Vacuum brazing method for impact type thrust chamber injector

Abstract

The invention is suitable for the field of rocket engine production, and provides a vacuum brazing method for an impact type thrust chamber injector, which comprises the following steps: processing a poise-shaped brazing material which is annular; the poise-shaped brazing materials are preset in the corresponding brazing seam positions on the injection shell one by one; an injection shell, an injection ring and a partition plate are assembled; pasty brazing filler metal is smeared in the brazing filler metal reserved groove; and a brazing tool is installed and placed in a vacuum brazing furnace for brazing. According to the method, it is guaranteed that the bottom brazing material is uniform and appropriate in amount, the problems of secondary brazing and brazing material overflowing caused by insufficient brazing material are solved, the consistency and the first-pass yield of products are greatly improved, the improved brazing material preformed groove is simple in structure and has high operability, and the side brazing seam can be effectively filled with the paste brazing material.

Description

Technical Field

[0001] The invention relates to the field of rocket engine production, and in particular to a vacuum brazing method for an impact-type thrust chamber injector. Background Art

[0002] The brazing method of thrust chamber injectors is an important connection process, which is used to firmly connect the various components of the injectors together to ensure the normal operation of the thrust chamber in the rocket engine.

[0003] The existing thrust chamber injector brazing method and brazing material presetting method cannot ensure the brazing gap between the inner and outer sides of the injection ring and the injector shell, and cannot obtain a good filling effect. During the secondary rework, problems such as brazing material accumulation and hole blockage are very likely to occur.

[0004] Therefore, in view of the above situation, it is urgent to develop a vacuum brazing method for impact thrust chamber injectors to overcome the shortcomings in current practical applications. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a vacuum brazing method for an impact-type thrust chamber injector, aiming to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A vacuum brazing method for an impact-type thrust chamber injector, the method comprising:

[0008] Processing of brazing materials;

[0009] Pre-place the brazing materials in the form of foam on the corresponding brazing seam positions on the injection shell one by one;

[0010] Assemble the injection shell, injection ring and partition;

[0011] Apply paste solder to the solder reserved groove;

[0012] Install the brazing tooling and place it in the vacuum brazing furnace for brazing.

[0013] According to a further technical solution, the processed brazing material is in a ring shape.

[0014] According to a further technical solution, both the foam-like brazing material and the smear-like brazing material are made of BNi2 brazing material.

[0015] According to a further technical solution, the soldering material reserved groove is in a slope shape.

[0016] In summary, compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0017] 1. For the bottom brazing seam, by introducing the brazing material in the form of a spherical shape, the brazing material is pre-placed between the injection ring and the injection shell, and between the partition and the injection shell. By controlling the thickness and size of the spherical shape of the brazing material, the amount of the brazing material is strictly controlled to ensure that the bottom brazing material is uniform and appropriate, which fundamentally solves the secondary brazing and brazing material overflow caused by insufficient brazing material, and the consistency and first-time qualified rate of the product are greatly improved;

[0018] 2. For the side brazing seam, after a large number of tests, verifications and analyses, the flow characteristics of BNi brazing material on different materials of the injection shell and injection ring were obtained. By making structural innovations on the brazing material reserved groove on the injection ring, the structure is simple and has high operability after improvement. The paste brazing material can be effectively filled in the side brazing seam to realize the welding of the side brazing seam.

[0019] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic flow chart of a vacuum brazing method for an impact-type thrust chamber injector provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the injector involved in the present invention;

[0022] Figure 3 It is a schematic structural diagram of an annular brazing material adapted to the injector housing in the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of applying a brazing material in a pool shape on a spraying shell according to the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the assembly of the injection shell, the injection ring and the partition in the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the present invention after applying paste solder;

[0026] Figure 7 It is a schematic diagram of the brazing installation of the injector of the present invention;

[0027] Figure 8 It is a schematic diagram of the brazing tooling structure in the injector of the present invention.

[0028] In the figure: 1. injection shell; 2. injection ring; 3. solder paste; 4. solder paste; 5. partition; 6. soldering tool; 7. soldering reserved groove. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0031] like Figure 1-Figure 8 As shown, an embodiment of the present invention relates to a brazing structure of an impact thrust chamber injector, comprising an injection shell 1, an injection ring 2, a partition 5, a brazing tool 6 and a brazing material reserved groove 7, wherein the injection shell 1 is welded with an injection ring 2 on the inner wall of the upper end, and the injection ring 2 is provided with a brazing material reserved groove 7, and the upper end of the injection shell 1 is welded with a partition 5, and the injection shell 1, the injection ring 2 and the partition 5 are spliced ​​and connected with the brazing tool 6, and the brazing tool 6 is formed in an integrated manner, which can effectively press the injection ring 2 and the partition 5, control the free deformation during the brazing process, and ensure the quality and consistency of the product.

[0032] like Figure 1 As shown, the embodiment of the present invention also provides a vacuum brazing method for an impact-type thrust chamber injector, which specifically includes the following steps:

[0033] Step 100: Processing the boulder solder 3;

[0034] like Figure 3 As shown, the brazing material 3 is processed to obtain an annular brazing material 3 that is adapted to the size and shape of the injection shell 1 at the horizontal position.

[0035] Step 110: Figure 4 As shown, the pad-like solder materials 3 are pre-placed one by one at the corresponding soldering seam positions on the injection shell 1;

[0036] Step 120: Assemble the injection shell 1, the injection ring 2 and the partition 5;

[0037] like Figure 2 and Figure 5 As shown, the injection shell 1, the injection ring 2 and the partition 5 are assembled so that the paddy-like solder 3 is respectively located on the contact surfaces between the injection ring 2 and the injection shell 1 and between the partition 5 and the injection shell 1, thereby pre-placing the paddy-like solder 3 at the bottom brazing position.

[0038] Step 130: applying paste solder 4 to the solder reserved groove 7;

[0039] like Figure 6 As shown, a soldering material reserved groove 7 is opened on the injection ring 2, and paste solder 4 is applied to the newly designed soldering material reserved groove 7 so that the soldering material reserved groove 7 is filled with the paste solder 4.

[0040] Step 140: Install the brazing tool 6.

[0041] like Figure 7 As shown, the brazing fixture 6 is installed, and each part of the brazing fixture 6 is pressed tightly against the injection ring 2, and then placed in a vacuum brazing furnace for brazing, thereby completing the vacuum brazing of the impact thrust chamber injector.

[0042] Specifically, Figure 8 As shown, after brazing is completed, a newly designed brazing tool 6 is used to press the injection ring 2 and the partition 5 to ensure the bottom brazing seam gap, prevent free deformation during the brazing process, and ensure product accuracy.

[0043] Understandably, due to the complex structure of the product, Figure 2-Figure 7 All of them use simplified structural diagrams.

[0044] Specifically, the thickness of the billowing solder 3 is less than 0.15mm, which is very difficult to prepare. The present invention realizes the preparation of the annular billowing solder 3 by making a cutting tool. By conducting a large number of experiments, the thickness and size of the solder are determined, and finally the amount of solder is strictly controlled to ensure that the solder is moderate, avoiding overflow and blockage, and at the same time greatly improve the one-time welding pass rate and avoid secondary rework; the original solder reserve groove 7 has a complex structure, poor operability, and great construction difficulty, and does not consider the overflow of the solder on the surfaces of different materials, resulting in serious overflow after brazing, and often blockage and accumulation. The improved solder reserve groove 7 is designed by deeply analyzing the overflow of the solder on the surfaces of different materials, and a sloped solder reserve groove 7 is designed. While simplifying the product structure, it avoids serious overflow and accumulation of the solder to the stainless steel side, reduces the construction difficulty, and significantly improves the work efficiency.

[0045] In the embodiment of the present invention, in the production of the injector, due to the complicated structure of the injector and the large number of brazing seams, the amount of the traditional paste brazing material 4 is difficult to control when applying, and the brazing material is often too much, resulting in serious overflow, and even blocking the injection hole, making the product scrapped, or insufficient brazing seams due to insufficient brazing material, resulting in insufficient filling of the brazing seams, and the quality does not meet the requirements, causing secondary brazing, affecting product performance; and the original brazing material reserved groove 7 has a complicated structure, and the brazing pressing tooling is a split structure, which has poor operability, great construction difficulty, and is difficult to install. Adapt to the production rhythm of batch production; for the bottom brazing seam, the present invention introduces a pond-like brazing material 3, pre-places the pond-like brazing material 3 between the injection ring 2 and the injection shell 1 and between the partition 5 and the injection shell 1, and strictly controls the amount of brazing material by controlling the thickness and size of the pond-like brazing material 3 to ensure that the bottom brazing material is uniform and appropriate, fundamentally solving the secondary brazing and brazing material overflow caused by insufficient brazing material, and greatly improving the consistency and primary qualified rate of the product; for the side brazing seam, after a large number of experimental verification and analysis, the overflow characteristics of BN i2 brazing material on different materials of the injection shell 1 and the injection ring 2 are obtained, and the brazing material reserved groove 7 on the injection ring 2 is structurally innovated. After improvement, the structure is simple and has high operability, and the paste brazing material 4 can be effectively filled in the side brazing seam to realize the welding of the side brazing seam.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum brazing method for an impact thrust chamber injector, characterized in that: The method comprises: Processing the brazing material (3) to obtain a shape that matches the horizontal position, size and shape of the injection shell (1); Pre-placing the foamed brazing materials (3) one by one at corresponding brazing seam positions on the injection shell (1); Assembling the injection shell (1), the injection ring (2) and the partition (5), and spraying the brazing material (3) in a foamed state on the contact surfaces between the injection ring (2) and the injection shell (1) and between the partition (5) and the injection shell (1); Applying paste solder (4) into the solder reserve groove (7); Install the brazing tool (6) and put it into a vacuum brazing furnace for brazing.

2. The vacuum brazing method for impact thrust chamber injector according to claim 1, characterized in that: The processed brazing material (3) is in a ring shape.

3. The vacuum brazing method for impact thrust chamber injector according to claim 1, characterized in that: Both the foam-like solder (3) and the paste-like solder (4) are made of BNi2 solder.

4. The vacuum brazing method for impact thrust chamber injector according to claim 1, characterized in that: The soldering material reserved groove (7) is in a slope shape.

5. The vacuum brazing method for impact thrust chamber injector according to claim 1, characterized in that: The brazing tool (6) is formed in one piece.

6. The vacuum brazing method for impact thrust chamber injector according to claim 1, characterized in that: The thickness of the foamed brazing material (3) is less than 0.15 mm.

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