Oil injection system of quick starting system of engine
By using a combination of a combustion chamber obliquely mounted high-pressure nozzle and a high-pressure pulse igniter in a turbojet engine, rapid heating of the combustion chamber is achieved, solving the problem of low heating efficiency in the prior art, and improving the starting efficiency and service life of the engine.
Patent Information
- Application Number
- CN202422458836.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-10-11
AI Technical Summary
The combustion chamber heating method of existing turbojet engines is low in efficiency, has a small heating area and slow heat propagation, which leads to slow combustion chamber temperature rise and affects the engine starting efficiency.
The combustion chamber obliquely installed high-pressure nozzle and high-pressure pulse igniter are used to atomize the fuel by instantly generating 2-3 atmospheres of pressure through the high-pressure nozzle and inject it onto the blue arc generated by the high-pressure pulse ignition tip to form a rapidly atomized combustion chamber preheating environment, which is combined with the abdominal cavity and evaporation tube assembly in the combustion chamber for heating.
The combustion chamber temperature is achieved rapidly, the engine start efficiency is improved, and the engine service life is increased.
Smart Images
Figure CN223048897U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of engine starting devices, and particularly relates to an oil injection system of an engine quick start system. Background Art
[0002] A model aircraft is a scaled-down version of an airplane. Most of the engines in model aircrafts are turbojet engines. The structure of a turbojet engine consists of an air intake, a compressor, a combustion chamber, a turbine, and a tailpipe. Its working principle is that gas enters the combustion chamber after being compressed by the compressor through the air intake. It is ignited and burned in the combustion chamber to eject gas to drive the turbine to rotate. The high-temperature and high-pressure gas flowing out from the turbine continues to expand in the tailpipe and is discharged backward from the nozzle at a high speed along the axial direction of the engine. This speed is much greater than the speed of the air flow entering the engine, enabling the engine to obtain a reaction thrust.
[0003] Currently, the main combustion chamber heating method adopted by turbojet engines is spark ignition, that is: the fuel injection port in the combustion chamber points to the spark plug, and the spark plug is used to ignite the fuel in the combustion chamber of the turbojet engine, so as to increase the temperature of the combustion chamber for preheating.
[0004] This heating method has low efficiency, a small heating area, slow heat propagation, and slow temperature rise in the combustion chamber. Content of the Utility Model
[0005] Based on the above deficiencies of the prior art, the technical problem solved by the utility model is to provide an oil injection system of an engine quick start system. Through an inclined high-pressure nozzle in the combustion chamber, 2 - 3 atmospheres are generated instantaneously to atomize the fuel and spray it onto the blue arc generated by the high-voltage pulsed ignition tip discharge, forming a preheating environment for rapid atomization in the combustion chamber, thereby rapidly increasing the temperature of the combustion chamber.
[0006] To solve the above technical problem, the utility model is realized through the following technical solutions: The utility model provides an oil injection system of an engine quick start system, which includes a combustion chamber composed of an outer wall of the combustion chamber and an upper cover of the combustion chamber. A hexagonal nozzle for filling the entire combustion chamber with fuel is installed on the side of the outer wall of the combustion chamber. An evaporation tube assembly extending upward into the outer ring inside the combustion chamber is provided at the bottom of the outer wall of the combustion chamber. A high-voltage pulsed igniter and an ignition head are installed on the top surface of the upper cover of the combustion chamber, and an inner abdominal cavity of the combustion chamber extending downward into the inner ring inside the combustion chamber is provided at the bottom surface of the upper cover of the combustion chamber.
[0007] Further, the hexagonal nozzle consists of an oil inlet copper pipe, a return valve, and an oil injection port. The oil inlet copper pipe is connected to the engine oil pump. The return valve is installed on the oil inlet copper pipe and is used to control the fuel volume passing through the oil inlet copper pipe. The oil injection port is installed on the outer wall of the combustion chamber at an angle of 45° obliquely upward.
[0008] Further, a groove is provided obliquely upward on the outer wall of the combustion chamber, and the fuel injection port is installed in the groove.
[0009] Preferably, the wire harness in the high-voltage pulse igniter is in contact connection with the spring in the ignition head. The bottom end of the ignition head is fixed to the upper cover of the combustion chamber by welding, and the tip at the bottom of the ignition head extends into the combustion chamber.
[0010] Optionally, the abdominal cavity inside the combustion chamber is a columnar honeycomb structure and is located at the center of the upper cover of the combustion chamber.
[0011] Further, the evaporation tube assembly includes a plurality of evaporation tubes evenly distributed at circumferential intervals.
[0012] Thus, the fuel injection system of the engine quick start system of the present utility model at least has the following beneficial effects:
[0013] 1. The heating method using the high-pressure nozzle with an inclined installation in the combustion chamber has high efficiency. By arranging the abdominal cavity inside the combustion chamber and the evaporation tube assembly inside the combustion chamber, the heating area is large, the heat propagation is fast, the temperature of the combustion chamber rises quickly, the engine can reach the highest working efficiency faster, and the service life of the engine is increased.
[0014] 2. Through the high-pressure nozzle with an inclined installation in the combustion chamber, 2-3 atmospheres are instantaneously generated to atomize the fuel, which is sprayed onto the blue electric arc generated by the tip discharge of the high-voltage pulse ignition, forming a preheating environment with rapid atomization in the combustion chamber, so that the temperature of the combustion chamber rises rapidly.
[0015] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following is described in detail in combination with the preferred embodiments and accompanied by the drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments will be briefly introduced below.
[0017] Figure 1 It is an exploded view of the fuel injection system of the engine quick start system of the present utility model;
[0018] Figure 2 It is an assembled view of the fuel injection system of the engine quick start system of the present utility model;
[0019] Figure 3 It is a structural view of the hexagonal fuel injection nozzle of the present utility model;
[0020] Figure 4Schematic diagram of the structure of the outer wall of the combustion chamber of the present utility model;
[0021] Figure 5 is Figure 4 the sectional view taken along line A-A in
[0022] Figure 6 Schematic diagram of the structure of the high-voltage pulse igniter and the ignition head of the present utility model installed on the upper cover of the combustion chamber;
[0023] Figure 7 is Figure 6 bottom view of
[0024] In the figure: 10 - high-voltage pulse igniter, 20 - ignition head, 30 - upper cover of the combustion chamber, 40 - inner abdominal cavity of the combustion chamber, 50 - outer wall of the combustion chamber, 51 - groove, 60 - evaporation tube assembly, 70 - hexagonal fuel injector, 71 - oil inlet copper tube, 72 - oil return valve, 73 - fuel injection port. Specific embodiments
[0025] The following will describe in detail the specific embodiments of the present utility model. As a part of this specification, the principles of the present invention are illustrated through examples. Other aspects, features, and advantages of the present utility model will become apparent through this detailed description. In the accompanying drawings referred to, the same or similar components in different figures are denoted by the same reference numerals.
[0026] As Figures 1 to 7 shown, the fuel injection system of the engine quick start system of the present utility model includes a combustion chamber composed of an outer wall 50 of the combustion chamber and an upper cover 30 of the combustion chamber. A hexagonal fuel injector 70 for filling the entire combustion chamber with fuel is installed on the side of the outer wall 50 of the combustion chamber, and an evaporation tube assembly 60 extending upward into the outer ring of the interior of the combustion chamber is provided at the bottom of the outer wall 50 of the combustion chamber. A high-voltage pulse igniter 10 and an ignition head 20 are installed on the top surface of the upper cover 30 of the combustion chamber, and an inner abdominal cavity 40 of the combustion chamber extending downward into the inner ring of the interior of the combustion chamber is provided on the bottom surface of the upper cover 30 of the combustion chamber.
[0027] As Figure 3 shown, the hexagonal fuel injector 70 is composed of an oil inlet copper tube 71, an oil return valve 72, and a fuel injection port 73. The oil inlet copper tube 71 is connected to the engine oil pump, and the oil return valve 72 is installed on the oil inlet copper tube 71 and is used to control the fuel volume passing through the oil inlet copper tube 71. When the fuel in the engine oil pump enters the oil inlet of the oil inlet copper tube 71, it enters the fuel injection port 73 through oil return control. The fuel injection port 73 generates 2 - 3 atmospheres to atomize the fuel and then sprays out the fuel; the oil return valve 72 controls the fuel volume to ensure that the fuel volume sprayed out by the fuel injector remains basically stable, avoiding the phenomenon of flameout due to sudden loading of the fuel volume during the starting stage.
[0028] As Figure 4 andFigure 5 As shown, the hexagonal fuel injector 70 is installed at an angle of 45° obliquely upward. This installation method can make the atomized fuel sprayed by the fuel injector have a larger diffusion area, making it easier for the fuel to fill the entire combustion chamber and facilitating the rapid preheating of the combustion chamber. There is a groove provided obliquely upward on the outer wall 50 of the combustion chamber, and the fuel injection port 73 is installed in the groove 51, so that the fuel injection port 73 is installed on the outer wall 50 of the combustion chamber at an angle of 45° obliquely upward.
[0029] Among them, the shape of the abdominal cavity 40 inside the combustion chamber of the present utility model is a columnar honeycomb structure and is located at the center of the upper cover 30 of the combustion chamber. The main function of the abdominal cavity 40 inside the combustion chamber is to carry out the fuel combustion process. Specifically, it can fully mix the high-pressure air sent by the compressor with the fuel injected by the fuel nozzle and burn under isobaric conditions, converting the chemical energy of the fuel into heat energy, thereby generating high-temperature and high-pressure gas to drive the turbine to rotate and then drive the engine to work.
[0030] The evaporation tube assembly 60 of the present utility model includes a plurality of evaporation tubes evenly distributed at circumferential intervals. Its main functions are, firstly, fuel supply and atomization. The evaporation tubes are responsible for supplying fuel into the combustion chamber and promoting the full mixing and atomization of fuel and high-speed air flow through its special structure (such as corrugated sections, corrugated cavities, etc.) to form a uniform fuel-air mixture; secondly, premixing and pre-evaporation. The evaporation tubes have the characteristics of partial premixing and pre-evaporation, and can carry out a certain degree of mixing and evaporation before the fuel enters the combustion chamber, which helps to improve the combustion efficiency of the fuel.
[0031] As Figure 6 and Figure 7 shown, the wire harness in the high-voltage pulse igniter 10 is in contact connection with the spring in the igniter head 20. The bottom end of the igniter head 20 is fixed to the upper cover 30 of the combustion chamber by laser welding. After the welding of the bottom end of the igniter head 20 is completed, the tip at the bottom of the igniter head 20 extends into the combustion chamber to ensure that the discharge spark of the igniter head 20 can be transmitted into the combustion chamber. When the high-voltage pulse igniter 10 ignites, the current is conducted through the spring on the igniter head 20 to the tip at the bottom of the igniter head 20, and the tip discharges to generate a blue arc, thereby igniting the atomized fuel in the combustion chamber.
[0032] The above is the preferred implementation manner of the present utility model. Of course, the scope of rights of the present utility model cannot be limited thereby. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and changes can still be made, and these improvements and changes are also regarded as the protection scope of the present utility model.
Claims
1. A fuel injection system for an engine quick start system, comprising a combustion chamber composed of a combustion chamber outer wall (50) and a combustion chamber upper cover (30), characterized in that: A hexagonal fuel injection nozzle (70) for filling the entire combustion chamber with fuel is installed on the side of the combustion chamber outer wall (50), and an evaporation tube assembly (60) extending upward into the outer ring of the combustion chamber is provided at the bottom of the combustion chamber outer wall (50); A high-voltage pulse igniter (10) and an ignition head (20) are mounted on the top surface of the combustion chamber upper cover (30), and a combustion chamber belly cavity (40) extending downward into the inner circle of the combustion chamber is disposed on the bottom surface of the combustion chamber upper cover (30).
2. The fuel injection system of the engine quick start system according to claim 1, characterized in that: The hexagonal fuel injection nozzle (70) is composed of a fuel inlet copper tube (71), a fuel return valve (72) and a fuel injection port (73); the fuel inlet copper tube (71) is connected to the engine oil pump; the fuel return valve (72) is mounted on the fuel inlet copper tube (71) and is used to control the amount of fuel passing through the fuel inlet copper tube (71); and the fuel injection port (73) is mounted on the outer wall (50) of the combustion chamber at an angle of 45° upward.
3. The fuel injection system of the engine quick start system as claimed in claim 2, characterized in that: The combustion chamber outer wall (50) is provided with a groove (51) arranged obliquely upward, and the oil injection port (73) is installed in the groove (51).
4. The fuel injection system of the engine quick start system as claimed in claim 1, characterized in that: The wiring harness in the high-voltage pulse igniter (10) is in contact with the spring in the ignition head (20), the bottom end of the ignition head (20) is fixed to the combustion chamber upper cover (30) by welding, and the tip of the bottom of the ignition head (20) extends into the combustion chamber.
5. The fuel injection system of the engine quick start system as claimed in claim 1, characterized in that: The combustion chamber inner cavity (40) is a columnar honeycomb structure and is located at the center of the combustion chamber upper cover (30).
6. The fuel injection system of the engine quick start system as claimed in claim 1, characterized in that: The evaporation tube assembly (60) comprises a plurality of evaporation tubes that are evenly spaced and distributed around a circumference.