Combined sealed ignition electric nozzle

Abstract

The utility model belongs to the field of ignition systems of gas turbines, and particularly relates to a combined and sealed ignition electric nozzle. Comprising a glass sealing assembly and a brazing sealing assembly, the glass sealing assembly comprises an ignition nozzle, a first insulating tube, a fixing nut, sealing glass, a second insulating tube, a central electrode and a lining, and the central electrode is sleeved with the first insulating tube which is fixed through threads of the fixing nut; the front conical surface of the first insulating tube is attached to the inner conical surface of the ignition nozzle; the bushing and the central electrode are welded and fixed to form a glass sealing assembly, the brazing sealing assembly comprises a shell, a sealing wire, a third insulating tube and a sealing sleeve, the third insulating tube is sleeved with the sealing sleeve, the sealing wire is lapped in an inner hole of the third insulating tube, and a bonding surface is brazed and sealed; the sealing sleeve and the shell are welded and fixed to form a brazing sealing assembly; and the ignition nozzle and the shell are welded and fixed. The problem that a single sealing structure of the ignition electric nozzle often leaks air is solved, and the use requirement for long service life of the ignition electric nozzle of the gas turbine is met.

Description

Technical Field

[0001] This invention belongs to the field of gas turbine ignition systems, and specifically relates to a combined sealed ignition nozzle. Background Technology

[0002] The ignition nozzle is a crucial component of a gas turbine, used to convert high-voltage pulse electricity into an electric spark to ignite fuel within the combustion chamber. Mounted on the engine casing, the nozzle's end is located within the combustion chamber and operates under high temperatures for extended periods. Current ignition nozzles typically employ a single-seal structure—either glass-sealed or ceramic-metallized brazed—to achieve a seal between the central conductor and the housing. However, this seal is prone to failure after prolonged operation at high temperatures. Summary of the Invention

[0003] Purpose of the utility model: To provide a combined-seal ignition nozzle to solve the problem that a single sealing structure is prone to failure after long-term operation in a high-temperature environment.

[0004] Technical solution:

[0005] A combined sealed ignition nozzle includes: a glass sealing assembly and a brazing sealing assembly. The glass sealing assembly includes: an igniter 1, a first insulating tube 2, a fixing nut 3, a sealing glass 4, a second insulating tube 5, a center electrode 6, and a bushing 7. The brazing sealing assembly includes a housing 8, a sealing wire 9, a third insulating tube 10, and a sealing sleeve 11.

[0006] The first insulating tube 2, the fixing nut 3, the sealing glass 4, the second insulating tube 5, and the bushing 7 are sequentially fitted onto the central electrode 6. The first insulating tube 2 is placed inside the ignition nozzle 1, with the front conical surface of the first insulating tube 2 in contact with the inner conical surface of the ignition nozzle 1. The first insulating tube 2 is fixed by the fixing nut 3. One end of the bushing 7 is in contact with the second insulating tube 5, and the other end of the bushing 7 is welded and fixed to the central electrode 6 to form a glass sealing assembly.

[0007] The sealing sleeve 11 is fitted onto the third insulating tube 10. The sealing sleeve 11 and the third insulating tube 10 are brazed to seal their circumferential mating surfaces by the step limit of the third insulating tube 10. The sealing wire 9 overlaps in the inner hole of the third insulating tube 10, and the overlapping surface is brazed to seal. The sealing sleeve 11 and the housing 8 are welded to form a brazed sealing assembly. The igniter 1 and the housing 8 are fixed by welding, and the end face of the sealing wire 9 and the end face of the center electrode 6 are welded to achieve a combined sealing structure of glass sealing and brazed sealing.

[0008] Furthermore, the sealing glass 4 is sintered at a high temperature of 960℃ and bonded to the igniter 1 and the central electrode 6 to achieve a seal; the sealing glass 4 is DM-308 glass, which can ensure good airtightness in an environment with a high temperature of 800℃ and a high pressure of 3Mpa.

[0009] Furthermore, the third insulating tube 10 is made of alumina ceramic material, and a metallized coating is provided on the outer surface of the junction of the third insulating tube 10 with the sealing sleeve 11 and the sealing wire 9.

[0010] Furthermore, the circumferential mating surfaces of the sealing sleeve 11 and the third insulating tube 10 are welded by placing a strip of solder, and the overlapping surfaces of the sealing wire 9 and the third insulating tube 10 are welded by placing an annular solder; the solder is a palladium-nickel alloy strip.

[0011] Furthermore, the brazing sealing assembly is welded at a temperature of 1300℃, and after welding, the brazing sealing assembly can guarantee reliable airtightness in an environment with a high temperature of 1000℃ and a high pressure of 3MPa.

[0012] Furthermore, the glass sealing assembly and the brazing sealing assembly are connected in series. The glass sealing assembly is placed in the combustion chamber and serves as the first seal. When the airtightness of the glass sealing assembly fails, the brazing sealing assembly acts as the second seal, ensuring the efficient sealing of the ignition nozzle.

[0013] Beneficial effects:

[0014] This invention solves the problem of air leakage that often occurs in the single-seal structure of the ignition nozzle, and meets the long service life requirements of the gas turbine ignition nozzle. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of a combined-seal ignition nozzle according to the present invention;

[0016] Figure 2 This is a cross-sectional view of the glass sealing assembly of this utility model;

[0017] Figure 3 This is a cross-sectional view of the brazed sealing assembly of this utility model;

[0018] The components include: 1. igniter nozzle; 2. first insulating tube; 3. fixing nut; 4. sealing glass; 5. second insulating tube; 6. center electrode; 7. bushing; 8. housing; 9. sealing wire; 10. third insulating tube; and 11. sealing sleeve. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. 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 only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] like Figure 1-3 This utility model discloses a combined sealed ignition nozzle, comprising: a glass sealing assembly and a brazing sealing assembly. The glass sealing assembly includes: an igniter 1, a first insulating tube 2, a fixing nut 3, a sealing glass 4, a second insulating tube 5, a center electrode 6, and a bushing 7. The brazing sealing assembly includes a housing 8, a sealing wire 9, a third insulating tube 10, and a sealing sleeve 11.

[0022] The first insulating tube 2, the fixing nut 3, the sealing glass 4, the second insulating tube 5, and the bushing 7 are sequentially fitted onto the central electrode 6. The first insulating tube 2 is placed inside the ignition nozzle 1, with the front conical surface of the first insulating tube 2 in contact with the inner conical surface of the ignition nozzle 1. The first insulating tube 2 is fixed by the fixing nut 3. One end of the bushing 7 is in contact with the second insulating tube 5, and the other end of the bushing 7 is welded and fixed to the central electrode 6 to form a glass sealing assembly.

[0023] The sealing sleeve 11 is fitted onto the third insulating tube 10. The sealing sleeve 11 and the third insulating tube 10 are brazed to seal their circumferential mating surfaces by the step limit of the third insulating tube 10. The sealing wire 9 overlaps in the inner hole of the third insulating tube 10, and the overlapping surface is brazed to seal. The sealing sleeve 11 and the housing 8 are welded to form a brazed sealing assembly. The igniter 1 and the housing 8 are fixed by welding, and the end face of the sealing wire 9 and the end face of the center electrode 6 are welded to achieve a combined sealing structure of glass sealing and brazed sealing.

[0024] The sealing glass 4 is sintered at a high temperature of 960℃ and bonded to the igniter 1 and the center electrode 6 to achieve a seal; the sealing glass 4 is DM-308 glass, which can ensure good airtightness in an environment with a high temperature of 800℃ and a high pressure of 3Mpa.

[0025] The third insulating tube 10 is made of alumina ceramic material, and a metallized coating is provided on the outer surface of the joint between the third insulating tube 10 and the sealing sleeve 11 and the sealing wire 9.

[0026] The circumferential mating surfaces of the sealing sleeve 11 and the third insulating tube 10 are welded by placing a strip of solder, and the overlapping surfaces of the sealing wire 9 and the third insulating tube 10 are welded by placing an annular solder; the solder is a palladium-nickel alloy strip.

[0027] The brazing sealing assembly is welded at a temperature of 1300℃. After welding, the brazing sealing assembly can guarantee reliable airtightness in an environment with a high temperature of 1000℃ and a high pressure of 3MPa.

[0028] The glass sealing assembly and the brazing sealing assembly are connected in series. The glass sealing assembly is placed in the combustion chamber and serves as the first seal. When the airtightness of the glass sealing assembly fails, the brazing sealing assembly acts as the second seal, ensuring the efficient sealing of the ignition nozzle.

[0029] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A combined sealed ignition nozzle, characterized in that, include: The glass sealing assembly and the brazing sealing assembly are provided. The glass sealing assembly includes: a igniter (1), a first insulating tube (2), a fixing nut (3), a sealing glass (4), a second insulating tube (5), a center electrode (6), and a bushing (7). The brazing sealing assembly includes a housing (8), a sealing wire (9), a third insulating tube (10), and a sealing sleeve (11). The first insulating tube (2), the fixing nut (3), the sealing glass (4), the second insulating tube (5), and the bushing (7) are sequentially fitted onto the center electrode (6). The first insulating tube (2) is placed inside the ignition nozzle (1), and the front conical surface of the first insulating tube (2) is in contact with the inner conical surface of the ignition nozzle (1). The first insulating tube (2) is fixed by the fixing nut (3). One end of the bushing (7) is in contact with the second insulating tube (5), and the other end of the bushing (7) is welded to the center electrode (6) to form a glass sealing assembly. The sealing sleeve (11) is fitted onto the third insulating tube (10), and the sealing sleeve (11) and the third insulating tube (10) are brazed to seal the circumferential mating surfaces through the step limit of the third insulating tube (10); the sealing wire (9) overlaps in the inner hole of the third insulating tube (10), and the overlapping surface is brazed to seal; the sealing sleeve (11) and the shell (8) are welded to form a brazed sealing assembly; the igniter (1) and the shell (8) are fixed by welding, and the end face of the sealing wire (9) and the end face of the center electrode (6) are welded to achieve a combined sealing structure of glass sealing and brazed sealing.

2. The combined sealed ignition nozzle according to claim 1, characterized in that, The sealing glass (4) is sintered at 960℃ and bonded to the igniter (1) and the center electrode (6) to achieve a seal; the sealing glass (4) is DM-308 glass, which can ensure good airtightness in an environment with a high temperature of 800℃ and a high pressure of 3Mpa.

3. The combined sealed ignition nozzle according to claim 1, characterized in that, The third insulating tube (10) is made of alumina ceramic material, and a metallized coating is provided on the outer surface of the joint between the third insulating tube (10) and the sealing sleeve (11) and the sealing wire (9).

4. The combined sealed ignition nozzle according to claim 1, characterized in that, The circumferential mating surfaces of the sealing sleeve (11) and the third insulating tube (10) are welded by placing a strip of solder, and the overlapping surfaces of the sealing wire (9) and the third insulating tube (10) are welded by placing an annular solder; the solder is a palladium-nickel alloy strip.

5. The combined sealed ignition nozzle according to claim 3, characterized in that, The brazing sealing assembly is welded at a temperature of 1300℃. After welding, the brazing sealing assembly can guarantee reliable airtightness in an environment with a high temperature of 1000℃ and a high pressure of 3MPa.

6. The combined sealed ignition nozzle according to claim 1, characterized in that, The glass sealing assembly and the brazing sealing assembly are connected in series. The glass sealing assembly is placed in the combustion chamber and serves as the first seal. When the airtightness of the glass sealing assembly fails, the brazing sealing assembly acts as the second seal, ensuring the efficient sealing of the ignition nozzle.

Images