Variable compression ratio piston regulation system, engine and vessel

Abstract

The utility model relates to the technical field of engine, specifically disclose variable compression ratio piston adjusting system, engine and ship, this variable compression ratio piston adjusting system includes adjusting assembly and at least one piston assembly, and piston assembly includes crosshead and piston rod, and the crosshead is provided with hydraulic cavity, and one end of piston rod is inserted in the hydraulic cavity and is relative crosshead sliding fit, adjusting assembly includes hydraulic oil tank, liquid pump, oil inlet valve and oil outlet valve, and the oil outlet of hydraulic oil tank, liquid pump and the oil inlet of oil inlet valve are in proper order series connection, and the oil outlet of oil inlet valve and the oil inlet of hydraulic cavity communicate, and the oil outlet of oil outlet valve and the oil return of hydraulic oil tank communicate, and the oil inlet of oil outlet valve and the oil outlet of hydraulic cavity communicate, the length that piston rod is controlled from the length that stretches out in the hydraulic cavity through the opening of adjusting oil inlet valve and oil outlet valve and open and close, realize the adjustment to engine compression ratio, make engine realize best performance match in full working condition.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a variable compression ratio piston adjustment system, engine, and ship. Background Technology

[0002] With the rapid development of the global shipping industry and increasingly stringent environmental regulations, controlling ship operating costs has become a core concern for shipowners. As a key component of the ship's propulsion system, the performance of low-speed diesel engines directly affects the ship's economy and reliability. In the current shipping market environment, how to further improve engine thermal efficiency, reduce fuel consumption, and ensure stable engine operation under various conditions has become an important direction for engine technology development.

[0003] Compression ratio, as a core design parameter of an engine, is closely related to its thermal efficiency and operating performance. Traditional marine low-speed engines generally adopt a fixed compression ratio design. This design approach presents a significant technical contradiction in practical applications: when the engine uses a higher compression ratio, although it can achieve better combustion efficiency under low-load conditions and effectively reduce fuel consumption, it is prone to knocking under high-load conditions, which seriously affects the engine's operational stability and service life. Conversely, if a lower compression ratio is used to ensure stability under high-load conditions, it will lead to a decrease in combustion efficiency and an increase in fuel consumption under low load conditions.

[0004] This fixed compression ratio design proves inadequate in handling the complex and varied operating conditions of marine engines, failing to achieve optimal performance across the entire engine operating range. Especially in modern ship operations, where engines frequently need to cope with different load variations and sea conditions, the limitations of a fixed compression ratio become even more pronounced, becoming a technical bottleneck restricting the overall performance improvement of the engine.

[0005] Therefore, a variable compression ratio piston adjustment system is urgently needed to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a variable compression ratio piston adjustment system, engine, and ship to solve the problem that existing ship engines are inadequate under complex and variable operating conditions and cannot achieve optimal performance matching across the entire operating range of the engine.

[0007] On the one hand, this utility model provides a variable compression ratio piston adjustment system, which includes:

[0008] At least one piston assembly, the piston assembly including a crosshead and a piston rod, the crosshead being provided with a hydraulic chamber, one end of the piston rod being inserted into the hydraulic chamber and slidingly engaged with the crosshead, and the crosshead being provided with an oil inlet and an oil outlet communicating with the hydraulic chamber;

[0009] The regulating assembly includes a hydraulic oil tank, a hydraulic pump, an inlet valve, and an outlet valve. The outlet of the hydraulic oil tank, the inlet of the hydraulic pump, and the inlet of the inlet valve are connected in series. The outlet of the inlet valve is connected to the inlet of the hydraulic chamber. The outlet of the outlet valve is connected to the return port of the hydraulic oil tank. The inlet of the outlet valve is connected to the outlet of the hydraulic chamber.

[0010] As a preferred technical solution for the variable compression ratio piston adjustment system, the adjustment component further includes a one-way valve, through which the oil flowing out of the oil outlet valve flows to the hydraulic chamber.

[0011] As a preferred technical solution for the variable compression ratio piston adjustment system, the adjustment component further includes an overflow valve, the oil inlet of which is connected to the pipeline between the oil inlet valve and the check valve, and the oil outlet of which is connected to the return port of the hydraulic oil tank.

[0012] As a preferred technical solution for a variable compression ratio piston adjustment system, the oil inlet valve is a proportional valve;

[0013] And / or the oil outlet valve is a proportional valve.

[0014] As a preferred technical solution for a variable compression ratio piston adjustment system, the liquid pump is a variable frequency servo liquid pump.

[0015] As a preferred technical solution for the variable compression ratio piston adjustment system, the piston assembly further includes a position sensor, which is used to monitor the real-time extension of the piston rod from the hydraulic chamber.

[0016] As a preferred technical solution for the variable compression ratio piston adjustment system, the piston assembly further includes a piston, which is disposed at the other end of the piston rod and slidably disposed within the cylinder liner;

[0017] The position sensor is installed on the cylinder liner and is used to monitor the real-time position changes of the piston.

[0018] As a preferred technical solution for the variable compression ratio piston adjustment system, the crosshead further includes a sliding hole communicating with the hydraulic chamber, and one end of the piston rod passes through the sliding hole and extends into the hydraulic chamber;

[0019] The piston assembly also includes a reset elastic element (14) that always causes one end of the piston rod to have a tendency to move away from the sliding hole.

[0020] The variable compression ratio piston adjustment system provided by this utility model has at least the following beneficial effects:

[0021] The variable compression ratio piston adjustment system includes an adjustment assembly and at least one piston assembly. The piston assembly includes a crosshead and a piston rod. The crosshead has a hydraulic chamber, and one end of the piston rod is inserted into the hydraulic chamber and slides relative to the crosshead. The crosshead has an inlet and an outlet communicating with the hydraulic chamber. The adjustment assembly includes a hydraulic tank, a pump, an inlet valve, and an outlet valve. The outlet of the hydraulic tank, the inlet of the pump, and the inlet of the inlet valve are connected in series. The outlet of the inlet valve communicates with the inlet of the hydraulic chamber, the outlet of the outlet valve communicates with the return port of the hydraulic tank, and the inlet of the outlet valve communicates with the outlet of the hydraulic chamber. When the pump operates, it draws oil from the hydraulic tank and drives the oil to circulate among the inlet valve, the hydraulic chamber, the outlet valve, the hydraulic tank, and the pump. During this process, by adjusting the opening and closing of the inlet and outlet valves, the amount of oil in the hydraulic chamber can be adjusted, thereby controlling the length of the piston rod extending from the hydraulic chamber. This allows for adjustment of the engine's compression ratio, enabling optimal performance matching across the entire operating range.

[0022] On the other hand, this utility model provides an engine, including at least one cylinder liner, at least one pushrod, a crankshaft, and a variable compression ratio piston adjustment system as described in any of the above-mentioned embodiments. The at least one cylinder liner, at least one pushrod, and at least one of the piston assemblies correspond one-to-one. The piston at the other end of the piston rod is slidably disposed within the cylinder liner. One end of the pushrod is connected to the crosshead, and the other end of the pushrod is connected to the crankshaft pin. It includes a variable compression ratio piston adjustment system as described in any of the above-mentioned embodiments.

[0023] The engine provided by this utility model has at least the following beneficial effects:

[0024] This engine can adjust the compression ratio within each cylinder liner through a variable compression ratio piston adjustment system, thereby enabling the engine to achieve optimal performance matching across the entire operating range.

[0025] On the other hand, this utility model provides a ship that includes the engine of any of the above-mentioned embodiments.

[0026] The engine provided by this utility model has at least the following beneficial effects:

[0027] This vessel's engine can adjust the compression ratio within each cylinder liner through a variable compression ratio piston adjustment system, thereby achieving optimal performance matching across the entire operating range. This ensures the vessel maintains high power performance under varying loads and sea conditions. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the variable compression ratio piston adjustment system in an embodiment of this utility model.

[0029] In the picture:

[0030] 1. Piston assembly; 11. Crosshead; 111. Hydraulic chamber; 1111. First chamber; 1112. Second chamber; 112. Sliding hole; 12. Piston rod; 121. Rod part; 122. Piston part; 13. Position sensor; 14. Reset elastic element; 15. Piston;

[0031] 21. Hydraulic oil tank; 22. Hydraulic pump; 23. Inlet valve; 24. Outlet valve; 25. Check valve; 26. Relief valve;

[0032] 3. Cylinder liner; 4. Controller. Detailed Implementation

[0033] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] like Figure 1 As shown, this embodiment provides a variable compression ratio piston adjustment system. The variable compression ratio piston adjustment system includes an adjustment component and at least one piston assembly 1. The piston assembly 1 includes a crosshead 11 and a piston rod 12. The crosshead 11 is provided with a hydraulic chamber 111. One end of the piston rod 12 is inserted into the hydraulic chamber 111 and slides relative to the crosshead 11. The crosshead 11 is provided with an oil inlet and an oil outlet communicating with the hydraulic chamber 111. The adjustment component includes a hydraulic oil tank 21, a hydraulic pump 22, an oil inlet valve 23, and an oil outlet valve 24. The oil outlet of the hydraulic oil tank 21, the oil inlet of the hydraulic pump 22, and the oil inlet of the oil inlet valve 23 are connected in series. The oil outlet of the oil inlet valve 23 is connected to the oil inlet of the hydraulic chamber 111. The oil outlet of the oil outlet valve 24 is connected to the oil return port of the hydraulic oil tank 21. The oil inlet of the oil outlet valve 24 is connected to the oil outlet of the hydraulic chamber 111. When the hydraulic pump 22 operates, it draws hydraulic fluid from the hydraulic oil tank 21 and drives the fluid to circulate between the inlet valve 23, the hydraulic chamber 111, the outlet valve 24, the hydraulic oil tank 21, and the pump 22. During this process, by adjusting the opening and closing of the inlet valve 23 and the outlet valve 24, the amount of hydraulic fluid in the hydraulic chamber 111 can be adjusted, thereby controlling the length of the piston rod 12 extending from the hydraulic chamber 111. This allows for the adjustment of the engine's compression ratio, enabling the engine to achieve optimal performance matching across its entire operating range.

[0038] When there is one piston assembly 1, the oil outlet of the inlet valve 23 is connected in series with the oil inlet of the hydraulic chamber 111, and the oil inlet of the outlet valve 24 is connected in series with the oil outlet of the hydraulic chamber 111. When there are at least two piston assemblies 1, the oil outlet of the inlet valve 23 is connected in parallel with the oil inlets of at least two hydraulic chambers 111, and the oil inlet of the outlet valve 24 is connected in parallel with the oil outlet of at least two hydraulic chambers 111.

[0039] Optionally, the regulating assembly also includes a one-way valve 25, through which the oil flowing from the outlet valve 24 flows to the hydraulic chamber 111. In this embodiment, when the piston 15 is in the compression stroke, the one-way valve 25 can prevent the oil in the hydraulic chamber 111 from flowing back and damaging the hydraulic pump 22.

[0040] Optionally, the regulating assembly also includes a relief valve 26. The inlet of the relief valve 26 is connected to the pipeline between the inlet valve 23 and the check valve 25, and the outlet of the relief valve 26 is connected to the return port of the hydraulic oil tank 21. In this embodiment, when the oil pressure between the hydraulic pump 22 and the check valve 25 is too high, it can easily damage the pipeline between the hydraulic pump 22 and the check valve 25, as well as the hydraulic pump 22. Therefore, when the pressure in the pipeline between the hydraulic pump 22 and the check valve 25 is greater than the preset value of the relief valve 26, the relief valve 26 is connected, thereby returning part of the oil between the hydraulic pump 22 and the check valve 25 to the hydraulic oil tank 21, preventing damage to the pipeline between the hydraulic pump 22 and the check valve 25, as well as to the hydraulic pump 22, due to excessive pressure.

[0041] Optionally, the inlet valve 23 is a proportional valve; the outlet valve 24 is a proportional valve. In this embodiment, by adjusting the opening ratio of the inlet valve 23 and the opening ratio of the outlet valve 24, a flow difference is created between the inlet and outlet of the hydraulic chamber 111, thereby achieving the extension and retraction of the piston rod 12 relative to the crosshead 11.

[0042] In other embodiments, only the inlet valve 23 may be a proportional valve, or only the outlet valve 24 may be a proportional valve.

[0043] For example, when the opening ratio of the inlet valve 23 is greater than the opening ratio of the outlet valve 24, the volume of oil in the hydraulic chamber 111 gradually increases, thereby driving the piston rod 12 to extend out of the crosshead 11. When the opening ratio of the inlet valve 23 is less than the opening ratio of the outlet valve 24, the volume of oil in the hydraulic chamber 111 gradually decreases, thereby driving the piston rod 12 to retract into the crosshead 11. When the opening ratio of the inlet valve 23 is equal to the opening ratio of the outlet valve 24, the volume of oil in the hydraulic chamber 111 remains unchanged, and the piston rod 12 remains stationary relative to the crosshead 11.

[0044] Optionally, the hydraulic pump 22 is a variable frequency servo hydraulic pump 22. In this embodiment, the working curve of the variable frequency servo hydraulic pump 22 is calibrated according to the optimal compression ratio requirements of the engine under various loads, so as to realize the change of the oil supply pressure of the hydraulic pump 22. By supplying oil at the corresponding pressure into the hydraulic chamber 111, and by coordinating the adjustment of the inlet valve 23 and the outlet valve 24, the piston rod 12 is raised or lowered, thereby realizing the adjustment of the compression ratio of the marine low-speed engine.

[0045] Optionally, the piston assembly 1 further includes a position sensor 13, which monitors the real-time extension of the piston rod 12 from the hydraulic chamber 111. In this embodiment, the real-time extension of the piston rod 12 from the hydraulic chamber 111 monitored by the position sensor 13 serves as the basis for the coordinated adjustment of the inlet valve 23 and the outlet valve 24, thereby achieving the adjustment of the inlet valve 23 and the outlet valve 24.

[0046] Optionally, the piston assembly 1 further includes a piston 15, which is disposed at the other end of the piston rod 12 and slidably disposed within the cylinder liner 3; a position sensor 13 is disposed in the cylinder liner 3 and is used to monitor the real-time position change of the piston 15. In this embodiment, by monitoring the position change of the piston 15 when it is at its lowest or highest point by the position sensor 13, the extension amount of the piston rod 12 relative to the crosshead 11 can be obtained.

[0047] Optionally, the crosshead 11 also includes a sliding hole 112 communicating with the hydraulic chamber 111, and one end of the piston rod 12 passes through the sliding hole 112 and extends into the hydraulic chamber 111; the piston assembly 1 also includes a reset elastic element 14, which always makes one end of the piston rod 12 tend to move away from the sliding hole 112. In this embodiment, the piston rod 12 includes a piston portion 122 and a rod portion 121 fixedly connected to the piston portion 122. The piston portion 122 is slidably disposed within the hydraulic chamber 111 and divides the hydraulic chamber 111 into two independent chambers 1111 and 1112. The oil inlet and outlet of the hydraulic chamber 111 are both connected to the first chamber 1111, and the sliding hole 112 is connected to the second chamber 1112. One end of the rod portion 121 extends into the sliding hole 112 and is fixedly connected to the piston portion 122. A reset elastic member 14 is sleeved on the rod portion 121 and abuts against the walls of the piston portion 122 and the sliding hole 112, respectively, so that one end of the piston rod 12 always has a tendency to move away from the sliding hole 112. This arrangement allows the piston rod 12 to move stably relative to the crosshead 11.

[0048] Optionally, the reset elastic element 14 is a helical spring.

[0049] Optionally, the variable compression ratio piston adjustment system also includes a controller 4, which is communicatively connected to the oil outlet valve 24, the oil inlet valve 23, the hydraulic pump 22, and the position sensor 13.

[0050] This embodiment also provides an engine, including at least one cylinder liner 3, at least one pushrod, a crankshaft, and the variable compression ratio piston adjustment system described above. The at least one cylinder liner 3, at least one pushrod, and at least one piston assembly 1 correspond one-to-one. The piston 15 at the other end of the piston rod 12 is slidably disposed within the cylinder liner 3. One end of the pushrod is connected to a crosshead 11, and the other end of the pushrod is connected to a crankshaft pin. This engine can adjust the compression ratio within each cylinder liner 3 through the variable compression ratio piston adjustment system, thereby enabling the engine to achieve optimal performance matching across the entire operating range.

[0051] This embodiment also provides a vessel, including the engine described above. The engine can adjust the compression ratio within each cylinder liner 3 through a variable compression ratio piston adjustment system, thereby enabling the engine to achieve optimal performance matching across the entire operating range. This allows the vessel to maintain high power performance under varying loads and sea conditions.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A variable compression ratio piston adjustment system, characterized in that, include: At least one piston assembly (1), the piston assembly (1) includes a crosshead (11) and a piston rod (12), the crosshead (11) is provided with a hydraulic chamber (111), one end of the piston rod (12) is inserted into the hydraulic chamber (111) and slides relative to the crosshead (11), the crosshead (11) is provided with an oil inlet and an oil outlet communicating with the hydraulic chamber (111); The regulating assembly includes a hydraulic oil tank (21), a hydraulic pump (22), an inlet valve (23), and an outlet valve (24). The outlet of the hydraulic oil tank (21), the inlet of the hydraulic pump (22), and the inlet of the inlet valve (23) are connected in series. The outlet of the inlet valve (23) is connected to the inlet of the hydraulic chamber (111). The outlet of the outlet valve (24) is connected to the return port of the hydraulic oil tank (21). The inlet of the outlet valve (24) is connected to the outlet of the hydraulic chamber (111).

2. The variable compression ratio piston adjustment system according to claim 1, characterized in that, The regulating assembly also includes a one-way valve (25) through which the oil flowing from the outlet valve (24) flows to the hydraulic chamber (111).

3. The variable compression ratio piston adjustment system according to claim 2, characterized in that, The regulating assembly also includes an overflow valve (26), the oil inlet of which is connected to the pipeline between the oil inlet valve (23) and the check valve (25), and the oil outlet of the overflow valve (26) is connected to the return port of the hydraulic oil tank (21).

4. The variable compression ratio piston adjustment system according to claim 1, characterized in that, The oil inlet valve (23) is a proportional valve; And / or the oil outlet valve (24) is a proportional valve.

5. The variable compression ratio piston adjustment system according to claim 1, characterized in that, The liquid pump (22) is a variable frequency servo liquid pump (22).

6. The variable compression ratio piston adjustment system according to claim 1, characterized in that, The piston assembly (1) also includes a position sensor (13) for monitoring the real-time extension of the piston rod (12) from the hydraulic chamber (111).

7. The variable compression ratio piston adjustment system according to claim 6, characterized in that, The piston assembly (1) further includes a piston (15), which is disposed at the other end of the piston rod (12) and slidably disposed within the cylinder liner (3); The position sensor (13) is installed on the cylinder liner (3) and is used to monitor the real-time position change of the piston (15).

8. The variable compression ratio piston adjustment system according to claim 1, characterized in that, The crosshead (11) also includes a sliding hole (112) communicating with the hydraulic chamber (111), and one end of the piston rod (12) passes through the sliding hole (112) and extends into the hydraulic chamber (111); The piston assembly (1) also includes a reset elastic element (14), which always causes one end of the piston rod (12) to have a tendency to move away from the sliding hole (112).

9. An engine, characterized in that, The system includes at least one cylinder liner (3), at least one push rod, a crankshaft, and a variable compression ratio piston adjustment system as described in any one of claims 1-8. The at least one cylinder liner (3), at least one push rod, and at least one of the piston assemblies (1) correspond one-to-one. The piston (15) at the other end of the piston rod (12) is slidably disposed within the cylinder liner (3). One end of the push rod is connected to the crosshead (11), and the other end of the push rod is connected to the crankshaft pin of the crankshaft.

10. A ship, characterized in that, Includes the engine as described in claim 9.

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