CN218235325U - Fuel pressure adjusting structure for gas-trapping direct injection engine - Google Patents
Fuel pressure adjusting structure for gas-trapping direct injection engine Download PDFInfo
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- CN218235325U CN218235325U CN202221071277.XU CN202221071277U CN218235325U CN 218235325 U CN218235325 U CN 218235325U CN 202221071277 U CN202221071277 U CN 202221071277U CN 218235325 U CN218235325 U CN 218235325U
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- fuel pressure
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- regulating valve
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
An object of the utility model is to provide a fuel pressure adjusts structure for pressing from both sides gas direct injection engine, its characterized in that: the fuel pressure adjusting structure comprises an oil rail, a gas compressor cover plate and a fastening bolt. The upper half part of the fuel pressure regulating valve is arranged on the fuel rail and is communicated with the oil inlet hole and the oil return hole, the lower half part of the fuel pressure regulating valve is arranged on the compressor cover plate and is communicated with the air chamber, and the fuel pressure regulating valve regulates the fuel pressure through the pressure difference between the fuel pressure and compressed air to ensure the stability of the fuel pressure.
Description
Technical Field
The utility model relates to a fuel pressure adjusts structure for pressing from both sides gas direct injection engine belongs to internal-combustion engine part structure.
Background
The air-entraining direct injection system sprays fuel oil and air, the direct injection nozzle injects the oil-air mixture into the cylinder at high speed, and the fuel oil is broken into fine particles by means of the scouring disturbance effect of high-speed compressed air so as to meet the requirement of the direct injection engine on fuel oil spraying characteristics. The direct injection system with gas entrainment is widely applied to the field of two-stroke unmanned aerial vehicle engines, so that fuel loss caused by scavenging of mixed gas is avoided, the fuel economy of the two-stroke engines is improved, heavy fuel such as aviation kerosene, diesel oil and the like is ignited and combusted, the disadvantage of low power-to-weight ratio of the traditional compression ignition engine is avoided, and the power-to-weight ratio requirement of the existing unmanned aerial vehicle on the heavy fuel engine can be met.
In order to ensure the reliability and accuracy of fuel injection, the pressure of the fuel and the pressure of compressed air are regulated within a certain pressure difference range so as to meet the requirement of a direct injection engine on the fuel spraying characteristic, and the pressure regulation is completed by a fuel pressure regulating valve.
In a fuel-air guide rail structure for an air-entraining direct injection engine disclosed in chinese patent CN210769103U, an upper half portion of a fuel pressure regulating valve is disposed on a fuel rail and communicated with an oil return, and a lower half portion is disposed on an air rail and communicated with compressed air, and the fuel pressure regulating valve regulates fuel pressure through a pressure difference between the fuel pressure and the compressed air.
By adopting the fuel-air guide rail structure disclosed by the patent, the fuel pressure regulating valve is exposed at the upper part of the cylinder cover, and resistance is generated in the flight process of the unmanned aerial vehicle; in the fuel-air guide rail structure in the patent, over-constraint exists between the fuel pressure regulating valve and the fuel injector, so that the fuel pressure regulating valve cannot be completely fixed, leakage is easy to occur, and the reliability of an engine is reduced; the fuel-air rail structure of the above patent is mounted on the cylinder head, and the fuel pipe joint needs to be connected to the fuel-air rail structure, which is not easy to assemble and maintain, and simultaneously, the mass of the upper part of the cylinder head is increased, and the center of gravity of the engine is increased.
Disclosure of Invention
In order to solve the above problem, an object of the present invention is to provide a fuel pressure adjusting structure for a direct injection engine with air entrainment, which is characterized in that: the fuel pressure adjusting structure comprises an oil rail, a compressor cover plate and a fastening bolt; the oil rail is fastened on the compressor cover plate through the fastening bolt, and a cavity formed after the oil rail and the compressor cover plate are installed is an installation position of the fuel pressure regulating valve; the upper part of the fuel pressure regulating valve is arranged in the fuel rail, and the lower part of the fuel pressure regulating valve is arranged in the cover plate of the compressor.
The oil rail is in a step shape layer by layer, two oil holes are sequentially arranged from top to bottom, the upper oil hole is an oil return hole, the lower oil hole is an oil inlet hole, an upper mounting hole of the fuel pressure regulating valve is formed in the oil rail, and a plurality of semicircular bosses radially extend out of the bottommost step and are provided with mounting holes for mounting the compressor cover plate.
The upper part of the compressor cover plate is provided with a mounting hole at the lower part of the fuel pressure regulating valve, and the lower part of the compressor cover plate is provided with a compressor air chamber; and a pressure stabilizing cavity is arranged below the mounting hole at the lower part of the fuel pressure regulating valve and is communicated with the air chamber through a plurality of pressure stabilizing cavity air inlets arranged among the pressure stabilizing cavity air inlets, and the axis of each pressure stabilizing cavity air inlet and the axis of the mounting hole at the lower part of the fuel pressure regulating valve have a certain included angle, wherein the included angle range is more than 0 degree and less than 35 degrees. An air nozzle air inlet channel is further arranged beside an air compressor air chamber at the lower part of the air compressor cover plate, and a plurality of oil rail fastening threaded holes and crankcase mounting holes are respectively arranged at the upper part and the lower part of the air compressor cover plate.
Has the beneficial effects that:
after the fuel pressure regulating valve is installed, the fuel pressure regulating valve is fixed in the fuel rail and the gas compressor cover plate through fastening bolts, so that over-restraint is avoided, and the leakage risk is reduced; the whole fuel pressure adjusting structure is fixed on the crankcase through a fastening screw, so that the gravity center of the engine is reduced, the running reliability of the engine is improved, and meanwhile, the assembly and maintenance of an oil pipe are facilitated; after the fuel pressure regulating valve is moved to the upper compressor cover plate of the crankcase from the fuel-air guide rail structure on the upper portion of the cylinder cover, the cross section of the upper portion of the cylinder cover is reduced, air resistance generated in the flight process of the unmanned aerial vehicle is reduced, meanwhile, the temperature of the cylinder cover is prevented from heating compressed air in a pressure stabilizing cavity, and air supply stability is improved.
Drawings
FIG. 1 is a perspective view of the utility model in use;
in the figure:
10-an oil rail; 20-a compressor cover plate; 30-fastening bolts; 40-hollow bolts;
50-tubing joint; 60-double-ended tubing joints; 70-fuel pressure regulating valve;
80-a crankcase;
FIG. 2 is a top view of a compressor cover plate;
in the figure:
21-a pressure stabilizing cavity air inlet channel; 22-crankcase mounting holes;
FIG. 3 isbase:Sub>A cross-sectional view A-A of FIG. 2;
in the figure:
23-air nozzle inlet; 24-a pressure stabilizing cavity;
25-a mounting hole at the lower part of the fuel pressure regulating valve; 26-oil rail fastening threaded holes; 27-air chamber;
fig. 4 is a top view of the oil rail:
in the figure:
11-mounting holes;
FIG. 5 isbase:Sub>A cross-sectional view A-A of FIG. 4;
in the figure:
12-mounting holes at the upper part of the fuel pressure regulating valve; 13-oil return hole; 14-oil inlet hole.
Detailed Description
The structure of the present invention is further explained with the following drawings:
the utility model provides a fuel pressure adjusts structure for pressing from both sides gas direct injection engine, fuel pressure adjusts structure includes oil rail (10), compressor apron (20), fastening bolt (30).
An oil inlet hole (14), an oil return hole (13), a mounting hole (12) in the upper portion of the fuel pressure regulating valve and a mounting hole (11) are arranged on the fuel rail, and fuel oil with stable pressure is mainly provided for the fuel oil injector.
The compressor cover plate (20) is provided with a lower mounting hole (25) of a fuel pressure regulating valve, a pressure stabilizing cavity (24), an air nozzle air inlet channel (23), an air chamber (27), a pressure stabilizing cavity air inlet channel (21), a crankcase mounting hole (22) and an oil rail fastening threaded hole (26), and compressed air with stable pressure is mainly provided for the air nozzle and the fuel pressure regulating valve.
The upper half part of a fuel pressure regulating valve (70) is arranged in an oil rail (10) and is communicated with an oil inlet hole (14) and an oil return hole (13), the lower half part of the fuel pressure regulating valve is arranged in a compressor cover plate (20) and is communicated with an air chamber (27) through a plurality of pressure stabilizing cavity air inlets (21), and the fuel pressure regulating valve (70) regulates the fuel pressure through the pressure difference between fuel and compressed air.
The assembly mode is as follows:
as shown in fig. 1-5: the oil pipe joint (50) and the double-head oil pipe joint (60) are respectively installed at an oil return hole (13) and an oil inlet hole (14) of an oil rail through hollow bolts (40), then the upper half part of a fuel pressure regulating valve (70) is installed in an upper installation hole (12) of the fuel pressure regulating valve of the oil rail (10), then the oil rail (10) with the assembled oil pipe joint (50/60) and the fuel pressure regulating valve (70) is installed on a compressor cover plate (20) through fastening bolts (30), and finally the whole set of fuel pressure regulating structure is installed on a crankcase (80) through the fastening bolts (30), so that all installation work is completed.
The working principle is as follows:
as shown in fig. 1-5, in normal operation of the engine, a compressor mounted on a crankcase (80) operates normally, and compresses air into a compressor cover plate air chamber (27), and the compressed air is delivered to an air nozzle along an air nozzle inlet passage (23), and on the other hand, the compressed air enters a surge chamber (24) along a surge chamber inlet passage (21) to provide stable pressure for a fuel pressure regulating valve (70). In the aspect of an oil way, fuel oil is firstly accessed from one end of the double-end oil pipe joint (60), and one path of fuel oil flows to a fuel oil ejector through the other end of the double-end oil pipe joint (60) to provide fuel oil for an engine; the other path of the compressed air enters the oil rail (10) through the hollow bolt (40) and reaches the upper part of the fuel pressure regulating valve (70), the fuel pressure regulating valve (70) opens a backflow channel under the combined action of the fuel pressure and the compressed air pressure, and the fuel can flow to the oil rail oil return hole (13) through the fuel pressure regulating valve (70) at the moment and is finally recovered through the oil pipe joint (50).
Preferably, the axis of the air inlet channel (21) of the pressure stabilizing cavity and the axis of the mounting hole (25) at the lower part of the fuel pressure regulating valve form a certain included angle alpha (0-35) so as to be beneficial to the stability of air flow in the pressure stabilizing cavity (24).
Claims (4)
1. A fuel pressure adjusting structure for an air-entrainment direct injection engine is characterized in that: the fuel pressure adjusting structure comprises a fuel rail (10), a compressor cover plate (20) and a fastening bolt (30); the oil rail (10) is fastened on the compressor cover plate (20) through the fastening bolt (30), and a cavity formed after the oil rail (10) and the compressor cover plate (20) are installed is an installation position of the fuel pressure regulating valve (70); wherein, the upper part of the fuel pressure regulating valve (70) is arranged in the oil rail (10), and the lower part is arranged in the compressor cover plate (20).
2. The fuel pressure adjustment structure for a direct injection with trapped air engine according to claim 1, characterized in that: the oil rail (10) is in a step shape layer by layer, two oil holes are sequentially arranged from top to bottom, the upper oil hole is an oil return hole (13), the lower oil hole is an oil inlet hole (14), a fuel pressure regulating valve upper mounting hole (12) is arranged inside the oil rail, and a plurality of semicircular bosses radially extend out of the bottommost step and are provided with mounting holes (11) for mounting the compressor cover plate (20).
3. The fuel pressure adjusting structure for the air-entrained direct injection engine according to claim 1, characterized in that: the upper part of the compressor cover plate (20) is provided with a fuel pressure regulating valve lower part mounting hole (25), and the lower part is provided with a compressor air chamber (27); the fuel pressure regulating valve is characterized in that a pressure stabilizing cavity (24) is arranged below the lower mounting hole (25) of the fuel pressure regulating valve, the pressure stabilizing cavity (24) is communicated with the air chamber (27) through a plurality of pressure stabilizing cavity air inlet channels (21) arranged between the pressure stabilizing cavity air inlet channels, the axis of each pressure stabilizing cavity air inlet channel (21) and the axis of the lower mounting hole (25) of the fuel pressure regulating valve are provided with a certain included angle alpha, and the included angle alpha is more than or equal to 0 degree and less than or equal to 35 degrees.
4. The fuel pressure adjustment structure for a direct injection with trapped air engine according to claim 1, characterized in that: an air nozzle air inlet channel (23) is further arranged beside an air compressor air chamber (27) at the lower part of the air compressor cover plate (20), and a plurality of oil rail fastening threaded holes (26) and crankcase mounting holes (22) are respectively arranged at the upper part and the lower part of the air compressor cover plate (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221071277.XU CN218235325U (en) | 2022-05-07 | 2022-05-07 | Fuel pressure adjusting structure for gas-trapping direct injection engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221071277.XU CN218235325U (en) | 2022-05-07 | 2022-05-07 | Fuel pressure adjusting structure for gas-trapping direct injection engine |
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| Publication Number | Publication Date |
|---|---|
| CN218235325U true CN218235325U (en) | 2023-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221071277.XU Active CN218235325U (en) | 2022-05-07 | 2022-05-07 | Fuel pressure adjusting structure for gas-trapping direct injection engine |
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| CN (1) | CN218235325U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115929527A (en) * | 2023-01-10 | 2023-04-07 | 北京理工大学 | Air-assisted injection device suitable for aviation heavy oil |
-
2022
- 2022-05-07 CN CN202221071277.XU patent/CN218235325U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115929527A (en) * | 2023-01-10 | 2023-04-07 | 北京理工大学 | Air-assisted injection device suitable for aviation heavy oil |
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