Injector and welding method thereof

Abstract

An injector and a welding method thereof, relating to the technical field of engine injectors. The injector comprises a support part and a cover plate arranged on the front of the support part; a plurality of concentrically distributed annular grooves are arranged on the covering surface of the cover plate, a plurality of annular convex ribs are arranged on the front of the support part and inserted into the annular grooves in a one-to-one correspondence, the plurality of annular convex ribs are concentrically distributed, and the annular convex ribs are fixedly connected with the annular grooves by a diffusion welding process to form a mixing chamber between adjacent annular convex ribs; a plurality of injection holes connected with the mixing chamber are arranged through the cover plate along the thickness direction; a first fuel chamber and a combustion-supporting chamber respectively connected with the mixing chamber are arranged in the support part, the first fuel chamber is used to introduce fuel into the mixing chamber; the combustion-supporting chamber is used to introduce an oxidant into the mixing chamber. The injector has a stable structure and a small change in overall flatness, and the connection strength and sealing of the welded joint are improved by the diffusion welding process, thereby ensuring the dimensional accuracy and shape accuracy of the injector, as well as the safety and reliability of the injector.

Description

Technical Field

[0001] The present invention relates to the technical field of engine injectors, and in particular to an injector and a welding method thereof. Background Art

[0002] The injector of a rocket engine is an important component that sprays fuel and oxidant into the combustion chamber in a certain proportion for full atomization and mixing. Its interior is composed of multiple rings and special-shaped rings, with many welds, and generally uses argon arc welding, brazing and other welding methods.

[0003] However, existing injectors face many problems. Traditional melting welding is limited by space and is plagued by deformation of the injector, making it difficult to meet production needs. During brazing, the overall weld connection area is large and uneven, the local weld width is small, mostly curved, and surrounded by small through holes. The brazing material is prone to block the small holes, resulting in incomplete combustion, reduced specific impulse, and reduced thrust. At the same time, the cover plate of the existing injector is assembled in sequence through multiple independent circular rings, which makes the overall flatness vary greatly, reducing the stability and reliability of the injector. Summary of the invention

[0004] The object of the present invention is to provide an injector and a welding method thereof, which improves the connection strength and sealing of the welded joint through diffusion welding, thereby ensuring the safety and reliability of the injector during operation; at the same time, the base material will not melt during the diffusion welding process, thereby avoiding large deformation caused by the flow of the molten pool and solidification shrinkage, thereby ensuring the dimensional accuracy and shape accuracy of the injector.

[0005] The embodiment of the present invention is achieved as follows:

[0006] According to one aspect of the present invention, there is provided an injector, comprising a support portion and a cover plate arranged on the front side of the support portion; a plurality of concentrically distributed annular grooves are arranged on the covering surface of the cover plate, a plurality of annular ribs are arranged on the front side of the support portion and are inserted into the annular grooves in a one-to-one correspondence, the plurality of annular ribs are concentrically distributed, and the annular ribs are fixedly connected to the annular grooves by a diffusion welding process to form a mixing chamber between adjacent annular ribs; a plurality of injection holes connected to the mixing chamber are arranged through the cover plate along the thickness direction; a first fuel chamber and a combustion-supporting chamber respectively connected to the mixing chamber are arranged in the support portion, the first fuel chamber is used for introducing fuel into the mixing chamber; the combustion-supporting chamber is used for introducing an combustion-supporting agent into the mixing chamber.

[0007] Optionally, at least one side wall of the annular rib is provided with a protrusion, the thickness of the protrusion along the thickness direction of the cover plate is smaller than the thickness of the annular rib along the thickness direction of the cover plate, and the protrusion abuts against the covering surface of the cover plate.

[0008] Optionally, two opposite side walls of the annular rib are provided with protrusions.

[0009] Optionally, the support portion has a central axis extending along the thickness direction of the cover plate, and a plurality of second fuel cavities distributed in a circle with the central axis as the center are arranged in the support portion, and the plurality of second fuel cavities are interconnected at the central axis.

[0010] Optionally, the support portion has a central axis extending in the thickness direction of the cover plate, the first fuel cavity has an opening located on the side wall of the support portion, and an end of the first fuel cavity facing away from the opening has a preset interval with the central axis.

[0011] Optionally, the plurality of injection holes are arranged in a circular pattern, and each circle of injection holes is located between two adjacent annular grooves.

[0012] Optionally, the diameters of the plurality of injection holes gradually increase from inside to outside in the radial direction.

[0013] Another aspect of the present invention provides a welding method for an injector, which is used to prepare an injector, comprising:

[0014] Insert the annular rib of the support part into the annular groove of the cover plate to obtain an assembly part; place the assembly part in a diffusion welding furnace, control the diffusion welding furnace to perform gradient temperature increase while applying pressure, the applied pressure value increases uniformly to a preset pressure value, and perform diffusion welding on the annular rib and the annular groove inserted into each other; after the diffusion welding is completed, reduce the temperature in the diffusion welding furnace to the preset temperature, and remove the pressure to obtain an injector.

[0015] Optionally, placing the assembly in a diffusion welding furnace, controlling the diffusion welding furnace to perform gradient temperature increase while applying pressure, the applied pressure value increases uniformly to a preset pressure value, and performing diffusion welding on the mutually inserted annular ribs and annular grooves includes:

[0016] The temperature in the diffusion soldering furnace is raised to 280-340°C at a heating rate of 5-8°C / min, and kept at this temperature for 50-80 minutes, and pressure is applied to the assembly at the same time, and the pressure value applied increases at a uniform rate; the temperature in the diffusion soldering furnace is further raised to 400-500°C at a heating rate of 5-8°C / min, and kept at this temperature for 20-50 minutes, and pressure is continued to be applied to the assembly at the same time, and the pressure value applied increases at a uniform rate;

[0017] Then continue to raise the temperature in the diffusion welding furnace to 750-850℃ at a heating rate of 2-5℃ / min, keep it warm for 30-70min, and continue to apply pressure to the assembly at the same time, and the applied pressure value increases uniformly to 15-25t;

[0018] Then, the temperature in the diffusion soldering furnace is raised to 920-1000°C at a heating rate of 3-6°C / min, kept at this temperature for 10-40 minutes, and a pressure of 15-25t is applied;

[0019] Finally, the temperature in the diffusion soldering furnace is raised to 1180-1280°C at a heating rate of 5-8°C / min and kept at this temperature for 20-60 minutes.

[0020] Optionally, the annular rib of the support portion is inserted into the annular groove of the cover plate to obtain an assembly part, including: the installation clearance between the annular rib and the annular groove is less than or equal to 0.05mm; and the surface flatness of the assembly part is less than 0.1.

[0021] The beneficial effects of the present invention include at least one of the following:

[0022] The present application provides an injector, comprising a support portion and a cover plate arranged on the front side of the support portion; a plurality of concentrically distributed annular grooves are arranged on the covering surface of the cover plate, and a plurality of annular convex ribs are arranged on the front side of the support portion and are inserted into the annular grooves in a one-to-one correspondence, the plurality of annular convex ribs are concentrically distributed, and the annular convex ribs are fixedly connected to the annular grooves by a diffusion welding process to form a mixing chamber between adjacent annular convex ribs; on the one hand, this concave-convex matching structure can play a good positioning role, and when assembling the support portion and the cover plate, the relative positions of the two can be ensured to be accurate; on the other hand, this mutually interlocking structure increases the contact area of ​​the connection part, and compared with simple plane fitting, the connection is more stable when subjected to external forces such as internal pressure. Diffusion welding can achieve interatomic diffusion bonding at the connection part, and the welded joint has high strength and good sealing. For the injector, good sealing can prevent the fuel and the combustion aid from leaking at the connection, and ensure the reliability of the combustion reaction. The cover plate is provided with a plurality of injection holes connected to the mixing chamber along the thickness direction. The support part is provided with a first fuel chamber and a combustion aid chamber respectively connected to the mixing chamber, and the first fuel chamber is used to introduce fuel into the mixing chamber; the combustion aid chamber is used to introduce the combustion aid into the mixing chamber. The fuel and the combustion aid can be ejected through the injection holes to achieve uniform mixing. The injector has a stable structure and a small change in overall flatness. The diffusion welding process can achieve atomic-level bonding, which is beneficial to improve the connection strength of the welded joint in the welding of the injector. Good sealing can prevent the fuel and the combustion aid from leaking into the cavity, and ensure the safety and reliability of the injector when working. At the same time, during the diffusion welding process, the base material will not melt, avoiding large deformation caused by the flow of the molten pool and solidification shrinkage, and ensuring the dimensional accuracy and shape accuracy of the injector.

[0023] The present application also provides a welding method for an injector, which is used to prepare an injector, comprising:

[0024] The annular convex rib of the support part is inserted into the annular groove of the cover plate to obtain an assembly part. In this way, the support part and the cover plate can be initially positioned and assembled before welding, ensuring the accuracy of the relative position of the two parts; the assembly part is placed in a diffusion welding furnace, and the diffusion welding furnace is controlled to perform gradient heating and pressure at the same time. The applied pressure value increases uniformly to a preset pressure value, and the annular convex rib and the annular groove inserted into each other are diffusion welded; the gradient heating method can avoid excessive thermal stress inside the material due to rapid temperature changes, enable the material to gradually adapt to temperature changes, ensure the stability of the material in a thermal environment, make the welding process smoother, improve the welding quality, and ensure that a good atomic diffusion bond can be formed between the support part and the cover plate; applying pressure during the diffusion welding process helps to make the contact surfaces of the two parts to be welded fit more closely; after the diffusion welding is completed, the temperature in the diffusion welding furnace is reduced to a preset temperature, and the pressure is removed to obtain an injector; slowly reducing the temperature can avoid component damage caused by thermal stress and maintain the integrity and stability of the structure. The pressure is removed after the temperature drops to a preset temperature, such as when it drops to room temperature. During the cooling process, by maintaining the pressure, the metal atoms can be arranged more orderly during the cooling process, reducing defects in the microstructure, such as vacancies and dislocations, thereby extending its service life. The pressure can prevent tiny displacements and deformations caused by thermal expansion and contraction during the cooling process, and ensure that the joint is always in a tight fit during the cooling process. The injector finally obtained in this way can maintain good shape and dimensional accuracy. The above-mentioned welding method of the injector does not require the solder required for traditional welding, greatly reduces labor costs and improves production efficiency. At the same time, it also avoids the undesirable phenomenon of solder overflow causing blockage of the fuel port and through slot of the injector, ensuring the stable operation of the injector under complex working conditions such as high temperature and high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of the structure of an injector provided in an embodiment of the present invention;

[0027] Figure 2 One of the structural schematic diagrams of the cover plate of the injector provided in the embodiment of the present invention;

[0028] Figure 3 A second structural schematic diagram of a cover plate of an injector provided in an embodiment of the present invention;

[0029] Figure 4 This is an enlarged view of the details at A;

[0030] Figure 5 One of the structural schematic diagrams of the support portion of the injector provided in an embodiment of the present invention;

[0031] Figure 6 This is an enlarged view of the details at B;

[0032] Figure 7 A second structural schematic diagram of the support portion of the injector provided in an embodiment of the present invention;

[0033] Figure 8 A schematic cross-sectional view of an injector provided in an embodiment of the present invention;

[0034] Fig. 9 This is an enlarged view of the details at C;

[0035] Fig.10 A schematic flow chart of a welding method for an injector provided in an embodiment of the present invention.

[0036] Icons: 100-injector; 110-supporting part; 111-annular rib; 1111-bump; 112-mixing chamber; 113-first fuel chamber; 114-second fuel chamber; 115-combustion-supporting chamber; 116-opening; 117-fuel port; 120-cover plate; 121-annular groove; 122-injection hole. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0041] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Please refer to Figure 1 , Figure 3 and Figure 5 The present embodiment provides an injector 100, comprising a support portion 110 and a cover plate 120 covering the front side of the support portion 110; a plurality of concentrically distributed annular grooves 121 are provided on the covering surface of the cover plate 120, and a plurality of annular convex ribs 111 are inserted into the annular grooves 121 in a one-to-one correspondence on the front side of the support portion 110, wherein the plurality of annular convex ribs 111 are concentrically distributed, and the annular convex ribs 111 are fixedly connected to the annular grooves 121 by a diffusion welding process to form a mixing chamber 112 between adjacent annular convex ribs 111; a plurality of injection holes 122 communicating with the mixing chamber 112 are penetrated through the cover plate 120 along the thickness direction; a first fuel chamber 113 and a combustion-supporting chamber 115 respectively communicating with the mixing chamber 112 are provided in the support portion 110, and the first fuel chamber 113 is used for introducing fuel into the mixing chamber 112; and the combustion-supporting chamber 115 is used for introducing an oxidant into the mixing chamber 112.

[0044] Specifically, the injector 100 is mainly composed of a support portion 110 and a cover plate 120. Optionally, the support portion 110 is a cylindrical structure, and the cover plate 120 is a circular structure to match the end surface structure of the support portion 110. The support portion 110, as the internal structural support body of the entire injector 100, plays an important role in accommodating, transporting and distributing key substances such as fuel and combustion aid, and at the same time provides the necessary mechanical strength and stability for the entire injector 100, ensuring that it can maintain structural integrity and normal function under various working conditions.

[0045] The cover plate 120 is tightly connected to one side end face of the injector 100, which not only seals and protects the internal structure of the injector 100, but also realizes the process of spraying the fuel and the combustion aid in a specific proportion after mixing, so as to achieve more complete combustion of the fuel and the combustion aid in the combustion chamber and reduce the generation of incomplete combustion products.

[0046] like Figure 2 As shown, the cover plate 120 has a plurality of injection holes 122 penetrating along the thickness direction thereof, and these injection holes 122 can serve as direct channels for mixing the fuel and the combustion improver and then spraying them outward. Preferably, in order to ensure that the fuel and the combustion improver can be sprayed in a uniform, stable and efficient manner, the plurality of injection holes 122 are evenly arranged on the surface of the cover plate 120.

[0047] like Figure 3 and Figure 4 As shown, the cover plate 120 has an annular groove 121 on one side of the surface facing the support portion 110, and correspondingly, as shown in FIG. Figure 5 and Figure 6 As shown, an annular rib 111 with a shape and size that precisely matches the surface of the support portion 110 facing the cover plate 120 is provided. The matching design of the annular groove 121 and the annular rib 111 has multiple advantages. First, during the assembly process, the annular rib 111 can be accurately inserted into the annular groove 121, which plays a role in assembling and positioning the cover plate 120 and the support portion 110, ensuring the relative position accuracy of the support portion 110 and the cover plate 120 during assembly, effectively avoiding problems such as internal channel misalignment, fuel or combustion-aid leakage, etc. that may be caused by assembly errors, and ensuring the stable operation of the subsequent injector 100.

[0048] Secondly, this tight concave-convex matching structure significantly increases the contact area between the support part 110 and the cover plate 120. Compared with a simple plane fitting connection method, it can transfer and disperse stress over a larger area, thereby improving the mechanical strength and stability of the entire connection part. When the injector 100 is subjected to external forces such as pressure, temperature changes and possible vibration of the internal fuel and combustion aid during operation, this strengthened connection structure can better maintain integrity, prevent loosening or separation between components, and ensure the sealing and reliability of the injector 100.

[0049] Preferably, the cover plate 120 is made of copper alloy, and the support portion 110 is made of stainless steel. The diffusion welding process is used to achieve the fixed connection between the support portion 110 and the cover plate 120, which further improves the connection quality between the two. Diffusion welding can make the atoms at the contact interface of the support portion 110 and the cover plate 120 diffuse with each other under high temperature and certain pressure conditions, thereby forming a strong structure. The joint produced by this welding method has extremely high strength and excellent sealing, which can almost eliminate the defects such as pores and cracks that may exist in traditional welding methods, ensure that the fuel and the combustion aid will not leak during the transportation and reaction process inside the injector 100, and provide reliable guarantee for the safe and efficient operation of the injector 100.

[0050] like Figure 5 As shown, a first fuel cavity 113 is radially arranged in the middle of the support portion 110, which can store and transport fuel; Figure 1 As shown, an opening 116 communicating with the outside is provided at one end of the first fuel cavity 113, providing a channel for the fuel to smoothly enter the fuel cavity from the external source. The present application does not impose any restrictions on the size and shape of the opening 116, which can be adjusted according to actual needs to ensure that the fuel can enter the fuel cavity at a suitable flow rate, pressure and flow rate, meet the fuel supply requirements of the injector 100 under different working conditions, and thus ensure the continuous and stable combustion reaction.

[0051] like Figure 5 As shown, a fuel port 117 directly connected to the first fuel cavity 113 is provided on one side of the support portion 110 close to the cover plate 120, and the mixing cavity 112 is connected to the first fuel cavity 113 through the fuel port 117. Under the action of pressure difference or other driving force, the fuel stored in the first fuel cavity 113 overflows to the outside through the fuel port 117 and enters the mixing cavity 112 to contact with the combustion aid. Among them, the parameters such as the size, shape and position of the fuel port 117 are determined by precise calculation according to the needs, aiming to accurately control the overflow speed, flow rate and flow direction of the fuel, so as to ensure that the fuel and the combustion aid are sprayed into the combustion chamber in a certain proportion.

[0052] like Figure 5 and Figure 7As shown, in addition to the above-mentioned fuel cavity and fuel port 117 and other structures, the support portion 110 is also designed with a combustion-supporting cavity 115 along its thickness direction. Preferably, the combustion-supporting cavity 115 is a waist-shaped through hole. The main function of this through hole is to provide a special channel for the entry and transmission of the combustion-supporting agent. The side of the combustion-supporting cavity 115 facing away from the cover plate 120 is connected to the external combustion-supporting agent supply source, and whether it is air, oxygen or other specific combustion-supporting gases or liquids, they can stably enter the injector 100 through this channel. Among them, the cross-sectional shape, size and surface roughness of the combustion-supporting cavity 115 are all determined by precise calculation according to the needs, aiming to accurately control the overflow speed, flow rate and flow direction of the combustion-supporting agent, so as to ensure that the fuel and the combustion-supporting agent are sprayed into the combustion chamber in a certain proportion.

[0053] Under the action of internal pressure, the fuel pre-stored in the first fuel chamber 113 gradually overflows into the mixing chamber 112 inside the injector 100 through the fuel port 117. At the same time, the combustion improver from the combustion chamber 115 also enters the mixing chamber 112 according to a predetermined path and flow rate, so that the fuel and the combustion improver are fully contacted and then ejected. Since the fuel and the combustion improver each have specific chemical properties and reactivity, under certain conditions such as temperature, pressure and mixing ratio, a combustion reaction rapidly occurs between them, releasing a large amount of heat and chemical energy. After being evenly mixed and ejected from the injection hole 122, the fuel and the combustion improver enter the combustion chamber, are ignited by an ignition device in the combustion chamber, and then a combustion reaction occurs to provide a continuous, stable and efficient energy source.

[0054] It should be noted that, in one possible implementation mode of the present application, first, Figure 3 and Figure 4 As shown, there are multiple annular grooves 121, and the multiple annular grooves 121 are concentrically distributed; Figure 5 and Figure 6 As shown, there are multiple annular ribs 111 , and the multiple annular ribs 111 are concentrically distributed to correspond one by one to the multiple annular grooves 121 .

[0055] Specifically, Figure 3 and Figure 4 As shown, a plurality of annular grooves 121 are provided on the side of the cover plate 120 of the injector 100 facing the support portion 110. These annular grooves 121 are concentrically distributed, and the centers of the annular grooves 121 are at the same point. Figure 5 and Figure 6As shown, a plurality of annular ribs 111 are correspondingly provided on the side of the support portion 110 facing the cover plate 120. These annular ribs 111 are also concentrically distributed and precisely correspond to the plurality of annular grooves 121 on the cover plate 120. Each annular rib 111 can be tightly inserted into the corresponding annular groove 121 to form a precise matching relationship.

[0056] This layout has many advantages. First, from the perspective of structural stability, multiple concentric annular grooves 121 can more evenly disperse the stress on the connection between the support portion 110 and the cover plate 120. When the injector 100 is subjected to external forces such as pressure, temperature changes and possible vibrations of the internal fuel and combustion aid during operation, the stress will be dispersed and transmitted through the contact interface of the multiple annular grooves 121 to avoid stress concentration in one place, thereby effectively enhancing the stability and reliability of the entire connection structure and reducing the risk of connection failure or component damage due to excessive local stress.

[0057] Secondly, the concentrically distributed annular grooves 121 help improve the sealing performance. Since the fuel and the combustion aid are under a certain pressure state inside the injector 100, good sealing is essential. The multiple annular grooves 121 are assembled one by one with the multiple annular ribs 111, which greatly reduces the possibility of leakage, ensures that the fuel and the combustion aid can flow and react in the injector 100 according to the predetermined path and method, and ensures the working efficiency and safety of the injector 100.

[0058] In addition, a plurality of concentrically distributed annular ribs 111 and annular grooves 121 can further ensure that the relative positions of the support portion 110 and the cover plate 120 are highly accurate during assembly; in the diffusion welding process, the firmness of the connection can also be greatly enhanced.

[0059] When the existing cover plate is provided with multiple annular grooves, multiple annular copper alloy plates are usually spliced ​​together, and two adjacent annular copper alloy plates are independent of each other; while the present application forms multiple annular grooves 121 on the entire cover plate 120, which can ensure the accuracy of the installation of the cover plate 120, make the overall flatness of the cover plate 120 change little, and ensure the uniformity of the force of the injector 100.

[0060] Second, in one possible implementation of the present application, as Figure 5 As shown, there are multiple first fuel chambers 113 , and the multiple first fuel chambers 113 are arranged in the support portion 110 at intervals along the circumferential direction.

[0061] Specifically, Figure 5As shown, there are multiple first fuel chambers 113 in the support portion 110 structure of the injector 100, and the multiple first fuel chambers 113 are arranged along the circumferential direction of the support portion 110, and a certain spacing distance is maintained between each other. The dispersed arrangement of the multiple first fuel chambers 113 helps to optimize the overall stress condition of the support portion 110. When the injector 100 is subjected to internal pressure and possible external impact force during operation, the multiple first fuel chambers 113 distributed at intervals can disperse these forces more evenly to various parts of the support portion 110, avoiding excessive stress concentration at a certain point, thereby enhancing the structural strength and stability of the support portion 110.

[0062] At the same time, the distribution of the plurality of first fuel chambers 113 along the circumferential direction can increase the storage space and distribution range of the fuel in the support portion 110, so that the fuel can be introduced at different positions, providing more channels and flexibility for the supply of the fuel.

[0063] The present application provides an injector 100, comprising a support portion 110 and a cover plate 120 covering the front side of the support portion 110; a plurality of concentrically distributed annular grooves 121 are provided on the covering surface of the cover plate 120, and a plurality of annular convex ribs 111 are inserted into the annular grooves 121 in a one-to-one correspondence on the front side of the support portion 110, wherein the plurality of annular convex ribs 111 are concentrically distributed, and the annular convex ribs 111 are fixedly connected to the annular grooves 121 by a diffusion welding process to form a mixing chamber 112 between adjacent annular convex ribs 111; on the one hand, such a concave-convex matching structure can play a good positioning role, and when assembling the support portion 110 and the cover plate 120, the relative positions of the two can be ensured to be accurate; on the other hand, such an interlocking structure increases the contact area of ​​the connection part, and compared with a simple plane fitting, the connection is more stable when subjected to external forces such as internal pressure. Diffusion welding can achieve interatomic diffusion bonding at the connection part, and the welded joint has high strength and good sealing. For the injector 100, good sealing can prevent the fuel and the combustion aid from leaking at the connection part; the cover plate 120 is provided with a plurality of injection holes 122 connected with the mixing chamber 112 along the thickness direction; the support part 110 is provided with a first fuel chamber 113 and a combustion aid chamber 115 respectively connected with the mixing chamber 112, and the first fuel chamber 113 is used to pass the fuel into the mixing chamber 112; the combustion aid chamber 115 is used to pass the combustion aid into the mixing chamber 112. The fuel and the combustion aid can be ejected through the injection holes 122 to achieve uniform mixing. The injector 100 has a stable structure and small change in overall flatness, and can achieve atomic-level bonding through the diffusion welding process, which is beneficial to improving the connection strength of the welded joint during the welding of the injector. Good sealing can prevent the fuel and the combustion aid from entering the cavity, thereby ensuring the safety and reliability of the injector during operation. At the same time, during the diffusion welding process, the base material will not melt, thereby avoiding large deformation caused by the flow of the molten pool and solidification shrinkage, thereby ensuring the dimensional accuracy and shape accuracy of the injector.

[0064] For example, Figure 6 and Fig. 9 As shown, at least one side wall of the annular rib 111 is provided with a protrusion 1111, the thickness of the protrusion 1111 along the thickness direction of the cover plate 120 is smaller than the thickness of the annular rib 111 along the thickness direction of the cover plate 120, and the protrusion 1111 abuts against the covering surface of the cover plate 120.

[0065] Specifically, Figure 6 and Fig. 9 As shown, the two side walls of the annular rib 111 on the support portion 110 of the injector 100 protrude outward to form bumps 1111. The presence of the bumps 1111 enhances the overall strength and rigidity of the annular rib 111, reduces the risk of deformation or damage, and thus ensures the stability and reliability of the connection between the support portion 110 and the cover plate 120.

[0066] The length of the protrusion 1111 along the thickness direction of the cover plate 120 is shorter than the length of the annular rib 111 along the thickness direction of the support portion 110, leaving a certain margin for the cooperation between the annular rib 111 and the annular groove 121. When the annular rib 111 is inserted into the annular groove 121, due to the shorter protrusion 1111, the main part of the annular rib 111 can be more deeply embedded in the groove, and the ends of the two protrusions 1111 can abut against the cover plate 120, ensuring a close fit and a good contact area between the two, which is conducive to achieving a more solid connection through processes such as diffusion welding.

[0067] Optionally, two opposite side walls of the annular rib 111 are provided with protrusions 1111 to further improve the abutment stability between the annular rib 111 and the annular groove 121 .

[0068] In one possible implementation of the present application, Figure 5 and Figure 8 As shown, the support portion 110 has a central axis extending along the thickness direction of the cover plate 120, and a plurality of second fuel cavities 114 are arranged in the support portion 110 and distributed in a circumference with the central axis as the center, as shown in FIG. Figure 8 As shown, the plurality of second fuel chambers 114 are interconnected at the central axis.

[0069] Specifically, the second fuel cavity 114 has an opening 116 located at the side edge of the support portion 110 for introducing fuel. The multiple second fuel cavities 114 are interconnected at one end away from the opening 116. When the fuel enters different second fuel cavities 114 from each opening 116, since the second fuel cavities 114 are interconnected, the fuel can flow and exchange freely in these interconnected cavities. This allows the fuel to be automatically and evenly distributed between the second fuel cavities 114, avoiding the situation of uneven fuel distribution caused by pressure fluctuations or flow differences at the entrances of some second fuel cavities 114.

[0070] In addition, when the inlet of a second fuel cavity 114 is partially blocked or fails, resulting in the obstruction of the fuel supply of the fuel cavity, the fuel can flow from other normal second fuel cavities 114 into the obstructed second fuel cavity 114 through interaction with other connected second fuel cavities 114, thereby maintaining the fuel supply of the entire injector 100 and avoiding the injector 100 from completely stopping working due to a local failure. This interconnected design improves the ability of the injector 100 to cope with emergencies to a certain extent, enhances its reliability and stability in actual use, reduces the risk of system failure caused by single point failures, and provides a strong guarantee for the safe and stable operation of the entire device.

[0071] In one possible implementation of the present application, Figure 5 As shown, the support portion 110 has a central axis extending along the thickness direction of the cover plate 120, the first fuel cavity 113 has an opening 116 located on the side wall of the support portion 110, and one end of the first fuel cavity 113 facing away from the opening 116 has a preset interval with the central axis.

[0072] Specifically, by setting the preset interval, the fuel cavity is prevented from being too concentrated near the central axis, so that the internal structure distribution of the support part 110 is more balanced, which helps to optimize the stress condition of the entire support part 110.

[0073] like Figure 5 As shown, at least one combustion-supporting cavity 115 is provided within the preset interval, and the specific number of the combustion-supporting cavities 115 can be adjusted according to the size of the preset interval. Providing such a setting method allows the combustion-supporting agent to be more evenly and smoothly mixed with the fuel overflowing from the second fuel cavity 114 through the fuel port 117 within the space defined by the preset interval, and also makes the internal structure of the injector 100 more compact and orderly, thereby improving the space utilization rate of the support portion 110.

[0074] The combustion-supporting chamber 115 between the two adjacent first fuel chambers 113 and the second fuel chamber 114 allows the combustion-supporting agent to quickly contact and mix with the fuel very close to the fuel overflow position after entering the combustion-supporting chamber 115, thereby greatly improving the mixing efficiency. After being ejected through the injection hole, it is beneficial for the combustion reaction to start and continue more quickly and stably, thereby improving the overall quality of the combustion reaction and the energy release efficiency.

[0075] Alternatively, if Figure 2 and Figure 3 As shown, the plurality of injection holes 122 are arranged in a circle, and each circle of injection holes 122 is located between two adjacent annular grooves 121 .

[0076] Specifically, on the cover plate 120 of the injector 100, a plurality of injection holes 122 are arranged in a circle. When the fuel and the combustion aid are sprayed out from these circularly arranged injection holes 122, a uniform annular jet flow field can be formed outside the injector 100, so that the distribution of the fuel and the combustion aid in space is more uniform and symmetrical, which helps to fully and efficiently mix them with other substances in the external environment.

[0077] At the same time, the circumferentially arranged injection holes 122 are conducive to the uniformity of force on the cover plate 120. Since the existence of the injection holes 122 will affect the strength and rigidity of the cover plate 120 to a certain extent, the circumferential distribution method can disperse the stress generated by the injection holes 122 to the entire circumference, avoiding the concentration of stress in a certain area, thereby ensuring that the cover plate 120 can maintain good structural integrity when subjected to internal pressure and possible external forces, reducing the occurrence of defects such as deformation and cracks caused by uneven force, and extending the service life of the injector 100.

[0078] The position of each circle of injection holes 122 is exactly between two adjacent annular grooves 121, which can avoid interference between the injection holes 122 and the sealing area, ensure that the sealing of the injector 100 is not affected during operation, prevent fuel and combustion aid from leaking from around the injection holes 122, and ensure that the combustion reaction can proceed stably under predetermined conditions.

[0079] Furthermore, the apertures of the plurality of injection holes 122 gradually increase radially from the inside to the outside. Since in the central area of ​​the injector 100, a higher flow rate and pressure are usually required to ensure that the fuel and the combustion aid can overcome the internal pressure resistance, smoothly spray outward, and form a stable core jet flow, and under the condition of a constant flow rate, a smaller aperture will lead to an increase in flow rate. Therefore, when the fuel and the combustion aid are sprayed out from the injection holes 122, the injection holes 122 with a smaller inner aperture can make the fuel and the combustion aid near the central area spray out at a relatively high speed and pressure.

[0080] As the injection hole 122 extends radially outward, the aperture of the injection hole 122 gradually increases, which makes the flow rate of the fuel and the combustion aid gradually decrease and the pressure decrease accordingly during the outward diffusion process. Such a flow rate and pressure change trend is conducive to the fuel and the combustion aid being more evenly dispersed in a larger spatial range after leaving the injector 100. The injection hole 122 with a larger aperture can allow more fuel and the combustion aid to be sprayed out at a relatively low speed on the outside, avoiding the problem that the fuel and the combustion aid are too concentrated in a local area due to high-speed concentrated injection and cannot be fully mixed with the surrounding environment.

[0081] Another aspect of the present invention, as Fig.10 As shown, a welding method of an injector 100 is provided, which is used to prepare the injector 100, and comprises the following steps:

[0082] Step S100, inserting the annular rib 111 of the support portion 110 into the annular groove 121 of the cover plate 120 to obtain an assembly part;

[0083] Specifically, before assembling the support part 110 and the cover plate 120, the stainless steel support part 110 and the copper alloy cover plate 120 need to be cleaned with kerosene. The injection holes 122 on the surface of the cover plate 120 need to be cleaned one by one.

[0084] Before the injector 100 is welded, the support part 110 and the cover plate 120 are first assembled, and the annular rib 111 is gradually inserted into the annular groove 121. As the annular rib 111 goes deeper, the contact area between it and the annular groove 121 gradually increases, and the fit between the two becomes tighter and tighter. This tight fit can not only play a preliminary positioning role, ensuring that the relative position of the support part 110 and the cover plate 120 in space is accurate, preventing displacement or misalignment during subsequent processing and use, but also can increase the stability and sealing of the connection part to a certain extent, laying a good foundation for the subsequent diffusion welding process.

[0085] It should be noted that when the support part 110 and the cover plate 120 are assembled, the installation clearance between the annular rib 111 and the annular groove 121 should be less than or equal to 0.05 mm, so that a tight fit is formed between the annular rib 111 and the annular groove 121, effectively resisting external forces and maintaining the stability of the structure; and the installation clearance is less than or equal to 0.05 mm, which can effectively prevent leakage, ensure that the fuel and the combustion aid flow and react according to a predetermined path inside the injector 100, and improve the efficiency and stability of the combustion reaction.

[0086] At the same time, the surface flatness of the assembly is less than 0.1, thereby ensuring that during diffusion welding, the support part 110 and the cover plate 120 can achieve close and uniform contact, which is conducive to the full diffusion of atoms and the formation of high-quality welded joints, avoiding the occurrence of local high points, the formation of missing welds, and the leakage of fuel and combustion aids, thereby improving the overall reliability and stability of the injector 100.

[0087] Step S200, placing the assembly in a diffusion welding furnace, controlling the diffusion welding furnace to perform gradient temperature increase while applying pressure, the applied pressure value increases uniformly to a preset pressure value, and performing diffusion welding on the mutually inserted annular ribs 111 and annular grooves 121;

[0088] Specifically, after the support part 110 and the cover plate 120 are precisely assembled, the assembly is placed inside a diffusion welding furnace. A diffusion welding furnace is a device that can provide a specific environment and conditions to achieve a diffusion welding process, and its interior usually has functions such as uniform heating, precise temperature control, and stable pressure application. Placing the assembly therein is to create a closed and controllable space for the subsequent welding process, ensuring that the assembly can complete the diffusion bonding between atoms under ideal conditions, thereby supporting the injector 100 with excellent overall performance.

[0089] The diffusion welding process requires high temperature control. In the initial stage, the temperature of the welding furnace is increased at a relatively slow and steady rate to avoid defects such as deformation, warping and even cracks in the assembly parts caused by excessive temperature rise.

[0090] By increasing the temperature in a gradient, each part of the assembly can be gradually and evenly heated and expanded, thereby effectively alleviating the generation of thermal stress. While performing the gradient heating, applying pressure to the assembly is also a key operation in the diffusion welding process. The applied pressure acts on the surface of the assembly, making the contact between the annular rib 111 of the support portion 110 and the annular groove 121 of the cover plate 120 closer. When the two surfaces to be welded are closely fitted, the distance between atoms is significantly shortened, thereby promoting the diffusion movement of atoms. Under the action of pressure, it can ensure that the atomic diffusion process at the welding interface is more uniform and efficient, which helps to form a continuous, dense and high-strength weld joint.

[0091] Under the above-mentioned conditions of gradient temperature increase and pressure application, the atoms inside the assembly begin to undergo a diffusion welding process at the material interface. As the temperature rises and time passes, the atoms in the materials of the support portion 110 and the cover plate 120 gradually penetrate and fuse with each other, and the two originally separated components gradually form a unified whole at the atomic level. This atomic diffusion bonding method can produce a very strong metallurgical connection with excellent sealing performance.

[0092] Compared with existing welding methods such as argon arc welding and brazing, the welding method adopted in the present application does not require the use of solder, thereby reducing production costs; it also avoids solder clogging the holes in the injector 100, thereby ensuring the reliability of the injector 100.

[0093] It should be noted that, in an implementation manner of the present application, step S200 may specifically include the following specific steps:

[0094] First, the temperature in the diffusion welding furnace is raised to 280-340°C at a heating rate of 5-8°C / min and kept at this temperature for 50-80 minutes, with the applied pressure value increasing at a uniform rate;

[0095] Then continue to raise the temperature in the diffusion soldering furnace to 400-500°C at a heating rate of 5-8°C / min, keep it warm for 20-50 minutes, and continue to apply pressure to the assembly at a uniform rate.

[0096] Then continue to raise the temperature in the diffusion welding furnace to 750-850℃ at a heating rate of 2-5℃ / min, keep it warm for 30-70min, and continue to apply pressure to the assembly at the same time. The applied pressure value increases uniformly to 15-25t, at which point the pressure value reaches the maximum;

[0097] Then, the temperature in the diffusion soldering furnace is raised to 920-1000°C at a heating rate of 3-6°C / min, kept at this temperature for 10-40 minutes, and a pressure of 15-25t is applied;

[0098] Finally, the temperature in the diffusion soldering furnace is raised to 1180-1280°C at a heating rate of 5-8°C / min and kept at this temperature for 20-60 minutes.

[0099] Step S300 , after the diffusion welding is completed, the temperature in the diffusion welding furnace is lowered to a preset temperature, and the pressure is removed to obtain the injector 100 .

[0100] Specifically, after a specific time of gradient heating and atomic diffusion process under appropriate pressure, the atoms between the support portion 110 and the cover plate 120 have been fully diffused and formed a strong metallurgical bond. After welding is completed, the temperature in the diffusion welding furnace must be accurately controlled to slowly reduce it to a preset temperature value, so that the injector 100 material has enough time to adapt to the temperature change and evenly release the internal thermal stress, thereby maintaining the stability of its shape and size to the greatest extent. After the temperature is reduced to the preset temperature, the pressure applied to the assembly is removed, and the injector 100 is finally obtained. Preferably, the preset temperature can be selected as room temperature.

[0101] The welding method of the above-mentioned injector 100 does not require the solder required for traditional welding, which greatly reduces labor costs and improves production efficiency. It also avoids undesirable phenomena such as solder overflow leading to blockage of the fuel port 117 and the through groove of the injector 100, thereby ensuring the stable operation of the injector 100 under complex working conditions such as high temperature and high pressure.

[0102] The above description is only an optional embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0103] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

Claims

1. An injector, characterized in that: The invention comprises a support portion (110) and a cover plate (120) arranged on the front side of the support portion (110); a plurality of concentrically distributed annular grooves (121) are provided on the covering surface of the cover plate (120); a plurality of annular convex ribs (111) are inserted into the annular grooves (121) in a one-to-one correspondence on the front side of the support portion (110); the plurality of annular convex ribs (111) are concentrically distributed, and the annular convex ribs (111) are fixedly connected to the annular grooves (121) by a diffusion welding process so as to be connected between adjacent annular grooves. A mixing chamber (112) is formed between the convex ribs (111); the cover plate (120) is provided with a plurality of injection holes (122) in the thickness direction and connected to the mixing chamber (112); a first fuel chamber (113) and a combustion-supporting chamber (115) are provided in the support portion (110), and are respectively connected to the mixing chamber (112); the first fuel chamber (113) is used for introducing fuel into the mixing chamber (112); and the combustion-supporting chamber (115) is used for introducing an oxidant into the mixing chamber (112).

2. The injector according to claim 1, characterized in that At least one side wall of the annular convex rib (111) is provided with a protruding block (1111); the thickness of the protruding block (1111) along the thickness direction of the cover plate (120) is smaller than the thickness of the annular convex rib (111) along the thickness direction of the cover plate (120); the protruding block (1111) abuts against the covering surface of the cover plate (120).

3. The injector according to claim 2, characterized in that The convex blocks (1111) are provided on opposite side walls of the annular convex rib (111).

4. The injector according to claim 1, characterized in that The support portion (110) has a central axis extending in the thickness direction of the cover plate (120), and a plurality of second fuel cavities (114) are also arranged in the support portion (110) and are distributed in a circumference with the central axis as the center. The plurality of second fuel cavities (114) are interconnected at the central axis.

5. The injector according to claim 4, characterized in that The support portion (110) has a central axis extending in the thickness direction of the cover plate (120), the first fuel cavity (113) has an opening (116) located on a side wall of the support portion (110), and an end of the first fuel cavity (113) away from the opening (116) has a preset interval with the central axis.

6. The injector according to claim 1, characterized in that The plurality of injection holes (122) are arranged in a circular pattern, and each circle of the injection holes (122) is located between two adjacent annular grooves (121).

7. The injector according to claim 6, characterized in that The diameters of the plurality of injection holes (122) gradually increase from the inside to the outside in the radial direction.

8. A method for welding an injector, used for preparing the injector (100) according to any one of claims 1 to 7, characterized in that: include: Inserting the annular convex rib (111) of the support portion (110) into the annular groove (121) of the cover plate (120) to obtain an assembly part; Placing the assembly in a diffusion welding furnace, controlling the diffusion welding furnace to perform gradient temperature increase while applying pressure, wherein the applied pressure value increases at a uniform rate to a preset pressure value, and performing diffusion welding on the annular convex rib (111) and the annular groove (121) that are interlocked; After the diffusion welding is completed, the temperature in the diffusion welding furnace is lowered to a preset temperature, and the pressure is removed to obtain the injector (100).

9. The welding method of the injector according to claim 8, characterized in that: Placing the assembly in a diffusion welding furnace, controlling the diffusion welding furnace to perform gradient temperature increase while applying pressure, wherein the applied pressure value increases at a uniform rate to a preset pressure value, and performing diffusion welding on the mutually inserted annular convex rib (111) and the annular groove (121) comprises: The temperature in the diffusion soldering furnace is raised to 280-340° C. at a heating rate of 5-8° C. / min and kept at this temperature for 50-80 minutes, and at the same time, pressure is applied to the assembly, and the pressure value applied increases at a uniform rate; Then, the temperature in the diffusion soldering furnace is continuously raised to 400-500° C. at a heating rate of 5-8° C. / min, and kept at that temperature for 20-50 minutes, while continuously applying pressure to the assembly, and the pressure value applied increases at a uniform rate; Then, the temperature in the diffusion welding furnace is continuously raised to 750-850°C at a heating rate of 2-5°C / min, and kept at this temperature for 30-70 minutes, while pressure is continuously applied to the assembly, and the pressure value is uniformly increased to 15-25t; Then, the temperature in the diffusion welding furnace is raised to 920-1000° C. at a heating rate of 3-6° C. / min, kept at this temperature for 10-40 minutes, and a pressure of 15-25 tons is applied; Finally, the temperature in the diffusion welding furnace is raised to 1180-1280° C. at a heating rate of 5-8° C. / min and kept at this temperature for 20-60 minutes.

10. The welding method of the injector according to claim 8, characterized in that: The method of inserting the annular convex rib (111) of the support portion (110) into the annular groove (121) of the cover plate (120) to obtain an assembly part comprises: The installation clearance between the annular convex rib (111) and the annular groove (121) is less than or equal to 0.05 mm; and the surface flatness of the assembly part is less than 0.1.

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