CN216665800U

CN216665800U - Flow guide structure of air-entraining direct injection system

Info

Publication number: CN216665800U
Application number: CN202122867080.9U
Authority: CN
Inventors: 张长岭; 石杰勇; 张大鹏; 白冰
Original assignee: Guangxi Yinyi Power Technology Co ltd
Current assignee: Guangxi Yinyi Power Technology Co ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-06-03
Anticipated expiration: 2031-11-22

Abstract

The invention aims to provide a flow guide structure of an air-entraining direct injection system, which directly guides fuel oil sprayed by a fuel oil nozzle relative to an air-entraining direct injection nozzle at any angle into a premixing cavity of the air-entraining direct injection nozzle, reduces the escape of the fuel oil into a compressed air channel, reduces the loss of the fuel oil and can improve the atomization quality of the fuel oil sprayed into a cylinder. The structure can meet the fuel atomization quality requirements of the fuel nozzle and the gas-containing direct injection nozzle at different assembly angles, and effectively reduces the height of the engine and the size of the engine by adjusting the installation angle of the fuel nozzle and the gas-containing direct injection nozzle.

Description

Flow guide structure of air-entraining direct injection system

Technical Field

The invention relates to a flow guide structure of an air-entraining direct injection system, belonging to the part structure of an internal combustion engine.

Background

The air-entraining direct injection technology is that 2 nozzles (a fuel nozzle and an air-entraining direct injection nozzle) are simultaneously installed on an engine cylinder cover, wherein the fuel nozzle injects fuel into the top of the air-entraining direct injection nozzle to be premixed with compressed air in the air-entraining direct injection nozzle, and then the direct injection nozzle injects an oil-gas mixture into a cylinder at a high speed under a certain low pressure under the control of an accurate electronic control system. The air in the air-entraining direct injection nozzle is utilized to induce cavitation and cavitation of liquid fuel, so that the fuel oil is crushed once in the nozzle, and the fuel oil can be rapidly crushed twice into liquid drops with extremely small particle size when being sprayed out of the nozzle. The oil injection mode can optimize the atomization process of fuel oil, so that the ignition combustion mode can be realized only by heavy oil in a compression ignition combustion mode in the prior art, the cast iron cylinder body of the traditional compression ignition type heavy oil engine can be changed into an all-aluminum cylinder body, the combustion speed and the thermal efficiency of the ignition engine are ensured, the whole weight of the engine is greatly reduced, and the fuel oil injection mode is perfectly suitable for a small unmanned aerial vehicle. However, since the direct air injection assembly is generally mounted on the engine cylinder cover, the height of the engine is inevitably increased, and the space of the power cabin of the unmanned aerial vehicle is limited due to the overall size requirement, which imposes a strict requirement on the external size of the engine.

Disclosure of Invention

The invention aims to provide a flow guide structure of an air-entraining direct injection system, which directly guides fuel oil sprayed out from a fuel oil nozzle relative to an air-entraining direct injection nozzle at any angle into a premixing cavity of the air-entraining direct injection nozzle, reduces the escape of the fuel oil into a compressed air channel, reduces the loss of the fuel oil and can improve the atomization quality of the fuel oil sprayed into a cylinder. The structure can meet the requirements of fuel atomization quality of the fuel nozzle and the gas-entraining direct injection nozzle under different assembly angles.

The flow guide structure comprises a flow guide sleeve, a fuel guide pipe and an O-shaped ring. The latter half of water conservancy diversion cover design for the back taper structure, the central design fuel pipe mounting hole. The fuel guide pipe is assembled in the fuel guide pipe mounting hole, then four compressed air channels are uniformly distributed on the conical bottom surface of the flow guide sleeve by taking the center of the fuel guide pipe as an axis, and the center line of each compressed air channel and the center line of the fuel guide pipe form an alpha included angle. Extension lines of central lines of the four compressed air channels are converged on a central line of the fuel guide pipe so as to guide the compressed air to intensively impact fuel sprayed by the fuel guide pipe. When the air-entraining direct injection nozzle is opened instantly, high-pressure air impacts fuel oil through the four compressed air channels, the cavitation and cavitation induction effects of the gas dynamics of the compressed air on the fuel oil are fully utilized, and the atomization quality of the fuel oil sprayed into the cylinder is improved.

The inlet of the fuel conduit is flush with the upper end of the guide sleeve, the outlet of the fuel conduit is flush with the bottom surface of the guide sleeve and lower than the outlet of the compressed air channel, so that fuel sprayed by the fuel nozzle is directly guided into the premixing cavity through the fuel conduit, the fuel is prevented from escaping into the compressed air channel, and the fuel loss is reduced. The fuel guide pipe adopts a slender hole structure to improve the flow rate of fuel, and is favorable for the full mixing of the fuel and compressed air in the gas-entraining direct injection nozzle premixing cavity.

The guide sleeve comprises two O-shaped rings up and down to ensure the sealing of the oil rail shell. The upper O-shaped ring is matched with the oil channel side of the oil rail shell to seal and isolate an air inlet channel and an oil inlet channel in the oil rail shell, so that fuel oil sprayed by the fuel nozzle is sprayed into a premixing cavity at the upper end of the air-entraining direct injection nozzle through a fuel oil guide pipe to complete the full mixing of the fuel oil and compressed air. The lower O-shaped ring ensures the sealing of compressed air and fuel in the oil rail shell.

In summary, the flow guiding structure of the air-entraining direct injection system provided by the invention can meet the fuel atomization quality requirements of the fuel nozzle and the air-entraining direct injection nozzle under different installation angles, and the height of the engine is effectively reduced and the size of the engine is reduced by adjusting the installation angles of the fuel nozzle and the air-entraining direct injection nozzle.

Drawings

FIG. 1 is a schematic view of an overall assembly structure of a diversion structure assembly;

FIG. 2 is a top view of a flow directing feature assembly;

FIG. 3 is a cross-sectional view of a flow directing feature assembly;

reference numbers in the figures: the air entrainment direct injection assembly comprises-00 parts of an air entrainment direct injection assembly, 01 parts of an oil rail shell, 02 parts of a fuel nozzle, 03 parts of a flow guide structure assembly, 04 parts of an air entrainment direct injection nozzle, 011 parts of an air inlet channel, 012 parts of an oil inlet channel, 031 parts of a flow guide sleeve, 032 parts of a fuel conduit, 033 parts of an O-shaped ring, 0311 parts of a fuel conduit mounting hole, 0312 parts of a compressed air channel and 041 parts of a premixing cavity.

Detailed Description

The structure of the invention is further explained in the following by combining the drawings:

the technical scheme adopted by the invention is as follows: a flow guide structure of an air-entraining direct injection system, wherein a flow guide structure assembly 03 comprises a flow guide sleeve 031, a fuel guide pipe 032 and an O-shaped ring 033.

The water conservancy diversion cover 031 the latter half adopt the back taper structure, water conservancy diversion cover 031 arranges compressed air passageway 0312 and fuel pipe mounting hole 0311. The fuel guide pipe 032 is assembled in the fuel guide pipe installation hole 0311, four compressed air channels 0312 are uniformly distributed on the conical bottom surface of the flow guide sleeve 031 by taking the center of the fuel guide pipe 032 as an axis, and the center line of the compressed air channel 0312 and the center line of the fuel guide pipe form an included angle alpha. Extension lines of central lines of the four compressed air passages 0312 are converged on a central line of the fuel guide 032 to guide compressed air to concentrate on fuel sprayed from the fuel guide 032 to impact the fuel. When the air-entraining direct injection nozzle 04 is instantly opened, the high-pressure air impacts the fuel sprayed from the fuel guide pipe 032 through the four compressed air channels 0312 in the flow guide sleeve 031, thereby fully utilizing the cavitation and cavitation induction effects of the gas dynamics of the compressed air on the fuel and improving the atomization quality of the fuel sprayed into the cylinder.

The inlet of the fuel conduit 032 is flush with the upper end of the flow guide sleeve 031, the outlet is flush with the bottom surface of the flow guide sleeve 031, and the outlet is lower than the outlet of the compressed air channel 0312, so that the fuel can be directly guided into the premixing cavity 041, the fuel can be prevented from escaping into the compressed air channel 0312, and the fuel loss can be reduced. The fuel conduit 032 adopts a slender hole structure to improve the flow rate of fuel, which is beneficial to the full mixing of fuel and compressed air. The inner diameter of the fuel conduit 032 can be designed according to different physical parameters of the fuel, so that flexible design is realized.

The guide sleeve 031 is arranged with two O-shaped rings 033 from top to bottom to ensure the sealing of the oil rail shell 01. The upper O-shaped ring 033 is matched with the oil channel side in the oil rail shell 01 to seal and isolate the air inlet channel 011 and the oil inlet channel 012 in the oil rail shell 01, so that fuel sprayed by the fuel nozzle 02 is sprayed into a premixing cavity 041 at the upper end of the air-entraining direct injection nozzle 04 through a fuel conduit 032 to complete the full mixing of the fuel and compressed air. The lower O-ring 033 ensures a seal for compressed air and fuel in the rail housing 01.

The assembly mode is as follows: as shown in fig. 1, this assembly method only takes a typical air-entrainment direct-injection assembly structure in which the fuel nozzle and the air-entrainment direct-injection nozzle form an included angle of 90 degrees as an example. Firstly, a fuel conduit 032 is installed in a fuel conduit installation hole 0311 in the center of a flow guide sleeve 031, an upper O-shaped ring 033 and a lower O-shaped ring 033 are installed in the flow guide sleeve 031 to complete the assembly of a flow guide structure assembly 03, then the flow guide structure assembly 03 is installed at a premixing cavity 041 of an air-entrainment direct-injection nozzle 04 in an interference fit manner, the degree of freedom of the flow guide structure assembly 03 is limited through interference fit, and finally an oil rail shell 01 is installed on the flow guide structure assembly 03 to complete the assembly of the air-entrainment direct-injection assembly 00.

The working process is as follows: referring to fig. 1 and 3, before the air-entrainment direct injection nozzle 04 is not opened, the high-pressure air in the oil rail housing 01 is filled in the diversion structure assembly 03 and the air-entrainment direct injection nozzle 04 through the air inlet 011 and the four compressed air passages 0312. When the fuel nozzle 02 is opened, fuel is sprayed into the oil inlet path 012 of the oil rail shell 01, and the oil duct and the air path in the oil rail shell 01 are sealed and isolated from each other by the upper O-ring 033 of the flow guide sleeve 031, so that the fuel sprayed by the fuel nozzle 02 is sprayed into the premixing cavity 041 of the air-entrainment direct injection nozzle 04 through the fuel guide pipe 032, and the fuel and the air are fully mixed. When the air entrainment direct injection nozzle 04 is opened instantly, the formed mixed gas in the premixing cavity is directly injected into the cylinder, meanwhile, the high-pressure gas of the four compressed air channels 0312 impacts the fuel continuously sprayed out of the fuel guide pipe 032 and is injected into the cylinder, the gas dynamics of the compressed air is fully utilized to have cavitation and cavitation induction effects on the fuel, the fuel atomization quality in the injected cylinder is improved, and the work of the air entrainment direct injection system diversion structure is completed. The opening angles of the fuel nozzle 02 and the air-entraining direct injection nozzle 04 are accurately controlled by the engine ECU, so that the best atomization effect is obtained when fuel is injected into the cylinder.

The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously, many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A flow guide structure of an air-entrainment direct injection system is characterized by comprising a flow guide sleeve (031), a fuel conduit (032) and an O-shaped ring (033); the guide sleeve (031) is provided with a compressed air channel (0312) and a fuel conduit mounting hole (0311); the fuel guide pipe (032) is assembled in a fuel guide pipe mounting hole (0311) of the flow guide sleeve (031); two O-shaped rings (033) are arranged on the guide sleeve (031) up and down to ensure the sealing of the oil rail shell (01).

2. The flow guide structure of an air-entraining direct injection system according to claim 1, characterized in that the lower half of the flow guide sleeve (031) is an inverted cone structure, and four compressed air channels (0312) are uniformly distributed on the conical bottom surface of the flow guide sleeve (031) with the center of the fuel conduit (032) as the axis.

3. The flow guiding structure of a direct air injection system according to claim 1, wherein the center lines of four compressed air channels (0312) form an angle α with the center line of the fuel conduit (032), the angle α is 10 ° to 30 °, and the extension lines of the center lines of four compressed air channels (0312) converge on the center line of the fuel conduit (032).

4. The flow guiding structure of a direct air injection system according to claim 1, wherein the fuel guide pipe (032) is installed in the fuel guide pipe installation hole (0311) of the flow guiding sleeve (031), the inlet of the fuel guide pipe (032) is flush with the top surface of the flow guiding sleeve (031), the outlet is flush with the bottom surface of the flow guiding sleeve (031), and the outlet is lower than the outlet of the compressed air channel (0312).

5. The flow guide structure of a direct gas injection system according to claim 1, wherein the fuel guide pipe (032) is of an elongated hole structure, and the inner diameter of the fuel guide pipe (032) can be designed according to different physical parameters of the fuel, so as to achieve sufficient atomization of different fuels and achieve a flexible design.

6. The flow guiding structure of a direct air injection system according to claim 1, wherein two O-rings (033) are disposed above and below the flow guiding sleeve (031), and the upper O-ring (033) is matched with the oil channel side of the oil rail housing (01) to seal and isolate the air inlet channel (011) and the oil inlet channel (012) in the oil rail housing (01) from each other; the lower O-shaped ring (033) ensures the sealing of compressed air and fuel in the oil rail shell (01).