Connecting device for inner cover and outer cover of afterburning air inlet channel of ramjet

Abstract

According to the connecting device for the inner cover and the outer cover of the afterburning air inlet channel of the ramjet engine, the connecting device is fixed through the circumferential supporting plate, the supporting plate is of a split structure and comprises the supporting plate front section and the supporting plate rear section, the supporting plate structure is installed in a staggered mode, displacement is limited between the inner cover and the outer cover, and the limiting function is achieved. The rear section of the supporting plate and the inner cover are integrally formed, a drainage hole is formed in the center of the supporting plate, and a bolt hole is formed in the rear side of the supporting plate. The front section of the support plate and the outer cover are integrally formed, and a drainage hole and a bolt hole are formed behind the support plate. The split type supporting plate structure is in a willow leaf shape, and each supporting plate and the outer cover are fastened through a radial bolt. And the drainage holes are runway-shaped. The air inlet channel outer cover is connected with the rear section of the supporting plate through a bolt, and the positioning and auxiliary connecting effects are achieved. The air inlet duct is simple in structure and convenient for process realization, the support plate is designed to be in a novel split structure form, and a bolt connection structure is combined, so that the connection strength between the inner cover and the outer cover of the air inlet duct is effectively improved, and the stable connection between the inner cover and the outer cover is ensured.

Description

Technical Field

[0001] This utility model relates to the field of ramjet engine technology, specifically to a connection structure between the inner and outer covers of the ramjet engine's afterburner intake duct. Background Technology

[0002] A rocket ramjet solid rocket motor mainly consists of a combustion chamber, nozzle, safety ignition device, inlet combustion system, and engine components. It uses an inlet duct for inlet combustion, which significantly improves combustion efficiency and specific impulse, thus enhancing engine performance. The inlet duct design is a crucial part of ramjet engine design and a key component for realizing its functions. The engine inlet duct mainly consists of three parts: an inner casing, an outer casing, and a tail casing. The inlet duct is located between the inner and outer casings, and the connecting device between the inner and outer casings is a critical component ensuring the structural integrity of the engine.

[0003] The existing ramjet engine intake manifold inner cover and intake manifold outer cover are mainly connected by an integrated support plate. The support plate is equipped with bolt holes. When the ramjet engine is working, air enters through the intake manifold, and the inner and outer covers are subjected to axial force, which is applied to the support plate on the connecting structure. The main stress-bearing part on the support plate is the bolt connection structure, which has a small stress range and high stress, making it very easy for the bolt structure to break.

[0004] The existing integrated support plate connection has low structural strength and poor connection safety, and is not suitable for the high-pressure working environment of existing ramjet engines. Summary of the Invention

[0005] This utility model provides a connection structure for the inner and outer covers of the ramjet engine's combustion intake duct, which solves the problems of low strength and poor connection safety of the existing integrated support plate connection structure between the inner and outer covers of the ramjet engine's intake duct.

[0006] To solve the above-mentioned technical problems, one of the objectives of this utility model is to provide a connecting device for the inner and outer covers of the combustion intake duct of a ramjet engine. The connecting device is fixed by a circumferential support plate. The support plate adopts a split structure, which is divided into a front section and a rear section. The support plate structure adopts a staggered installation method, and the inner and outer covers restrict each other's displacement, thus playing a limiting function.

[0007] Furthermore, the rear section of the support plate is integrally formed with the inner cover, and there is a drainage hole in the center of the support plate and bolt holes on the rear side of the support plate.

[0008] Furthermore, the front section of the support plate is integrally formed with the outer cover, and the rear section has drainage holes and bolt holes.

[0009] Furthermore, the split support plate structure is willow leaf shaped, and each support plate is fastened to the outer cover by radial bolts.

[0010] Furthermore, the vent hole is configured as a racetrack shape.

[0011] Furthermore, the intake manifold cover and the rear section of the support plate are connected by bolts, which serves as a positioning and auxiliary connection.

[0012] The above-described one or more technical solutions of this utility model have at least one or more of the following technical effects:

[0013] This utility model patent has a simple structure, which is easy to implement. At the same time, the support plate adopts a novel split structure, combined with a bolt connection structure, which effectively improves the connection strength between the inner and outer covers of the intake manifold and ensures a stable connection between the inner and outer covers. In addition, according to simulation verification, the support plate structure has high strength and can adapt to high temperature and high pressure working environment, effectively solving the connection problem between the inner and outer covers of the ramjet engine, and providing a solution for the connection problem of such ramjet engines. Attached Figure Description

[0014] Figure 1 : Schematic diagram of the inner and outer covers of the air intake;

[0015] Figure 2 Schematic diagram of the air intake duct inner cover;

[0016] Figure 3 : Cross-sectional view of the air intake duct inner cover;

[0017] Figure 4 Schematic diagram of the air intake duct cover;

[0018] Figure 5 : Cross-sectional view of the air intake duct cover;

[0019] Figure 6 Schematic diagram of the support plate structure;

[0020] Wherein: 1-front half of the support plate, 2-rear half of the support plate, 3-drain hole, 4-bolt hole, 5-outer cover, 6-inner cover. Detailed Implementation Plan

[0021] This utility model relates to a ramjet engine, mainly concerning the connection structure between the inner and outer casings of the ramjet engine's intake duct. For the ramjet engine's intake duct, it is generally divided into an inner casing, an outer casing, and a tail casing. To ensure the normal operation of the ramjet engine, the connection between the inner and outer casings needs to be stable and reliable, and their relative positions must remain fixed. Therefore, the design of the connection structure between the inner and outer casings is crucial for the normal operation of the ramjet engine.

[0022] This utility model patent provides a novel split-type support plate connection structure, mainly applicable to the connection of the inner and outer covers of the intake manifold in ramjet engines. The split-type support plate connection significantly improves the connection strength between the inner and outer covers. The support plate structure adopts a split design, and to further enhance connection strength, a bolt connection structure is designed at the rear end of the support plate. The combination of these two connection methods further improves the connection strength between the inner and outer covers of the intake manifold. Furthermore, based on the staggered connection method of the split-type support plates, the front and rear support plates are misaligned after installation, limiting the relative displacement between the inner and outer covers and serving a limiting function.

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all of the embodiments obtained. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0024] This utility model discloses a connecting device for the inner and outer covers of the combustion intake duct of a ramjet engine. The connecting device uses a circumferential support plate for fixation. The support plate has a split structure, including a front section and a rear section. The inner and outer covers of the intake duct are installed in a staggered manner using the support plate structure. The support plate structure, combined with the positioning bolts on the rear half of the support plate, restricts the mutual displacement of the inner and outer covers, thus providing a limiting function. The rear section of the support plate is integrally formed with the inner cover. A vent hole is located in the center of the support plate, and bolt holes are located on the rear side of the support plate. The bolts in the bolt holes serve a positioning function and are not subjected to shearing force during engine operation. The front section of the support plate is integrally formed with the outer cover, and has a vent hole and bolt holes at the rear. The split support plate structure is willow-leaf shaped, and each support plate is positioned and fastened to the outer cover by radial bolts. The vent hole is designed as a racetrack shape, allowing the intake air at the front to vent from the rear end of the support plate during engine operation. The outer cover of the intake duct is bolted to the rear section of the support plate, serving a positioning and auxiliary connection function. This utility model patent features a simple structure, facilitating manufacturing. The support plate design employs a novel split-type structure, combined with a bolted connection, effectively enhancing the connection strength between the inner and outer intake manifold covers and ensuring a stable connection. Compared to an integrated support plate, where the main stress point during engine operation is the bolts between the plates, which are susceptible to breakage due to strong shear forces, the split-type support plate primarily bears stress at the connecting surface between the plates. The bolts at the rear mainly serve a positioning function, resulting in a more robust connection.

[0025] Based on the characteristics of the ramjet engine intake duct, and considering the shape and stress characteristics of the inner and outer covers of the ramjet engine intake duct, this utility model designs a support plate structure with stronger connection structure. The support plate structure is mainly used to connect the outer and inner covers of the ramjet engine intake duct. Unlike previous one-piece support plate structures, this utility model adopts a split design. The front half of the support plate is integrally formed with the outer cover, and the rear half is integrally formed with the inner cover. The rear half is designed with oblique flow holes and bolt connection structures. The support plate structure and bolt connection structure are used together for the connection of the inner and outer covers, further improving the structural strength of the support plate connection and enhancing the safety of the inner and outer cover connection operation. In addition, the split support plate connection method, due to its staggered installation, restricts the displacement between the inner and outer covers, thus providing a limiting function.

[0026] The split-type support plate used in this invention has a large stress-bearing area and low stress during the operation of the ramjet engine. The connection structure is relatively stable. The bolted connection structure at the rear end mainly serves for positioning and auxiliary connection, and is subjected to low stress. The bolts at the tail of the split-type support plate are subjected to more circumferential positioning force during operation, avoiding axial shear force.

[0027] The intake duct profile of this engine includes an inner cover profile and an outer cover profile. The inner cover profile is divided into several parts, including a compression section, a throat isolation section, and a diffuser section. The outer cover profile is also divided into several parts, including a compression section, a throat isolation section, and a diffuser section.

[0028] The inner and outer covers of the air intake are connected by a combination of support plates and bolts. The inner and outer covers are installed in a staggered manner using the support plate connection method, which serves both a connection and a limiting function. At the same time, the side bolt connection is used, which serves a positioning and auxiliary connection function, meeting the safety design requirements.

[0029] During assembly, the inner and outer covers are mainly assembled using a staggered installation method. The inner and outer covers are first moved axially to a designated position, and then rotated circumferentially to a designated position. The split support plates are installed and fixed in a staggered manner, and the bolts at the rear end of the support plates are used for positioning and fixing.

[0030] like Figure 1 As shown, the engine intake duct consists of an inner cover and an outer cover. The inner and outer covers are fixed by circumferential support plates, which are of a split structure, with the rear half integrated with the inner cover and the front half integrated with the outer cover. The support plates are willow-leaf shaped, and each support plate is fastened to the outer cover by radial bolts. The compression section of the inner cover is equipped with vent holes, and the intake duct is located at the rear of the combustion chamber, drawing air from the small end of the diffuser section.

[0031] Inner cover diagram as shown Figure 2 As shown, the rear section of the support plate is integrally formed with the inner cover. There is a drainage hole in the center of the support plate, and bolt holes on the rear side of the support plate. A sectional view of the inner cover is shown below. Figure 3As shown in the diagram. Figure 4 As shown, the front section of the support plate is integrally formed with the outer cover, and there are drainage holes and bolt holes at the rear. The sectional view of the outer cover is shown below. Figure 5 As shown. To increase the load-bearing capacity of the inner and outer covers, the support plate adopts a split structure, with the rear half integrally formed with the inner cover. The strength of the support plate was checked according to the engine intake design, and the stress at the joint of the support plate is within the bearing capacity range, meeting the usage requirements. A schematic diagram of the support plate is shown below. Figure 6 As shown. The vent hole is racetrack shaped, and the intake manifold cover is connected to the rear half of the support plate with M6 bolts.

[0032] This invention is intended for application in a testing apparatus, and the test results await verification. Simulation results show that this invention has a complete structure, strong high-pressure resistance, and the split support plate, while fixing the inner and outer covers, also provides a fixing and limiting function due to its staggered installation method. It is suitable for widespread application in the intake structure of ramjet engines.

[0033] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of the embodiments of this utility model. Therefore, if these modifications and variations to the embodiments of this utility model fall within the scope of the claims of this utility model and their equivalents, then this utility model also intends to include these modifications and variations.

Claims

1. A connecting device for the inner and outer covers of the afterburning intake duct of a ramjet engine, characterized in that: The connecting device is fixed with a circumferential support plate. The support plate has a split structure, consisting of a front section and a rear section. The inner and outer covers are installed in a staggered manner through the support plate structure. The staggered installation of the support plate restricts the displacement between the inner and outer covers, thus playing a limiting function.

2. The ramjet engine afterburner intake manifold connecting device according to claim 1, characterized in that: The rear section of the support plate is integrally formed with the inner cover. There is a drainage hole in the center of the support plate and bolt holes on the rear side of the support plate.

3. The connecting device for the inner and outer covers of the ramjet engine afterburner intake duct according to claim 1, characterized in that: The front section of the support plate is integrally formed with the outer cover, and the rear section has drainage holes and bolt holes.

4. The connecting device for the inner and outer covers of the ramjet engine afterburner intake duct according to claim 1, characterized in that: The split structure has a willow leaf-shaped support plate, and each support plate is fastened to the outer cover by radial bolts.

5. The ramjet engine afterburner intake manifold connecting device according to claim 3, characterized in that: The drain hole is designed in the shape of a racetrack.

6. The connecting device for the inner and outer covers of the ramjet engine afterburner intake duct according to claim 1, characterized in that: The bolted connection structure between the inner and outer covers of the air intake plays a role in positioning and auxiliary connection during the assembly of the support plate and the operation of the engine.

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