is located inside the crankcase body 1.

[0035] An air intake device 8 is provided on the top of the crankcase 1. The air intake device 8 includes a reed valve and a throttle. The inlet end of the reed valve is connected to the throttle and then communicated with the external environment. The outlet end of the throttle is connected to the inlet end of the crankcase 1 through the reed valve.

[0036] The working principle of the present invention is as follows: during the initial start-up, a starting torque is applied to the crankshaft through the starter to rotate the crankshaft. When the crankshaft rotates, it drives the air pump piston 23 to move and press the air in the crankshaft chamber from the air inlet 21 into the air pump chamber 7, thereby compressing the external air in the air pump chamber 7, and pressing the gas into the air path pipeline into the oil-gas mixing chamber 19 on both sides. Finally, the gas is fully mixed with the fuel in the oil-gas mixing chamber 19 to form mixed oil atomized particles, which are then sprayed into the combustion chamber through the oil-gas mixing injection valve 20.

[0037] Since the air-entrained injection device 4 is a tapered tube with a gradually changing diameter, and the end with the smallest diameter is connected to the oil-gas mixture injection valve 20 as the outlet end, it can form an air-entrained injection effect on the mixed oil atomized particles, so that the mixed oil atomized particles are injected into the combustion chamber through the oil-gas mixture injection valve 20.

[0038] After the mixed oil atomized particles injected into the combustion chamber are mixed with the air again, they are ignited by the spark plug 3 to form direct injection explosion in the cylinder, thereby pushing the piston and driving the crankshaft to rotate, realizing ignition-type work.

[0039] The diameter of the atomized particles of the high-pressure common rail technology is about 10-15 microns. In the present invention, the air pump chamber 7 is pressurized and the air-entrained injection technology is used, and the dual spark plug 3 ignition design is adopted to make the mixed particles more thoroughly atomized, and can reach a diameter of 5-8 microns, which is easier to ignite for high-ignition-point fuels such as aviation kerosene.

[0040] Finally, the exhaust gas generated in the combustion chamber is discharged through the exhaust ports in the cylinder sleeves 2 on both sides.

[0041] In the present invention, the starter adopts an electric starter, which is convenient for applying the initial starting force to the crankshaft without the need for a separate power device.

[0042] In the present invention, in order to ensure the purity of the air entering the combustion chamber, a filter is integrated on the throttle valve, and the air is filtered through the filter to improve the purity of the air entering the combustion chamber.

[0043] In the present invention, a burst pressure sensor is mounted on the combustion chamber wall. This sensor transmits the combustion chamber pressure signal to the ECU (central control unit). This controls the air and oil pressures by controlling the pressure regulating valves 6 on the left and right sides of the crankcase 1. The valve cap 5 at the upper end of the left pressure regulating valve 6 forms a cavity with the left pressure regulating valve 6. This cavity is a backpressure compensation chamber used to compensate for air pressure.

[0044] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described method. Any non-substantial improvements made using the method concepts and technical solutions of the present invention, or any direct application of the above-described concepts and technical solutions to other situations without modification, fall within the scope of protection of the present invention.

Claims

1. A spark-ignition two-stroke air-injection jet kerosene engine comprising an engine body and an air-injection device, wherein a combustion chamber, an air pump chamber, and a crankshaft chamber are provided in the engine body, and characterized by: Two spark plugs are installed on the combustion chamber wall. The air pump chamber is configured to provide compressed gas to the air-entrained injection device. The air pump chamber is communicated with the crankshaft chamber.

2. The spark-ignition two-stroke air-injection jet kerosene engine according to claim 1, characterized in that: The air-entrained injection device includes a fuel injector, an oil-gas mixing chamber, a valve cap, a pressure regulating valve, an oil cap and an oil-gas mixing injection valve. The air pump chamber is connected to the pressure regulating valve, the pressure regulating valve is connected to the oil-gas mixing chamber, the fuel injector is arranged on the oil-gas mixing chamber, and the oil cap is connected to the end of the fuel injector that does not enter the combustion chamber as an inlet end.

3. The spark-ignition two-stroke air-injection jet kerosene engine according to claim 2, characterized in that: The engine body includes a crankcase body, and the air pump chamber is integrated on the crankcase body.

4. The spark-ignition two-stroke air-injection jet kerosene engine according to claim 2, characterized in that: The air pump chamber has two air outlets, which are respectively connected to the inlet ends of the two pressure regulating valves. The outlet ends of the two pressure regulating valves are connected to the inlet ends of the two oil-gas mixing chambers that do not enter the combustion chamber through two air outlet pipelines.

5. The spark-ignition two-stroke air-injection jet kerosene engine according to any one of claims 1 to 4, characterized in that: An explosion pressure sensor is installed on the combustion chamber wall.

6. The spark-ignition two-stroke air-injection jet kerosene engine according to claim 3, characterized in that: An air intake device is arranged on the top of the crankcase body.

7. The spark-ignition two-stroke air-injection jet kerosene engine according to claim 6, characterized in that: The air intake device includes a reed valve and a throttle valve. The inlet end of the reed valve is connected to the throttle valve and then communicated with the external environment. The outlet end of the throttle valve is connected to the inlet end of the crankcase through the reed valve.

8. The spark-ignition two-stroke air-injected jet kerosene engine according to any one of claims 1 to 7, characterized in that: An air pump piston is arranged in the air pump chamber, and the air pump piston is connected to a crank on the crankshaft through an air pump connecting rod.

9. The spark-ignition two-stroke air-injected jet kerosene engine according to any one of claims 1 to 8, characterized in that: One end of the crankshaft passes through the crankshaft chamber, and a starter is installed on the crankshaft chamber wall corresponding to the crankshaft passing through position, and the passing through end of the crankshaft is transmission connected to the starter.

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