CN113787305B - Machining method of injector of air heater - Google Patents
Machining method of injector of air heater Download PDFInfo
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- CN113787305B CN113787305B CN202111020619.5A CN202111020619A CN113787305B CN 113787305 B CN113787305 B CN 113787305B CN 202111020619 A CN202111020619 A CN 202111020619A CN 113787305 B CN113787305 B CN 113787305B
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- injector
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- liquid nozzle
- partition plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention relates to a method for processing an injector of an air heater, which comprises the following steps: s1, welding the channel cover plate and the ring cover on the injector cavity in an argon arc welding manner to form a cavity assembly; s2, welding the cavity assembly, the partition board, the liquid nozzle and the air pipe into an injector assembly through vacuum brazing; s3, performing pressure test on the assembled and welded injector assemblies, and executing the step S4 on qualified injector assemblies; s4, spraying paint on the injector assembly which is qualified in the pressure test; and S5, assembling a gas nozzle and a sealing washer on the injector assembly sprayed with the paint to form a qualified injector. The processing method reduces the processing difficulty and the processing cost, the processed product has good quality, and the processing efficiency is effectively improved.
Description
Technical Field
The invention belongs to the technical field of air heaters, and particularly relates to a machining method of an injector of an air heater.
Background
The injector is used as an important component of the air heater and is connected with a combustion chamber of the air heater, and the change of the injection flow and the swirling effect of the tangential holes of the fuel liquid nozzle can directly influence the ignition stability, the combustion efficiency and the change rule of the total temperature uniformity of an outlet of the heater. The jetting flow is in a design range, the jetting effect of the injector is good, the fuel is uniformly atomized, the vibration of flame stabilizing equipment is small, the influence on the service life of the injector is small, when the jetting flow exceeds the design range or the tangential hole swirling effect of the injector is poor, the fuel is not uniformly atomized, the combustion efficiency of the air heater is rapidly reduced, local high temperature is generated due to excessive fuel, the air heater is easy to burn and melt equipment, gas turbulence is caused, namely, the heating equipment is damaged, and the performance of the air heater is seriously influenced. At present, when the air heater injector is machined by adopting the prior art, a forming electrode is used for punching holes when square holes are machined, and the machining cost is high and the machining efficiency is low when the square holes are machined by adopting the machining method, so that the air heater injector is not suitable for batch production. When the liquid nozzle is soldered, the solder is easy to block the flow hole of the liquid nozzle, so that the flow requirement of the flow hole is influenced, the quality of a processed product is poor, and unnecessary loss is caused.
In view of this, how to improve the processing efficiency of the air heater injector and ensure the processing quality is an urgent problem to be solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the processing method of the air heater injector, which reduces the processing difficulty and the processing cost, ensures the processed product to have good quality and effectively improves the processing efficiency.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method of manufacturing an air heater injector, the method comprising the steps of:
s1, welding the channel cover plate and the ring cover on the injector cavity in an argon arc welding manner to form a cavity assembly;
1a, washing and processing a square groove matched with a channel cover plate on an injector cavity by adopting a milling machine, covering the channel cover plate on the square groove, and welding along a contact gap to form a square hole;
1b, sleeving a ring cover on the outer edge of one end of the cavity of the injector, welding along the contact gap, and assembling and welding to form a cavity assembly;
s2, welding the cavity assembly, the partition board, the liquid nozzle and the air pipe into an injector assembly through vacuum brazing;
2a, milling the shape of the partition plate into a plum petal structure by adopting a milling machine, wherein the center of the upper end of each plum petal is provided with an air pipe hole for sleeving an air pipe, and the lower part of each air pipe hole is provided with a plurality of liquid nozzle holes for sleeving liquid nozzles;
2b, arranging a sinking platform on the partition board, wherein the sinking platform is arranged at a position 1.7mm away from the liquid nozzle flow hole;
2c, sleeving a partition plate in an inner cavity at one end of the cavity assembly, which is sleeved with the annular cover, sleeving one ends of a plurality of air pipes in a plurality of air pipe holes in sequence and making the ends flush with the upper end face of the partition plate, and sleeving one ends of a plurality of liquid nozzles in a plurality of liquid nozzle holes in sequence and making the ends flush with the upper end face of the partition plate;
2d, continuously coating paste-shaped brazing filler metal in gaps formed by assembling the partition plate and the cavity assembly, and assembling and welding the liquid nozzle, the air pipe and the partition plate in a furnace to perform brazing so as to form an injector assembly;
s3, performing a pressure test on the assembled and welded injector assemblies, executing the step S4 on qualified injector assemblies, and removing unqualified injector assemblies;
s4, spraying high-temperature-resistant ceramic paint on the injector assembly qualified in the pressure test;
and S5, assembling the gas nozzle and the sealing washer on the injector assembly sprayed with the high-temperature-resistant ceramic coating to form the injector.
Preferably, in step S2, the number of the petals of the plum petals is six, the number of the liquid nozzle holes opened in each of the plum petals is five, and the five liquid nozzle holes are vertically arranged at the lower portion of the air duct hole in two rows.
Preferably, in step S2, the liquid nozzle hole and the gas tube hole formed in the partition board are matched with and marked on a hole in the injector cavity in the machining center.
Preferably, in step S2, the diameter of the opening of the sinking platform is 14mm, and the height is 1 mm.
The invention has the technical effects and advantages that:
1. according to the air heater injector provided by the invention, the partition plate, the air pipe, the liquid nozzle, the gas nozzle, the annular cover and the injector cavity are welded, so that the machining process can be simplified, the machining technical difficulty is reduced, the material cost and the machining cost are saved, the injection flow of the machined injector is stable, the rotational flow and the atomization effect are good, and the performance of the air heater and the heating efficiency of the air heater are improved.
2. According to the processing method of the air heater injector, the square groove is formed in the injector cavity, and the channel cover plate is welded on the square groove in an assembling mode, so that a square hole is formed between the square groove and the channel cover plate, the problem that a runner groove is large in outside and small in inside due to electrode loss is solved, and the problem that the runner groove is large in outside and small in inside due to electrode loss is easily caused; the electrode guide deflection is caused by the rapid loss of the front end of the electrode, so that the deflection of the runner groove and the inner cavity form a step or a radial line, the high-pressure and high-speed fuel forms turbulent flow in the cavity, and the rotational flow and the atomization effect of the fuel liquid nozzle are influenced.
3. According to the processing method of the air heater injector provided by the invention, the distance between the liquid nozzle flow hole and the brazing seam is only 1.7mm, the brazing filler metal is easy to block or shield the liquid flow hole, and the sinking platform is arranged on the partition plate, so that the brazing filler metal can be effectively prevented from blocking or shielding the liquid nozzle flow hole during brazing, and the qualified liquid nozzle is subjected to flow difference or rotational flow difference through grinding and test detection, so that the finished product of the injector is wasted.
Drawings
FIG. 1 is a flow chart of an air heater injector manufacturing method of the present invention;
FIG. 2 is a schematic view of the air heater injector configuration of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a schematic diagram of a channel cover plate welded to an injector cavity according to the present invention;
FIG. 5 is a schematic view of the structure of the present invention in which a sink stand is provided on the injector partition of the air heater.
Reference numbers in the figures: 1. a gas nozzle; 2. a sealing gasket; 3. a partition plate; 4. an injector cavity; 5. a ring cover; 6. an air tube; 7. a liquid nozzle; 8. welding a filler neck; 9. a cavity assembly; 10. an injector assembly; 11. an injector; 41. a channel cover plate; 42. and (4) sinking the platform.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are given in conjunction with the accompanying drawings.
Referring to fig. 1 to 5, a method of manufacturing an air heater injector, the method comprising the steps of:
s1, welding the channel cover plate 41 and the ring cover 5 on the injector cavity 4 in an argon arc welding manner to form a cavity assembly 9;
1a, washing and processing a square groove matched with the channel cover plate 41 on the injector cavity 4 by adopting a milling machine, covering the channel cover plate 41 on the square groove, and welding along a contact gap to form a square hole;
during specific implementation, the square groove is washed and machined on the injector cavity 4, the channel cover plate 41 covers the square groove and is assembled and welded, so that the square groove is prevented from being punched by a forming electrode, machining efficiency can be effectively improved, and machining cost is reduced.
1b, sleeving a ring cover 5 on the outer edge of one end of an injector cavity 4, welding along a contact gap, and assembling and welding to form a cavity assembly 9;
s2, assembling and welding the cavity assembly 9, the partition plate 3, the liquid nozzle 7 and the gas pipe 6 into the injector assembly 10 through vacuum brazing;
2a, milling the shape of the partition plate 3 into a plum petal structure by adopting a milling machine, forming air pipe holes for sleeving air pipes 6 at the centers of the upper ends of all plum petals, and forming a plurality of liquid nozzle holes for sleeving liquid nozzles 7 at the lower parts of all the air pipe holes;
2b, arranging a sinking platform 42 on the partition board 3, wherein the sinking platform 42 is arranged at a position 1.7mm away from the flow hole of the liquid nozzle 7;
in specific implementation, the distance between the flow hole of the liquid nozzle 7 and the brazing seam is only 1.7mm, so that the brazing filler metal can easily block the flow hole, the distance between the flow hole of the liquid nozzle 7 and the brazing seam can be pulled by the aid of the sinking platform 42, the flow hole of the liquid nozzle 7 is prevented from being blocked by the overflow of the brazing filler metal when the liquid nozzle 7 is brazed, and brazing quality is improved.
2c, sleeving the partition plate 3 in an inner cavity at one end of the cavity assembly 9 sleeved with the annular cover 5, sequentially sleeving one ends of the plurality of air pipes 6 in the plurality of air pipe holes and making the ends flush with the upper end face of the partition plate 3, and sequentially sleeving one ends of the plurality of liquid nozzles 7 in the plurality of liquid nozzle holes and making the ends flush with the upper end face of the partition plate 3;
2d, continuously coating paste-shaped brazing filler metal in gaps formed by assembling the partition plate 3 and the cavity assembly 9, and assembling the liquid nozzle 7, the air tube 6 and the partition plate 3, and then, putting the paste-shaped brazing filler metal into a furnace for brazing to form an injector assembly 10 through assembly welding;
s3, performing a pressure test on the assembled and welded injector assemblies 10, executing the step S4 on qualified injector assemblies 10, and rejecting unqualified injector assemblies 10;
s4, spraying high-temperature-resistant ceramic paint on the injector assembly 10 qualified in the pressure test;
s5, assembling the injector assembly 10 sprayed with the high-temperature resistant ceramic coating with the gas nozzle 1 and the sealing washer 2 to form the injector 11.
In step S2, the number of the petals of the plum petals is six, the number of the liquid nozzle holes formed on each petal of the plum petals is five, and the five liquid nozzle holes are vertically arranged at the lower part of the trachea hole in two rows.
In step S2, the liquid nozzle hole and the gas tube hole formed in the partition plate 3 are matched with and marked with the hole in the injector chamber 4 at the machining center.
In specific implementation, holes of the liquid nozzle 7 and the air pipe 6 formed in the partition plate 3 are matched with holes in the injector cavity 4 in a machining center, and marks are made, so that the positions of the holes of the liquid nozzle 7 and the air pipe 6 are matched with the positions of the holes in the injector cavity 4, the assembly difficulty can be reduced, and the brazing seam quality can be improved.
In step S2, the diameter of the opening of the platform 42 is 14mm, and the height thereof is 1 mm.
Examples
By adopting the method shown in fig. 3, a square groove is milled on the injector cavity 4 by adopting a milling mode, and then the channel cover plate 41 is welded on the square groove by adopting argon arc welding so as to form a square hole.
By adopting the method shown in FIG. 4, the sink table 42 is washed and processed on the clapboard 3 by a washing processing mode, the size of the sink table is 14mm in diameter and 1mm in height, and the sink table 42 can enable the liquid flow hole to be far away from the brazing seam and is used for preventing the brazing filler metal from blocking the liquid flow hole during brazing.
The liquid nozzle 7 and the air pipe 6 need to simultaneously penetrate through the holes of the injector cavity 4 and the partition plate 3 to be matched on a machining center, so that the positions of the holes between the injector cavity 4 and the partition plate 3 are the same, the assembling difficulty can be reduced, and the brazing seam quality can be improved.
Welding the ring cover 5 on the injector cavity 4 in an argon arc welding manner to form a cavity assembly 9; assembling the partition plate 3, the liquid nozzle 7 and the gas pipe 6 on the cavity assembly 9, and assembling and welding into an injector assembly 10 in a vacuum brazing mode; performing a pressure test on the assembled and welded injector assemblies 10, spraying paint on the qualified injector assemblies 10, and removing the unqualified injector assemblies 10; the injector assembly 10, with the paint applied, is fitted with a gas nozzle 1 and a sealing gasket 2 to form a qualified injector 11.
By the accurate and unique processing method, the processing difficulty is effectively reduced, the processing cost is low, and the processing efficiency and the processing quality of products are improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (4)
1. A method of manufacturing an air heater injector, the method comprising the steps of:
s1, welding the channel cover plate (41) and the ring cover (5) on the injector cavity (4) in an argon arc welding manner to form a cavity assembly (9);
1a, milling a square groove matched with a channel cover plate (41) on an injector cavity (4) by adopting a milling machine, covering the channel cover plate (41) on the square groove, and welding along a contact gap to form a square hole;
1b, sleeving a ring cover (5) on the outer edge of one end of an injector cavity (4), welding along a contact gap, and assembling and welding to form a cavity assembly (9);
s2, welding the cavity assembly (9), the partition plate (3), the liquid nozzle (7) and the air pipe (6) into an injector assembly (10) through vacuum brazing;
2a, milling the shape of the partition plate (3) into a plum petal structure by adopting a milling machine, forming air pipe holes for sleeving air pipes (6) at the centers of the upper ends of all plum petals, and forming a plurality of liquid nozzle holes for sleeving liquid nozzles (7) at the lower parts of all the air pipe holes;
2b, arranging a sinking platform (42) on the partition board (3), wherein the sinking platform (42) is arranged at a position 1.7mm away from the flow hole of the liquid nozzle (7);
2c, sleeving a partition plate (3) in an inner cavity at one end of a cavity assembly (9) sleeved with a ring cover (5), sequentially sleeving one ends of a plurality of air pipes (6) in the plurality of air pipe holes and leveling with the upper end face of the partition plate (3), and sequentially sleeving one ends of a plurality of liquid nozzles (7) in the plurality of liquid nozzle holes and leveling with the upper end face of the partition plate (3);
2d, continuously coating paste-shaped brazing filler metal in gaps formed by assembling the partition plate (3) and the cavity assembly (9) and assembling the liquid nozzle (7), the air pipe (6) and the partition plate (3), putting the paste-shaped brazing filler metal into a furnace for brazing, and assembling and welding the paste-shaped brazing filler metal into an injector assembly (10);
s3, performing a pressure test on the assembled and welded injector assemblies (10), executing the step S4 on qualified injector assemblies (10), and removing unqualified injector assemblies (10);
s4, spraying high-temperature-resistant ceramic paint on the injector assembly (10) which is qualified in the pressure test;
s5, assembling the gas nozzle (1) and the sealing washer (2) on the injector assembly (10) sprayed with the high-temperature-resistant ceramic coating to form the injector (11).
2. The method of manufacturing an air heater injector as claimed in claim 1, wherein: in step S2, the number of the petals of the plum petals is six, the number of the liquid nozzle holes formed in each petal of the plum petals is five, and the five liquid nozzle holes are vertically arranged at the lower part of the trachea hole in two rows.
3. The method of manufacturing an air heater injector as claimed in claim 1, wherein: in step S2, the liquid nozzle hole and the gas tube hole formed in the partition plate (3) are matched with and marked with the hole in the injector cavity (4) in the machining center.
4. The method of manufacturing an air heater injector as claimed in claim 1, wherein: in step S2, the diameter of the opening of the sinking platform (42) is 14mm, and the height is 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111020619.5A CN113787305B (en) | 2021-09-01 | 2021-09-01 | Machining method of injector of air heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111020619.5A CN113787305B (en) | 2021-09-01 | 2021-09-01 | Machining method of injector of air heater |
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| Publication Number | Publication Date |
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| CN113787305A CN113787305A (en) | 2021-12-14 |
| CN113787305B true CN113787305B (en) | 2022-07-22 |
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Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60226574D1 (en) * | 2001-01-11 | 2008-06-26 | Volvo Aero Corp | PROCESS FOR PREPARING EXHAUST GASES FOR ROCKET ACTUATORS |
| US7596940B2 (en) * | 2005-03-22 | 2009-10-06 | Pratt & Whitney Rocketdyne, Inc. | Rocket engine nozzle and method of fabricating a rocket engine nozzle using pressure brazing |
| CN101782030B (en) * | 2009-01-19 | 2013-03-27 | 北京航空航天大学 | Multiunit coaxial injector component for test and manufacturing method |
| CN104110327A (en) * | 2013-12-02 | 2014-10-22 | 成都绿迪科技有限公司 | Integral injector |
| CN104265507B (en) * | 2014-09-23 | 2016-06-29 | 贵州航天红光机械制造有限公司 | A kind of thrust chamber ejector filler of hydrazine low thrust monopropellant engine |
| CN104874985B (en) * | 2015-06-16 | 2017-06-27 | 湖北三江航天江北机械工程有限公司 | The manufacture method of the porous accurate ejector filler of high temperature alloy |
| WO2017066407A1 (en) * | 2015-10-16 | 2017-04-20 | Nostrum Energy Pte. Ltd. | Method of modifying a conventional direct injector and modified injector assembly |
| CN109798202B (en) * | 2019-04-04 | 2023-08-22 | 北京宇航推进科技有限公司 | Liquid rocket engine injector integrating electric igniter |
| CN110671370A (en) * | 2019-08-17 | 2020-01-10 | 河北欧姆隆机械有限公司 | Atmospheric injector and processing technology thereof |
| CN111412086A (en) * | 2020-05-21 | 2020-07-14 | 安徽九州云箭航天技术有限公司 | Weldless injector for liquid rocket engine |
| CN112427794B (en) * | 2020-11-11 | 2022-07-01 | 上海空间推进研究所 | Full vacuum electron beam welding combined type direct current mutual impact head structure and welding method |
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