A ramjet annular gas cylinder and its non-splash electron beam welding method

Abstract

A ramjet annular gas cylinder and its non-spray electron beam welding method, including a first outer half-ring of the gas cylinder, a middle half-ring of the gas cylinder, and a second outer half-ring of the gas cylinder, forming two isolated container inner cavities for storing high-pressure gas respectively, and being applicable to a cylindrical installation structure with limited space, strict quality requirements, and two independent gas release functions. The present invention adopts a specific lock-bottom welding structure form and welding method: an inclined 30° butt joint structure is arranged on the inner side of the gas cylinder and is formed by one-time electron beam welding through "oblique seam and oblique welding", which is different from the method of "vertical seam and oblique shooting" electron beam welding. The advantages are that it not only maintains high welding strength but also prevents the electron beam from penetrating and forming splash residues, solving the problems of complex operation and many splashes on the back of the weld seam in the "vertical seam and oblique shooting" two-time welding. The present invention is applied to the adjustable convergent-divergent nozzle of a ramjet with extremely strict welding quality requirements to realize two actuations of the nozzle.

Description

Technical Field

[0001] The present invention relates to a ramjet annular gas cylinder and a non-spattering electron beam welding method thereof, belonging to the field of welding technology. Background Art

[0002] A ramjet is the main power device of a ballistic cruise missile. Research, design, and manufacture of ramjets are among the cutting-edge scientific and technological fields in the world today. Its gas cylinder is an important component in the cold spray system of missile weapons and is an energy storage element for storing compressed air. The product has a high working pressure and extremely strict quality requirements. The gas cylinder of an adjustable convergent-divergent nozzle in a certain type of ramjet needs to store the high-pressure gas used for the first and second actuations of the nozzle. This adjustable nozzle has a cylindrical installation structure and requires an annular gas cylinder. However, currently, the annular gas cylinder is mainly composed of upper and lower half-ring bodies with the same size welded together, thus defining an annular inner cavity (such as Figure 1 , 2 ), which cannot meet the requirement of storing two parts of gas separately. Therefore, the present invention provides a new annular gas cylinder structure, which is mainly composed of parts such as a first outer half-ring of the gas cylinder, a middle half-ring of the gas cylinder, and a second outer half-ring of the gas cylinder welded together (such as Figure 3 ). This gas cylinder forms two isolated container inner cavities and releases gas separately to achieve the first and second actuations of the nozzle, which is an important development and beneficial supplement to the existing annular gas cylinder.

[0003] In terms of the welding process, the first outer half-ring of the gas cylinder and the second outer half-ring of the gas cylinder are respectively connected to the middle half-ring of the gas cylinder to form a butt joint with a lock bottom structure and are welded by a high-energy electron beam (such as Figure 6 ). Due to the limitations of the gas cylinder structure and the electron beam welding gun, the two inner welds cannot be welded along the butt joint surface. Only the electron beam method of making the beam current at a certain angle to the butt joint surface, that is, the "positive seam oblique shooting" method, can be used to complete the welding. During the product development stage, due to insufficient strength of the inner welds, multiple low-pressure burst problems of gas cylinders occurred during the 60 MPa hydraulic test.

[0004] In order to improve the strength of the inner welds, it is considered to use larger process parameters for "positive seam oblique shooting" welding and weld each weld twice. That is, after welding the first pass, the beam current is offset by a certain distance and then the second pass is welded, such as Figure 11As shown. Although this method can ensure the welding strength, it has complex operations and great difficulty in controlling the offset. In actual production, in order to reduce the risks brought by the theoretical error and operation error of the offset, larger process parameters must be selected for welding to ensure sufficient weld strength. At the same time, since the second weld is a blind weld, that is, it directly offsets on the basis of the first weld, even without considering machining errors and deformations, a large beam current must be used for welding to ensure the weld strength. Based on the above two points, a large amount of spatter is generated on the back of the weld (inside the gas cylinder), and it is easy to fall off and form redundant substances during subsequent knocking and cleaning as well as the charging and discharging process. Moreover, due to the small diameter of the nozzle on the gas cylinder, existing tools cannot enter the internal space of the gas cylinder, making it difficult to effectively remove welding spatter. Summary of the Invention

[0005] The technical problem solved by the present invention is: overcoming the deficiencies of the prior art, providing a ramjet annular gas cylinder and its non-spatter electron beam welding method. The annular gas cylinder can form two isolated inner cavities for storing high-pressure gas, with the characteristics of simple structure, small occupied space, and high reliability. The corresponding lock-bottom welding structure and electron beam welding method solve the problems of low-pressure bursting of the gas cylinder or excessive spatter on the back of the weld.

[0006] The technical solution of the present invention is: a ramjet annular gas cylinder, which is embedded in an adjustable convergent-divergent nozzle through electron beam welding, including a first outer half-ring of the gas cylinder, a middle half-ring of the gas cylinder, a second outer half-ring of the gas cylinder, a first outlet nozzle, and a second outlet nozzle;

[0007] The three half-rings of the gas cylinder are welded to each other in pairs to form two isolated annular inner cavities for storing high-pressure gas respectively; the first outer half-ring of the gas cylinder and the middle half-ring of the gas cylinder form a first inner cavity. When the adjustable convergent-divergent nozzle needs to act for the first time, the high-pressure gas in the first inner cavity flows into the actuation cylinder of the adjustable nozzle through the first outlet nozzle on the middle half-ring of the gas cylinder, and the throat size of the nozzle changes under the action of aerodynamic force; the second outer half-ring of the gas cylinder and the middle half-ring of the gas cylinder form a second inner cavity; when the adjustable convergent-divergent nozzle needs to act for the second time, the high-pressure gas in the second inner cavity flows into the actuation cylinder from the second outlet nozzle on the second outer half-ring of the gas cylinder, prompting the throat size of the nozzle to change again;

[0008] The first outlet nozzle and the second outlet nozzle are welded to the gas cylinder and are respectively connected to the first inner cavity and the second inner cavity of the gas cylinder through the first outlet nozzle and the second outlet nozzle to realize the functions of charging and discharging gas; the first outlet nozzle penetrates through the second outer half-ring of the gas cylinder and is inserted and welded at the countersunk hole on the middle half-ring of the gas cylinder to communicate with the first inner cavity; the second outlet nozzle is welded on the second outer half-ring of the gas cylinder and communicates with the second inner cavity.

[0009] Furthermore, the first inner cavity and the second inner cavity do not communicate with each other.

[0010] Furthermore, the materials of the first outer half-ring of the gas cylinder, the middle half-ring of the gas cylinder, and the second outer half-ring of the gas cylinder are all GH4202 superalloy forgings, and the materials of the outlet nozzles are all GH536 superalloy bars.

[0011] Furthermore, a 30° inclined bottom locking structure is provided on the first outer half-ring of the gas cylinder, the second outer half-ring of the gas cylinder, and the middle half-ring of the gas cylinder.

[0012] Furthermore, the thickness of the bottom locking structure is 1 mm to 1.5 mm.

[0013] Furthermore, the lower end face of the second outlet nozzle is flush with the end face of the second outer half-ring of the gas cylinder.

[0014] A non-spatter electron beam welding method for a ramjet annular gas cylinder as described above includes:

[0015] Machining a 30° inclined bottom locking structure on the first outer half-ring of the gas cylinder, the second outer half-ring of the gas cylinder, and the middle half-ring of the gas cylinder;

[0016] Using manual argon arc welding for the circumferential welds at the first outlet nozzle and the second outlet nozzle of the gas cylinder;

[0017] Assembling the first outer half-ring of the gas cylinder, the second outer half-ring of the gas cylinder and the middle half-ring of the gas cylinder together, and using argon arc welding for tack welding of the circumferential weld on the outside of the gas cylinder;

[0018] Using a high-energy electron beam for inclined seam oblique shooting welding of two circumferential welds on the inside of the gas cylinder;

[0019] Using a high-energy electron beam for welding of two circumferential welds on the outside of the gas cylinder.

[0020] Furthermore, after welding the two circumferential welds on the outside of the gas cylinder, it further includes heat-treating the welded gas cylinder to eliminate the stress between the weld and the welded parts.

[0021] Furthermore, the thickness of the bottom locking structure is 1 mm to 1.5 mm.

[0022] The advantages of the present invention compared with the prior art are as follows:

[0023] (1) The present invention provides a double-chamber annular gas cylinder, which stores two parts of gas separately, has two independent gas release functions, and has the advantages of simple structure, small occupied space, and high reliability;

[0024] (2) The annular gas cylinder is suitable for a cylindrical installation structure, can meet the gas storage requirements of the adjustable convergent-divergent nozzle product of the ramjet engine, and realizes the first actuation and the second actuation of the adjustable nozzle, with strong practicability;

[0025] (3) A 30° inclined butt joint structure is provided inside the gas cylinder. Through one-time electron beam welding of "slanting seam with slanting welding", it can not only have sufficient welding strength to avoid low-pressure bursting of the gas cylinder, but also prevent spatter, solving the problems of the original "vertical seam with slanting shooting" two-time welding, which is complex in operation and has a lot of spatter on the back of the weld seam;

[0026] (4) This non-spatter electron beam welding method is universal and can be popularized and applied to the reliable connection of other inner cavities and similar structures. Adopting this process, the weld quality meets the requirements of Class I in GJB1718A-2005 "Electron Beam Welding", and at the same time, it can avoid redundant substances in the inner cavity and improve the product performance. Brief Description of the Drawings

[0027] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0028] Figure 1 、 2 is a schematic structural diagram of a conventional annular gas cylinder;

[0029] Figure 3 、 4 5 are respectively the top view, sectional view, and partial enlarged view of the welding structure of the annular gas cylinder of the present invention;

[0030] Figure 6 is an assembly drawing of the annular gas cylinder of the present invention in an adjustable expansion and contraction nozzle;

[0031] Figure 7 is an assembly drawing of the outlet nozzle in the annular gas cylinder of the present invention;

[0032] Figure 8 Partial enlarged view of the welding structure of a conventional annular gas cylinder;

[0033] Figure 9 is a schematic structural diagram of the outer half-ring of the annular gas cylinder of the present invention;

[0034] Figure 10 is a schematic structural diagram of the middle half-ring of the annular gas cylinder of the present invention;

[0035] Figure 11 is a schematic diagram of "vertical seam with slanting shooting" of the inner side weld of a conventional gas cylinder;

[0036] Figure 12 is a schematic diagram of "slanting seam with slanting shooting" of the inner side weld of the gas cylinder of the present invention (the lock bottom structure is in the form of 30° inclination);

[0037] Figure 13 is the metallographic diagram of the weld seam after welding of "slanting seam with slanting shooting" in the present invention. Detailed implementation mode

[0038] To better understand the above technical solution, the technical solution of the present application will be described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. Without conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0039] The following further describes in detail a ramjet annular gas cylinder and its non-splash electron beam welding method provided by the embodiments of the present application with reference to the accompanying drawings of the specification. The specific implementation manners may include:

[0040] A new type of annular gas cylinder mainly includes: the first outer half-ring of the gas cylinder, the middle half-ring of the gas cylinder, and the second outer half-ring of the gas cylinder. The materials are all high-temperature alloy GH4202 and are formed by machining forgings. The specific structure is as follows:

[0041] (1) The first outer half-ring of the gas cylinder and the middle half-ring of the gas cylinder form a first inner cavity for storing high-pressure gas. When the adjustable convergent-divergent nozzle needs to act for the first time, the high-pressure gas in the first inner cavity flows into the nozzle actuation cylinder through the outlet nozzle on the middle half-ring of the gas cylinder, and the throat size of the nozzle changes under the action of aerodynamic force;

[0042] (2) The second outer half-ring of the gas cylinder and the middle half-ring of the gas cylinder form a second inner cavity, which is also used to store high-pressure gas, and the first inner cavity and the second inner cavity are not connected to each other. When the adjustable convergent-divergent nozzle needs to act for the second time, the high-pressure gas in the second inner cavity causes the throat size of the nozzle to change again.

[0043] According to another aspect of the present invention, a non-splash electron beam welding method for the above annular gas cylinder is provided. It mainly includes the following steps:

[0044] (1) The groove of the inner ring weld of the gas cylinder is set in an inclined 30° butt joint structure form;

[0045] (2) Assemble the first outer half-ring of the gas cylinder, the second outer half-ring of the gas cylinder and the middle half-ring of the gas cylinder together, and clamp them with a bow-shaped clamp to ensure that the fitting gap is not more than 0.1 mm;

[0046] (3) Use a high-energy electron beam for welding. The beam current of the high-temperature electron beam performs a single-pass welding on the inner side weld of the gas cylinder along the 30° direction, and the required penetration depth is 2-3 mm;

[0047] (4) Use a high-energy electron beam for welding the outer ring weld of the gas cylinder, and the required penetration depth is 2.5-3.5 mm;

[0048] (5) Perform X-ray inspection on the weld of the annular gas cylinder according to the requirements of Class I of GJB1718A-2005;

[0049] (6) Solution heat treatment is carried out on the annular gas cylinder to eliminate the stress of the weld. The heat treatment includes holding at 1120 ± 10 °C for 180 - 190 min;

[0050] (7) Airtight and hydraulic tests are carried out to assess the weld strength. Airtight test: 40 MPa (gauge pressure), 5 min; Hydraulic test: 60 MPa (gauge pressure), 10 min.

[0051] Furthermore, the 90° butt joint groove of the inner ring (such as Figure 11 ) is changed to an inclined butt joint structure form inclined at 30° (such as Figure 12 ), that is, the form of "oblique seam and oblique welding". In this way, the electron beam jet can fuse the weld seam with high quality along the 30° direction at one time.

[0052] Furthermore, the optimal thickness of the lock bottom of the inclined butt joint structure form inclined at 30° is 1 - 1.5 mm. When the thickness of the lock bottom is reduced, there is a risk of spatter on the back of the weld. When the lock bottom thickness is 1 mm or more, semi-penetration welding of the lock bottom can be achieved, which not only ensures the welding strength but also avoids the generation of redundant substances due to full penetration.

[0053] Furthermore, when the high-energy electron beam method is used for welding, the parameters are as follows: acceleration voltage is 60 - 70 KV, welding beam current is 30 - 40 mA, defocusing amount is 300 - 400 mm, focusing current is 2.1 - 2.2 A, and welding speed is 550 - 650 mm / min.

[0054] To verify the optimized 30° inclined lock bottom structure, a strength comparison test is carried out. Two types of die box components with 90° straight opposite sides and 30° inclined opposite sides are processed, and after welding, the two die boxes are subjected to a bursting test. The test results show that the bursting pressures of the two are comparable. After bursting, checking the inner surface of the die box, it is found that there is no spatter in the inner cavity of the die box with inclined opposite sides, and there are local weld beads and many spatters in the straight opposite side structure. Therefore, the welding quality of the 30° inclination is better.

[0055] Using the 30° inclined butt joint structure, one-time electron beam welding is carried out on the inner ring weld of the annular gas cylinder product. The weld quality is qualified, the product meets the requirements of the design technical conditions, passes the airtight and hydraulic tests, and there is no welding spatter in the inner cavity of the gas cylinder.

[0056] In the solution provided in the embodiment of the present application, as shown in Figure 3 , 4 , 5, 9, 10, it includes:

[0057] The first outer half-ring of the gas cylinder, the middle half-ring of the gas cylinder, the second outer half-ring of the gas cylinder, the first outlet nozzle, and the second outlet nozzle. The three half-rings of the gas cylinder are welded pairwise to form two isolated annular inner cavities for storing high-pressure gas respectively. The first outlet nozzle and II are welded on the gas cylinder and are connected to the inner cavity of the gas cylinder through the nozzle to realize the function of gas charging and discharging, asFigure 7 The materials of the half rings of the gas cylinders are all superalloy GH4202, and the materials of the outlet nozzles are all superalloy GH536. Among them, three half rings are formed by machining forgings, and two nozzles are formed by machining bars.

[0058] The first outer half ring of the gas cylinder and the middle half ring of the gas cylinder form a first inner cavity for storing high-pressure gas. When the adjustable convergent-divergent nozzle needs to act for the first time, the high-pressure gas in the first inner cavity flows into the actuator cylinder of the adjustable nozzle through the first outlet nozzle on the middle half ring of the gas cylinder, and the throat size of the nozzle changes under the action of aerodynamic force.

[0059] The second outer half ring of the gas cylinder and the middle half ring of the gas cylinder form a second inner cavity, which is also used for storing high-pressure gas, and the first inner cavity and the second inner cavity are not connected to each other. When the adjustable convergent-divergent nozzle needs to act for the second time, the high-pressure gas in the second inner cavity flows into the actuator cylinder through the second outlet nozzle, prompting the throat size of the nozzle to change again.

[0060] In order to realize the two actions of the adjustable convergent-divergent nozzle of the ramjet engine and meet the two requirements of weld strength and prevention of foreign matters in the inner cavity at the same time, the present application provides a new type of annular gas cylinder and its non-spray electron beam welding method. As Figure 8 , the welding method mainly includes: Step S1, machining a 30° inclined bottom-locking structure on the first outer half ring of the gas cylinder, the second outer half ring of the gas cylinder and the middle half ring of the gas cylinder; Step S2, manually welding the circumferential weld at the first outlet nozzle of the gas cylinder by argon arc welding; Step S3, assembling the first outer half ring of the gas cylinder, the second outer half ring of the gas cylinder and the middle half ring of the gas cylinder together, and performing tack welding on the circumferential weld on the outside of the gas cylinder by argon arc welding; Step S4, performing "oblique seam oblique shooting" welding on the two circumferential welds on the inside of the gas cylinder by high-energy electron beam; Step S5, performing welding on the two circumferential welds on the outside of the gas cylinder by high-energy electron beam.

[0061] After Step S5, the above welding method further includes heat-treating the welded gas cylinder to eliminate the stress between the weld and the welded parts and improve the firmness of the welding.

[0062] In order to further improve the process stability and increase the margin for preventing spatter, the bottom-locking thickness in the 30° inclined bottom-locking structure is 1 mm to 1.5 mm. This can not only ensure the welding strength but also avoid penetration and generation of spatter and other foreign matters.

[0063] Embodiment 1

[0064] (1) According to Figure 9Machine the outer half-ring and Ⅱ structure dimensions of the first gas cylinder. Inner diameter D1 = Φ555mm, with a tolerance of ±0.8mm for D1; D2 = Φ559mm, with a tolerance of 0 to 0.1mm for D2; D3 = Φ561.4mm, with a tolerance of 0 to 0.1mm for D3; D4 = Φ577mm, with a tolerance of ±0.048mm for D4; D5 = Φ595mm, with a tolerance of 0 to 0.1mm for D5; D6 = Φ600mm, with a tolerance of ±0.1mm for D6. Inner cavity R1 = 9mm, R2 = 11mm, R3 = 5mm. Inclined seam lock bottom structure dimensions, θ = 30°, with a tolerance of ±0.05° for θ, lock bottom length δ = 1.6mm, with a tolerance of 0 to 0.1mm for δ;

[0065] (2) According to Figure 10 Machine the structure dimensions of the middle half-ring of the gas cylinder. Inner diameter d1 = Φ555mm, with a tolerance of ±0.8mm for d1; d2 = Φ559mm, with a tolerance of -0.1 to 0mm for d2; d3 = Φ577mm, with a tolerance of ±0.048mm for d3; d4 = Φ592.6mm, with a tolerance of -0.2 to 0mm for d4; d5 = Φ595mm, with a tolerance of -0.1 to 0mm for d5; d6 = Φ600mm, with a tolerance of ±0.1mm for d6. Inclined seam lock bottom structure dimensions, β = 30°, with a tolerance of ±0.05° for β. There is a raised annular rib plate in the middle of the inner side of the middle half-ring structure, whose function is to increase the overall stiffness of the gas cylinder and avoid subsequent welding deformation. Rib plate thickness δ' = 3mm, with a tolerance of 0 to 0.1mm for δ';

[0066] (3) Degrease and pickling the surface of the gas cylinder parts to remove surface oil and dust;

[0067] (4) Insert and assemble the first outlet nozzle of the gas cylinder at the countersunk hole of the middle half-ring of the gas cylinder, then put the second outer half-ring of the gas cylinder over the first outlet nozzle and assemble it with the middle half-ring of the gas cylinder to determine the position of the first outlet nozzle; Use manual argon arc welding for the circumferential welds on both sides of the first outlet nozzle on the middle half-ring of the gas cylinder, with welding wire HGH367, according to the requirements of QJ1842A - 2011 Grade Ⅰ;

[0068] (5) Install the second outlet nozzle on the second outer half-ring of the gas cylinder to ensure that the lower end face of the nozzle is flush with the end face of the second outer half-ring of the gas cylinder; Use manual argon arc welding for the circumferential welds on both sides of the second outlet nozzle on the second outer half-ring of the gas cylinder, with welding wire HGH367, according to the requirements of QJ1842A - 2011 Grade Ⅰ;

[0069] (6) Conduct kerosene inspection on the first outlet nozzle and the weld at Ⅱ, and no leakage is allowed. After inspection, clean the surface with gasoline or alcohol and dry it;

[0070] (7) Assemble the first outer half-ring of the gas cylinder and Ⅱ with the middle half-ring of the gas cylinder, and clamp them with a bow-shaped clamp to ensure that the fitting gap is not more than 0.1 mm;

[0071] (8) Use manual argon arc welding to carry out tack welding on the circumferential weld of the outer side of the gas cylinder, and position 30 - 40 circumferentially;

[0072] (9) Use manual argon arc welding to weld the circumferential weld at the second outer half-ring of the first outlet nozzle of the gas cylinder, with welding wire HGH367, according to the requirements of Class Ⅰ of QJ1842A - 2011;

[0073] (10) Assemble the gas cylinder on the special fixture of the high-energy electron beam welding machine, and the welding equipment used is the GENOVA98 type vacuum electron beam welding machine;

[0074] (11) As Figure 12 、 13 , use high-energy electron beam to carry out "slant seam slant shooting" welding on the two circumferential welds on the inner side of the gas cylinder, according to the Class Ⅰ standard of GJB1718A - 2005, and the penetration depth requirement is 2 - 3 mm. The parameters of electron beam welding are as follows: the accelerating voltage is 60 KV, the welding beam current is 39 ± 3 mA, the defocusing amount is 400 mm, the focusing current is 2.1 - 2.14 A, and the welding speed is 600 mm / min;

[0075] (12) Use high-energy electron beam to weld the two circumferential welds on the outer side of the gas cylinder, according to the Class Ⅰ standard of GJB1718A - 2005, and the penetration depth requirement is 2.5 - 3.5 mm;

[0076] (13) Carry out X-ray inspection on the circumferential weld of the annular gas cylinder, according to the requirements of Class Ⅰ of GJB1718A - 2005;

[0077] (14) Carry out heat treatment on the welded gas cylinder, and the heat treatment includes holding at 1120 ± 10 °C for 180 - 190 min;

[0078] (15) Air tightness test. Apply 40 MPa (gauge pressure) to each of the two cavities of the gas cylinder for 5 min, and check that no bubbles are generated. After the inspection, blow dry the moisture on the surface of the gas cylinder with compressed air;

[0079] (16) Hydrostatic test. Apply 60 MPa (gauge pressure) to each of the two cavities of the gas cylinder for 10 min, and check the structural integrity of the gas cylinder. After the inspection, carry out vacuum drying on the gas cylinder, with a vacuum degree of 0.03 MPa - 0.04 MPa, a drying temperature of 130 - 140 °C, and a drying time of 2 h;

[0080] (17) Excess material blowing test. Carry out inflation and deflation operations on the gas cylinder, and check that no welding spatter is generated.

[0081] Welding is carried out according to the method of this embodiment. The weld quality of the annular gas cylinder meets the requirements of Class I in GJB1718A-2005 "Electron Beam Welding". The welding strength meets the requirements, and there is no welding spatter on the back of the weld. This annular gas cylinder and the welding method have been applied in a certain type of ramjet engine, passed the flight test assessment, meet the gas storage requirements of the adjustable convergent-divergent nozzle product, and realize the first and second actuation of the nozzle.

[0082] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.

[0083] The content not described in detail in the specification of the present invention belongs to the well-known technology of those skilled in the art.

Claims

1. A ramjet annular gas cylinder is embedded in an adjustable convergent-divergent nozzle through electron beam welding, and is characterized in that It includes a first outer half-ring of the gas cylinder, a middle half-ring of the gas cylinder, a second outer half-ring of the gas cylinder, a first outlet nozzle, and a second outlet nozzle; The three half-rings of the gas cylinder are welded to each other pairwise to form two isolated annular inner cavities for storing high-pressure gas respectively; the first outer half-ring of the gas cylinder and the middle half-ring of the gas cylinder form the first inner cavity. When the adjustable convergent-divergent nozzle needs to act for the first time, the high-pressure gas in the first inner cavity flows into the actuation cylinder of the adjustable nozzle through the first outlet nozzle on the middle half-ring of the gas cylinder, and the nozzle realizes the change of the throat size under the action of aerodynamic force; the second outer half-ring of the gas cylinder and the middle half-ring of the gas cylinder form the second inner cavity; when the adjustable convergent-divergent nozzle needs to act for the second time, the high-pressure gas in the second inner cavity flows into the actuation cylinder from the second outlet nozzle on the second outer half-ring of the gas cylinder, prompting the throat size of the nozzle to change again; The first outlet nozzle and the second outlet nozzle are welded and installed on the gas cylinder, and are respectively connected to the first inner cavity and the second inner cavity of the gas cylinder through the first outlet nozzle and the second outlet nozzle to realize the functions of gas charging and discharging; the first outlet nozzle penetrates through the second outer half-ring of the gas cylinder and is inserted and welded at the counterbored hole on the middle half-ring of the gas cylinder, and is connected to the first inner cavity; the second outlet nozzle is welded and installed on the second outer half-ring of the gas cylinder and is connected to the second inner cavity.

2. The annular gas cylinder of a ramjet engine according to claim 1, characterized in that The first inner cavity and the second inner cavity do not communicate with each other.

3. A ramjet annular gas cylinder according to claim 1, characterized in that, The materials of the first outer half-ring of the gas cylinder, the middle half-ring of the gas cylinder, and the second outer half-ring of the gas cylinder are all GH4202 superalloy forgings, and the materials of the outlet nozzles are all GH536 superalloy bars.

4. A ramjet annular gas cylinder according to claim 1, characterized in that, The first outer half-ring of the gas cylinder, the second outer half-ring of the gas cylinder, and the middle half-ring of the gas cylinder are provided with a 30° inclined bottom locking structure.

5. A ramjet annular gas cylinder according to claim 4, characterized in that, The thickness of the bottom locking structure is 1 mm to 1.5 mm.

6. A ramjet annular gas cylinder according to claim 1, wherein, The lower end face of the second outlet nozzle is flush with the end face of the second outer half-ring of the gas cylinder.

7. An electron beam welding method without spatter for a ramjet annular gas cylinder as described in any one of claims 1 to 3, characterized in that, It includes: Processing a 30° inclined bottom locking structure on the first outer half-ring of the gas cylinder, the second outer half-ring of the gas cylinder, and the middle half-ring of the gas cylinder; Using manual argon arc welding for the circumferential welds at the first outlet nozzle and the second outlet nozzle of the gas cylinder; Assembling the first outer half-ring of the gas cylinder, the second outer half-ring of the gas cylinder, and the middle half-ring of the gas cylinder together, and using argon arc welding for tack welding of the circumferential welds on the outside of the gas cylinder; Using high-energy electron beam for the inclined seam oblique shooting welding of the two circumferential welds on the inside of the gas cylinder; Using high-energy electron beam for the welding of the two circumferential welds on the outside of the gas cylinder.

8. The non-splash electron beam welding method according to claim 7, characterized in that, After the welding of the two circumferential welds on the outside of the gas cylinder, it also includes heat treatment of the welded gas cylinder to eliminate the stress between the weld and the welded parts.

9. The non-splash electron beam welding method according to claim 7, characterized in that, The thickness of the bottom locking structure is 1 mm to 1.5 mm.

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