A compact axial single cylinder hydrogen fuel constrained piston hydraulic engine

Abstract

The present invention is a compact axial single-cylinder hydrogen fuel constrained piston hydraulic engine, which is composed of a cylinder head, a body, a piston, a piston pin, a connecting rod, a connecting plate, a connecting rod, a crankshaft, an oil pan, a plunger, a plunger cylinder, an oil channel, a flywheel, a distribution system, etc. The linear mechanical energy generated by the combustion of hydrogen in the engine piston is directly transmitted to the connecting plate to drive the plunger to absorb and pressurize oil. This invention is based on a single-cylinder hydrogen engine with mature technology, and the corresponding mechanical structure and hydraulic device are added to integrate the mechanical hydraulic conversion system, and the height of the body is not increased, which effectively solves the energy loss problem caused by the excessive length of the mechanical transmission chain, and the corresponding hydraulic components and mechanical structures are integrated by combining the body and the hydraulic integrated block to improve the integration of the system. Secondly, an oil replenishing device is provided to effectively solve the problem of large flow pulsation fluctuations caused by the engine piston at the upper and lower dead points.

Description

Technical Field

[0001] The present invention belongs to the field of compound power, and in particular relates to a compact axial single-cylinder constrained piston hydraulic engine. Background Art

[0002] At present, the traditional mechanical-hydraulic power conversion system is composed of two separate working systems, the engine and the plunger pump, which are mechanically connected. Due to the presence of two sets of crank-connecting rod mechanisms in the combined system, the excessive length of the mechanical motion transmission chain will cause a certain loss of mechanical efficiency. The free piston type internal combustion hydraulic power system reduces the mechanical moving parts such as connecting rods, crankshafts, and flywheels. There are problems of nonlinearity and instability of free piston motion without mechanical parts constraints, which seriously affects the system's working reliability, economy, and emissions. The performance advantages are not very great, which limits the promotion and application of this energy conversion system. The compact axial single-cylinder constrained piston hydraulic engine solves the problems of the first two well, and can also output mechanical energy and hydraulic energy at the same time. Summary of the invention

[0003] The invention provides a compact axial single-cylinder hydrogen fuel constrained piston hydraulic engine, aiming at improving the conversion efficiency of the engine by shortening the mechanical hydraulic conversion power transmission chain.

[0004] Technical solution: The embodiment of the present invention provides the structure of a compact axial single-cylinder hydrogen fuel constrained piston hydraulic engine.

[0005] Engine connection: cylinder head, engine body, oil pan. Mechanical moving parts connection: piston is connected to connecting rod through piston pin, connecting rod is connected to crankshaft, crankshaft is connected to flywheel, piston pin is connected to connecting plate through round sleeve on connecting rod, connecting plate has two bolt holes, plunger is fixed on connecting plate through two bolt holes, the position of connecting plate for installing plunger is located on both sides of piston, distributed in the engine body on both sides of piston assembly.

[0006] Hydraulic device connection: The plunger cylinders distributed in the body on both sides of the piston assembly are connected to the distribution system through oil channels. The distribution system includes a one-way valve, an oil replenishing device and an oil tank. The oil replenishing device is composed of a solenoid valve and a pressure accumulation chamber. When the hydraulic oil pulsation is at the peak and the pressure reaches the pressure value set by the solenoid valve, a part of the hydraulic oil enters the pressure accumulation chamber for storage. When the engine piston works at the upper and lower dead points, that is, the hydraulic oil pulsation is at the trough, the hydraulic oil stored in the pressure accumulation chamber is discharged through the solenoid valve to the output oil channel and merged with the original hydraulic oil in the oil channel to provide a hydraulic power source for the load.

[0007] Beneficial effects: By adopting the above scheme, the corresponding mechanical and hydraulic devices are built into the original engine without increasing the height to integrate the mechanical and hydraulic conversion system, reducing the energy loss caused by multiple mechanical connections, improving the conversion efficiency of the engine, and directly converting thermal energy into mechanical energy and hydraulic energy, turning the engine from a single energy conversion source into a composite energy conversion source. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is the schematic diagram of a compact axial single-cylinder constrained piston hydraulic engine;

[0009] Figure 2 This is the oil passage layout diagram;

[0010] Figure 3 It is the axonometric drawing of the connection plate;

[0011] Figure 4 It is the hydraulic principle diagram;

[0012] Figure 5 It is the energy conversion diagram;

[0013] In the figure, 1. cylinder head 2. piston 3. piston pin 4. connecting rod 5. plunger cylinder 6. plunger 7. connecting plate 8. connecting rod 9. crankshaft 10. oil pan 11. oil channel 12. flywheel 13. plunger pump 14. oil channel 15. plunger 16. connecting plate 17. connecting rod 18. one-way valve 19. plunger pump 20. hydraulic oil tank 21. input solenoid valve 22. output solenoid valve 23. pressure storage chamber 24. unloading valve DETAILED DESCRIPTION

[0014] exist Figure 1 In the figure, the piston 2 is connected to the connecting rod 4 through the piston pin 3, and the connecting rod 4 is fixed on the connecting plate 7 (the connection between the two is bolted or directly cast), and two plungers 6 are fixed on the connecting plate 7 (the connection between the two is bolted), and the two plungers are distributed in the upper body on both sides of the piston assembly, and the upper body is built with a plunger cylinder 5. When the engine is working, the piston 2 moves back and forth with the plunger 6 through the connecting rod 4 and the connecting plate 7 to complete the oil suction and oil pressure work. The piston 2 is connected to the connecting rod 8 through the piston pin 3, and the connecting rod 8 is connected to the crankshaft 9, and the crankshaft 9 is connected to the flywheel 12. When the engine is working, the conversion from linear mechanical motion to rotary mechanical motion is completed. Secondly, the flywheel plays the role of storing energy and provides power for the return of the entire mechanical connection component.

[0015] exist Figure 2 In the figure, the arrangement positions of the plunger cylinder 13 and the hydraulic oil channel 14 inside the machine body are shown, without interfering with the movement of mechanical moving parts such as the piston.

[0016] exist Figure 3In the embodiment, the connecting plate 16 is provided with bolt holes, and the plunger 15 is fixed on the connecting plate 16 through the bolt holes. The connecting rod 17 on the connecting plate 16 is connected to the piston pin through the round sleeve above. The connection between the connecting plate and the connecting rod is directly cast by bolt connection, and the entire motion transmission chain from the piston pin to the plunger is simple and reliable. There is a square hole in the middle of the connecting plate 16, which is used as a connecting rod through hole. In the process of converting linear motion to rotary motion, the connecting rod will swing continuously, so the square hole leaves enough space to prevent interference with the swinging motion of the connecting rod.

[0017] exist Figure 4 During the oil suction, the piston drives the plunger to move downward, and a pressure difference is generated between the plunger cylinder and the outside world. The hydraulic oil in the hydraulic oil tank 20 will be sucked into the plunger cylinder through the one-way valve 18. During the oil compression, the piston drives the plunger to press the hydraulic oil out to form high-pressure hydraulic oil. The high-pressure oil is output to the load through the one-way valve 18 and the oil replenishing device. The input solenoid valve 21 in the oil replenishing device will open when the hydraulic oil pulsation is at the peak, and a small part of the high-pressure oil will be stored in the pressure accumulation chamber 23. When the engine is working at the dead point, the hydraulic oil pulsation is at the trough, the output solenoid valve 22 is opened, and the high-pressure oil in the pressure accumulation chamber 23 is output to the output oil channel and merges with the hydraulic oil in the oil channel to be output to the load. The unloading valve 24 is connected to the pressure accumulation chamber 23 to ensure that the hydraulic oil in the pressure accumulation chamber 23 is stable.

[0018] exist Figure 5 The energy conversion process during the operation of the engine is shown in the figure. The hydrogen fuel burns in the cylinder and converts the heat energy into the linear mechanical energy of the piston through expansion. Then, reliable hydraulic energy is generated through the plunger and the distribution system. At the same time, it is converted into rotational mechanical energy through the original connecting rod and crankshaft mechanism. The composite power source composed of hydraulic energy and rotational mechanical energy can be supplied to the load at the same time.

[0019] The above specific embodiments are only used to explain the present invention rather than to limit the present invention. Within the scope of protection of the purpose of the present invention and the claims, any replacement and change made to the present invention without creative work shall fall within the scope of protection of the patent of the present invention.

Claims

1. A compact axial single-cylinder hydrogen fuel constrained piston hydraulic engine, characterized in that The piston is connected to the connecting rod, the connecting plate and the plunger. The plunger and the plunger cylinder are distributed in the upper body on both sides of the piston assembly. The left and right ends of the piston are respectively connected to the two connecting rods on both sides through the piston pin. The connecting rod is fixed on the connecting plate. Two plungers are fixed on the connecting plate. The two plungers are distributed in the upper body on both sides of the piston assembly. The upper body has a built-in plunger cylinder. When the engine is working, the piston carries the plunger to perform reciprocating linear motion through the connecting rod and the connecting plate to complete the oil suction and oil pressure work. The upper body performs the role of a hydraulic integrated block, that is, while expanding the corresponding volume of the body, the plunger cylinder is directly built into the upper body on both sides of the piston assembly. Corresponding oil channels are arranged in the body to connect the distribution system to output hydraulic energy to the outside. The hydraulic engine completes the conversion of hydrogen fuel thermal energy into hydraulic energy; On the one hand, the piston is connected to the connecting rod, crankshaft and flywheel in sequence through the piston pin, and the linear reciprocating motion of the piston is converted into the rotational motion of the crankshaft, completing the conversion of the thermal energy of hydrogen fuel combustion into mechanical energy. The flywheel serves as an energy storage device to provide power for the return stroke of the moving parts. As a composite power source, the thermal energy of hydrogen fuel is simultaneously converted into rotational mechanical energy and hydraulic energy for external output. The hydraulic engine connecting plate is connected to the piston pin through a round sleeve on the upper part of the connecting rod, and the plunger is fixed in the bolt hole on the connecting plate and is arranged in the plunger cylinder in the body on both sides of the piston assembly. The connecting plate is provided with a square hole, which serves as a connecting rod through hole. During the conversion process from linear motion to rotational motion, the connecting rod will swing continuously, and the square hole leaves enough space to prevent interference with the swinging motion of the connecting rod.

2. A compact axial single cylinder hydrogen fuel constrained piston hydraulic engine as claimed in claim 1, characterized in that The plunger cylinders distributed in the body on both sides of the piston assembly are connected to the distribution system through oil channels. The distribution system includes a one-way valve, an oil replenishing device and an oil tank. The oil replenishing device is composed of an input solenoid valve, an output solenoid valve, a unloading valve and a pressure storage chamber. When the hydraulic engine absorbs oil, the piston drives the plunger to move downward, and an air pressure difference is generated between the plunger cylinder and the outside world. The hydraulic oil in the hydraulic oil tank is sucked into the plunger cylinder through the one-way valve. When the oil is pressed, the piston drives the plunger to press the hydraulic oil out to form high-pressure hydraulic oil. The high-pressure oil is output to the load through the one-way valve and the oil replenishing device. The input solenoid valve in the oil replenishing device will open when the hydraulic oil pulsation is at the peak, and a small part of the high-pressure oil will be stored in the pressure storage chamber. When the engine works at the upper and lower dead points, the hydraulic oil pulsation is at the trough at this time, the output solenoid valve is opened, and the high-pressure oil in the pressure storage chamber is output to the output oil channel and merges with the hydraulic oil in the oil channel to be output to the load. The unloading valve is connected to the pressure storage chamber to ensure the stability of the hydraulic oil in the pressure storage chamber.

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