CN213510979U - Oil supply system of high-pressure common-rail air-cooled diesel engine - Google Patents
Oil supply system of high-pressure common-rail air-cooled diesel engine Download PDFInfo
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- CN213510979U CN213510979U CN202021184954.XU CN202021184954U CN213510979U CN 213510979 U CN213510979 U CN 213510979U CN 202021184954 U CN202021184954 U CN 202021184954U CN 213510979 U CN213510979 U CN 213510979U
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Abstract
The utility model provides an oil supply system of a high-pressure common-rail air-cooled diesel engine, which comprises a high-pressure oil pump, a high-pressure oil pipe, a common-rail pipe, an oil injector and a low-pressure oil circuit; the high-pressure oil pipe comprises a high-pressure oil pipe oil inlet pipe and a high-pressure oil pipe oil outlet pipe; the low-pressure oil circuit comprises a low-pressure oil delivery pump and a fuel fine filter; the oil tank supplies oil for the low-pressure oil transfer pump; the low-pressure fuel delivery pump is connected with an inlet of the fuel fine filter through a first fuel supply pipeline; an outlet of the fuel fine filter passes through a second oil supply pipeline and then enters the high-pressure oil pump through the oil quantity metering unit; the high-pressure oil pump is connected with an oil inlet of the common rail pipe after passing through an oil inlet pipe of the high-pressure oil pipe; the oil outlet of the common rail pipe is connected with the oil injector through an oil outlet pipe of the high-pressure oil pipe; the fuel injector is communicated with the fuel tank through a fuel return pipe. The utility model discloses adaptable multiple operational environment, the stable performance improves dynamic response nature and adaptability of diesel engine under different work condition.
Description
Technical Field
The utility model relates to a diesel engine, concretely relates to forced air cooling diesel engine's oil feeding system is altogether pressed to high pressure.
Background
The air-cooled diesel engine is widely used as a power source of small-sized agriculture and industrial machinery, has simple structure, and has small volume, light weight, small heat loss, no water leakage risk and convenient maintenance compared with a water-cooled diesel engine. However, the performance of the air-cooled diesel engine fuel system is greatly influenced by the environmental temperature, the air-cooled diesel engine fuel system in the current market mainly adopts a mechanical pump fuel system, and the performance calibration is rough, so that the combustion system cannot keep the optimal working state at various environmental temperatures.
The fuel oil system has a key influence on the dynamic property, the economy and the emission property of the diesel engine, along with the stricter and stricter emission regulations, the requirements of customers on the reliability, the economy and the NVH performance of the diesel engine are higher and higher, the air-cooled diesel engine of the traditional mechanical pump can not meet the requirements of the regulations and the market, and the application of the high-pressure common rail fuel oil system on the air-cooled diesel engine is more urgent.
Accordingly, there is a need for improvements in the art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a high pressure common rail air-cooled diesel engine's that adaptability is good oil feeding system.
In order to solve the technical problem, the utility model provides an oil supply system of a high-pressure common-rail air-cooled diesel engine, which comprises a high-pressure oil pump, a high-pressure oil pipe, a common-rail pipe, an oil injector and a low-pressure oil circuit;
the high-pressure oil pipe comprises a high-pressure oil pipe oil inlet pipe and a high-pressure oil pipe oil outlet pipe;
the low-pressure oil circuit comprises a low-pressure oil delivery pump and a fuel fine filter;
the oil tank supplies oil for the low-pressure oil transfer pump; the low-pressure fuel delivery pump is connected with an inlet of the fuel fine filter through a first fuel supply pipeline; an outlet of the fuel fine filter passes through a second oil supply pipeline and then enters the high-pressure oil pump through the oil quantity metering unit; the high-pressure oil pump is connected with an oil inlet of the common rail pipe after passing through an oil inlet pipe of the high-pressure oil pipe; the oil outlet of the common rail pipe is connected with the oil injector through an oil outlet pipe of the high-pressure oil pipe; the oil injector is communicated with the oil tank through a fuel oil return pipe;
a pressure sensor is arranged on the common rail pipe; the common rail pipe is connected with the overflow tank through a pressure limiting valve; the pressure sensor is in signal connection with the pressure limiting valve.
As right the utility model discloses high pressure common rail air-cooled diesel engine's oil feeding system's improvement:
the common rail pipe is evenly provided with three oil inlet and outlet along the length direction, wherein the oil inlet and outlet in the middle of the common rail pipe are used as oil inlets and are connected with a high-pressure oil pump through a high-pressure oil pipe oil inlet pipe, the other two oil inlet and outlet are used as oil outlets, each oil outlet is connected with an oil sprayer through a high-pressure oil pipe oil outlet pipe, and the number of the high-pressure oil pipe oil outlet pipes and the number of the oil sprayers are two.
As right the utility model discloses high pressure common rail air-cooled diesel engine's oil feeding system's further improvement:
the overflow tank comprises an overflow tank body and a connecting pipeline, an inner cavity of the overflow tank body is connected with an opening of the common rail pipe through the connecting pipeline, and a pressure limiting valve is arranged at the connecting part;
an elastic device is fixedly arranged on the inner wall of the inner cavity of the overflow tank body, which is opposite to one side of the connecting pipeline; the vertical sectional area of the sliding block is the same as that of the inner channel of the connecting pipeline;
the elastic device is fixedly provided with a sliding block, when the elastic device is not pressed, one part of the sliding block is positioned in the inner cavity of the overflow tank body, the other part of the sliding block is inserted into the connecting pipeline, and the sliding block can slide in the connecting pipeline.
As right the utility model discloses high pressure common rail air-cooled diesel engine's oil feeding system's further improvement:
the head end of the sliding block is fixedly connected with the elastic device, and the periphery of the tail end of the sliding block is provided with an annular notch.
As right the utility model discloses high pressure common rail air-cooled diesel engine's oil feeding system's further improvement:
the length of the annular gap is half of the total length of the sliding block.
As right the utility model discloses high pressure common rail air-cooled diesel engine's oil feeding system's further improvement:
the overflow tank body is connected with the oil tank.
As right the utility model discloses high pressure common rail air-cooled diesel engine's oil feeding system's further improvement:
the elastic device is a spring.
The utility model discloses high pressure common rail forced air cooling diesel engine's oil feeding system's technical advantage does:
(1) the fuel supply system can realize accurate control of fuel injection, can adapt to various working environments, has stable performance, and improves the dynamic responsiveness and the adaptability of the diesel engine under different working conditions.
(2) The high-pressure common rail fuel system is adopted to control the fuel injection by the electromagnetic valve, and the control precision is high, so that the circulating fuel injection quantity change is small in the operation range of the diesel engine, and the condition of uneven fuel supply of each cylinder can be improved, thereby reducing the vibration of the diesel engine and improving the NVH performance of the diesel engine.
(3) The pressure limiting valve limits the engine oil pressure in the common rail pipe, and the overlarge pressure is avoided.
Drawings
The following describes the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a top view of the oil supply system of the high pressure common rail air-cooled diesel engine of the present invention;
FIG. 2 is a left side view of the oil supply system of the high pressure common rail air-cooled diesel engine of the present invention;
fig. 3 is a schematic view showing the structure of the common rail pipe 1 connected to the overflow tank in fig. 1.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.
Embodiment 1, an oil supply system of a high-pressure common rail air-cooled diesel engine, as shown in fig. 1-2, includes a high-pressure oil pump 6, a high-pressure oil pipe, a common rail pipe 1, an oil injector 2, and a low-pressure oil path.
The high-pressure oil pipe comprises a high-pressure oil pipe inlet pipe 5 and a high-pressure oil pipe outlet pipe 4.
The low pressure oil circuit comprises a low pressure oil delivery pump 10 and a fuel fine filter 9.
The oil tank supplies oil to a low-pressure oil delivery pump 10, the low-pressure oil delivery pump 10 is connected with an inlet of a fuel fine filter 9 through a first oil supply pipeline 11, an outlet of the fuel fine filter 9 enters a high-pressure oil pump 6 through an oil quantity metering unit 7 after passing through a second oil supply pipeline 8, and the high-pressure oil pump 6 is connected with a common rail pipe 1 after passing through a high-pressure oil pipe oil inlet pipe 5.
The common rail pipe 1 is provided with a pressure sensor 18, and the pressure sensor 18 is used for measuring the engine oil pressure in the common rail pipe 1 in real time and feeding a pressure signal back to the electronic control unit for controlling the opening and closing of the pressure limiting valve 14.
A plurality of oil inlet and outlet ports (three in the figure) are uniformly arranged on the common rail pipe 1 along the length direction, wherein the oil inlet and outlet ports positioned in the middle of the common rail pipe 1 are used as oil inlets and are connected with a high-pressure oil pump 6 through a high-pressure oil pipe oil inlet pipe 5, the other two oil inlet and outlet ports are used as oil outlets, each oil outlet is connected with the oil injector 2 through a high-pressure oil pipe oil outlet pipe 4, and the number of the high-pressure oil pipe oil outlet pipes 4 and the number of the oil injectors 2.
One end of the common rail pipe 1 is opened and is connected with the overflow tank through a pressure limiting valve 14.
The overflow tank comprises an overflow tank body 12 and a connecting pipeline 13, the inner cavity of the overflow tank body 12 is connected with the opening of the common rail pipe 1 through the connecting pipeline 13, and a pressure limiting valve 14 is arranged at the joint.
An elastic device 15 is fixedly arranged on the inner wall of the inner cavity of the overflow tank body 12, which is opposite to one side of the connecting pipeline 13, the elastic device 15 is a spring and the like, a sliding block 16 is fixedly arranged on the elastic device 15, and the vertical sectional area of the sliding block 16 is the same as that of an inner channel of the connecting pipeline 13. When the spring is not compressed, one part of the slide block 16 is positioned in the inner cavity of the overflow tank body 12, the other part of the slide block 16 is inserted into the connecting pipeline 13, and the slide block 16 can slide in the connecting pipeline 13.
The overflow tank body 12 can also be connected with an oil tank through a valve, and the engine oil stored in the overflow tank body 12 can flow back to the oil tank.
The head end of the sliding block 16 is fixedly connected with the elastic device 15, the periphery of the tail end of the sliding block 16 is provided with an annular notch 17, and the length of the annular notch 17 is half of the total length of the sliding block 16.
When the pressure sensor 18 detects that the pressure in the common rail pipe 1 is too high, the electronic control unit controls the pressure limiting valve 14 to be opened, and engine oil in the common rail pipe 1 extrudes the sliding block 16, so that the elastic device 15 is compressed, the sliding block 16 slides towards the inner cavity of the overflow tank body 12 until the annular notch 17 is communicated with the inner cavity of the overflow tank body 12, and at the moment, the engine oil enters the inner cavity of the overflow tank body 12 through the annular notch 17 to be stored.
After the pressure sensor 18 detects that the pressure in the common rail pipe 1 returns to normal, the electronic control unit controls the pressure limiting valve 14 to close after a certain time delay, and the certain time delay is used for resetting the sliding block 16. Under the elastic force of the compression elastic device 15, the sliding block 16 slides into the connecting pipeline 13 and returns to the original position.
The oil sprayer 2 is provided with a spray hole, an electromagnetic valve is arranged in the spray hole, and the spray hole of the oil sprayer 2 can be opened and closed through the electromagnetic valve. The fuel injector 2 is communicated with a fuel tank through a fuel return pipe 3.
When the engine works, fuel oil is supplied from the oil tank to the fuel oil fine filter 9 through the low-pressure fuel delivery pump 10 for further filtering, and the fuel oil after fine filtering flows through the oil quantity metering unit 7 and enters the high-pressure oil pump 6. The high-pressure oil pump 6 is directly driven by an oil pump cam on the camshaft to generate high-pressure fuel oil.
High-pressure fuel oil output by a high-pressure oil pump 6 enters a common rail pipe 1 through a high-pressure oil pipe inlet pipe 5, the common rail pipe 1 maintains high fuel oil pressure, the fuel oil in the common rail pipe 1 is connected with an oil injector 2 through a high-pressure oil pipe outlet pipe 4, an electric control unit is connected with each sensor through a wire harness and analyzes each electric signal, and therefore the oil injection time and the oil injection duration of the fuel oil are controlled by accurately controlling the action of an electromagnetic valve of the oil injector 2. Excess fuel in the fuel line flows back to the fuel tank through the fuel return line 3.
The oil quantity metering unit 7 and the sensor form closed-loop control on rail pressure, the fuel pressure in the common rail pipe 1 is kept in a reasonable interval by adjusting the oil quantity entering the common rail pipe 1, and redundant fuel in the fuel pipeline flows back to the fuel tank through the fuel return pipe 3.
Finally, it is also noted that the above-mentioned list is only a few specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many modifications are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the invention should be considered as within the scope of the invention.
Claims (7)
1. Oil supply system of high pressure common rail air-cooled diesel engine, its characterized in that: the device comprises a high-pressure oil pump (6), a high-pressure oil pipe, a common rail pipe (1), an oil injector (2) and a low-pressure oil way;
the high-pressure oil pipe comprises a high-pressure oil pipe oil inlet pipe (5) and a high-pressure oil pipe oil outlet pipe (4);
the low-pressure oil circuit comprises a low-pressure oil delivery pump (10) and a fuel fine filter (9);
the oil tank supplies oil for the low-pressure oil transfer pump (10); the low-pressure fuel delivery pump (10) is connected with an inlet of the fuel fine filter (9) through a first fuel supply pipeline (11); an outlet of the fuel fine filter (9) passes through a second oil supply pipeline (8) and then enters the high-pressure oil pump (6) through the oil quantity metering unit (7); the high-pressure oil pump (6) is connected with an oil inlet of the common rail pipe (1) through an oil inlet pipe (5) of a high-pressure oil pipe; the oil outlet of the common rail pipe (1) is connected with the oil injector (2) through an oil outlet pipe (4) of a high-pressure oil pipe; the oil injector (2) is communicated with an oil tank through a fuel oil return pipe (3);
a pressure sensor (18) is arranged on the common rail pipe (1); the common rail pipe (1) is connected with an overflow tank through a pressure limiting valve (14); the pressure sensor (18) is in signal connection with the pressure limiting valve (14).
2. The oil supply system of the high-pressure common rail air-cooled diesel engine according to claim 1, wherein:
the common rail pipe (1) is evenly provided with three oil inlet and outlet along the length direction, wherein the oil inlet and outlet in the middle of the common rail pipe (1) is connected with the high-pressure oil pump (6) as an oil inlet and an oil inlet pipe (5) through a high-pressure oil pipe, the other two oil inlet and outlet are oil outlets, each oil outlet is connected with the oil sprayer (2) through a high-pressure oil pipe outlet pipe (4), and the number of the high-pressure oil pipe outlet pipes (4) and the oil sprayers (2) is two.
3. The oil supply system of the high-pressure common rail air-cooled diesel engine according to claim 2, wherein:
the overflow tank comprises an overflow tank body (12) and a connecting pipeline (13), the inner cavity of the overflow tank body (12) is connected with the opening of the common rail pipe (1) through the connecting pipeline (13), and a pressure limiting valve (14) is arranged at the connecting position;
an elastic device (15) is fixedly arranged on the inner wall of the inner cavity of the overflow tank body (12) on one side relative to the connecting pipeline (13);
the elastic device (15) is fixedly provided with a sliding block (16), when the elastic device (15) is not pressed, one part of the sliding block (16) is positioned in the inner cavity of the overflow tank body (12), the other part of the sliding block (16) is inserted into the connecting pipeline (13), and the sliding block (16) can slide in the connecting pipeline (13);
the vertical sectional area of the sliding block (16) is the same as that of the inner channel of the connecting pipeline (13).
4. The oil supply system of the high-pressure common rail air-cooled diesel engine according to claim 3, wherein:
the head end of the sliding block (16) is fixedly connected with the elastic device (15), and annular notches (17) are formed in the periphery of the tail end of the sliding block (16).
5. The oil supply system of the high-pressure common rail air-cooled diesel engine according to claim 4, wherein:
the length of the annular gap (17) is half of the total length of the sliding block (16).
6. The oil supply system of the high-pressure common rail air-cooled diesel engine according to claim 5, wherein:
the overflow tank body (12) is connected with the oil tank.
7. The oil supply system of the high-pressure common rail air-cooled diesel engine according to claim 6, wherein:
the elastic device (15) is a spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021184954.XU CN213510979U (en) | 2020-06-23 | 2020-06-23 | Oil supply system of high-pressure common-rail air-cooled diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021184954.XU CN213510979U (en) | 2020-06-23 | 2020-06-23 | Oil supply system of high-pressure common-rail air-cooled diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213510979U true CN213510979U (en) | 2021-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021184954.XU Active CN213510979U (en) | 2020-06-23 | 2020-06-23 | Oil supply system of high-pressure common-rail air-cooled diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213510979U (en) |
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- 2020-06-23 CN CN202021184954.XU patent/CN213510979U/en active Active
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