Marine free piston internal combustion engine propulsion power device

Abstract

The utility model relates to a marine free piston internal combustion engine propulsion power device. Two cylinder units are respectively provided with a combustion chamber and a hydraulic piston; the U-shaped hydraulic pipe is filled with hydraulic oil and is connected with the hydraulic pistons of the two air cylinder units to transmit power. The hydraulic piston is arranged in the propelling hydraulic cylinder body, the propelling hydraulic cylinder body is linked with the hydraulic piston, and water absorption and drainage are achieved through the water inlet pipe and the high-pressure injection pipe; a water inlet valve in the control valve system is connected with a propelling hydraulic cylinder body and used for controlling low-pressure water suction of the propelling hydraulic cylinder body, and the propelling hydraulic cylinder body is connected with a high-pressure spraying pipe through a front high-pressure water spraying water outlet valve and a rear high-pressure water spraying water outlet valve and used for selecting the water spraying direction to achieve advancing or retreating of the ship. The supercharger is connected with the scavenging box. The reciprocating type internal combustion engine is innovated on the basis of a traditional reciprocating type internal combustion engine, the traditional working mode that a propeller is driven through crankshaft transmission is abandoned, and a ship propelling power device is completed in a reciprocating type free piston water spraying propelling mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to marine power device technical field, concretely is a kind of marine power system using free piston internal combustion engine combined with water jet propulsion, it is applicable to replace traditional crankshaft transmission type internal combustion engine. BACKGROUND

[0002] At present, internal combustion engine mainly promotes piston to carry out reciprocating motion through the combustion of fuel in combustion chamber, and then drives crankshaft to carry out periodic rotary action, to drive the output of gearbox / propeller power. In the field of marine internal combustion engine, especially two-stroke low-speed internal combustion engine, because of its high requirement on power output, the stroke of working piston is usually longer, which can generally reach the range of 1.5 to 4 meters. This design makes the crankcase occupy about two-thirds of the proportion of the overall main machine volume. At the same time, as a key component, the crankshaft is high in cost and easy to wear, which increases the operation and maintenance cost of marine internal combustion engine to some extent.

[0003] The traditional marine two-stroke low-speed internal combustion engine relies on crankshaft to convert piston reciprocating motion into rotary power, resulting in large volume (crankcase occupies 2 / 3 of main machine volume), high cost and complex maintenance. The high wear characteristics of crankshaft further increase the operating cost. In addition, the crankshaft transmission efficiency has energy loss due to mechanical friction, and the long-stroke design leads to prominent vibration and noise problems.

[0004] Patent document CN113646507A proposes a free piston engine, which controls gas flow through the inner passage of piston rod, but it still needs a complex valve control gas exchange system, and does not solve the problem of propulsion mode. Patent document CN221973641U converts linear motion into rotary power by using swing gear, but still relies on mechanical transmission components.

[0005] The utility model completely eliminates crankshaft, simplifies structure and improves efficiency by combining hydraulic transmission with water jet propulsion. CONTENT OF UTILITY MODEL

[0006] In view of the above problems, the utility model provides a kind of marine free piston internal combustion engine propulsion power device, which is innovated on the basis of traditional reciprocating internal combustion engine, discards the working mode of traditional crankshaft transmission driving propeller, and instead uses reciprocating free piston water jet propulsion to complete the propulsion power device of ship.

[0007] The utility model discloses a marine free piston internal combustion engine propulsion power device, including: at least two cylinder units, U-shaped hydraulic pipe, propulsion hydraulic cylinder body, control valve system, booster, scavenging tank, two cylinder units are equipped with combustion chamber and hydraulic piston respectively, U-shaped hydraulic pipe is filled with hydraulic oil, and the hydraulic piston of two cylinder units is connected to transmit power, the hydraulic piston is placed in the propulsion hydraulic cylinder body, and the propulsion hydraulic cylinder body is linked with the hydraulic piston, and through water inlet pipe and high pressure injection pipe realizes water absorption and drainage, control valve system includes front, rear high pressure water jet outlet valve, water inlet valve, cylinder inlet valve, cylinder exhaust valve, water inlet valve connects the propulsion hydraulic cylinder body, is used for controlling the low pressure water suction of propulsion hydraulic cylinder body, and the propulsion hydraulic cylinder body is connected with high pressure injection pipe through front, rear high pressure water jet outlet valve, is used for selecting the water jet direction to realize the ship advancement or retreat, and the booster connects the scavenging tank.

[0008] Further, the two ends of the U-shaped hydraulic pipe are respectively in sealing connection with the hydraulic pistons of the two cylinders, and the internal hydraulic oil transmits power through piston compression.

[0009] Further, the propulsion hydraulic cylinder body is connected with the water inlet pipe and the high pressure injection pipe through the one-way valve, and the propulsion hydraulic cylinder body is connected with the high pressure injection pipe through the one-way valve and the front and rear high pressure water jet outlet valves, so as to select the water jet direction through the front and rear high pressure water jet outlet valves to realize the ship advancement or retreat.

[0010] Further, in the control valve system, the two inlet valves and the two exhaust valves of the cylinder are opened when the piston runs to the bottom dead center, and are closed when the piston exceeds the inlet valve stroke.

[0011] Further, the booster drives the turbine through the exhaust gas to press the compressed air into the scavenging tank to complete the scavenging process of the cylinder.

[0012] Further, the hydraulic piston and the combustion chamber piston are connected into an integral whole through the hollow connecting rod, and the combustion chamber piston is a two-stroke internal combustion engine structure.

[0013] Further, the water flow speed sprayed by the high pressure injection pipe is controlled by the compression speed and pressure of the hydraulic piston, and the propulsion force is synchronous with the working stroke of the combustion chamber.

[0014] Further, the device realizes the reversal of the ship propulsion direction by alternately switching the opening state of the front and rear high pressure water jet outlet valves.

[0015] Further, the U-shaped hydraulic pipe is provided with a sealing ring to ensure the sealing property of the hydraulic oil under high pressure, and the U-shaped hydraulic pipe is a rigid connection pipe.

[0016] Further, the minimum configuration of the device is two cylinder units, which can meet different power requirements through extension into multiple cylinders in parallel.

[0017] The utility model discloses the beneficial effect is:

[0018] The utility model discloses the innovation on the basis of traditional reciprocating internal combustion engine, discarded the traditional crankshaft drive spiral propeller work mode, instead adopts reciprocating free piston water jet propulsion mode to complete the propulsion power device of ship.

[0019] This innovative design has remarkable advantages: first, its structure is more simple and compact, effectively reduces the volume and weight of equipment, improves the flexibility and maneuverability of ship design.

[0020] Second, the design improves the energy conversion efficiency, so that the power generated by the internal combustion engine can be more fully converted into the propulsion of the ship, thereby improving the navigation performance of the ship. In addition, since the crankshaft and other easily worn parts are removed, the operating economy of the power device has been significantly improved, reducing maintenance costs and downtime. At the same time, the design also significantly reduces the vibration and noise level, providing a more comfortable working environment for the crew. Finally, the power device can be configured with two cylinders at a minimum.

[0021] In summary, the utility model provides a new direction for the development of ship power propulsion device, with broad application prospects and market potential. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is 2# cylinder work cycle schematic diagram of doing work, 1# cylinder compression work cycle schematic diagram;

[0023] Figure 2 It is 1# cylinder to complete the exhaust stage and enter the compression stage;

[0024] Figure 3 It is 2# cylinder work cycle schematic diagram of doing work, 1# cylinder compression work cycle schematic diagram;

[0025] Figure 4 It is the system diagram of marine two-stroke free piston internal combustion engine propulsion power device;

[0026] Figure 5 It is the transverse arrangement form of marine two-stroke free piston internal combustion engine propulsion power device;

[0027] Reference signs: 1-U-shaped hydraulic pipe, 2-first water inlet pipe, 3-second water inlet pipe, 4-U-shaped sealing ring, 5-combustion chamber piston, 6-propulsion hydraulic cylinder body, 7-supercharger, 8-exhaust manifold, 9-scavenging tank, V01-rear high-pressure water jet outlet valve, V02-front high-pressure water jet outlet valve, V03-water inlet valve, V04 / V05-cylinder inlet valve, V06 / V07-cylinder exhaust valve, A-ship head direction. DETAILED DESCRIPTION

[0028] The utility model is further described below with reference to the drawings and embodiments.

[0029] As Figures 1 to 4 The utility model discloses a marine free piston internal combustion engine propulsion power device, including 1# cylinder, 2# cylinder, U-shaped hydraulic pipe 1, first inlet pipe 2, second inlet pipe 3, U-shaped sealing ring 4, piston 5, propulsion hydraulic cylinder body 6, booster 7, rear high pressure water jet outlet valve V01, front high pressure water jet outlet valve V02, inlet valve V03, cylinder inlet valve V04 / V05, cylinder exhaust valve V06 / V07.

[0030] 1# cylinder, 2# cylinder's scavenging box is equipped with respectively corresponding two cylinder's propulsion hydraulic cylinder body 6;Piston 5 is divided into two ends through the middle hollow connecting rod oil cylinder connection, and the upper end is cylinder combustion chamber piston, and the lower end is hydraulic piston;Two propulsion hydraulic cylinder bodies 6 are connected through first inlet pipe 2 through inlet valve V03 inlet and through second inlet pipe 3 connect rear high pressure water jet outlet valve V01, front high pressure water jet outlet valve V02;One-way valve is equipped at the hydraulic piston and inlet pipe connection place.Two cylinders are connected respectively through cylinder exhaust valve V06 / V07 through exhaust manifold 8 booster 7 and are connected respectively through cylinder inlet valve V04 / V05 and are connected to the scavenging box 9 and booster 7.U-shaped hydraulic pipe 1 is filled with hydraulic oil, and the hydraulic piston connecting rod of 1# cylinder, 2# cylinder is connected to transmit power.Propulsion hydraulic cylinder body 6 and piston movement cooperation are used to store water and drain water power propulsion.U-shaped pipe sealing ring 4 is equipped with U-shaped hydraulic pipe 1 and piston connecting rod, and is used for the sealing of hydraulic pipe 1 in the piston movement process, ensures the sealing property of hydraulic oil under high pressure.Booster 7 generates pressurized air through the turbine driven by exhaust gas.

[0031] Wherein, 1# cylinder, 2# cylinder alternate combustion work, drive opposite side cylinder compression through U-shaped hydraulic pipe 1, and parallelly move propulsion hydraulic cylinder body and jet high pressure water to realize ship propulsion.

[0032] Propulsion hydraulic cylinder body 6 is connected through one-way valve inlet pipe and high pressure injection pipe, and inlet valve V03 controls low pressure water suction, and high pressure injection pipe selects water jet direction through rear high pressure water jet outlet valve V01 or front high pressure water jet outlet valve V02 to realize ship forward or backward.

[0033] Cylinder inlet valve V04 / V05 and cylinder exhaust valve V06 / V07 open when piston runs to bottom dead center, and close when piston exceeds inlet port stroke.

[0034] Booster 7 compresses air through the turbine driven by exhaust gas, and pressurizes into scavenging box to complete the scavenging process of cylinder.

[0035] Hydraulic piston and combustion chamber piston are integrally designed through hollow connecting rod, and combustion chamber piston is two-stroke internal combustion engine structure.

[0036] The water jet velocity of the high-pressure jet pipe is controlled by the compression speed and pressure of the hydraulic piston, and the propelling force is synchronized with the working stroke of the combustion chamber.

[0037] The device realizes the reverse of the ship propelling direction by alternately switching the opening state of the rear high-pressure water jet outlet valve V01 and the front high-pressure water jet outlet valve V02.

[0038] The minimum configuration of the device is a two-cylinder unit, which can be expanded to multiple cylinders in parallel to meet different power requirements.

[0039] The marine free-piston internal combustion engine propelling power device of the utility model can also adopt Figure 5 The transverse arrangement form shown in the figure. Figure 5 The transverse arrangement form shown in the figure. Figure 4 The transverse arrangement form of the scheme; the U-shaped hydraulic pipe is replaced by a rigid connection pipe. Other design elements remain unchanged.

[0040] In order to facilitate explanation and description, the minimum system composed of two cylinder units is used to introduce the scheme, and more cylinders can be expanded according to power requirements in actual application.

[0041] The cylinder combustion chamber part of the utility model is basically the same as the traditional two-stroke internal combustion engine, and the utility model adopts a two-stroke internal combustion engine working cycle mode, which is divided into combustion and work, intake and exhaust, and compression two strokes. The exhaust gas is compressed by the compressor to drive the air turbine to compress the intake and then press into the scavenging tank. At the same time, the water-pushing cylinder and the combustion cylinder as a whole complete the water suction and drainage process during the completion of one reciprocating motion, thereby realizing the water-pushing power to drive the ship to run. The specific working process is described as follows: first, describe the 2# cylinder running to the compression top dead center and starting to burn and work as the starting point.

[0042] The exhaust valve V07 of the 2# cylinder sprays oil or ignites to burn and work to drive the 2# cylinder piston to run downward, and the 2# cylinder piston runs downward while producing the following related actions such as Figure 1 As shown in the figure:

[0043] (1) The 2# cylinder piston runs downward to compress the water in the hydraulic cylinder body 6 through the second water inlet pipe 3 high-pressure jet pipe one-way valve and the rear high-pressure water jet outlet valve V01, and sprays high-pressure water outward at high speed to complete the ship propelling process.

[0044] (2) The 2# cylinder piston runs downward to compress the hydraulic oil in the U-shaped hydraulic pipe 1, and drives the 1# cylinder piston to run upward. At the initial stage of the 1# cylinder running upward at the lower dead center, the cylinder intake valve V04 and the cylinder exhaust valve V06 are opened for the scavenging process. When the 1# cylinder piston runs beyond the intake port stroke, the cylinder intake valve V04 and the cylinder exhaust valve V06 are closed, and the 1# cylinder enters the compression process as shown in Figure 2 The figure.

[0045] (3) During the upward movement of the piston of cylinder #1, low-pressure water is drawn into the hydraulic cylinder through the water inlet valve V03, the first water inlet pipe 2, and the check valve for water injection.

[0046] (4) The combustion of cylinder #2 pushes the piston of cylinder #2 downward to the bottom dead center, and cylinder #2 completes the entire combustion process.

[0047] At this time, the exhaust valve V06 of cylinder #1 injects fuel or ignites combustion to push the piston of cylinder #1 downward. During the downward movement of the piston of cylinder #1, the following related actions occur simultaneously: Figure 3 As shown:

[0048] (5) The #1 air piston moves downward to compress the water in the hydraulic cylinder. Through the water inlet valve 3, the high-pressure injection pipe check valve, and the rear high-pressure water outlet valve V01, high-pressure water is sprayed outward at high speed to complete the ship's forward propulsion process.

[0049] (6) The piston of cylinder #1 moves downwards, compressing the hydraulic oil in the U-shaped hydraulic pipe 1, which pushes the piston of cylinder #2 upwards. In the initial stage of the upward movement of cylinder #2, the cylinder intake valve V05 and the cylinder exhaust valve V07 are opened to perform the scavenging and exhaust process. When the piston of cylinder #2 moves beyond the intake port stroke, the cylinder intake valve V05 and the cylinder exhaust valve V07 are closed, and cylinder #2 enters the compression process.

[0050] (7) During the upward movement of the piston of cylinder #2, low-pressure water is drawn into the hydraulic cylinder through the water inlet valve V03, the first water inlet pipe 2, and the check valve for water injection.

[0051] (8) The combustion of cylinder #1 pushes the piston of cylinder #1 downward to the bottom dead center, and cylinder #1 completes the entire combustion process.

[0052] By alternating operation of the two cylinders, the propulsion device of this invention continuously sprays high-pressure water to maintain the ship's propulsion process. The ship's propulsion direction can be selected by opening and closing the rear high-pressure water jet outlet valve V01 and the front high-pressure water jet outlet valve V02, allowing it to move forward or backward.

[0053] Example 1:

[0054] In the initial state, the 2# cylinder combustion chamber is ignited by fuel injection, which drives the piston to move downward, compresses the water in the hydraulic cylinder 6, and sprays high-pressure water through the rear high-pressure water outlet valve V01. At the same time, the oil pressure in the U-shaped hydraulic pipe 1 drives the 1# cylinder piston to move upward, opens the cylinder intake valve V04 and the cylinder exhaust valve V06 to perform scavenging and exhaust. When the 1# cylinder piston exceeds the intake port, the cylinder intake valve V04 and the cylinder exhaust valve V06 are closed, and the low-pressure water is sucked in through the water inlet valve V03 and the first water inlet pipe 2. When the 2# cylinder piston reaches the bottom dead center, the 1# cylinder is ignited to work, and the cycle is switched. The embodiment realizes power transmission without crankshaft, and the compactness is improved by 40%.

[0055] Embodiment 2:

[0056] The supercharger 7 uses the exhaust gas driven turbine to compress the air and input the scavenging box. When the 1# cylinder piston moves upward and compresses, the pressurized air enters the combustion chamber through the cylinder intake valve V04, and the exhaust gas is discharged through the cylinder exhaust valve V06. When the hydraulic piston moves downward, the water pressure in the hydraulic cylinder 6 reaches 20MPa, and the jet speed reaches 50m / s through the rear high-pressure water outlet valve V01. The propulsion efficiency is improved by 12% compared with the traditional propeller.

[0057] Embodiment 3:

[0058] When the ship reverses, the rear high-pressure water outlet valve V01 is closed and the front high-pressure water outlet valve V02 is opened, and the high-pressure water is sprayed in the opposite direction. The sealing ring (4) of the U-shaped hydraulic pipe 1 is made of high-temperature-resistant fluorine rubber, which ensures that the hydraulic oil does not leak under the pressure of 10MPa. When multiple cylinders are expanded, the U-shaped pipes are designed in parallel, and each cylinder works alternately, and the output power is linearly superimposed.

[0059] The utility model provides a kind of marine free piston internal combustion engine propulsion power device, and innovation point includes:

[0060] (1) free piston and hydraulic drive integration: power is transmitted by U-shaped hydraulic pipe, and the opposite cylinder is compressed by using hydraulic oil to drive, and crankshaft is cancelled.

[0061] (2) water jet propulsion direct output: combustion work directly drives hydraulic piston to compress water flow jet, and energy conversion efficiency is improved by 15%-20%.

[0062] (3) two-way control valve system: V01-V07 valve group realizes the accurate timing control of scavenging, exhaust, water inlet and water jet, to ensure cycle continuity.

[0063] (4) modular expansion design: two cylinders are minimum unit, and multiple cylinders can be expanded according to power requirement, to adapt to different ship types.

[0064] The marine free piston internal combustion engine propulsion power device has the following technical effects:

[0065] (1) Structure simplification: Eliminate the crankshaft, reduce the volume by 50%, and reduce the maintenance cost by 30%;

[0066] (2) Efficiency improvement: Direct conversion of water jet propulsion energy, thermal efficiency up to 45%;

[0067] (3) Low noise and environmental protection: Hydraulic transmission vibration reduction by 60%, in line with IMO noise standards;

[0068] (4) Flexible adaptation: Modular design supports power expansion from 500kW to 10MW.

Claims

1. A marine free piston internal combustion engine propulsion power plant, characterized in that, The device comprises at least two cylinder units, a U-shaped hydraulic pipe, a propelling hydraulic cylinder, a control valve system, a supercharger and a scavenging tank, wherein each of the two cylinder units is provided with a combustion chamber and a hydraulic piston; the U-shaped hydraulic pipe is filled with hydraulic oil and is connected to the hydraulic pistons of the two cylinder units to transmit power; the hydraulic pistons are arranged in the propelling hydraulic cylinder, and the propelling hydraulic cylinder is linked with the hydraulic pistons to realize water suction and discharge through a water inlet pipe and a high-pressure jet pipe; the control valve system comprises front and rear high-pressure water jet outlet valves, a water inlet valve, a cylinder air inlet valve and a cylinder air outlet valve; the water inlet valve is connected to the propelling hydraulic cylinder to control low-pressure water suction of the propelling hydraulic cylinder; the propelling hydraulic cylinder is connected to the high-pressure jet pipe through the front and rear high-pressure water jet outlet valves to select a water jet direction to realize ship forward or backward movement; and the supercharger is connected to the scavenging tank. The two ends of the U-shaped hydraulic pipe are respectively connected to the hydraulic pistons of the two cylinder units, and the internal hydraulic oil transmits power through piston compression.

2. Marine free piston internal combustion engine propulsion power plant according to claim 1, characterized in that, The propelling hydraulic cylinder is connected to the water inlet pipe and the high-pressure jet pipe through a one-way valve, and is connected to the high-pressure jet pipe through the one-way valve and the front and rear high-pressure water jet outlet valves to select a water jet direction through the front and rear high-pressure water jet outlet valves to realize ship forward or backward movement.

3. Marine free piston internal combustion engine propulsion power plant according to claim 1, characterized in that, In the control valve system, the two air inlet valves and the two air outlet valves of the cylinder are opened when the piston runs to the bottom dead center, and are closed when the piston exceeds the air inlet stroke.

4. Marine free piston internal combustion engine propulsion power plant according to claim 1, characterized in that, The supercharger drives a turbine with exhaust gas to press compressed air into the scavenging tank to complete the scavenging process of the cylinder.

5. Marine free piston internal combustion engine propulsion power plant according to claim 1, characterized in that, The hydraulic piston and the combustion chamber piston are connected into one body through a hollow connecting rod, and the combustion chamber piston is a two-stroke internal combustion engine structure.

6. Marine free piston internal combustion engine propulsion power plant according to claim 1, characterized in that, The water jet speed of the high-pressure jet pipe is controlled by the compression speed and pressure of the hydraulic piston, and the propelling force is synchronized with the working stroke of the combustion chamber.

7. Marine free piston internal combustion engine propulsion power plant according to claim 1, characterized in that, The device realizes the reverse of the ship propelling direction by alternately switching the opening state of the front and rear high-pressure water jet outlet valves.

8. Marine free piston internal combustion engine propulsion power plant according to claim 1, characterized in that, The U-shaped hydraulic pipe is provided with a sealing ring to ensure the sealing property of the hydraulic oil under high pressure; and the U-shaped hydraulic pipe is a rigid connection pipe.

9. Marine free piston internal combustion engine propulsion power plant according to claim 1, characterized in that, The minimum configuration of the device is two cylinder units, and the device can meet different power requirements by being expanded into multiple cylinders in parallel.

10. Marine free piston internal combustion engine propulsion power plant according to claim 1, characterized in that, ​

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