CN110792515B - Ignition electric nozzle of high-thrust engine - Google Patents
Ignition electric nozzle of high-thrust engine Download PDFInfo
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- CN110792515B CN110792515B CN201911088383.1A CN201911088383A CN110792515B CN 110792515 B CN110792515 B CN 110792515B CN 201911088383 A CN201911088383 A CN 201911088383A CN 110792515 B CN110792515 B CN 110792515B
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- insulator
- upper insulator
- thrust engine
- step surface
- ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/26—Starting; Ignition
- F02C7/264—Ignition
- F02C7/266—Electric
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/02—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/20—Sparking plugs characterised by features of the electrodes or insulation
- H01T13/34—Sparking plugs characterised by features of the electrodes or insulation characterised by the mounting of electrodes in insulation, e.g. by embedding
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Spark Plugs (AREA)
Abstract
The application provides a high-thrust engine ignition electric nozzle, wherein a ring plate is arranged on the outer ring surface of the middle part of a center electrode (4), an upper insulator coating the center electrode is of a hollow cylinder structure processed by high-alumina porcelain, a step surface is arranged on the inner wall of the upper insulator, and metal nickel is electroplated on the step surface of the inner wall of the upper insulator, so that when the center electrode (4) is installed in an insulator (7), the part of the upper insulator (7) electroplated with the metal nickel is welded with the ring plate of the center electrode (4); a compression spring (10) is arranged between the step surface formed on the outer wall of the upper insulator (7) and the end part of the lower insulator. This application makes insulator ceramic and metal form an organic whole structure through the technique of carrying out the metallization to ceramic surface, has both guaranteed the leakproofness of product, has also guaranteed the intensity of product structure. In addition, a high-temperature alloy spring is added in the product, so that the structure has elasticity, and the impact of ignition and deflagration on the structure is eliminated.
Description
Technical Field
The invention belongs to the technical field of engine ignition electric nozzle processing, and particularly relates to a high-thrust engine ignition electric nozzle.
Background
The ceramic edge ignition electric nozzle is a product which uses the insulator ceramic edge as a medium to cause high voltage electricity to break down the air between the central electrode 4 and the side electrode 1 to generate electric spark to ignite oil-gas mixed gas in a combustion chamber of an engine.
As shown in fig. 1, a lower case 3 and an upper case 8 are welded together, side electrodes 1 are pressed into the bottom of the lower case 3, a lower insulator 2 is installed, a center electrode 4 is inserted into the lower insulator 2, glass frit 5 is filled, the glass frit is heated to melt and then compacted by an upper insulator 7, a contact cap 6 is inserted into the center electrode 4 to be connected by argon arc welding, and finally a gasket 9 is installed and a rear seam of the case 8 is closed.
The thrust of the high-thrust engine reaches 13-16 tons, and compared with the existing engine (the thrust is 4-6 tons), the high-thrust engine has the advantages that the temperature of a combustion chamber is higher, the air flow pressure is higher, and the flow speed is higher. The ignition electric nozzle is arranged in a combustion chamber of an engine and has the function of igniting oil-gas mixed gas in the combustion chamber of the engine, so that the working environment of the ignition electric nozzle of the high-thrust engine is quite severe. The front end of the ignition electric nozzle has the use temperature of 1100 ℃ and the maximum pressure (air pressure) of 4.2 MPa. The ignition electric nozzle processed by the prior art has the temperature resistance of no more than 800 ℃ and the pressure resistance of no more than 2.45MPa, and can not meet the use requirement of a high-thrust engine.
The prior art has the following defects which are difficult to avoid:
a) the gas-tight index of the product is not easy to guarantee under the pressure of 4.2MPa in the combustion chamber, the glass frit powder is required to be completely melted and completely bonded with metal to guarantee the sealing property, and the sealing is difficult to guarantee that the product is gas-tight under the pressure because the thermal expansion coefficients of the glass cement and the metal are inconsistent;
b) when the use temperature of the front section of the product reaches above 800 ℃, the glass cement can be softened to cause air leakage;
c) the discharge end of the ceramic creeping discharge electric nozzle is generally of a concave structure, sparks generated by discharge can be ejected out of the end face by about 1 cm, but the impact force on the electric nozzle structure is also very large, and the insulator part is easy to crack due to impact in the prior art and the structural part is fixed, so that the product fails;
d) the welding of the contact cap and the central electrode leads to the generation of welding beading on the surface of the contact cap, so that the contact resistance between the contact cap and the ignition cable is increased, and the product performance is influenced.
Disclosure of Invention
In order to solve at least one of the above technical problems, the application provides a high thrust engine ignition electric nozzle for solving the problem that the prior art can not meet the technical requirements of the high thrust engine ignition electric nozzle.
This application high thrust engine ignition electric nozzle includes side electrode, insulator, lower casing, central electrode, goes up the insulator, goes up the casing down, side electrode and insulator installation are in the casing down, go up the insulator and install in last casing, go up casing and lower casing welding, and central electrode installs in the barrel that last insulator and insulator form down, wherein:
a ring plate is arranged on the outer ring surface of the middle part of the central electrode, the upper insulator is of a hollow cylinder structure processed by high alumina porcelain, a step surface is arranged on the inner wall of the upper insulator, a first part with a relatively small inner diameter and a second part with a relatively large inner diameter are formed, and the step surface of the upper insulator and the contact part of the second part, which is connected with the step surface, are both electroplated with metallic nickel, so that when the central electrode is installed in the insulator, the part, which is electroplated with metallic nickel, of the upper insulator is welded with the ring plate of the central electrode;
an outer step surface is formed on the outer wall of the first part and the second part of the upper insulator, the lower insulator comprises a section of overlap joint part with a larger inner diameter and used for surrounding the first part of the upper insulator, and a compressed spring is arranged between the end surface of the overlap joint part and the outer step surface of the upper insulator.
Preferably, the spring is a cylindrical spring, and is sleeved outside the cylinder of the first part of the upper insulator.
Preferably, an end of the upper housing remote from the lower housing is provided with an external thread for connection with an ignition cable.
Preferably, a fixed end with a reduced outer diameter is formed on an outer circumferential surface of an end of the upper insulator, which is away from the lower insulator, and an annular groove is formed between the fixed end and an inner wall of the upper housing, and a bushing is installed in the annular groove.
Preferably, the fixed end of the upper insulator is plated with metallic nickel for welding with the bushing.
Preferably, the upper insulator is fixedly coupled to the center electrode and the bushing, and then is installed in the upper case.
Preferably, after the insulator is fixedly connected to the center electrode and the bushing, gas leakage is detected under a pressure of 4.2 MPa.
This application makes insulator ceramic and metal form an organic whole structure through the technique of carrying out the metallization to ceramic surface, has both guaranteed the leakproofness of product, has also guaranteed the intensity of product structure. In addition, a high-temperature alloy spring is added in the product, so that the structure has elasticity, and the impact of ignition and deflagration on the structure is eliminated. The ignition electric nozzle of the high-thrust engine developed by the application has high sealing qualification rate and good structural stability and manufacturability, and meets the complex high-temperature and high-pressure working conditions of the high-thrust engine.
Drawings
Fig. 1 is a schematic view of a conventional ignition torch.
Fig. 2 is a schematic structural view of an ignition torch according to an embodiment of the present application.
Wherein, 1-side electrode, 2-lower insulator, 3-lower shell, 4-center electrode, 5-frit powder, 6-contact cap, 7-upper insulator, 8-upper shell, 9-washer, 10-spring, 11-bushing, 71-step surface, 72-contact part, 73-fixed end.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.
The ignition electric nozzle of the high-thrust engine requires that a product does not leak air under the air pressure of 4.2MPa, the ignition electric nozzle is positioned at the ignition end part in the flame tube, the highest working environment temperature is 1100 ℃, the ignition electric nozzle is positioned at the part in the two runners of the combustion chamber, the highest working environment temperature is 600 ℃, and the ignition energy is not less than 3.8J. The invention aims to solve the problem that the prior art cannot meet the technical requirements of the ignition nozzle of a high-thrust engine.
The invention provides an ignition electric nozzle of a high-thrust engine, which mainly comprises the following components as shown in figure 2: side electrode 1, lower insulator 2, lower casing 3, central electrode 4, upper insulator 7, upper casing 8, side electrode 1 and lower insulator 2 are installed in lower casing 3, upper insulator 7 is installed in upper casing 8, upper casing 8 and lower casing 3 are welded, central electrode 4 is installed in the barrel that upper insulator 7 and lower insulator 2 formed, wherein:
a ring plate is arranged on the outer ring surface of the middle part of the central electrode 4, the upper insulator 7 is a hollow cylinder structure processed by high alumina porcelain, a step surface 71 is arranged on the inner wall of the upper insulator, a first part with a relatively small inner diameter and a second part with a relatively large inner diameter are formed, and metal nickel is electroplated on the step surface 71 of the upper insulator 7 and a contact part 72 of the second part, which is connected with the step surface 71, so that when the central electrode 4 is installed in the insulator 7, the part of the upper insulator 7, which is electroplated with the metal nickel, is welded with the ring plate of the central electrode 4;
an outer step surface is formed on the outer wall of the first part and the second part of the upper insulator 7, the lower insulator 2 comprises a section of overlap part with a larger inner diameter and used for surrounding the first part of the upper insulator 7, and a compressed spring 10 is arranged between the end surface of the overlap part and the outer step surface of the upper insulator 7.
The idea of the invention is to abandon the traditional structure of ensuring the product sealing performance by using glass sealant, and form an integrated structure of insulator ceramic and metal by a technology of metalizing the ceramic surface, thereby ensuring the product sealing performance and the product structure strength. In addition, a high-temperature alloy spring is added in the product, so that the structure has elasticity, and the impact of ignition and deflagration on the structure is eliminated. Specifically, as shown in fig. 2, the lower insulator 2 and the upper insulator 7 highly insulate the center electrode 4 from the lower shell 2, the lower shell 8 and the side electrode 1, the ignition torch discharges by the front end surface of the insulator 2, the side electrode 1 is made of a disc-shaped corrosion-resistant and oxidation-resistant metal, and the center electrode 4 is integrally formed by combining the center electrode 4 and the contact cap 6 in the prior art, and is integrally machined to make the connection surface with the ignition cable flat and smooth. The lower insulator 2 and the upper insulator 7 are cylindrical parts processed by high alumina porcelain, and have the function of highly insulating the center electrode 4 from the lower shell 3, the upper shell 5 and the side electrodes 1. The lower shell 3 is a high-temperature-resistant metal cylinder, and the shape interface is matched with an engine; the upper shell is a sealing alloy metal cylinder, the shape of the upper shell is provided with threads to be connected with an ignition cable, and the inner hole is plated with nickel to facilitate brazing. The spring 10 is a cylindrical spring made of high-temperature alloy, and elastic connection is guaranteed at high temperature. The bush 11 is a metal circular tube of sealing alloy.
The invention is characterized in that the internal structure of an upper insulator 7 is made into a platform, and ceramic metallization treatment is carried out on the platform (step surface 71), an inner hole (contact part 72) and the upper part of an excircle (fixed end 73) of the upper insulator 7, so that the surface of the insulator is plated with a layer of metallic nickel. The center electrode 4 and the bush 11 are first installed in the upper insulator 7, then installed in the case 8, positioned by a tool, and brazed, after checking that no gas is leaked under a pressure of 4.2MPa, the side electrode 1 is pressed into the bottom of the lower case 3, then the lower insulator 2 and the spring 5 are installed, the brazed assembly is inserted into the lower insulator 2, and the product is assembled after the upper case 8 and the lower case 3 are welded.
The ignition electric nozzle of the high-thrust engine developed according to the invention has high sealing qualification rate, stable structure and good manufacturability. The central electrode and the contact cap are integrally processed, and no welding beading exists on the central electrode and the contact cap, so that the ignition nozzle is in good contact with the ignition cable, and the flashover is not easy to generate under the high voltage of 18kV to influence the discharge performance of the product. The high-temperature alloy spring can resist the temperature of 800 ℃, the use temperature of the high-temperature alloy spring at the position of the electric nozzle is up to 600 ℃, the elasticity performance at high temperature can be ensured, and the phenomenon that the lower insulator 2 is impacted to generate cracks so as to influence the discharge performance is avoided. The brazing is sealed at the rear part of the electric nozzle, the temperature is 220-600 ℃, the melting point of the selected silver brazing solder is 860 ℃, and the use requirement can be met. The invention adopts a new method and a new structure to realize the sealing of the electric nozzle at the rear part of the electric nozzle with lower temperature, thereby meeting the complex high-temperature and high-pressure working conditions of a high-thrust engine.
The ignition nozzle product of the engine of the large-scale transport plane developed according to the scheme of the invention has stable performance since the development, and has no fault in the test run and the test flight in the field. The shape and the length of the insulator can be adjusted according to different shapes required by the ignition nozzle.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. The utility model provides a high thrust engine ignition electric nozzle, includes side electrode (1), lower insulator (2), lower casing (3), central electrode (4), goes up insulator (7), goes up casing (8), side electrode (1) and lower insulator (2) are installed in lower casing (3), goes up insulator (7) and installs in last casing (8), goes up casing (8) and lower casing (3) welding, and central electrode (4) are installed in the barrel that last insulator (7) and lower insulator (2) formed, its characterized in that:
a ring plate is arranged on the outer ring surface of the middle part of the central electrode (4), the upper insulator (7) is of a hollow cylinder structure processed by high alumina porcelain, a step surface (71) is arranged on the inner wall of the upper insulator, a first part with a relatively small inner diameter and a second part with a relatively large inner diameter are formed, metal nickel is electroplated on the step surface (71) of the upper insulator (7) and a contact part (72) of the second part, which is connected with the step surface (71), and when the central electrode (4) is installed in the upper insulator (7), the part of the upper insulator (7) which is electroplated with the metal nickel is welded with the ring plate of the central electrode (4);
an outer step surface is formed on the outer wall of the first part and the second part of the upper insulator (7), the lower insulator (2) comprises a section of overlapping part with a larger inner diameter and used for surrounding the first part of the upper insulator (7), and a compressed spring (10) is arranged between the end surface of the overlapping part and the outer step surface of the upper insulator (7).
2. The high thrust engine ignition nozzle according to claim 1, characterized in that said spring (10) is a cylindrical spring, which is sleeved outside the cylinder of said first portion of said upper insulator (7).
3. Ignition nozzle of high thrust engine according to claim 1, characterized in that the end of said upper housing (8) remote from said lower housing (3) is provided with an external thread for connection with an ignition cable.
4. The ignition nozzle of high thrust engine according to claim 1, wherein the end of said upper insulator (7) remote from said lower insulator (2) is formed with a fixing end (73) having a reduced outer diameter on the outer circumferential surface thereof, and said fixing end is formed with a ring groove between the fixing end and the inner wall of said upper housing (8), said ring groove being fitted with a bushing (11).
5. The high thrust engine ignition nozzle as defined in claim 4, wherein the fixed end (73) of said upper insulator (7) is plated with metallic nickel for welding with said bushing (11).
6. The high-thrust engine ignition nozzle as defined in claim 5, wherein the upper insulator (7) is fixedly attached to the center electrode (4) and the bushing (11), and then is installed in said upper housing (8).
7. The ignition nozzle of high-thrust engine according to claim 5, characterized in that the upper insulator (7) is fixedly connected with the center electrode (4) and the bushing (11), and then the air leakage detection is performed under the air pressure of 4.2 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911088383.1A CN110792515B (en) | 2019-11-08 | 2019-11-08 | Ignition electric nozzle of high-thrust engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911088383.1A CN110792515B (en) | 2019-11-08 | 2019-11-08 | Ignition electric nozzle of high-thrust engine |
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| Publication Number | Publication Date |
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| CN110792515A CN110792515A (en) | 2020-02-14 |
| CN110792515B true CN110792515B (en) | 2022-05-06 |
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| CN201911088383.1A Active CN110792515B (en) | 2019-11-08 | 2019-11-08 | Ignition electric nozzle of high-thrust engine |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377310B (en) * | 2020-11-13 | 2022-08-16 | 四川泛华航空仪表电器有限公司 | Aeroengine ignition electric nozzle device of selfreparing |
| CN112377309B (en) * | 2020-11-13 | 2022-09-13 | 四川泛华航空仪表电器有限公司 | Repairable aeroengine ignition electric nozzle device |
| CN114284816B (en) * | 2021-12-13 | 2024-05-03 | 陕西航空电气有限责任公司 | Adapter for aeroengine ignition system |
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| FR590663A (en) * | 1924-04-04 | 1925-06-20 | Removable spark plug, with insulation in several parts held on the body of the spark plug by means of the central electrode | |
| CN2399866Y (en) * | 1999-10-23 | 2000-10-04 | 吕秋海 | Sparking plug |
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| CN110792515A (en) | 2020-02-14 |
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