CN108825372B - Variable combustion chamber volume mechanism of low-speed machine - Google Patents
Variable combustion chamber volume mechanism of low-speed machine Download PDFInfo
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- CN108825372B CN108825372B CN201810678416.7A CN201810678416A CN108825372B CN 108825372 B CN108825372 B CN 108825372B CN 201810678416 A CN201810678416 A CN 201810678416A CN 108825372 B CN108825372 B CN 108825372B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000004044 response Effects 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
A variable combustion chamber volume mechanism of a low-speed machine belongs to the technical field of low-speed machines for ships. The piston pin of the variable combustion chamber volume mechanism is connected to the piston assembly and the crosshead, and the connecting rod pin is connected to the connecting rod small end. The rotation center of the adjusting rocker arm is concentric with the axis of the piston pin, the adjusting rocker arm is circumferentially fixed with the connecting rod pin, and the rotation center of the adjusting rocker arm is not concentric with the axis of the connecting rod pin. The regulating valve has at least four valve ports, and the pressure source is connected to the first valve port via the non-return valve. The variable combustion chamber volume mechanism realizes flexible and variable volume of the combustion chamber of the low-speed machine by controlling the regulating valve; the mechanism is arranged on the reciprocating moving piece, so that the influence of the vibration of the low-speed machine on the variable volume characteristic of the combustion chamber is reduced; the adjusting system consisting of the adjusting valve, the first check valve, the second check valve and the third check valve is adopted to drive the first plunger assembly and the second plunger assembly, the response is quick when the volume of the combustion chamber is adjusted, and the energy consumption for driving the mechanism is low.
Description
Technical Field
The invention relates to a variable combustion chamber volume mechanism of a low-speed machine, and belongs to the technical field of low-speed machines for ships.
Background
The emission regulations of ship engines are becoming stricter, and users demand that the running cost of ships be reduced to the maximum extent. Marine two-stroke low-speed machines used in ships such as ocean going vessels consume a large amount of fuel and emit a large amount of harmful substances every year. For this purpose, advanced technologies such as gas machines, dual fuel machines, miller cycle, etc. are continuously being adopted. The above-mentioned technology requires that the volume of the combustion chamber is always variable in real time in all operating conditions of the low-speed machine, thereby ensuring that the low-speed machine always works with the best performance. At present, a variable combustion chamber volume mechanism is not adopted in a low-speed machine.
Disclosure of Invention
The invention aims to: by designing the variable combustion chamber volume mechanism of the low-speed machine, the variable combustion chamber volume mechanism is used for realizing that: (a) in order to improve the performance of the low-speed machine, the mechanism is required to realize the variable volume of the combustion chamber; (b) in order to reduce the influence of the vibration of the low-speed engine on the variable volume characteristic of the combustion chamber, the structure and the arrangement position of the mechanism must be reasonably designed; (c) in order to meet the responsiveness of the variable operating conditions of the low-speed engine, the mechanism must respond fast enough when adjusting the volume of the combustion chamber; (d) low power consumption is required to drive the mechanism.
The technical scheme adopted by the invention is as follows: a variable combustion chamber volume mechanism of a low-speed machine comprises a piston assembly, a crosshead, a connecting rod, a first plunger assembly, a second plunger assembly, a piston pin, an adjusting rocker arm, a connecting rod pin, an adjusting valve, a first check valve, a second check valve and a third check valve. The piston pin is connected with the piston assembly and the crosshead, and the connecting rod pin is connected with the small end of the connecting rod. The rotation center of the adjusting rocker arm is concentric with the axis of the piston pin, the adjusting rocker arm is circumferentially fixed with the connecting rod pin, and the rotation center of the adjusting rocker arm is not concentric with the axis of the connecting rod pin. The first and second plunger assemblies are mounted on a piston assembly, crosshead, or bracket fixed relative to the piston assembly. The regulating valve at least comprises a first valve port, a second valve port, a third valve port and a fourth valve port. The pressure source is connected with the first valve port through a third one-way valve, the second valve port is connected with the plunger cavity of the first plunger assembly, the fourth valve port is connected with the plunger cavity of the second plunger assembly, the third valve port is connected with the plunger cavity of the first plunger assembly through the first one-way valve, and the third valve port is connected with the plunger cavity of the second plunger assembly through the second one-way valve. The spool of the regulator valve has at least three positions. When the valve core is at the first position, the first valve port, the third valve port and the fourth valve port are connected, and the second valve port is blocked. When the valve core is at the second position, the first valve port is connected with the third valve port, and the second valve port and the fourth valve port are blocked. When the valve core is at the third position, the first valve port, the second valve port and the third valve port are connected, and the fourth valve port is blocked. The first plunger assembly and the second plunger assembly jointly drive the adjusting rocker arm to rotate.
The invention has the beneficial effects that: the piston pin of the variable combustion chamber volume mechanism of the low-speed machine is connected with the piston assembly and the crosshead, and the connecting rod pin is connected with the connecting rod small end. The rotation center of the adjusting rocker arm is concentric with the axis of the piston pin, the adjusting rocker arm is circumferentially fixed with the connecting rod pin, and the rotation center of the adjusting rocker arm is not concentric with the axis of the connecting rod pin. The regulating valve has at least four valve ports, and the pressure source is connected to the first valve port via the non-return valve. The variable combustion chamber volume mechanism realizes flexible and variable volume of the combustion chamber of the low-speed machine by controlling the regulating valve; the mechanism is arranged on the reciprocating moving piece, so that the influence of the vibration of the low-speed machine on the variable volume characteristic of the combustion chamber is reduced; the adjusting system consisting of the adjusting valve, the first check valve, the second check valve and the third check valve is adopted to drive the first plunger assembly and the second plunger assembly, the response is quick when the volume of the combustion chamber is adjusted, and the energy consumption for driving the mechanism is low.
Drawings
The invention is further described with reference to the following figures and examples.
Fig. 1 is a low-speed engine variable combustion chamber volume mechanism.
FIG. 2 is an example of the installation of a piston pin, an adjusting rocker arm, and a connecting rod pin.
In the figure: 1. a first plunger assembly; 2. a second plunger assembly; 3. a piston pin; 4. adjusting the rocker arm; 401. a first plunger drive end; 402. a second plunger drive end; 5. a link pin; 6. adjusting a valve; 7. a first check valve; 8. a second one-way valve; 9. a third check valve; a1, a first valve port; a2, a second valve port; a3, third valve port; a4, fourth port.
Detailed Description
The invention relates to a variable combustion chamber volume mechanism of a low-speed machine, which is shown in a figure 1. The piston type hydraulic cylinder comprises a piston assembly, a crosshead, a connecting rod, a first plunger assembly 1, a second plunger assembly 2, a piston pin 3, an adjusting rocker arm 4, a connecting rod pin 5, an adjusting valve 6, a first check valve 7, a second check valve 8 and a third check valve 9. The piston pin 3 is connected to the piston assembly and the crosshead. The link pin 5 is connected with the link small end. The rotation center of the adjusting rocker arm 4 is concentric with the axis of the piston pin 3, the adjusting rocker arm 4 is circumferentially fixed with the connecting rod pin 5, and the rotation center of the adjusting rocker arm 4 is not concentric with the axis of the connecting rod pin 5. The first plunger assembly 1 and the second plunger assembly 2 are mounted on a piston assembly, crosshead or a carriage fixed relative to the piston assembly. The first plunger assembly 1 and the second plunger assembly 2 drive the adjusting rocker arm 4 to rotate together. When the adjusting rocker arm 4 rotates, the distance between the piston assembly and the crosshead relative to the axle center of the small end of the connecting rod is changed, and the change of the volume of the combustion chamber of the low-speed engine is realized.
FIG. 2 is an example of the installation of a piston pin, an adjusting rocker arm, and a connecting rod pin. The adjusting rocker arm 4 is fixedly connected with the connecting rod pin 5, the rotation center of the adjusting rocker arm 4 is concentric with the axis of the piston pin 3, and the axis of the connecting rod pin 5 is not concentric with the axis of the piston pin 3. The first plunger assembly 1 and the second plunger assembly 2 drive the adjusting rocker arm 4 to rotate by the first plunger driving end 401 and the second plunger driving end 402, respectively, thereby adjusting the phase of the axis of the link pin 5 with respect to the axis of the piston pin 3.
The regulator valve 6 has at least a first port A1, a second port A2, a third port A3, and a fourth port A4. The pressure source is connected with the first valve port A1 through the third check valve 9, the second valve port A2 is connected with the plunger cavity of the first plunger assembly 1, the fourth valve port A4 is connected with the plunger cavity of the second plunger assembly 2, the third valve port A3 is connected with the plunger cavity of the first plunger assembly 1 through the first check valve 7, and the third valve port A3 is connected with the plunger cavity of the second plunger assembly 2 through the second check valve 8. The valve spool of the regulating valve 6 has at least three positions. When the valve core is at the first position, the first valve port A1, the third valve port A3 and the fourth valve port A4 are connected, and the second valve port A2 is blocked. When the valve spool is in the second position, the first port A1 is connected to the third port A3, and both the second port A2 and the fourth port A4 are blocked. When the valve core is at the third position, the first port A1, the second port A2 and the third port A3 are connected, and the fourth port A4 is blocked.
When the volume of the combustion chamber of the low-speed engine does not need to be adjusted, the valve core of the control adjusting valve 6 is located at the second position, after the pressure source passes through the third one-way valve 9, working media are respectively supplemented for the plunger cavity of the first plunger assembly 1 through the first one-way valve 7, and working media are supplemented for the plunger cavity of the second plunger assembly 2 through the second one-way valve 8. The adjusting rocker arm 4 does not rotate.
When the volume of the combustion chamber of the low-speed engine needs to be adjusted, the rotating direction needed by the adjusting rocker arm 4 is judged according to the current position of the adjusting rocker arm 4, the working condition of the low-speed engine and the like. When the rocker arm 4 needs to be adjusted to rotate anticlockwise, the valve core of the adjusting valve 6 is controlled to be at the first position, the acting force transmitted to the first plunger assembly 1 and the second plunger assembly 2 through the adjusting rocker arm 4 by using a connecting rod and other components is utilized, working medium in the plunger cavity of the second plunger assembly 2 flows to the plunger cavity of the first plunger assembly 1 through the fourth valve port A4, the third valve port A3 and the first check valve 7 of the adjusting valve 6, and the anticlockwise rotation of the adjusting rocker arm 4 is achieved. When the rocker arm 4 needs to be adjusted to rotate clockwise, the valve core of the adjusting valve 6 is controlled to be in the third position, acting forces transmitted to the first plunger assembly 1 and the second plunger assembly 2 through the adjusting rocker arm 4 by using components such as a connecting rod and the like are utilized, working media in the plunger cavity of the first plunger assembly 1 flow to the plunger cavity of the second plunger assembly 2 through the second valve port A2, the third valve port A3 and the second check valve 8 of the adjusting valve 6, and the clockwise rotation of the adjusting rocker arm 4 is realized. During the regulation phase, the pressure source replenishes the plunger chambers of the first plunger assembly 1 and the second plunger assembly 2 with working fluid via the third check valve 9.
Because this mechanism utilizes parts such as connecting rod to transmit the effort of first plunger subassembly 1 and second plunger subassembly 2 through adjusting rocking arm 4, the case position of cooperation governing valve, flow direction and working medium volume between the plunger chamber of first plunger subassembly 1 and the plunger chamber of second plunger subassembly 2 have been controlled and the combustion chamber volume has been adjusted, in whole regulation stage, working medium only flows between the plunger chamber of first plunger subassembly 1 and the plunger chamber of second plunger subassembly 2, the pressure source only need supply loss such as working medium reveals. Therefore, the mechanism has quick response and extremely low energy consumption. In addition, the mechanism is arranged on the reciprocating element, and the influence of low-speed machine vibration on the variable volume characteristic of the combustion chamber is greatly reduced.
Claims (1)
1. A variable combustion chamber volume mechanism of a low-speed machine comprises a piston assembly, a crosshead and a connecting rod, and further comprises a first plunger assembly (1), a second plunger assembly (2), a piston pin (3), an adjusting rocker arm (4), a connecting rod pin (5), an adjusting valve (6), a first check valve (7), a second check valve (8) and a third check valve (9); the piston pin (3) is connected with the piston assembly and the crosshead; the connecting rod pin (5) is connected with the small end of the connecting rod; the rotation center of the adjusting rocker arm (4) is concentric with the axis of the piston pin (3), the adjusting rocker arm (4) is circumferentially fixed with the connecting rod pin (5), and the rotation center of the adjusting rocker arm (4) is not concentric with the axis of the connecting rod pin (5); the first plunger assembly (1) and the second plunger assembly (2) are arranged on a piston assembly, a crosshead or a bracket fixed relative to the piston assembly; the regulating valve (6) at least comprises a first valve port (A1), a second valve port (A2), a third valve port (A3) and a fourth valve port (A4); the pressure source is connected with a first valve port (A1) through a third check valve (9), a second valve port (A2) is connected with a plunger cavity of the first plunger assembly (1), a fourth valve port (A4) is connected with a plunger cavity of the second plunger assembly (2), a third valve port (A3) is connected with the plunger cavity of the first plunger assembly (1) through a first check valve (7), and a third valve port (A3) is connected with the plunger cavity of the second plunger assembly (2) through a second check valve (8); the method is characterized in that: the first plunger assembly (1) and the second plunger assembly (2) drive the adjusting rocker arm (4) to rotate through a first plunger driving end (401) and a second plunger driving end (402) respectively, so that the phase of the axis of the connecting rod pin (5) relative to the axis of the piston pin (3) is adjusted; the valve core of the regulating valve (6) has at least three positions; when the valve core is at the first position, the first valve port (A1), the third valve port (A3) and the fourth valve port (A4) are connected, and the second valve port (A2) is blocked; when the valve core is at the second position, the first valve port (A1) is connected with the third valve port (A3), and the second valve port (A2) and the fourth valve port (A4) are blocked; when the valve core is at the third position, the first valve port (A1), the second valve port (A2) and the third valve port (A3) are connected, and the fourth valve port (A4) is blocked; the first plunger assembly (1) and the second plunger assembly (2) jointly drive the adjusting rocker arm (4) to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810678416.7A CN108825372B (en) | 2018-06-27 | 2018-06-27 | Variable combustion chamber volume mechanism of low-speed machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810678416.7A CN108825372B (en) | 2018-06-27 | 2018-06-27 | Variable combustion chamber volume mechanism of low-speed machine |
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| Publication Number | Publication Date |
|---|---|
| CN108825372A CN108825372A (en) | 2018-11-16 |
| CN108825372B true CN108825372B (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810678416.7A Active CN108825372B (en) | 2018-06-27 | 2018-06-27 | Variable combustion chamber volume mechanism of low-speed machine |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4096700B2 (en) * | 2002-11-05 | 2008-06-04 | 日産自動車株式会社 | Variable compression ratio device for internal combustion engine |
| JP6283687B2 (en) * | 2012-12-21 | 2018-02-21 | ボーグワーナー インコーポレーテッド | Variable compression ratio piston system |
| JP2016118277A (en) * | 2014-12-22 | 2016-06-30 | トヨタ自動車株式会社 | Variable-length connecting rod and variable compression ratio internal combustion engine |
| DE102015111273A1 (en) * | 2015-03-27 | 2016-09-29 | Hilite Germany Gmbh | Hydraulic valve and connecting rod with a hydraulic valve |
| JP6365570B2 (en) * | 2016-02-29 | 2018-08-01 | トヨタ自動車株式会社 | Variable length connecting rod and variable compression ratio internal combustion engine |
| DE102016117875A1 (en) * | 2016-03-16 | 2017-09-21 | Hilite Germany Gmbh | Connecting rod for an internal combustion engine with variable compression with an eccentric adjustment |
| CN205477932U (en) * | 2016-03-16 | 2016-08-17 | 吉林大学 | Hydraulic drive formula variable compression ratio piston link assembly |
| DE102017113984A1 (en) * | 2016-09-30 | 2018-04-05 | ECO Holding 1 GmbH | Hydraulic arrangement with a switching valve for controlling a hydraulic fluid flow of a connecting rod for a variable compression internal combustion engine and connecting rods |
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| CN108825372A (en) | 2018-11-16 |
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