CN211008931U - Medium speed diesel engine fuel common rail system - Google Patents
Medium speed diesel engine fuel common rail system Download PDFInfo
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- CN211008931U CN211008931U CN201921622013.7U CN201921622013U CN211008931U CN 211008931 U CN211008931 U CN 211008931U CN 201921622013 U CN201921622013 U CN 201921622013U CN 211008931 U CN211008931 U CN 211008931U
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Abstract
The utility model discloses a medium speed diesel engine fuel common rail system, including installing in the high pressure fuel pump bracket of engine organism side, the sprayer on servo oil pump and each jar, the servo oil pump of installing on high pressure fuel pump bracket includes first servo oil pump and the servo oil pump of second, first servo oil pump and the servo oil pump of second are connected to the connecting block assembly, the output of connecting block assembly supplies oil pipe connection to the oil spout pipe of each jar through the high pressure, and through the pipe polyphone intercommunication that altogether rail between the sprayer of each jar, and through valve joint connection overflow valve on the oil spout pipe of last cylinder. The fuel oil is output through the two servo oil pumps with smaller volumes, the high-pressure fuel oil is stably conveyed by using the connecting block assembly and the common rail pipe and can be supplied to each cylinder of oil injectors, so that the fuel oil with good atomization quality is obtained in the combustion chamber, and the diesel engine outputs higher power.
Description
Technical Field
The utility model relates to a diesel engine fuel feeding technique especially relates to a medium speed diesel engine fuel common rail system.
Background
When the diesel engine works, the fuel oil in the combustion chamber and the air entering the combustion chamber form combustible mixed gas in the combustion chamber, and the combustible mixed gas is ignited by the high temperature generated by the upward compression of the piston in the cylinder to expand to do work to push the piston to move up and down to drive the crank machine to do rotary motion to output power. Therefore, to achieve a high output power, good conditions for the combustion process are created from both the air and fuel aspects, i.e. a certain amount of fuel is injected into the cylinder in time, and the fuel injected into the cylinder must be in the form of a fine mist to achieve good mixing with the air in the combustion chamber.
The main factors affecting fuel atomization are fuel injection pressure, injector orifice diameter, and fuel viscosity. When the injection pressure is increased, the atomization quality is improved, and therefore the injection pressure is increased by increasing the fuel pressure, so that good atomization quality is obtained.
The existing pressure increasing and stabilizing technology mainly adopts the technology of improving the pumping pressure capacity of an oil pump and a high-pressure common rail, the adoption of a high-power oil pump and a common rail in a small and medium-sized engine is relatively easy to realize, for ships and the like needing large and medium-sized diesel engines, the matched high-power oil pump is unrealistic, and the matched common rail and an oil pump body are too large in size and are not suitable for the installation requirement of a compact environment.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a medium speed diesel engine fuel common rail system.
The design principle is as follows: a high-pressure fuel system with stable space and pressure supply is designed, high-pressure fuel is output through pressurization of two-stage smaller servo oil pumps, the high-pressure fuel can be supplied to each cylinder oil injector through high-pressure oil pipes which are communicated in series, the communicated high-pressure oil pipes form a common rail system, stable high-pressure fuel supply is guaranteed, and good atomized fuel is obtained.
The purpose of the utility model is realized by adopting the following technical scheme:
the utility model provides a medium speed diesel engine fuel common rail system, is including installing the sprayer on high-pressure fuel pump bracket, the servo oil pump and each jar of engine organism side, installs servo oil pump on the high-pressure fuel pump bracket includes first servo oil pump and the servo oil pump of second, and the system is still including installing connecting block assembly on the high-pressure fuel pump bracket, first servo oil pump and the servo oil pump of second are connected to the connecting block assembly, the output of connecting block assembly supplies oil pipe connection to the oil spout pipe of each jar through the high pressure, and establishes ties the intercommunication through the common rail pipe between the sprayer of each jar to through valve joint connection overflow valve on the oil spout pipe of last cylinder.
Preferably, the output end of the first servo oil pump is connected to the connecting block assembly through a first high-pressure oil pipe, and the output end of the second servo oil pump is connected to the connecting block assembly through a second high-pressure oil pipe.
Preferably, the output end of the first servo oil pump is connected to the second servo oil pump through a first high-pressure oil pipe, and the output end of the second servo oil pump is connected to the connecting block assembly through a second high-pressure oil pipe.
Preferably, two external thread holes for connection of the common rail pipe are formed in the outer end pipe body of the oil injection guide pipe, two unthreaded holes for fastening connection are formed in the inner end pipe body of the oil injection guide pipe, the sleeve is sleeved at the unthreaded hole of the oil injection guide pipe, the oil injection guide pipe is fixed to the sleeve through a guide pipe fixing bolt at one unthreaded hole, and the sleeve is fastened to the cylinder cover through a sleeve bolt at the other unthreaded hole.
Preferably, for the V-type diesel engine, the high-pressure oil supply pipes comprise an a-row high-pressure oil supply pipe and a B-row high-pressure oil supply pipe, the a-row high-pressure oil supply pipe supplies oil to an a exhaust cylinder of the V-type diesel engine, and the B-row high-pressure oil supply pipe supplies oil to a B exhaust cylinder of the V-type diesel engine.
Preferably, the connecting block assembly is fixed on the high-pressure fuel pump bracket through an assembly fixing bolt.
Preferably, the side surface and the top surface of the connecting block assembly are respectively provided with a connecting hole, the connecting hole on the side surface is used for connecting the first high-pressure oil pipe and the second high-pressure oil pipe, and the connecting hole on the top surface is used for connecting the high-pressure oil supply pipe; and four mounting holes are respectively formed in four corners of the connecting block assembly, and four assembly fixing bolts penetrate through the mounting holes to fasten the connecting block assembly to the side face of the high-pressure fuel pump bracket.
Preferably, the sleeve is provided with two holes in its upper part for connection to the injection conduit and two holes in its lower part for connection to the cylinder head.
Preferably, the valve joint comprises a small end thread and a large end thread, the small end thread is matched with an external thread of the oil injection conduit, and the large end thread is matched with a mounting thread of the overflow valve.
Compared with the prior art, the beneficial effects of the utility model reside in that: the fuel oil is output through the two servo oil pumps with smaller volumes, the high-pressure fuel oil is stably conveyed by using the connecting block assembly and the common rail pipe and can be supplied to each cylinder of oil injectors, so that the fuel oil with good atomization quality is obtained in the combustion chamber, and the diesel engine outputs higher power.
Drawings
FIG. 1 is an end elevational view of a fuel common rail system assembled on a diesel engine;
FIG. 2 is a top view of a fuel common rail system assembled on a diesel engine;
FIG. 3 is an assembly view of the junction block assembly and the high pressure tubing;
fig. 4 shows a schematic view of the assembly of the injection line.
In the figure: 1. a connecting block assembly; 2. a first high pressure fuel line; 3. a second high pressure fuel line; 4. a first servo oil pump; 5. a second servo oil pump; 6. a, arranging high-pressure oil pipes; 7. b, discharging high-pressure oil pipes; 8. an oil injection conduit; 9. a common rail pipe; 10. an oil injector; 11. a valve joint; 12. an overflow valve; 13. a high pressure fuel pump bracket; 14. an assembly fixing bolt; 15. a catheter fixing bolt; 16. a sleeve; 17. a sleeve bolt; 18. and a cylinder head.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
A fuel common rail system of a medium-speed diesel engine is disclosed, referring to fig. 1-4, and comprises a connecting block assembly 1, a first high-pressure fuel pipe 2, a second high-pressure fuel pipe 3, a first servo oil pump 4, a second servo oil pump 5, an A-row high-pressure fuel pipe 6, a B-row high-pressure fuel pipe 7, an oil injection guide pipe 8, a common rail pipe 9, an oil injector 10, a valve joint 11, an overflow valve 12 and a high-pressure fuel pump bracket 13.
Connection relation: a high-pressure fuel pump bracket 13 is arranged at the side end of an engine body, servo oil pumps (4 and 5) are arranged on the high-pressure fuel pump bracket 13, and a connecting block assembly 1 is arranged on the upper portion of the high-pressure fuel pump bracket 13. The first servo oil pump 4 and the second servo oil pump 5 are connected to the connecting block assembly 1, the output end of the connecting block assembly 1 is connected to the oil injection guide pipe 8 of each cylinder through high-pressure oil supply pipes (6, 7), the oil injectors 10 of each cylinder are communicated in series through a common rail pipe 9, and the oil injection guide pipe 8 of the last cylinder is connected with an overflow valve 12 through a valve connector 11.
Wherein, the connecting block assembly 1 is fixed on the high-pressure fuel pump bracket 13 through an assembly fixing bolt 14. Connecting holes are respectively formed in the side surface and the top surface of the connecting block assembly 1, the connecting holes in the side surface are used for connecting the first high-pressure oil pipe 2 and the second high-pressure oil pipe 3, and the connecting holes in the top surface are used for connecting the high-pressure oil supply pipes (6 and 7); four mounting holes are respectively formed in four corners of the connecting block assembly 1, and four assembly fixing bolts 14 penetrate through the mounting holes to fasten the connecting block assembly 1 to the side face of the high-pressure fuel pump bracket 13.
Furthermore, two external thread holes for connection of the common rail pipe 9 are formed in the outer end pipe body of the oil injection guide pipe 8, two unthreaded holes for fastening connection are formed in the inner end pipe body of the oil injection guide pipe 8, the sleeve 16 is sleeved at the unthreaded hole of the oil injection guide pipe 8, the oil injection guide pipe 8 is fixed to the sleeve 16 through a guide pipe fixing bolt 15 at one unthreaded hole, and the sleeve 16 is fastened to the cylinder cover through a sleeve bolt 17 at the other unthreaded hole.
And the valve joint 11 comprises a small end thread and a large end thread, the small end thread is matched with the external thread of the oil injection conduit 8, and the large end thread is matched with the mounting thread of the overflow valve 12.
The sleeve 16 is provided with two holes in its upper part for connection to the injection conduit 8 and two holes in its lower part for connection to the cylinder head 18.
The arrangement relation of the servo oil pumps can be in parallel connection or in series connection, the two parallel oil supplies increase the total number of the servo oil pumps in unit time, specifically, the output end of a first servo oil pump 4 is connected to the connecting block assembly 1 through a first high-pressure oil pipe 2, and the output end of a second servo oil pump 5 is connected to the connecting block assembly 1 through a second high-pressure oil pipe 3; for a serial oil supply mode, two-stage pressurization can be realized, and the oil supply pressure is increased, specifically, the output end of the first servo oil pump 4 is connected to the second servo oil pump 5 through the first high-pressure oil pipe 2, and the output end of the second servo oil pump 5 is connected to the connecting block assembly 1 through the second high-pressure oil pipe 3.
The fuel common rail system is suitable for both a straight diesel engine and a V-type diesel engine.
For an inline diesel engine (not shown), the high pressure oil supply pipe includes only one inline high pressure oil supply pipe through which oil is supplied to each cylinder.
For the V-shaped diesel engine, the high-pressure oil supply pipe comprises an A-row high-pressure oil pipe 6 and a B-row high-pressure oil pipe 7, the A-row high-pressure oil pipe 6 supplies oil to an A exhaust cylinder of the V-shaped diesel engine, and the B-row high-pressure oil pipe 7 supplies oil to a B exhaust cylinder of the V-shaped diesel engine.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. The utility model provides a medium speed diesel engine fuel common rail system, is including installing in high-pressure fuel pump bracket (13), servo oil pump (4, 5) and sprayer (10) on each jar of engine organism side, its characterized in that: install servo oil pump (4, 5) on high-pressure fuel pump bracket (13) include first servo oil pump (4) and second servo oil pump (5), and the system is still including installing connecting block assembly (1) on high-pressure fuel pump bracket (13), first servo oil pump (4) and second servo oil pump (5) are connected to connecting block assembly (1), the output of connecting block assembly (1) is connected to the oil spout pipe (8) of each jar through high-pressure fuel feed pipe (6, 7), and establishes ties the intercommunication through common rail pipe (9) between oil sprayer (10) of each jar to connect overflow valve (12) through valve joint (11) on oil spout pipe (8) of last cylinder.
2. The fuel common rail system according to claim 1, wherein: the output end of the first servo oil pump (4) is connected to the connecting block assembly (1) through a first high-pressure oil pipe (2), and the output end of the second servo oil pump (5) is connected to the connecting block assembly (1) through a second high-pressure oil pipe (3).
3. The fuel common rail system according to claim 1, wherein: the output end of the first servo oil pump (4) is connected to the second servo oil pump (5) through the first high-pressure oil pipe (2), and the output end of the second servo oil pump (5) is connected to the connecting block assembly (1) through the second high-pressure oil pipe (3).
4. A fuel common rail system according to claim 2 or 3, characterized in that: offer two outer screw holes that are used for common rail pipe (9) to connect on the outer end body of oil spout pipe (8), offer two unthreaded holes that are used for the fastening connection usefulness on the inner body of oil spout pipe (8), cup joint sleeve (16) in the unthreaded hole department of oil spout pipe (8), fix oil spout pipe (8) to sleeve (16) through pipe fixing bolt (15) in a unthreaded hole department, fasten sleeve (16) to the cylinder head through sleeve bolt (17) in another unthreaded hole department.
5. A fuel common rail system according to claim 2 or 3, characterized in that: for the V-shaped diesel engine, the high-pressure oil supply pipes (6 and 7) comprise an A-row high-pressure oil supply pipe (6) and a B-row high-pressure oil supply pipe (7), the A-row high-pressure oil supply pipe (6) supplies oil to an A exhaust cylinder of the V-shaped diesel engine, and the B-row high-pressure oil supply pipe (7) supplies oil to a B exhaust cylinder of the V-shaped diesel engine.
6. The fuel common rail system according to claim 1, wherein: the connecting block assembly (1) is fixed on the high-pressure fuel pump bracket (13) through an assembly fixing bolt (14).
7. The fuel common rail system according to claim 6, wherein: the side surface and the top surface of the connecting block assembly (1) are respectively provided with a connecting hole, the connecting hole on the side surface is used for connecting the first high-pressure oil pipe (2) and the second high-pressure oil pipe (3), and the connecting hole on the top surface is used for connecting the high-pressure oil supply pipes (6 and 7); four mounting holes are formed in four corners of the connecting block assembly (1), and four assembly fixing bolts (14) penetrate through the mounting holes to fasten the connecting block assembly (1) to the side face of the high-pressure fuel pump bracket (13).
8. The fuel common rail system according to claim 4, wherein: the upper part of the sleeve (16) is provided with two holes for connecting the oil injection guide pipe (8), and the lower part of the sleeve (16) is also provided with two holes for connecting the cylinder cover (18).
9. The fuel common rail system according to claim 1, wherein: the valve joint (11) comprises a small end thread and a large end thread, the small end thread is matched with the external thread of the oil injection guide pipe (8), and the large end thread is matched with the mounting thread of the overflow valve (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921622013.7U CN211008931U (en) | 2019-09-26 | 2019-09-26 | Medium speed diesel engine fuel common rail system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921622013.7U CN211008931U (en) | 2019-09-26 | 2019-09-26 | Medium speed diesel engine fuel common rail system |
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| Publication Number | Publication Date |
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| CN211008931U true CN211008931U (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921622013.7U Active CN211008931U (en) | 2019-09-26 | 2019-09-26 | Medium speed diesel engine fuel common rail system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202671A (en) * | 2021-05-11 | 2021-08-03 | 四川简阳瑞特机械设备有限公司 | Novel high-low pressure oil supply system and oil supply method |
-
2019
- 2019-09-26 CN CN201921622013.7U patent/CN211008931U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202671A (en) * | 2021-05-11 | 2021-08-03 | 四川简阳瑞特机械设备有限公司 | Novel high-low pressure oil supply system and oil supply method |
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