Carbon deposition prevention structure of aviation torch ignition electrode

Abstract

The application belongs to the field of ignition of aviation and aerospace engines, and particularly relates to a carbon deposition prevention structure of an aviation torch ignition electrode, which comprises a shell, an insulator, a center oil pipe, a nozzle, a center electrode and a side electrode, the shell side wall is provided with an oil pipe joint and a gas pipe joint respectively, the center oil pipe is sleeved on the inside of the shell through the insulator, the insulator is provided with passages for connecting the gas pipe joint and the center oil pipe and the oil pipe joint and the center oil pipe, the center oil pipe is provided with the nozzle at the tail end, the nozzle outlet is sleeved with a cylindrical center electrode, the center electrode is provided with a cylindrical side electrode at the outer gap, the side electrode is installed on the shell, and the center electrode and the side electrode are connected to different electrodes respectively; during ignition, the oil circuit is opened, the gas circuit is closed, fuel enters the center oil pipe through the oil pipe joint, and then the fuel is sprayed in the form of oil mist through the nozzle, and the center electrode and the side electrode emit electric sparks to ignite the oil mist sprayed by the nozzle; after the engine speed is stabilized, the gas in the duct is introduced into the oil circuit to remove the oil accumulated in the oil circuit.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of ignition of aviation and aerospace engines, and particularly relates to a carbon deposition prevention structure of an aviation torch ignition electrode. BACKGROUND

[0002] The torch ignition electrode is used for flowing fuel from a pipe joint into the inside of a torch electrode shell at a pressure of 0.392 MPa, accelerating the fuel through a center oil pipe and a threaded oil filter special thread, and then spraying the fuel out of a nozzle to form an atomization cone angle, and finally spraying the oil mist out of three windows of a center electrode and a side electrode. Under the action of an electric spark between the center electrode and the side electrode, a torch is formed.

[0003] During use, fuel is deposited on a swirl groove of the electrode, and the fuel is carbonized in a high-temperature environment of the engine to block the oil path, causing failure of the electrode. SUMMARY

[0004] To solve the above problems, the application provides a carbon deposition prevention structure of an aviation torch ignition electrode, which comprises:

[0005] a shell, an insulator, a center oil pipe, a nozzle, and a center electrode and a side electrode;

[0006] The shell has an oil pipe joint and an air pipe joint on a side wall, the center oil pipe is sleeved on the inside of the shell through the insulator, the insulator has passages for connecting the air pipe joint and the center oil pipe and the oil pipe joint and the center oil pipe, the center oil pipe is provided with the nozzle at a distal end, the nozzle is sleeved with a cylindrical center electrode at an outlet, the center electrode is provided with a cylindrical side electrode at an outer gap, the side electrode is installed on the shell, and the center electrode and the side electrode are connected to different electrodes, respectively.

[0007] During ignition, the oil path is opened, the air path is closed, fuel enters the center oil pipe through the oil pipe joint, and then the fuel mist is sprayed out of the nozzle, and an electric spark is generated between the center electrode and the side electrode to ignite the fuel mist sprayed out of the nozzle.

[0008] After ignition is completed, the oil path is closed, the air path is opened, and the air pipe joint blows air to blow off residual oil of the ignition electrode.

[0009] Preferably, a swirl device is installed at a front end of the nozzle, and the swirl device has a threaded oil filter swirl groove.

[0010] Preferably, the minimum air pressure of the air pipe joint is 0.04 MPa, the optimal aperture of the nozzle is mm, and the optimal depth of a tooth shape of a special thread of the threaded oil filter swirl groove is 0.48 mm.

[0011] Preferably, the air pipe joint uses air in an engine duct.

[0012] Preferably, the center electrode is powered through the center oil pipe connected thereto, and the side electrode is powered through the shell.

[0013] Preferably, the front end of the center oil pipe is provided with a conductive nail, one end of the conductive nail abuts against the boss of the insulator, and the other end abuts against the center oil pipe through a conductive elastic washer. When the cable joint is screwed with the shell, the electrode of the cable is pressed on the conductive nail, and the conductive elastic washer is compressed.

[0014] The advantages of the present application include: after the engine speed is stabilized, the gas in the duct is introduced into the oil circuit to remove the accumulated oil in the oil circuit, and by determining the sizes of the gas pressure, the size of the electric nozzle, the thread depth of the cyclone groove, etc., the flow rate of the gas flow is made faster, and at the same time, the flow rate when the fuel flows through is ensured, so as to achieve the effect of preventing carbon deposition. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a schematic diagram of the anti-carbon deposition structure of the aviation torch ignition electric nozzle of a preferred embodiment of the present application;

[0016] Fig. 2 is a partial schematic diagram of the nozzle of the aviation torch ignition electric nozzle of a preferred embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in more detail below in combination with the drawings of the embodiments of the present application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below in combination with the drawings.

[0018] As Figs. 1-2 shown, in order to solve the above problems, the present application provides an aviation torch ignition electric nozzle anti-carbon deposition structure, comprising:

[0019] a shell, an inner insulator 3 and an outer insulator 2, a center oil pipe 4, a nozzle 6, and a center electrode 9 and a side electrode 5;

[0020] The oil pipe joint 1 and the air pipe joint 2 are arranged on the side wall of the shell respectively, the center oil pipe 4 is sleeved on the inner side of the shell through an insulator, the insulator has a passage connecting the air pipe joint 2 and the center oil pipe 4 and the oil pipe joint 1 and the center oil pipe 4; the end of the center oil pipe 4 is provided with a nozzle 6, the front end of the nozzle 6 is provided with a cyclone 8, the cyclone 8 has a threaded oil filter cyclone groove; the nozzle 6 is sleeved with a cylindrical center electrode 9 at the outlet, the outer gap of the center electrode 9 is provided with a cylindrical side electrode 5, the side electrode 5 is arranged on the shell, and the center electrode 9 and the side electrode 5 are connected with different electrodes respectively;

[0021] When ignition, the oil circuit is opened, the air circuit is closed, the fuel enters the center oil pipe 4 through the oil pipe joint 1, and then the oil mist is sprayed out through the nozzle 6, and the electric spark is generated between the center electrode 9 and the side electrode 5 to ignite the oil mist sprayed out by the nozzle 6;

[0022] When the ignition is completed, the oil circuit is closed, the air circuit is opened, and the air pipe joint 2 blows air to blow off the residual oil of the ignition nozzle;

[0023] Preferably, the air of the air pipe joint 2 adopts the air in the engine duct, the minimum air pressure of the air pipe joint 2 is 0.04 Mpa, the best nozzle aperture is 0.50-0.55 mm, and the best depth of the special thread of the threaded oil filter cyclone groove is 0.48 mm.

[0024] The data acquisition method comprises the following steps: in the process of engine operation, the efficiency of blowing off the accumulated carbon is related to the air flow rate, according to Bernoulli equation, under the condition of a certain pressure difference, the air flow rate is inversely proportional to the outlet area, therefore, the increase of the size of the nozzle small hole reduces the air flow rate, thereby reducing the efficiency of blowing off the accumulated carbon.

[0025] 1. Under the existing air pressure of 0.01-0.04 Mpa, the pressure is gradually reduced by 0.01 Mpa as a step, each pressure point is kept for 20 hours at 320 DEG C, whether there is accumulated carbon coking is checked, and the minimum air pressure is determined to be 0.04 Mpa.

[0026] 2. After the minimum air pressure is determined, the nozzle tolerance size is matched under 0.04 Mpa, whether the fuel can be blown clean is checked every 2 min until it is blown clean, whether it is blown clean is checked, and the best nozzle aperture is determined to be 0.50-0.55 mm.

[0027] 3. The fuel flow of the nozzle is matched again: the fuel flows into the torch ignition nozzle shell through the torch ignition nozzle pipe joint from the engine oil pipe, passes through the center oil pipe assembly inner cavity, the threaded oil filter special thread, and then is accelerated through the threaded oil filter cyclone groove, passes through the nozzle cone angle in the cyclone chamber, and is sprayed out through the small hole to form a hollow cone. The flow is related to the tooth depth of the special thread of the threaded oil filter, the nozzle aperture and other factors. The tooth depth of the special thread is matched with the best nozzle aperture of 0.50-0.55 mm, and the best depth of the tooth of the special thread is determined to be 0.48 mm.

[0028] Preferably, the center electrode 9 is supplied with power through the center oil pipe 4 connected thereto, and the side electrode 5 is supplied with power through the housing, the center oil pipe 4 is provided at the front end thereof with a conductive nail, one end of the conductive nail abuts against the boss of the insulator, and the other end abuts against the center oil pipe 4 through the conductive elastic washer 7, when the cable joint is screwed with the housing, the electrode of the cable is pressed against the conductive nail, and the conductive elastic washer 7 is compressed.

[0029] In order to improve the anti-carbon deposition capacity of the ignition electrode, the oil path is introduced into the gas path, and the high-pressure pulse electric energy provided by the ignition device and the high-pressure fuel provided by the micro pump are accepted by the ignition electrode during the engine starting process. The electric spark ignites the atomized fuel at the nozzle to produce a flame, and at the same time, the electric fuel switch is opened, and the fuel pumped by the main fuel pump in the fuel regulator is thrown into the combustion chamber by the oil throwing disc and ignited by the flame formed by the ignition electrode. After the engine speed is stabilized, the gas in the duct is introduced into the oil path to remove the oil accumulated in the oil path, and the gas flow speed is determined by the gas pressure, the size of the electrode nozzle, the thread depth of the cyclone groove, etc. The flow rate is faster, and at the same time, the flow rate of the fuel is ensured, so as to prevent carbon deposition.

[0030] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A carbon-prevention structure for an aviation torch ignition nozzle, characterized in that, include: The housing, insulator, central oil pipe (4), nozzle (6), and central electrode (9) and side electrode (5); The side wall of the shell has an oil pipe joint (1) and an air pipe joint (2) respectively. The central oil pipe (4) is sleeved inside the shell through an insulator. The insulator has a passage connecting the air pipe joint (2) and the central oil pipe (4), and the oil pipe joint (1) and the central oil pipe (4). A nozzle (6) is provided at the end of the central oil pipe (4). A cylindrical central electrode (9) is sleeved at the outlet of the nozzle (6). A cylindrical side electrode (5) is provided in the gap outside the central electrode (9). The side electrode (5) is installed on the shell. The central electrode (9) and the side electrode (5) are connected to different electrodes respectively. When ignited, the oil circuit is opened and the air circuit is closed. Fuel enters the central oil pipe (4) through the oil pipe joint (1) and then sprays out oil mist through the nozzle (6). An electric spark is generated between the central electrode (9) and the side electrode (5) to ignite the oil mist sprayed out by the nozzle (6). After ignition is completed, the oil circuit is closed and the gas circuit is opened. The gas pipe connector (2) blows out the residual oil in the ignition nozzle. The central electrode (9) is powered through the central oil pipe (4) connected to it, and the side electrode (5) is powered through the housing; A conductive pin is provided at the front end of the central oil pipe (4). One end of the conductive pin abuts against the protrusion of the insulator, and the other end abuts against the central oil pipe (4) through a conductive elastic washer (7). When the cable connector is threadedly connected to the shell, the cable electrode presses on the conductive pin and compresses the conductive elastic washer (7).

2. The anti-carbon buildup structure for the aviation torch ignition nozzle as described in claim 1, characterized in that, The nozzle (6) is equipped with a hydrocyclone (8) at the front end, and the hydrocyclone (8) has a threaded oil filter swirling groove.

3. The anti-carbon buildup structure for the aviation torch ignition nozzle as described in claim 2, characterized in that, The minimum air pressure of the air pipe connector (2) is 0.04 MPa, the nozzle orifice diameter is 0.50 to 0.55 mm, and the tooth depth of the special thread of the threaded oil filter vortex groove is 0.48 mm.

4. The anti-carbon buildup structure for the aviation torch ignition nozzle as described in claim 1, characterized in that, The air supply to the air pipe connector (2) is engine duct gas.

Images